[PATCH] gdb/riscv: Add record support for rv64gc instructions

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* [PATCH] gdb/riscv: Add record support for rv64gc instructions
@ 2024-11-15 22:26 Timur
  2024-11-18 19:46 ` Guinevere Larsen
  0 siblings, 1 reply; 2+ messages in thread
From: Timur @ 2024-11-15 22:26 UTC (permalink / raw)
  To: gdb-patches; +Cc: Timur

Timur Golubovich timurgol007@gmail.com
---
 gdb/configure.tgt                             |   4 +-
 gdb/riscv-canonicalize-syscall.c              | 555 ++++++++++++++
 gdb/riscv-linux-tdep.c                        | 261 +++++++
 gdb/riscv-linux-tdep.h                        |  29 +
 gdb/riscv-tdep.c                              | 703 +++++++++++++++++-
 gdb/riscv-tdep.h                              |  15 +
 .../riscv-canonicalize-syscall-gen.py         | 126 ++++
 gdb/testsuite/lib/gdb.exp                     |   3 +-
 8 files changed, 1688 insertions(+), 8 deletions(-)
 create mode 100644 gdb/riscv-canonicalize-syscall.c
 create mode 100644 gdb/riscv-linux-tdep.h
 create mode 100644 gdb/syscalls/riscv-canonicalize-syscall-gen.py

diff --git a/gdb/configure.tgt b/gdb/configure.tgt
index 62df71b13fa..f965e03e84d 100644
--- a/gdb/configure.tgt
+++ b/gdb/configure.tgt
@@ -545,8 +545,8 @@ riscv*-*-freebsd*)
 
 riscv*-*-linux*)
 	# Target: Linux/RISC-V
-	gdb_target_obs="riscv-linux-tdep.o glibc-tdep.o \
- 			linux-tdep.o solib-svr4.o symfile-mem.o linux-record.o"
+	gdb_target_obs="riscv-linux-tdep.o riscv-canonicalize-syscall.o \
+	glibc-tdep.o linux-tdep.o solib-svr4.o symfile-mem.o linux-record.o"
 	;;
 
 riscv*-*-*)
diff --git a/gdb/riscv-canonicalize-syscall.c b/gdb/riscv-canonicalize-syscall.c
new file mode 100644
index 00000000000..779bbd9335c
--- /dev/null
+++ b/gdb/riscv-canonicalize-syscall.c
@@ -0,0 +1,555 @@
+/* DO NOT EDIT: Autogenerated by riscv-canonicalize-syscall-gen.py  */
+
+#include "defs.h"
+#include "riscv-linux-tdep.h"
+
+enum gdb_syscall
+riscv64_canonicalize_syscall (int syscall)
+{
+  switch (syscall)
+    {
+    case 0: // #define __NR_io_setup 0
+      return gdb_sys_io_setup;
+    case 1: // #define __NR_io_destroy 1
+      return gdb_sys_io_destroy;
+    case 2: // #define __NR_io_submit 2
+      return gdb_sys_io_submit;
+    case 3: // #define __NR_io_cancel 3
+      return gdb_sys_io_cancel;
+    case 4: // #define __NR_io_getevents 4
+      return gdb_sys_io_getevents;
+    case 5: // #define __NR_setxattr 5
+      return gdb_sys_setxattr;
+    case 6: // #define __NR_lsetxattr 6
+      return gdb_sys_lsetxattr;
+    case 7: // #define __NR_fsetxattr 7
+      return gdb_sys_fsetxattr;
+    case 8: // #define __NR_getxattr 8
+      return gdb_sys_getxattr;
+    case 9: // #define __NR_lgetxattr 9
+      return gdb_sys_lgetxattr;
+    case 10: // #define __NR_fgetxattr 10
+      return gdb_sys_fgetxattr;
+    case 11: // #define __NR_listxattr 11
+      return gdb_sys_listxattr;
+    case 12: // #define __NR_llistxattr 12
+      return gdb_sys_llistxattr;
+    case 13: // #define __NR_flistxattr 13
+      return gdb_sys_flistxattr;
+    case 14: // #define __NR_removexattr 14
+      return gdb_sys_removexattr;
+    case 15: // #define __NR_lremovexattr 15
+      return gdb_sys_lremovexattr;
+    case 16: // #define __NR_fremovexattr 16
+      return gdb_sys_fremovexattr;
+    case 17: // #define __NR_getcwd 17
+      return gdb_sys_getcwd;
+    case 18: // #define __NR_lookup_dcookie 18
+      return gdb_sys_lookup_dcookie;
+    case 19: // #define __NR_eventfd2 19
+      return gdb_sys_eventfd2;
+    case 20: // #define __NR_epoll_create1 20
+      return gdb_sys_epoll_create1;
+    case 21: // #define __NR_epoll_ctl 21
+      return gdb_sys_epoll_ctl;
+    case 22: // #define __NR_epoll_pwait 22
+      return gdb_sys_epoll_pwait;
+    case 23: // #define __NR_dup 23
+      return gdb_sys_dup;
+    case 24: // #define __NR_dup3 24
+      return gdb_sys_dup3;
+    case 25: // #define __NR_fcntl 25
+      return gdb_sys_fcntl;
+    case 26: // #define __NR_inotify_init1 26
+      return gdb_sys_inotify_init1;
+    case 27: // #define __NR_inotify_add_watch 27
+      return gdb_sys_inotify_add_watch;
+    case 28: // #define __NR_inotify_rm_watch 28
+      return gdb_sys_inotify_rm_watch;
+    case 29: // #define __NR_ioctl 29
+      return gdb_sys_ioctl;
+    case 30: // #define __NR_ioprio_set 30
+      return gdb_sys_ioprio_set;
+    case 31: // #define __NR_ioprio_get 31
+      return gdb_sys_ioprio_get;
+    case 32: // #define __NR_flock 32
+      return gdb_sys_flock;
+    case 33: // #define __NR_mknodat 33
+      return gdb_sys_mknodat;
+    case 34: // #define __NR_mkdirat 34
+      return gdb_sys_mkdirat;
+    case 35: // #define __NR_unlinkat 35
+      return gdb_sys_unlinkat;
+    case 36: // #define __NR_symlinkat 36
+      return gdb_sys_symlinkat;
+    case 37: // #define __NR_linkat 37
+      return gdb_sys_linkat;
+    // case 39: return gdb_sys_umount2;
+    case 40: // #define __NR_mount 40
+      return gdb_sys_mount;
+    case 41: // #define __NR_pivot_root 41
+      return gdb_sys_pivot_root;
+    case 42: // #define __NR_nfsservctl 42
+      return gdb_sys_nfsservctl;
+    case 43: // #define __NR_statfs 43
+      return gdb_sys_statfs;
+    case 44: // #define __NR_fstatfs 44
+      return gdb_sys_fstatfs;
+    case 45: // #define __NR_truncate 45
+      return gdb_sys_truncate;
+    case 46: // #define __NR_ftruncate 46
+      return gdb_sys_ftruncate;
+    case 47: // #define __NR_fallocate 47
+      return gdb_sys_fallocate;
+    case 48: // #define __NR_faccessat 48
+      return gdb_sys_faccessat;
+    case 49: // #define __NR_chdir 49
+      return gdb_sys_chdir;
+    case 50: // #define __NR_fchdir 50
+      return gdb_sys_fchdir;
+    case 51: // #define __NR_chroot 51
+      return gdb_sys_chroot;
+    case 52: // #define __NR_fchmod 52
+      return gdb_sys_fchmod;
+    case 53: // #define __NR_fchmodat 53
+      return gdb_sys_fchmodat;
+    case 54: // #define __NR_fchownat 54
+      return gdb_sys_fchownat;
+    case 55: // #define __NR_fchown 55
+      return gdb_sys_fchown;
+    case 56: // #define __NR_openat 56
+      return gdb_sys_openat;
+    case 57: // #define __NR_close 57
+      return gdb_sys_close;
+    case 58: // #define __NR_vhangup 58
+      return gdb_sys_vhangup;
+    case 59: // #define __NR_pipe2 59
+      return gdb_sys_pipe2;
+    case 60: // #define __NR_quotactl 60
+      return gdb_sys_quotactl;
+    case 61: // #define __NR_getdents64 61
+      return gdb_sys_getdents64;
+    case 62: // #define __NR_lseek 62
+      return gdb_sys_lseek;
+    case 63: // #define __NR_read 63
+      return gdb_sys_read;
+    case 64: // #define __NR_write 64
+      return gdb_sys_write;
+    case 65: // #define __NR_readv 65
+      return gdb_sys_readv;
+    case 66: // #define __NR_writev 66
+      return gdb_sys_writev;
+    case 67: // #define __NR_pread64 67
+      return gdb_sys_pread64;
+    case 68: // #define __NR_pwrite64 68
+      return gdb_sys_pwrite64;
+    // case 69: return gdb_sys_preadv;
+    // case 70: return gdb_sys_pwritev;
+    case 71: // #define __NR_sendfile 71
+      return gdb_sys_sendfile;
+    case 72: // #define __NR_pselect6 72
+      return gdb_sys_pselect6;
+    case 73: // #define __NR_ppoll 73
+      return gdb_sys_ppoll;
+    // case 74: return gdb_sys_signalfd4;
+    case 75: // #define __NR_vmsplice 75
+      return gdb_sys_vmsplice;
+    case 76: // #define __NR_splice 76
+      return gdb_sys_splice;
+    case 77: // #define __NR_tee 77
+      return gdb_sys_tee;
+    case 78: // #define __NR_readlinkat 78
+      return gdb_sys_readlinkat;
+    case 79: // #define __NR_newfstatat 79
+      return gdb_sys_newfstatat;
+    case 80: // #define __NR_fstat 80
+      return gdb_sys_fstat;
+    case 81: // #define __NR_sync 81
+      return gdb_sys_sync;
+    case 82: // #define __NR_fsync 82
+      return gdb_sys_fsync;
+    case 83: // #define __NR_fdatasync 83
+      return gdb_sys_fdatasync;
+    case 84: // #define __NR_sync_file_range 84
+      return gdb_sys_sync_file_range;
+    // case 85: return gdb_sys_timerfd_create;
+    // case 86: return gdb_sys_timerfd_settime;
+    // case 87: return gdb_sys_timerfd_gettime;
+    // case 88: return gdb_sys_utimensat;
+    case 89: // #define __NR_acct 89
+      return gdb_sys_acct;
+    case 90: // #define __NR_capget 90
+      return gdb_sys_capget;
+    case 91: // #define __NR_capset 91
+      return gdb_sys_capset;
+    case 92: // #define __NR_personality 92
+      return gdb_sys_personality;
+    case 93: // #define __NR_exit 93
+      return gdb_sys_exit;
+    case 94: // #define __NR_exit_group 94
+      return gdb_sys_exit_group;
+    case 95: // #define __NR_waitid 95
+      return gdb_sys_waitid;
+    case 96: // #define __NR_set_tid_address 96
+      return gdb_sys_set_tid_address;
+    case 97: // #define __NR_unshare 97
+      return gdb_sys_unshare;
+    case 98: // #define __NR_futex 98
+      return gdb_sys_futex;
+    case 99: // #define __NR_set_robust_list 99
+      return gdb_sys_set_robust_list;
+    case 100: // #define __NR_get_robust_list 100
+      return gdb_sys_get_robust_list;
+    case 101: // #define __NR_nanosleep 101
+      return gdb_sys_nanosleep;
+    case 102: // #define __NR_getitimer 102
+      return gdb_sys_getitimer;
+    case 103: // #define __NR_setitimer 103
+      return gdb_sys_setitimer;
+    case 104: // #define __NR_kexec_load 104
+      return gdb_sys_kexec_load;
+    case 105: // #define __NR_init_module 105
+      return gdb_sys_init_module;
+    case 106: // #define __NR_delete_module 106
+      return gdb_sys_delete_module;
+    case 107: // #define __NR_timer_create 107
+      return gdb_sys_timer_create;
+    case 108: // #define __NR_timer_gettime 108
+      return gdb_sys_timer_gettime;
+    case 109: // #define __NR_timer_getoverrun 109
+      return gdb_sys_timer_getoverrun;
+    case 110: // #define __NR_timer_settime 110
+      return gdb_sys_timer_settime;
+    case 111: // #define __NR_timer_delete 111
+      return gdb_sys_timer_delete;
+    case 112: // #define __NR_clock_settime 112
+      return gdb_sys_clock_settime;
+    case 113: // #define __NR_clock_gettime 113
+      return gdb_sys_clock_gettime;
+    case 114: // #define __NR_clock_getres 114
+      return gdb_sys_clock_getres;
+    case 115: // #define __NR_clock_nanosleep 115
+      return gdb_sys_clock_nanosleep;
+    case 116: // #define __NR_syslog 116
+      return gdb_sys_syslog;
+    case 117: // #define __NR_ptrace 117
+      return gdb_sys_ptrace;
+    case 118: // #define __NR_sched_setparam 118
+      return gdb_sys_sched_setparam;
+    case 119: // #define __NR_sched_setscheduler 119
+      return gdb_sys_sched_setscheduler;
+    case 120: // #define __NR_sched_getscheduler 120
+      return gdb_sys_sched_getscheduler;
+    case 121: // #define __NR_sched_getparam 121
+      return gdb_sys_sched_getparam;
+    case 122: // #define __NR_sched_setaffinity 122
+      return gdb_sys_sched_setaffinity;
+    case 123: // #define __NR_sched_getaffinity 123
+      return gdb_sys_sched_getaffinity;
+    case 124: // #define __NR_sched_yield 124
+      return gdb_sys_sched_yield;
+    case 125: // #define __NR_sched_get_priority_max 125
+      return gdb_sys_sched_get_priority_max;
+    case 126: // #define __NR_sched_get_priority_min 126
+      return gdb_sys_sched_get_priority_min;
+    case 127: // #define __NR_sched_rr_get_interval 127
+      return gdb_sys_sched_rr_get_interval;
+    case 128: // #define __NR_restart_syscall 128
+      return gdb_sys_restart_syscall;
+    case 129: // #define __NR_kill 129
+      return gdb_sys_kill;
+    case 130: // #define __NR_tkill 130
+      return gdb_sys_tkill;
+    case 131: // #define __NR_tgkill 131
+      return gdb_sys_tgkill;
+    case 132: // #define __NR_sigaltstack 132
+      return gdb_sys_sigaltstack;
+    case 133: // #define __NR_rt_sigsuspend 133
+      return gdb_sys_rt_sigsuspend;
+    case 134: // #define __NR_rt_sigaction 134
+      return gdb_sys_rt_sigaction;
+    case 135: // #define __NR_rt_sigprocmask 135
+      return gdb_sys_rt_sigprocmask;
+    case 136: // #define __NR_rt_sigpending 136
+      return gdb_sys_rt_sigpending;
+    case 137: // #define __NR_rt_sigtimedwait 137
+      return gdb_sys_rt_sigtimedwait;
+    case 138: // #define __NR_rt_sigqueueinfo 138
+      return gdb_sys_rt_sigqueueinfo;
+    case 139: // #define __NR_rt_sigreturn 139
+      return gdb_sys_rt_sigreturn;
+    case 140: // #define __NR_setpriority 140
+      return gdb_sys_setpriority;
+    case 141: // #define __NR_getpriority 141
+      return gdb_sys_getpriority;
+    case 142: // #define __NR_reboot 142
+      return gdb_sys_reboot;
+    case 143: // #define __NR_setregid 143
+      return gdb_sys_setregid;
+    case 144: // #define __NR_setgid 144
+      return gdb_sys_setgid;
+    case 145: // #define __NR_setreuid 145
+      return gdb_sys_setreuid;
+    case 146: // #define __NR_setuid 146
+      return gdb_sys_setuid;
+    case 147: // #define __NR_setresuid 147
+      return gdb_sys_setresuid;
+    case 148: // #define __NR_getresuid 148
+      return gdb_sys_getresuid;
+    case 149: // #define __NR_setresgid 149
+      return gdb_sys_setresgid;
+    case 150: // #define __NR_getresgid 150
+      return gdb_sys_getresgid;
+    case 151: // #define __NR_setfsuid 151
+      return gdb_sys_setfsuid;
+    case 152: // #define __NR_setfsgid 152
+      return gdb_sys_setfsgid;
+    case 153: // #define __NR_times 153
+      return gdb_sys_times;
+    case 154: // #define __NR_setpgid 154
+      return gdb_sys_setpgid;
+    case 155: // #define __NR_getpgid 155
+      return gdb_sys_getpgid;
+    case 156: // #define __NR_getsid 156
+      return gdb_sys_getsid;
+    case 157: // #define __NR_setsid 157
+      return gdb_sys_setsid;
+    case 158: // #define __NR_getgroups 158
+      return gdb_sys_getgroups;
+    case 159: // #define __NR_setgroups 159
+      return gdb_sys_setgroups;
+    case 160: // #define __NR_uname 160
+      return gdb_sys_uname;
+    case 161: // #define __NR_sethostname 161
+      return gdb_sys_sethostname;
+    case 162: // #define __NR_setdomainname 162
+      return gdb_sys_setdomainname;
+    case 163: // #define __NR_getrlimit 163
+      return gdb_sys_getrlimit;
+    case 164: // #define __NR_setrlimit 164
+      return gdb_sys_setrlimit;
+    case 165: // #define __NR_getrusage 165
+      return gdb_sys_getrusage;
+    case 166: // #define __NR_umask 166
+      return gdb_sys_umask;
+    case 167: // #define __NR_prctl 167
+      return gdb_sys_prctl;
+    case 168: // #define __NR_getcpu 168
+      return gdb_sys_getcpu;
+    case 169: // #define __NR_gettimeofday 169
+      return gdb_sys_gettimeofday;
+    case 170: // #define __NR_settimeofday 170
+      return gdb_sys_settimeofday;
+    case 171: // #define __NR_adjtimex 171
+      return gdb_sys_adjtimex;
+    case 172: // #define __NR_getpid 172
+      return gdb_sys_getpid;
+    case 173: // #define __NR_getppid 173
+      return gdb_sys_getppid;
+    case 174: // #define __NR_getuid 174
+      return gdb_sys_getuid;
+    case 175: // #define __NR_geteuid 175
+      return gdb_sys_geteuid;
+    case 176: // #define __NR_getgid 176
+      return gdb_sys_getgid;
+    case 177: // #define __NR_getegid 177
+      return gdb_sys_getegid;
+    case 178: // #define __NR_gettid 178
+      return gdb_sys_gettid;
+    case 179: // #define __NR_sysinfo 179
+      return gdb_sys_sysinfo;
+    case 180: // #define __NR_mq_open 180
+      return gdb_sys_mq_open;
+    case 181: // #define __NR_mq_unlink 181
+      return gdb_sys_mq_unlink;
+    case 182: // #define __NR_mq_timedsend 182
+      return gdb_sys_mq_timedsend;
+    case 183: // #define __NR_mq_timedreceive 183
+      return gdb_sys_mq_timedreceive;
+    case 184: // #define __NR_mq_notify 184
+      return gdb_sys_mq_notify;
+    case 185: // #define __NR_mq_getsetattr 185
+      return gdb_sys_mq_getsetattr;
+    case 186: // #define __NR_msgget 186
+      return gdb_sys_msgget;
+    case 187: // #define __NR_msgctl 187
+      return gdb_sys_msgctl;
+    case 188: // #define __NR_msgrcv 188
+      return gdb_sys_msgrcv;
+    case 189: // #define __NR_msgsnd 189
+      return gdb_sys_msgsnd;
+    case 190: // #define __NR_semget 190
+      return gdb_sys_semget;
+    case 191: // #define __NR_semctl 191
+      return gdb_sys_semctl;
+    case 192: // #define __NR_semtimedop 192
+      return gdb_sys_semtimedop;
+    case 193: // #define __NR_semop 193
+      return gdb_sys_semop;
+    case 194: // #define __NR_shmget 194
+      return gdb_sys_shmget;
+    case 195: // #define __NR_shmctl 195
+      return gdb_sys_shmctl;
+    case 196: // #define __NR_shmat 196
+      return gdb_sys_shmat;
+    case 197: // #define __NR_shmdt 197
+      return gdb_sys_shmdt;
+    case 198: // #define __NR_socket 198
+      return gdb_sys_socket;
+    case 199: // #define __NR_socketpair 199
+      return gdb_sys_socketpair;
+    case 200: // #define __NR_bind 200
+      return gdb_sys_bind;
+    case 201: // #define __NR_listen 201
+      return gdb_sys_listen;
+    case 202: // #define __NR_accept 202
+      return gdb_sys_accept;
+    case 203: // #define __NR_connect 203
+      return gdb_sys_connect;
+    case 204: // #define __NR_getsockname 204
+      return gdb_sys_getsockname;
+    case 205: // #define __NR_getpeername 205
+      return gdb_sys_getpeername;
+    case 206: // #define __NR_sendto 206
+      return gdb_sys_sendto;
+    case 207: // #define __NR_recvfrom 207
+      return gdb_sys_recvfrom;
+    case 208: // #define __NR_setsockopt 208
+      return gdb_sys_setsockopt;
+    case 209: // #define __NR_getsockopt 209
+      return gdb_sys_getsockopt;
+    case 210: // #define __NR_shutdown 210
+      return gdb_sys_shutdown;
+    case 211: // #define __NR_sendmsg 211
+      return gdb_sys_sendmsg;
+    case 212: // #define __NR_recvmsg 212
+      return gdb_sys_recvmsg;
+    case 213: // #define __NR_readahead 213
+      return gdb_sys_readahead;
+    case 214: // #define __NR_brk 214
+      return gdb_sys_brk;
+    case 215: // #define __NR_munmap 215
+      return gdb_sys_munmap;
+    case 216: // #define __NR_mremap 216
+      return gdb_sys_mremap;
+    case 217: // #define __NR_add_key 217
+      return gdb_sys_add_key;
+    case 218: // #define __NR_request_key 218
+      return gdb_sys_request_key;
+    case 219: // #define __NR_keyctl 219
+      return gdb_sys_keyctl;
+    case 220: // #define __NR_clone 220
+      return gdb_sys_clone;
+    case 221: // #define __NR_execve 221
+      return gdb_sys_execve;
+    case 222:
+      return gdb_old_mmap;
+    case 223: // #define __NR_fadvise64 223
+      return gdb_sys_fadvise64;
+    case 224: // #define __NR_swapon 224
+      return gdb_sys_swapon;
+    case 225: // #define __NR_swapoff 225
+      return gdb_sys_swapoff;
+    case 226: // #define __NR_mprotect 226
+      return gdb_sys_mprotect;
+    case 227: // #define __NR_msync 227
+      return gdb_sys_msync;
+    case 228: // #define __NR_mlock 228
+      return gdb_sys_mlock;
+    case 229: // #define __NR_munlock 229
+      return gdb_sys_munlock;
+    case 230: // #define __NR_mlockall 230
+      return gdb_sys_mlockall;
+    case 231: // #define __NR_munlockall 231
+      return gdb_sys_munlockall;
+    case 232: // #define __NR_mincore 232
+      return gdb_sys_mincore;
+    case 233: // #define __NR_madvise 233
+      return gdb_sys_madvise;
+    case 234: // #define __NR_remap_file_pages 234
+      return gdb_sys_remap_file_pages;
+    case 235: // #define __NR_mbind 235
+      return gdb_sys_mbind;
+    case 236: // #define __NR_get_mempolicy 236
+      return gdb_sys_get_mempolicy;
+    case 237: // #define __NR_set_mempolicy 237
+      return gdb_sys_set_mempolicy;
+    case 238: // #define __NR_migrate_pages 238
+      return gdb_sys_migrate_pages;
+    case 239: // #define __NR_move_pages 239
+      return gdb_sys_move_pages;
+    // case 240: return gdb_sys_rt_tgsigqueueinfo;
+    // case 241: return gdb_sys_perf_event_open;
+    // case 242: return gdb_sys_accept4;
+    // case 243: return gdb_sys_recvmmsg;
+    // case 258: return gdb_sys_riscv_hwprobe;
+    // case 259: return gdb_sys_riscv_flush_icache;
+    case 260: // #define __NR_wait4 260
+      return gdb_sys_wait4;
+    // case 261: return gdb_sys_prlimit64;
+    // case 262: return gdb_sys_fanotify_init;
+    // case 263: return gdb_sys_fanotify_mark;
+    // case 264: return gdb_sys_name_to_handle_at;
+    // case 265: return gdb_sys_open_by_handle_at;
+    // case 266: return gdb_sys_clock_adjtime;
+    // case 267: return gdb_sys_syncfs;
+    // case 268: return gdb_sys_setns;
+    // case 269: return gdb_sys_sendmmsg;
+    // case 270: return gdb_sys_process_vm_readv;
+    // case 271: return gdb_sys_process_vm_writev;
+    // case 272: return gdb_sys_kcmp;
+    // case 273: return gdb_sys_finit_module;
+    // case 274: return gdb_sys_sched_setattr;
+    // case 275: return gdb_sys_sched_getattr;
+    // case 276: return gdb_sys_renameat2;
+    // case 277: return gdb_sys_seccomp;
+    case 278: // #define __NR_getrandom 278
+      return gdb_sys_getrandom;
+    // case 279: return gdb_sys_memfd_create;
+    // case 280: return gdb_sys_bpf;
+    // case 281: return gdb_sys_execveat;
+    // case 282: return gdb_sys_userfaultfd;
+    // case 283: return gdb_sys_membarrier;
+    // case 284: return gdb_sys_mlock2;
+    // case 285: return gdb_sys_copy_file_range;
+    // case 286: return gdb_sys_preadv2;
+    // case 287: return gdb_sys_pwritev2;
+    // case 288: return gdb_sys_pkey_mprotect;
+    // case 289: return gdb_sys_pkey_alloc;
+    // case 290: return gdb_sys_pkey_free;
+    case 291: // #define __NR_statx 291
+      return gdb_sys_statx;
+    // case 292: return gdb_sys_io_pgetevents;
+    // case 293: return gdb_sys_rseq;
+    // case 294: return gdb_sys_kexec_file_load;
+    // case 424: return gdb_sys_pidfd_send_signal;
+    // case 425: return gdb_sys_io_uring_setup;
+    // case 426: return gdb_sys_io_uring_enter;
+    // case 427: return gdb_sys_io_uring_register;
+    // case 428: return gdb_sys_open_tree;
+    // case 429: return gdb_sys_move_mount;
+    // case 430: return gdb_sys_fsopen;
+    // case 431: return gdb_sys_fsconfig;
+    // case 432: return gdb_sys_fsmount;
+    // case 433: return gdb_sys_fspick;
+    // case 434: return gdb_sys_pidfd_open;
+    // case 435: return gdb_sys_clone3;
+    // case 436: return gdb_sys_close_range;
+    // case 437: return gdb_sys_openat2;
+    // case 438: return gdb_sys_pidfd_getfd;
+    // case 439: return gdb_sys_faccessat2;
+    // case 440: return gdb_sys_process_madvise;
+    // case 441: return gdb_sys_epoll_pwait2;
+    // case 442: return gdb_sys_mount_setattr;
+    // case 443: return gdb_sys_quotactl_fd;
+    // case 444: return gdb_sys_landlock_create_ruleset;
+    // case 445: return gdb_sys_landlock_add_rule;
+    // case 446: return gdb_sys_landlock_restrict_self;
+    // case 447: return gdb_sys_memfd_secret;
+    // case 448: return gdb_sys_process_mrelease;
+    // case 449: return gdb_sys_futex_waitv;
+    // case 450: return gdb_sys_set_mempolicy_home_node;
+    default:
+      return gdb_sys_no_syscall;
+    }
+}
diff --git a/gdb/riscv-linux-tdep.c b/gdb/riscv-linux-tdep.c
index ff478cf4c28..5a56e9911f8 100644
--- a/gdb/riscv-linux-tdep.c
+++ b/gdb/riscv-linux-tdep.c
@@ -25,6 +25,11 @@
 #include "tramp-frame.h"
 #include "trad-frame.h"
 #include "gdbarch.h"
+#include "record-full.h"
+#include "linux-record.h"
+#include "riscv-linux-tdep.h"
+
+extern unsigned int record_debug;
 
