1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
2 Copyright 1986, 1989, 1991, 1992, 1999, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
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.
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.
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,
19 Boston, MA 02111-1307, USA. */
21 #if !defined (FRAME_H)
24 /* Describe the saved registers of a frame. */
26 #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
27 /* XXXX - deprecated */
28 struct frame_saved_regs
30 /* For each register R (except the SP), regs[R] is the address at
31 which it was saved on entry to the frame, or zero if it was not
32 saved on entry to this frame. This includes special registers
33 such as pc and fp saved in special ways in the stack frame.
35 regs[SP_REGNUM] is different. It holds the actual SP, not the
36 address at which it was saved. */
38 CORE_ADDR regs
[NUM_REGS
];
42 /* We keep a cache of stack frames, each of which is a "struct
43 frame_info". The innermost one gets allocated (in
44 wait_for_inferior) each time the inferior stops; current_frame
45 points to it. Additional frames get allocated (in
46 get_prev_frame) as needed, and are chained through the next
47 and prev fields. Any time that the frame cache becomes invalid
48 (most notably when we execute something, but also if we change how
49 we interpret the frames (e.g. "set heuristic-fence-post" in
50 mips-tdep.c, or anything which reads new symbols)), we should call
51 reinit_frame_cache. */
55 /* Nominal address of the frame described. See comments at FRAME_FP
56 about what this means outside the *FRAME* macros; in the *FRAME*
57 macros, it can mean whatever makes most sense for this machine. */
60 /* Address at which execution is occurring in this frame.
61 For the innermost frame, it's the current pc.
62 For other frames, it is a pc saved in the next frame. */
65 /* Nonzero if this is a frame associated with calling a signal handler.
67 Set by machine-dependent code. On some machines, if
68 the machine-dependent code fails to check for this, the backtrace
69 will look relatively normal. For example, on the i386
70 #3 0x158728 in sighold ()
71 On other machines (e.g. rs6000), the machine-dependent code better
72 set this to prevent us from trying to print it like a normal frame. */
73 int signal_handler_caller
;
75 /* For each register, address of where it was saved on entry to
76 the frame, or zero if it was not saved on entry to this frame.
77 This includes special registers such as pc and fp saved in
78 special ways in the stack frame. The SP_REGNUM is even more
79 special, the address here is the sp for the next frame, not the
80 address where the sp was saved. */
81 /* Allocated by frame_saved_regs_zalloc () which is called /
82 initialized by FRAME_INIT_SAVED_REGS(). */
83 CORE_ADDR
*saved_regs
; /*NUM_REGS */
85 #ifdef EXTRA_FRAME_INFO
86 /* XXXX - deprecated */
87 /* Anything extra for this structure that may have been defined
88 in the machine dependent files. */
92 /* Anything extra for this structure that may have been defined
93 in the machine dependent files. */
94 /* Allocated by frame_obstack_alloc () which is called /
95 initialized by INIT_EXTRA_FRAME_INFO */
96 struct frame_extra_info
*extra_info
;
98 /* Pointers to the next and previous frame_info's in the frame cache. */
99 struct frame_info
*next
, *prev
;
102 /* Values for the source flag to be used in print_frame_info_base(). */
105 /* Print only the source line, like in stepi. */
107 /* Print only the location, i.e. level, address (sometimes)
108 function, args, file, line, line num. */
110 /* Print both of the above. */
112 /* Print location only, but always include the address. */
116 /* Allocate additional space for appendices to a struct frame_info. */
118 #ifndef SIZEOF_FRAME_SAVED_REGS
119 #define SIZEOF_FRAME_SAVED_REGS (sizeof (CORE_ADDR) * (NUM_REGS))
121 extern void *frame_obstack_alloc (unsigned long size
);
122 extern void frame_saved_regs_zalloc (struct frame_info
*);
124 /* Return the frame address from FR. Except in the machine-dependent
125 *FRAME* macros, a frame address has no defined meaning other than
126 as a magic cookie which identifies a frame over calls to the
127 inferior. The only known exception is inferior.h
128 (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
129 assume that a frame address contains enough information to
130 reconstruct the frame; if you want more than just to identify the
131 frame (e.g. be able to fetch variables relative to that frame),
132 then save the whole struct frame_info (and the next struct
133 frame_info, since the latter is used for fetching variables on some
136 #define FRAME_FP(fi) ((fi)->frame)
138 /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
139 targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
140 is the outermost one and has no caller.
142 If a particular target needs a different definition, then it can override
143 the definition here by providing one in the tm file.
