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Add support for RT signal frame detection on ARM.

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This patch adds a few more patterns to the check that detects if the IP
points to a sigreturn sequence.

Signed-off-by: Ken Werner <ken.werner@linaro.org>
This commit is contained in:
Ken Werner 2011-04-28 17:14:30 +02:00
parent 1e10c2931d
commit 9533ea1a6a
1 changed files with 23 additions and 7 deletions
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30
src/arm/Gis_signal_frame.c
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@ -29,11 +29,21 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#ifdef __linux__
#include <sys/syscall.h>
/* ARM EABI sigreturn (the syscall number is loaded into r7) */
#define MOV_R7_SIGRETURN (0xe3a07000UL | __NR_sigreturn)
#define MOV_R7_RT_SIGRETURN (0xe3a07000UL | __NR_rt_sigreturn)
/* ARM OABI sigreturn (using SWI) */
#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))
#define ARM_RT_SIGRETURN (0xef000000UL |(__NR_rt_sigreturn)|(__NR_OABI_SYSCALL_BASE))
/* Thumb sigreturn (two insns, syscall number is loaded into r7) */
#define THUMB_SIGRETURN (0xdf00UL << 16 | 0x2700 | __NR_sigreturn)
#define THUMB_RT_SIGRETURN (0xdf00UL << 16 | 0x2700 | __NR_rt_sigreturn)
#endif
/* Returns 1 in case of a non-RT signal frame and 2 in case of a RT signal
frame. */
PROTECTED int
unw_is_signal_frame (unw_cursor_t *cursor)
{
@ -50,13 +60,19 @@ unw_is_signal_frame (unw_cursor_t *cursor)
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;
/* Return 1 if the IP points to a non-RT sigreturn sequence. */
if (w0 == MOV_R7_SIGRETURN || w0 == ARM_SIGRETURN || w0 == THUMB_SIGRETURN)
return 1;
/* Return 2 if the IP points to a RT sigreturn sequence. */
else if (w0 == MOV_R7_RT_SIGRETURN || w0 == ARM_RT_SIGRETURN
|| w0 == THUMB_RT_SIGRETURN)
return 2;
return 0;
#else
printf ("%s: implement me\n", __FUNCTION__);
return -UNW_ENOINFO;