1 /* Definitions for dealing with stack frames, for GDB, the GNU debugger.
3 Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1996,
4 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 #if !defined (FRAME_H)
26 /* Describe the saved registers of a frame. */
28 #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
29 /* XXXX - deprecated */
30 struct frame_saved_regs
32 /* For each register R (except the SP), regs[R] is the address at
33 which it was saved on entry to the frame, or zero if it was not
34 saved on entry to this frame. This includes special registers
35 such as pc and fp saved in special ways in the stack frame.
37 regs[SP_REGNUM] is different. It holds the actual SP, not the
38 address at which it was saved. */
40 CORE_ADDR regs
[NUM_REGS
];
44 /* We keep a cache of stack frames, each of which is a "struct
45 frame_info". The innermost one gets allocated (in
46 wait_for_inferior) each time the inferior stops; current_frame
47 points to it. Additional frames get allocated (in
48 get_prev_frame) as needed, and are chained through the next
49 and prev fields. Any time that the frame cache becomes invalid
50 (most notably when we execute something, but also if we change how
51 we interpret the frames (e.g. "set heuristic-fence-post" in
52 mips-tdep.c, or anything which reads new symbols)), we should call
53 reinit_frame_cache. */
57 /* Nominal address of the frame described. See comments at FRAME_FP
58 about what this means outside the *FRAME* macros; in the *FRAME*
59 macros, it can mean whatever makes most sense for this machine. */
62 /* Address at which execution is occurring in this frame.
63 For the innermost frame, it's the current pc.
64 For other frames, it is a pc saved in the next frame. */
67 /* Level of this frame. The inner-most (youngest) frame is at
68 level 0. As you move towards the outer-most (oldest) frame,
69 the level increases. This is a cached value. It could just as
70 easily be computed by counting back from the selected frame to
71 the inner most frame. */
72 /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
73 reserved to indicate a bogus frame - one that has been created
74 just to keep GDB happy (GDB always needs a frame). For the
75 moment leave this as speculation. */
78 /* Nonzero if this is a frame associated with calling a signal handler.
80 Set by machine-dependent code. On some machines, if
81 the machine-dependent code fails to check for this, the backtrace
82 will look relatively normal. For example, on the i386
83 #3 0x158728 in sighold ()
84 On other machines (e.g. rs6000), the machine-dependent code better
85 set this to prevent us from trying to print it like a normal frame. */
86 int signal_handler_caller
;
88 /* For each register, address of where it was saved on entry to
89 the frame, or zero if it was not saved on entry to this frame.
90 This includes special registers such as pc and fp saved in
91 special ways in the stack frame. The SP_REGNUM is even more
92 special, the address here is the sp for the previous frame, not
93 the address where the sp was saved. */
94 /* Allocated by frame_saved_regs_zalloc () which is called /
95 initialized by FRAME_INIT_SAVED_REGS(). */
96 CORE_ADDR
*saved_regs
; /*NUM_REGS + NUM_PSEUDO_REGS*/
98 #ifdef EXTRA_FRAME_INFO
99 /* XXXX - deprecated */
100 /* Anything extra for this structure that may have been defined
101 in the machine dependent files. */
105 /* Anything extra for this structure that may have been defined
106 in the machine dependent files. */
107 /* Allocated by frame_obstack_alloc () which is called /
108 initialized by INIT_EXTRA_FRAME_INFO */
109 struct frame_extra_info
*extra_info
;
111 /* If dwarf2 unwind frame informations is used, this structure holds all
112 related unwind data. */
113 struct unwind_contect
*context
;
115 /* Pointers to the next (down, inner) and previous (up, outer)
116 frame_info's in the frame cache. */
117 struct frame_info
*next
; /* down, inner */
118 struct frame_info
*prev
; /* up, outer */
121 /* Values for the source flag to be used in print_frame_info_base(). */
124 /* Print only the source line, like in stepi. */
126 /* Print only the location, i.e. level, address (sometimes)
127 function, args, file, line, line num. */
129 /* Print both of the above. */
131 /* Print location only, but always include the address. */
135 /* Allocate additional space for appendices to a struct frame_info.
136 NOTE: Much of GDB's code works on the assumption that the allocated
137 saved_regs[] array is the size specified below. If you try to make
138 that array smaller, GDB will happily walk off its end. */
140 #ifdef SIZEOF_FRAME_SAVED_REGS
141 #error "SIZEOF_FRAME_SAVED_REGS can not be re-defined"
143 #define SIZEOF_FRAME_SAVED_REGS \
144 (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
146 extern void *frame_obstack_alloc (unsigned long size
);
147 extern void frame_saved_regs_zalloc (struct frame_info
*);
149 /* Return the frame address from FI. Except in the machine-dependent
150 *FRAME* macros, a frame address has no defined meaning other than
151 as a magic cookie which identifies a frame over calls to the
152 inferior. The only known exception is inferior.h
153 (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
154 assume that a frame address contains enough information to
155 reconstruct the frame; if you want more than just to identify the
156 frame (e.g. be able to fetch variables relative to that frame),
157 then save the whole struct frame_info (and the next struct
158 frame_info, since the latter is used for fetching variables on some
161 #define FRAME_FP(fi) ((fi)->frame)
163 /* Level of the frame: 0 for innermost, 1 for its caller, ...; or -1
164 for an invalid frame. */
166 extern int frame_relative_level (struct frame_info
*fi
);
168 /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
169 targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
170 is the outermost one and has no caller.
