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/* Signal trampoline unwinder, for GDB the GNU Debugger.
Copyright 2004 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "tramp-frame.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "symtab.h"
#include "objfiles.h"
#include "target.h"
#include "trad-frame.h"
#include "frame-base.h"
struct frame_data
{
const struct tramp_frame *tramp_frame;
};
struct tramp_frame_cache
{
CORE_ADDR func;
const struct tramp_frame *tramp_frame;
struct trad_frame_cache *trad_cache;
};
static struct trad_frame_cache *
tramp_frame_cache (struct frame_info *next_frame,
void **this_cache)
{
CORE_ADDR pc = frame_pc_unwind (next_frame);
struct tramp_frame_cache *tramp_cache = (*this_cache);
if (tramp_cache->trad_cache == NULL)
{
tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
next_frame,
tramp_cache->trad_cache,
tramp_cache->func);
}
return tramp_cache->trad_cache;
}
static void
tramp_frame_this_id (struct frame_info *next_frame,
void **this_cache,
struct frame_id *this_id)
{
struct trad_frame_cache *trad_cache
= tramp_frame_cache (next_frame, this_cache);
(*this_id) = trad_cache->this_id;
}
static void
tramp_frame_prev_register (struct frame_info *next_frame,
void **this_cache,
int prev_regnum,
int *optimizedp,
enum lval_type * lvalp,
CORE_ADDR *addrp,
int *realnump, void *valuep)
{
struct trad_frame_cache *trad_cache
= tramp_frame_cache (next_frame, this_cache);
trad_frame_prev_register (next_frame, trad_cache->prev_regs, prev_regnum,
optimizedp, lvalp, addrp, realnump, valuep);
}
static CORE_ADDR
tramp_frame_start (CORE_ADDR pc, const struct tramp_frame *tramp)
{
int ti;
/* Search through the trampoline for one that matches the
instruction sequence around PC. */
for (ti = 0; tramp->insn[ti] != 0; 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)
return func;
if (target_read_memory (func + i * tramp->insn_size, buf,
tramp->insn_size) != 0)
break;
insn = extract_unsigned_integer (buf, tramp->insn_size);
if (tramp->insn[i] != insn)
break;
}
}
/* Trampoline doesn't match. */
return 0;
}
static int
tramp_frame_sniffer (const struct frame_unwind *self,
struct frame_info *next_frame,
void **this_cache)
{
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);
if (func == 0)
return 0;
tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
tramp_cache->func = func;
tramp_cache->tramp_frame = tramp;
(*this_cache) = tramp_cache;
return 1;
}
void
tramp_frame_append (struct gdbarch *gdbarch,
const struct tramp_frame *tramp_frame)
{
struct frame_data *data;
struct frame_unwind *unwinder;
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->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);
}
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