Re: [PATCH v4 08/13] or1k: Linux Syscall Interface

[Stafford Horne <shorne@gmail.com>]

On Mon, Jan 03, 2022 at 03:21:58PM -0300, Adhemerval Zanella wrote:
> LGTM, thanks.
> 
> Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Thank you.

> On 29/12/2021 01:42, Stafford Horne via Libc-alpha wrote:
> > ---
> >  sysdeps/unix/sysv/linux/or1k/arch-syscall.h  | 325 +++++++++++++++++++
> >  sysdeps/unix/sysv/linux/or1k/clone.c         |  61 ++++
> >  sysdeps/unix/sysv/linux/or1k/mmap_internal.h |  28 ++
> >  sysdeps/unix/sysv/linux/or1k/or1k_clone.S    |  89 +++++
> >  sysdeps/unix/sysv/linux/or1k/sysdep.c        |  34 ++
> >  sysdeps/unix/sysv/linux/or1k/sysdep.h        | 201 ++++++++++++
> >  6 files changed, 738 insertions(+)
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/arch-syscall.h
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/clone.c
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/mmap_internal.h
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/or1k_clone.S
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/sysdep.c
> >  create mode 100644 sysdeps/unix/sysv/linux/or1k/sysdep.h
> > 
> > diff --git a/sysdeps/unix/sysv/linux/or1k/arch-syscall.h b/sysdeps/unix/sysv/linux/or1k/arch-syscall.h
> > new file mode 100644
> > index 0000000000..c6c3556137
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/arch-syscall.h
> > @@ -0,0 +1,325 @@
> > +/* AUTOGENERATED by update-syscall-lists.py.  */
> > +#define __NR_accept 202
> > +#define __NR_accept4 242
> > +#define __NR_acct 89
> > +#define __NR_add_key 217
> > +#define __NR_adjtimex 171
> > +#define __NR_bind 200
> > +#define __NR_bpf 280
> > +#define __NR_brk 214
> > +#define __NR_capget 90
> > +#define __NR_capset 91
> > +#define __NR_chdir 49
> > +#define __NR_chroot 51
> > +#define __NR_clock_adjtime 266
> > +#define __NR_clock_adjtime64 405
> > +#define __NR_clock_getres 114
> > +#define __NR_clock_getres_time64 406
> > +#define __NR_clock_gettime 113
> > +#define __NR_clock_gettime64 403
> > +#define __NR_clock_nanosleep 115
> > +#define __NR_clock_nanosleep_time64 407
> > +#define __NR_clock_settime 112
> > +#define __NR_clock_settime64 404
> > +#define __NR_clone 220
> > +#define __NR_clone3 435
> > +#define __NR_close 57
> > +#define __NR_close_range 436
> > +#define __NR_connect 203
> > +#define __NR_copy_file_range 285
> > +#define __NR_delete_module 106
> > +#define __NR_dup 23
> > +#define __NR_dup3 24
> > +#define __NR_epoll_create1 20
> > +#define __NR_epoll_ctl 21
> > +#define __NR_epoll_pwait 22
> > +#define __NR_epoll_pwait2 441
> > +#define __NR_eventfd2 19
> > +#define __NR_execve 221
> > +#define __NR_execveat 281
> > +#define __NR_exit 93
> > +#define __NR_exit_group 94
> > +#define __NR_faccessat 48
> > +#define __NR_faccessat2 439
> > +#define __NR_fadvise64_64 223
> > +#define __NR_fallocate 47
> > +#define __NR_fanotify_init 262
> > +#define __NR_fanotify_mark 263
> > +#define __NR_fchdir 50
> > +#define __NR_fchmod 52
> > +#define __NR_fchmodat 53
> > +#define __NR_fchown 55
> > +#define __NR_fchownat 54
