#include "defs.h"
#include "arch-utils.h"
+#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
+#include "symtab.h"
+#include "objfiles.h"
#include "osabi.h"
#include "target.h"
/* Default page size. */
static const int i386obsd_page_size = 4096;
-/* Return whether PC is in an OpenBSD sigtramp routine. */
+/* Return whether the frame preceding NEXT_FRAME corresponds to an
+ OpenBSD sigtramp routine. */
static int
-i386obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
+i386obsd_sigtramp_p (struct frame_info *next_frame)
{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
const char sigreturn[] =
{
0x67, 0x00, 0x00, 0x00, /* movl $SYS_sigreturn, %eax */
0xcd, 0x80 /* int $0x80 */
};
- char *buf;
+ size_t buflen = sizeof sigreturn;
+ char *name, *buf;
- /* Avoid reading memory from the target if possible. If we're in a
- named function, we're certainly not in a sigtramp routine
- provided by the kernel. Take synthetic function names into
- account though. */
- if (name && name[0] != '<')
+ /* If the function has a valid symbol name, it isn't a
+ trampoline. */
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (name != NULL)
return 0;
+ /* If the function lives in a valid section (even without a starting
+ point) it isn't a trampoline. */
+ if (find_pc_section (pc) != NULL)
+ return 0;
+
+ /* Allocate buffer. */
+ buf = alloca (buflen);
+
/* If we can't read the instructions at START_PC, return zero. */
- buf = alloca (sizeof sigreturn);
- if (target_read_memory (start_pc + 0x14, buf, sizeof sigreturn))
+ if (!safe_frame_unwind_memory (next_frame, start_pc + 0x0a, buf, buflen))
return 0;
/* Check for sigreturn(2). */
- if (memcmp (buf, sigreturn, sizeof sigreturn) == 0)
+ if (memcmp (buf, sigreturn, buflen) == 0)
return 1;
- /* Check for a traditional BSD sigtramp routine. */
- return i386bsd_pc_in_sigtramp (pc, name);
-}
-
-/* Return the start address of the sigtramp routine. */
-
-static CORE_ADDR
-i386obsd_sigtramp_start (CORE_ADDR pc)
-{
- CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
-
- if (i386bsd_pc_in_sigtramp (pc, NULL))
- return i386bsd_sigtramp_start (pc);
-
- return start_pc;
-}
-
-/* Return the end address of the sigtramp routine. */
-
-static CORE_ADDR
-i386obsd_sigtramp_end (CORE_ADDR pc)
-{
- CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
+ /* If we can't read the instructions at START_PC, return zero. */
+ if (!safe_frame_unwind_memory (next_frame, start_pc + 0x14, buf, buflen))
+ return 0;
- if (i386bsd_pc_in_sigtramp (pc, NULL))
- return i386bsd_sigtramp_end (pc);
+ /* Check for sigreturn(2) (again). */
+ if (memcmp (buf, sigreturn, buflen) == 0)
+ return 1;
- return start_pc + 0x22;
+ return 0;
}
\f
/* Mapping between the general-purpose registers in `struct reg'
struct regcache *regcache, int regnum,
const void *regs, size_t len)
{
- const struct gdbarch_tdep *tdep = regset->descr;
+ const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
&& sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
{
if (tdep->gregset == NULL)
- {
- tdep->gregset = XMALLOC (struct regset);
- tdep->gregset->descr = tdep;
- tdep->gregset->supply_regset = i386obsd_aout_supply_regset;
- }
+ tdep->gregset =
+ regset_alloc (gdbarch, i386obsd_aout_supply_regset, NULL);
return tdep->gregset;
}
/* OpenBSD uses a different memory layout. */
tdep->sigtramp_start = i386obsd_sigtramp_start_addr;
tdep->sigtramp_end = i386obsd_sigtramp_end_addr;
- set_gdbarch_deprecated_pc_in_sigtramp (gdbarch, i386obsd_pc_in_sigtramp);
- set_gdbarch_deprecated_sigtramp_start (gdbarch, i386obsd_sigtramp_start);
- set_gdbarch_deprecated_sigtramp_end (gdbarch, i386obsd_sigtramp_end);
+ tdep->sigtramp_p = i386obsd_sigtramp_p;
/* OpenBSD has a `struct sigcontext' that's different from the
original 4.3 BSD. */