1 /* Code dealing with register stack frames, for GDB, the GNU debugger.
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.
7 This file is part of GDB.
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.
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.
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/>. */
25 #include "sentinel-frame.h"
27 #include "frame-unwind.h"
29 struct frame_unwind_cache
31 struct regcache *regcache;
35 sentinel_frame_cache (struct regcache *regcache)
37 struct frame_unwind_cache *cache =
38 FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache);
40 cache->regcache = regcache;
44 /* Here the register value is taken direct from the register cache. */
47 sentinel_frame_prev_register (struct frame_info *this_frame,
48 void **this_prologue_cache,
51 struct gdbarch *gdbarch = get_frame_arch (this_frame);
52 struct frame_unwind_cache *cache = *this_prologue_cache;
55 /* Return the actual value. */
56 value = allocate_value (register_type (gdbarch, regnum));
57 VALUE_LVAL (value) = lval_register;
58 VALUE_REGNUM (value) = regnum;
59 VALUE_FRAME_ID (value) = get_frame_id (this_frame);
61 /* Use the regcache_cooked_read() method so that it, on the fly,
62 constructs either a raw or pseudo register from the raw
64 if (regcache_cooked_read (cache->regcache,
66 value_contents_raw (value)) == REG_UNAVAILABLE)
67 mark_value_bytes_unavailable (value, 0, register_size (gdbarch, regnum));
73 sentinel_frame_this_id (struct frame_info *this_frame,
74 void **this_prologue_cache,
75 struct frame_id *this_id)
77 /* The sentinel frame is used as a starting point for creating the
78 previous (inner most) frame. That frame's THIS_ID method will be
79 called to determine the inner most frame's ID. Not this one. */
80 internal_error (__FILE__, __LINE__, _("sentinel_frame_this_id called"));
83 static struct gdbarch *
84 sentinel_frame_prev_arch (struct frame_info *this_frame,
85 void **this_prologue_cache)
87 struct frame_unwind_cache *cache = *this_prologue_cache;
89 return get_regcache_arch (cache->regcache);
92 const struct frame_unwind sentinel_frame_unwind =
95 sentinel_frame_this_id,
96 sentinel_frame_prev_register,
100 sentinel_frame_prev_arch,