1 /* Cache and manage frames for GDB, the GNU debugger.
3 Copyright 1986, 1987, 1989, 1991, 1994, 1995, 1996, 1998, 2000,
4 2001, 2002, 2003 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. */
27 #include "inferior.h" /* for inferior_ptid */
29 #include "gdb_assert.h"
30 #include "gdb_string.h"
31 #include "builtin-regs.h"
32 #include "gdb_obstack.h"
33 #include "dummy-frame.h"
34 #include "sentinel-frame.h"
38 #include "frame-unwind.h"
42 /* Flag to control debugging. */
44 static int frame_debug
;
46 /* Flag to indicate whether backtraces should stop at main. */
48 static int backtrace_below_main
;
50 /* Return a frame uniq ID that can be used to, later, re-find the
54 get_frame_id (struct frame_info
*fi
)
69 const struct frame_id null_frame_id
; /* All zeros. */
72 frame_id_build (CORE_ADDR base
, CORE_ADDR func_or_pc
)
81 frame_id_p (struct frame_id l
)
83 /* The .func can be NULL but the .base cannot. */
88 frame_id_eq (struct frame_id l
, struct frame_id r
)
90 /* If .base is different, the frames are different. */
93 /* Add a test to check that the frame ID's are for the same function
99 frame_id_inner (struct frame_id l
, struct frame_id r
)
101 /* Only return non-zero when strictly inner than. Note that, per
102 comment in "frame.h", there is some fuzz here. Frameless
103 functions are not strictly inner than (same .base but different
105 return INNER_THAN (l
.base
, r
.base
);
109 frame_find_by_id (struct frame_id id
)
111 struct frame_info
*frame
;
113 /* ZERO denotes the null frame, let the caller decide what to do
114 about it. Should it instead return get_current_frame()? */
115 if (!frame_id_p (id
))
118 for (frame
= get_current_frame ();
120 frame
= get_prev_frame (frame
))
122 struct frame_id
this = get_frame_id (frame
);
123 if (frame_id_eq (id
, this))
124 /* An exact match. */
126 if (frame_id_inner (id
, this))
129 /* Either, we're not yet gone far enough out along the frame
130 chain (inner(this,id), or we're comparing frameless functions
131 (same .base, different .func, no test available). Struggle
132 on until we've definitly gone to far. */
138 frame_pc_unwind (struct frame_info
*this_frame
)
140 if (!this_frame
->pc_unwind_cache_p
)
143 if (gdbarch_unwind_pc_p (current_gdbarch
))
145 /* The right way. The `pure' way. The one true way. This
146 method depends solely on the register-unwind code to
147 determine the value of registers in THIS frame, and hence
148 the value of this frame's PC (resume address). A typical
149 implementation is no more than:
151 frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
152 return extract_address (buf, size of ISA_PC_REGNUM);
154 Note: this method is very heavily dependent on a correct
155 register-unwind implementation, it pays to fix that
156 method first; this method is frame type agnostic, since
157 it only deals with register values, it works with any
158 frame. This is all in stark contrast to the old
159 FRAME_SAVED_PC which would try to directly handle all the
160 different ways that a PC could be unwound. */
161 pc
= gdbarch_unwind_pc (current_gdbarch
, this_frame
);
163 else if (this_frame
->level
< 0)
165 /* FIXME: cagney/2003-03-06: Old code and and a sentinel
166 frame. Do like was always done. Fetch the PC's value
167 direct from the global registers array (via read_pc).
168 This assumes that this frame belongs to the current
169 global register cache. The assumption is dangerous. */
172 else if (DEPRECATED_FRAME_SAVED_PC_P ())
174 /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
175 frame. Do like was always done. Note that this method,
176 unlike unwind_pc(), tries to handle all the different
177 frame cases directly. It fails. */
178 pc
= DEPRECATED_FRAME_SAVED_PC (this_frame
);
181 internal_error (__FILE__
, __LINE__
, "No gdbarch_unwind_pc method");
182 this_frame
->pc_unwind_cache
= pc
;
183 this_frame
->pc_unwind_cache_p
= 1;
185 return this_frame
->pc_unwind_cache
;
189 do_frame_unwind_register (void *src
, int regnum
, void *buf
)
191 frame_unwind_register (src
, regnum
, buf
);
196 frame_pop (struct frame_info
*this_frame
)
198 struct regcache
*scratch_regcache
;
199 struct cleanup
*cleanups
;
201 if (DEPRECATED_POP_FRAME_P ())
203 /* A legacy architecture that has implemented a custom pop
204 function. All new architectures should instead be using the
205 generic code below. */
206 DEPRECATED_POP_FRAME
;
210 /* Make a copy of all the register values unwound from this
211 frame. Save them in a scratch buffer so that there isn't a
212 race betweening trying to extract the old values from the
213 current_regcache while, at the same time writing new values
214 into that same cache. */
215 struct regcache
*scratch
= regcache_xmalloc (current_gdbarch
);
216 struct cleanup
*cleanups
= make_cleanup_regcache_xfree (scratch
);
217 regcache_save (scratch
, do_frame_unwind_register
, this_frame
);
218 /* Now copy those saved registers into the current regcache.
