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
;
203 /* A legacy architecture that has implemented a custom pop
204 function. All new architectures should instead be using the
205 generic code below. */
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 (GET_SAVED_REGISTER_P ())
273 GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
, regnum
, lvalp
);
274 /* Compute the REALNUM if the caller wants it. */
275 if (*lvalp
== lval_register
)
278 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
280 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
286 internal_error (__FILE__
, __LINE__
,
287 "Failed to compute the register number corresponding"
288 " to 0x%s", paddr_d (*addrp
));
294 /* Obtain the register value by unwinding the register from the next
295 (more inner frame). */
296 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
297 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
302 frame_unwind_register (struct frame_info
*frame
, int regnum
, void *buf
)
308 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
313 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
316 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
317 frame_unwind_register (frame
, regnum
, buf
);
318 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
322 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
325 void *buf
= alloca (MAX_REGISTER_RAW_SIZE
);
326 frame_unwind_register (frame
, regnum
, buf
);
327 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
331 frame_read_register (struct frame_info
*frame
, int regnum
, void *buf
)
333 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
334 frame_unwind_register (frame
->next
, regnum
, buf
);
338 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
341 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
342 always a frame. Both this, and the equivalent
343 frame_read_signed_register() function, can only be called with a
344 valid frame. If, for some reason, this function is called
345 without a frame then the problem isn't here, but rather in the
346 caller. It should of first created a frame and then passed that
348 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
349 ``current_frame'' should not be treated as a special case. While
350 ``get_next_frame (current_frame) == NULL'' currently holds, it
351 should, as far as possible, not be relied upon. In the future,
352 ``get_next_frame (current_frame)'' may instead simply return a
353 normal frame object that simply always gets register values from
354 the register cache. Consequently, frame code should try to avoid
355 tests like ``if get_next_frame() == NULL'' and instead just rely
356 on recursive frame calls (like the below code) when manipulating
358 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
359 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
363 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
366 /* See note above in frame_read_unsigned_register(). */
367 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
368 frame_unwind_signed_register (frame
->next
, regnum
, val
);
372 generic_unwind_get_saved_register (char *raw_buffer
,
375 struct frame_info
*frame
,
377 enum lval_type
*lvalp
)
382 enum lval_type lvalx
;
384 if (!target_has_registers
)
385 error ("No registers.");
387 /* Keep things simple, ensure that all the pointers (except valuep)
389 if (optimizedp
== NULL
)
390 optimizedp
= &optimizedx
;
396 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
397 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
398 &realnumx
, raw_buffer
);
402 get_saved_register (char *raw_buffer
,
405 struct frame_info
*frame
,
407 enum lval_type
*lval
)
409 if (GET_SAVED_REGISTER_P ())
411 GET_SAVED_REGISTER (raw_buffer
, optimized
, addrp
, frame
, regnum
, lval
);
414 generic_unwind_get_saved_register (raw_buffer
, optimized
, addrp
, frame
,
418 /* frame_register_read ()
420 Find and return the value of REGNUM for the specified stack frame.
421 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
423 Returns 0 if the register value could not be found. */
426 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
432 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
434 /* FIXME: cagney/2002-05-15: This test, is just bogus.
436 It indicates that the target failed to supply a value for a
437 register because it was "not available" at this time. Problem
438 is, the target still has the register and so get saved_register()
439 may be returning a value saved on the stack. */
441 if (register_cached (regnum
) < 0)
442 return 0; /* register value not available */
448 /* Map between a frame register number and its name. A frame register
449 space is a superset of the cooked register space --- it also
450 includes builtin registers. */
453 frame_map_name_to_regnum (const char *name
, int len
)
460 /* Search register name space. */
461 for (i
= 0; i
< NUM_REGS
+ NUM_PSEUDO_REGS
; i
++)
462 if (REGISTER_NAME (i
) && len
== strlen (REGISTER_NAME (i
))
463 && strncmp (name
, REGISTER_NAME (i
), len
) == 0)
468 /* Try builtin registers. */
469 i
= builtin_reg_map_name_to_regnum (name
, len
);