145 XXXX - both default and alternate frame_chain_valid functions are
146 deprecated. New code should use dummy frames and one of the
147 generic functions. */
149 extern int file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
150 extern int func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
151 extern int nonnull_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
152 extern int generic_file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
153 extern int generic_func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
154 extern void generic_save_dummy_frame_tos (CORE_ADDR sp
);
156 #if !defined (FRAME_CHAIN_VALID)
157 #if !defined (FRAME_CHAIN_VALID_ALTERNATE)
158 #define FRAME_CHAIN_VALID(chain, thisframe) file_frame_chain_valid (chain, thisframe)
160 /* Use the alternate method of avoiding running up off the end of the frame
161 chain or following frames back into the startup code. See the comments
163 #define FRAME_CHAIN_VALID(chain, thisframe) func_frame_chain_valid (chain,thisframe)
164 #endif /* FRAME_CHAIN_VALID_ALTERNATE */
165 #endif /* FRAME_CHAIN_VALID */
167 /* The stack frame that the user has specified for commands to act on.
168 Note that one cannot assume this is the address of valid data. */
170 extern struct frame_info
*selected_frame
;
172 /* Level of the selected frame:
173 0 for innermost, 1 for its caller, ...
174 or -1 for frame specified by address with no defined level. */
176 extern int selected_frame_level
;
178 extern struct frame_info
*create_new_frame (CORE_ADDR
, CORE_ADDR
);
180 extern void flush_cached_frames (void);
182 extern void reinit_frame_cache (void);
185 #ifdef FRAME_FIND_SAVED_REGS
186 /* XXX - deprecated */
187 #define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
188 extern void get_frame_saved_regs (struct frame_info
*,
189 struct frame_saved_regs
*);
192 extern void set_current_frame (struct frame_info
*);
194 extern struct frame_info
*get_prev_frame (struct frame_info
*);
196 extern struct frame_info
*get_current_frame (void);
198 extern struct frame_info
*get_next_frame (struct frame_info
*);
200 extern struct block
*get_frame_block (struct frame_info
*);
202 extern struct block
*get_current_block (void);
204 extern struct block
*get_selected_block (void);
206 extern struct symbol
*get_frame_function (struct frame_info
*);
208 extern CORE_ADDR
get_frame_pc (struct frame_info
*);
210 extern CORE_ADDR
get_pc_function_start (CORE_ADDR
);
212 extern struct block
*block_for_pc (CORE_ADDR
);
214 extern struct block
*block_for_pc_sect (CORE_ADDR
, asection
*);
216 extern int frameless_look_for_prologue (struct frame_info
*);
218 extern void print_frame_args (struct symbol
*, struct frame_info
*,
219 int, struct ui_file
*);
221 extern struct frame_info
*find_relative_frame (struct frame_info
*, int *);
223 extern void show_and_print_stack_frame (struct frame_info
*fi
, int level
,
226 extern void print_stack_frame (struct frame_info
*, int, int);
228 extern void print_only_stack_frame (struct frame_info
*, int, int);
230 extern void show_stack_frame (struct frame_info
*);
232 extern void select_frame (struct frame_info
*, int);
234 extern void record_selected_frame (CORE_ADDR
*, int *);
236 extern void select_and_print_frame (struct frame_info
*, int);
238 extern void print_frame_info (struct frame_info
*, int, int, int);
240 extern void show_frame_info (struct frame_info
*, int, int, int);
242 extern CORE_ADDR
find_saved_register (struct frame_info
*, int);
244 extern struct frame_info
*block_innermost_frame (struct block
*);
246 extern struct frame_info
*find_frame_addr_in_frame_chain (CORE_ADDR
);
248 extern CORE_ADDR
sigtramp_saved_pc (struct frame_info
*);
250 extern CORE_ADDR
generic_read_register_dummy (CORE_ADDR pc
,
252 extern void generic_push_dummy_frame (void);
253 extern void generic_pop_current_frame (void (*)(struct frame_info
*));
254 extern void generic_pop_dummy_frame (void);
256 extern int generic_pc_in_call_dummy (CORE_ADDR pc
,
257 CORE_ADDR sp
, CORE_ADDR fp
);
258 extern char *generic_find_dummy_frame (CORE_ADDR pc
, CORE_ADDR fp
);
260 extern void generic_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
261 int nargs
, struct value
**args
,
262 struct type
*type
, int gcc_p
);
264 extern void generic_get_saved_register (char *, int *, CORE_ADDR
*,
265 struct frame_info
*, int,
268 #endif /* !defined (FRAME_H) */
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