219 Here, regcache_cpy() calls regcache_restore(). */
220 regcache_cpy (current_regcache
, scratch
);
221 do_cleanups (cleanups
);
223 /* We've made right mess of GDB's local state, just discard
225 target_store_registers (-1);
226 flush_cached_frames ();
230 frame_register_unwind (struct frame_info
*frame
, int regnum
,
231 int *optimizedp
, enum lval_type
*lvalp
,
232 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
234 struct frame_unwind_cache
*cache
;
236 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
237 that the value proper does not need to be fetched. */
238 gdb_assert (optimizedp
!= NULL
);
239 gdb_assert (lvalp
!= NULL
);
240 gdb_assert (addrp
!= NULL
);
241 gdb_assert (realnump
!= NULL
);
242 /* gdb_assert (bufferp != NULL); */
244 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
245 is broken. There is always a frame. If there, for some reason,
246 isn't, there is some pretty busted code as it should have
247 detected the problem before calling here. */
248 gdb_assert (frame
!= NULL
);
250 /* Ask this frame to unwind its register. */
251 frame
->unwind
->reg (frame
, &frame
->unwind_cache
, regnum
,
252 optimizedp
, lvalp
, addrp
, realnump
, bufferp
);
256 frame_register (struct frame_info
*frame
, int regnum
,
257 int *optimizedp
, enum lval_type
*lvalp
,
258 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
260 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
261 that the value proper does not need to be fetched. */
262 gdb_assert (optimizedp
!= NULL
);
263 gdb_assert (lvalp
!= NULL
);
264 gdb_assert (addrp
!= NULL
);
265 gdb_assert (realnump
!= NULL
);
266 /* gdb_assert (bufferp != NULL); */
268 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
269 of the register in the register cache. It should instead return
270 the REGNUM corresponding to that register. Translate the . */
271 if (DEPRECATED_GET_SAVED_REGISTER_P ())
273 DEPRECATED_GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
,
275 /* Compute the REALNUM if the caller wants it. */
276 if (*lvalp
== lval_register
)
279 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
281 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
287 internal_error (__FILE__
, __LINE__
,
288 "Failed to compute the register number corresponding"
289 " to 0x%s", paddr_d (*addrp
));
295 /* Obtain the register value by unwinding the register from the next
296 (more inner frame). */
297 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
298 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
303 frame_unwind_register (struct frame_info
*frame
, int regnum
, void *buf
)
309 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
314 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
317 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
318 frame_unwind_register (frame
, regnum
, buf
);
319 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
323 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
326 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
327 frame_unwind_register (frame
, regnum
, buf
);
328 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
332 frame_read_register (struct frame_info
*frame
, int regnum
, void *buf
)
334 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
335 frame_unwind_register (frame
->next
, regnum
, buf
);
339 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
342 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
343 always a frame. Both this, and the equivalent
344 frame_read_signed_register() function, can only be called with a
345 valid frame. If, for some reason, this function is called
346 without a frame then the problem isn't here, but rather in the
347 caller. It should of first created a frame and then passed that
349 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
350 ``current_frame'' should not be treated as a special case. While
351 ``get_next_frame (current_frame) == NULL'' currently holds, it
352 should, as far as possible, not be relied upon. In the future,
353 ``get_next_frame (current_frame)'' may instead simply return a
354 normal frame object that simply always gets register values from
355 the register cache. Consequently, frame code should try to avoid
356 tests like ``if get_next_frame() == NULL'' and instead just rely
357 on recursive frame calls (like the below code) when manipulating
359 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
360 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
364 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
367 /* See note above in frame_read_unsigned_register(). */
368 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
369 frame_unwind_signed_register (frame
->next
, regnum
, val
);
373 generic_unwind_get_saved_register (char *raw_buffer
,
376 struct frame_info
*frame
,
378 enum lval_type
*lvalp
)
383 enum lval_type lvalx
;
385 if (!target_has_registers
)
386 error ("No registers.");
388 /* Keep things simple, ensure that all the pointers (except valuep)
390 if (optimizedp
== NULL
)
391 optimizedp
= &optimizedx
;
397 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
398 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
399 &realnumx
, raw_buffer
);
402 /* frame_register_read ()
404 Find and return the value of REGNUM for the specified stack frame.
405 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
407 Returns 0 if the register value could not be found. */
410 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
416 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
418 /* FIXME: cagney/2002-05-15: This test, is just bogus.
420 It indicates that the target failed to supply a value for a
421 register because it was "not available" at this time. Problem
422 is, the target still has the register and so get saved_register()
423 may be returning a value saved on the stack. */
425 if (register_cached (regnum
) < 0)
426 return 0; /* register value not available */
432 /* Map between a frame register number and its name. A frame register
433 space is a superset of the cooked register space --- it also
434 includes builtin registers. */
437 frame_map_name_to_regnum (const char *name
, int len
)
444 /* Search register name space. */
445 for (i
= 0; i
< NUM_REGS
+ NUM_PSEUDO_REGS
; i
++)
446 if (REGISTER_NAME (i
) && len
== strlen (REGISTER_NAME (i
))
447 && strncmp (name
, REGISTER_NAME (i
), len
) == 0)
452 /* Try builtin registers. */
453 i
= builtin_reg_map_name_to_regnum (name
, len
);
456 /* A builtin register doesn't fall into the architecture's
458 gdb_assert (i
>= NUM_REGS
+ NUM_PSEUDO_REGS
);
466 frame_map_regnum_to_name (int regnum
)
470 if (regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
)
471 return REGISTER_NAME (regnum
);
472 return builtin_reg_map_regnum_to_name (regnum
);
475 /* Create a sentinel frame. */
478 create_sentinel_frame (struct regcache
*regcache
)
480 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
481 frame
->type
= NORMAL_FRAME
;
483 /* Explicitly initialize the sentinel frame's cache. Provide it
