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
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
);
39 cache
->regcache
= regcache
;
43 /* Here the register value is taken direct from the register cache. */
46 sentinel_frame_prev_register (struct frame_info
*next_frame
,
47 void **this_prologue_cache
,
48 int regnum
, int *optimized
,
49 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
50 int *realnum
, gdb_byte
*bufferp
)
52 struct frame_unwind_cache
*cache
= *this_prologue_cache
;
53 /* Describe the register's location. A reg-frame maps all registers
54 onto the corresponding hardware register. */
56 *lvalp
= lval_register
;
57 *addrp
= register_offset_hack (current_gdbarch
, regnum
);
60 /* If needed, find and return the value of the register. */
63 /* Return the actual value. */
64 /* Use the regcache_cooked_read() method so that it, on the fly,
65 constructs either a raw or pseudo register from the raw
67 regcache_cooked_read (cache
->regcache
, regnum
, bufferp
);
72 sentinel_frame_this_id (struct frame_info
*next_frame
,
73 void **this_prologue_cache
,
74 struct frame_id
*this_id
)
76 /* The sentinel frame is used as a starting point for creating the
77 previous (inner most) frame. That frame's THIS_ID method will be
78 called to determine the inner most frame's ID. Not this one. */
79 internal_error (__FILE__
, __LINE__
, _("sentinel_frame_this_id called"));
83 sentinel_frame_prev_pc (struct frame_info
*next_frame
,
84 void **this_prologue_cache
)
86 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
87 return gdbarch_unwind_pc (gdbarch
, next_frame
);
90 const struct frame_unwind sentinel_frame_unwinder
=
93 sentinel_frame_this_id
,
94 sentinel_frame_prev_register
,
95 NULL
, /* unwind_data */
97 sentinel_frame_prev_pc
,
100 const struct frame_unwind
*const sentinel_frame_unwind
= &sentinel_frame_unwinder
;