> > +#define __NR_fcntl64 25
> > +#define __NR_fdatasync 83
> > +#define __NR_fgetxattr 10
> > +#define __NR_finit_module 273
> > +#define __NR_flistxattr 13
> > +#define __NR_flock 32
> > +#define __NR_fremovexattr 16
> > +#define __NR_fsconfig 431
> > +#define __NR_fsetxattr 7
> > +#define __NR_fsmount 432
> > +#define __NR_fsopen 430
> > +#define __NR_fspick 433
> > +#define __NR_fstat64 80
> > +#define __NR_fstatat64 79
> > +#define __NR_fstatfs64 44
> > +#define __NR_fsync 82
> > +#define __NR_ftruncate64 46
> > +#define __NR_futex 98
> > +#define __NR_futex_time64 422
> > +#define __NR_get_mempolicy 236
> > +#define __NR_get_robust_list 100
> > +#define __NR_getcpu 168
> > +#define __NR_getcwd 17
> > +#define __NR_getdents64 61
> > +#define __NR_getegid 177
> > +#define __NR_geteuid 175
> > +#define __NR_getgid 176
> > +#define __NR_getgroups 158
> > +#define __NR_getitimer 102
> > +#define __NR_getpeername 205
> > +#define __NR_getpgid 155
> > +#define __NR_getpid 172
> > +#define __NR_getppid 173
> > +#define __NR_getpriority 141
> > +#define __NR_getrandom 278
> > +#define __NR_getresgid 150
> > +#define __NR_getresuid 148
> > +#define __NR_getrlimit 163
> > +#define __NR_getrusage 165
> > +#define __NR_getsid 156
> > +#define __NR_getsockname 204
> > +#define __NR_getsockopt 209
> > +#define __NR_gettid 178
> > +#define __NR_gettimeofday 169
> > +#define __NR_getuid 174
> > +#define __NR_getxattr 8
> > +#define __NR_init_module 105
> > +#define __NR_inotify_add_watch 27
> > +#define __NR_inotify_init1 26
> > +#define __NR_inotify_rm_watch 28
> > +#define __NR_io_cancel 3
> > +#define __NR_io_destroy 1
> > +#define __NR_io_getevents 4
> > +#define __NR_io_pgetevents 292
> > +#define __NR_io_pgetevents_time64 416
> > +#define __NR_io_setup 0
> > +#define __NR_io_submit 2
> > +#define __NR_io_uring_enter 426
> > +#define __NR_io_uring_register 427
> > +#define __NR_io_uring_setup 425
> > +#define __NR_ioctl 29
> > +#define __NR_ioprio_get 31
> > +#define __NR_ioprio_set 30
> > +#define __NR_kcmp 272
> > +#define __NR_kexec_file_load 294
> > +#define __NR_kexec_load 104
> > +#define __NR_keyctl 219
> > +#define __NR_kill 129
> > +#define __NR_landlock_add_rule 445
> > +#define __NR_landlock_create_ruleset 444
> > +#define __NR_landlock_restrict_self 446
> > +#define __NR_lgetxattr 9
> > +#define __NR_linkat 37
> > +#define __NR_listen 201
> > +#define __NR_listxattr 11
> > +#define __NR_llistxattr 12
> > +#define __NR_llseek 62
> > +#define __NR_lookup_dcookie 18
> > +#define __NR_lremovexattr 15
> > +#define __NR_lsetxattr 6
> > +#define __NR_madvise 233
> > +#define __NR_mbind 235
> > +#define __NR_membarrier 283
> > +#define __NR_memfd_create 279
> > +#define __NR_migrate_pages 238
> > +#define __NR_mincore 232
> > +#define __NR_mkdirat 34
> > +#define __NR_mknodat 33
> > +#define __NR_mlock 228
> > +#define __NR_mlock2 284
> > +#define __NR_mlockall 230
> > +#define __NR_mmap2 222
> > +#define __NR_mount 40
> > +#define __NR_mount_setattr 442
> > +#define __NR_move_mount 429
> > +#define __NR_move_pages 239