484 with the underlying regcache. In the future additional
485 information, such as the frame's thread will be added. */
486 frame
->unwind_cache
= sentinel_frame_cache (regcache
);
487 /* For the moment there is only one sentinel frame implementation. */
488 frame
->unwind
= sentinel_frame_unwind
;
489 /* Link this frame back to itself. The frame is self referential
490 (the unwound PC is the same as the pc), so make it so. */
492 /* Always unwind the PC as part of creating this frame. This
493 ensures that the frame's PC points at something valid. */
494 /* FIXME: cagney/2003-01-10: Problem here. Unwinding a sentinel
495 frame's PC may require information such as the frame's thread's
496 stop reason. Is it possible to get to that? */
497 frame
->pc
= frame_pc_unwind (frame
);
501 /* Info about the innermost stack frame (contents of FP register) */
503 static struct frame_info
*current_frame
;
505 /* Cache for frame addresses already read by gdb. Valid only while
506 inferior is stopped. Control variables for the frame cache should
507 be local to this module. */
509 static struct obstack frame_cache_obstack
;
512 frame_obstack_zalloc (unsigned long size
)
514 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
515 memset (data
, 0, size
);
520 frame_saved_regs_zalloc (struct frame_info
*fi
)
522 fi
->saved_regs
= (CORE_ADDR
*)
523 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
524 return fi
->saved_regs
;
528 get_frame_saved_regs (struct frame_info
*fi
)
530 return fi
->saved_regs
;
533 /* Return the innermost (currently executing) stack frame. This is
534 split into two functions. The function unwind_to_current_frame()
535 is wrapped in catch exceptions so that, even when the unwind of the
536 sentinel frame fails, the function still returns a stack frame. */
539 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
541 struct frame_info
*frame
= get_prev_frame (args
);
542 /* A sentinel frame can fail to unwind, eg, because it's PC value
543 lands in somewhere like start. */
546 current_frame
= frame
;
551 get_current_frame (void)
553 /* First check, and report, the lack of registers. Having GDB
554 report "No stack!" or "No memory" when the target doesn't even
555 have registers is very confusing. Besides, "printcmd.exp"
556 explicitly checks that ``print $pc'' with no registers prints "No
558 if (!target_has_registers
)
559 error ("No registers.");
560 if (!target_has_stack
)
562 if (!target_has_memory
)
563 error ("No memory.");
564 if (current_frame
== NULL
)
566 struct frame_info
*sentinel_frame
=
567 create_sentinel_frame (current_regcache
);
568 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
569 NULL
, RETURN_MASK_ERROR
) != 0)
571 /* Oops! Fake a current frame? Is this useful? It has a PC
572 of zero, for instance. */
573 current_frame
= sentinel_frame
;
576 return current_frame
;
579 /* The "selected" stack frame is used by default for local and arg
580 access. May be zero, for no selected frame. */
582 struct frame_info
*deprecated_selected_frame
;
584 /* Return the selected frame. Always non-null (unless there isn't an
585 inferior sufficient for creating a frame) in which case an error is
589 get_selected_frame (void)
591 if (deprecated_selected_frame
== NULL
)
592 /* Hey! Don't trust this. It should really be re-finding the
593 last selected frame of the currently selected thread. This,
594 though, is better than nothing. */
595 select_frame (get_current_frame ());
596 /* There is always a frame. */
597 gdb_assert (deprecated_selected_frame
!= NULL
);
598 return deprecated_selected_frame
;
601 /* Select frame FI (or NULL - to invalidate the current frame). */
604 select_frame (struct frame_info
*fi
)
606 register struct symtab
*s
;
608 deprecated_selected_frame
= fi
;
609 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
610 frame is being invalidated. */
611 if (selected_frame_level_changed_hook
)
612 selected_frame_level_changed_hook (frame_relative_level (fi
));
614 /* FIXME: kseitz/2002-08-28: It would be nice to call
615 selected_frame_level_changed_event right here, but due to limitations
616 in the current interfaces, we would end up flooding UIs with events
617 because select_frame is used extensively internally.
619 Once we have frame-parameterized frame (and frame-related) commands,
620 the event notification can be moved here, since this function will only
621 be called when the users selected frame is being changed. */
623 /* Ensure that symbols for this frame are read in. Also, determine the
624 source language of this frame, and switch to it if desired. */
627 s
= find_pc_symtab (fi
->pc
);
629 && s
->language
!= current_language
->la_language
630 && s
->language
!= language_unknown
631 && language_mode
== language_mode_auto
)
633 set_language (s
->language
);
638 /* Return the register saved in the simplistic ``saved_regs'' cache.
639 If the value isn't here AND a value is needed, try the next inner
643 frame_saved_regs_register_unwind (struct frame_info
*frame
, void **cache
,
644 int regnum
, int *optimizedp
,
645 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
646 int *realnump
, void *bufferp
)
648 /* There is always a frame at this point. And THIS is the frame
649 we're interested in. */
650 gdb_assert (frame
!= NULL
);
651 /* If we're using generic dummy frames, we'd better not be in a call
652 dummy. (generic_call_dummy_register_unwind ought to have been called
654 gdb_assert (!(DEPRECATED_USE_GENERIC_DUMMY_FRAMES
655 && (get_frame_type (frame
) == DUMMY_FRAME
)));
657 /* Only (older) architectures that implement the
658 DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this
660 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
662 /* Load the saved_regs register cache. */
663 if (get_frame_saved_regs (frame
) == NULL
)
664 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
666 if (get_frame_saved_regs (frame
) != NULL
667 && get_frame_saved_regs (frame
)[regnum
] != 0)
669 if (regnum
== SP_REGNUM
)
671 /* SP register treated specially. */
677 store_address (bufferp
, REGISTER_RAW_SIZE (regnum
),
678 get_frame_saved_regs (frame
)[regnum
]);
682 /* Any other register is saved in memory, fetch it but cache
683 a local copy of its value. */
685 *lvalp
= lval_memory
;
686 *addrp
= get_frame_saved_regs (frame
)[regnum
];
691 /* Save each register value, as it is read in, in a
692 frame based cache. */
693 void **regs
= (*cache
);
696 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
698 regs
= frame_obstack_zalloc (sizeof_cache
);
701 if (regs
[regnum
] == NULL
)
704 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
705 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
706 REGISTER_RAW_SIZE (regnum
));
708 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
710 /* Read the value in from memory. */
711 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
712 REGISTER_RAW_SIZE (regnum
));
719 /* No luck, assume this and the next frame have the same register
720 value. Pass the request down the frame chain to the next frame.
