/* Signal trampoline unwinder, for GDB the GNU Debugger.
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/* Signal trampoline unwinder, for GDB the GNU Debugger.
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Copyright (C) 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Copyright (C) 2004, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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This file is part of GDB.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "defs.h"
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#include "tramp-frame.h"
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#include "tramp-frame.h"
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#include "frame-unwind.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "gdbcore.h"
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#include "symtab.h"
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#include "symtab.h"
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#include "objfiles.h"
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#include "objfiles.h"
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#include "target.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "trad-frame.h"
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#include "frame-base.h"
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#include "frame-base.h"
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#include "gdb_assert.h"
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#include "gdb_assert.h"
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struct frame_data
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struct frame_data
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{
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{
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const struct tramp_frame *tramp_frame;
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const struct tramp_frame *tramp_frame;
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};
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};
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struct tramp_frame_cache
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struct tramp_frame_cache
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{
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{
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CORE_ADDR func;
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CORE_ADDR func;
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const struct tramp_frame *tramp_frame;
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const struct tramp_frame *tramp_frame;
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struct trad_frame_cache *trad_cache;
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struct trad_frame_cache *trad_cache;
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};
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};
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static struct trad_frame_cache *
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static struct trad_frame_cache *
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tramp_frame_cache (struct frame_info *this_frame,
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tramp_frame_cache (struct frame_info *this_frame,
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void **this_cache)
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void **this_cache)
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{
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{
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR pc = get_frame_pc (this_frame);
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struct tramp_frame_cache *tramp_cache = (*this_cache);
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struct tramp_frame_cache *tramp_cache = (*this_cache);
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if (tramp_cache->trad_cache == NULL)
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if (tramp_cache->trad_cache == NULL)
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{
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{
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tramp_cache->trad_cache = trad_frame_cache_zalloc (this_frame);
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tramp_cache->trad_cache = trad_frame_cache_zalloc (this_frame);
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tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
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tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
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this_frame,
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this_frame,
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tramp_cache->trad_cache,
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tramp_cache->trad_cache,
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tramp_cache->func);
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tramp_cache->func);
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}
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}
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return tramp_cache->trad_cache;
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return tramp_cache->trad_cache;
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}
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}
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static void
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static void
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tramp_frame_this_id (struct frame_info *this_frame,
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tramp_frame_this_id (struct frame_info *this_frame,
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void **this_cache,
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void **this_cache,
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struct frame_id *this_id)
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struct frame_id *this_id)
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{
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{
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struct trad_frame_cache *trad_cache
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struct trad_frame_cache *trad_cache
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= tramp_frame_cache (this_frame, this_cache);
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= tramp_frame_cache (this_frame, this_cache);
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trad_frame_get_id (trad_cache, this_id);
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trad_frame_get_id (trad_cache, this_id);
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}
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}
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static struct value *
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static struct value *
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tramp_frame_prev_register (struct frame_info *this_frame,
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tramp_frame_prev_register (struct frame_info *this_frame,
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void **this_cache,
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void **this_cache,
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int prev_regnum)
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int prev_regnum)
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{
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{
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struct trad_frame_cache *trad_cache
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struct trad_frame_cache *trad_cache
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= tramp_frame_cache (this_frame, this_cache);
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= tramp_frame_cache (this_frame, this_cache);
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return trad_frame_get_register (trad_cache, this_frame, prev_regnum);
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return trad_frame_get_register (trad_cache, this_frame, prev_regnum);
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}
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}
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static CORE_ADDR
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static CORE_ADDR
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tramp_frame_start (const struct tramp_frame *tramp,
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tramp_frame_start (const struct tramp_frame *tramp,
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struct frame_info *this_frame, CORE_ADDR pc)
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struct frame_info *this_frame, CORE_ADDR pc)
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{
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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int ti;
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int ti;
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/* Search through the trampoline for one that matches the
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/* Search through the trampoline for one that matches the
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instruction sequence around PC. */
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instruction sequence around PC. */
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for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
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for (ti = 0; tramp->insn[ti].bytes != TRAMP_SENTINEL_INSN; ti++)
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{
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{
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CORE_ADDR func = pc - tramp->insn_size * ti;
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CORE_ADDR func = pc - tramp->insn_size * ti;
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int i;
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int i;
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for (i = 0; 1; i++)
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for (i = 0; 1; i++)
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{
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{
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gdb_byte buf[sizeof (tramp->insn[0])];
