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c906108c SS |
1 | /* Definitions for dealing with stack frames, for GDB, the GNU debugger. |
2 | Copyright 1986, 1989, 1991, 1992, 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | #if !defined (FRAME_H) | |
21 | #define FRAME_H 1 | |
22 | ||
23 | /* Describe the saved registers of a frame. */ | |
24 | ||
25 | #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS) | |
26 | /* XXXX - deprecated */ | |
27 | struct frame_saved_regs | |
28 | { | |
29 | ||
30 | /* For each register, address of where it was saved on entry to | |
31 | the frame, or zero if it was not saved on entry to this frame. | |
32 | This includes special registers such as pc and fp saved in | |
33 | special ways in the stack frame. The SP_REGNUM is even more | |
34 | special, the address here is the sp for the next frame, not the | |
35 | address where the sp was saved. */ | |
36 | ||
37 | CORE_ADDR regs[NUM_REGS]; | |
38 | }; | |
39 | #endif | |
40 | ||
41 | /* We keep a cache of stack frames, each of which is a "struct | |
42 | frame_info". The innermost one gets allocated (in | |
43 | wait_for_inferior) each time the inferior stops; current_frame | |
44 | points to it. Additional frames get allocated (in | |
45 | get_prev_frame_info) as needed, and are chained through the next | |
46 | and prev fields. Any time that the frame cache becomes invalid | |
47 | (most notably when we execute something, but also if we change how | |
48 | we interpret the frames (e.g. "set heuristic-fence-post" in | |
49 | mips-tdep.c, or anything which reads new symbols)), we should call | |
50 | reinit_frame_cache. */ | |
51 | ||
52 | struct frame_info | |
53 | { | |
54 | /* Nominal address of the frame described. See comments at FRAME_FP | |
55 | about what this means outside the *FRAME* macros; in the *FRAME* | |
56 | macros, it can mean whatever makes most sense for this machine. */ | |
57 | CORE_ADDR frame; | |
58 | ||
59 | /* Address at which execution is occurring in this frame. | |
60 | For the innermost frame, it's the current pc. | |
61 | For other frames, it is a pc saved in the next frame. */ | |
62 | CORE_ADDR pc; | |
63 | ||
64 | /* Nonzero if this is a frame associated with calling a signal handler. | |
65 | ||
66 | Set by machine-dependent code. On some machines, if | |
67 | the machine-dependent code fails to check for this, the backtrace | |
68 | will look relatively normal. For example, on the i386 | |
69 | #3 0x158728 in sighold () | |
70 | On other machines (e.g. rs6000), the machine-dependent code better | |
71 | set this to prevent us from trying to print it like a normal frame. */ | |
72 | int signal_handler_caller; | |
73 | ||
74 | /* For each register, address of where it was saved on entry to | |
75 | the frame, or zero if it was not saved on entry to this frame. | |
76 | This includes special registers such as pc and fp saved in | |
77 | special ways in the stack frame. The SP_REGNUM is even more | |
78 | special, the address here is the sp for the next frame, not the | |
79 | address where the sp was saved. */ | |
80 | /* Allocated by frame_saved_regs_zalloc () which is called / | |
81 | initialized by FRAME_INIT_SAVED_REGS(). */ | |
82 | CORE_ADDR *saved_regs; /*NUM_REGS*/ | |
83 | ||
84 | #ifdef EXTRA_FRAME_INFO | |
85 | /* XXXX - deprecated */ | |
86 | /* Anything extra for this structure that may have been defined | |
87 | in the machine dependent files. */ | |
88 | EXTRA_FRAME_INFO | |
89 | #endif | |
90 | ||
91 | /* Anything extra for this structure that may have been defined | |
92 | in the machine dependent files. */ | |
93 | /* Allocated by frame_obstack_alloc () which is called / | |
94 | initialized by INIT_EXTRA_FRAME_INFO */ | |
95 | struct frame_extra_info *extra_info; | |
96 | ||