721 Hopefully that will find the register's location, either in a
722 register or in memory. */
723 frame_register (frame
, regnum
, optimizedp
, lvalp
, addrp
, realnump
,
728 frame_saved_regs_id_unwind (struct frame_info
*next_frame
, void **cache
,
735 /* Start out by assuming it's NULL. */
736 (*id
) = null_frame_id
;
738 if (frame_relative_level (next_frame
) <= 0)
739 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
740 the frame chain, not just the inner most frame! The generic,
741 per-architecture, frame code should handle this and the below
742 should simply be removed. */
743 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
748 /* A frameless inner-most frame. The `FP' (which isn't an
749 architecture frame-pointer register!) of the caller is the same
751 /* FIXME: 2002-11-09: There isn't any reason to special case this
752 edge condition. Instead the per-architecture code should hande
754 base
= get_frame_base (next_frame
);
757 /* Two macros defined in tm.h specify the machine-dependent
758 actions to be performed here.
760 First, get the frame's chain-pointer.
762 If that is zero, the frame is the outermost frame or a leaf
763 called by the outermost frame. This means that if start
764 calls main without a frame, we'll return 0 (which is fine
767 Nope; there's a problem. This also returns when the current
768 routine is a leaf of main. This is unacceptable. We move
769 this to after the ffi test; I'd rather have backtraces from
770 start go curfluy than have an abort called from main not show
772 gdb_assert (FRAME_CHAIN_P ());
773 base
= FRAME_CHAIN (next_frame
);
775 if (!frame_chain_valid (base
, next_frame
))
781 /* FIXME: cagney/2002-06-08: This should probably return the frame's
782 function and not the PC (a.k.a. resume address). */
783 pc
= frame_pc_unwind (next_frame
);
788 const struct frame_unwind trad_frame_unwinder
= {
789 frame_saved_regs_id_unwind
,
790 frame_saved_regs_register_unwind
792 const struct frame_unwind
*trad_frame_unwind
= &trad_frame_unwinder
;
795 /* Function: deprecated_generic_get_saved_register
797 Find register number REGNUM relative to FRAME and put its (raw,
798 target format) contents in *RAW_BUFFER.
800 Set *OPTIMIZED if the variable was optimized out (and thus can't be
801 fetched). Note that this is never set to anything other than zero
802 in this implementation.
804 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
805 whether the value was fetched from memory, from a register, or in a
806 strange and non-modifiable way (e.g. a frame pointer which was
807 calculated rather than fetched). We will use not_lval for values
808 fetched from generic dummy frames.
810 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
811 offset into the registers array. If the value is stored in a dummy
812 frame, set *ADDRP to zero.
814 The argument RAW_BUFFER must point to aligned memory. */
817 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
819 struct frame_info
*frame
, int regnum
,
820 enum lval_type
*lval
)
822 if (!target_has_registers
)
823 error ("No registers.");
825 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
827 /* Normal systems don't optimize out things with register numbers. */
828 if (optimized
!= NULL
)
831 if (addrp
) /* default assumption: not found in memory */
834 /* Note: since the current frame's registers could only have been
835 saved by frames INTERIOR TO the current frame, we skip examining
836 the current frame itself: otherwise, we would be getting the
837 previous frame's registers which were saved by the current frame. */
841 for (frame
= get_next_frame (frame
);
842 frame_relative_level (frame
) >= 0;
843 frame
= get_next_frame (frame
))
845 if (get_frame_type (frame
) == DUMMY_FRAME
)
847 if (lval
) /* found it in a CALL_DUMMY frame */
850 /* FIXME: cagney/2002-06-26: This should be via the
851 gdbarch_register_read() method so that it, on the
852 fly, constructs either a raw or pseudo register
853 from the raw register cache. */
855 (generic_find_dummy_frame (get_frame_pc (frame
),
856 get_frame_base (frame
)),
861 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
862 if (get_frame_saved_regs (frame
) != NULL
863 && get_frame_saved_regs (frame
)[regnum
] != 0)
865 if (lval
) /* found it saved on the stack */
867 if (regnum
== SP_REGNUM
)
869 if (raw_buffer
) /* SP register treated specially */
870 store_address (raw_buffer
, REGISTER_RAW_SIZE (regnum
),
871 get_frame_saved_regs (frame
)[regnum
]);
875 if (addrp
) /* any other register */
876 *addrp
= get_frame_saved_regs (frame
)[regnum
];
878 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
879 REGISTER_RAW_SIZE (regnum
));
886 /* If we get thru the loop to this point, it means the register was
887 not saved in any frame. Return the actual live-register value. */
889 if (lval
) /* found it in a live register */
890 *lval
= lval_register
;
892 *addrp
= REGISTER_BYTE (regnum
);
894 deprecated_read_register_gen (regnum
, raw_buffer
);
897 /* Determine the frame's type based on its PC. */
899 static enum frame_type
900 frame_type_from_pc (CORE_ADDR pc
)
902 /* FIXME: cagney/2002-11-24: Can't yet directly call
903 pc_in_dummy_frame() as some architectures don't set
904 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
905 latter is implemented by simply calling pc_in_dummy_frame). */
906 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
907 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
912 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
913 if (PC_IN_SIGTRAMP (pc
, name
))
914 return SIGTRAMP_FRAME
;
920 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
921 Always returns a non-NULL value. */
924 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
926 struct frame_info
*fi
;
928 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
932 fi
->next
= create_sentinel_frame (current_regcache
);
933 fi
->type
= frame_type_from_pc (pc
);
935 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
936 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi
);
938 /* Select/initialize an unwind function. */
939 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, fi
->pc
);
944 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
945 innermost frame). Be careful to not fall off the bottom of the
946 frame chain and onto the sentinel frame. */
949 get_next_frame (struct frame_info
*this_frame
)
951 if (this_frame
->level
> 0)
952 return this_frame
->next
;
957 /* Flush the entire frame cache. */
960 flush_cached_frames (void)
962 /* Since we can't really be sure what the first object allocated was */
963 obstack_free (&frame_cache_obstack
, 0);
964 obstack_init (&frame_cache_obstack
);
966 current_frame
= NULL
; /* Invalidate cache */
968 annotate_frames_invalid ();
971 /* Flush the frame cache, and start a new one if necessary. */
974 reinit_frame_cache (void)
976 flush_cached_frames ();
978 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
979 if (PIDGET (inferior_ptid
) != 0)
981 select_frame (get_current_frame ());
985 /* Create the previous frame using the deprecated methods
986 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
988 static struct frame_info
*
989 legacy_get_prev_frame (struct frame_info
*this_frame
)
991 CORE_ADDR address
= 0;
992 struct frame_info
*prev
;
995 /* This code only works on normal frames. A sentinel frame, where
996 the level is -1, should never reach this code. */
997 gdb_assert (this_frame
->level
>= 0);
999 /* On some machines it is possible to call a function without
1000 setting up a stack frame for it. On these machines, we
1001 define this macro to take two args; a frameinfo pointer
1002 identifying a frame and a variable to set or clear if it is
1003 or isn't leafless. */
1005 /* Still don't want to worry about this except on the innermost
1006 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1007 function invocation. */
1008 if (this_frame
->level
== 0)
1009 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1010 the frame chain, not just the inner most frame! The generic,
1011 per-architecture, frame code should handle this and the below
1012 should simply be removed. */
1013 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (this_frame
);
1018 /* A frameless inner-most frame. The `FP' (which isn't an
1019 architecture frame-pointer register!) of the caller is the same
1021 /* FIXME: 2002-11-09: There isn't any reason to special case this
1022 edge condition. Instead the per-architecture code should hande
1024 address
= get_frame_base (this_frame
);
1027 /* Two macros defined in tm.h specify the machine-dependent
1028 actions to be performed here.