 /* The following value is derived from __NR_rt_sigreturn in
    <include/uapi/asm-generic/unistd.h> from the Linux source tree.  */
@@ -173,6 +178,259 @@ riscv_linux_syscall_next_pc (const frame_info_ptr &frame)
   return pc + 4 /* Length of the ECALL insn.  */;
 }
 
+/* RISC-V process record-replay constructs: syscall, signal etc.  */
+
+static linux_record_tdep riscv_linux_record_tdep;
+
+/* Record all registers but PC register for process-record.  */
+
+using regnum_type = int;
+
+static bool
+save_registers (struct regcache *regcache, regnum_type fir, regnum_type last)
+{
+  for (regnum_type i = fir; i != last; ++i)
+    if (record_full_arch_list_add_reg (regcache, i))
+      return false;
+  return true;
+};
+
+static bool
+riscv_all_but_pc_registers_record (struct regcache *regcache)
+{
+  auto &&gdbarch = regcache->arch ();
+  auto &&tdep = gdbarch_tdep<riscv_gdbarch_tdep> (gdbarch);
+  auto &&features = tdep->isa_features;
+
+  if (!save_registers (regcache, RISCV_ZERO_REGNUM + 1, RISCV_PC_REGNUM))
+    return false;
+
+  if (features.flen
+      && !save_registers (regcache, RISCV_FIRST_FP_REGNUM,
+                          RISCV_LAST_FP_REGNUM + 1))
+    return false;
+
+  // TODO: add saving vector registers
+
+  return true;
+}
+
+/* Handler for riscv system call instruction recording.  */
+
+static int
+riscv_linux_syscall_record (struct regcache *regcache,
+                            unsigned long svc_number)
+{
+  auto syscall_gdb = riscv64_canonicalize_syscall (svc_number);
+
+  if (record_debug > 1)
+    {
+      gdb_printf (gdb_stdlog, "Made syscall %s.\n", plongest (svc_number));
+    }
+
+  if (syscall_gdb == gdb_sys_no_syscall)
+    {
+      gdb_printf (gdb_stderr,
+                  _ ("Process record and replay target doesn't "
+                     "support syscall number %s\n"),
+                  plongest (svc_number));
+      return -1;
+    }
+
+  if (syscall_gdb == gdb_sys_sigreturn || syscall_gdb == gdb_sys_rt_sigreturn)
+    {
+      if (!riscv_all_but_pc_registers_record (regcache))
+        return -1;
+      return 0;
+    }
+
+  auto ret = record_linux_system_call (syscall_gdb, regcache,
+                                       &riscv_linux_record_tdep);
+  if (ret != 0)
+    return ret;
+
+  /* Record the return value of the system call.  */
+  if (record_full_arch_list_add_reg (regcache, RISCV_A0_REGNUM))
+    return -1;
+
+  return 0;
+}
+
+/* Initialize the riscv64_linux_record_tdep.  */
+/* These values are the size of the type that will be used in a system
+    call.  They are obtained from Linux Kernel source.  */
+static void
+riscv64_linux_record_tdep_init (
+    struct gdbarch *gdbarch, struct linux_record_tdep &riscv_linux_record_tdep)
+{
+  riscv_linux_record_tdep.size_pointer
+      = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
+  riscv_linux_record_tdep.size__old_kernel_stat
+      = 48; // arch/powerpc/include/uapi/asm/stat.h: 2+2+2+2+2+2+2+2+8+8+8+8
+  riscv_linux_record_tdep.size_tms = 32;
+  riscv_linux_record_tdep.size_loff_t = 8;
+  riscv_linux_record_tdep.size_flock = 32;
+  riscv_linux_record_tdep.size_oldold_utsname
+      = 45; // include/uapi/linux/utsname.h:7:9+9+9+9+9
+  riscv_linux_record_tdep.size_ustat = 32;
+  riscv_linux_record_tdep.size_old_sigaction
+      = 32; // include/linux/signal_types.h:60:8+8+8+8
+  riscv_linux_record_tdep.size_old_sigset_t
+      = 8; // arch/powerpc/include/uapi/asm/signal.h:15
+  riscv_linux_record_tdep.size_rlimit = 16;
+  riscv_linux_record_tdep.size_rusage = 144;
+  riscv_linux_record_tdep.size_timeval = 8; // include/uapi/linux/time.h:17:8+8
+  riscv_linux_record_tdep.size_timezone = 8;
+  riscv_linux_record_tdep.size_old_gid_t
+      = 2; // arch/arm64/include/uapi/asm/posix_types.h:6
+  riscv_linux_record_tdep.size_old_uid_t
+      = 2; // arch/arm64/include/uapi/asm/posix_types.h:5
+  riscv_linux_record_tdep.size_fd_set = 128;
+  riscv_linux_record_tdep.size_old_dirent = 268; //?
+  riscv_linux_record_tdep.size_statfs = 120;
+  riscv_linux_record_tdep.size_statfs64 = 120;
+  riscv_linux_record_tdep.size_sockaddr = 16;
+  riscv_linux_record_tdep.size_int
+      = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
+  riscv_linux_record_tdep.size_long
+      = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
+  riscv_linux_record_tdep.size_ulong
+      = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
+  riscv_linux_record_tdep.size_msghdr = 104;
+  riscv_linux_record_tdep.size_itimerval
+      = 16; // include/uapi/linux/time.h:27:8+8
+  riscv_linux_record_tdep.size_stat = 128;
+  riscv_linux_record_tdep.size_old_utsname
+      = 325; // include/uapi/linux/utsname.h:17:65+65+65+65+65
+  riscv_linux_record_tdep.size_sysinfo = 112;
+  riscv_linux_record_tdep.size_msqid_ds = 104;
+  riscv_linux_record_tdep.size_shmid_ds = 88;
+  riscv_linux_record_tdep.size_new_utsname = 390;
+  riscv_linux_record_tdep.size_timex
+      = 188; // include/uapi/linux/timex.h:65:4+8+8+8+8+4+8+8+8+8+8+8+8+4+8+8+8+8+8+4+11*4
+  riscv_linux_record_tdep.size_mem_dqinfo = 72;
+  riscv_linux_record_tdep.size_if_dqblk
+      = 68; // include/uapi/linux/quota.h:111:8*8+4
+  riscv_linux_record_tdep.size_fs_quota_stat
+      = 64; // include/uapi/linux/dqblk_xfs.h:165:1+2+1+20+20+4+4+4+4+2+2
+  riscv_linux_record_tdep.size_timespec
+      = 16; // include/uapi/linux/time.h:11:8+8
+  riscv_linux_record_tdep.size_pollfd = 8;
+  riscv_linux_record_tdep.size_NFS_FHSIZE = 32; // include/uapi/linux/nfs.h:20
+  riscv_linux_record_tdep.size_knfsd_fh = 36;   // fs/nfsd/nfsfh.h:47:4+32
+  riscv_linux_record_tdep.size_TASK_COMM_LEN = 4;
+  riscv_linux_record_tdep.size_sigaction = 24;
+  riscv_linux_record_tdep.size_sigset_t = 8;
+  riscv_linux_record_tdep.size_siginfo_t = 128;
+  riscv_linux_record_tdep.size_cap_user_data_t = 8;
+  riscv_linux_record_tdep.size_stack_t = 24;
+  riscv_linux_record_tdep.size_off_t = riscv_linux_record_tdep.size_long;
+  riscv_linux_record_tdep.size_stat64
+      = 136; // include/uapi/asm-generic/stat.h:49:8+8+4+4+4+4+8+8+8+4+4+8+4+4+4+4+4+4+4+4
+  riscv_linux_record_tdep.size_gid_t = 4;
+  riscv_linux_record_tdep.size_uid_t = 4;
+  riscv_linux_record_tdep.size_PAGE_SIZE = 4096;
+  riscv_linux_record_tdep.size_flock64 = 32;
+  riscv_linux_record_tdep.size_user_desc
+      = 37; // arch/x86/include/uapi/asm/ldt.h:21:4*9+1
+  riscv_linux_record_tdep.size_io_event = 32;
+  riscv_linux_record_tdep.size_iocb = 64;
+  riscv_linux_record_tdep.size_epoll_event = 16;
+  riscv_linux_record_tdep.size_itimerspec
+      = riscv_linux_record_tdep.size_timespec * 2;
+  riscv_linux_record_tdep.size_mq_attr = 64;
+  riscv_linux_record_tdep.size_termios = 36;
+  riscv_linux_record_tdep.size_termios2 = 44;
+  riscv_linux_record_tdep.size_pid_t = 4;
+  riscv_linux_record_tdep.size_winsize = 8;
+  riscv_linux_record_tdep.size_serial_struct = 72;
+  riscv_linux_record_tdep.size_serial_icounter_struct = 80;
+  riscv_linux_record_tdep.size_hayes_esp_config = 12;
+  riscv_linux_record_tdep.size_size_t = 8;
+  riscv_linux_record_tdep.size_iovec = 16;
+  riscv_linux_record_tdep.size_time_t = 8; // tools/include/nolibc/std.h:34
+
+  riscv_linux_record_tdep.ioctl_TCGETS = 0x5401;
+  riscv_linux_record_tdep.ioctl_TCSETS = 0x5402;
+  riscv_linux_record_tdep.ioctl_TCSETSW = 0x5403;
+  riscv_linux_record_tdep.ioctl_TCSETSF = 0x5404;
+  riscv_linux_record_tdep.ioctl_TCGETA = 0x5405;
+  riscv_linux_record_tdep.ioctl_TCSETA = 0x5406;
+  riscv_linux_record_tdep.ioctl_TCSETAW = 0x5407;
+  riscv_linux_record_tdep.ioctl_TCSETAF = 0x5408;
+  riscv_linux_record_tdep.ioctl_TCSBRK = 0x5409;
+  riscv_linux_record_tdep.ioctl_TCXONC = 0x540a;
+  riscv_linux_record_tdep.ioctl_TCFLSH = 0x540b;
+  riscv_linux_record_tdep.ioctl_TIOCEXCL = 0x540c;
+  riscv_linux_record_tdep.ioctl_TIOCNXCL = 0x540d;
+  riscv_linux_record_tdep.ioctl_TIOCSCTTY = 0x540e;
+  riscv_linux_record_tdep.ioctl_TIOCGPGRP = 0x540f;
+  riscv_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
+  riscv_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
+  riscv_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
+  riscv_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
+  riscv_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
+  riscv_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
+  riscv_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
+  riscv_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
+  riscv_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
+  riscv_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
+  riscv_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541a;
+  riscv_linux_record_tdep.ioctl_FIONREAD = 0x541b;
+  riscv_linux_record_tdep.ioctl_TIOCINQ
+      = riscv_linux_record_tdep.ioctl_FIONREAD;
+  riscv_linux_record_tdep.ioctl_TIOCLINUX = 0x541c;
+  riscv_linux_record_tdep.ioctl_TIOCCONS = 0x541d;
+  riscv_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541e;
+  riscv_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541f;
+  riscv_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
+  riscv_linux_record_tdep.ioctl_FIONBIO = 0x5421;
+  riscv_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
+  riscv_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
+  riscv_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
+  riscv_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
+  riscv_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
+  riscv_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
+  riscv_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
+  riscv_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
+  riscv_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
+  riscv_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
+  riscv_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
+  riscv_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
+  riscv_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
+  riscv_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
+  riscv_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
+  riscv_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
+  riscv_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
+  riscv_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
+  riscv_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
+  riscv_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
+  riscv_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
+  riscv_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
+  riscv_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
+  riscv_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
+  riscv_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545a;
+  riscv_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545b;
+  riscv_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545c;
+  riscv_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545d;
+  riscv_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545e;
+  riscv_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545f;
+  riscv_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
+
+  riscv_linux_record_tdep.fcntl_F_GETLK = 5;
+  riscv_linux_record_tdep.fcntl_F_GETLK64 = 12;
+  riscv_linux_record_tdep.fcntl_F_SETLK64 = 13;
+  riscv_linux_record_tdep.fcntl_F_SETLKW64 = 14;
+
+  riscv_linux_record_tdep.arg1 = RISCV_A0_REGNUM;
+  riscv_linux_record_tdep.arg2 = RISCV_A1_REGNUM;
+  riscv_linux_record_tdep.arg3 = RISCV_A2_REGNUM;
+  riscv_linux_record_tdep.arg4 = RISCV_A3_REGNUM;
+  riscv_linux_record_tdep.arg5 = RISCV_A4_REGNUM;
+  riscv_linux_record_tdep.arg6 = RISCV_A5_REGNUM;
+  riscv_linux_record_tdep.arg7 = RISCV_A7_REGNUM;
+}
+
 /* Initialize RISC-V Linux ABI info.  */
 
 static void
@@ -205,6 +463,9 @@ riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   tramp_frame_prepend_unwinder (gdbarch, &riscv_linux_sigframe);
 
   tdep->syscall_next_pc = riscv_linux_syscall_next_pc;
+  tdep->riscv_syscall_record = riscv_linux_syscall_record;
+
+  riscv64_linux_record_tdep_init (gdbarch, riscv_linux_record_tdep);
 }
 
