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authorMark Kettenis <kettenis@gnu.org>2004-07-30 22:45:52 +0000
committerMark Kettenis <kettenis@gnu.org>2004-07-30 22:45:52 +0000
commitdc8566929cf7298314e47fbda9e8a6592b73c18a (patch)
tree1b633e3247b5f672ca4d9d094d3ad73488a9e01f /gdb/sparc64obsd-tdep.c
parentc724d49b86de26d6da23248cb28dc754d06ee425 (diff)
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* sparc64obsd-tdep.c (sparc64obsd_sigreturn_offset): New variable.
(sparc64obsd_pc_in_sigtramp): Reorganize to avoid goto.
Diffstat (limited to 'gdb/sparc64obsd-tdep.c')
-rw-r--r--gdb/sparc64obsd-tdep.c41
1 files changed, 19 insertions, 22 deletions
diff --git a/gdb/sparc64obsd-tdep.c b/gdb/sparc64obsd-tdep.c
index 8ad88b5..bb6626d 100644
--- a/gdb/sparc64obsd-tdep.c
+++ b/gdb/sparc64obsd-tdep.c
@@ -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;
- }
-
- return 0;
- }
+ /* Check for "restore %g0, SYS_sigreturn, %g1". */
+ insn = sparc_fetch_instruction (start_pc + *offset);
+ if (insn != 0x83e82067)
+ continue;
- /* Check for "t ST_SYSCALL". */
- insn = sparc_fetch_instruction (start_pc + offset + 0xf4);
- if (insn != 0x91d02000)
- return 0;
+ /* Check for "t ST_SYSCALL". */
+ insn = sparc_fetch_instruction (start_pc + *offset + 8);
+ if (insn != 0x91d02000)
+ continue;
+
+ return 1;
+ }
- return 1;
+ return 0;
}
static struct sparc_frame_cache *