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Add implementation of unw_is_signal_frame for freebsd.

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This commit is contained in:
Konstantin Belousov 2010-03-06 18:08:44 +02:00
parent 1ba7599250
commit 81f2de0083
1 changed files with 29 additions and 2 deletions
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31
src/x86_64/Gis_signal_frame.c
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@ -72,8 +72,35 @@ PROTECTED int
unw_is_signal_frame (unw_cursor_t *cursor)
{
/* XXXKIB */
printf ("%s: implement me\n", __FUNCTION__);
return -UNW_ENOINFO;
struct cursor *c = (struct cursor *) cursor;
unw_word_t w0, w1, w2, w3, w4, ip;
unw_addr_space_t as;
unw_accessors_t *a;
void *arg;
int ret;
as = c->dwarf.as;
a = unw_get_accessors (as);
arg = c->dwarf.as_arg;
/* Check if RIP points at sigreturn sequence.
48 8d 7c 24 10 lea SIGF_UC(%rsp),%rdi
6a 00 pushq $0
48 c7 c0 a1 01 00 00 movq $SYS_sigreturn,%rax
0f 05 syscall
f4 0: hlt
eb fd jmp 0b
*/
ip = c->dwarf.ip;
if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0
|| (ret = (*a->access_mem) (as, ip + 8, &w1, 0, arg)) < 0
|| (ret = (*a->access_mem) (as, ip + 16, &w2, 0, arg)) < 0)
return 0;
w2 &= 0xffffff;
return (w0 == 0x48006a10247c8d48 &&
w1 == 0x050f000001a1c0c7 &&
w2 == 0x0000000000fdebf4);
}
#else /* __linux__ */