> > +#define __NR_mprotect 226
> > +#define __NR_mq_getsetattr 185
> > +#define __NR_mq_notify 184
> > +#define __NR_mq_open 180
> > +#define __NR_mq_timedreceive 183
> > +#define __NR_mq_timedreceive_time64 419
> > +#define __NR_mq_timedsend 182
> > +#define __NR_mq_timedsend_time64 418
> > +#define __NR_mq_unlink 181
> > +#define __NR_mremap 216
> > +#define __NR_msgctl 187
> > +#define __NR_msgget 186
> > +#define __NR_msgrcv 188
> > +#define __NR_msgsnd 189
> > +#define __NR_msync 227
> > +#define __NR_munlock 229
> > +#define __NR_munlockall 231
> > +#define __NR_munmap 215
> > +#define __NR_name_to_handle_at 264
> > +#define __NR_nanosleep 101
> > +#define __NR_nfsservctl 42
> > +#define __NR_open_by_handle_at 265
> > +#define __NR_open_tree 428
> > +#define __NR_openat 56
> > +#define __NR_openat2 437
> > +#define __NR_or1k_atomic 244
> > +#define __NR_perf_event_open 241
> > +#define __NR_personality 92
> > +#define __NR_pidfd_getfd 438
> > +#define __NR_pidfd_open 434
> > +#define __NR_pidfd_send_signal 424
> > +#define __NR_pipe2 59
> > +#define __NR_pivot_root 41
> > +#define __NR_pkey_alloc 289
> > +#define __NR_pkey_free 290
> > +#define __NR_pkey_mprotect 288
> > +#define __NR_ppoll 73
> > +#define __NR_ppoll_time64 414
> > +#define __NR_prctl 167
> > +#define __NR_pread64 67
> > +#define __NR_preadv 69
> > +#define __NR_preadv2 286
> > +#define __NR_prlimit64 261
> > +#define __NR_process_madvise 440
> > +#define __NR_process_mrelease 448
> > +#define __NR_process_vm_readv 270
> > +#define __NR_process_vm_writev 271
> > +#define __NR_pselect6 72
> > +#define __NR_pselect6_time64 413
> > +#define __NR_ptrace 117
> > +#define __NR_pwrite64 68
> > +#define __NR_pwritev 70
> > +#define __NR_pwritev2 287
> > +#define __NR_quotactl 60
> > +#define __NR_quotactl_fd 443
> > +#define __NR_read 63
> > +#define __NR_readahead 213
> > +#define __NR_readlinkat 78
> > +#define __NR_readv 65
> > +#define __NR_reboot 142
> > +#define __NR_recvfrom 207
> > +#define __NR_recvmmsg 243
> > +#define __NR_recvmmsg_time64 417
> > +#define __NR_recvmsg 212
> > +#define __NR_remap_file_pages 234
> > +#define __NR_removexattr 14
> > +#define __NR_renameat 38
> > +#define __NR_renameat2 276
> > +#define __NR_request_key 218
> > +#define __NR_restart_syscall 128
> > +#define __NR_rseq 293
> > +#define __NR_rt_sigaction 134
> > +#define __NR_rt_sigpending 136
> > +#define __NR_rt_sigprocmask 135
> > +#define __NR_rt_sigqueueinfo 138
> > +#define __NR_rt_sigreturn 139
> > +#define __NR_rt_sigsuspend 133
> > +#define __NR_rt_sigtimedwait 137
> > +#define __NR_rt_sigtimedwait_time64 421
> > +#define __NR_rt_tgsigqueueinfo 240
> > +#define __NR_sched_get_priority_max 125
> > +#define __NR_sched_get_priority_min 126
> > +#define __NR_sched_getaffinity 123
> > +#define __NR_sched_getattr 275
> > +#define __NR_sched_getparam 121
> > +#define __NR_sched_getscheduler 120
> > +#define __NR_sched_rr_get_interval 127
> > +#define __NR_sched_rr_get_interval_time64 423
> > +#define __NR_sched_setaffinity 122
> > +#define __NR_sched_setattr 274
