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Signal trampoline on amd64 for ia32 is special.

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This commit is contained in:
Konstantin Belousov 2010-03-13 21:26:50 +02:00
parent e51429280b
commit 8a75ba971a
1 changed files with 23 additions and 10 deletions
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33
src/x86/Gis_signal_frame.c
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@ -80,7 +80,14 @@ unw_is_signal_frame (unw_cursor_t *cursor)
arg = c->dwarf.as_arg;
/* Check if EIP points at sigreturn() sequence. It can be:
sigcode+4:
sigcode+4: from amd64 freebsd32 environment
8d 44 24 20 lea 0x20(%esp),%eax
50 push %eax
b8 a1 01 00 00 mov $0x1a1,%ea
50 push %eax
cd 80 int $0x80
sigcode+4: from real i386
8d 44 24 20 lea 0x20(%esp),%eax
50 push %eax
f7 40 54 00 02 00 testl $0x20000,0x54(%eax)
@ -96,17 +103,23 @@ osigcode:
XXX
*/
ip = c->dwarf.ip;
if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0 ||
(ret = (*a->access_mem) (as, ip + 4, &w1, 0, arg)) < 0 ||
(ret = (*a->access_mem) (as, ip + 8, &w2, 0, arg)) < 0 ||
(ret = (*a->access_mem) (as, ip + 16, &w3, 0, arg)) < 0 ||
(ret = (*a->access_mem) (as, ip + 20, &w4, 0, arg)) < 0 ||
(ret = (*a->access_mem) (as, ip + 24, &w5, 0, arg)) < 0)
return ret;
ret = X86_SCF_NONE;
if (w0 == 0x2024448d && w1 == 0x5440f750 && w2 == 0x75000200 &&
w3 == 0x14688e03 && w4 == 0x0001a1b8 && w5 == 0x80cd5000)
if ((*a->access_mem) (as, ip, &w0, 0, arg) < 0 ||
(*a->access_mem) (as, ip + 4, &w1, 0, arg) < 0 ||
(*a->access_mem) (as, ip + 8, &w2, 0, arg) < 0 ||
(*a->access_mem) (as, ip + 12, &w3, 0, arg) < 0)
return ret;
if (w0 == 0x2024448d && w1 == 0x01a1b850 && w2 == 0xcd500000 &&
(w3 & 0xff) == 0x80)
ret = X86_SCF_FREEBSD_SIGFRAME;
else {
if ((*a->access_mem) (as, ip + 16, &w4, 0, arg) < 0 ||
(*a->access_mem) (as, ip + 20, &w5, 0, arg) < 0)
return ret;
if (w0 == 0x2024448d && w1 == 0x5440f750 && w2 == 0x75000200 &&
w3 == 0x14688e03 && w4 == 0x0001a1b8 && w5 == 0x80cd5000)
ret = X86_SCF_FREEBSD_SIGFRAME;
}
Debug (16, "returning %d\n", ret);
return (ret);
#else