 /* Initialize RISC-V Linux target support.  */
diff --git a/gdb/riscv-linux-tdep.h b/gdb/riscv-linux-tdep.h
new file mode 100644
index 00000000000..5ee2c94387f
--- /dev/null
+++ b/gdb/riscv-linux-tdep.h
@@ -0,0 +1,29 @@
+/* Copyright (C) 2024 Free Software Foundation, Inc.
+   Contributed by Timur Golubovich
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef RISCV_LINUX_TDEP_H
+#define RISCV_LINUX_TDEP_H
+
+#include "linux-record.h"
+
+/* riscv64_canonicalize_syscall maps from the native riscv Linux set
+   of syscall ids into a canonical set of syscall ids used by
+   process record.  */
+extern enum gdb_syscall riscv64_canonicalize_syscall (int syscall);
+
+#endif /* RISCV_LINUX_TDEP_H */
diff --git a/gdb/riscv-tdep.c b/gdb/riscv-tdep.c
index 932708ca4e9..29013bc46c1 100644
--- a/gdb/riscv-tdep.c
+++ b/gdb/riscv-tdep.c
@@ -54,9 +54,12 @@
 #include "observable.h"
 #include "prologue-value.h"
 #include "arch/riscv.h"
+#include "record-full.h"
 #include "riscv-ravenscar-thread.h"
 #include "gdbsupport/gdb-safe-ctype.h"
 
+#include <vector>
+
 /* The stack must be 16-byte aligned.  */
 #define SP_ALIGNMENT 16
 
@@ -1655,6 +1658,11 @@ class riscv_insn
   int imm_signed () const
   { return m_imm.s; }
 
+  /* Fetch instruction from target memory at ADDR, return the content of
+     the instruction, and update LEN with the instruction length.  */
+  static ULONGEST fetch_instruction (struct gdbarch *gdbarch, CORE_ADDR addr,
+                                     int *len);
+
 private:
 
   /* Extract 5 bit register field at OFFSET from instruction OPCODE.  */
@@ -1800,11 +1808,6 @@ class riscv_insn
     m_rs2 = decode_register_index_short (ival, OP_SH_CRS2S);
   }
 
-  /* Fetch instruction from target memory at ADDR, return the content of
-     the instruction, and update LEN with the instruction length.  */
-  static ULONGEST fetch_instruction (struct gdbarch *gdbarch,
-				     CORE_ADDR addr, int *len);
-
   /* The length of the instruction in bytes.  Should be 2 or 4.  */
   int m_length;
 
@@ -4415,6 +4418,9 @@ riscv_gdbarch_init (struct gdbarch_info info,
   set_gdbarch_stap_register_indirection_suffixes
     (gdbarch, stap_register_indirection_suffixes);
 
+  /* Process record-replay */
+  set_gdbarch_process_record (gdbarch, riscv_process_record);
+
   /* Hook in OS ABI-specific overrides, if they have been registered.  */
   gdbarch_init_osabi (info, gdbarch);
 
@@ -4833,3 +4839,690 @@ this option can be used."),
 				&setriscvcmdlist,
 				&showriscvcmdlist);
 }
+
+static bool
+try_read (struct regcache *regcache, int regnum, ULONGEST &addr)
+{
+  gdb_assert (regcache);
+
+  if (regcache->raw_read<ULONGEST> (regnum, &addr)
+      != register_status::REG_VALID)
+    {
+      warning (_ ("Can not read at address %lx"), addr);
+      return false;
+    }
+  return true;
+}
+
+class riscv_recorded_insn final
+{
+public:
+  using regnum_type = int;
+  using memory_type = std::pair<CORE_ADDR, int>;
+
+  enum class record_type
+  {
+    UNKNOWN,
+    ORDINARY,
+
+    // corner cases
+    ECALL,
+    EBREAK,
+  };
+
+private:
+  using recorded_regs = std::vector<regnum_type>;
+  using recorded_mems = std::vector<memory_type>;
+
+  using mem_addr = decltype (std::declval<memory_type> ().first);
+  using mem_len = decltype (std::declval<memory_type> ().second);
+
+  record_type m_record_type = record_type::UNKNOWN;
+
+  bool m_error_occured = false;
+
+  recorded_regs m_regs;
+  recorded_mems m_mems;
+
+  /* Helper for decode 16-bit instruction RS1. */
+  static regnum_type
+  decode_crs1_short (ULONGEST opcode) noexcept
+  {
+    return ((opcode >> OP_SH_CRS1S) & OP_MASK_CRS1S) + 8;
+  }
+
+  /* Helper for decode 16-bit instruction RS2. */
+  static regnum_type
+  decode_crs2_short (ULONGEST opcode) noexcept
+  {
+    return ((opcode >> OP_SH_CRS2S) & OP_MASK_CRS2S) + 8;
+  }
+
+  /* Helper for decode 16-bit instruction CRS1. */
+  static regnum_type
+  decode_crs1 (ULONGEST opcode) noexcept
+  {
+    return ((opcode >> OP_SH_RD) & OP_MASK_RD);
+  }
+
+  /* Helper for decode 16-bit instruction CRS2. */
+  static regnum_type
+  decode_crs2 (ULONGEST opcode) noexcept
+  {
+    return ((opcode >> OP_SH_CRS2) & OP_MASK_CRS2);
+  }
+
+  /* Helper for decode 32-bit instruction RD. */
+  static regnum_type
+  decode_rd (ULONGEST ival) noexcept
+  {
+    return (ival >> OP_SH_RD) & OP_MASK_RD;
+  }
+
+  /* Helper for decode 32-bit instruction RS1. */
+  static regnum_type
+  decode_rs1 (ULONGEST ival) noexcept
+  {
+    return (ival >> OP_SH_RS1) & OP_MASK_RS1;
+  }
+
+  /* Helper for decode 32-bit instruction RS2. */
+  static regnum_type
+  decode_rs2 (ULONGEST ival) noexcept
+  {
+    return (ival >> OP_SH_RS2) & OP_MASK_RS2;
+  }
+
+  /* Helper for decode 32-bit instruction CSR. */
+  static regnum_type
+  decode_csr (ULONGEST ival) noexcept
+  {
+    return (ival >> OP_SH_CSR) & OP_MASK_CSR;
+  }
+
+  bool
+  set_ordinary_record_type () noexcept
+  {
+    m_record_type = record_type::ORDINARY;
+    return true;
+  }
+
+  bool
+  set_error () noexcept
+  {
+    m_error_occured = true;
+    return false;
+  }
+
+  bool
+  has_error () const noexcept
+  {
+    return m_error_occured;
+  }
+
+  bool
+  read_reg (struct regcache *regcache, regnum_type reg,
+            ULONGEST &addr) noexcept
+  {
+    gdb_assert (regcache);
+
+    if (!try_read (regcache, reg, addr))
+      {
+        return set_error ();
+      }
+    return true;
+  }
+
+  bool
+  save_reg (regnum_type regnum) noexcept
+  {
+    try
+      {
+        m_regs.emplace_back (regnum);
+        return true;
+      }
+    catch (const std::bad_alloc &ex)
+      {
+        warning (_ ("Exception was caught during reverse execution: %s"),
+                 ex.what ());
+        return set_error ();
+      }
+  }
+
+  bool
+  save_mem (mem_addr addr, mem_len len) noexcept
+  {
+    try
+      {
+        m_mems.emplace_back (addr, len);
+        return true;
+      }
+    catch (const std::bad_alloc &ex)
+      {
+        warning (_ ("Exception was caught during reverse execution: %s"),
+                 ex.what ());
+        return set_error ();
+      }
+  }
+
+  static bool
+  need_save_pc (ULONGEST ival) noexcept
+  {
+    return is_beq_insn (ival) || is_bne_insn (ival) || is_blt_insn (ival)
+           || is_bge_insn (ival) || is_bltu_insn (ival) || is_bgeu_insn (ival)
+           || is_fence_insn (ival) || is_pause_insn (ival)
+           || is_fence_i_insn (ival);
+  }
+
+  /* Returns true if instruction is classified */
+  bool
+  try_save_pc (ULONGEST ival) noexcept
+  {
+    if (!need_save_pc (ival))
+      return false;
+
+    return set_ordinary_record_type ();
+  }
+
+  static bool
+  need_save_pc_rd (ULONGEST ival) noexcept
+  {
+    return is_lui_insn (ival) || is_auipc_insn (ival) || is_jal_insn (ival)
+           || is_jalr_insn (ival) || is_lb_insn (ival) || is_lh_insn (ival)
+           || is_lw_insn (ival) || is_ld_insn (ival) || is_lbu_insn (ival)
+           || is_lhu_insn (ival) || is_lb_insn (ival) || is_lh_insn (ival)
+           || is_lw_insn (ival) || is_ld_insn (ival) || is_lbu_insn (ival)
+           || is_lhu_insn (ival) || is_addi_insn (ival) || is_slti_insn (ival)
+           || is_sltiu_insn (ival) || is_xori_insn (ival) || is_ori_insn (ival)
+           || is_andi_insn (ival) || is_slli_insn (ival) || is_srli_insn (ival)
+           || is_srai_insn (ival) || is_add_insn (ival) || is_sub_insn (ival)
+           || is_sll_insn (ival) || is_slt_insn (ival) || is_sltu_insn (ival)
+           || is_xor_insn (ival) || is_srl_insn (ival) || is_sra_insn (ival)
+           || is_or_insn (ival) || is_and_insn (ival) || is_lwu_insn (ival)
+           || is_addiw_insn (ival) || is_slliw_insn (ival)
+           || is_srliw_insn (ival) || is_sraiw_insn (ival)
+           || is_addw_insn (ival) || is_subw_insn (ival) || is_sllw_insn (ival)
+           || is_srlw_insn (ival) || is_sraw_insn (ival) || is_mul_insn (ival)
+           || is_mulh_insn (ival) || is_mulhsu_insn (ival)
+           || is_mulhu_insn (ival) || is_div_insn (ival) || is_divu_insn (ival)
+           || is_rem_insn (ival) || is_remu_insn (ival) || is_mulw_insn (ival)
+           || is_divw_insn (ival) || is_divuw_insn (ival)
+           || is_remw_insn (ival) || is_remuw_insn (ival)
+           || is_lr_w_insn (ival) || is_lr_d_insn (ival)
+           || is_fcvt_l_s_insn (ival) || is_fcvt_lu_s_insn (ival)
+           || is_feq_d_insn (ival) || is_flt_d_insn (ival)
+           || is_fle_d_insn (ival) || is_fclass_d_insn (ival)
+           || is_fcvt_w_d_insn (ival) || is_fcvt_wu_d_insn (ival)
+           || is_fcvt_d_w_insn (ival) || is_fcvt_l_d_insn (ival)
+           || is_fcvt_lu_d_insn (ival) || is_fmv_x_d_insn (ival);
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_rd (ULONGEST ival) noexcept
+  {
+    if (!need_save_pc_rd (ival))
+      return false;
+
+    return !save_reg (decode_rd (ival)) || set_ordinary_record_type ();
+  }
+
+  static bool
+  need_save_pc_fprd (ULONGEST ival) noexcept
+  {
+    return is_fmadd_s_insn (ival) || is_fmsub_s_insn (ival)
+           || is_fnmsub_s_insn (ival) || is_fnmadd_s_insn (ival)
+           || is_fadd_s_insn (ival) || is_fsub_s_insn (ival)
+           || is_fmul_s_insn (ival) || is_fdiv_s_insn (ival)
+           || is_fsqrt_s_insn (ival) || is_fsgnj_s_insn (ival)
+           || is_fsgnjn_s_insn (ival) || is_fsgnjx_s_insn (ival)
+           || is_fmin_s_insn (ival) || is_fmax_s_insn (ival)
+           || is_flw_insn (ival) || is_fld_insn (ival)
+           || is_fcvt_s_w_insn (ival) || is_fcvt_s_wu_insn (ival)
+           || is_fmv_s_x_insn (ival) || is_fcvt_s_l_insn (ival)
+           || is_fcvt_s_lu_insn (ival) || is_fmadd_d_insn (ival)
+           || is_fmsub_d_insn (ival) || is_fnmsub_d_insn (ival)
+           || is_fnmadd_d_insn (ival) || is_fadd_d_insn (ival)
+           || is_fsub_d_insn (ival) || is_fmul_d_insn (ival)
+           || is_fdiv_d_insn (ival) || is_fsqrt_d_insn (ival)
+           || is_fsgnj_d_insn (ival) || is_fsgnjn_d_insn (ival)
+           || is_fsgnjx_d_insn (ival) || is_fmin_d_insn (ival)
+           || is_fmax_d_insn (ival) || is_fcvt_s_d_insn (ival)
+           || is_fcvt_d_s_insn (ival) || is_fcvt_d_wu_insn (ival)
+           || is_fcvt_d_l_insn (ival) || is_fcvt_d_lu_insn (ival)
+           || is_fmv_d_x_insn (ival);
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_fprd (ULONGEST ival) noexcept
+  {
+    if (!need_save_pc_fprd (ival))
+      return false;
+
+    return !save_reg (RISCV_FIRST_FP_REGNUM + decode_rd (ival))
+           || set_ordinary_record_type ();
+  }
+
+  static bool
+  need_save_pc_rd_csr (ULONGEST ival) noexcept
+  {
+    return is_csrrw_insn (ival) || is_csrrs_insn (ival) || is_csrrc_insn (ival)
+           || is_csrrwi_insn (ival) || is_csrrsi_insn (ival)
+           || is_csrrc_insn (ival);
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_rd_csr (ULONGEST ival) noexcept
+  {
+    if (!need_save_pc_rd_csr (ival))
+      return false;
+
+    return !save_reg (decode_rd (ival))
+           || !save_reg (RISCV_FIRST_CSR_REGNUM + decode_csr (ival))
+           || set_ordinary_record_type ();
+  }
+
+  /* If return value is > 0, than instruction needs saving memory len */
+  static mem_len
+  need_save_pc_mem (ULONGEST ival) noexcept
+  {
+    if (is_sb_insn (ival))
+      return 1;
+    if (is_sh_insn (ival))
+      return 2;
+    if (is_sw_insn (ival) || is_fsw_insn (ival))
+      return 4;
+    if (is_sd_insn (ival) || is_fsd_insn (ival))
+      return 8;
+    return 0;
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_mem (ULONGEST ival, struct regcache *regcache) noexcept
+  {
+    gdb_assert (regcache);
+
+    mem_addr addr = 0;
+    auto len = need_save_pc_mem (ival);
+    if (len <= 0)
+      return false;
+
+    mem_len offset = EXTRACT_STYPE_IMM (ival);
+    return !read_reg (regcache, decode_rs1 (ival), addr)
+           || !save_mem (addr + offset, len) || set_ordinary_record_type ();
+  }
+
+  /* If return value is > 0, than instruction needs saving memory len */
+  static mem_len
+  need_save_pc_rd_mem (ULONGEST ival) noexcept
+  {
+    if (is_sc_w_insn (ival) || is_amoadd_w_insn (ival)
+        || is_amoxor_w_insn (ival) || is_amoand_w_insn (ival)
+        || is_amoor_w_insn (ival) || is_amomin_w_insn (ival)
+        || is_amomax_w_insn (ival) || is_amominu_w_insn (ival)
+        || is_amomaxu_w_insn (ival))
+      return 4;
+    if (is_sc_d_insn (ival) || is_amoadd_d_insn (ival)
+        || is_amoxor_d_insn (ival) || is_amoand_d_insn (ival)
+        || is_amoor_d_insn (ival) || is_amomin_d_insn (ival)
+        || is_amomax_d_insn (ival) || is_amominu_d_insn (ival)
+        || is_amomaxu_d_insn (ival))
+      return 8;
+    return 0;
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_rd_mem (ULONGEST ival, struct regcache *regcache) noexcept
+  {
+    gdb_assert (regcache);
+
+    auto len = need_save_pc_rd_mem (ival);
+    mem_addr addr = 0;
+    if (len <= 0)
+      return false;
+
+    return !read_reg (regcache, decode_rs1 (ival), addr)
+           || !save_mem (addr, len) || !save_reg (decode_rd (ival))
+           || set_ordinary_record_type ();
+  }
+
+  /* If return value is > 0, than instruction needs saving memory len */
+  static mem_len
+  need_save_pc_rs2_rd_mem (ULONGEST ival) noexcept
+  {
+    if (is_amoswap_w_insn (ival))
+      return 4;
+    if (is_amoswap_d_insn (ival))
+      return 8;
+    return 0;
+  }
+
+  /* Returns true if instruction is classified. Needs error checking after */
+  bool
+  try_save_pc_rs2_rd_mem (ULONGEST ival, struct regcache *regcache) noexcept
+  {
+    gdb_assert (regcache);
+
+    mem_addr addr = 0;
+    auto len = need_save_pc_rs2_rd_mem (ival);
+    if (len <= 0)
+      return false;
+
+    return !read_reg (regcache, decode_rs1 (ival), addr)
+           || !save_mem (addr, len) || !save_reg (decode_rs2 (ival))
+           || !save_reg (decode_rd (ival)) || set_ordinary_record_type ();
+  }
+
+  /* Returns true if instruction is successfully recorder.
+     Else returns false */
+  bool
+  record_insn_len4 (ULONGEST ival, struct regcache *regcache) noexcept
+  {
+    gdb_assert (regcache);
+
+    if (is_ecall_insn (ival))
+      {
+        m_record_type = record_type::ECALL;
+        return true;
+      }
+
+    if (is_ebreak_insn (ival))
+      {
+        m_record_type = record_type::EBREAK;
+        return true;
+      }
+
+    if (try_save_pc (ival) || try_save_pc_rd (ival) || try_save_pc_fprd (ival)
+        || try_save_pc_rd_csr (ival) || try_save_pc_mem (ival, regcache)
+        || try_save_pc_rd_mem (ival, regcache)
+        || try_save_pc_rs2_rd_mem (ival, regcache))
+      {
+        return !has_error ();
+      }
+
+    warning (_ ("Currently this instruction with len 4(%lx) is unsupported"),
+             ival);
+    return false;
+  }
+
+  /* Returns true if instruction is successfully recorder.
+     Else returns false */
+  bool
+  record_insn_len2 (ULONGEST ival, struct regcache *regcache,
+                    struct gdbarch *gdbarch) noexcept
+  {
+    gdb_assert (regcache);
+    gdb_assert (gdbarch);
+
+    mem_addr addr = 0;
+    auto xlen = riscv_isa_xlen (gdbarch);
+
+    /* The order here is very important, because
+        opcodes of some instructions may be the same. */
+
+    if (is_c_addi4spn_insn (ival) || is_c_lw_insn (ival)
+        || (xlen == 8 && is_c_ld_insn (ival)))
+      {
+        return !save_reg (decode_crs2_short (ival))
+               || set_ordinary_record_type ();
+      }
+
+    if (is_c_fld_insn (ival) || (xlen == 4 && is_c_flw_insn (ival)))
+      {
+        return !save_reg (RISCV_FIRST_FP_REGNUM + decode_crs2_short (ival))
+               || set_ordinary_record_type ();
+      }
+
+    if (is_c_fsd_insn (ival) || (xlen == 8 && is_c_sd_insn (ival)))
+      {
+        int offset = EXTRACT_CLTYPE_LD_IMM (ival);
+        return !read_reg (regcache, decode_crs1_short (ival), addr)
+               || !save_mem (addr + offset, 8) || set_ordinary_record_type ();
+      }
+
+    if ((xlen == 4 && is_c_fsw_insn (ival)) || is_c_sw_insn (ival))
+      {
+        int offset = EXTRACT_CLTYPE_LW_IMM (ival);
+        return !read_reg (regcache, decode_crs1_short (ival), addr)
+               || !save_mem (addr + offset, 4) || set_ordinary_record_type ();
+      }
+
+    if (is_c_nop_insn (ival))
+      {
+        return set_ordinary_record_type ();
+      }
+
+    if (is_c_addi_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (xlen == 4 && is_c_jal_insn (ival))
+      {
+        return !save_reg (RISCV_RA_REGNUM) || set_ordinary_record_type ();
+      }
+
+    if ((xlen == 8 && is_c_addiw_insn (ival)) || is_c_li_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_addi16sp_insn (ival))
+      {
+        return !save_reg (RISCV_SP_REGNUM) || set_ordinary_record_type ();
+      }
+
+    if (is_c_lui_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_srli_insn (ival) || is_c_srai_insn (ival) || is_c_andi_insn (ival)
+        || is_c_sub_insn (ival) || is_c_xor_insn (ival) || is_c_or_insn (ival)
+        || is_c_and_insn (ival) || (xlen == 8 && is_c_subw_insn (ival))
+        || (xlen == 8 && is_c_addw_insn (ival)))
+      {
+        return !save_reg (decode_crs1_short (ival))
+               || set_ordinary_record_type ();
+      }
+
+    if (is_c_j_insn (ival) || is_c_beqz_insn (ival) || is_c_bnez_insn (ival))
+      {
+        return set_ordinary_record_type ();
+      }
+
+    if (is_c_slli_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_fldsp_insn (ival) || (xlen == 4 && is_c_flwsp_insn (ival)))
+      {
+        return !save_reg (RISCV_FIRST_FP_REGNUM + decode_crs1 (ival))
+               || set_ordinary_record_type ();
+      }
+
+    if (is_c_lwsp_insn (ival) || (xlen == 8 && is_c_ldsp_insn (ival)))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_jr_insn (ival))
+      {
+        return set_ordinary_record_type ();
+      }
+
+    if (is_c_mv_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_ebreak_insn (ival))
+      {
+        m_record_type = record_type::EBREAK;
+        return true;
+      }
+
+    if (is_c_jalr_insn (ival))
+      {
+        return !save_reg (RISCV_RA_REGNUM) || set_ordinary_record_type ();
+      }
+
+    if (is_c_add_insn (ival))
+      {
+        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
+      }
+
+    if (is_c_fsdsp_insn (ival) || (xlen == 8 && is_c_sdsp_insn (ival)))
+      {
+        int offset = EXTRACT_CSSTYPE_SDSP_IMM (ival);
+        return !read_reg (regcache, RISCV_SP_REGNUM, addr)
+               || !save_mem (addr + offset, 8) || set_ordinary_record_type ();
+      }
+
+    if (is_c_swsp_insn (ival) || (xlen == 4 && is_c_fswsp_insn (ival)))
+      {
+        int offset = EXTRACT_CSSTYPE_SWSP_IMM (ival);
+        return !read_reg (regcache, RISCV_SP_REGNUM, addr)
+               || !save_mem (addr + offset, 4) || set_ordinary_record_type ();
+      }
+
+    warning (_ ("Currently this instruction with len 2(%lx) is unsupported"),
+             ival);
+    return false;
+  }
+
+public:
+  using regs_iter = recorded_regs::const_iterator;
+  using mems_iter = recorded_mems::const_iterator;
+
+  bool
+  record (gdbarch *gdbarch, struct regcache *regcache, CORE_ADDR addr) noexcept
+  {
+    int m_length = 0;
+    auto ival = riscv_insn::fetch_instruction (gdbarch, addr, &m_length);
+    if (!save_reg (RISCV_PC_REGNUM))
+      return false;
+
+    if (m_length == 4)
+      return record_insn_len4 (ival, regcache);
+
+    if (m_length == 2)
+      return record_insn_len2 (ival, regcache, gdbarch);
+
+    /* 6 bytes or more.  If the instruction is longer than 8 bytes, we don't
+have full instruction bits in ival.  At least, such long instructions
+are not defined yet, so just ignore it.  */
+    gdb_assert (m_length > 0 && m_length % 2 == 0);
+
+    warning (_ ("Can not record unknown instruction (opcode = %lx)"), ival);
+    return false;
+  }
+
+  record_type
+  get_record_type () const noexcept
+  {
+    return m_record_type;
+  }
+
+  regs_iter
+  regs_begin () const noexcept
+  {
+    return m_regs.begin ();
+  }
+
+  regs_iter
+  regs_end () const noexcept
+  {
+    return m_regs.end ();
+  }
+
+  mems_iter
+  mems_begin () const noexcept
+  {
+    return m_mems.begin ();
+  }
+
+  mems_iter
+  mems_end () const noexcept
+  {
+    return m_mems.end ();
+  }
+};
+
+static int
+riscv_make_record_process (struct gdbarch *gdbarch, struct regcache *regcache,
+                           const riscv_recorded_insn &insn)
+{
+  gdb_assert (gdbarch && regcache);
+
+  riscv_gdbarch_tdep *tdep = gdbarch_tdep<riscv_gdbarch_tdep> (gdbarch);
+  auto regs_begin = insn.regs_begin ();
+  auto regs_end = insn.regs_end ();
+  if (std::any_of (regs_begin, regs_end, [&regcache] (auto &&reg_it) {
+        return record_full_arch_list_add_reg (regcache, reg_it);
+      }))
+    return -1;
+
+  auto mems_begin = insn.mems_begin ();
+  auto mems_end = insn.mems_end ();
+  if (std::any_of (mems_begin, mems_end, [] (auto &&mem_it) {
+        return record_full_arch_list_add_mem (mem_it.first, mem_it.second);
+      }))
+    return -1;
+
+  switch (insn.get_record_type ())
+    {
+    case riscv_recorded_insn::record_type::ORDINARY:
+      break;
+
+    case riscv_recorded_insn::record_type::ECALL:
+      {
+        if (!tdep->riscv_syscall_record)
+          {
+            warning (_ ("Syscall record is not supported"));
+            return -1;
+          }
+        ULONGEST reg_val = 0;
+        if (!try_read (regcache, RISCV_A7_REGNUM, reg_val))
+          {
+            return -1;
+          }
+        return tdep->riscv_syscall_record (regcache, reg_val);
+      }
+
+    case riscv_recorded_insn::record_type::EBREAK:
+      break;
+
+    default:
+      return -1;
+    }
+  return 0;
+}
+
+int
+riscv_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
+                      CORE_ADDR addr)
+{
+  gdb_assert (gdbarch && regcache);
+
+  riscv_recorded_insn insn;
+  if (!insn.record (gdbarch, regcache, addr))
+    {
+      record_full_arch_list_add_end ();
+      return -1;
+    }
+
+  auto ret_val = riscv_make_record_process (gdbarch, regcache, insn);
+
+  if (record_full_arch_list_add_end ())
+    {
+      return -1;
+    }
+
+  return ret_val;
+}
diff --git a/gdb/riscv-tdep.h b/gdb/riscv-tdep.h
index 4bdc2e7a3d5..505371ba4f6 100644
--- a/gdb/riscv-tdep.h
+++ b/gdb/riscv-tdep.h
@@ -35,6 +35,10 @@ enum
   RISCV_FP_REGNUM = 8,		/* Frame Pointer.  */
   RISCV_A0_REGNUM = 10,		/* First argument.  */
   RISCV_A1_REGNUM = 11,		/* Second argument.  */
+  RISCV_A2_REGNUM = 12,		/* Third argument.  */
+  RISCV_A3_REGNUM = 13,		/* Forth argument.  */
+  RISCV_A4_REGNUM = 14,		/* Fifth argument.  */
+  RISCV_A5_REGNUM = 15,		/* Sixth argument.  */
   RISCV_A7_REGNUM = 17,		/* Seventh argument.  */
   RISCV_PC_REGNUM = 32,		/* Program Counter.  */
 
