diff options
Diffstat (limited to 'gdb/x86-64-linux-tdep.c')
| -rw-r--r-- | gdb/x86-64-linux-tdep.c | 76 |
1 files changed, 65 insertions, 11 deletions
diff --git a/gdb/x86-64-linux-tdep.c b/gdb/x86-64-linux-tdep.c index ac41daa8849..b8385a6c756 100644 --- a/gdb/x86-64-linux-tdep.c +++ b/gdb/x86-64-linux-tdep.c @@ -35,8 +35,10 @@ #define LINUX_SIGTRAMP_OFFSET1 (7) static const unsigned char linux_sigtramp_code[] = { - LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x89, 0x00, 0x00, 0x00, /* mov $0x89,%rax */ - LINUX_SIGTRAMP_INSN1, 0x05 /* syscall */ + /* mov $__NR_rt_sigreturn,%rax */ + LINUX_SIGTRAMP_INSN0, 0xc7, 0xc0, 0x0f, 0x00, 0x00, 0x00, + /* syscall */ + LINUX_SIGTRAMP_INSN1, 0x05 }; #define LINUX_SIGTRAMP_LEN (sizeof linux_sigtramp_code) @@ -68,17 +70,22 @@ x86_64_linux_sigtramp_start (CORE_ADDR pc) return pc; } -#define LINUX_SIGINFO_SIZE 128 +#define LINUX_SIGINFO_SIZE 0 /* Offset to struct sigcontext in ucontext, from <asm/ucontext.h>. */ -#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET (36) +#define LINUX_UCONTEXT_SIGCONTEXT_OFFSET 40 + +/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ +#define LINUX_SIGCONTEXT_PC_OFFSET 128 +#define LINUX_SIGCONTEXT_FP_OFFSET 120 /* Assuming FRAME is for a GNU/Linux sigtramp routine, return the address of the associated sigcontext structure. */ -CORE_ADDR +static CORE_ADDR x86_64_linux_sigcontext_addr (struct frame_info *frame) { CORE_ADDR pc; + ULONGEST rsp; pc = x86_64_linux_sigtramp_start (frame->pc); if (pc) @@ -92,8 +99,8 @@ x86_64_linux_sigcontext_addr (struct frame_info *frame) /* This is the top frame. */ - return read_register (SP_REGNUM) + LINUX_SIGINFO_SIZE + - LINUX_UCONTEXT_SIGCONTEXT_OFFSET; + rsp = read_register (SP_REGNUM); + return rsp + LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; } @@ -101,13 +108,10 @@ x86_64_linux_sigcontext_addr (struct frame_info *frame) return 0; } -/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */ -#define LINUX_SIGCONTEXT_PC_OFFSET (136) - /* Assuming FRAME is for a GNU/Linux sigtramp routine, return the saved program counter. */ -CORE_ADDR +static CORE_ADDR x86_64_linux_sigtramp_saved_pc (struct frame_info *frame) { CORE_ADDR addr; @@ -135,3 +139,53 @@ x86_64_linux_frame_saved_pc (struct frame_info *frame) return x86_64_linux_sigtramp_saved_pc (frame); return cfi_get_ra (frame); } + +/* Return whether PC is in a GNU/Linux sigtramp routine. */ + +int +x86_64_linux_in_sigtramp (CORE_ADDR pc, char *name) +{ + if (name) + return STREQ ("__restore_rt", name); + + return (x86_64_linux_sigtramp_start (pc) != 0); +} + +CORE_ADDR +x86_64_linux_frame_chain (struct frame_info *fi) +{ + ULONGEST addr; + CORE_ADDR fp, pc; + + if (!fi->signal_handler_caller) + { + fp = cfi_frame_chain (fi); + if (fp) + return fp; + else + addr = fi->frame; + } + else + addr = fi->next->frame; + + addr += LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; + + fp = read_memory_integer (addr + LINUX_SIGCONTEXT_FP_OFFSET, 8) + 8; + + return fp; +} + +void +x86_64_init_frame_pc (int fromleaf, struct frame_info *fi) +{ + CORE_ADDR addr; + + if (fi->next && fi->next->signal_handler_caller) + { + addr = fi->next->next->frame + + LINUX_SIGINFO_SIZE + LINUX_UCONTEXT_SIGCONTEXT_OFFSET; + fi->pc = read_memory_integer (addr + LINUX_SIGCONTEXT_PC_OFFSET, 8); + } + else + cfi_init_frame_pc (fromleaf, fi); +} |