> > +#define __NR_sched_setparam 118
> > +#define __NR_sched_setscheduler 119
> > +#define __NR_sched_yield 124
> > +#define __NR_seccomp 277
> > +#define __NR_semctl 191
> > +#define __NR_semget 190
> > +#define __NR_semop 193
> > +#define __NR_semtimedop 192
> > +#define __NR_semtimedop_time64 420
> > +#define __NR_sendfile64 71
> > +#define __NR_sendmmsg 269
> > +#define __NR_sendmsg 211
> > +#define __NR_sendto 206
> > +#define __NR_set_mempolicy 237
> > +#define __NR_set_robust_list 99
> > +#define __NR_set_tid_address 96
> > +#define __NR_setdomainname 162
> > +#define __NR_setfsgid 152
> > +#define __NR_setfsuid 151
> > +#define __NR_setgid 144
> > +#define __NR_setgroups 159
> > +#define __NR_sethostname 161
> > +#define __NR_setitimer 103
> > +#define __NR_setns 268
> > +#define __NR_setpgid 154
> > +#define __NR_setpriority 140
> > +#define __NR_setregid 143
> > +#define __NR_setresgid 149
> > +#define __NR_setresuid 147
> > +#define __NR_setreuid 145
> > +#define __NR_setrlimit 164
> > +#define __NR_setsid 157
> > +#define __NR_setsockopt 208
> > +#define __NR_settimeofday 170
> > +#define __NR_setuid 146
> > +#define __NR_setxattr 5
> > +#define __NR_shmat 196
> > +#define __NR_shmctl 195
> > +#define __NR_shmdt 197
> > +#define __NR_shmget 194
> > +#define __NR_shutdown 210
> > +#define __NR_sigaltstack 132
> > +#define __NR_signalfd4 74
> > +#define __NR_socket 198
> > +#define __NR_socketpair 199
> > +#define __NR_splice 76
> > +#define __NR_statfs64 43
> > +#define __NR_statx 291
> > +#define __NR_swapoff 225
> > +#define __NR_swapon 224
> > +#define __NR_symlinkat 36
> > +#define __NR_sync 81
> > +#define __NR_sync_file_range 84
> > +#define __NR_syncfs 267
> > +#define __NR_sysinfo 179
> > +#define __NR_syslog 116
> > +#define __NR_tee 77
> > +#define __NR_tgkill 131
> > +#define __NR_timer_create 107
> > +#define __NR_timer_delete 111
> > +#define __NR_timer_getoverrun 109
> > +#define __NR_timer_gettime 108
> > +#define __NR_timer_gettime64 408
> > +#define __NR_timer_settime 110
> > +#define __NR_timer_settime64 409
> > +#define __NR_timerfd_create 85
> > +#define __NR_timerfd_gettime 87
> > +#define __NR_timerfd_gettime64 410
> > +#define __NR_timerfd_settime 86
> > +#define __NR_timerfd_settime64 411
> > +#define __NR_times 153
> > +#define __NR_tkill 130
> > +#define __NR_truncate64 45
> > +#define __NR_umask 166
> > +#define __NR_umount2 39
> > +#define __NR_uname 160
> > +#define __NR_unlinkat 35
> > +#define __NR_unshare 97
> > +#define __NR_userfaultfd 282
> > +#define __NR_utimensat 88
> > +#define __NR_utimensat_time64 412
> > +#define __NR_vhangup 58
> > +#define __NR_vmsplice 75
> > +#define __NR_wait4 260
> > +#define __NR_waitid 95
> > +#define __NR_write 64
> > +#define __NR_writev 66
> > diff --git a/sysdeps/unix/sysv/linux/or1k/clone.c b/sysdeps/unix/sysv/linux/or1k/clone.c
> > new file mode 100644
> > index 0000000000..531fd17e29
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/clone.c
> > @@ -0,0 +1,61 @@
> > +/* OpenRISC helper for the clone syscall.