@@ -113,6 +117,11 @@ struct riscv_gdbarch_tdep : gdbarch_tdep_base
   /* Return the expected next PC assuming FRAME is stopped at a syscall
      instruction.  */
   CORE_ADDR (*syscall_next_pc) (const frame_info_ptr &frame) = nullptr;
+
+  /* Syscall record.  */
+  int (*riscv_syscall_record) (struct regcache *regcache,
+                               unsigned long svc_number)
+      = nullptr;
 };
 
 
@@ -177,6 +186,12 @@ extern void riscv_supply_regset (const struct regset *regset,
 				  struct regcache *regcache, int regnum,
 				  const void *regs, size_t len);
 
+/* Parse the current instruction, and record the values of the
+   registers and memory that will be changed by the current
+   instruction.  Returns -1 if something goes wrong, 0 otherwise.  */
+extern int riscv_process_record (struct gdbarch *gdbarch,
+                                 struct regcache *regcache, CORE_ADDR addr);
+
 /* The names of the RISC-V target description features.  */
 extern const char *riscv_feature_name_csr;
 
diff --git a/gdb/syscalls/riscv-canonicalize-syscall-gen.py b/gdb/syscalls/riscv-canonicalize-syscall-gen.py
new file mode 100644
index 00000000000..235f858f5ff
--- /dev/null
+++ b/gdb/syscalls/riscv-canonicalize-syscall-gen.py
@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+# pylint: disable=invalid-name
+
+# Copyright (C) 2024 Free Software Foundation, Inc.
+# Contributed by Timur Golubovich
+
+# This file is part of GDB.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import re
+import sys
+from pathlib import Path as _Path
+
+head = """\
+/* DO NOT EDIT: Autogenerated by riscv-canonicalize-syscall-gen.py  */
+
+#include "defs.h"
+#include "riscv-linux-tdep.h"
+
+enum gdb_syscall
+riscv64_canonicalize_syscall (int syscall)
+{
+  switch (syscall)
+    {
+"""
+
+tail = """\
+    default:
+      return gdb_sys_no_syscall;
+    }
+}
+"""
+
+
+class Generator:
+    def _get_gdb_syscalls(self, gdb_syscalls_path: _Path) -> list[str]:
+        gdb_syscalls: list[str] = []
+        with open(gdb_syscalls_path, "r", encoding="UTF-8") as file:
+            lines = file.readlines()
+            for line in lines:
+                match = re.search(r"\s*(?P<name>gdb_sys_[^S]+)\S*=", line)
+                if match:
+                    gdb_syscalls.append(match.group("name").strip())
+        return gdb_syscalls
+
+    def _get_canon_syscalls_lines(self, syscalls_path: _Path, gdb_syscalls: list[str]) -> list[str]:
+        canon_syscalls: dict[int, str] = {}
+        with open(syscalls_path, "r", encoding="UTF-8") as file:
+            lines = file.readlines()
+            for line in lines:
+                match = re.match(r"#define\s+__NR_(?P<name>[^\s]+)\s+(?P<number>\d+)", line)
+                if match:
+                    syscall_name = match.group("name")
+                    syscall_num = int(match.group("number"))
+                    gdb_syscall_name = f"gdb_sys_{syscall_name}"
+                    if gdb_syscall_name in gdb_syscalls:
+                        canon_syscalls[syscall_num] = (
+                            f"    case {syscall_num}: // {line}      return {gdb_syscall_name};\n"
+                        )
+                    # this is a place for corner cases
+                    elif syscall_name == "mmap":
+                        gdb_old_syscall_name = "gdb_old_mmap"
+                        canon_syscalls[syscall_num] = f"    case {syscall_num}:\n      return {gdb_old_syscall_name};\n"
+                    else:
+                        canon_syscalls[syscall_num] = f"    // case {syscall_num}: return {gdb_syscall_name};\n"
+        return [canon_syscalls[syscall_num] for syscall_num in sorted(canon_syscalls)]
+
+    def generate(self, syscalls_path: _Path) -> None:
+        repo_path = _Path(__file__).parent.parent.parent
+        gdb_syscalls_path = repo_path / "gdb" / "linux-record.h"
+        canon_syscalls_path = repo_path / "gdb" / "riscv-canonicalize-syscall.c"
+
+        gdb_syscalls = self._get_gdb_syscalls(gdb_syscalls_path)
+        canon_syscalls_lines = self._get_canon_syscalls_lines(syscalls_path, gdb_syscalls)
+
+        with open(canon_syscalls_path, "w", encoding="UTF-8") as file:
+            file.writelines(head)
+            file.writelines(canon_syscalls_lines)
+            file.writelines(tail)
+
+
+help_message = """\
+Generate file gdb/riscv-canonicalize-syscall.c
+from path to riscv linux syscalls.
+"""
+
+
+def setup_parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser(description=help_message)
+    parser.add_argument(
+        "-i",
+        "--input",
+        type=_Path,
+        required=True,
+        help="path to riscv linux syscalls (riscv-glibc/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h)",
+    )
+    return parser
+
+
+def main(argv: list[str]) -> int:
+    try:
+        parser = setup_parser()
+        args = parser.parse_args(argv)
+        generator = Generator()
+        generator.generate(args.input)
+        return 0
+    except RuntimeError as e:
+        print(str(e))
+        return -1
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 410f99e3350..b048ac7078b 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3718,7 +3718,8 @@ proc supports_reverse {} {
          || [istarget "i\[34567\]86-*-linux*"]
          || [istarget "aarch64*-*-linux*"]
          || [istarget "powerpc*-*-linux*"]
-         || [istarget "s390*-*-linux*"] } {
+         || [istarget "s390*-*-linux*"]
+         || [istarget "riscv*-*-*"] } {
 	return 1
     }
 
-- 
2.34.1


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] gdb/riscv: Add record support for rv64gc instructions
  2024-11-15 22:26 [PATCH] gdb/riscv: Add record support for rv64gc instructions Timur
@ 2024-11-18 19:46 ` Guinevere Larsen
  0 siblings, 0 replies; 2+ messages in thread
From: Guinevere Larsen @ 2024-11-18 19:46 UTC (permalink / raw)
  To: Timur, gdb-patches

On 11/15/24 7:26 PM, Timur wrote:
> Timur Golubovich timurgol007@gmail.com

Hi!

In GDB we like to have descriptive commit messages, even if the changes 
feel obvious to you. That way it is easier for us to review the changes, 
as we understand the thinking behind your choices, and we just need to 
confirm that the code does what the commit message says.

An example of something that would be good to explain would be, why did 
you decide to make a python script and keep the riscv canonicalization 
of syscalls as a generated script? These files tend to have few updates 
once generated, and it is usually easier to do the updates by hand than 
getting the list of syscalls and re-generating the full .c file, 
especially considering that GDB likes to have long term compatibility, 
so if a syscall ever gets deprecated and removed, we would take a lot 
longer to remove it from our support. Plus, if a user of Risc-V ever 
notices that the file is out of date it would be easy for any GDB 
developer to add support to the missing syscall by hand than to download 
glibc source files and re-run the script. So I (as the record-full 
maintainer, but someone who doesn't understand risc-v) would prefer if 
the file was not generated by a script.

I also have a few more comments inlined. I haven't thoroughly reviewed 
all lines so there may be other coding style changes I missed. I 
encourage you to read GDB's style in the wiki, here: 
https://sourceware.org/gdb/wiki/Internals%20GDB-C-Coding-Standards

> ---
>   gdb/configure.tgt                             |   4 +-
>   gdb/riscv-canonicalize-syscall.c              | 555 ++++++++++++++
>   gdb/riscv-linux-tdep.c                        | 261 +++++++
>   gdb/riscv-linux-tdep.h                        |  29 +
>   gdb/riscv-tdep.c                              | 703 +++++++++++++++++-
>   gdb/riscv-tdep.h                              |  15 +
>   .../riscv-canonicalize-syscall-gen.py         | 126 ++++
>   gdb/testsuite/lib/gdb.exp                     |   3 +-
>   8 files changed, 1688 insertions(+), 8 deletions(-)
>   create mode 100644 gdb/riscv-canonicalize-syscall.c
>   create mode 100644 gdb/riscv-linux-tdep.h
>   create mode 100644 gdb/syscalls/riscv-canonicalize-syscall-gen.py
>
> diff --git a/gdb/configure.tgt b/gdb/configure.tgt
> index 62df71b13fa..f965e03e84d 100644
> --- a/gdb/configure.tgt
> +++ b/gdb/configure.tgt
> @@ -545,8 +545,8 @@ riscv*-*-freebsd*)
>   
>   riscv*-*-linux*)
>   	# Target: Linux/RISC-V
> -	gdb_target_obs="riscv-linux-tdep.o glibc-tdep.o \
> - 			linux-tdep.o solib-svr4.o symfile-mem.o linux-record.o"
> +	gdb_target_obs="riscv-linux-tdep.o riscv-canonicalize-syscall.o \
> +	glibc-tdep.o linux-tdep.o solib-svr4.o symfile-mem.o linux-record.o"
Please keep the indentation as it was.
>   	;;
>   
>   riscv*-*-*)
> diff --git a/gdb/riscv-canonicalize-syscall.c b/gdb/riscv-canonicalize-syscall.c
> new file mode 100644
> index 00000000000..779bbd9335c
> --- /dev/null
> +++ b/gdb/riscv-canonicalize-syscall.c
Generated files should end with the -gen suffix, so this should be 
riscv-canonicalize-syscall-gen.c if the final version of this change 
continues using the python script.
> @@ -0,0 +1,555 @@
> +/* DO NOT EDIT: Autogenerated by riscv-canonicalize-syscall-gen.py  */
Even for generated files, the copyright blurb should be added here.
> +
> +#include "defs.h"
> +#include "riscv-linux-tdep.h"
> +
> +enum gdb_syscall
> +riscv64_canonicalize_syscall (int syscall)
> +{
> +  switch (syscall)
> +    {
> +    case 0: // #define __NR_io_setup 0

All comments should be in the form /* */, rather than //

I would also prefer if this followed what other architectures do, 
defining an enum to relate syscall numbers in a RISCV system to their 
names, and then this function returning the gdb_sys enum numbers, 
however I don't expect to be working on RISCV in the near future, so 
feel free to ignore this comment if the other RISCV maintainers are ok 
with this style. This would make it so no #define comment is necessary