472 /* A builtin register doesn't fall into the architecture's
474 gdb_assert (i
>= NUM_REGS
+ NUM_PSEUDO_REGS
);
482 frame_map_regnum_to_name (int regnum
)
486 if (regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
)
487 return REGISTER_NAME (regnum
);
488 return builtin_reg_map_regnum_to_name (regnum
);
491 /* Create a sentinel frame. */
494 create_sentinel_frame (struct regcache
*regcache
)
496 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
497 frame
->type
= NORMAL_FRAME
;
499 /* Explicitly initialize the sentinel frame's cache. Provide it
500 with the underlying regcache. In the future additional
501 information, such as the frame's thread will be added. */
502 frame
->unwind_cache
= sentinel_frame_cache (regcache
);
503 /* For the moment there is only one sentinel frame implementation. */
504 frame
->unwind
= sentinel_frame_unwind
;
505 /* Link this frame back to itself. The frame is self referential
506 (the unwound PC is the same as the pc), so make it so. */
508 /* Always unwind the PC as part of creating this frame. This
509 ensures that the frame's PC points at something valid. */
510 /* FIXME: cagney/2003-01-10: Problem here. Unwinding a sentinel
511 frame's PC may require information such as the frame's thread's
512 stop reason. Is it possible to get to that? */
513 frame
->pc
= frame_pc_unwind (frame
);
517 /* Info about the innermost stack frame (contents of FP register) */
519 static struct frame_info
*current_frame
;
521 /* Cache for frame addresses already read by gdb. Valid only while
522 inferior is stopped. Control variables for the frame cache should
523 be local to this module. */
525 static struct obstack frame_cache_obstack
;
528 frame_obstack_zalloc (unsigned long size
)
530 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
531 memset (data
, 0, size
);
536 frame_saved_regs_zalloc (struct frame_info
*fi
)
538 fi
->saved_regs
= (CORE_ADDR
*)
539 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
540 return fi
->saved_regs
;
544 get_frame_saved_regs (struct frame_info
*fi
)
546 return fi
->saved_regs
;
549 /* Return the innermost (currently executing) stack frame. This is
550 split into two functions. The function unwind_to_current_frame()
551 is wrapped in catch exceptions so that, even when the unwind of the
552 sentinel frame fails, the function still returns a stack frame. */
555 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
557 struct frame_info
*frame
= get_prev_frame (args
);
558 /* A sentinel frame can fail to unwind, eg, because it's PC value
559 lands in somewhere like start. */
562 current_frame
= frame
;
567 get_current_frame (void)
569 if (!target_has_stack
)
571 if (!target_has_registers
)
572 error ("No registers.");
573 if (!target_has_memory
)
574 error ("No memory.");
575 if (current_frame
== NULL
)
577 struct frame_info
*sentinel_frame
=
578 create_sentinel_frame (current_regcache
);
579 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
580 NULL
, RETURN_MASK_ERROR
) != 0)
582 /* Oops! Fake a current frame? Is this useful? It has a PC
583 of zero, for instance. */
584 current_frame
= sentinel_frame
;
587 return current_frame
;
590 /* The "selected" stack frame is used by default for local and arg
591 access. May be zero, for no selected frame. */
593 struct frame_info
*deprecated_selected_frame
;
595 /* Return the selected frame. Always non-null (unless there isn't an
596 inferior sufficient for creating a frame) in which case an error is
600 get_selected_frame (void)
602 if (deprecated_selected_frame
== NULL
)
603 /* Hey! Don't trust this. It should really be re-finding the
604 last selected frame of the currently selected thread. This,
605 though, is better than nothing. */
606 select_frame (get_current_frame ());
607 /* There is always a frame. */
608 gdb_assert (deprecated_selected_frame
!= NULL
);
609 return deprecated_selected_frame
;
612 /* Select frame FI (or NULL - to invalidate the current frame). */
615 select_frame (struct frame_info
*fi
)
617 register struct symtab
*s
;
619 deprecated_selected_frame
= fi
;
620 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
621 frame is being invalidated. */
622 if (selected_frame_level_changed_hook
)
623 selected_frame_level_changed_hook (frame_relative_level (fi
));
625 /* FIXME: kseitz/2002-08-28: It would be nice to call
626 selected_frame_level_changed_event right here, but due to limitations
627 in the current interfaces, we would end up flooding UIs with events
628 because select_frame is used extensively internally.
630 Once we have frame-parameterized frame (and frame-related) commands,
631 the event notification can be moved here, since this function will only
632 be called when the users selected frame is being changed. */
634 /* Ensure that symbols for this frame are read in. Also, determine the
635 source language of this frame, and switch to it if desired. */
638 s
= find_pc_symtab (fi
->pc
);
640 && s
->language
!= current_language
->la_language
641 && s
->language
!= language_unknown
642 && language_mode
== language_mode_auto
)
644 set_language (s
->language
);
649 /* Return the register saved in the simplistic ``saved_regs'' cache.