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library 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
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library; if not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#include <stdarg.h>
> > +#include <sysdep.h>
> > +
> > +extern int __or1k_clone (int (*fn)(void *), void *child_stack,
> > +			 int flags, void *arg, pid_t *ptid,
> > +			 void *tls, pid_t *ctid);
> > +
> > +
> > +/* The OpenRISC ABI uses the stack for varargs like those using in clone
> > +   but the linux syscall ABI uses registers.
> > +   This function moves from varargs to regs.  */
> > +int
> > +__clone (int (*fn)(void *), void *child_stack,
> > +	 int flags, void *arg, ...
> > +	 /* pid_t *ptid, struct user_desc *tls, pid_t *ctid */ )
> > +{
> > +  void *ptid;
> > +  void *tls;
> > +  void *ctid;
> > +  va_list ap;
> > +  int err;
> > +
> > +  va_start (ap, arg);
> > +  ptid = va_arg (ap, void *);
> > +  tls = va_arg (ap, void *);
> > +  ctid = va_arg (ap, void *);
> > +  va_end (ap);
> > +
> > +  /* Sanity check the arguments */
> > +  err = -EINVAL;
> > +  if (!fn)
> > +    goto syscall_error;
> > +  if (!child_stack)
> > +    goto syscall_error;
> > +
> > +  return __or1k_clone (fn, child_stack, flags, arg, ptid, tls, ctid);
> > +
> > +syscall_error:
> > +  __set_errno (-err);
> > +  return -1;
> > +}
> > +libc_hidden_def (__clone)
> > +weak_alias (__clone, clone)
> > diff --git a/sysdeps/unix/sysv/linux/or1k/mmap_internal.h b/sysdeps/unix/sysv/linux/or1k/mmap_internal.h
> > new file mode 100644
> > index 0000000000..817b841e5b
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/mmap_internal.h
> > @@ -0,0 +1,28 @@
> > +/* Common mmap definition for Linux implementation.  OpenRISC version.
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library 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
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library; if not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#ifndef MMAP_OR1K_INTERNAL_LINUX_H
> > +#define MMAP_OR1K_INTERNAL_LINUX_H
> > +
> > +/* OpenRISC Linux sets the page shift to 13 and mmap2 expects
> > +   offsets to be provided in 8K pages.  */
> > +#define MMAP2_PAGE_UNIT 8192ULL
> > +
> > +#include_next <mmap_internal.h>
> > +
> > +#endif
> > diff --git a/sysdeps/unix/sysv/linux/or1k/or1k_clone.S b/sysdeps/unix/sysv/linux/or1k/or1k_clone.S
> > new file mode 100644
> > index 0000000000..1f1db1acb2
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/or1k_clone.S
> > @@ -0,0 +1,89 @@
> > +/* clone helper __or1k_clone for OpenRISC.
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library 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
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library; if not, write to the Free
> > +   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
> > +   02111-1307 USA.  */
> > +
> > +#include <sysdep.h>
> > +#include <tls.h>
> > +#define __ASSEMBLY__
> > +#include <linux/sched.h>
> > +
> > +	.text
> > +ENTRY (__or1k_clone)
> > +
> > +	/* To handle GCC varargs we need to use our __clone wrapper to pop
> > +	   everything from the stack for us.
> > +	   Now everything is placed in the registers which saves us a lot
> > +	   of trouble.
