* amd64obsd-tdep.c (amd64obsd_sigtramp_p): Detect new signal
trampoline to be introduced in OpenBSD 5.0.
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@ -1,3 +1,8 @@
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2011-12-17 Mark Kettenis <kettenis@gnu.org>
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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.
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2011-12-17 Jan Kratochvil <jan.kratochvil@redhat.com>
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Fix build regression from the PR threads/10729 fix.
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@ -88,12 +88,18 @@ amd64obsd_sigtramp_p (struct frame_info *this_frame)
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
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const gdb_byte sigreturn[] =
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const gdb_byte osigreturn[] =
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{
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0x48, 0xc7, 0xc0,
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0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
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0xcd, 0x80 /* int $0x80 */
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};
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const gdb_byte sigreturn[] =
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{
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0x48, 0xc7, 0xc0,
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0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */
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0x0f, 0x05 /* syscall */
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};
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size_t buflen = (sizeof sigreturn) + 1;
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gdb_byte *buf;
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char *name;
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@ -116,9 +122,12 @@ amd64obsd_sigtramp_p (struct frame_info *this_frame)
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/* Check for sigreturn(2). Depending on how the assembler encoded
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the `movq %rsp, %rdi' instruction, the code starts at offset 6 or
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7. */
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7. OpenBSD 5.0 and later use the `syscall' instruction. Older
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versions use `int $0x80'. Check for both. */
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if (memcmp (buf, sigreturn, sizeof sigreturn)
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&& memcpy (buf + 1, sigreturn, sizeof sigreturn))
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&& memcmp (buf + 1, sigreturn, sizeof sigreturn)
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&& memcmp (buf, osigreturn, sizeof osigreturn)
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&& memcmp (buf + 1, osigreturn, sizeof osigreturn))
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return 0;
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return 1;
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