1030 First, get the frame's chain-pointer.
1032 If that is zero, the frame is the outermost frame or a leaf
1033 called by the outermost frame. This means that if start
1034 calls main without a frame, we'll return 0 (which is fine
1037 Nope; there's a problem. This also returns when the current
1038 routine is a leaf of main. This is unacceptable. We move
1039 this to after the ffi test; I'd rather have backtraces from
1040 start go curfluy than have an abort called from main not show
1042 gdb_assert (FRAME_CHAIN_P ());
1043 address
= FRAME_CHAIN (this_frame
);
1045 if (!frame_chain_valid (address
, this_frame
))
1051 /* Create an initially zero previous frame. */
1052 prev
= frame_obstack_zalloc (sizeof (struct frame_info
));
1055 this_frame
->prev
= prev
;
1056 prev
->next
= this_frame
;
1057 prev
->frame
= address
;
1058 prev
->level
= this_frame
->level
+ 1;
1059 /* FIXME: cagney/2002-11-18: Should be setting the frame's type
1060 here, before anything else, and not last. Various INIT functions
1061 are full of work-arounds for the frames type not being set
1062 correctly from the word go. Ulgh! */
1063 prev
->type
= NORMAL_FRAME
;
1065 /* This change should not be needed, FIXME! We should determine
1066 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1067 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1068 way to express what goes on here.
1070 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1071 create_new_frame (where the PC is already set up) and here (where
1072 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1073 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1075 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1076 requires the PC value (which hasn't been set yet). Some other
1077 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1078 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1080 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1081 complication to an already overcomplicated part of GDB.
1082 gnu@cygnus.com, 15Sep92.
1084 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1085 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1087 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1088 (read_fp ()), read_pc ()). Machines with extra frame info would
1089 do that (or the local equivalent) and then set the extra fields.
1091 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1092 create_new_frame would no longer init extra frame info;
1093 SETUP_ARBITRARY_FRAME would have to do that.
1095 INIT_PREV_FRAME(fromleaf, prev) Replace
1096 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1097 This should also return a flag saying whether to keep the new
1098 frame, or whether to discard it, because on some machines (e.g.
1099 mips) it is really awkward to have FRAME_CHAIN_VALID called
1100 BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good way to
1101 get information deduced in FRAME_CHAIN_VALID into the extra
1102 fields of the new frame). std_frame_pc(fromleaf, prev)
1104 This is the default setting for INIT_PREV_FRAME. It just does
1105 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1106 will call it from INIT_PREV_FRAME (either at the beginning, the
1107 end, or in the middle). Some machines won't use it.
1109 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1111 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1112 reason for things to be this complicated.
1114 The trick is to assume that there is always a frame. Instead of
1115 special casing the inner-most frame, create fake frame
1116 (containing the hardware registers) that is inner to the
1117 user-visible inner-most frame (...) and then unwind from that.
1118 That way architecture code can use use the standard
1119 frame_XX_unwind() functions and not differentiate between the
1120 inner most and any other case.
1122 Since there is always a frame to unwind from, there is always
1123 somewhere (THIS_FRAME) to store all the info needed to construct
1124 a new (previous) frame without having to first create it. This
1125 means that the convolution below - needing to carefully order a
1126 frame's initialization - isn't needed.
1128 The irony here though, is that FRAME_CHAIN(), at least for a more
1129 up-to-date architecture, always calls FRAME_SAVED_PC(), and
1130 FRAME_SAVED_PC() computes the PC but without first needing the
1131 frame! Instead of the convolution below, we could have simply
1132 called FRAME_SAVED_PC() and been done with it! Note that
1133 FRAME_SAVED_PC() is being superseed by frame_pc_unwind() and that
1134 function does have somewhere to cache that PC value. */
1136 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1137 prev
->pc
= (DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
, prev
));
1139 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1140 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1142 /* This entry is in the frame queue now, which is good since
1143 FRAME_SAVED_PC may use that queue to figure out its value (see
1144 tm-sparc.h). We want the pc saved in the inferior frame. */
1145 if (DEPRECATED_INIT_FRAME_PC_P ())
1146 prev
->pc
= DEPRECATED_INIT_FRAME_PC (fromleaf
, prev
);
1148 /* If ->frame and ->pc are unchanged, we are in the process of
1149 getting ourselves into an infinite backtrace. Some architectures
1150 check this in FRAME_CHAIN or thereabouts, but it seems like there
1151 is no reason this can't be an architecture-independent check. */
1152 if (prev
->frame
== this_frame
->frame
1153 && prev
->pc
== this_frame
->pc
)
1155 this_frame
->prev
= NULL
;
1156 obstack_free (&frame_cache_obstack
, prev
);
1160 /* Initialize the code used to unwind the frame PREV based on the PC
1161 (and probably other architectural information). The PC lets you
1162 check things like the debug info at that point (dwarf2cfi?) and
1163 use that to decide how the frame should be unwound. */
1164 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, prev
->pc
);
1166 /* NOTE: cagney/2002-11-18: The code segments, found in
1167 create_new_frame and get_prev_frame(), that initializes the
1168 frames type is subtly different. The latter only updates ->type
1169 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1170 get_prev_frame() overriding the frame's type when the INIT code
1171 has previously set it. This is really somewhat bogus. The
1172 initialization, as seen in create_new_frame(), should occur
1173 before the INIT function has been called. */
1174 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1175 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1176 ? DEPRECATED_PC_IN_CALL_DUMMY (prev
->pc
, 0, 0)
1177 : pc_in_dummy_frame (prev
->pc
)))
1178 prev
->type
= DUMMY_FRAME
;
1181 /* FIXME: cagney/2002-11-10: This should be moved to before the
1182 INIT code above so that the INIT code knows what the frame's
1183 type is (in fact, for a [generic] dummy-frame, the type can
1184 be set and then the entire initialization can be skipped.