97 | /* Pointers to the next and previous frame_info's in the frame cache. */ | |
98 | struct frame_info *next, *prev; | |
99 | }; | |
100 | ||
101 | /* Allocate additional space for appendices to a struct frame_info. */ | |
102 | ||
103 | #ifndef SIZEOF_FRAME_SAVED_REGS | |
104 | #define SIZEOF_FRAME_SAVED_REGS (sizeof (CORE_ADDR) * (NUM_REGS)) | |
105 | #endif | |
106 | extern void *frame_obstack_alloc PARAMS ((unsigned long size)); | |
107 | extern void frame_saved_regs_zalloc PARAMS ((struct frame_info *)); | |
108 | ||
109 | /* Dummy frame. This saves the processor state just prior to setting up the | |
110 | inferior function call. On most targets, the registers are saved on the | |
111 | target stack, but that really slows down function calls. */ | |
112 | ||
113 | struct dummy_frame | |
114 | { | |
115 | struct dummy_frame *next; | |
116 | ||
117 | CORE_ADDR pc; | |
118 | CORE_ADDR fp; | |
119 | CORE_ADDR sp; | |
120 | char regs[REGISTER_BYTES]; | |
121 | }; | |
122 | ||
123 | /* Return the frame address from FR. Except in the machine-dependent | |
124 | *FRAME* macros, a frame address has no defined meaning other than | |
125 | as a magic cookie which identifies a frame over calls to the | |
126 | inferior. The only known exception is inferior.h | |
127 | (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot | |
128 | assume that a frame address contains enough information to | |
129 | reconstruct the frame; if you want more than just to identify the | |
130 | frame (e.g. be able to fetch variables relative to that frame), | |
131 | then save the whole struct frame_info (and the next struct | |
132 | frame_info, since the latter is used for fetching variables on some | |
133 | machines). */ | |
134 | ||
135 | #define FRAME_FP(fi) ((fi)->frame) | |
136 | ||
137 | /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most | |
138 | targets. If FRAME_CHAIN_VALID returns zero it means that the given frame | |
139 | is the outermost one and has no caller. | |
140 | ||
141 | If a particular target needs a different definition, then it can override | |
142 | the definition here by providing one in the tm file. | |
143 | ||
144 | XXXX - both default and alternate frame_chain_valid functions are | |
145 | deprecated. New code should use generic dummy frames. */ | |
146 | ||
147 | extern int default_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); | |
148 | extern int alternate_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); | |
149 | extern int nonnull_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); | |
150 | extern int generic_frame_chain_valid PARAMS ((CORE_ADDR, struct frame_info *)); | |
151 | ||
152 | #if !defined (FRAME_CHAIN_VALID) | |
153 | #if !defined (FRAME_CHAIN_VALID_ALTERNATE) | |
154 | #define FRAME_CHAIN_VALID(chain, thisframe) default_frame_chain_valid (chain, thisframe) | |
155 | #else | |
156 | /* Use the alternate method of avoiding running up off the end of the frame | |
157 | chain or following frames back into the startup code. See the comments | |
158 | in objfiles.h. */ | |
159 | #define FRAME_CHAIN_VALID(chain, thisframe) alternate_frame_chain_valid (chain,thisframe) | |
160 | #endif /* FRAME_CHAIN_VALID_ALTERNATE */ | |
161 | #endif /* FRAME_CHAIN_VALID */ | |
162 | ||
163 | /* The stack frame that the user has specified for commands to act on. | |
164 | Note that one cannot assume this is the address of valid data. */ | |
165 | ||
166 | extern struct frame_info *selected_frame; | |
167 | ||
168 | /* Level of the selected frame: | |
169 | 0 for innermost, 1 for its caller, ... | |
170 | or -1 for frame specified by address with no defined level. */ | |
171 | ||
172 | extern int selected_frame_level; | |
173 | ||
174 | extern struct frame_info *get_prev_frame_info PARAMS ((struct frame_info *)); | |
175 | ||
176 | extern struct frame_info *create_new_frame PARAMS ((CORE_ADDR, CORE_ADDR)); | |
