1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996, 1997,
3 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 #if !defined (FRAME_H)
25 /* Describe the saved registers of a frame. */
27 #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
28 /* XXXX - deprecated */
29 struct frame_saved_regs
31 /* For each register R (except the SP), regs[R] is the address at
32 which it was saved on entry to the frame, or zero if it was not
33 saved on entry to this frame. This includes special registers
34 such as pc and fp saved in special ways in the stack frame.
36 regs[SP_REGNUM] is different. It holds the actual SP, not the
37 address at which it was saved. */
39 CORE_ADDR regs
[NUM_REGS
];
43 /* We keep a cache of stack frames, each of which is a "struct
44 frame_info". The innermost one gets allocated (in
45 wait_for_inferior) each time the inferior stops; current_frame
46 points to it. Additional frames get allocated (in
47 get_prev_frame) as needed, and are chained through the next
48 and prev fields. Any time that the frame cache becomes invalid
49 (most notably when we execute something, but also if we change how
50 we interpret the frames (e.g. "set heuristic-fence-post" in
51 mips-tdep.c, or anything which reads new symbols)), we should call
52 reinit_frame_cache. */
56 /* Nominal address of the frame described. See comments at FRAME_FP
57 about what this means outside the *FRAME* macros; in the *FRAME*
58 macros, it can mean whatever makes most sense for this machine. */
61 /* Address at which execution is occurring in this frame.
62 For the innermost frame, it's the current pc.
63 For other frames, it is a pc saved in the next frame. */
66 /* Nonzero if this is a frame associated with calling a signal handler.
68 Set by machine-dependent code. On some machines, if
69 the machine-dependent code fails to check for this, the backtrace
70 will look relatively normal. For example, on the i386
71 #3 0x158728 in sighold ()
72 On other machines (e.g. rs6000), the machine-dependent code better
73 set this to prevent us from trying to print it like a normal frame. */
74 int signal_handler_caller
;
76 /* For each register, address of where it was saved on entry to
77 the frame, or zero if it was not saved on entry to this frame.
78 This includes special registers such as pc and fp saved in
79 special ways in the stack frame. The SP_REGNUM is even more
80 special, the address here is the sp for the previous frame, not
81 the address where the sp was saved. */
82 /* Allocated by frame_saved_regs_zalloc () which is called /
83 initialized by FRAME_INIT_SAVED_REGS(). */
84 CORE_ADDR
*saved_regs
; /*NUM_REGS + NUM_PSEUDO_REGS*/
86 #ifdef EXTRA_FRAME_INFO
87 /* XXXX - deprecated */
88 /* Anything extra for this structure that may have been defined
89 in the machine dependent files. */
93 /* Anything extra for this structure that may have been defined
94 in the machine dependent files. */
95 /* Allocated by frame_obstack_alloc () which is called /
96 initialized by INIT_EXTRA_FRAME_INFO */
97 struct frame_extra_info
*extra_info
;
99 /* If dwarf2 unwind frame informations is used, this structure holds all
100 related unwind data. */
101 struct unwind_contect
*context
;
103 /* Pointers to the next (down, inner) and previous (up, outer)
104 frame_info's in the frame cache. */
105 struct frame_info
*next
; /* down, inner */
106 struct frame_info
*prev
; /* up, outer */
109 /* Values for the source flag to be used in print_frame_info_base(). */
112 /* Print only the source line, like in stepi. */
114 /* Print only the location, i.e. level, address (sometimes)
115 function, args, file, line, line num. */
117 /* Print both of the above. */
119 /* Print location only, but always include the address. */
123 /* Allocate additional space for appendices to a struct frame_info.
124 NOTE: Much of GDB's code works on the assumption that the allocated
125 saved_regs[] array is the size specified below. If you try to make
126 that array smaller, GDB will happily walk off its end. */
128 #ifdef SIZEOF_FRAME_SAVED_REGS
129 #error "SIZEOF_FRAME_SAVED_REGS can not be re-defined"
131 #define SIZEOF_FRAME_SAVED_REGS \
132 (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
134 extern void *frame_obstack_alloc (unsigned long size
);
135 extern void frame_saved_regs_zalloc (struct frame_info
*);
137 /* Return the frame address from FI. Except in the machine-dependent
138 *FRAME* macros, a frame address has no defined meaning other than
139 as a magic cookie which identifies a frame over calls to the
140 inferior. The only known exception is inferior.h
141 (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
142 assume that a frame address contains enough information to
143 reconstruct the frame; if you want more than just to identify the
144 frame (e.g. be able to fetch variables relative to that frame),
145 then save the whole struct frame_info (and the next struct
146 frame_info, since the latter is used for fetching variables on some
149 #define FRAME_FP(fi) ((fi)->frame)
151 /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
152 targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
153 is the outermost one and has no caller.