650 If the value isn't here AND a value is needed, try the next inner
654 frame_saved_regs_register_unwind (struct frame_info
*frame
, void **cache
,
655 int regnum
, int *optimizedp
,
656 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
657 int *realnump
, void *bufferp
)
659 /* There is always a frame at this point. And THIS is the frame
660 we're interested in. */
661 gdb_assert (frame
!= NULL
);
662 /* If we're using generic dummy frames, we'd better not be in a call
663 dummy. (generic_call_dummy_register_unwind ought to have been called
665 gdb_assert (!(DEPRECATED_USE_GENERIC_DUMMY_FRAMES
666 && (get_frame_type (frame
) == DUMMY_FRAME
)));
668 /* Only (older) architectures that implement the
669 DEPRECATED_FRAME_INIT_SAVED_REGS method should be using this
671 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
673 /* Load the saved_regs register cache. */
674 if (get_frame_saved_regs (frame
) == NULL
)
675 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
677 if (get_frame_saved_regs (frame
) != NULL
678 && get_frame_saved_regs (frame
)[regnum
] != 0)
680 if (regnum
== SP_REGNUM
)
682 /* SP register treated specially. */
688 store_address (bufferp
, REGISTER_RAW_SIZE (regnum
),
689 get_frame_saved_regs (frame
)[regnum
]);
693 /* Any other register is saved in memory, fetch it but cache
694 a local copy of its value. */
696 *lvalp
= lval_memory
;
697 *addrp
= get_frame_saved_regs (frame
)[regnum
];
702 /* Save each register value, as it is read in, in a
703 frame based cache. */
704 void **regs
= (*cache
);
707 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
709 regs
= frame_obstack_zalloc (sizeof_cache
);
712 if (regs
[regnum
] == NULL
)
715 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
716 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
717 REGISTER_RAW_SIZE (regnum
));
719 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
721 /* Read the value in from memory. */
722 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
723 REGISTER_RAW_SIZE (regnum
));
730 /* No luck, assume this and the next frame have the same register
731 value. Pass the request down the frame chain to the next frame.
732 Hopefully that will find the register's location, either in a
733 register or in memory. */
734 frame_register (frame
, regnum
, optimizedp
, lvalp
, addrp
, realnump
,
739 frame_saved_regs_id_unwind (struct frame_info
*next_frame
, void **cache
,
746 /* Start out by assuming it's NULL. */
747 (*id
) = null_frame_id
;
749 if (frame_relative_level (next_frame
) <= 0)
750 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
751 the frame chain, not just the inner most frame! The generic,
752 per-architecture, frame code should handle this and the below
753 should simply be removed. */
754 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
759 /* A frameless inner-most frame. The `FP' (which isn't an
760 architecture frame-pointer register!) of the caller is the same
762 /* FIXME: 2002-11-09: There isn't any reason to special case this
763 edge condition. Instead the per-architecture code should hande
765 base
= get_frame_base (next_frame
);
768 /* Two macros defined in tm.h specify the machine-dependent
769 actions to be performed here.
771 First, get the frame's chain-pointer.
773 If that is zero, the frame is the outermost frame or a leaf
774 called by the outermost frame. This means that if start
775 calls main without a frame, we'll return 0 (which is fine
778 Nope; there's a problem. This also returns when the current
779 routine is a leaf of main. This is unacceptable. We move
780 this to after the ffi test; I'd rather have backtraces from
781 start go curfluy than have an abort called from main not show
783 gdb_assert (FRAME_CHAIN_P ());
784 base
= FRAME_CHAIN (next_frame
);
786 if (!frame_chain_valid (base
, next_frame
))
792 /* FIXME: cagney/2002-06-08: This should probably return the frame's
793 function and not the PC (a.k.a. resume address). */
794 pc
= frame_pc_unwind (next_frame
);
799 const struct frame_unwind trad_frame_unwinder
= {
800 frame_saved_regs_id_unwind
,
801 frame_saved_regs_register_unwind
803 const struct frame_unwind
*trad_frame_unwind
= &trad_frame_unwinder
;
806 /* Function: get_saved_register
807 Find register number REGNUM relative to FRAME and put its (raw,
808 target format) contents in *RAW_BUFFER.
810 Set *OPTIMIZED if the variable was optimized out (and thus can't be
811 fetched). Note that this is never set to anything other than zero
812 in this implementation.
814 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
815 whether the value was fetched from memory, from a register, or in a
816 strange and non-modifiable way (e.g. a frame pointer which was
817 calculated rather than fetched). We will use not_lval for values
818 fetched from generic dummy frames.
820 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
821 offset into the registers array. If the value is stored in a dummy
822 frame, set *ADDRP to zero.