177 | ||
178 | extern void flush_cached_frames PARAMS ((void)); | |
179 | ||
180 | extern void reinit_frame_cache PARAMS ((void)); | |
181 | ||
182 | ||
183 | #ifdef FRAME_FIND_SAVED_REGS | |
184 | /* XXX - deprecated */ | |
185 | #define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL) | |
186 | extern void get_frame_saved_regs PARAMS ((struct frame_info *, | |
187 | struct frame_saved_regs *)); | |
188 | #endif | |
189 | ||
190 | extern void set_current_frame PARAMS ((struct frame_info *)); | |
191 | ||
192 | extern struct frame_info *get_prev_frame PARAMS ((struct frame_info *)); | |
193 | ||
194 | extern struct frame_info *get_current_frame PARAMS ((void)); | |
195 | ||
196 | extern struct frame_info *get_next_frame PARAMS ((struct frame_info *)); | |
197 | ||
198 | extern struct block *get_frame_block PARAMS ((struct frame_info *)); | |
199 | ||
200 | extern struct block *get_current_block PARAMS ((void)); | |
201 | ||
202 | extern struct block *get_selected_block PARAMS ((void)); | |
203 | ||
204 | extern struct symbol *get_frame_function PARAMS ((struct frame_info *)); | |
205 | ||
206 | extern CORE_ADDR get_frame_pc PARAMS ((struct frame_info *)); | |
207 | ||
208 | extern CORE_ADDR get_pc_function_start PARAMS ((CORE_ADDR)); | |
209 | ||
210 | extern struct block * block_for_pc PARAMS ((CORE_ADDR)); | |
211 | ||
212 | extern struct block * block_for_pc_sect PARAMS ((CORE_ADDR, asection *)); | |
213 | ||
214 | extern int frameless_look_for_prologue PARAMS ((struct frame_info *)); | |
215 | ||
216 | extern void print_frame_args PARAMS ((struct symbol *, struct frame_info *, | |
217 | int, GDB_FILE *)); | |
218 | ||
219 | extern struct frame_info *find_relative_frame PARAMS ((struct frame_info *, int*)); | |
220 | ||
221 | extern void print_stack_frame PARAMS ((struct frame_info *, int, int)); | |
222 | ||
223 | extern void print_only_stack_frame PARAMS ((struct frame_info *, int, int)); | |
224 | ||
225 | extern void show_stack_frame PARAMS ((struct frame_info *)); | |
226 | ||
227 | extern void select_frame PARAMS ((struct frame_info *, int)); | |
228 | ||
229 | extern void record_selected_frame PARAMS ((CORE_ADDR *, int *)); | |
230 | ||
231 | extern void select_and_print_frame PARAMS ((struct frame_info *, int)); | |
232 | ||
233 | extern void print_frame_info PARAMS ((struct frame_info *, int, int, int)); | |
234 | ||
235 | extern void show_frame_info PARAMS ((struct frame_info *, int, int, int)); | |
236 | ||
237 | extern CORE_ADDR find_saved_register PARAMS ((struct frame_info *, int)); | |
238 | ||
239 | extern struct frame_info *block_innermost_frame PARAMS ((struct block *)); | |
240 | ||
241 | extern struct frame_info *find_frame_addr_in_frame_chain PARAMS ((CORE_ADDR)); | |
242 | ||
243 | extern CORE_ADDR sigtramp_saved_pc PARAMS ((struct frame_info *)); | |
244 | ||
245 | extern CORE_ADDR generic_read_register_dummy PARAMS ((CORE_ADDR pc, | |
246 | CORE_ADDR fp, | |
247 | int)); | |
248 | extern void generic_push_dummy_frame PARAMS ((void)); | |
249 | extern void generic_pop_current_frame PARAMS ((void (*) (struct frame_info *))); | |
250 | extern void generic_pop_dummy_frame PARAMS ((void)); | |
251 | ||
252 | extern int generic_pc_in_call_dummy PARAMS ((CORE_ADDR pc, | |
253 | CORE_ADDR fp)); | |
254 | extern char * generic_find_dummy_frame PARAMS ((CORE_ADDR pc, | |
255 | CORE_ADDR fp)); | |
256 | ||
257 | #ifdef __GNUC__ | |
258 | /* Some native compilers, even ones that are supposed to be ANSI and for which __STDC__ | |
259 | is true, complain about forward decls of enums. */ | |
260 | enum lval_type; | |
261 | extern void generic_get_saved_register PARAMS ((char *, int *, CORE_ADDR *, struct frame_info *, int, enum lval_type *)); | |
262 | #endif | |
263 | ||
264 | #endif /* !defined (FRAME_H) */ |