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Add ARM signal frame detection

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Implements a check for call to sigreturn that the kernel will have
setup before jumping to the signal handler.

Signed-off-by: Ken Werner <ken.werner@linaro.org>
This commit is contained in:
Zachary T Welch 2011-03-15 18:15:41 +00:00 committed by Arun Sharma
parent 6a072982dd
commit 049e2ba1b9
1 changed files with 30 additions and 1 deletions
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31
src/arm/Gis_signal_frame.c
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@ -1,5 +1,6 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2008 CodeSourcery
Copyright 2011 Linaro Limited
This file is part of libunwind.
@ -25,11 +26,39 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <stdio.h>
#include "unwind_i.h"
/* FIXME for ARM. */
#ifdef __linux__
#include <sys/syscall.h>
#define ARM_SIGRETURN (0xef000000UL |(__NR_sigreturn)|(__NR_OABI_SYSCALL_BASE))
#define THUMB_SIGRETURN (0xdf00UL << 16 | 0x2700 | (__NR_sigreturn - __NR_SYSCALL_BASE))
#define MOV_R7_SIGRETURN (0xe3a07000UL | (__NR_sigreturn - __NR_SYSCALL_BASE))
#endif
PROTECTED int
unw_is_signal_frame (unw_cursor_t *cursor)
{
#ifdef __linux__
struct cursor *c = (struct cursor *) cursor;
unw_word_t w0, 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;
ip = c->dwarf.ip;
if ((ret = (*a->access_mem) (as, ip, &w0, 0, arg)) < 0)
return ret;
ret = (w0 == ARM_SIGRETURN) || (w0 == MOV_R7_SIGRETURN)
|| (w0 == THUMB_SIGRETURN);
fprintf (stderr, "w0=%8.8x ret=%d\n", w0, ret);
Debug (16, "returning %d\n", ret);
return ret;
#else
printf ("%s: implement me\n", __FUNCTION__);
return -UNW_ENOINFO;
#endif
}