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 /* Return the location (and possibly value) of REGNUM for the previous
27 (older, up) frame. All parameters except VALUEP can be assumed to
28 be non NULL. When VALUEP is NULL, just the location of the
29 register should be returned.
31 UNWIND_CACHE is provided as mechanism for implementing a per-frame
32 local cache. It's initial value being NULL. Memory for that cache
33 should be allocated using frame_obstack_alloc().
35 Register window architectures (eg SPARC) should note that REGNUM
36 identifies the register for the previous frame. For instance, a
37 request for the value of "o1" for the previous frame would be found
38 in the register "i1" in this FRAME. */
40 typedef void (frame_register_unwind_ftype
) (struct frame_info
*frame
,
44 enum lval_type
*lvalp
,
49 /* Describe the saved registers of a frame. */
51 #if defined (EXTRA_FRAME_INFO) || defined (FRAME_FIND_SAVED_REGS)
52 /* XXXX - deprecated */
53 struct frame_saved_regs
55 /* For each register R (except the SP), regs[R] is the address at
56 which it was saved on entry to the frame, or zero if it was not
57 saved on entry to this frame. This includes special registers
58 such as pc and fp saved in special ways in the stack frame.
60 regs[SP_REGNUM] is different. It holds the actual SP, not the
61 address at which it was saved. */
63 CORE_ADDR regs
[NUM_REGS
];
67 /* We keep a cache of stack frames, each of which is a "struct
68 frame_info". The innermost one gets allocated (in
69 wait_for_inferior) each time the inferior stops; current_frame
70 points to it. Additional frames get allocated (in
71 get_prev_frame) as needed, and are chained through the next
72 and prev fields. Any time that the frame cache becomes invalid
73 (most notably when we execute something, but also if we change how
74 we interpret the frames (e.g. "set heuristic-fence-post" in
75 mips-tdep.c, or anything which reads new symbols)), we should call
76 reinit_frame_cache. */
80 /* Nominal address of the frame described. See comments at FRAME_FP
81 about what this means outside the *FRAME* macros; in the *FRAME*
82 macros, it can mean whatever makes most sense for this machine. */
85 /* Address at which execution is occurring in this frame.
86 For the innermost frame, it's the current pc.
87 For other frames, it is a pc saved in the next frame. */
90 /* Level of this frame. The inner-most (youngest) frame is at
91 level 0. As you move towards the outer-most (oldest) frame,
92 the level increases. This is a cached value. It could just as
93 easily be computed by counting back from the selected frame to
94 the inner most frame. */
95 /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
96 reserved to indicate a bogus frame - one that has been created
97 just to keep GDB happy (GDB always needs a frame). For the
98 moment leave this as speculation. */
101 /* Nonzero if this is a frame associated with calling a signal handler.
103 Set by machine-dependent code. On some machines, if
104 the machine-dependent code fails to check for this, the backtrace
105 will look relatively normal. For example, on the i386
106 #3 0x158728 in sighold ()
107 On other machines (e.g. rs6000), the machine-dependent code better
108 set this to prevent us from trying to print it like a normal frame. */
109 int signal_handler_caller
;
111 /* For each register, address of where it was saved on entry to
112 the frame, or zero if it was not saved on entry to this frame.