> +      return gdb_sys_io_setup;
> +    case 1: // #define __NR_io_destroy 1
> +      return gdb_sys_io_destroy;
> +    case 2: // #define __NR_io_submit 2
> +      return gdb_sys_io_submit;
> +    case 3: // #define __NR_io_cancel 3
> +      return gdb_sys_io_cancel;
> +    case 4: // #define __NR_io_getevents 4
> +      return gdb_sys_io_getevents;
> +    case 5: // #define __NR_setxattr 5
> +      return gdb_sys_setxattr;
> +    case 6: // #define __NR_lsetxattr 6
> +      return gdb_sys_lsetxattr;
> +    case 7: // #define __NR_fsetxattr 7
> +      return gdb_sys_fsetxattr;
> +    case 8: // #define __NR_getxattr 8
> +      return gdb_sys_getxattr;
> +    case 9: // #define __NR_lgetxattr 9
> +      return gdb_sys_lgetxattr;
> +    case 10: // #define __NR_fgetxattr 10
> +      return gdb_sys_fgetxattr;
> +    case 11: // #define __NR_listxattr 11
> +      return gdb_sys_listxattr;
> +    case 12: // #define __NR_llistxattr 12
> +      return gdb_sys_llistxattr;
> +    case 13: // #define __NR_flistxattr 13
> +      return gdb_sys_flistxattr;
> +    case 14: // #define __NR_removexattr 14
> +      return gdb_sys_removexattr;
> +    case 15: // #define __NR_lremovexattr 15
> +      return gdb_sys_lremovexattr;
> +    case 16: // #define __NR_fremovexattr 16
> +      return gdb_sys_fremovexattr;
> +    case 17: // #define __NR_getcwd 17
> +      return gdb_sys_getcwd;
> +    case 18: // #define __NR_lookup_dcookie 18
> +      return gdb_sys_lookup_dcookie;
> +    case 19: // #define __NR_eventfd2 19
> +      return gdb_sys_eventfd2;
> +    case 20: // #define __NR_epoll_create1 20
> +      return gdb_sys_epoll_create1;
> +    case 21: // #define __NR_epoll_ctl 21
> +      return gdb_sys_epoll_ctl;
> +    case 22: // #define __NR_epoll_pwait 22
> +      return gdb_sys_epoll_pwait;
> +    case 23: // #define __NR_dup 23
> +      return gdb_sys_dup;
> +    case 24: // #define __NR_dup3 24
> +      return gdb_sys_dup3;
> +    case 25: // #define __NR_fcntl 25
> +      return gdb_sys_fcntl;
> +    case 26: // #define __NR_inotify_init1 26
> +      return gdb_sys_inotify_init1;
> +    case 27: // #define __NR_inotify_add_watch 27
> +      return gdb_sys_inotify_add_watch;
> +    case 28: // #define __NR_inotify_rm_watch 28
> +      return gdb_sys_inotify_rm_watch;
> +    case 29: // #define __NR_ioctl 29
> +      return gdb_sys_ioctl;
> +    case 30: // #define __NR_ioprio_set 30
> +      return gdb_sys_ioprio_set;
> +    case 31: // #define __NR_ioprio_get 31
> +      return gdb_sys_ioprio_get;
> +    case 32: // #define __NR_flock 32
> +      return gdb_sys_flock;
> +    case 33: // #define __NR_mknodat 33
> +      return gdb_sys_mknodat;
> +    case 34: // #define __NR_mkdirat 34
> +      return gdb_sys_mkdirat;
> +    case 35: // #define __NR_unlinkat 35
> +      return gdb_sys_unlinkat;
> +    case 36: // #define __NR_symlinkat 36
> +      return gdb_sys_symlinkat;
> +    case 37: // #define __NR_linkat 37
> +      return gdb_sys_linkat;
> +    // case 39: return gdb_sys_umount2;

I don't think these provide much help, since syscall numbers are os+cpu 
specific, and is the whole reason why we have this function 
canonicalizing the syscall numbers.  Again, take this as only a 
suggestion, as I am not familiar with riscv code.

