/* Signal trampoline unwinder, for GDB the GNU Debugger.
- Copyright 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004-2020 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
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "tramp-frame.h"
};
static struct trad_frame_cache *
-tramp_frame_cache (struct frame_info *next_frame,
+tramp_frame_cache (struct frame_info *this_frame,
void **this_cache)
{
- CORE_ADDR pc = frame_pc_unwind (next_frame);
- struct tramp_frame_cache *tramp_cache = (*this_cache);
+ struct tramp_frame_cache *tramp_cache
+ = (struct tramp_frame_cache *) *this_cache;
+
if (tramp_cache->trad_cache == NULL)
{
- tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
+ tramp_cache->trad_cache = trad_frame_cache_zalloc (this_frame);
tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
- next_frame,
+ this_frame,
tramp_cache->trad_cache,
tramp_cache->func);
}
}
static void
-tramp_frame_this_id (struct frame_info *next_frame,
+tramp_frame_this_id (struct frame_info *this_frame,
void **this_cache,
struct frame_id *this_id)
{
struct trad_frame_cache *trad_cache
- = tramp_frame_cache (next_frame, this_cache);
+ = tramp_frame_cache (this_frame, this_cache);
+
trad_frame_get_id (trad_cache, this_id);
}
-static void
-tramp_frame_prev_register (struct frame_info *next_frame,
+static struct value *
+tramp_frame_prev_register (struct frame_info *this_frame,
void **this_cache,
- int prev_regnum,
- int *optimizedp,
- enum lval_type * lvalp,
- CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int prev_regnum)
{
struct trad_frame_cache *trad_cache
- = tramp_frame_cache (next_frame, this_cache);
- trad_frame_get_register (trad_cache, next_frame, prev_regnum, optimizedp,
- lvalp, addrp, realnump, valuep);
+ = tramp_frame_cache (this_frame, this_cache);
+
+ return trad_frame_get_register (trad_cache, this_frame, prev_regnum);
}
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 *this_frame, CORE_ADDR pc)
{
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
int ti;
+
+ /* Check if we can use this trampoline. */
+ if (tramp->validate && !tramp->validate (tramp, this_frame, &pc))
+ return 0;
+
/* 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)
+ gdb_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 (this_frame,
+ func + i * tramp->insn_size,
+ buf, tramp->insn_size))
break;
- insn = extract_unsigned_integer (buf, tramp->insn_size);
- if (tramp->insn[i] != insn)
+ insn = extract_unsigned_integer (buf, tramp->insn_size, byte_order);
+ if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
break;
}
}
static int
tramp_frame_sniffer (const struct frame_unwind *self,
- struct frame_info *next_frame,
+ struct frame_info *this_frame,
void **this_cache)
{
const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
- CORE_ADDR pc = frame_pc_unwind (next_frame);
+ CORE_ADDR pc = get_frame_pc (this_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, this_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->stop_reason = default_frame_unwind_stop_reason;
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);
}
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