> > +
> > +	   The userland implementation is:
> > +
> > +	     int clone (int (*fn)(void *), void *child_stack,
> > +			int flags, void *arg, pid_t *ptid,
> > +			struct user_desc *tls, pid_t *ctid);
> > +	   The kernel entry is:
> > +
> > +	     int clone (long flags, void *child_stack, int *parent_tid,
> > +			int *child_tid, struct void *tls)
> > +
> > +	     NB: tls isn't really an argument, it is read from r7 directly.  */
> > +
> > +	/* First, align the stack to 4 bytes.  */
> > +	l.xori	r11, r0, -4
> > +	l.and	r4, r4, r11
> > +
> > +	/* Put 'fn', 'arg' and 'flags' on the child stack.  */
> > +	l.addi	r4, r4, -12
> > +	l.sw	8(r4), r3
> > +	l.sw	4(r4), r6
> > +	l.sw	0(r4), r5
> > +
> > +	l.ori	r3, r5, 0
> > +	/* The child_stack is already in r4.  */
> > +	l.ori	r5, r7, 0
> > +	l.lwz	r6, 0(r1)
> > +	l.ori	r7, r8, 0
> > +
> > +	DO_CALL (clone)
> > +
> > +	l.sfgeui r11, 0xf001
> > +	l.bf	L(error)
> > +	 l.nop
> > +
> > +	/* If we are not the child, return the pid.  */
> > +	l.sfeqi	r11, 0
> > +	l.bf	L(thread_start)
> > +	 l.nop
> > +
> > +	l.jr	r9
> > +	 l.nop
> > +
> > +L(thread_start):
> > +	/* Load function from stack.  */
> > +	l.lwz	r11, 8(r1)
> > +	l.jalr	r11
> > +	 l.lwz	r3, 4(r1)
> > +
> > +	/* Exit the child thread.  */
> > +	l.ori	r3, r11, 0
> > +	DO_CALL (exit)
> > +
> > +L(error):
> > +	l.j	SYSCALL_ERROR_NAME
> > +	 l.ori	r3, r11, 0
> > +
> > +END (__or1k_clone)
> > diff --git a/sysdeps/unix/sysv/linux/or1k/sysdep.c b/sysdeps/unix/sysv/linux/or1k/sysdep.c
> > new file mode 100644
> > index 0000000000..1130cba687
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/sysdep.c
> > @@ -0,0 +1,34 @@
> > +/* OpenRISC wrapper for setting errno.
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library 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
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library.  If not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#include <sysdep.h>
> > +#include <errno.h>
> > +
> > +long int __syscall_error (long int err);
> > +hidden_proto (__syscall_error)
> > +
> > +/* This routine is jumped to by all the syscall handlers, to stash
> > +   an error number into errno.  */
> > +long int
> > +__syscall_error (long int err)
> > +{
> > +  __set_errno (- err);
> > +  return -1;
> > +}
> > +hidden_def (__syscall_error)
> > diff --git a/sysdeps/unix/sysv/linux/or1k/sysdep.h b/sysdeps/unix/sysv/linux/or1k/sysdep.h
> > new file mode 100644
> > index 0000000000..5dd6da48a1
> > --- /dev/null
> > +++ b/sysdeps/unix/sysv/linux/or1k/sysdep.h
> > @@ -0,0 +1,201 @@
> > +/* Assembler and syscall macros.  OpenRISC version.
> > +   Copyright (C) 2021 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library 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
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library.  If not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#ifndef _LINUX_OR1K_SYSDEP_H
> > +#define _LINUX_OR1K_SYSDEP_H 1
> > +
> > +#include <sysdeps/or1k/sysdep.h>
> > +#include <sysdeps/unix/sysv/linux/generic/sysdep.h>
> > +#include <tls.h>
> > +
> > +/* "workarounds" for generic code needing to handle 64-bit time_t.  */
> > +
> > +#undef __NR_clock_getres
> > +#undef __NR_futex
> > +#undef __NR_ppoll
> > +#undef __NR_pselect6
> > +#undef __NR_recvmmsg
> > +#undef __NR_rt_sigtimedwait
> > +#undef __NR_semtimedop
> > +#undef __NR_utimensat
> > +
> > +/* Fix sysdeps/unix/sysv/linux/clock_getcpuclockid.c.  */
> > +#define __NR_clock_getres	__NR_clock_getres_time64
> > +/* Fix sysdeps/nptl/lowlevellock-futex.h.  */
> > +#define __NR_futex		__NR_futex_time64
> > +/* Fix sysdeps/unix/sysv/linux/pause.c.  */
> > +#define __NR_ppoll		__NR_ppoll_time64
> > +/* Fix sysdeps/unix/sysv/linux/select.c.  */
> > +#define __NR_pselect6		__NR_pselect6_time64
> > +/* Fix sysdeps/unix/sysv/linux/recvmmsg.c.  */
> > +#define __NR_recvmmsg		__NR_recvmmsg_time64
> > +/* Fix sysdeps/unix/sysv/linux/sigtimedwait.c.  */
> > +#define __NR_rt_sigtimedwait	__NR_rt_sigtimedwait_time64
> > +/* Fix sysdeps/unix/sysv/linux/semtimedop.c.  */
> > +#define __NR_semtimedop		__NR_semtimedop_time64
> > +/* Hack sysdeps/unix/sysv/linux/generic/utimes.c.  */
> > +#define __NR_utimensat		__NR_utimensat_time64
> > +
> > +#undef SYS_ify
> > +#define SYS_ify(syscall_name)   (__NR_##syscall_name)
> > +
> > +/* Linux uses a negative return value to indicate syscall errors,
> > +   unlike most Unices, which use the condition codes' carry flag.