824 To use this implementation, define a function called
825 "get_saved_register" in your target code, which simply passes all
826 of its arguments to this function.
828 The argument RAW_BUFFER must point to aligned memory. */
831 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
833 struct frame_info
*frame
, int regnum
,
834 enum lval_type
*lval
)
836 if (!target_has_registers
)
837 error ("No registers.");
839 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
841 /* Normal systems don't optimize out things with register numbers. */
842 if (optimized
!= NULL
)
845 if (addrp
) /* default assumption: not found in memory */
848 /* Note: since the current frame's registers could only have been
849 saved by frames INTERIOR TO the current frame, we skip examining
850 the current frame itself: otherwise, we would be getting the
851 previous frame's registers which were saved by the current frame. */
855 for (frame
= get_next_frame (frame
);
856 frame_relative_level (frame
) >= 0;
857 frame
= get_next_frame (frame
))
859 if (get_frame_type (frame
) == DUMMY_FRAME
)
861 if (lval
) /* found it in a CALL_DUMMY frame */
864 /* FIXME: cagney/2002-06-26: This should be via the
865 gdbarch_register_read() method so that it, on the
866 fly, constructs either a raw or pseudo register
867 from the raw register cache. */
869 (generic_find_dummy_frame (get_frame_pc (frame
),
870 get_frame_base (frame
)),
875 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
876 if (get_frame_saved_regs (frame
) != NULL
877 && get_frame_saved_regs (frame
)[regnum
] != 0)
879 if (lval
) /* found it saved on the stack */
881 if (regnum
== SP_REGNUM
)
883 if (raw_buffer
) /* SP register treated specially */
884 store_address (raw_buffer
, REGISTER_RAW_SIZE (regnum
),
885 get_frame_saved_regs (frame
)[regnum
]);
889 if (addrp
) /* any other register */
890 *addrp
= get_frame_saved_regs (frame
)[regnum
];
892 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
893 REGISTER_RAW_SIZE (regnum
));
900 /* If we get thru the loop to this point, it means the register was
901 not saved in any frame. Return the actual live-register value. */
903 if (lval
) /* found it in a live register */
904 *lval
= lval_register
;
906 *addrp
= REGISTER_BYTE (regnum
);
908 deprecated_read_register_gen (regnum
, raw_buffer
);
911 /* Determine the frame's type based on its PC. */
913 static enum frame_type
914 frame_type_from_pc (CORE_ADDR pc
)
916 /* FIXME: cagney/2002-11-24: Can't yet directly call
917 pc_in_dummy_frame() as some architectures don't set
918 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
919 latter is implemented by simply calling pc_in_dummy_frame). */
920 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
921 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
926 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
927 if (PC_IN_SIGTRAMP (pc
, name
))
928 return SIGTRAMP_FRAME
;
934 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
935 Always returns a non-NULL value. */
938 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
940 struct frame_info
*fi
;
942 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
946 fi
->next
= create_sentinel_frame (current_regcache
);
947 fi
->type
= frame_type_from_pc (pc
);
949 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
950 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi
);
952 /* Select/initialize an unwind function. */
953 fi
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, fi
->pc
);
958 /* Return the frame that FRAME calls (NULL if FRAME is the innermost
959 frame). Be careful to not fall off the bottom of the frame chain
960 and onto the sentinel frame. */
963 get_next_frame (struct frame_info
*frame
)
965 if (frame
->level
> 0)
971 /* Flush the entire frame cache. */
974 flush_cached_frames (void)
976 /* Since we can't really be sure what the first object allocated was */
977 obstack_free (&frame_cache_obstack
, 0);
978 obstack_init (&frame_cache_obstack
);
980 current_frame
= NULL
; /* Invalidate cache */
982 annotate_frames_invalid ();
985 /* Flush the frame cache, and start a new one if necessary. */
988 reinit_frame_cache (void)
990 flush_cached_frames ();
992 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
993 if (PIDGET (inferior_ptid
) != 0)
995 select_frame (get_current_frame ());
999 /* Create the previous frame using the deprecated methods
1000 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1002 static struct frame_info
*
1003 legacy_get_prev_frame (struct frame_info
*next_frame
)
1005 CORE_ADDR address
= 0;
1006 struct frame_info
*prev
;
1009 /* This code only works on normal frames. A sentinel frame, where
1010 the level is -1, should never reach this code. */
1011 gdb_assert (next_frame
->level
>= 0);
1013 /* On some machines it is possible to call a function without
1014 setting up a stack frame for it. On these machines, we
1015 define this macro to take two args; a frameinfo pointer
1016 identifying a frame and a variable to set or clear if it is
1017 or isn't leafless. */
1019 /* Still don't want to worry about this except on the innermost
1020 frame. This macro will set FROMLEAF if NEXT_FRAME is a frameless
1021 function invocation. */
1022 if (next_frame
->level
== 0)
1023 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1024 the frame chain, not just the inner most frame! The generic,
1025 per-architecture, frame code should handle this and the below
1026 should simply be removed. */
1027 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (next_frame
);
1032 /* A frameless inner-most frame. The `FP' (which isn't an
1033 architecture frame-pointer register!) of the caller is the same
1035 /* FIXME: 2002-11-09: There isn't any reason to special case this
1036 edge condition. Instead the per-architecture code should hande
1038 address
= get_frame_base (next_frame
);
1041 /* Two macros defined in tm.h specify the machine-dependent
1042 actions to be performed here.
