1 /* Signal trampoline unwinder, for GDB the GNU Debugger.
3 Copyright 2004 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
23 #include "tramp-frame.h"
24 #include "frame-unwind.h"
29 #include "trad-frame.h"
30 #include "frame-base.h"
34 const struct tramp_frame *tramp_frame;
37 struct tramp_frame_cache
40 const struct tramp_frame *tramp_frame;
41 struct trad_frame_cache *trad_cache;
44 static struct trad_frame_cache *
45 tramp_frame_cache (struct frame_info *next_frame,
48 CORE_ADDR pc = frame_pc_unwind (next_frame);
49 struct tramp_frame_cache *tramp_cache = (*this_cache);
50 if (tramp_cache->trad_cache == NULL)
52 tramp_cache->trad_cache = trad_frame_cache_zalloc (next_frame);
53 tramp_cache->tramp_frame->init (tramp_cache->tramp_frame,
55 tramp_cache->trad_cache,
58 return tramp_cache->trad_cache;
62 tramp_frame_this_id (struct frame_info *next_frame,
64 struct frame_id *this_id)
66 struct trad_frame_cache *trad_cache
67 = tramp_frame_cache (next_frame, this_cache);
68 trad_frame_get_id (trad_cache, this_id);
72 tramp_frame_prev_register (struct frame_info *next_frame,
76 enum lval_type * lvalp,
78 int *realnump, void *valuep)
80 struct trad_frame_cache *trad_cache
81 = tramp_frame_cache (next_frame, this_cache);
82 trad_frame_get_register (trad_cache, next_frame, prev_regnum, optimizedp,
83 lvalp, addrp, realnump, valuep);
87 tramp_frame_start (CORE_ADDR pc, const struct tramp_frame *tramp)
90 /* Search through the trampoline for one that matches the
91 instruction sequence around PC. */
92 for (ti = 0; tramp->insn[ti] != 0; ti++)
94 CORE_ADDR func = pc - tramp->insn_size * ti;
98 bfd_byte buf[sizeof (LONGEST)];
100 if (tramp->insn[i] == 0)
102 if (target_read_memory (func + i * tramp->insn_size, buf,
103 tramp->insn_size) != 0)
105 insn = extract_unsigned_integer (buf, tramp->insn_size);
106 if (tramp->insn[i] != insn)
110 /* Trampoline doesn't match. */
115 tramp_frame_sniffer (const struct frame_unwind *self,
116 struct frame_info *next_frame,
119 const struct tramp_frame *tramp = self->unwind_data->tramp_frame;
120 CORE_ADDR pc = frame_pc_unwind (next_frame);
123 struct tramp_frame_cache *tramp_cache;
125 /* If the function has a valid symbol name, it isn't a
127 find_pc_partial_function (pc, &name, NULL, NULL);
130 /* If the function lives in a valid section (even without a starting
131 point) it isn't a trampoline. */
132 if (find_pc_section (pc) != NULL)
134 /* Finally, check that the trampoline matches at PC. */
135 func = tramp_frame_start (pc, tramp);
138 tramp_cache = FRAME_OBSTACK_ZALLOC (struct tramp_frame_cache);
139 tramp_cache->func = func;
140 tramp_cache->tramp_frame = tramp;
141 (*this_cache) = tramp_cache;
146 tramp_frame_append (struct gdbarch *gdbarch,
147 const struct tramp_frame *tramp_frame)
149 struct frame_data *data;
150 struct frame_unwind *unwinder;
152 data = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_data);
153 unwinder = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct frame_unwind);
155 data->tramp_frame = tramp_frame;
156 unwinder->type = SIGTRAMP_FRAME;
157 unwinder->unwind_data = data;
158 unwinder->sniffer = tramp_frame_sniffer;
159 unwinder->this_id = tramp_frame_this_id;
160 unwinder->prev_register = tramp_frame_prev_register;
161 frame_unwind_register_unwinder (gdbarch, unwinder);