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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-6.8/] [gdb/] [tramp-frame.c] - Diff between revs 827 and 840

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/* Signal trampoline unwinder, for GDB the GNU Debugger.
/* Signal trampoline unwinder, for GDB the GNU Debugger.
 
 
   Copyright (C) 2004, 2007, 2008 Free Software Foundation, Inc.
   Copyright (C) 2004, 2007, 2008 Free Software Foundation, Inc.
 
 
   This file is part of GDB.
   This file is part of GDB.
 
 
   This program is free software; you can redistribute it and/or modify
   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
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   (at your option) any later version.
 
 
   This program is distributed in the hope that it will be useful,
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   GNU General Public License for more details.
 
 
   You should have received a copy of the GNU General Public License
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 
#include "defs.h"
#include "defs.h"
#include "tramp-frame.h"
#include "tramp-frame.h"
#include "frame-unwind.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "gdbcore.h"
#include "symtab.h"
#include "symtab.h"
#include "objfiles.h"
#include "objfiles.h"
#include "target.h"
#include "target.h"
#include "trad-frame.h"
#include "trad-frame.h"
#include "frame-base.h"
#include "frame-base.h"
#include "gdb_assert.h"
#include "gdb_assert.h"
 
 
struct frame_data
struct frame_data
{
{
  const struct tramp_frame *tramp_frame;
  const struct tramp_frame *tramp_frame;
};
};
 
 
struct tramp_frame_cache
struct tramp_frame_cache
{
{
  CORE_ADDR func;
  CORE_ADDR func;
  const struct tramp_frame *tramp_frame;
  const struct tramp_frame *tramp_frame;
  struct trad_frame_cache *trad_cache;
  struct trad_frame_cache *trad_cache;
};
};
 
 
static struct trad_frame_cache *
static struct trad_frame_cache *
tramp_frame_cache (struct frame_info *next_frame,
tramp_frame_cache (struct frame_info *next_frame,
                   void **this_cache)
                   void **this_cache)
{
{
  CORE_ADDR pc = frame_pc_unwind (next_frame);
  CORE_ADDR pc = frame_pc_unwind (next_frame);
  struct tramp_frame_cache *tramp_cache = (*this_cache);
  struct tramp_frame_cache *tramp_cache = (*this_cache);
  if (tramp_cache->trad_cache == NULL)
  if (tramp_cache->trad_cache == NULL)
    {
    {
      tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
      tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
      tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
      tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
                                      next_frame,
                                      next_frame,
                                      tramp_cache->trad_cache,
                                      tramp_cache->trad_cache,
                                      tramp_cache->func);
                                      tramp_cache->func);
    }
    }
  return tramp_cache->trad_cache;
  return tramp_cache->trad_cache;
}
}
 
 
static void
static void
tramp_frame_this_id (struct frame_info *next_frame,
tramp_frame_this_id (struct frame_info *next_frame,
                     void **this_cache,
                     void **this_cache,
                     struct frame_id *this_id)
                     struct frame_id *this_id)
{
{
  struct trad_frame_cache *trad_cache
  struct trad_frame_cache *trad_cache
    = tramp_frame_cache (next_frame, this_cache);
    = tramp_frame_cache (next_frame, this_cache);
  trad_frame_get_id (trad_cache, this_id);
  trad_frame_get_id (trad_cache, this_id);
}
}
 
 
static void
static void
tramp_frame_prev_register (struct frame_info *next_frame,
tramp_frame_prev_register (struct frame_info *next_frame,
                           void **this_cache,
                           void **this_cache,
                           int prev_regnum,
                           int prev_regnum,
                           int *optimizedp,
                           int *optimizedp,
                           enum lval_type * lvalp,
                           enum lval_type * lvalp,
                           CORE_ADDR *addrp,
                           CORE_ADDR *addrp,
                           int *realnump, gdb_byte *valuep)
                           int *realnump, gdb_byte *valuep)
{
{
  struct trad_frame_cache *trad_cache
  struct trad_frame_cache *trad_cache
    = tramp_frame_cache (next_frame, this_cache);
    = tramp_frame_cache (next_frame, this_cache);
  trad_frame_get_register (trad_cache, next_frame, prev_regnum, optimizedp,
  trad_frame_get_register (trad_cache, next_frame, prev_regnum, optimizedp,
                           lvalp, addrp, realnump, valuep);
                           lvalp, addrp, realnump, valuep);
}
}
 
