#include "target.h"
#include "trad-frame.h"
#include "frame-base.h"
+#include "gdb_assert.h"
struct frame_data
{
}
static CORE_ADDR
-tramp_frame_start (CORE_ADDR pc, const struct tramp_frame *tramp)
+tramp_frame_start (const struct tramp_frame *tramp,
+ struct frame_info *next_frame, CORE_ADDR pc)
{
int ti;
/* Search through the trampoline for one that matches the
instruction sequence around PC. */
- for (ti = 0; tramp->insn[ti] != 0; ti++)
+ for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
{
CORE_ADDR func = pc - tramp->insn_size * ti;
int i;
for (i = 0; 1; i++)
{
- bfd_byte buf[sizeof (LONGEST)];
- CORE_ADDR insn;
- if (tramp->insn[i] == 0)
+ bfd_byte buf[sizeof (tramp->insn[0])];
+ ULONGEST insn;
+ if (tramp->insn[i].bytes == TRAMP_SENTINEL_INSN)
return func;
- if (target_read_memory (func + i * tramp->insn_size, buf,
- tramp->insn_size) != 0)
+ if (!safe_frame_unwind_memory (next_frame,
+ func + i * tramp->insn_size,
+ buf, tramp->insn_size))
break;
insn = extract_unsigned_integer (buf, tramp->insn_size);
- if (tramp->insn[i] != insn)
+ if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
break;
}
}
const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
CORE_ADDR pc = frame_pc_unwind (next_frame);
CORE_ADDR func;
- char *name;
struct tramp_frame_cache *tramp_cache;
- /* 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;
- /* Finally, check that the trampoline matches at PC. */
- func = tramp_frame_start (pc, tramp);
+ /* tausq/2004-12-12: We used to assume if pc has a name or is in a valid
+ section, then this is not a trampoline. However, this assumption is
+ false on HPUX which has a signal trampoline that has a name; it can
+ also be false when using an alternative signal stack. */
+ func = tramp_frame_start (tramp, next_frame, pc);
if (func == 0)
return 0;
tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
}
void
-tramp_frame_append (struct gdbarch *gdbarch,
- const struct tramp_frame *tramp_frame)
+tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
+ const struct tramp_frame *tramp_frame)
{
struct frame_data *data;
struct frame_unwind *unwinder;
+ int i;
+
+ /* Check that the instruction sequence contains a sentinel. */
+ for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
+ {
+ if (tramp_frame->insn[i].bytes == TRAMP_SENTINEL_INSN)
+ break;
+ }
+ gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
+ gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0].bytes));
data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
data->tramp_frame = tramp_frame;
- unwinder->type = SIGTRAMP_FRAME;
+ unwinder->type = tramp_frame->frame_type;
unwinder->unwind_data = data;
unwinder->sniffer = tramp_frame_sniffer;
unwinder->this_id = tramp_frame_this_id;
unwinder->prev_register = tramp_frame_prev_register;
- frame_unwind_register_unwinder (gdbarch, unwinder);
+ frame_unwind_prepend_unwinder (gdbarch, unwinder);
}