1044 First, get the frame's chain-pointer.
1046 If that is zero, the frame is the outermost frame or a leaf
1047 called by the outermost frame. This means that if start
1048 calls main without a frame, we'll return 0 (which is fine
1051 Nope; there's a problem. This also returns when the current
1052 routine is a leaf of main. This is unacceptable. We move
1053 this to after the ffi test; I'd rather have backtraces from
1054 start go curfluy than have an abort called from main not show
1056 gdb_assert (FRAME_CHAIN_P ());
1057 address
= FRAME_CHAIN (next_frame
);
1059 if (!frame_chain_valid (address
, next_frame
))
1065 /* Create an initially zero previous frame. */
1066 prev
= frame_obstack_zalloc (sizeof (struct frame_info
));
1069 next_frame
->prev
= prev
;
1070 prev
->next
= next_frame
;
1071 prev
->frame
= address
;
1072 prev
->level
= next_frame
->level
+ 1;
1073 /* FIXME: cagney/2002-11-18: Should be setting the frame's type
1074 here, before anything else, and not last. Various INIT functions
1075 are full of work-arounds for the frames type not being set
1076 correctly from the word go. Ulgh! */
1077 prev
->type
= NORMAL_FRAME
;
1079 /* This change should not be needed, FIXME! We should determine
1080 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1081 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1082 way to express what goes on here.
1084 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1085 create_new_frame (where the PC is already set up) and here (where
1086 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1087 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1089 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1090 requires the PC value (which hasn't been set yet). Some other
1091 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1092 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1094 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1095 complication to an already overcomplicated part of GDB.
1096 gnu@cygnus.com, 15Sep92.
1098 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1099 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1101 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1102 (read_fp ()), read_pc ()). Machines with extra frame info would
1103 do that (or the local equivalent) and then set the extra fields.
1105 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1106 create_new_frame would no longer init extra frame info;
1107 SETUP_ARBITRARY_FRAME would have to do that.
1109 INIT_PREV_FRAME(fromleaf, prev) Replace
1110 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1111 This should also return a flag saying whether to keep the new
1112 frame, or whether to discard it, because on some machines (e.g.
1113 mips) it is really awkward to have FRAME_CHAIN_VALID called
1114 BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good way to
1115 get information deduced in FRAME_CHAIN_VALID into the extra
1116 fields of the new frame). std_frame_pc(fromleaf, prev)
1118 This is the default setting for INIT_PREV_FRAME. It just does
1119 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1120 will call it from INIT_PREV_FRAME (either at the beginning, the
1121 end, or in the middle). Some machines won't use it.
1123 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1125 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1126 reason for things to be this complicated.
1128 The trick is to assume that there is always a frame. Instead of
1129 special casing the inner-most frame, create fake frame
1130 (containing the hardware registers) that is inner to the
1131 user-visible inner-most frame (...) and then unwind from that.
1132 That way architecture code can use use the standard
1133 frame_XX_unwind() functions and not differentiate between the
1134 inner most and any other case.
1136 Since there is always a frame to unwind from, there is always
1137 somewhere (NEXT_FRAME) to store all the info needed to construct
1138 a new (previous) frame without having to first create it. This
1139 means that the convolution below - needing to carefully order a
1140 frame's initialization - isn't needed.