172 XXXX - both default and alternate frame_chain_valid functions are
173 deprecated. New code should use dummy frames and one of the
174 generic functions. */
176 extern int file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
177 extern int func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
178 extern int nonnull_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
179 extern int generic_file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
180 extern int generic_func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
181 extern void generic_save_dummy_frame_tos (CORE_ADDR sp
);
183 /* The stack frame that the user has specified for commands to act on.
184 Note that one cannot assume this is the address of valid data. */
186 extern struct frame_info
*selected_frame
;
188 /* Level of the selected frame:
189 0 for innermost, 1 for its caller, ...
190 or -1 for frame specified by address with no defined level. */
192 extern struct frame_info
*create_new_frame (CORE_ADDR
, CORE_ADDR
);
194 extern void flush_cached_frames (void);
196 extern void reinit_frame_cache (void);
199 #ifdef FRAME_FIND_SAVED_REGS
200 /* XXX - deprecated */
201 #define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
202 extern void get_frame_saved_regs (struct frame_info
*,
203 struct frame_saved_regs
*);
206 extern void set_current_frame (struct frame_info
*);
208 extern struct frame_info
*get_prev_frame (struct frame_info
*);
210 extern struct frame_info
*get_current_frame (void);
212 extern struct frame_info
*get_next_frame (struct frame_info
*);
214 extern struct block
*get_frame_block (struct frame_info
*,
215 CORE_ADDR
*addr_in_block
);
217 extern struct block
*get_current_block (CORE_ADDR
*addr_in_block
);
219 extern struct block
*get_selected_block (CORE_ADDR
*addr_in_block
);
221 extern struct symbol
*get_frame_function (struct frame_info
*);
223 extern CORE_ADDR
get_frame_pc (struct frame_info
*);
225 extern CORE_ADDR
get_pc_function_start (CORE_ADDR
);
227 extern struct block
*block_for_pc (CORE_ADDR
);
229 extern struct block
*block_for_pc_sect (CORE_ADDR
, asection
*);
231 extern int frameless_look_for_prologue (struct frame_info
*);
233 extern void print_frame_args (struct symbol
*, struct frame_info
*,
234 int, struct ui_file
*);
236 extern struct frame_info
*find_relative_frame (struct frame_info
*, int *);
238 extern void show_and_print_stack_frame (struct frame_info
*fi
, int level
,
241 extern void print_stack_frame (struct frame_info
*, int, int);
243 extern void print_only_stack_frame (struct frame_info
*, int, int);
245 extern void show_stack_frame (struct frame_info
*);
247 extern void select_frame (struct frame_info
*, int);
249 extern void record_selected_frame (CORE_ADDR
*, int *);
251 extern void select_and_print_frame (struct frame_info
*, int);
253 extern void print_frame_info (struct frame_info
*, int, int, int);
255 extern void show_frame_info (struct frame_info
*, int, int, int);
257 extern CORE_ADDR
find_saved_register (struct frame_info
*, int);
259 extern struct frame_info
*block_innermost_frame (struct block
*);
261 extern struct frame_info
*find_frame_addr_in_frame_chain (CORE_ADDR
);
263 extern CORE_ADDR
sigtramp_saved_pc (struct frame_info
*);
265 extern CORE_ADDR
generic_read_register_dummy (CORE_ADDR pc
,
267 extern void generic_push_dummy_frame (void);
268 extern void generic_pop_current_frame (void (*)(struct frame_info
*));
269 extern void generic_pop_dummy_frame (void);
271 extern int generic_pc_in_call_dummy (CORE_ADDR pc
,
272 CORE_ADDR sp
, CORE_ADDR fp
);
273 extern char *generic_find_dummy_frame (CORE_ADDR pc
, CORE_ADDR fp
);
275 extern void generic_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
276 int nargs
, struct value
**args
,
277 struct type
*type
, int gcc_p
);
279 extern void generic_get_saved_register (char *, int *, CORE_ADDR
*,
280 struct frame_info
*, int,
283 extern void generic_save_call_dummy_addr (CORE_ADDR lo
, CORE_ADDR hi
);
285 extern void get_saved_register (char *raw_buffer
, int *optimized
,
287 struct frame_info
*frame
,
288 int regnum
, enum lval_type
*lval
);
290 /* Return the register as found on the FRAME. Return zero if the
291 register could not be found. */
292 extern int frame_register_read (struct frame_info
*frame
, int regnum
,
295 #endif /* !defined (FRAME_H) */
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