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gdb_byte buf[sizeof (tramp->insn[0])];
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ULONGEST insn;
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ULONGEST insn;
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if (tramp->insn[i].bytes == TRAMP_SENTINEL_INSN)
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if (tramp->insn[i].bytes == TRAMP_SENTINEL_INSN)
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return func;
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return func;
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if (!safe_frame_unwind_memory (this_frame,
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if (!safe_frame_unwind_memory (this_frame,
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func + i * tramp->insn_size,
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func + i * tramp->insn_size,
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buf, tramp->insn_size))
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buf, tramp->insn_size))
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break;
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break;
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insn = extract_unsigned_integer (buf, tramp->insn_size, byte_order);
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insn = extract_unsigned_integer (buf, tramp->insn_size, byte_order);
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if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
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if (tramp->insn[i].bytes != (insn & tramp->insn[i].mask))
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break;
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break;
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}
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}
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}
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}
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/* Trampoline doesn't match. */
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/* Trampoline doesn't match. */
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return 0;
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return 0;
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}
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}
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static int
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static int
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tramp_frame_sniffer (const struct frame_unwind *self,
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tramp_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *this_frame,
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struct frame_info *this_frame,
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void **this_cache)
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void **this_cache)
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{
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{
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const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
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const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR pc = get_frame_pc (this_frame);
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CORE_ADDR func;
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CORE_ADDR func;
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struct tramp_frame_cache *tramp_cache;
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struct tramp_frame_cache *tramp_cache;
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/* tausq/2004-12-12: We used to assume if pc has a name or is in a valid
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/* tausq/2004-12-12: We used to assume if pc has a name or is in a valid
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section, then this is not a trampoline. However, this assumption is
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section, then this is not a trampoline. However, this assumption is
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false on HPUX which has a signal trampoline that has a name; it can
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false on HPUX which has a signal trampoline that has a name; it can
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also be false when using an alternative signal stack. */
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also be false when using an alternative signal stack. */
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func = tramp_frame_start (tramp, this_frame, pc);
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func = tramp_frame_start (tramp, this_frame, pc);
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if (func == 0)
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if (func == 0)
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return 0;
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return 0;
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tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
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tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
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tramp_cache->func = func;
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tramp_cache->func = func;
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tramp_cache->tramp_frame = tramp;
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tramp_cache->tramp_frame = tramp;
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(*this_cache) = tramp_cache;
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(*this_cache) = tramp_cache;
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return 1;
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return 1;
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}
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}
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void
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void
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tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
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tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
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const struct tramp_frame *tramp_frame)
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const struct tramp_frame *tramp_frame)
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{
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{
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struct frame_data *data;
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struct frame_data *data;
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struct frame_unwind *unwinder;
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struct frame_unwind *unwinder;
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int i;
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int i;
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/* Check that the instruction sequence contains a sentinel. */
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/* Check that the instruction sequence contains a sentinel. */
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for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
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for (i = 0; i < ARRAY_SIZE (tramp_frame->insn); i++)
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{
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{
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if (tramp_frame->insn[i].bytes == TRAMP_SENTINEL_INSN)
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if (tramp_frame->insn[i].bytes == TRAMP_SENTINEL_INSN)
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break;
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break;
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}
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}
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gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
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gdb_assert (i < ARRAY_SIZE (tramp_frame->insn));
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gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0].bytes));
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gdb_assert (tramp_frame->insn_size <= sizeof (tramp_frame->insn[0].bytes));
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data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
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data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
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unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
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unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
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data->tramp_frame = tramp_frame;
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data->tramp_frame = tramp_frame;
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unwinder->type = tramp_frame->frame_type;
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unwinder->type = tramp_frame->frame_type;
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unwinder->unwind_data = data;
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unwinder->unwind_data = data;
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unwinder->sniffer = tramp_frame_sniffer;
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unwinder->sniffer = tramp_frame_sniffer;
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unwinder->this_id = tramp_frame_this_id;
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unwinder->this_id = tramp_frame_this_id;
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unwinder->prev_register = tramp_frame_prev_register;
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unwinder->prev_register = tramp_frame_prev_register;
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frame_unwind_prepend_unwinder (gdbarch, unwinder);
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frame_unwind_prepend_unwinder (gdbarch, unwinder);
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}
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}
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