1185 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1188 find_pc_partial_function (prev
->pc
, &name
, NULL
, NULL
);
1189 if (PC_IN_SIGTRAMP (prev
->pc
, name
))
1190 prev
->type
= SIGTRAMP_FRAME
;
1191 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1192 architectures are forcing the frame's type in INIT so we
1193 don't want to override it here. Remember, NORMAL_FRAME == 0,
1194 so it all works (just :-/). Once this initialization is
1195 moved to the start of this function, all this nastness will
1202 /* Return a structure containing various interesting information
1203 about the frame that called THIS_FRAME. Returns NULL
1204 if there is no such frame. */
1207 get_prev_frame (struct frame_info
*this_frame
)
1209 struct frame_info
*prev_frame
;
1211 /* Return the inner-most frame, when the caller passes in NULL. */
1212 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1213 caller should have previously obtained a valid frame using
1214 get_selected_frame() and then called this code - only possibility
1215 I can think of is code behaving badly.
1217 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1218 block_innermost_frame(). It does the sequence: frame = NULL;
1219 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1220 it couldn't be written better, I don't know.
1222 NOTE: cagney/2003-01-11: I suspect what is happening is
1223 block_innermost_frame() is, when the target has no state
1224 (registers, memory, ...), still calling this function. The
1225 assumption being that this function will return NULL indicating
1226 that a frame isn't possible, rather than checking that the target
1227 has state and then calling get_current_frame() and
1228 get_prev_frame(). This is a guess mind. */
1229 if (this_frame
== NULL
)
1231 /* NOTE: cagney/2002-11-09: There was a code segment here that
1232 would error out when CURRENT_FRAME was NULL. The comment
1233 that went with it made the claim ...
1235 ``This screws value_of_variable, which just wants a nice
1236 clean NULL return from block_innermost_frame if there are no
1237 frames. I don't think I've ever seen this message happen
1238 otherwise. And returning NULL here is a perfectly legitimate
1241 Per the above, this code shouldn't even be called with a NULL
1243 return current_frame
;
1246 /* There is always a frame. If this assertion fails, suspect that
1247 something should be calling get_selected_frame() or
1248 get_current_frame(). */
1249 gdb_assert (this_frame
!= NULL
);
1251 if (this_frame
->level
>= 0
1252 && !backtrace_below_main
1253 && inside_main_func (get_frame_pc (this_frame
)))
1254 /* Don't unwind past main(), bug always unwind the sentinel frame.
1255 Note, this is done _before_ the frame has been marked as
1256 previously unwound. That way if the user later decides to
1257 allow unwinds past main(), that just happens. */
1260 fprintf_unfiltered (gdb_stdlog
,
1261 "Outermost frame - inside main func.\n");
1265 /* Only try to do the unwind once. */
1266 if (this_frame
->prev_p
)
1267 return this_frame
->prev
;
1268 this_frame
->prev_p
= 1;
1270 /* If we're inside the entry file, it isn't valid. Don't apply this
1271 test to a dummy frame - dummy frame PC's typically land in the
1272 entry file. Don't apply this test to the sentinel frame.
1273 Sentinel frames should always be allowed to unwind. */
1274 /* NOTE: drow/2002-12-25: should there be a way to disable this
1275 check? It assumes a single small entry file, and the way some
1276 debug readers (e.g. dbxread) figure out which object is the
1277 entry file is somewhat hokey. */
1278 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1279 then it should probably be moved to before the ->prev_p test,
1281 if (this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1282 && inside_entry_file (get_frame_pc (this_frame
)))
1285 fprintf_unfiltered (gdb_stdlog
,
1286 "Outermost frame - inside entry file\n");
1290 /* If we're already inside the entry function for the main objfile,
1291 then it isn't valid. Don't apply this test to a dummy frame -
1292 dummy frame PC's typically land in the entry func. Don't apply
1293 this test to the sentinel frame. Sentinel frames should always
1294 be allowed to unwind. */
1295 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1296 hard evidence that this is needed. */
1298 && this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1299 && inside_entry_func (get_frame_pc (this_frame
)))
1302 fprintf_unfiltered (gdb_stdlog
,
1303 "Outermost frame - inside entry func\n");
1307 /* If any of the old frame initialization methods are around, use
1308 the legacy get_prev_frame method. Just don't try to unwind a
1309 sentinel frame using that method - it doesn't work. All sentinal
1310 frames use the new unwind code. */
1311 if (legacy_frame_p (current_gdbarch
)
1312 && this_frame
->level
>= 0)
1314 prev_frame
= legacy_get_prev_frame (this_frame
);
1315 if (frame_debug
&& prev_frame
== NULL
)
1316 fprintf_unfiltered (gdb_stdlog
,
1317 "Outermost frame - legacy_get_prev_frame NULL.\n");
1321 /* Allocate the new frame but do not wire it in to the frame chain.