> +    case 40: // #define __NR_mount 40
> +      return gdb_sys_mount;
> +    case 41: // #define __NR_pivot_root 41
> +      return gdb_sys_pivot_root;
> +    case 42: // #define __NR_nfsservctl 42
> +      return gdb_sys_nfsservctl;
> +    case 43: // #define __NR_statfs 43
> +      return gdb_sys_statfs;
> +    case 44: // #define __NR_fstatfs 44
> +      return gdb_sys_fstatfs;
> +    case 45: // #define __NR_truncate 45
> +      return gdb_sys_truncate;
> +    case 46: // #define __NR_ftruncate 46
> +      return gdb_sys_ftruncate;
> +    case 47: // #define __NR_fallocate 47
> +      return gdb_sys_fallocate;
> +    case 48: // #define __NR_faccessat 48
> +      return gdb_sys_faccessat;
> +    case 49: // #define __NR_chdir 49
> +      return gdb_sys_chdir;
> +    case 50: // #define __NR_fchdir 50
> +      return gdb_sys_fchdir;
> +    case 51: // #define __NR_chroot 51
> +      return gdb_sys_chroot;
> +    case 52: // #define __NR_fchmod 52
> +      return gdb_sys_fchmod;
> +    case 53: // #define __NR_fchmodat 53
> +      return gdb_sys_fchmodat;
> +    case 54: // #define __NR_fchownat 54
> +      return gdb_sys_fchownat;
> +    case 55: // #define __NR_fchown 55
> +      return gdb_sys_fchown;
> +    case 56: // #define __NR_openat 56
> +      return gdb_sys_openat;
> +    case 57: // #define __NR_close 57
> +      return gdb_sys_close;
> +    case 58: // #define __NR_vhangup 58
> +      return gdb_sys_vhangup;
> +    case 59: // #define __NR_pipe2 59
> +      return gdb_sys_pipe2;
> +    case 60: // #define __NR_quotactl 60
> +      return gdb_sys_quotactl;
> +    case 61: // #define __NR_getdents64 61
> +      return gdb_sys_getdents64;
> +    case 62: // #define __NR_lseek 62
> +      return gdb_sys_lseek;
> +    case 63: // #define __NR_read 63
> +      return gdb_sys_read;
> +    case 64: // #define __NR_write 64
> +      return gdb_sys_write;
> +    case 65: // #define __NR_readv 65
> +      return gdb_sys_readv;
> +    case 66: // #define __NR_writev 66
> +      return gdb_sys_writev;
> +    case 67: // #define __NR_pread64 67
> +      return gdb_sys_pread64;
> +    case 68: // #define __NR_pwrite64 68
> +      return gdb_sys_pwrite64;
> +    // case 69: return gdb_sys_preadv;
> +    // case 70: return gdb_sys_pwritev;
> +    case 71: // #define __NR_sendfile 71
> +      return gdb_sys_sendfile;
> +    case 72: // #define __NR_pselect6 72
> +      return gdb_sys_pselect6;
> +    case 73: // #define __NR_ppoll 73
> +      return gdb_sys_ppoll;
> +    // case 74: return gdb_sys_signalfd4;
> +    case 75: // #define __NR_vmsplice 75
> +      return gdb_sys_vmsplice;
> +    case 76: // #define __NR_splice 76
> +      return gdb_sys_splice;
> +    case 77: // #define __NR_tee 77
> +      return gdb_sys_tee;
> +    case 78: // #define __NR_readlinkat 78
> +      return gdb_sys_readlinkat;
> +    case 79: // #define __NR_newfstatat 79
> +      return gdb_sys_newfstatat;
> +    case 80: // #define __NR_fstat 80
> +      return gdb_sys_fstat;
> +    case 81: // #define __NR_sync 81
> +      return gdb_sys_sync;
> +    case 82: // #define __NR_fsync 82
> +      return gdb_sys_fsync;
> +    case 83: // #define __NR_fdatasync 83
> +      return gdb_sys_fdatasync;
> +    case 84: // #define __NR_sync_file_range 84
> +      return gdb_sys_sync_file_range;
> +    // case 85: return gdb_sys_timerfd_create;
> +    // case 86: return gdb_sys_timerfd_settime;
> +    // case 87: return gdb_sys_timerfd_gettime;
> +    // case 88: return gdb_sys_utimensat;
> +    case 89: // #define __NR_acct 89
> +      return gdb_sys_acct;
> +    case 90: // #define __NR_capget 90
> +      return gdb_sys_capget;
> +    case 91: // #define __NR_capset 91
> +      return gdb_sys_capset;
> +    case 92: // #define __NR_personality 92
> +      return gdb_sys_personality;
> +    case 93: // #define __NR_exit 93
> +      return gdb_sys_exit;
> +    case 94: // #define __NR_exit_group 94
> +      return gdb_sys_exit_group;
> +    case 95: // #define __NR_waitid 95
> +      return gdb_sys_waitid;
> +    case 96: // #define __NR_set_tid_address 96
> +      return gdb_sys_set_tid_address;
> +    case 97: // #define __NR_unshare 97
> +      return gdb_sys_unshare;
> +    case 98: // #define __NR_futex 98
> +      return gdb_sys_futex;
> +    case 99: // #define __NR_set_robust_list 99
> +      return gdb_sys_set_robust_list;
> +    case 100: // #define __NR_get_robust_list 100
> +      return gdb_sys_get_robust_list;
> +    case 101: // #define __NR_nanosleep 101
> +      return gdb_sys_nanosleep;
> +    case 102: // #define __NR_getitimer 102
> +      return gdb_sys_getitimer;
> +    case 103: // #define __NR_setitimer 103
> +      return gdb_sys_setitimer;
> +    case 104: // #define __NR_kexec_load 104
> +      return gdb_sys_kexec_load;
> +    case 105: // #define __NR_init_module 105
> +      return gdb_sys_init_module;
> +    case 106: // #define __NR_delete_module 106
> +      return gdb_sys_delete_module;
> +    case 107: // #define __NR_timer_create 107
> +      return gdb_sys_timer_create;
> +    case 108: // #define __NR_timer_gettime 108
> +      return gdb_sys_timer_gettime;
> +    case 109: // #define __NR_timer_getoverrun 109
> +      return gdb_sys_timer_getoverrun;
> +    case 110: // #define __NR_timer_settime 110
> +      return gdb_sys_timer_settime;
> +    case 111: // #define __NR_timer_delete 111
> +      return gdb_sys_timer_delete;
> +    case 112: // #define __NR_clock_settime 112
> +      return gdb_sys_clock_settime;
> +    case 113: // #define __NR_clock_gettime 113
> +      return gdb_sys_clock_gettime;
> +    case 114: // #define __NR_clock_getres 114
> +      return gdb_sys_clock_getres;
> +    case 115: // #define __NR_clock_nanosleep 115
> +      return gdb_sys_clock_nanosleep;
> +    case 116: // #define __NR_syslog 116
> +      return gdb_sys_syslog;
> +    case 117: // #define __NR_ptrace 117
> +      return gdb_sys_ptrace;
> +    case 118: // #define __NR_sched_setparam 118
> +      return gdb_sys_sched_setparam;
> +    case 119: // #define __NR_sched_setscheduler 119
> +      return gdb_sys_sched_setscheduler;
> +    case 120: // #define __NR_sched_getscheduler 120
> +      return gdb_sys_sched_getscheduler;
> +    case 121: // #define __NR_sched_getparam 121
> +      return gdb_sys_sched_getparam;
> +    case 122: // #define __NR_sched_setaffinity 122
> +      return gdb_sys_sched_setaffinity;
> +    case 123: // #define __NR_sched_getaffinity 123
> +      return gdb_sys_sched_getaffinity;
> +    case 124: // #define __NR_sched_yield 124
> +      return gdb_sys_sched_yield;
> +    case 125: // #define __NR_sched_get_priority_max 125
> +      return gdb_sys_sched_get_priority_max;
> +    case 126: // #define __NR_sched_get_priority_min 126
> +      return gdb_sys_sched_get_priority_min;
> +    case 127: // #define __NR_sched_rr_get_interval 127
> +      return gdb_sys_sched_rr_get_interval;
> +    case 128: // #define __NR_restart_syscall 128
> +      return gdb_sys_restart_syscall;
> +    case 129: // #define __NR_kill 129
> +      return gdb_sys_kill;
> +    case 130: // #define __NR_tkill 130
> +      return gdb_sys_tkill;
> +    case 131: // #define __NR_tgkill 131
> +      return gdb_sys_tgkill;
> +    case 132: // #define __NR_sigaltstack 132
> +      return gdb_sys_sigaltstack;
> +    case 133: // #define __NR_rt_sigsuspend 133
> +      return gdb_sys_rt_sigsuspend;
> +    case 134: // #define __NR_rt_sigaction 134
> +      return gdb_sys_rt_sigaction;
> +    case 135: // #define __NR_rt_sigprocmask 135
> +      return gdb_sys_rt_sigprocmask;
> +    case 136: // #define __NR_rt_sigpending 136
> +      return gdb_sys_rt_sigpending;
> +    case 137: // #define __NR_rt_sigtimedwait 137
> +      return gdb_sys_rt_sigtimedwait;
> +    case 138: // #define __NR_rt_sigqueueinfo 138
> +      return gdb_sys_rt_sigqueueinfo;
> +    case 139: // #define __NR_rt_sigreturn 139
> +      return gdb_sys_rt_sigreturn;
> +    case 140: // #define __NR_setpriority 140
> +      return gdb_sys_setpriority;
> +    case 141: // #define __NR_getpriority 141
> +      return gdb_sys_getpriority;
> +    case 142: // #define __NR_reboot 142
> +      return gdb_sys_reboot;
> +    case 143: // #define __NR_setregid 143
> +      return gdb_sys_setregid;
> +    case 144: // #define __NR_setgid 144
> +      return gdb_sys_setgid;
> +    case 145: // #define __NR_setreuid 145
> +      return gdb_sys_setreuid;
> +    case 146: // #define __NR_setuid 146
> +      return gdb_sys_setuid;
> +    case 147: // #define __NR_setresuid 147
> +      return gdb_sys_setresuid;
> +    case 148: // #define __NR_getresuid 148
> +      return gdb_sys_getresuid;
> +    case 149: // #define __NR_setresgid 149
> +      return gdb_sys_setresgid;
> +    case 150: // #define __NR_getresgid 150
> +      return gdb_sys_getresgid;
> +    case 151: // #define __NR_setfsuid 151
> +      return gdb_sys_setfsuid;
> +    case 152: // #define __NR_setfsgid 152
> +      return gdb_sys_setfsgid;
> +    case 153: // #define __NR_times 153
> +      return gdb_sys_times;
> +    case 154: // #define __NR_setpgid 154
> +      return gdb_sys_setpgid;
> +    case 155: // #define __NR_getpgid 155
> +      return gdb_sys_getpgid;
> +    case 156: // #define __NR_getsid 156
> +      return gdb_sys_getsid;
> +    case 157: // #define __NR_setsid 157
> +      return gdb_sys_setsid;
> +    case 158: // #define __NR_getgroups 158
> +      return gdb_sys_getgroups;
> +    case 159: // #define __NR_setgroups 159
> +      return gdb_sys_setgroups;
> +    case 160: // #define __NR_uname 160
> +      return gdb_sys_uname;
> +    case 161: // #define __NR_sethostname 161
> +      return gdb_sys_sethostname;
> +    case 162: // #define __NR_setdomainname 162
> +      return gdb_sys_setdomainname;
> +    case 163: // #define __NR_getrlimit 163
> +      return gdb_sys_getrlimit;
> +    case 164: // #define __NR_setrlimit 164
> +      return gdb_sys_setrlimit;
> +    case 165: // #define __NR_getrusage 165
> +      return gdb_sys_getrusage;
> +    case 166: // #define __NR_umask 166
> +      return gdb_sys_umask;
> +    case 167: // #define __NR_prctl 167
> +      return gdb_sys_prctl;
> +    case 168: // #define __NR_getcpu 168
> +      return gdb_sys_getcpu;
> +    case 169: // #define __NR_gettimeofday 169
> +      return gdb_sys_gettimeofday;
> +    case 170: // #define __NR_settimeofday 170
> +      return gdb_sys_settimeofday;
> +    case 171: // #define __NR_adjtimex 171
> +      return gdb_sys_adjtimex;
> +    case 172: // #define __NR_getpid 172
> +      return gdb_sys_getpid;
> +    case 173: // #define __NR_getppid 173
> +      return gdb_sys_getppid;
> +    case 174: // #define __NR_getuid 174
> +      return gdb_sys_getuid;
> +    case 175: // #define __NR_geteuid 175
> +      return gdb_sys_geteuid;
> +    case 176: // #define __NR_getgid 176
> +      return gdb_sys_getgid;
> +    case 177: // #define __NR_getegid 177
> +      return gdb_sys_getegid;
> +    case 178: // #define __NR_gettid 178
> +      return gdb_sys_gettid;
> +    case 179: // #define __NR_sysinfo 179
> +      return gdb_sys_sysinfo;
> +    case 180: // #define __NR_mq_open 180
> +      return gdb_sys_mq_open;
> +    case 181: // #define __NR_mq_unlink 181
> +      return gdb_sys_mq_unlink;
> +    case 182: // #define __NR_mq_timedsend 182
> +      return gdb_sys_mq_timedsend;
> +    case 183: // #define __NR_mq_timedreceive 183
> +      return gdb_sys_mq_timedreceive;
> +    case 184: // #define __NR_mq_notify 184
> +      return gdb_sys_mq_notify;
> +    case 185: // #define __NR_mq_getsetattr 185
> +      return gdb_sys_mq_getsetattr;
> +    case 186: // #define __NR_msgget 186
> +      return gdb_sys_msgget;
> +    case 187: // #define __NR_msgctl 187
> +      return gdb_sys_msgctl;
> +    case 188: // #define __NR_msgrcv 188
> +      return gdb_sys_msgrcv;
> +    case 189: // #define __NR_msgsnd 189
> +      return gdb_sys_msgsnd;
> +    case 190: // #define __NR_semget 190
> +      return gdb_sys_semget;
> +    case 191: // #define __NR_semctl 191
> +      return gdb_sys_semctl;
> +    case 192: // #define __NR_semtimedop 192
> +      return gdb_sys_semtimedop;
> +    case 193: // #define __NR_semop 193
> +      return gdb_sys_semop;
> +    case 194: // #define __NR_shmget 194
> +      return gdb_sys_shmget;
> +    case 195: // #define __NR_shmctl 195
> +      return gdb_sys_shmctl;
> +    case 196: // #define __NR_shmat 196
> +      return gdb_sys_shmat;
> +    case 197: // #define __NR_shmdt 197
> +      return gdb_sys_shmdt;
> +    case 198: // #define __NR_socket 198
> +      return gdb_sys_socket;
> +    case 199: // #define __NR_socketpair 199
> +      return gdb_sys_socketpair;
> +    case 200: // #define __NR_bind 200
> +      return gdb_sys_bind;
> +    case 201: // #define __NR_listen 201
> +      return gdb_sys_listen;
> +    case 202: // #define __NR_accept 202
> +      return gdb_sys_accept;
> +    case 203: // #define __NR_connect 203
> +      return gdb_sys_connect;
> +    case 204: // #define __NR_getsockname 204
> +      return gdb_sys_getsockname;
> +    case 205: // #define __NR_getpeername 205
> +      return gdb_sys_getpeername;
> +    case 206: // #define __NR_sendto 206
> +      return gdb_sys_sendto;
> +    case 207: // #define __NR_recvfrom 207
> +      return gdb_sys_recvfrom;
> +    case 208: // #define __NR_setsockopt 208
> +      return gdb_sys_setsockopt;
> +    case 209: // #define __NR_getsockopt 209
> +      return gdb_sys_getsockopt;
> +    case 210: // #define __NR_shutdown 210
> +      return gdb_sys_shutdown;
> +    case 211: // #define __NR_sendmsg 211
> +      return gdb_sys_sendmsg;
> +    case 212: // #define __NR_recvmsg 212
> +      return gdb_sys_recvmsg;
> +    case 213: // #define __NR_readahead 213
> +      return gdb_sys_readahead;
> +    case 214: // #define __NR_brk 214
> +      return gdb_sys_brk;
> +    case 215: // #define __NR_munmap 215
> +      return gdb_sys_munmap;
> +    case 216: // #define __NR_mremap 216
> +      return gdb_sys_mremap;
> +    case 217: // #define __NR_add_key 217
> +      return gdb_sys_add_key;
> +    case 218: // #define __NR_request_key 218
> +      return gdb_sys_request_key;
> +    case 219: // #define __NR_keyctl 219
> +      return gdb_sys_keyctl;
> +    case 220: // #define __NR_clone 220
> +      return gdb_sys_clone;
> +    case 221: // #define __NR_execve 221
> +      return gdb_sys_execve;
> +    case 222:
> +      return gdb_old_mmap;
> +    case 223: // #define __NR_fadvise64 223
> +      return gdb_sys_fadvise64;
> +    case 224: // #define __NR_swapon 224
> +      return gdb_sys_swapon;
> +    case 225: // #define __NR_swapoff 225
> +      return gdb_sys_swapoff;
> +    case 226: // #define __NR_mprotect 226
> +      return gdb_sys_mprotect;
> +    case 227: // #define __NR_msync 227
> +      return gdb_sys_msync;
> +    case 228: // #define __NR_mlock 228
> +      return gdb_sys_mlock;
> +    case 229: // #define __NR_munlock 229
> +      return gdb_sys_munlock;
> +    case 230: // #define __NR_mlockall 230
> +      return gdb_sys_mlockall;
> +    case 231: // #define __NR_munlockall 231
> +      return gdb_sys_munlockall;
> +    case 232: // #define __NR_mincore 232
> +      return gdb_sys_mincore;
> +    case 233: // #define __NR_madvise 233
> +      return gdb_sys_madvise;
> +    case 234: // #define __NR_remap_file_pages 234
> +      return gdb_sys_remap_file_pages;
> +    case 235: // #define __NR_mbind 235
> +      return gdb_sys_mbind;
> +    case 236: // #define __NR_get_mempolicy 236
> +      return gdb_sys_get_mempolicy;
> +    case 237: // #define __NR_set_mempolicy 237
> +      return gdb_sys_set_mempolicy;
> +    case 238: // #define __NR_migrate_pages 238
> +      return gdb_sys_migrate_pages;
> +    case 239: // #define __NR_move_pages 239
> +      return gdb_sys_move_pages;
> +    // case 240: return gdb_sys_rt_tgsigqueueinfo;
> +    // case 241: return gdb_sys_perf_event_open;
> +    // case 242: return gdb_sys_accept4;
> +    // case 243: return gdb_sys_recvmmsg;
> +    // case 258: return gdb_sys_riscv_hwprobe;
> +    // case 259: return gdb_sys_riscv_flush_icache;
> +    case 260: // #define __NR_wait4 260
> +      return gdb_sys_wait4;
> +    // case 261: return gdb_sys_prlimit64;
> +    // case 262: return gdb_sys_fanotify_init;
> +    // case 263: return gdb_sys_fanotify_mark;
> +    // case 264: return gdb_sys_name_to_handle_at;
> +    // case 265: return gdb_sys_open_by_handle_at;
> +    // case 266: return gdb_sys_clock_adjtime;
> +    // case 267: return gdb_sys_syncfs;
> +    // case 268: return gdb_sys_setns;
> +    // case 269: return gdb_sys_sendmmsg;
> +    // case 270: return gdb_sys_process_vm_readv;
> +    // case 271: return gdb_sys_process_vm_writev;
> +    // case 272: return gdb_sys_kcmp;
> +    // case 273: return gdb_sys_finit_module;
> +    // case 274: return gdb_sys_sched_setattr;
> +    // case 275: return gdb_sys_sched_getattr;
> +    // case 276: return gdb_sys_renameat2;
> +    // case 277: return gdb_sys_seccomp;
> +    case 278: // #define __NR_getrandom 278
> +      return gdb_sys_getrandom;
> +    // case 279: return gdb_sys_memfd_create;
> +    // case 280: return gdb_sys_bpf;
> +    // case 281: return gdb_sys_execveat;
> +    // case 282: return gdb_sys_userfaultfd;
> +    // case 283: return gdb_sys_membarrier;
> +    // case 284: return gdb_sys_mlock2;
> +    // case 285: return gdb_sys_copy_file_range;
> +    // case 286: return gdb_sys_preadv2;
> +    // case 287: return gdb_sys_pwritev2;
> +    // case 288: return gdb_sys_pkey_mprotect;
> +    // case 289: return gdb_sys_pkey_alloc;
> +    // case 290: return gdb_sys_pkey_free;
> +    case 291: // #define __NR_statx 291
> +      return gdb_sys_statx;
> +    // case 292: return gdb_sys_io_pgetevents;
> +    // case 293: return gdb_sys_rseq;
> +    // case 294: return gdb_sys_kexec_file_load;
> +    // case 424: return gdb_sys_pidfd_send_signal;
> +    // case 425: return gdb_sys_io_uring_setup;
> +    // case 426: return gdb_sys_io_uring_enter;
> +    // case 427: return gdb_sys_io_uring_register;
> +    // case 428: return gdb_sys_open_tree;
> +    // case 429: return gdb_sys_move_mount;
> +    // case 430: return gdb_sys_fsopen;
> +    // case 431: return gdb_sys_fsconfig;
> +    // case 432: return gdb_sys_fsmount;
> +    // case 433: return gdb_sys_fspick;
> +    // case 434: return gdb_sys_pidfd_open;
> +    // case 435: return gdb_sys_clone3;
> +    // case 436: return gdb_sys_close_range;
> +    // case 437: return gdb_sys_openat2;
> +    // case 438: return gdb_sys_pidfd_getfd;
> +    // case 439: return gdb_sys_faccessat2;
> +    // case 440: return gdb_sys_process_madvise;
> +    // case 441: return gdb_sys_epoll_pwait2;
> +    // case 442: return gdb_sys_mount_setattr;
> +    // case 443: return gdb_sys_quotactl_fd;
> +    // case 444: return gdb_sys_landlock_create_ruleset;
> +    // case 445: return gdb_sys_landlock_add_rule;
> +    // case 446: return gdb_sys_landlock_restrict_self;
> +    // case 447: return gdb_sys_memfd_secret;
> +    // case 448: return gdb_sys_process_mrelease;
> +    // case 449: return gdb_sys_futex_waitv;
> +    // case 450: return gdb_sys_set_mempolicy_home_node;
> +    default:
> +      return gdb_sys_no_syscall;
> +    }
> +}
> diff --git a/gdb/riscv-linux-tdep.c b/gdb/riscv-linux-tdep.c
> index ff478cf4c28..5a56e9911f8 100644
> --- a/gdb/riscv-linux-tdep.c
> +++ b/gdb/riscv-linux-tdep.c
> @@ -25,6 +25,11 @@
>   #include "tramp-frame.h"
>   #include "trad-frame.h"
>   #include "gdbarch.h"
> +#include "record-full.h"
> +#include "linux-record.h"
> +#include "riscv-linux-tdep.h"
> +
> +extern unsigned int record_debug;
>   
>   /* The following value is derived from __NR_rt_sigreturn in
>      <include/uapi/asm-generic/unistd.h> from the Linux source tree.  */
> @@ -173,6 +178,259 @@ riscv_linux_syscall_next_pc (const frame_info_ptr &frame)
>     return pc + 4 /* Length of the ECALL insn.  */;
>   }
>   
> +/* RISC-V process record-replay constructs: syscall, signal etc.  */
> +
> +static linux_record_tdep riscv_linux_record_tdep;
> +
> +/* Record all registers but PC register for process-record.  */
> +
> +using regnum_type = int;
> +
> +static bool
> +save_registers (struct regcache *regcache, regnum_type fir, regnum_type last)
> +{
> +  for (regnum_type i = fir; i != last; ++i)
> +    if (record_full_arch_list_add_reg (regcache, i))
> +      return false;
> +  return true;
> +};
> +
> +static bool
> +riscv_all_but_pc_registers_record (struct regcache *regcache)
> +{
> +  auto &&gdbarch = regcache->arch ();
> +  auto &&tdep = gdbarch_tdep<riscv_gdbarch_tdep> (gdbarch);
> +  auto &&features = tdep->isa_features;
> +
> +  if (!save_registers (regcache, RISCV_ZERO_REGNUM + 1, RISCV_PC_REGNUM))
> +    return false;
> +
> +  if (features.flen
> +      && !save_registers (regcache, RISCV_FIRST_FP_REGNUM,
> +                          RISCV_LAST_FP_REGNUM + 1))
> +    return false;
> +
> +  // TODO: add saving vector registers
> +
> +  return true;
> +}
> +
> +/* Handler for riscv system call instruction recording.  */
> +
> +static int
> +riscv_linux_syscall_record (struct regcache *regcache,
> +                            unsigned long svc_number)
> +{
> +  auto syscall_gdb = riscv64_canonicalize_syscall (svc_number);
> +
> +  if (record_debug > 1)
> +    {
> +      gdb_printf (gdb_stdlog, "Made syscall %s.\n", plongest (svc_number));
> +    }
> +
> +  if (syscall_gdb == gdb_sys_no_syscall)
> +    {
> +      gdb_printf (gdb_stderr,
> +                  _ ("Process record and replay target doesn't "
> +                     "support syscall number %s\n"),
> +                  plongest (svc_number));
> +      return -1;
> +    }
> +
> +  if (syscall_gdb == gdb_sys_sigreturn || syscall_gdb == gdb_sys_rt_sigreturn)
> +    {
> +      if (!riscv_all_but_pc_registers_record (regcache))
> +        return -1;
> +      return 0;
> +    }
> +
> +  auto ret = record_linux_system_call (syscall_gdb, regcache,
> +                                       &riscv_linux_record_tdep);
> +  if (ret != 0)
> +    return ret;
> +
> +  /* Record the return value of the system call.  */
> +  if (record_full_arch_list_add_reg (regcache, RISCV_A0_REGNUM))
> +    return -1;
> +
> +  return 0;
> +}
> +
> +/* Initialize the riscv64_linux_record_tdep.  */
> +/* These values are the size of the type that will be used in a system
> +    call.  They are obtained from Linux Kernel source.  */
> +static void
> +riscv64_linux_record_tdep_init (
> +    struct gdbarch *gdbarch, struct linux_record_tdep &riscv_linux_record_tdep)
> +{
> +  riscv_linux_record_tdep.size_pointer
> +      = gdbarch_ptr_bit (gdbarch) / TARGET_CHAR_BIT;
> +  riscv_linux_record_tdep.size__old_kernel_stat
> +      = 48; // arch/powerpc/include/uapi/asm/stat.h: 2+2+2+2+2+2+2+2+8+8+8+8
> +  riscv_linux_record_tdep.size_tms = 32;
> +  riscv_linux_record_tdep.size_loff_t = 8;
> +  riscv_linux_record_tdep.size_flock = 32;
> +  riscv_linux_record_tdep.size_oldold_utsname
> +      = 45; // include/uapi/linux/utsname.h:7:9+9+9+9+9
> +  riscv_linux_record_tdep.size_ustat = 32;
> +  riscv_linux_record_tdep.size_old_sigaction
> +      = 32; // include/linux/signal_types.h:60:8+8+8+8
> +  riscv_linux_record_tdep.size_old_sigset_t
> +      = 8; // arch/powerpc/include/uapi/asm/signal.h:15
> +  riscv_linux_record_tdep.size_rlimit = 16;
> +  riscv_linux_record_tdep.size_rusage = 144;
> +  riscv_linux_record_tdep.size_timeval = 8; // include/uapi/linux/time.h:17:8+8
> +  riscv_linux_record_tdep.size_timezone = 8;
> +  riscv_linux_record_tdep.size_old_gid_t
> +      = 2; // arch/arm64/include/uapi/asm/posix_types.h:6
> +  riscv_linux_record_tdep.size_old_uid_t
> +      = 2; // arch/arm64/include/uapi/asm/posix_types.h:5
> +  riscv_linux_record_tdep.size_fd_set = 128;
> +  riscv_linux_record_tdep.size_old_dirent = 268; //?
> +  riscv_linux_record_tdep.size_statfs = 120;
> +  riscv_linux_record_tdep.size_statfs64 = 120;
> +  riscv_linux_record_tdep.size_sockaddr = 16;
> +  riscv_linux_record_tdep.size_int
> +      = gdbarch_int_bit (gdbarch) / TARGET_CHAR_BIT;
> +  riscv_linux_record_tdep.size_long
> +      = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
> +  riscv_linux_record_tdep.size_ulong
> +      = gdbarch_long_bit (gdbarch) / TARGET_CHAR_BIT;
> +  riscv_linux_record_tdep.size_msghdr = 104;
> +  riscv_linux_record_tdep.size_itimerval
> +      = 16; // include/uapi/linux/time.h:27:8+8
> +  riscv_linux_record_tdep.size_stat = 128;
> +  riscv_linux_record_tdep.size_old_utsname
> +      = 325; // include/uapi/linux/utsname.h:17:65+65+65+65+65
> +  riscv_linux_record_tdep.size_sysinfo = 112;
> +  riscv_linux_record_tdep.size_msqid_ds = 104;
> +  riscv_linux_record_tdep.size_shmid_ds = 88;
> +  riscv_linux_record_tdep.size_new_utsname = 390;
> +  riscv_linux_record_tdep.size_timex
> +      = 188; // include/uapi/linux/timex.h:65:4+8+8+8+8+4+8+8+8+8+8+8+8+4+8+8+8+8+8+4+11*4
> +  riscv_linux_record_tdep.size_mem_dqinfo = 72;
> +  riscv_linux_record_tdep.size_if_dqblk
> +      = 68; // include/uapi/linux/quota.h:111:8*8+4
> +  riscv_linux_record_tdep.size_fs_quota_stat
> +      = 64; // include/uapi/linux/dqblk_xfs.h:165:1+2+1+20+20+4+4+4+4+2+2
> +  riscv_linux_record_tdep.size_timespec
> +      = 16; // include/uapi/linux/time.h:11:8+8
> +  riscv_linux_record_tdep.size_pollfd = 8;
> +  riscv_linux_record_tdep.size_NFS_FHSIZE = 32; // include/uapi/linux/nfs.h:20
> +  riscv_linux_record_tdep.size_knfsd_fh = 36;   // fs/nfsd/nfsfh.h:47:4+32
> +  riscv_linux_record_tdep.size_TASK_COMM_LEN = 4;
> +  riscv_linux_record_tdep.size_sigaction = 24;
> +  riscv_linux_record_tdep.size_sigset_t = 8;
> +  riscv_linux_record_tdep.size_siginfo_t = 128;
> +  riscv_linux_record_tdep.size_cap_user_data_t = 8;
> +  riscv_linux_record_tdep.size_stack_t = 24;
> +  riscv_linux_record_tdep.size_off_t = riscv_linux_record_tdep.size_long;
> +  riscv_linux_record_tdep.size_stat64
> +      = 136; // include/uapi/asm-generic/stat.h:49:8+8+4+4+4+4+8+8+8+4+4+8+4+4+4+4+4+4+4+4
> +  riscv_linux_record_tdep.size_gid_t = 4;
> +  riscv_linux_record_tdep.size_uid_t = 4;
> +  riscv_linux_record_tdep.size_PAGE_SIZE = 4096;
> +  riscv_linux_record_tdep.size_flock64 = 32;
> +  riscv_linux_record_tdep.size_user_desc
> +      = 37; // arch/x86/include/uapi/asm/ldt.h:21:4*9+1
> +  riscv_linux_record_tdep.size_io_event = 32;
> +  riscv_linux_record_tdep.size_iocb = 64;
> +  riscv_linux_record_tdep.size_epoll_event = 16;
> +  riscv_linux_record_tdep.size_itimerspec
> +      = riscv_linux_record_tdep.size_timespec * 2;
> +  riscv_linux_record_tdep.size_mq_attr = 64;
> +  riscv_linux_record_tdep.size_termios = 36;
> +  riscv_linux_record_tdep.size_termios2 = 44;
> +  riscv_linux_record_tdep.size_pid_t = 4;
> +  riscv_linux_record_tdep.size_winsize = 8;
> +  riscv_linux_record_tdep.size_serial_struct = 72;
> +  riscv_linux_record_tdep.size_serial_icounter_struct = 80;
> +  riscv_linux_record_tdep.size_hayes_esp_config = 12;
> +  riscv_linux_record_tdep.size_size_t = 8;
> +  riscv_linux_record_tdep.size_iovec = 16;
> +  riscv_linux_record_tdep.size_time_t = 8; // tools/include/nolibc/std.h:34
> +
> +  riscv_linux_record_tdep.ioctl_TCGETS = 0x5401;
> +  riscv_linux_record_tdep.ioctl_TCSETS = 0x5402;
> +  riscv_linux_record_tdep.ioctl_TCSETSW = 0x5403;
> +  riscv_linux_record_tdep.ioctl_TCSETSF = 0x5404;
> +  riscv_linux_record_tdep.ioctl_TCGETA = 0x5405;
> +  riscv_linux_record_tdep.ioctl_TCSETA = 0x5406;
> +  riscv_linux_record_tdep.ioctl_TCSETAW = 0x5407;
> +  riscv_linux_record_tdep.ioctl_TCSETAF = 0x5408;
> +  riscv_linux_record_tdep.ioctl_TCSBRK = 0x5409;
> +  riscv_linux_record_tdep.ioctl_TCXONC = 0x540a;
> +  riscv_linux_record_tdep.ioctl_TCFLSH = 0x540b;
> +  riscv_linux_record_tdep.ioctl_TIOCEXCL = 0x540c;
> +  riscv_linux_record_tdep.ioctl_TIOCNXCL = 0x540d;
> +  riscv_linux_record_tdep.ioctl_TIOCSCTTY = 0x540e;
> +  riscv_linux_record_tdep.ioctl_TIOCGPGRP = 0x540f;
> +  riscv_linux_record_tdep.ioctl_TIOCSPGRP = 0x5410;
> +  riscv_linux_record_tdep.ioctl_TIOCOUTQ = 0x5411;
> +  riscv_linux_record_tdep.ioctl_TIOCSTI = 0x5412;
> +  riscv_linux_record_tdep.ioctl_TIOCGWINSZ = 0x5413;
> +  riscv_linux_record_tdep.ioctl_TIOCSWINSZ = 0x5414;
> +  riscv_linux_record_tdep.ioctl_TIOCMGET = 0x5415;
> +  riscv_linux_record_tdep.ioctl_TIOCMBIS = 0x5416;
> +  riscv_linux_record_tdep.ioctl_TIOCMBIC = 0x5417;
> +  riscv_linux_record_tdep.ioctl_TIOCMSET = 0x5418;
> +  riscv_linux_record_tdep.ioctl_TIOCGSOFTCAR = 0x5419;
> +  riscv_linux_record_tdep.ioctl_TIOCSSOFTCAR = 0x541a;
> +  riscv_linux_record_tdep.ioctl_FIONREAD = 0x541b;
> +  riscv_linux_record_tdep.ioctl_TIOCINQ
> +      = riscv_linux_record_tdep.ioctl_FIONREAD;
> +  riscv_linux_record_tdep.ioctl_TIOCLINUX = 0x541c;
> +  riscv_linux_record_tdep.ioctl_TIOCCONS = 0x541d;
> +  riscv_linux_record_tdep.ioctl_TIOCGSERIAL = 0x541e;
> +  riscv_linux_record_tdep.ioctl_TIOCSSERIAL = 0x541f;
> +  riscv_linux_record_tdep.ioctl_TIOCPKT = 0x5420;
> +  riscv_linux_record_tdep.ioctl_FIONBIO = 0x5421;
> +  riscv_linux_record_tdep.ioctl_TIOCNOTTY = 0x5422;
> +  riscv_linux_record_tdep.ioctl_TIOCSETD = 0x5423;
> +  riscv_linux_record_tdep.ioctl_TIOCGETD = 0x5424;
> +  riscv_linux_record_tdep.ioctl_TCSBRKP = 0x5425;
> +  riscv_linux_record_tdep.ioctl_TIOCTTYGSTRUCT = 0x5426;
> +  riscv_linux_record_tdep.ioctl_TIOCSBRK = 0x5427;
> +  riscv_linux_record_tdep.ioctl_TIOCCBRK = 0x5428;
> +  riscv_linux_record_tdep.ioctl_TIOCGSID = 0x5429;
> +  riscv_linux_record_tdep.ioctl_TCGETS2 = 0x802c542a;
> +  riscv_linux_record_tdep.ioctl_TCSETS2 = 0x402c542b;
> +  riscv_linux_record_tdep.ioctl_TCSETSW2 = 0x402c542c;
> +  riscv_linux_record_tdep.ioctl_TCSETSF2 = 0x402c542d;
> +  riscv_linux_record_tdep.ioctl_TIOCGPTN = 0x80045430;
> +  riscv_linux_record_tdep.ioctl_TIOCSPTLCK = 0x40045431;
> +  riscv_linux_record_tdep.ioctl_FIONCLEX = 0x5450;
> +  riscv_linux_record_tdep.ioctl_FIOCLEX = 0x5451;
> +  riscv_linux_record_tdep.ioctl_FIOASYNC = 0x5452;
> +  riscv_linux_record_tdep.ioctl_TIOCSERCONFIG = 0x5453;
> +  riscv_linux_record_tdep.ioctl_TIOCSERGWILD = 0x5454;
> +  riscv_linux_record_tdep.ioctl_TIOCSERSWILD = 0x5455;
> +  riscv_linux_record_tdep.ioctl_TIOCGLCKTRMIOS = 0x5456;
> +  riscv_linux_record_tdep.ioctl_TIOCSLCKTRMIOS = 0x5457;
> +  riscv_linux_record_tdep.ioctl_TIOCSERGSTRUCT = 0x5458;
> +  riscv_linux_record_tdep.ioctl_TIOCSERGETLSR = 0x5459;
> +  riscv_linux_record_tdep.ioctl_TIOCSERGETMULTI = 0x545a;
> +  riscv_linux_record_tdep.ioctl_TIOCSERSETMULTI = 0x545b;
> +  riscv_linux_record_tdep.ioctl_TIOCMIWAIT = 0x545c;
> +  riscv_linux_record_tdep.ioctl_TIOCGICOUNT = 0x545d;
> +  riscv_linux_record_tdep.ioctl_TIOCGHAYESESP = 0x545e;
> +  riscv_linux_record_tdep.ioctl_TIOCSHAYESESP = 0x545f;
> +  riscv_linux_record_tdep.ioctl_FIOQSIZE = 0x5460;
> +
> +  riscv_linux_record_tdep.fcntl_F_GETLK = 5;
> +  riscv_linux_record_tdep.fcntl_F_GETLK64 = 12;
> +  riscv_linux_record_tdep.fcntl_F_SETLK64 = 13;
> +  riscv_linux_record_tdep.fcntl_F_SETLKW64 = 14;
> +
> +  riscv_linux_record_tdep.arg1 = RISCV_A0_REGNUM;
> +  riscv_linux_record_tdep.arg2 = RISCV_A1_REGNUM;
> +  riscv_linux_record_tdep.arg3 = RISCV_A2_REGNUM;
> +  riscv_linux_record_tdep.arg4 = RISCV_A3_REGNUM;
> +  riscv_linux_record_tdep.arg5 = RISCV_A4_REGNUM;
> +  riscv_linux_record_tdep.arg6 = RISCV_A5_REGNUM;
> +  riscv_linux_record_tdep.arg7 = RISCV_A7_REGNUM;
> +}
> +
>   /* Initialize RISC-V Linux ABI info.  */
>   
>   static void
> @@ -205,6 +463,9 @@ riscv_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
>     tramp_frame_prepend_unwinder (gdbarch, &riscv_linux_sigframe);
>   
>     tdep->syscall_next_pc = riscv_linux_syscall_next_pc;
> +  tdep->riscv_syscall_record = riscv_linux_syscall_record;
> +
> +  riscv64_linux_record_tdep_init (gdbarch, riscv_linux_record_tdep);
>   }
>   
>   /* Initialize RISC-V Linux target support.  */
> diff --git a/gdb/riscv-linux-tdep.h b/gdb/riscv-linux-tdep.h
> new file mode 100644
> index 00000000000..5ee2c94387f
> --- /dev/null
> +++ b/gdb/riscv-linux-tdep.h
> @@ -0,0 +1,29 @@
> +/* Copyright (C) 2024 Free Software Foundation, Inc.
> +   Contributed by Timur Golubovich
I think we don't use these "contributed by" lines anymore.

