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* amd64obsd-tdep.c (amd64obsd_sigtramp_p): Detect new signal

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trampoline to be introduced in OpenBSD 5.0.
This commit is contained in:
Mark Kettenis
2011-12-17 12:22:06 +00:00
parent 3e290cb1d1
commit 0dcddd8422
2 changed files with 17 additions and 3 deletions
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15
gdb/amd64obsd-tdep.c
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@@ -88,12 +88,18 @@ amd64obsd_sigtramp_p (struct frame_info *this_frame)
{
CORE_ADDR pc = get_frame_pc (this_frame);
CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
const gdb_byte sigreturn[] =
const gdb_byte osigreturn[] =
{
0x48, 0xc7, 0xc0,
0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
0xcd, 0x80 /* int $0x80 */
};
const gdb_byte sigreturn[] =
{
0x48, 0xc7, 0xc0,
0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
0x0f, 0x05 /* syscall */
};
size_t buflen = (sizeof sigreturn) + 1;
gdb_byte *buf;
char *name;
@@ -116,9 +122,12 @@ amd64obsd_sigtramp_p (struct frame_info *this_frame)
/* Check for sigreturn(2). Depending on how the assembler encoded
the `movq %rsp, %rdi' instruction, the code starts at offset 6 or
7. */
7. OpenBSD 5.0 and later use the `syscall' instruction. Older
versions use `int $0x80'. Check for both. */
if (memcmp (buf, sigreturn, sizeof sigreturn)
&& memcpy (buf + 1, sigreturn, sizeof sigreturn))
&& memcmp (buf + 1, sigreturn, sizeof sigreturn)
&& memcmp (buf, osigreturn, sizeof osigreturn)
&& memcmp (buf + 1, osigreturn, sizeof osigreturn))
return 0;
return 1;