1142 The irony here though, is that FRAME_CHAIN(), at least for a more
1143 up-to-date architecture, always calls FRAME_SAVED_PC(), and
1144 FRAME_SAVED_PC() computes the PC but without first needing the
1145 frame! Instead of the convolution below, we could have simply
1146 called FRAME_SAVED_PC() and been done with it! Note that
1147 FRAME_SAVED_PC() is being superseed by frame_pc_unwind() and that
1148 function does have somewhere to cache that PC value. */
1150 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1151 prev
->pc
= (DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
, prev
));
1153 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1154 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1156 /* This entry is in the frame queue now, which is good since
1157 FRAME_SAVED_PC may use that queue to figure out its value (see
1158 tm-sparc.h). We want the pc saved in the inferior frame. */
1159 if (DEPRECATED_INIT_FRAME_PC_P ())
1160 prev
->pc
= DEPRECATED_INIT_FRAME_PC (fromleaf
, prev
);
1162 /* If ->frame and ->pc are unchanged, we are in the process of
1163 getting ourselves into an infinite backtrace. Some architectures
1164 check this in FRAME_CHAIN or thereabouts, but it seems like there
1165 is no reason this can't be an architecture-independent check. */
1166 if (prev
->frame
== next_frame
->frame
1167 && prev
->pc
== next_frame
->pc
)
1169 next_frame
->prev
= NULL
;
1170 obstack_free (&frame_cache_obstack
, prev
);
1174 /* Initialize the code used to unwind the frame PREV based on the PC
1175 (and probably other architectural information). The PC lets you
1176 check things like the debug info at that point (dwarf2cfi?) and
1177 use that to decide how the frame should be unwound. */
1178 prev
->unwind
= frame_unwind_find_by_pc (current_gdbarch
, prev
->pc
);
1180 /* NOTE: cagney/2002-11-18: The code segments, found in
1181 create_new_frame and get_prev_frame(), that initializes the
1182 frames type is subtly different. The latter only updates ->type
1183 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1184 get_prev_frame() overriding the frame's type when the INIT code
1185 has previously set it. This is really somewhat bogus. The
1186 initialization, as seen in create_new_frame(), should occur
1187 before the INIT function has been called. */
1188 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1189 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1190 ? DEPRECATED_PC_IN_CALL_DUMMY (prev
->pc
, 0, 0)
1191 : pc_in_dummy_frame (prev
->pc
)))
1192 prev
->type
= DUMMY_FRAME
;
1195 /* FIXME: cagney/2002-11-10: This should be moved to before the
1196 INIT code above so that the INIT code knows what the frame's
1197 type is (in fact, for a [generic] dummy-frame, the type can
1198 be set and then the entire initialization can be skipped.
1199 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1202 find_pc_partial_function (prev
->pc
, &name
, NULL
, NULL
);
1203 if (PC_IN_SIGTRAMP (prev
->pc
, name
))
1204 prev
->type
= SIGTRAMP_FRAME
;
1205 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1206 architectures are forcing the frame's type in INIT so we
1207 don't want to override it here. Remember, NORMAL_FRAME == 0,
1208 so it all works (just :-/). Once this initialization is
1209 moved to the start of this function, all this nastness will
1216 /* Return a structure containing various interesting information
1217 about the frame that called NEXT_FRAME. Returns NULL
1218 if there is no such frame. */
1221 get_prev_frame (struct frame_info
*next_frame
)
1223 struct frame_info
*prev_frame
;
1225 /* Return the inner-most frame, when the caller passes in NULL. */
1226 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1227 caller should have previously obtained a valid frame using
1228 get_selected_frame() and then called this code - only possibility
1229 I can think of is code behaving badly.
1231 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1232 block_innermost_frame(). It does the sequence: frame = NULL;
1233 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1234 it couldn't be written better, I don't know.
1236 NOTE: cagney/2003-01-11: I suspect what is happening is
1237 block_innermost_frame() is, when the target has no state
1238 (registers, memory, ...), still calling this function. The
1239 assumption being that this function will return NULL indicating
1240 that a frame isn't possible, rather than checking that the target
1241 has state and then calling get_current_frame() and
1242 get_prev_frame(). This is a guess mind. */
1243 if (next_frame
== NULL
)
1245 /* NOTE: cagney/2002-11-09: There was a code segment here that
1246 would error out when CURRENT_FRAME was NULL. The comment
1247 that went with it made the claim ...
1249 ``This screws value_of_variable, which just wants a nice
1250 clean NULL return from block_innermost_frame if there are no
1251 frames. I don't think I've ever seen this message happen
1252 otherwise. And returning NULL here is a perfectly legitimate
1255 Per the above, this code shouldn't even be called with a NULL
1257 return current_frame
;
1260 /* There is always a frame. If this assertion fails, suspect that
1261 something should be calling get_selected_frame() or
1262 get_current_frame(). */
1263 gdb_assert (next_frame
!= NULL
);
1265 if (next_frame
->level
>= 0
1266 && !backtrace_below_main
1267 && inside_main_func (get_frame_pc (next_frame
)))
1268 /* Don't unwind past main(), bug always unwind the sentinel frame.