> +
> +   This file is part of GDB.
> +
> +   This program is free software; you can redistribute it and/or modify
> +   it under the terms of the GNU General Public License as published by
> +   the Free Software Foundation; either version 3 of the License, or
> +   (at your option) any later version.
> +
> +   This program is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +   GNU General Public License for more details.
> +
> +   You should have received a copy of the GNU General Public License
> +   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
> +
> +#ifndef RISCV_LINUX_TDEP_H
> +#define RISCV_LINUX_TDEP_H
> +
> +#include "linux-record.h"
> +
> +/* riscv64_canonicalize_syscall maps from the native riscv Linux set
> +   of syscall ids into a canonical set of syscall ids used by
> +   process record.  */
> +extern enum gdb_syscall riscv64_canonicalize_syscall (int syscall);
> +
> +#endif /* RISCV_LINUX_TDEP_H */
> diff --git a/gdb/riscv-tdep.c b/gdb/riscv-tdep.c
> index 932708ca4e9..29013bc46c1 100644
> --- a/gdb/riscv-tdep.c
> +++ b/gdb/riscv-tdep.c
> @@ -54,9 +54,12 @@
>   #include "observable.h"
>   #include "prologue-value.h"
>   #include "arch/riscv.h"
> +#include "record-full.h"
>   #include "riscv-ravenscar-thread.h"
>   #include "gdbsupport/gdb-safe-ctype.h"
>   
> +#include <vector>
> +
>   /* The stack must be 16-byte aligned.  */
>   #define SP_ALIGNMENT 16
>   
> @@ -1655,6 +1658,11 @@ class riscv_insn
>     int imm_signed () const
>     { return m_imm.s; }
>   
> +  /* Fetch instruction from target memory at ADDR, return the content of
> +     the instruction, and update LEN with the instruction length.  */
> +  static ULONGEST fetch_instruction (struct gdbarch *gdbarch, CORE_ADDR addr,
> +                                     int *len);
> +
>   private:
>   
>     /* Extract 5 bit register field at OFFSET from instruction OPCODE.  */
> @@ -1800,11 +1808,6 @@ class riscv_insn
>       m_rs2 = decode_register_index_short (ival, OP_SH_CRS2S);
>     }
>   
> -  /* Fetch instruction from target memory at ADDR, return the content of
> -     the instruction, and update LEN with the instruction length.  */
> -  static ULONGEST fetch_instruction (struct gdbarch *gdbarch,
> -				     CORE_ADDR addr, int *len);
> -
>     /* The length of the instruction in bytes.  Should be 2 or 4.  */
>     int m_length;
>   
> @@ -4415,6 +4418,9 @@ riscv_gdbarch_init (struct gdbarch_info info,
>     set_gdbarch_stap_register_indirection_suffixes
>       (gdbarch, stap_register_indirection_suffixes);
>   
> +  /* Process record-replay */
> +  set_gdbarch_process_record (gdbarch, riscv_process_record);
> +
>     /* Hook in OS ABI-specific overrides, if they have been registered.  */
>     gdbarch_init_osabi (info, gdbarch);
>   
> @@ -4833,3 +4839,690 @@ this option can be used."),
>   				&setriscvcmdlist,
>   				&showriscvcmdlist);
>   }
> +
> +static bool
> +try_read (struct regcache *regcache, int regnum, ULONGEST &addr)
> +{
> +  gdb_assert (regcache);
> +
> +  if (regcache->raw_read<ULONGEST> (regnum, &addr)
> +      != register_status::REG_VALID)
> +    {
> +      warning (_ ("Can not read at address %lx"), addr);
> +      return false;
> +    }
> +  return true;
> +}
> +
> +class riscv_recorded_insn final
> +{
> +public:
> +  using regnum_type = int;
> +  using memory_type = std::pair<CORE_ADDR, int>;
> +
> +  enum class record_type
> +  {
> +    UNKNOWN,
> +    ORDINARY,
> +
> +    // corner cases
> +    ECALL,
> +    EBREAK,
> +  };
> +
> +private:
> +  using recorded_regs = std::vector<regnum_type>;
> +  using recorded_mems = std::vector<memory_type>;
> +
> +  using mem_addr = decltype (std::declval<memory_type> ().first);
> +  using mem_len = decltype (std::declval<memory_type> ().second);
> +
> +  record_type m_record_type = record_type::UNKNOWN;
> +
> +  bool m_error_occured = false;
> +
> +  recorded_regs m_regs;
> +  recorded_mems m_mems;
> +
> +  /* Helper for decode 16-bit instruction RS1. */
> +  static regnum_type
> +  decode_crs1_short (ULONGEST opcode) noexcept
> +  {
> +    return ((opcode >> OP_SH_CRS1S) & OP_MASK_CRS1S) + 8;
> +  }
> +
> +  /* Helper for decode 16-bit instruction RS2. */
> +  static regnum_type
> +  decode_crs2_short (ULONGEST opcode) noexcept
> +  {
> +    return ((opcode >> OP_SH_CRS2S) & OP_MASK_CRS2S) + 8;
> +  }
> +
> +  /* Helper for decode 16-bit instruction CRS1. */
> +  static regnum_type
> +  decode_crs1 (ULONGEST opcode) noexcept
> +  {
> +    return ((opcode >> OP_SH_RD) & OP_MASK_RD);
> +  }
> +
> +  /* Helper for decode 16-bit instruction CRS2. */
> +  static regnum_type
> +  decode_crs2 (ULONGEST opcode) noexcept
> +  {
> +    return ((opcode >> OP_SH_CRS2) & OP_MASK_CRS2);
> +  }
> +
> +  /* Helper for decode 32-bit instruction RD. */
> +  static regnum_type
> +  decode_rd (ULONGEST ival) noexcept
> +  {
> +    return (ival >> OP_SH_RD) & OP_MASK_RD;
> +  }
> +
> +  /* Helper for decode 32-bit instruction RS1. */
> +  static regnum_type
> +  decode_rs1 (ULONGEST ival) noexcept
> +  {
> +    return (ival >> OP_SH_RS1) & OP_MASK_RS1;
> +  }
> +
> +  /* Helper for decode 32-bit instruction RS2. */
> +  static regnum_type
> +  decode_rs2 (ULONGEST ival) noexcept
> +  {
> +    return (ival >> OP_SH_RS2) & OP_MASK_RS2;
> +  }
> +
> +  /* Helper for decode 32-bit instruction CSR. */
> +  static regnum_type
> +  decode_csr (ULONGEST ival) noexcept
> +  {
> +    return (ival >> OP_SH_CSR) & OP_MASK_CSR;
> +  }
> +
> +  bool
> +  set_ordinary_record_type () noexcept
> +  {
> +    m_record_type = record_type::ORDINARY;
> +    return true;
> +  }
> +
> +  bool
> +  set_error () noexcept
> +  {
> +    m_error_occured = true;
> +    return false;
> +  }
> +
> +  bool
> +  has_error () const noexcept
> +  {
> +    return m_error_occured;
> +  }
> +
> +  bool
> +  read_reg (struct regcache *regcache, regnum_type reg,
> +            ULONGEST &addr) noexcept
> +  {
> +    gdb_assert (regcache);
> +
> +    if (!try_read (regcache, reg, addr))
> +      {
> +        return set_error ();
> +      }
> +    return true;
> +  }
> +
> +  bool
> +  save_reg (regnum_type regnum) noexcept
> +  {
> +    try
> +      {
> +        m_regs.emplace_back (regnum);
> +        return true;
> +      }
> +    catch (const std::bad_alloc &ex)
> +      {
> +        warning (_ ("Exception was caught during reverse execution: %s"),
> +                 ex.what ());
> +        return set_error ();
> +      }
> +  }
> +
> +  bool
> +  save_mem (mem_addr addr, mem_len len) noexcept
> +  {
> +    try
> +      {
> +        m_mems.emplace_back (addr, len);
> +        return true;
> +      }
> +    catch (const std::bad_alloc &ex)
> +      {
> +        warning (_ ("Exception was caught during reverse execution: %s"),
> +                 ex.what ());
> +        return set_error ();
> +      }
> +  }
> +
> +  static bool
> +  need_save_pc (ULONGEST ival) noexcept
> +  {
> +    return is_beq_insn (ival) || is_bne_insn (ival) || is_blt_insn (ival)
> +           || is_bge_insn (ival) || is_bltu_insn (ival) || is_bgeu_insn (ival)
> +           || is_fence_insn (ival) || is_pause_insn (ival)
> +           || is_fence_i_insn (ival);
> +  }
> +
> +  /* Returns true if instruction is classified */
> +  bool
> +  try_save_pc (ULONGEST ival) noexcept
> +  {
> +    if (!need_save_pc (ival))
> +      return false;
> +
> +    return set_ordinary_record_type ();
> +  }
> +
> +  static bool
> +  need_save_pc_rd (ULONGEST ival) noexcept
> +  {
> +    return is_lui_insn (ival) || is_auipc_insn (ival) || is_jal_insn (ival)
> +           || is_jalr_insn (ival) || is_lb_insn (ival) || is_lh_insn (ival)
> +           || is_lw_insn (ival) || is_ld_insn (ival) || is_lbu_insn (ival)
> +           || is_lhu_insn (ival) || is_lb_insn (ival) || is_lh_insn (ival)
> +           || is_lw_insn (ival) || is_ld_insn (ival) || is_lbu_insn (ival)
> +           || is_lhu_insn (ival) || is_addi_insn (ival) || is_slti_insn (ival)
> +           || is_sltiu_insn (ival) || is_xori_insn (ival) || is_ori_insn (ival)
> +           || is_andi_insn (ival) || is_slli_insn (ival) || is_srli_insn (ival)
> +           || is_srai_insn (ival) || is_add_insn (ival) || is_sub_insn (ival)
> +           || is_sll_insn (ival) || is_slt_insn (ival) || is_sltu_insn (ival)
> +           || is_xor_insn (ival) || is_srl_insn (ival) || is_sra_insn (ival)
> +           || is_or_insn (ival) || is_and_insn (ival) || is_lwu_insn (ival)
> +           || is_addiw_insn (ival) || is_slliw_insn (ival)
> +           || is_srliw_insn (ival) || is_sraiw_insn (ival)
> +           || is_addw_insn (ival) || is_subw_insn (ival) || is_sllw_insn (ival)
> +           || is_srlw_insn (ival) || is_sraw_insn (ival) || is_mul_insn (ival)
> +           || is_mulh_insn (ival) || is_mulhsu_insn (ival)
> +           || is_mulhu_insn (ival) || is_div_insn (ival) || is_divu_insn (ival)
> +           || is_rem_insn (ival) || is_remu_insn (ival) || is_mulw_insn (ival)
> +           || is_divw_insn (ival) || is_divuw_insn (ival)
> +           || is_remw_insn (ival) || is_remuw_insn (ival)
> +           || is_lr_w_insn (ival) || is_lr_d_insn (ival)
> +           || is_fcvt_l_s_insn (ival) || is_fcvt_lu_s_insn (ival)
> +           || is_feq_d_insn (ival) || is_flt_d_insn (ival)
> +           || is_fle_d_insn (ival) || is_fclass_d_insn (ival)
> +           || is_fcvt_w_d_insn (ival) || is_fcvt_wu_d_insn (ival)
> +           || is_fcvt_d_w_insn (ival) || is_fcvt_l_d_insn (ival)
> +           || is_fcvt_lu_d_insn (ival) || is_fmv_x_d_insn (ival);
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
Comments should end in a period and 2 spaces.
> +  bool
> +  try_save_pc_rd (ULONGEST ival) noexcept
> +  {
> +    if (!need_save_pc_rd (ival))
> +      return false;
> +
> +    return !save_reg (decode_rd (ival)) || set_ordinary_record_type ();
> +  }
> +
> +  static bool
> +  need_save_pc_fprd (ULONGEST ival) noexcept
> +  {
> +    return is_fmadd_s_insn (ival) || is_fmsub_s_insn (ival)
> +           || is_fnmsub_s_insn (ival) || is_fnmadd_s_insn (ival)
> +           || is_fadd_s_insn (ival) || is_fsub_s_insn (ival)
> +           || is_fmul_s_insn (ival) || is_fdiv_s_insn (ival)
> +           || is_fsqrt_s_insn (ival) || is_fsgnj_s_insn (ival)
> +           || is_fsgnjn_s_insn (ival) || is_fsgnjx_s_insn (ival)
> +           || is_fmin_s_insn (ival) || is_fmax_s_insn (ival)
> +           || is_flw_insn (ival) || is_fld_insn (ival)
> +           || is_fcvt_s_w_insn (ival) || is_fcvt_s_wu_insn (ival)
> +           || is_fmv_s_x_insn (ival) || is_fcvt_s_l_insn (ival)
> +           || is_fcvt_s_lu_insn (ival) || is_fmadd_d_insn (ival)
> +           || is_fmsub_d_insn (ival) || is_fnmsub_d_insn (ival)
> +           || is_fnmadd_d_insn (ival) || is_fadd_d_insn (ival)
> +           || is_fsub_d_insn (ival) || is_fmul_d_insn (ival)
> +           || is_fdiv_d_insn (ival) || is_fsqrt_d_insn (ival)
> +           || is_fsgnj_d_insn (ival) || is_fsgnjn_d_insn (ival)
> +           || is_fsgnjx_d_insn (ival) || is_fmin_d_insn (ival)
> +           || is_fmax_d_insn (ival) || is_fcvt_s_d_insn (ival)
> +           || is_fcvt_d_s_insn (ival) || is_fcvt_d_wu_insn (ival)
> +           || is_fcvt_d_l_insn (ival) || is_fcvt_d_lu_insn (ival)
> +           || is_fmv_d_x_insn (ival);
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
> +  bool
> +  try_save_pc_fprd (ULONGEST ival) noexcept
> +  {
> +    if (!need_save_pc_fprd (ival))
> +      return false;
> +
> +    return !save_reg (RISCV_FIRST_FP_REGNUM + decode_rd (ival))
> +           || set_ordinary_record_type ();
> +  }
> +
> +  static bool
> +  need_save_pc_rd_csr (ULONGEST ival) noexcept
> +  {
> +    return is_csrrw_insn (ival) || is_csrrs_insn (ival) || is_csrrc_insn (ival)
> +           || is_csrrwi_insn (ival) || is_csrrsi_insn (ival)
> +           || is_csrrc_insn (ival);
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
> +  bool
> +  try_save_pc_rd_csr (ULONGEST ival) noexcept
> +  {
> +    if (!need_save_pc_rd_csr (ival))
> +      return false;
> +
> +    return !save_reg (decode_rd (ival))
> +           || !save_reg (RISCV_FIRST_CSR_REGNUM + decode_csr (ival))
> +           || set_ordinary_record_type ();
> +  }
> +
> +  /* If return value is > 0, than instruction needs saving memory len */
> +  static mem_len
> +  need_save_pc_mem (ULONGEST ival) noexcept
> +  {
> +    if (is_sb_insn (ival))
> +      return 1;
> +    if (is_sh_insn (ival))
> +      return 2;
> +    if (is_sw_insn (ival) || is_fsw_insn (ival))
> +      return 4;
> +    if (is_sd_insn (ival) || is_fsd_insn (ival))
> +      return 8;
> +    return 0;
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
> +  bool
> +  try_save_pc_mem (ULONGEST ival, struct regcache *regcache) noexcept
> +  {
> +    gdb_assert (regcache);
> +
> +    mem_addr addr = 0;
> +    auto len = need_save_pc_mem (ival);
> +    if (len <= 0)
> +      return false;
> +
> +    mem_len offset = EXTRACT_STYPE_IMM (ival);
> +    return !read_reg (regcache, decode_rs1 (ival), addr)
> +           || !save_mem (addr + offset, len) || set_ordinary_record_type ();
> +  }
> +
> +  /* If return value is > 0, than instruction needs saving memory len */
> +  static mem_len
> +  need_save_pc_rd_mem (ULONGEST ival) noexcept
> +  {
> +    if (is_sc_w_insn (ival) || is_amoadd_w_insn (ival)
> +        || is_amoxor_w_insn (ival) || is_amoand_w_insn (ival)
> +        || is_amoor_w_insn (ival) || is_amomin_w_insn (ival)
> +        || is_amomax_w_insn (ival) || is_amominu_w_insn (ival)
> +        || is_amomaxu_w_insn (ival))
> +      return 4;
> +    if (is_sc_d_insn (ival) || is_amoadd_d_insn (ival)
> +        || is_amoxor_d_insn (ival) || is_amoand_d_insn (ival)
> +        || is_amoor_d_insn (ival) || is_amomin_d_insn (ival)
> +        || is_amomax_d_insn (ival) || is_amominu_d_insn (ival)
> +        || is_amomaxu_d_insn (ival))
> +      return 8;
> +    return 0;
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
> +  bool
> +  try_save_pc_rd_mem (ULONGEST ival, struct regcache *regcache) noexcept
> +  {
> +    gdb_assert (regcache);
> +
> +    auto len = need_save_pc_rd_mem (ival);
> +    mem_addr addr = 0;
> +    if (len <= 0)
> +      return false;
> +
> +    return !read_reg (regcache, decode_rs1 (ival), addr)
> +           || !save_mem (addr, len) || !save_reg (decode_rd (ival))
> +           || set_ordinary_record_type ();
> +  }
> +
> +  /* If return value is > 0, than instruction needs saving memory len */
> +  static mem_len
> +  need_save_pc_rs2_rd_mem (ULONGEST ival) noexcept
> +  {
> +    if (is_amoswap_w_insn (ival))
> +      return 4;
> +    if (is_amoswap_d_insn (ival))
> +      return 8;
> +    return 0;
> +  }
> +
> +  /* Returns true if instruction is classified. Needs error checking after */
> +  bool
> +  try_save_pc_rs2_rd_mem (ULONGEST ival, struct regcache *regcache) noexcept
> +  {
> +    gdb_assert (regcache);
> +
> +    mem_addr addr = 0;
> +    auto len = need_save_pc_rs2_rd_mem (ival);
> +    if (len <= 0)
> +      return false;
> +
> +    return !read_reg (regcache, decode_rs1 (ival), addr)
> +           || !save_mem (addr, len) || !save_reg (decode_rs2 (ival))
> +           || !save_reg (decode_rd (ival)) || set_ordinary_record_type ();
> +  }
> +
> +  /* Returns true if instruction is successfully recorder.
> +     Else returns false */
> +  bool
> +  record_insn_len4 (ULONGEST ival, struct regcache *regcache) noexcept
> +  {
> +    gdb_assert (regcache);
> +
> +    if (is_ecall_insn (ival))
> +      {
> +        m_record_type = record_type::ECALL;
> +        return true;
> +      }
> +
> +    if (is_ebreak_insn (ival))
> +      {
> +        m_record_type = record_type::EBREAK;
> +        return true;
> +      }
> +
> +    if (try_save_pc (ival) || try_save_pc_rd (ival) || try_save_pc_fprd (ival)
> +        || try_save_pc_rd_csr (ival) || try_save_pc_mem (ival, regcache)
> +        || try_save_pc_rd_mem (ival, regcache)
> +        || try_save_pc_rs2_rd_mem (ival, regcache))
> +      {
> +        return !has_error ();
> +      }
> +
> +    warning (_ ("Currently this instruction with len 4(%lx) is unsupported"),
> +             ival);
> +    return false;
> +  }
> +
> +  /* Returns true if instruction is successfully recorder.
> +     Else returns false */
> +  bool
> +  record_insn_len2 (ULONGEST ival, struct regcache *regcache,
> +                    struct gdbarch *gdbarch) noexcept
> +  {
> +    gdb_assert (regcache);
> +    gdb_assert (gdbarch);
> +
> +    mem_addr addr = 0;
> +    auto xlen = riscv_isa_xlen (gdbarch);
> +
> +    /* The order here is very important, because
> +        opcodes of some instructions may be the same. */
> +
> +    if (is_c_addi4spn_insn (ival) || is_c_lw_insn (ival)
> +        || (xlen == 8 && is_c_ld_insn (ival)))
> +      {
> +        return !save_reg (decode_crs2_short (ival))
> +               || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_fld_insn (ival) || (xlen == 4 && is_c_flw_insn (ival)))
> +      {
> +        return !save_reg (RISCV_FIRST_FP_REGNUM + decode_crs2_short (ival))
> +               || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_fsd_insn (ival) || (xlen == 8 && is_c_sd_insn (ival)))
> +      {
> +        int offset = EXTRACT_CLTYPE_LD_IMM (ival);
> +        return !read_reg (regcache, decode_crs1_short (ival), addr)
> +               || !save_mem (addr + offset, 8) || set_ordinary_record_type ();
> +      }
> +
> +    if ((xlen == 4 && is_c_fsw_insn (ival)) || is_c_sw_insn (ival))
> +      {
> +        int offset = EXTRACT_CLTYPE_LW_IMM (ival);
> +        return !read_reg (regcache, decode_crs1_short (ival), addr)
> +               || !save_mem (addr + offset, 4) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_nop_insn (ival))
> +      {
> +        return set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_addi_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (xlen == 4 && is_c_jal_insn (ival))
> +      {
> +        return !save_reg (RISCV_RA_REGNUM) || set_ordinary_record_type ();
> +      }
> +
> +    if ((xlen == 8 && is_c_addiw_insn (ival)) || is_c_li_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_addi16sp_insn (ival))
> +      {
> +        return !save_reg (RISCV_SP_REGNUM) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_lui_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_srli_insn (ival) || is_c_srai_insn (ival) || is_c_andi_insn (ival)
> +        || is_c_sub_insn (ival) || is_c_xor_insn (ival) || is_c_or_insn (ival)
> +        || is_c_and_insn (ival) || (xlen == 8 && is_c_subw_insn (ival))
> +        || (xlen == 8 && is_c_addw_insn (ival)))
> +      {
> +        return !save_reg (decode_crs1_short (ival))
> +               || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_j_insn (ival) || is_c_beqz_insn (ival) || is_c_bnez_insn (ival))
> +      {
> +        return set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_slli_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_fldsp_insn (ival) || (xlen == 4 && is_c_flwsp_insn (ival)))
> +      {
> +        return !save_reg (RISCV_FIRST_FP_REGNUM + decode_crs1 (ival))
> +               || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_lwsp_insn (ival) || (xlen == 8 && is_c_ldsp_insn (ival)))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_jr_insn (ival))
> +      {
> +        return set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_mv_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_ebreak_insn (ival))
> +      {
> +        m_record_type = record_type::EBREAK;
> +        return true;
> +      }
> +
> +    if (is_c_jalr_insn (ival))
> +      {
> +        return !save_reg (RISCV_RA_REGNUM) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_add_insn (ival))
> +      {
> +        return !save_reg (decode_crs1 (ival)) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_fsdsp_insn (ival) || (xlen == 8 && is_c_sdsp_insn (ival)))
> +      {
> +        int offset = EXTRACT_CSSTYPE_SDSP_IMM (ival);
> +        return !read_reg (regcache, RISCV_SP_REGNUM, addr)
> +               || !save_mem (addr + offset, 8) || set_ordinary_record_type ();
> +      }
> +
> +    if (is_c_swsp_insn (ival) || (xlen == 4 && is_c_fswsp_insn (ival)))
> +      {
> +        int offset = EXTRACT_CSSTYPE_SWSP_IMM (ival);
> +        return !read_reg (regcache, RISCV_SP_REGNUM, addr)
> +               || !save_mem (addr + offset, 4) || set_ordinary_record_type ();
> +      }
> +
> +    warning (_ ("Currently this instruction with len 2(%lx) is unsupported"),
> +             ival);
> +    return false;
> +  }
> +
> +public:
> +  using regs_iter = recorded_regs::const_iterator;
> +  using mems_iter = recorded_mems::const_iterator;
> +
> +  bool
> +  record (gdbarch *gdbarch, struct regcache *regcache, CORE_ADDR addr) noexcept
> +  {
> +    int m_length = 0;
> +    auto ival = riscv_insn::fetch_instruction (gdbarch, addr, &m_length);
> +    if (!save_reg (RISCV_PC_REGNUM))
> +      return false;
> +
> +    if (m_length == 4)
> +      return record_insn_len4 (ival, regcache);
> +
> +    if (m_length == 2)
> +      return record_insn_len2 (ival, regcache, gdbarch);
> +
> +    /* 6 bytes or more.  If the instruction is longer than 8 bytes, we don't
> +have full instruction bits in ival.  At least, such long instructions
> +are not defined yet, so just ignore it.  */
Again, the indentation here is incorrect. Lines should start in the same 
column as the number 6.

