sim: bfin: add support for glued SIC interrupt lines
[deliverable/binutils-gdb.git] / gdb / sentinel-frame.c
1 /* Code dealing with register stack frames, for GDB, the GNU debugger.
2
3 Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
4 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2007, 2008, 2009, 2010, 2011
5 Free Software Foundation, Inc.
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
11 the Free Software Foundation; either version 3 of the License, or
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
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
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);
39
40 cache->regcache = regcache;
41 return cache;
42 }
43
44 /* Here the register value is taken direct from the register cache. */
45
46 static struct value *
47 sentinel_frame_prev_register (struct frame_info *this_frame,
48 void **this_prologue_cache,
49 int regnum)
50 {
51 struct gdbarch *gdbarch = get_frame_arch (this_frame);
52 struct frame_unwind_cache *cache = *this_prologue_cache;
53 struct value *value;
54 struct type *regtype = register_type (gdbarch, regnum);
55
56 /* Return the actual value. */
57 value = allocate_value (regtype);
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. */
65 if (regcache_cooked_read (cache->regcache,
66 regnum,
67 value_contents_raw (value)) == REG_UNAVAILABLE)
68 mark_value_bytes_unavailable (value, 0, TYPE_LENGTH (regtype));
69
70 return value;
71 }
72
73 static void
74 sentinel_frame_this_id (struct frame_info *this_frame,
75 void **this_prologue_cache,
76 struct frame_id *this_id)
77 {
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. */
81 internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
82 }
83
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;
89
90 return get_regcache_arch (cache->regcache);
91 }
92
93 const struct frame_unwind sentinel_frame_unwind =
94 {
95 SENTINEL_FRAME,
96 default_frame_unwind_stop_reason,
97 sentinel_frame_this_id,
98 sentinel_frame_prev_register,
99 NULL,
100 NULL,
101 NULL,
102 sentinel_frame_prev_arch,
103 };
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