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* sparc64obsd-tdep.c (sparc64obsd_sigreturn_offset): New variable.

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(sparc64obsd_pc_in_sigtramp): Reorganize to avoid goto.
This commit is contained in:
Mark Kettenis 2004-07-30 22:45:52 +00:00
parent c724d49b86
commit dc8566929c
2 changed files with 23 additions and 21 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2004-07-31 Mark Kettenis <kettenis@gnu.org>
* sparc64obsd-tdep.c (sparc64obsd_sigreturn_offset): New variable.
(sparc64obsd_pc_in_sigtramp): Reorganize to avoid goto.
2004-07-30 Andrew Cagney <cagney@gnu.org>
* GDB 6.2 released from gdb_6_2-branch.

39
gdb/sparc64obsd-tdep.c
View file

@ -74,43 +74,40 @@ sparc64obsd_supply_gregset (const struct regset *regset,
The signal trampoline will be mapped at an address that is page
aligned. We recognize the signal trampoline by the looking for the
sigreturn system call. */
sigreturn system call. The offset where we can find the code that
makes this system call varies from release to release. For OpenBSD
3.6 and later releases we can find the code at offset 0xec. For
OpenBSD 3.5 and earlier releases, we find it at offset 0xe8. */
static const int sparc64obsd_page_size = 8192;
static const int sparc64obsd_sigreturn_offset[] = { 0xec, 0xe8, -1 };
static int
sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
unsigned long insn;
int offset = 0;
const int *offset;
if (name)
return 0;
retry:
/* Check for "restore %g0, SYS_sigreturn, %g1". */
insn = sparc_fetch_instruction (start_pc + offset + 0xec);
if (insn != 0x83e82067)
for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
{
if (offset == 0)
{
/* In OpenBSD 3.5 and earlier releases, the code
implementing the sigreturn system call was at a different
offset within the signal trampoline. Try again. */
offset = -4;
goto retry;
}
/* Check for "restore %g0, SYS_sigreturn, %g1". */
insn = sparc_fetch_instruction (start_pc + *offset);
if (insn != 0x83e82067)
continue;
return 0;
}
/* Check for "t ST_SYSCALL". */
insn = sparc_fetch_instruction (start_pc + *offset + 8);
if (insn != 0x91d02000)
continue;
/* Check for "t ST_SYSCALL". */
insn = sparc_fetch_instruction (start_pc + offset + 0xf4);
if (insn != 0x91d02000)
return 0;
return 1;
}
return 1;
return 0;
}
static struct sparc_frame_cache *