mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-06-26 03:11:44 +02:00
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* libunwind - a platform-independent unwind library
|
|
Copyright (C) 2002-2003 Hewlett-Packard Co
|
|
Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
|
|
|
|
This file is part of libunwind.
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining
|
|
a copy of this software and associated documentation files (the
|
|
"Software"), to deal in the Software without restriction, including
|
|
without limitation the rights to use, copy, modify, merge, publish,
|
|
distribute, sublicense, and/or sell copies of the Software, and to
|
|
permit persons to whom the Software is furnished to do so, subject to
|
|
the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be
|
|
included in all copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
|
|
#include "unwind_i.h"
|
|
|
|
PROTECTED int
|
|
unw_is_signal_frame (unw_cursor_t *cursor)
|
|
{
|
|
#ifdef __linux__
|
|
struct cursor *c = (struct cursor *) cursor;
|
|
unw_word_t w0, w1, 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 EIP points at sigreturn() sequence. On Linux, this is:
|
|
|
|
__restore:
|
|
0x58 pop %eax
|
|
0xb8 0x77 0x00 0x00 0x00 movl 0x77,%eax
|
|
0xcd 0x80 int 0x80
|
|
|
|
without SA_SIGINFO, and
|
|
|
|
__restore_rt:
|
|
0xb8 0xad 0x00 0x00 0x00 movl 0x80,%eax
|
|
0xcd 0x80 int 0x80
|
|
0x90 nop
|
|
|
|
if SA_SIGINFO is specified.
|
|
*/
|
|
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)
|
|
return ret;
|
|
ret = ((w0 == 0x0077b858 && w1 == 0x80cd0000)
|
|
|| (w0 == 0x0000adb8 && w1 == 0x9080cd00));
|
|
Debug (16, "returning %d\n", ret);
|
|
return ret;
|
|
#else
|
|
printf ("%s: implement me\n", __FUNCTION__);
|
|
#endif
|
|
return -UNW_ENOINFO;
|
|
}
|