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/tmp/gdb-7.10/gdb/tramp-frame.h
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1 /* Signal trampoline unwinder.
2 
3  Copyright (C) 2004-2015 Free Software Foundation, Inc.
4 
5  This file is part of GDB.
6 
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 3 of the License, or
10  (at your option) any later version.
11 
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.
16 
17  You should have received a copy of the GNU General Public License
18  along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 
20 #ifndef TRAMP_FRAME_H
21 #define TRAMP_FRAME_H
22 
23 #include "frame.h" /* For "enum frame_type". */
24 
25 struct trad_frame;
26 struct frame_info;
27 struct trad_frame_cache;
28 
29 /* A trampoline consists of a small sequence of instructions placed at
30  an unspecified location in the inferior's address space. The only
31  identifying attribute of the trampoline's address is that it does
32  not fall inside an object file's section.
33 
34  The only way to identify a trampoline is to perform a brute force
35  examination of the instructions at and around the PC.
36 
37  This module provides a convenient interface for performing that
38  operation. */
39 
40 /* A trampoline descriptor. */
41 
42 /* Magic instruction that to mark the end of the signal trampoline
43  instruction sequence. */
44 #define TRAMP_SENTINEL_INSN ((LONGEST) -1)
45 
47 {
48  /* The trampoline's type, some a signal trampolines, some are normal
49  call-frame trampolines (aka thunks). */
51  /* The trampoline's entire instruction sequence. It consists of a
52  bytes/mask pair. Search for this in the inferior at or around
53  the frame's PC. It is assumed that the PC is INSN_SIZE aligned,
54  and that each element of TRAMP contains one INSN_SIZE
55  instruction. It is also assumed that INSN[0] contains the first
56  instruction of the trampoline and hence the address of the
57  instruction matching INSN[0] is the trampoline's "func" address.
58  The instruction sequence is terminated by
59  TRAMP_SENTINEL_INSN. */
60  int insn_size;
61  struct
62  {
65  } insn[48];
66  /* Initialize a trad-frame cache corresponding to the tramp-frame.
67  FUNC is the address of the instruction TRAMP[0] in memory. */
68  void (*init) (const struct tramp_frame *self,
69  struct frame_info *this_frame,
70  struct trad_frame_cache *this_cache,
71  CORE_ADDR func);
72  /* Return non-zero if the tramp-frame is valid for the PC requested.
73  Adjust the PC to point to the address to check the instruction
74  sequence against if required. If this is NULL, then the tramp-frame
75  is valid for any PC. */
76  int (*validate) (const struct tramp_frame *self,
77  struct frame_info *this_frame,
78  CORE_ADDR *pc);
79 };
80 
82  const struct tramp_frame *tramp);
83 
84 #endif
bfd_vma CORE_ADDR
Definition: common-types.h:41
ULONGEST bytes
Definition: tramp-frame.h:63
void(* func)(char *)
void tramp_frame_prepend_unwinder(struct gdbarch *gdbarch, const struct tramp_frame *tramp)
Definition: tramp-frame.c:145
frame_type
Definition: frame.h:231
enum frame_type frame_type
Definition: tramp-frame.h:50
ULONGEST mask
Definition: tramp-frame.h:64
struct tramp_frame::@170 insn[48]
const char const char int
Definition: command.h:229
void(* init)(const struct tramp_frame *self, struct frame_info *this_frame, struct trad_frame_cache *this_cache, CORE_ADDR func)
Definition: tramp-frame.h:68
unsigned long long ULONGEST
Definition: common-types.h:53
int(* validate)(const struct tramp_frame *self, struct frame_info *this_frame, CORE_ADDR *pc)
Definition: tramp-frame.h:76