-- 
Cheers,
Guinevere Larsen
She/Her/Hers

> +    gdb_assert (m_length > 0 && m_length % 2 == 0);
> +
> +    warning (_ ("Can not record unknown instruction (opcode = %lx)"), ival);
> +    return false;
> +  }
> +
> +  record_type
> +  get_record_type () const noexcept
> +  {
> +    return m_record_type;
> +  }
> +
> +  regs_iter
> +  regs_begin () const noexcept
> +  {
> +    return m_regs.begin ();
> +  }
> +
> +  regs_iter
> +  regs_end () const noexcept
> +  {
> +    return m_regs.end ();
> +  }
> +
> +  mems_iter
> +  mems_begin () const noexcept
> +  {
> +    return m_mems.begin ();
> +  }
> +
> +  mems_iter
> +  mems_end () const noexcept
> +  {
> +    return m_mems.end ();
> +  }
> +};
> +
> +static int
> +riscv_make_record_process (struct gdbarch *gdbarch, struct regcache *regcache,
> +                           const riscv_recorded_insn &insn)
> +{
> +  gdb_assert (gdbarch && regcache);
> +
> +  riscv_gdbarch_tdep *tdep = gdbarch_tdep<riscv_gdbarch_tdep> (gdbarch);
> +  auto regs_begin = insn.regs_begin ();
> +  auto regs_end = insn.regs_end ();
> +  if (std::any_of (regs_begin, regs_end, [&regcache] (auto &&reg_it) {
> +        return record_full_arch_list_add_reg (regcache, reg_it);
> +      }))
> +    return -1;
> +
> +  auto mems_begin = insn.mems_begin ();
> +  auto mems_end = insn.mems_end ();
> +  if (std::any_of (mems_begin, mems_end, [] (auto &&mem_it) {
> +        return record_full_arch_list_add_mem (mem_it.first, mem_it.second);
> +      }))
> +    return -1;
> +
> +  switch (insn.get_record_type ())
> +    {
> +    case riscv_recorded_insn::record_type::ORDINARY:
> +      break;
> +
> +    case riscv_recorded_insn::record_type::ECALL:
> +      {
> +        if (!tdep->riscv_syscall_record)
> +          {
> +            warning (_ ("Syscall record is not supported"));
> +            return -1;
> +          }
> +        ULONGEST reg_val = 0;
> +        if (!try_read (regcache, RISCV_A7_REGNUM, reg_val))
> +          {
> +            return -1;
> +          }
> +        return tdep->riscv_syscall_record (regcache, reg_val);
> +      }
> +
> +    case riscv_recorded_insn::record_type::EBREAK:
> +      break;
> +
> +    default:
> +      return -1;
> +    }
> +  return 0;
> +}
> +
> +int
> +riscv_process_record (struct gdbarch *gdbarch, struct regcache *regcache,
> +                      CORE_ADDR addr)
> +{
> +  gdb_assert (gdbarch && regcache);
> +
> +  riscv_recorded_insn insn;
> +  if (!insn.record (gdbarch, regcache, addr))
> +    {
> +      record_full_arch_list_add_end ();
> +      return -1;
> +    }
> +
> +  auto ret_val = riscv_make_record_process (gdbarch, regcache, insn);
> +
> +  if (record_full_arch_list_add_end ())
> +    {
> +      return -1;
> +    }
> +
> +  return ret_val;
> +}
> diff --git a/gdb/riscv-tdep.h b/gdb/riscv-tdep.h
> index 4bdc2e7a3d5..505371ba4f6 100644
> --- a/gdb/riscv-tdep.h
> +++ b/gdb/riscv-tdep.h
> @@ -35,6 +35,10 @@ enum
>     RISCV_FP_REGNUM = 8,		/* Frame Pointer.  */
>     RISCV_A0_REGNUM = 10,		/* First argument.  */
>     RISCV_A1_REGNUM = 11,		/* Second argument.  */
> +  RISCV_A2_REGNUM = 12,		/* Third argument.  */
> +  RISCV_A3_REGNUM = 13,		/* Forth argument.  */
> +  RISCV_A4_REGNUM = 14,		/* Fifth argument.  */
> +  RISCV_A5_REGNUM = 15,		/* Sixth argument.  */
>     RISCV_A7_REGNUM = 17,		/* Seventh argument.  */
>     RISCV_PC_REGNUM = 32,		/* Program Counter.  */
>   
> @@ -113,6 +117,11 @@ struct riscv_gdbarch_tdep : gdbarch_tdep_base
>     /* Return the expected next PC assuming FRAME is stopped at a syscall
>        instruction.  */
>     CORE_ADDR (*syscall_next_pc) (const frame_info_ptr &frame) = nullptr;
> +
> +  /* Syscall record.  */
> +  int (*riscv_syscall_record) (struct regcache *regcache,
> +                               unsigned long svc_number)
> +      = nullptr;
>   };
>   
>   
> @@ -177,6 +186,12 @@ extern void riscv_supply_regset (const struct regset *regset,
>   				  struct regcache *regcache, int regnum,
>   				  const void *regs, size_t len);
>   
> +/* Parse the current instruction, and record the values of the
> +   registers and memory that will be changed by the current
> +   instruction.  Returns -1 if something goes wrong, 0 otherwise.  */
> +extern int riscv_process_record (struct gdbarch *gdbarch,
> +                                 struct regcache *regcache, CORE_ADDR addr);
> +
>   /* The names of the RISC-V target description features.  */
>   extern const char *riscv_feature_name_csr;
>   
> diff --git a/gdb/syscalls/riscv-canonicalize-syscall-gen.py b/gdb/syscalls/riscv-canonicalize-syscall-gen.py
> new file mode 100644
> index 00000000000..235f858f5ff
> --- /dev/null
> +++ b/gdb/syscalls/riscv-canonicalize-syscall-gen.py
> @@ -0,0 +1,126 @@
> +#!/usr/bin/env python3
> +# pylint: disable=invalid-name
> +
> +# Copyright (C) 2024 Free Software Foundation, Inc.
> +# Contributed by Timur Golubovich
> +
> +# This file is part of GDB.
> +
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 3 of the License, or
> +# (at your option) any later version.
> +
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +import argparse
> +import re
> +import sys
> +from pathlib import Path as _Path
> +
> +head = """\
> +/* DO NOT EDIT: Autogenerated by riscv-canonicalize-syscall-gen.py  */
> +
> +#include "defs.h"
> +#include "riscv-linux-tdep.h"
> +
> +enum gdb_syscall
> +riscv64_canonicalize_syscall (int syscall)
> +{
> +  switch (syscall)
> +    {
> +"""
> +
> +tail = """\
> +    default:
> +      return gdb_sys_no_syscall;
> +    }
> +}
> +"""
> +
> +
> +class Generator:
> +    def _get_gdb_syscalls(self, gdb_syscalls_path: _Path) -> list[str]:
> +        gdb_syscalls: list[str] = []
> +        with open(gdb_syscalls_path, "r", encoding="UTF-8") as file:
> +            lines = file.readlines()
> +            for line in lines:
> +                match = re.search(r"\s*(?P<name>gdb_sys_[^S]+)\S*=", line)
> +                if match:
> +                    gdb_syscalls.append(match.group("name").strip())
> +        return gdb_syscalls
> +
> +    def _get_canon_syscalls_lines(self, syscalls_path: _Path, gdb_syscalls: list[str]) -> list[str]:
> +        canon_syscalls: dict[int, str] = {}
> +        with open(syscalls_path, "r", encoding="UTF-8") as file:
> +            lines = file.readlines()
> +            for line in lines:
> +                match = re.match(r"#define\s+__NR_(?P<name>[^\s]+)\s+(?P<number>\d+)", line)
> +                if match:
> +                    syscall_name = match.group("name")
> +                    syscall_num = int(match.group("number"))
> +                    gdb_syscall_name = f"gdb_sys_{syscall_name}"
> +                    if gdb_syscall_name in gdb_syscalls:
> +                        canon_syscalls[syscall_num] = (
> +                            f"    case {syscall_num}: // {line}      return {gdb_syscall_name};\n"
> +                        )
> +                    # this is a place for corner cases
> +                    elif syscall_name == "mmap":
> +                        gdb_old_syscall_name = "gdb_old_mmap"
> +                        canon_syscalls[syscall_num] = f"    case {syscall_num}:\n      return {gdb_old_syscall_name};\n"
> +                    else:
> +                        canon_syscalls[syscall_num] = f"    // case {syscall_num}: return {gdb_syscall_name};\n"
> +        return [canon_syscalls[syscall_num] for syscall_num in sorted(canon_syscalls)]
> +
> +    def generate(self, syscalls_path: _Path) -> None:
> +        repo_path = _Path(__file__).parent.parent.parent
> +        gdb_syscalls_path = repo_path / "gdb" / "linux-record.h"
> +        canon_syscalls_path = repo_path / "gdb" / "riscv-canonicalize-syscall.c"
> +
> +        gdb_syscalls = self._get_gdb_syscalls(gdb_syscalls_path)
> +        canon_syscalls_lines = self._get_canon_syscalls_lines(syscalls_path, gdb_syscalls)
> +
> +        with open(canon_syscalls_path, "w", encoding="UTF-8") as file:
> +            file.writelines(head)
> +            file.writelines(canon_syscalls_lines)
> +            file.writelines(tail)
> +
> +
> +help_message = """\
> +Generate file gdb/riscv-canonicalize-syscall.c
> +from path to riscv linux syscalls.
> +"""
> +
> +
> +def setup_parser() -> argparse.ArgumentParser:
> +    parser = argparse.ArgumentParser(description=help_message)
> +    parser.add_argument(
> +        "-i",
> +        "--input",
> +        type=_Path,
> +        required=True,
> +        help="path to riscv linux syscalls (riscv-glibc/sysdeps/unix/sysv/linux/riscv/rv64/arch-syscall.h)",
> +    )
> +    return parser
> +
> +
> +def main(argv: list[str]) -> int:
> +    try:
> +        parser = setup_parser()
> +        args = parser.parse_args(argv)
> +        generator = Generator()
> +        generator.generate(args.input)
> +        return 0
> +    except RuntimeError as e:
> +        print(str(e))
> +        return -1
> +
> +
> +if __name__ == "__main__":
> +    sys.exit(main(sys.argv[1:]))
> diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
> index 410f99e3350..b048ac7078b 100644
> --- a/gdb/testsuite/lib/gdb.exp
> +++ b/gdb/testsuite/lib/gdb.exp
> @@ -3718,7 +3718,8 @@ proc supports_reverse {} {
>            || [istarget "i\[34567\]86-*-linux*"]
>            || [istarget "aarch64*-*-linux*"]
>            || [istarget "powerpc*-*-linux*"]
> -         || [istarget "s390*-*-linux*"] } {
> +         || [istarget "s390*-*-linux*"]
> +         || [istarget "riscv*-*-*"] } {
>   	return 1
>       }
>   


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2024-11-15 22:26 [PATCH] gdb/riscv: Add record support for rv64gc instructions Timur
2024-11-18 19:46 ` Guinevere Larsen

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