Commit | Line | Data |
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a94dd1fd AC |
1 | /* Code dealing with register stack frames, for GDB, the GNU debugger. |
2 | ||
6aba47ca | 3 | Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, |
7b6bb8da | 4 | 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2008, 2009, 2010, 2011 |
6aba47ca | 5 | Free Software Foundation, Inc. |
a94dd1fd AC |
6 | |
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
a94dd1fd AC |
12 | (at your option) any later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
a94dd1fd AC |
21 | |
22 | ||
23 | #include "defs.h" | |
24 | #include "regcache.h" | |
25 | #include "sentinel-frame.h" | |
26 | #include "inferior.h" | |
27 | #include "frame-unwind.h" | |
28 | ||
29 | struct frame_unwind_cache | |
30 | { | |
31 | struct regcache *regcache; | |
32 | }; | |
33 | ||
34 | void * | |
35 | sentinel_frame_cache (struct regcache *regcache) | |
36 | { | |
37 | struct frame_unwind_cache *cache = | |
38 | FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache); | |
433759f7 | 39 | |
a94dd1fd AC |
40 | cache->regcache = regcache; |
41 | return cache; | |
42 | } | |
43 | ||
44 | /* Here the register value is taken direct from the register cache. */ | |
45 | ||
669fac23 DJ |
46 | static struct value * |
47 | sentinel_frame_prev_register (struct frame_info *this_frame, | |
6dc42492 | 48 | void **this_prologue_cache, |
669fac23 | 49 | int regnum) |
a94dd1fd | 50 | { |
669fac23 | 51 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
6dc42492 | 52 | struct frame_unwind_cache *cache = *this_prologue_cache; |
669fac23 | 53 | struct value *value; |
8fbca658 | 54 | struct type *regtype = register_type (gdbarch, regnum); |
669fac23 DJ |
55 | |
56 | /* Return the actual value. */ | |
8fbca658 | 57 | value = allocate_value (regtype); |
669fac23 DJ |
58 | VALUE_LVAL (value) = lval_register; |
59 | VALUE_REGNUM (value) = regnum; | |
60 | VALUE_FRAME_ID (value) = get_frame_id (this_frame); | |
61 | ||
62 | /* Use the regcache_cooked_read() method so that it, on the fly, | |
63 | constructs either a raw or pseudo register from the raw | |
64 | register cache. */ | |
0fdb4f18 PA |
65 | if (regcache_cooked_read (cache->regcache, |
66 | regnum, | |
67 | value_contents_raw (value)) == REG_UNAVAILABLE) | |
8fbca658 | 68 | mark_value_bytes_unavailable (value, 0, TYPE_LENGTH (regtype)); |
669fac23 DJ |
69 | |
70 | return value; | |
a94dd1fd AC |
71 | } |
72 | ||
b9362cc7 | 73 | static void |
669fac23 | 74 | sentinel_frame_this_id (struct frame_info *this_frame, |
6dc42492 AC |
75 | void **this_prologue_cache, |
76 | struct frame_id *this_id) | |
a94dd1fd | 77 | { |
6dc42492 AC |
78 | /* The sentinel frame is used as a starting point for creating the |
79 | previous (inner most) frame. That frame's THIS_ID method will be | |
80 | called to determine the inner most frame's ID. Not this one. */ | |
e2e0b3e5 | 81 | internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called")); |
a94dd1fd AC |
82 | } |
83 | ||
36f15f55 UW |
84 | static struct gdbarch * |
85 | sentinel_frame_prev_arch (struct frame_info *this_frame, | |
86 | void **this_prologue_cache) | |
87 | { | |
88 | struct frame_unwind_cache *cache = *this_prologue_cache; | |
433759f7 | 89 | |
36f15f55 UW |
90 | return get_regcache_arch (cache->regcache); |
91 | } | |
92 | ||
39d7b0e2 | 93 | const struct frame_unwind sentinel_frame_unwind = |
a94dd1fd | 94 | { |
0e100dab | 95 | SENTINEL_FRAME, |
8fbca658 | 96 | default_frame_unwind_stop_reason, |
6dc42492 | 97 | sentinel_frame_this_id, |
36f15f55 UW |
98 | sentinel_frame_prev_register, |
99 | NULL, | |
100 | NULL, | |
101 | NULL, | |
102 | sentinel_frame_prev_arch, | |
a94dd1fd | 103 | }; |