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 *
struct sparc_frame_cache *cache =
sparc64obsd_frame_cache (next_frame, this_cache);
- trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind sparc64obsd_frame_unwind =