> > +
> > +   Since version 2.1 the return value of a system call might be
> > +   negative even if the call succeeded.  E.g., the lseek system call
> > +   might return a large offset.  Therefore we must not anymore test
> > +   for < 0, but test for a real error by making sure the value in R0
> > +   is a real error number.  Linus said he will make sure the no syscall
> > +   returns a value in -1 .. -4095 as a valid result so we can safely
> > +   test with -4095.  */
> > +
> > +#ifdef __ASSEMBLER__
> > +
> > +/* Macros used in syscall-template.S */
> > +#define ret          l.jr r9; l.nop
> > +#define ret_NOERRNO  l.jr r9; l.nop
> > +
> > +#undef	DO_CALL
> > +#define DO_CALL(syscall_name) \
> > +  l.addi r11, r0, SYS_ify (syscall_name); \
> > +  l.sys 1; \
> > +   l.nop
> > +
> > +#undef	PSEUDO
> > +#define PSEUDO(name, syscall_name, args) \
> > +  ENTRY (name); \
> > +  DO_CALL(syscall_name); \
> > +  /* if -4096 < ret < 0 holds, it's an error */ \
> > +  l.sfgeui r11, 0xf001; \
> > +  l.bf L(pseudo_end); \
> > +   l.nop
> > +
> > +#undef	PSEUDO_NOERRNO
> > +#define PSEUDO_NOERRNO(name, syscall_name, args)  \
> > +  ENTRY (name);           \
> > +  DO_CALL(syscall_name)
> > +
> > +#undef	PSEUDO_END
> > +#define PSEUDO_END(name) \
> > +L(pseudo_end): \
> > +  l.j SYSCALL_ERROR_NAME; \
> > +  l.ori r3,r11,0; \
> > +  END (name)
> > +
> > +#undef	PSEUDO_END_NOERRNO
> > +#define PSEUDO_END_NOERRNO(name) \
> > +  END (name)
> > +
> > +#ifndef PIC
> > +/* For static code, on error jump to __syscall_error directly.  */
> > +# define SYSCALL_ERROR_NAME __syscall_error
> > +#elif !IS_IN (libc)
> > +/* Use the internal name for libc shared objects.  */
> > +# define SYSCALL_ERROR_NAME __GI___syscall_error
> > +#else
> > +/* Otherwise, on error do a full PLT jump.  */
> > +# define SYSCALL_ERROR_NAME plt(__syscall_error)
> > +#endif
> > +
> > +#else /* not __ASSEMBLER__ */
> > +
> > +#include <errno.h>
> > +
> > +extern long int __syscall_error (long int neg_errno);
> > +
> > +/* Pointer mangling is not yet supported for or1k.  */
> > +#define PTR_MANGLE(var) (void) (var)
> > +#define PTR_DEMANGLE(var) (void) (var)
> > +
> > +#undef INTERNAL_SYSCALL
> > +#define INTERNAL_SYSCALL(name, nr, args...) \
> > +	INTERNAL_SYSCALL_NCS (SYS_ify (name), nr, args)
> > +
> > +/* The _NCS variant allows non-constant syscall numbers.  */
> > +#undef INTERNAL_SYSCALL_NCS
> > +#define INTERNAL_SYSCALL_NCS(number, nr, args...) \
> > +        ({ unsigned long int __sys_result;                                     \
> > +          {                                                                    \
> > +            long int _sc_ret = (long int) number;                              \
> > +            LOAD_ARGS_##nr (args)                                              \
> > +            register long int __sc_ret __asm__ ("r11") = _sc_ret;              \
> > +            __asm__ __volatile__ ("l.sys 1\n\t"                                \