1322 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1323 frame->next to pull some fancy tricks (of course such code is, by
1324 definition, recursive). Try to prevent it.
1326 There is no reason to worry about memory leaks, should the
1327 remainder of the function fail. The allocated memory will be
1328 quickly reclaimed when the frame cache is flushed, and the `we've
1329 been here before' check above will stop repeated memory
1330 allocation calls. */
1331 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1332 prev_frame
->level
= this_frame
->level
+ 1;
1334 /* Try to unwind the PC. If that doesn't work, assume we've reached
1335 the oldest frame and simply return. Is there a better sentinal
1336 value? The unwound PC value is then used to initialize the new
1337 previous frame's type.
1339 Note that the pc-unwind is intentionally performed before the
1340 frame chain. This is ok since, for old targets, both
1341 frame_pc_unwind (nee, FRAME_SAVED_PC) and FRAME_CHAIN()) assume
1342 THIS_FRAME's data structures have already been initialized (using
1343 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1346 By unwinding the PC first, it becomes possible to, in the case of
1347 a dummy frame, avoid also unwinding the frame ID. This is
1348 because (well ignoring the PPC) a dummy frame can be located
1349 using THIS_FRAME's frame ID. */
1351 prev_frame
->pc
= frame_pc_unwind (this_frame
);
1352 if (prev_frame
->pc
== 0)
1354 /* The allocated PREV_FRAME will be reclaimed when the frame
1355 obstack is next purged. */
1357 fprintf_unfiltered (gdb_stdlog
,
1358 "Outermost frame - unwound PC zero\n");
1361 prev_frame
->type
= frame_type_from_pc (prev_frame
->pc
);
1363 /* Set the unwind functions based on that identified PC. */
1364 prev_frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1367 /* Find the prev's frame's ID. */
1368 switch (prev_frame
->type
)
1371 /* When unwinding a normal frame, the stack structure is
1372 determined by analyzing the frame's function's code (be it
1373 using brute force prologue analysis, or the dwarf2 CFI). In
1374 the case of a dummy frame, that simply isn't possible. The
1375 The PC is either the program entry point, or some random
1376 address on the stack. Trying to use that PC to apply
1377 standard frame ID unwind techniques is just asking for
1379 if (gdbarch_unwind_dummy_id_p (current_gdbarch
))
1381 /* Assume hand_function_call(), via SAVE_DUMMY_FRAME_TOS,
1382 previously saved the dummy frame's ID. Things only work
1383 if the two return the same value. */
1384 gdb_assert (SAVE_DUMMY_FRAME_TOS_P ());
1385 /* Use an architecture specific method to extract the prev's
1386 dummy ID from the next frame. Note that this method uses
1387 frame_register_unwind to obtain the register values
1388 needed to determine the dummy frame's ID. */
1389 prev_frame
->id
= gdbarch_unwind_dummy_id (current_gdbarch
,
1392 else if (this_frame
->level
< 0)
1394 /* We're unwinding a sentinel frame, the PC of which is
1395 pointing at a stack dummy. Fake up the dummy frame's ID
1396 using the same sequence as is found a traditional
1397 unwinder. Once all architectures supply the
1398 unwind_dummy_id method, this code can go away. */
1399 prev_frame
->id
.base
= read_fp ();
1400 prev_frame
->id
.pc
= read_pc ();
1404 /* Outch! We're not on the innermost frame yet we're trying
1405 to unwind to a dummy. The architecture must provide the
1406 unwind_dummy_id() method. Abandon the unwind process but
1407 only after first warning the user. */
1408 internal_warning (__FILE__
, __LINE__
,
1409 "Missing unwind_dummy_id architecture method");
1414 case SIGTRAMP_FRAME
:
1415 /* FIXME: cagney/2003-03-04: The below call isn't right. It
1416 should instead be doing something like "prev_frame -> unwind
1417 -> id (this_frame, & prev_frame -> unwind_cache, & prev_frame
1418 -> id)" but that requires more extensive (pending) changes. */
1419 this_frame
->unwind
->id (this_frame
, &this_frame
->unwind_cache
,
1421 /* Check that the unwound ID is valid. */
1422 if (!frame_id_p (prev_frame
->id
))
1425 fprintf_unfiltered (gdb_stdlog
,
1426 "Outermost frame - unwound frame ID invalid\n");
1429 /* Check that the new frame isn't inner to (younger, below,
1430 next) the old frame. If that happens the frame unwind is
1432 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1433 that doesn't have a valid frame ID. Should instead set the
1434 sentinel frame's frame ID to a `sentinel'. Leave it until
1435 after the switch to storing the frame ID, instead of the
1436 frame base, in the frame object. */
1437 if (this_frame
->level
>= 0
1438 && frame_id_inner (prev_frame
->id
, get_frame_id (this_frame
)))
1439 error ("Unwound frame inner-to selected frame (corrupt stack?)");
1440 /* Note that, due to frameless functions, the stronger test of
1441 the new frame being outer to the old frame can't be used -
1442 frameless functions differ by only their PC value. */
1445 internal_error (__FILE__
, __LINE__
, "bad switch");
1448 /* FIXME: cagney/2002-12-18: Instead of this hack, should only store
1449 the frame ID in PREV_FRAME. Unfortunatly, some architectures
1450 (HP/UX) still reply on EXTRA_FRAME_INFO and, hence, still poke at
1451 the "struct frame_info" object directly. */
1452 prev_frame
->frame
= prev_frame
->id
.base
;
1455 this_frame
->prev
= prev_frame
;
1456 prev_frame
->next
= this_frame
;
1458 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1459 initializing extra info, all frames will use the frame_cache
1460 (passed to the unwind functions) to store additional frame info.