1269 Note, this is done _before_ the frame has been marked as
1270 previously unwound. That way if the user later decides to
1271 allow unwinds past main(), that just happens. */
1274 fprintf_unfiltered (gdb_stdlog
,
1275 "Outermost frame - inside main func.\n");
1279 /* Only try to do the unwind once. */
1280 if (next_frame
->prev_p
)
1281 return next_frame
->prev
;
1282 next_frame
->prev_p
= 1;
1284 /* If we're inside the entry file, it isn't valid. Don't apply this
1285 test to a dummy frame - dummy frame PC's typically land in the
1286 entry file. Don't apply this test to the sentinel frame.
1287 Sentinel frames should always be allowed to unwind. */
1288 /* NOTE: drow/2002-12-25: should there be a way to disable this
1289 check? It assumes a single small entry file, and the way some
1290 debug readers (e.g. dbxread) figure out which object is the
1291 entry file is somewhat hokey. */
1292 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1293 then it should probably be moved to before the ->prev_p test,
1295 if (next_frame
->type
!= DUMMY_FRAME
&& next_frame
->level
>= 0
1296 && inside_entry_file (get_frame_pc (next_frame
)))
1299 fprintf_unfiltered (gdb_stdlog
,
1300 "Outermost frame - inside entry file\n");
1304 /* If we're already inside the entry function for the main objfile,
1305 then it isn't valid. Don't apply this test to a dummy frame -
1306 dummy frame PC's typically land in the entry func. Don't apply
1307 this test to the sentinel frame. Sentinel frames should always
1308 be allowed to unwind. */
1309 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1310 hard evidence that this is needed. */
1312 && next_frame
->type
!= DUMMY_FRAME
&& next_frame
->level
>= 0
1313 && inside_entry_func (get_frame_pc (next_frame
)))
1316 fprintf_unfiltered (gdb_stdlog
,
1317 "Outermost frame - inside entry func\n");
1321 /* If any of the old frame initialization methods are around, use
1322 the legacy get_prev_frame method. Just don't try to unwind a
1323 sentinel frame using that method - it doesn't work. All sentinal
1324 frames use the new unwind code. */
1325 if ((DEPRECATED_INIT_FRAME_PC_P ()
1326 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
1327 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
1328 || FRAME_CHAIN_P ())
1329 && next_frame
->level
>= 0)
1331 prev_frame
= legacy_get_prev_frame (next_frame
);
1332 if (frame_debug
&& prev_frame
== NULL
)
1333 fprintf_unfiltered (gdb_stdlog
,
1334 "Outermost frame - legacy_get_prev_frame NULL.\n");
1338 /* Allocate the new frame but do not wire it in to the frame chain.
1339 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1340 frame->next to pull some fancy tricks (of course such code is, by
1341 definition, recursive). Try to prevent it.
1343 There is no reason to worry about memory leaks, should the
1344 remainder of the function fail. The allocated memory will be
1345 quickly reclaimed when the frame cache is flushed, and the `we've
1346 been here before' check above will stop repeated memory
1347 allocation calls. */
1348 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1349 prev_frame
->level
= next_frame
->level
+ 1;
1351 /* Try to unwind the PC. If that doesn't work, assume we've reached
1352 the oldest frame and simply return. Is there a better sentinal
1353 value? The unwound PC value is then used to initialize the new
1354 previous frame's type.