113 This includes special registers such as pc and fp saved in
114 special ways in the stack frame. The SP_REGNUM is even more
115 special, the address here is the sp for the previous frame, not
116 the address where the sp was saved. */
117 /* Allocated by frame_saved_regs_zalloc () which is called /
118 initialized by FRAME_INIT_SAVED_REGS(). */
119 CORE_ADDR
*saved_regs
; /*NUM_REGS + NUM_PSEUDO_REGS*/
121 #ifdef EXTRA_FRAME_INFO
122 /* XXXX - deprecated */
123 /* Anything extra for this structure that may have been defined
124 in the machine dependent files. */
128 /* Anything extra for this structure that may have been defined
129 in the machine dependent files. */
130 /* Allocated by frame_obstack_alloc () which is called /
131 initialized by INIT_EXTRA_FRAME_INFO */
132 struct frame_extra_info
*extra_info
;
134 /* If dwarf2 unwind frame informations is used, this structure holds all
135 related unwind data. */
136 struct unwind_contect
*context
;
138 /* See description above. Return the register value for the
140 frame_register_unwind_ftype
*register_unwind
;
141 void *register_unwind_cache
;
143 /* Pointers to the next (down, inner) and previous (up, outer)
144 frame_info's in the frame cache. */
145 struct frame_info
*next
; /* down, inner */
146 struct frame_info
*prev
; /* up, outer */
149 /* Values for the source flag to be used in print_frame_info_base(). */
152 /* Print only the source line, like in stepi. */
154 /* Print only the location, i.e. level, address (sometimes)
155 function, args, file, line, line num. */
157 /* Print both of the above. */
159 /* Print location only, but always include the address. */
163 /* Allocate additional space for appendices to a struct frame_info.
164 NOTE: Much of GDB's code works on the assumption that the allocated
165 saved_regs[] array is the size specified below. If you try to make
166 that array smaller, GDB will happily walk off its end. */
168 #ifdef SIZEOF_FRAME_SAVED_REGS
169 #error "SIZEOF_FRAME_SAVED_REGS can not be re-defined"
171 #define SIZEOF_FRAME_SAVED_REGS \
172 (sizeof (CORE_ADDR) * (NUM_REGS+NUM_PSEUDO_REGS))
174 extern void *frame_obstack_alloc (unsigned long size
);
175 extern void frame_saved_regs_zalloc (struct frame_info
*);
177 /* Return the frame address from FI. Except in the machine-dependent
178 *FRAME* macros, a frame address has no defined meaning other than
179 as a magic cookie which identifies a frame over calls to the
180 inferior. The only known exception is inferior.h
181 (PC_IN_CALL_DUMMY) [ON_STACK]; see comments there. You cannot
182 assume that a frame address contains enough information to
183 reconstruct the frame; if you want more than just to identify the
184 frame (e.g. be able to fetch variables relative to that frame),
185 then save the whole struct frame_info (and the next struct
186 frame_info, since the latter is used for fetching variables on some
189 #define FRAME_FP(fi) ((fi)->frame)
191 /* Level of the frame: 0 for innermost, 1 for its caller, ...; or -1
192 for an invalid frame. */
194 extern int frame_relative_level (struct frame_info
*fi
);
196 /* Define a default FRAME_CHAIN_VALID, in the form that is suitable for most
197 targets. If FRAME_CHAIN_VALID returns zero it means that the given frame
198 is the outermost one and has no caller.
200 XXXX - both default and alternate frame_chain_valid functions are
201 deprecated. New code should use dummy frames and one of the
202 generic functions. */
204 extern int file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
205 extern int func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
206 extern int nonnull_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
207 extern int generic_file_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
208 extern int generic_func_frame_chain_valid (CORE_ADDR
, struct frame_info
*);
209 extern void generic_save_dummy_frame_tos (CORE_ADDR sp
);
211 /* The stack frame that the user has specified for commands to act on.
212 Note that one cannot assume this is the address of valid data. */
214 extern struct frame_info
*selected_frame
;
216 /* Level of the selected frame:
217 0 for innermost, 1 for its caller, ...