155 XXXX - both default and alternate frame_chain_valid functions are
156 deprecated. New code should use dummy frames and one of the
157 generic functions. */
159 extern int file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
160 extern int func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
161 extern int nonnull_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
162 extern int generic_file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
163 extern int generic_func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
164 extern void generic_save_dummy_frame_tos (CORE_ADDR sp
);
166 /* The stack frame that the user has specified for commands to act on.
167 Note that one cannot assume this is the address of valid data. */
169 extern struct frame_info
*selected_frame
;
171 /* Level of the selected frame:
172 0 for innermost, 1 for its caller, ...
173 or -1 for frame specified by address with no defined level. */
175 extern int selected_frame_level
;
177 extern struct frame_info
*create_new_frame (CORE_ADDR
, CORE_ADDR
);
179 extern void flush_cached_frames (void);
181 extern void reinit_frame_cache (void);
184 #ifdef FRAME_FIND_SAVED_REGS
185 /* XXX - deprecated */
186 #define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
187 extern void get_frame_saved_regs (struct frame_info
*,
188 struct frame_saved_regs
*);
191 extern void set_current_frame (struct frame_info
*);
193 extern struct frame_info
*get_prev_frame (struct frame_info
*);
195 extern struct frame_info
*get_current_frame (void);
197 extern struct frame_info
*get_next_frame (struct frame_info
*);
199 extern struct block
*get_frame_block (struct frame_info
*);
201 extern struct block
*get_current_block (void);
203 extern struct block
*get_selected_block (void);
205 extern struct symbol
*get_frame_function (struct frame_info
*);
207 extern CORE_ADDR
get_frame_pc (struct frame_info
*);
209 extern CORE_ADDR
get_pc_function_start (CORE_ADDR
);
211 extern struct block
*block_for_pc (CORE_ADDR
);
213 extern struct block
*block_for_pc_sect (CORE_ADDR
, asection
*);
215 extern int frameless_look_for_prologue (struct frame_info
*);
217 extern void print_frame_args (struct symbol
*, struct frame_info
*,
218 int, struct ui_file
*);
220 extern struct frame_info
*find_relative_frame (struct frame_info
*, int *);
222 extern void show_and_print_stack_frame (struct frame_info
*fi
, int level
,
225 extern void print_stack_frame (struct frame_info
*, int, int);
227 extern void print_only_stack_frame (struct frame_info
*, int, int);
229 extern void show_stack_frame (struct frame_info
*);
231 extern void select_frame (struct frame_info
*, int);
233 extern void record_selected_frame (CORE_ADDR
*, int *);
235 extern void select_and_print_frame (struct frame_info
*, int);
237 extern void print_frame_info (struct frame_info
*, int, int, int);
239 extern void show_frame_info (struct frame_info
*, int, int, int);
241 extern CORE_ADDR
find_saved_register (struct frame_info
*, int);
243 extern struct frame_info
*block_innermost_frame (struct block
*);
245 extern struct frame_info
*find_frame_addr_in_frame_chain (CORE_ADDR
);
247 extern CORE_ADDR
sigtramp_saved_pc (struct frame_info
*);
249 extern CORE_ADDR
generic_read_register_dummy (CORE_ADDR pc
,
251 extern void generic_push_dummy_frame (void);
252 extern void generic_pop_current_frame (void (*)(struct frame_info
*));
253 extern void generic_pop_dummy_frame (void);
255 extern int generic_pc_in_call_dummy (CORE_ADDR pc
,
256 CORE_ADDR sp
, CORE_ADDR fp
);
257 extern char *generic_find_dummy_frame (CORE_ADDR pc
, CORE_ADDR fp
);
259 extern void generic_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
260 int nargs
, struct value
**args
,
261 struct type
*type
, int gcc_p
);
263 extern void generic_get_saved_register (char *, int *, CORE_ADDR
*,
264 struct frame_info
*, int,
267 extern void get_saved_register (char *raw_buffer
, int *optimized
,
269 struct frame_info
*frame
,
270 int regnum
, enum lval_type
*lval
);
272 #endif /* !defined (FRAME_H) */
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