 
static CORE_ADDR
static CORE_ADDR
tramp_frame_start (const struct tramp_frame *tramp,
tramp_frame_start (const struct tramp_frame *tramp,
                   struct frame_info *next_frame, CORE_ADDR pc)
                   struct frame_info *next_frame, CORE_ADDR pc)
{
{
  int ti;
  int ti;
  /* Search through the trampoline for one that matches the
  /* Search through the trampoline for one that matches the
     instruction sequence around PC.  */
     instruction sequence around PC.  */
  for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
  for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
    {
    {
      CORE_ADDR func = pc - tramp->insn_size * ti;
      CORE_ADDR func = pc - tramp->insn_size * ti;
      int i;
      int i;
      for (i = 0; 1; i++)
      for (i = 0; 1; i++)
        {
        {
          gdb_byte buf[sizeof (tramp->insn[0])];
          gdb_byte buf[sizeof (tramp->insn[0])];
          ULONGEST insn;
          ULONGEST insn;
          if (tramp->insn[i].bytes == TRAMP_SENTINEL_INSN)
          if (tramp->insn[i].bytes == TRAMP_SENTINEL_INSN)
            return func;
            return func;
          if (!safe_frame_unwind_memory (next_frame,
          if (!safe_frame_unwind_memory (next_frame,
                                         func + i * tramp->insn_size,
                                         func + i * tramp->insn_size,
                                         buf, tramp->insn_size))
                                         buf, tramp->insn_size))
            break;
            break;
          insn = extract_unsigned_integer (buf, tramp->insn_size);
          insn = extract_unsigned_integer (buf, tramp->insn_size);
          if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
          if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
            break;
            break;
        }
        }
    }
    }
  /* Trampoline doesn't match.  */
  /* Trampoline doesn't match.  */
  return 0;
  return 0;
}
}
 
 
static int
static int
tramp_frame_sniffer (const struct frame_unwind *self,
tramp_frame_sniffer (const struct frame_unwind *self,
                     struct frame_info *next_frame,
                     struct frame_info *next_frame,
                     void **this_cache)
                     void **this_cache)
{
{
  const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
  const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
  CORE_ADDR pc = frame_pc_unwind (next_frame);
  CORE_ADDR pc = frame_pc_unwind (next_frame);
  CORE_ADDR func;
  CORE_ADDR func;
  struct tramp_frame_cache *tramp_cache;
  struct tramp_frame_cache *tramp_cache;
 
 
  /* tausq/2004-12-12: We used to assume if pc has a name or is in a valid
  /* 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
     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
     false on HPUX which has a signal trampoline that has a name; it can
     also be false when using an alternative signal stack.  */
     also be false when using an alternative signal stack.  */
  func = tramp_frame_start (tramp, next_frame, pc);
  func = tramp_frame_start (tramp, next_frame, pc);
  if (func == 0)
  if (func == 0)
    return 0;
    return 0;
  tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
  tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
  tramp_cache->func = func;
  tramp_cache->func = func;
  tramp_cache->tramp_frame = tramp;
  tramp_cache->tramp_frame = tramp;
  (*this_cache) = tramp_cache;
  (*this_cache) = tramp_cache;
  return 1;
  return 1;
}
}
 
 
void
void
tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
                              const struct tramp_frame *tramp_frame)
                              const struct tramp_frame *tramp_frame)
{
{
  struct frame_data *data;
  struct frame_data *data;
  struct frame_unwind *unwinder;
  struct frame_unwind *unwinder;
  int i;
  int i;
 
 
  /* Check that the instruction sequence contains a sentinel.  */
  /* Check that the instruction sequence contains a sentinel.  */
  for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
  for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
    {
    {
      if (tramp_frame->insn[i].bytes == TRAMP_SENTINEL_INSN)
      if (tramp_frame->insn[i].bytes == TRAMP_SENTINEL_INSN)
        break;
        break;
    }
    }
  gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
  gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
  gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0].bytes));
  gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0].bytes));
 
 
  data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
  data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
  unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
  unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
 
 
  data->tramp_frame = tramp_frame;
  data->tramp_frame = tramp_frame;
  unwinder->type = tramp_frame->frame_type;
  unwinder->type = tramp_frame->frame_type;
  unwinder->unwind_data = data;
  unwinder->unwind_data = data;
  unwinder->sniffer = tramp_frame_sniffer;
  unwinder->sniffer = tramp_frame_sniffer;
  unwinder->this_id = tramp_frame_this_id;
  unwinder->this_id = tramp_frame_this_id;
  unwinder->prev_register = tramp_frame_prev_register;
  unwinder->prev_register = tramp_frame_prev_register;
  frame_unwind_prepend_unwinder (gdbarch, unwinder);
  frame_unwind_prepend_unwinder (gdbarch, unwinder);
}
}
 
 

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