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a94dd1fd AC |
1 | /* Code dealing with register stack frames, for GDB, the GNU debugger. |
2 | ||
3 | Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, | |
4 | 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software | |
5 | 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 2 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, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | ||
25 | #include "defs.h" | |
26 | #include "regcache.h" | |
27 | #include "sentinel-frame.h" | |
28 | #include "inferior.h" | |
29 | #include "frame-unwind.h" | |
30 | ||
31 | struct frame_unwind_cache | |
32 | { | |
33 | struct regcache *regcache; | |
34 | }; | |
35 | ||
36 | void * | |
37 | sentinel_frame_cache (struct regcache *regcache) | |
38 | { | |
39 | struct frame_unwind_cache *cache = | |
40 | FRAME_OBSTACK_ZALLOC (struct frame_unwind_cache); | |
41 | cache->regcache = regcache; | |
42 | return cache; | |
43 | } | |
44 | ||
45 | /* Here the register value is taken direct from the register cache. */ | |
46 | ||
47 | void | |
48 | sentinel_frame_register_unwind (struct frame_info *frame, | |
49 | void **unwind_cache, | |
50 | int regnum, int *optimized, | |
51 | enum lval_type *lvalp, CORE_ADDR *addrp, | |
52 | int *realnum, void *bufferp) | |
53 | { | |
54 | struct frame_unwind_cache *cache = *unwind_cache; | |
55 | /* Describe the register's location. A reg-frame maps all registers | |
56 | onto the corresponding hardware register. */ | |
57 | *optimized = 0; | |
58 | *lvalp = lval_register; | |
59 | *addrp = REGISTER_BYTE (regnum); | |
60 | *realnum = regnum; | |
61 | ||
62 | /* If needed, find and return the value of the register. */ | |
63 | if (bufferp != NULL) | |
64 | { | |
65 | /* Return the actual value. */ | |
66 | /* Use the regcache_cooked_read() method so that it, on the fly, | |
67 | constructs either a raw or pseudo register from the raw | |
68 | register cache. */ | |
69 | regcache_cooked_read (cache->regcache, regnum, bufferp); | |
70 | } | |
71 | } | |
72 | ||
73 | CORE_ADDR | |
74 | sentinel_frame_pc_unwind (struct frame_info *frame, | |
75 | void **cache) | |
76 | { | |
77 | /* FIXME: cagney/2003-01-08: This should be using a per-architecture | |
78 | method that doesn't suffer from DECR_PC_AFTER_BREAK problems. | |
79 | Such a method would take unwind_cache, regcache and stop reason | |
80 | parameters. */ | |
81 | return read_pc (); | |
82 | } | |
83 | ||
84 | void | |
85 | sentinel_frame_id_unwind (struct frame_info *frame, | |
86 | void **cache, | |
87 | struct frame_id *id) | |
88 | { | |
89 | /* FIXME: cagney/2003-01-08: This should be using a per-architecture | |
90 | method that doesn't suffer from DECR_PC_AFTER_BREAK problems. | |
91 | Such a method would take unwind_cache, regcache and stop reason | |
92 | parameters. */ | |
93 | id->base = read_fp (); | |
94 | id->pc = read_pc (); | |
95 | } | |
96 | ||
97 | static void | |
98 | sentinel_frame_pop (struct frame_info *frame, | |
99 | void **cache, | |
100 | struct regcache *regcache) | |
101 | { | |
102 | internal_error (__FILE__, __LINE__, "Function sentinal_frame_pop called"); | |
103 | } | |
104 | ||
105 | const struct frame_unwind sentinel_frame_unwinder = | |
106 | { | |
107 | sentinel_frame_pop, | |
108 | sentinel_frame_pc_unwind, | |
109 | sentinel_frame_id_unwind, | |
110 | sentinel_frame_register_unwind | |
111 | }; | |
112 | ||
113 | const struct frame_unwind *const sentinel_frame_unwind = &sentinel_frame_unwinder; |