1461 Unfortunatly legacy targets can't use legacy_get_prev_frame() to
1462 unwind the sentinel frame and, consequently, are forced to take
1463 this code path and rely on the below call to
1464 DEPRECATED_INIT_EXTRA_FRAME_INFO to initialize the inner-most
1466 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1468 gdb_assert (prev_frame
->level
== 0);
1469 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev_frame
);
1476 get_frame_pc (struct frame_info
*frame
)
1482 pc_notcurrent (struct frame_info
*frame
)
1484 /* If FRAME is not the innermost frame, that normally means that
1485 FRAME->pc points at the return instruction (which is *after* the
1486 call instruction), and we want to get the line containing the
1487 call (because the call is where the user thinks the program is).
1488 However, if the next frame is either a SIGTRAMP_FRAME or a
1489 DUMMY_FRAME, then the next frame will contain a saved interrupt
1490 PC and such a PC indicates the current (rather than next)
1491 instruction/line, consequently, for such cases, want to get the
1492 line containing fi->pc. */
1493 struct frame_info
*next
= get_next_frame (frame
);
1494 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
1499 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
1501 (*sal
) = find_pc_line (frame
->pc
, pc_notcurrent (frame
));
1504 /* Per "frame.h", return the ``address'' of the frame. Code should
1505 really be using get_frame_id(). */
1507 get_frame_base (struct frame_info
*fi
)
1512 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
1513 or -1 for a NULL frame. */
1516 frame_relative_level (struct frame_info
*fi
)
1525 get_frame_type (struct frame_info
*frame
)
1527 /* Some targets still don't use [generic] dummy frames. Catch them
1529 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1530 && deprecated_frame_in_dummy (frame
))
1536 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
1538 /* Arrrg! See comment in "frame.h". */
1542 #ifdef FRAME_FIND_SAVED_REGS
1543 /* XXX - deprecated. This is a compatibility function for targets
1544 that do not yet implement DEPRECATED_FRAME_INIT_SAVED_REGS. */
1545 /* Find the addresses in which registers are saved in FRAME. */
1548 deprecated_get_frame_saved_regs (struct frame_info
*frame
,
1549 struct frame_saved_regs
*saved_regs_addr
)
1551 if (frame
->saved_regs
== NULL
)
1553 frame
->saved_regs
= (CORE_ADDR
*)
1554 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
1556 if (saved_regs_addr
== NULL
)
1558 struct frame_saved_regs saved_regs
;
1559 FRAME_FIND_SAVED_REGS (frame
, saved_regs
);
1560 memcpy (frame
->saved_regs
, &saved_regs
, SIZEOF_FRAME_SAVED_REGS
);
1564 FRAME_FIND_SAVED_REGS (frame
, *saved_regs_addr
);
1565 memcpy (frame
->saved_regs
, saved_regs_addr
, SIZEOF_FRAME_SAVED_REGS
);
1570 struct frame_extra_info
*
1571 get_frame_extra_info (struct frame_info
*fi
)
1573 return fi
->extra_info
;
1576 struct frame_extra_info
*
1577 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
1579 fi
->extra_info
= frame_obstack_zalloc (size
);
1580 return fi
->extra_info
;
1584 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
1586 /* See comment in "frame.h". */
1588 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
1589 maintaining a locally allocated frame object. Since such frame's
1590 are not in the frame chain, it isn't possible to assume that the
1591 frame has a next. Sigh. */
1592 if (frame
->next
!= NULL
)
1594 /* While we're at it, update this frame's cached PC value, found
1595 in the next frame. Oh for the day when "struct frame_info"
1596 is opaque and this hack on hack can just go away. */
1597 frame
->next
->pc_unwind_cache
= pc
;
1598 frame
->next
->pc_unwind_cache_p
= 1;
1603 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
1605 /* See comment in "frame.h". */
1606 frame
->frame
= base
;
1610 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
1611 CORE_ADDR
*saved_regs
)
1613 frame
->saved_regs
= saved_regs
;
1617 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
1618 struct frame_extra_info
*extra_info
)
1620 frame
->extra_info
= extra_info
;
1624 deprecated_set_frame_next_hack (struct frame_info
*fi
,
1625 struct frame_info
*next
)
1631 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
1632 struct frame_info
*prev
)
1638 deprecated_get_frame_context (struct frame_info
*fi
)
1644 deprecated_set_frame_context (struct frame_info
*fi
,
1645 struct context
*context
)
1647 fi
->context
= context
;
1651 deprecated_frame_xmalloc (void)
1653 struct frame_info
*frame
= XMALLOC (struct frame_info
);
1654 memset (frame
, 0, sizeof (struct frame_info
));
1659 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
1660 long sizeof_extra_info
)
1662 struct frame_info
*frame
= deprecated_frame_xmalloc ();
1663 make_cleanup (xfree
, frame
);
1664 if (sizeof_saved_regs
> 0)
1666 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
1667 make_cleanup (xfree
, frame
->saved_regs
);
1669 if (sizeof_extra_info
> 0)
1671 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
1672 make_cleanup (xfree
, frame
->extra_info
);
1678 legacy_frame_p (struct gdbarch
*current_gdbarch
)
1680 return (DEPRECATED_INIT_FRAME_PC_P ()
1681 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
1682 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
1683 || FRAME_CHAIN_P ());
1687 _initialize_frame (void)
1689 obstack_init (&frame_cache_obstack
);
1691 /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
1692 `set backtrace {past,beyond,...}-main'. Also suggest adding `set
1693 backtrace ...-start' to control backtraces past start. The
1694 problem with `below' is that it stops the `up' command. */
1696 add_setshow_boolean_cmd ("backtrace-below-main", class_obscure
,
1697 &backtrace_below_main
, "\
1698 Set whether backtraces should continue past \"main\".\n\
1699 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1700 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1701 of the stack trace.", "\
1702 Show whether backtraces should continue past \"main\".\n\
1703 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1704 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1705 of the stack trace.",
1706 NULL
, NULL
, &setlist
, &showlist
);
1709 /* Debug this files internals. */
1710 add_show_from_set (add_set_cmd ("frame", class_maintenance
, var_zinteger
,
1711 &frame_debug
, "Set frame debugging.\n\
1712 When non-zero, frame specific internal debugging is enabled.", &setdebuglist
),