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From: Jiangshuai Li <jiangshuaili@sourceware.org> To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdb/csky add unwinder for sigtramp frame when kernel 4.x and later Date: Mon, 15 Aug 2022 02:42:36 +0000 (GMT) [thread overview] Message-ID: <20220815024236.1298D3858D32@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=105afa7f230e5fed8f5a2eb28bc14d7696f5ac72 commit 105afa7f230e5fed8f5a2eb28bc14d7696f5ac72 Author: Jiangshuai Li <jiangshuai_li@linux.alibaba.com> Date: Mon Aug 15 10:40:29 2022 +0800 gdb/csky add unwinder for sigtramp frame when kernel 4.x and later When kernel veriosn >= V4.x, the characteristic values used to determine whether it is a signal function call are: movi r7, 139 trap 0 Registers are saved at (sp + CSKY_SIGINFO_OFFSET + CSKY_SIGINFO_SIZE + CSKY_UCONTEXT_SIGCONTEXT + CSKY_SIGCONTEXT_PT_REGS_TLS). The order is described in csky_linux_rt_sigreturn_init_pt_regs. Diff: --- gdb/csky-linux-tdep.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ gdb/csky-tdep.h | 6 ++++++ 2 files changed, 53 insertions(+) diff --git a/gdb/csky-linux-tdep.c b/gdb/csky-linux-tdep.c index ae5d2bba33c..7bcc1712180 100644 --- a/gdb/csky-linux-tdep.c +++ b/gdb/csky-linux-tdep.c @@ -353,6 +353,51 @@ csky_linux_rt_sigreturn_tramp_frame = { csky_linux_rt_sigreturn_init }; +static void +csky_linux_rt_sigreturn_init_pt_regs (const struct tramp_frame *self, + struct frame_info *this_frame, + struct trad_frame_cache *this_cache, + CORE_ADDR func) +{ + int i; + CORE_ADDR sp = get_frame_register_unsigned (this_frame, CSKY_SP_REGNUM); + + CORE_ADDR base = sp + CSKY_SIGINFO_OFFSET + CSKY_SIGINFO_SIZE + + CSKY_UCONTEXT_SIGCONTEXT + + CSKY_SIGCONTEXT_PT_REGS_TLS; + + /* LR */ + trad_frame_set_reg_addr (this_cache, CSKY_R15_REGNUM, base); + + /* PC */ + trad_frame_set_reg_addr (this_cache, CSKY_PC_REGNUM, base + 4); + + /* PSR */ + trad_frame_set_reg_addr (this_cache, CSKY_CR0_REGNUM, base + 8); + + /* SP */ + trad_frame_set_reg_addr (this_cache, CSKY_SP_REGNUM, base + 12); + + /* Set addrs of R0 ~ R13. */ + for (i = 0; i < 14; i++) + trad_frame_set_reg_addr (this_cache, i, base + i * 4 + 20); + + trad_frame_set_id (this_cache, frame_id_build (sp, func)); +} + + +static struct tramp_frame +csky_linux_rt_sigreturn_tramp_frame_kernel_4x = { + SIGTRAMP_FRAME, + 4, + { + { CSKY_MOVI_R7_139, ULONGEST_MAX }, + { CSKY_TRAP_0, ULONGEST_MAX }, + { TRAMP_SENTINEL_INSN } + }, + csky_linux_rt_sigreturn_init_pt_regs +}; + /* Hook function for gdbarch_register_osabi. */ static void @@ -378,6 +423,8 @@ csky_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) tramp_frame_prepend_unwinder (gdbarch, &csky_linux_rt_sigreturn_tramp_frame); + tramp_frame_prepend_unwinder (gdbarch, + &csky_linux_rt_sigreturn_tramp_frame_kernel_4x); } void _initialize_csky_linux_tdep (); diff --git a/gdb/csky-tdep.h b/gdb/csky-tdep.h index 3ee50fc5931..f845b9ab744 100644 --- a/gdb/csky-tdep.h +++ b/gdb/csky-tdep.h @@ -379,4 +379,10 @@ enum csky_regnum #define CSKY_MOVI_R7_173 0x00adea07 #define CSKY_TRAP_0 0x2020c000 +/* Sizeof (tls) */ +#define CSKY_SIGCONTEXT_PT_REGS_TLS 4 + +/* Macro for kernel 4.x */ +#define CSKY_MOVI_R7_139 0x008bea07 + #endif
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