> > +				  " l.nop\n\t"                                 \
> > +                                  : "+r" (__sc_ret)                            \
> > +                                  : ASM_ARGS_##nr                              \
> > +                                  : ASM_CLOBBERS_##nr                          \
> > +                                    "r12", "r13", "r15", "r17", "r19",         \
> > +                                    "r21", "r23", "r25", "r27", "r29",         \
> > +                                    "r31", "memory");                          \
> > +            __sys_result = __sc_ret;                                           \
> > +          }                                                                    \
> > +          (long int) __sys_result; })
> > +
> > +/* From here on we have nested macros that generate code for
> > +   setting up syscall arguments.  */
> > +
> > +#define LOAD_ARGS_0()
> > +
> > +#define ASM_ARGS_0
> > +#define ASM_CLOBBERS_0  "r3", ASM_CLOBBERS_1
> > +
> > +#define LOAD_ARGS_1(a) \
> > +  long int _a = (long int)(a);                             \
> > +  register long int __a __asm__ ("r3") = _a;
> > +#define ASM_ARGS_1 "r" (__a)
> > +#define ASM_CLOBBERS_1  "r4", ASM_CLOBBERS_2
> > +
> > +#define LOAD_ARGS_2(a, b) \
> > +  long int _b = (long int)(b);                             \
> > +  LOAD_ARGS_1 (a)                                          \
> > +  register long int __b __asm__ ("r4") = _b;
> > +#define ASM_ARGS_2 ASM_ARGS_1, "r" (__b)
> > +#define ASM_CLOBBERS_2  "r5", ASM_CLOBBERS_3
> > +
> > +#define LOAD_ARGS_3(a, b, c) \
> > +  long int _c = (long int)(c);                             \
> > +  LOAD_ARGS_2 (a, b)                                       \
> > +  register long int __c __asm__ ("r5") = _c;
> > +#define ASM_ARGS_3 ASM_ARGS_2, "r" (__c)
> > +#define ASM_CLOBBERS_3  "r6", ASM_CLOBBERS_4
> > +
> > +#define LOAD_ARGS_4(a, b, c, d) \
> > +    LOAD_ARGS_3 (a, b, c)                                  \
> > +  long int _d = (long int)(d);                             \
> > +  register long int __d __asm__ ("r6") = _d;
> > +#define ASM_ARGS_4 ASM_ARGS_3, "r" (__d)
> > +#define ASM_CLOBBERS_4  "r7", ASM_CLOBBERS_5
> > +
> > +#define LOAD_ARGS_5(a, b, c, d, e) \
> > +  long int _e = (long int)(e);                             \
> > +  LOAD_ARGS_4 (a, b, c, d)                                 \
> > +  register long int __e __asm__ ("r7") = _e;
> > +#define ASM_ARGS_5 ASM_ARGS_4, "r" (__e)
> > +#define ASM_CLOBBERS_5  "r8", ASM_CLOBBERS_6
> > +
> > +#define LOAD_ARGS_6(a, b, c, d, e, f) \
> > +  long int _f = (long int)(f);                             \
> > +  LOAD_ARGS_5 (a, b, c, d, e)                              \
> > +  register long int __f __asm__ ("r8") = _f;
> > +#define ASM_ARGS_6 ASM_ARGS_5, "r" (__f)
> > +#define ASM_CLOBBERS_6
> > +
> > +#endif /* not __ASSEMBLER__ */
> > +
> > +#endif /* linux/or1k/sysdep.h */