218 or -1 for frame specified by address with no defined level. */
220 extern struct frame_info
*create_new_frame (CORE_ADDR
, CORE_ADDR
);
222 extern void flush_cached_frames (void);
224 extern void reinit_frame_cache (void);
227 #ifdef FRAME_FIND_SAVED_REGS
228 /* XXX - deprecated */
229 #define FRAME_INIT_SAVED_REGS(FI) get_frame_saved_regs (FI, NULL)
230 extern void get_frame_saved_regs (struct frame_info
*,
231 struct frame_saved_regs
*);
234 extern void set_current_frame (struct frame_info
*);
236 extern struct frame_info
*get_prev_frame (struct frame_info
*);
238 extern struct frame_info
*get_current_frame (void);
240 extern struct frame_info
*get_next_frame (struct frame_info
*);
242 extern struct block
*get_frame_block (struct frame_info
*,
243 CORE_ADDR
*addr_in_block
);
245 extern struct block
*get_current_block (CORE_ADDR
*addr_in_block
);
247 extern struct block
*get_selected_block (CORE_ADDR
*addr_in_block
);
249 extern struct symbol
*get_frame_function (struct frame_info
*);
251 extern CORE_ADDR
get_frame_pc (struct frame_info
*);
253 extern CORE_ADDR
get_pc_function_start (CORE_ADDR
);
255 extern struct block
*block_for_pc (CORE_ADDR
);
257 extern struct block
*block_for_pc_sect (CORE_ADDR
, asection
*);
259 extern int frameless_look_for_prologue (struct frame_info
*);
261 extern void print_frame_args (struct symbol
*, struct frame_info
*,
262 int, struct ui_file
*);
264 extern struct frame_info
*find_relative_frame (struct frame_info
*, int *);
266 extern void show_and_print_stack_frame (struct frame_info
*fi
, int level
,
269 extern void print_stack_frame (struct frame_info
*, int, int);
271 extern void print_only_stack_frame (struct frame_info
*, int, int);
273 extern void show_stack_frame (struct frame_info
*);
275 extern void select_frame (struct frame_info
*);
277 /* Return an ID that can be used to re-find a frame. */
281 /* The frame's address. This should be constant through out the
282 lifetime of a frame. */
284 /* The frame's current PC. While this changes, the function that
285 the PC falls into, does not. */
289 extern void get_frame_id (struct frame_info
*fi
, struct frame_id
*id
);
291 extern struct frame_info
*frame_find_by_id (struct frame_id id
);
293 extern void print_frame_info (struct frame_info
*, int, int, int);
295 extern void show_frame_info (struct frame_info
*, int, int, int);
297 extern CORE_ADDR
find_saved_register (struct frame_info
*, int);
299 extern struct frame_info
*block_innermost_frame (struct block
*);
301 extern struct frame_info
*find_frame_addr_in_frame_chain (CORE_ADDR
);
303 extern CORE_ADDR
sigtramp_saved_pc (struct frame_info
*);
305 extern CORE_ADDR
generic_read_register_dummy (CORE_ADDR pc
,
307 extern void generic_push_dummy_frame (void);
308 extern void generic_pop_current_frame (void (*)(struct frame_info
*));
309 extern void generic_pop_dummy_frame (void);
311 extern int generic_pc_in_call_dummy (CORE_ADDR pc
,
312 CORE_ADDR sp
, CORE_ADDR fp
);
313 extern char *generic_find_dummy_frame (CORE_ADDR pc
, CORE_ADDR fp
);
315 extern void generic_fix_call_dummy (char *dummy
, CORE_ADDR pc
, CORE_ADDR fun
,
316 int nargs
, struct value
**args
,
317 struct type
*type
, int gcc_p
);
319 extern void generic_get_saved_register (char *, int *, CORE_ADDR
*,
320 struct frame_info
*, int,
323 extern void generic_unwind_get_saved_register (char *raw_buffer
,
326 struct frame_info
*frame
,
328 enum lval_type
*lval
);
330 /* Unwind the stack frame so that the value of REGNUM, in the previous
331 frame is returned. If VALUEP is NULL, don't fetch/compute the
332 value. Instead just return the location of the value. */
334 extern void frame_register_unwind (struct frame_info
*frame
, int regnum
,
335 int *optimizedp
, enum lval_type
*lvalp
,
336 CORE_ADDR
*addrp
, int *realnump
,
339 extern void generic_save_call_dummy_addr (CORE_ADDR lo
, CORE_ADDR hi
);
341 extern void get_saved_register (char *raw_buffer
, int *optimized
,
343 struct frame_info
*frame
,
344 int regnum
, enum lval_type
*lval
);
346 /* Return the register as found on the FRAME. Return zero if the
347 register could not be found. */
348 extern int frame_register_read (struct frame_info
*frame
, int regnum
,
351 #endif /* !defined (FRAME_H) */