1356 Note that the pc-unwind is intentionally performed before the
1357 frame chain. This is ok since, for old targets, both
1358 frame_pc_unwind (nee, FRAME_SAVED_PC) and FRAME_CHAIN()) assume
1359 NEXT_FRAME's data structures have already been initialized (using
1360 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1363 By unwinding the PC first, it becomes possible to, in the case of
1364 a dummy frame, avoid also unwinding the frame ID. This is
1365 because (well ignoring the PPC) a dummy frame can be located
1366 using NEXT_FRAME's frame ID. */
1368 prev_frame
->pc
= frame_pc_unwind (next_frame
);
1369 if (prev_frame
->pc
== 0)
1371 /* The allocated PREV_FRAME will be reclaimed when the frame
1372 obstack is next purged. */
1374 fprintf_unfiltered (gdb_stdlog
,
1375 "Outermost frame - unwound PC zero\n");
1378 prev_frame
->type
= frame_type_from_pc (prev_frame
->pc
);
1380 /* Set the unwind functions based on that identified PC. */
1381 prev_frame
->unwind
= frame_unwind_find_by_pc (current_gdbarch
,
1384 /* Find the prev's frame's ID. */
1385 switch (prev_frame
->type
)
1388 /* When unwinding a normal frame, the stack structure is
1389 determined by analyzing the frame's function's code (be it
1390 using brute force prologue analysis, or the dwarf2 CFI). In
1391 the case of a dummy frame, that simply isn't possible. The
1392 The PC is either the program entry point, or some random
1393 address on the stack. Trying to use that PC to apply
1394 standard frame ID unwind techniques is just asking for
1396 if (gdbarch_unwind_dummy_id_p (current_gdbarch
))
1398 /* Assume hand_function_call(), via SAVE_DUMMY_FRAME_TOS,
1399 previously saved the dummy frame's ID. Things only work
1400 if the two return the same value. */
1401 gdb_assert (SAVE_DUMMY_FRAME_TOS_P ());
1402 /* Use an architecture specific method to extract the prev's
1403 dummy ID from the next frame. Note that this method uses
1404 frame_register_unwind to obtain the register values
1405 needed to determine the dummy frame's ID. */
1406 prev_frame
->id
= gdbarch_unwind_dummy_id (current_gdbarch
,
1409 else if (next_frame
->level
< 0)
1411 /* We're unwinding a sentinel frame, the PC of which is
1412 pointing at a stack dummy. Fake up the dummy frame's ID
1413 using the same sequence as is found a traditional
1414 unwinder. Once all architectures supply the
1415 unwind_dummy_id method, this code can go away. */
1416 prev_frame
->id
.base
= read_fp ();
1417 prev_frame
->id
.pc
= read_pc ();
1421 /* Outch! We're not on the innermost frame yet we're trying
1422 to unwind to a dummy. The architecture must provide the
1423 unwind_dummy_id() method. Abandon the unwind process but
1424 only after first warning the user. */
1425 internal_warning (__FILE__
, __LINE__
,
1426 "Missing unwind_dummy_id architecture method");
1431 case SIGTRAMP_FRAME
:
1432 /* FIXME: cagney/2003-03-04: The below call isn't right. It
1433 should instead be doing something like "prev_frame -> unwind
1434 -> id (next_frame, & prev_frame -> unwind_cache, & prev_frame
1435 -> id)" but that requires more extensive (pending) changes. */
1436 next_frame
->unwind
->id (next_frame
, &next_frame
->unwind_cache
,
1438 /* Check that the unwound ID is valid. */
1439 if (!frame_id_p (prev_frame
->id
))
1442 fprintf_unfiltered (gdb_stdlog
,
1443 "Outermost frame - unwound frame ID invalid\n");
1446 /* Check that the new frame isn't inner to (younger, below,
1447 next) the old frame. If that happens the frame unwind is
1449 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1450 that doesn't have a valid frame ID. Should instead set the
1451 sentinel frame's frame ID to a `sentinel'. Leave it until
1452 after the switch to storing the frame ID, instead of the
1453 frame base, in the frame object. */
1454 if (next_frame
->level
>= 0
1455 && frame_id_inner (prev_frame
->id
, get_frame_id (next_frame
)))
1456 error ("Unwound frame inner-to selected frame (corrupt stack?)");
1457 /* Note that, due to frameless functions, the stronger test of
1458 the new frame being outer to the old frame can't be used -
1459 frameless functions differ by only their PC value. */
1462 internal_error (__FILE__
, __LINE__
, "bad switch");
1465 /* FIXME: cagney/2002-12-18: Instead of this hack, should only store
1466 the frame ID in PREV_FRAME. Unfortunatly, some architectures
1467 (HP/UX) still reply on EXTRA_FRAME_INFO and, hence, still poke at
1468 the "struct frame_info" object directly. */
1469 prev_frame
->frame
= prev_frame
->id
.base
;
1472 next_frame
->prev
= prev_frame
;
1473 prev_frame
->next
= next_frame
;
1475 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1476 initializing extra info, all frames will use the frame_cache
1477 (passed to the unwind functions) to store additional frame info.
1478 Unfortunatly legacy targets can't use legacy_get_prev_frame() to
1479 unwind the sentinel frame and, consequently, are forced to take
1480 this code path and rely on the below call to
1481 DEPRECATED_INIT_EXTRA_FRAME_INFO to initialize the inner-most
1483 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1485 gdb_assert (prev_frame
->level
== 0);
1486 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev_frame
);
1493 get_frame_pc (struct frame_info
*frame
)
1499 pc_notcurrent (struct frame_info
*frame
)
1501 /* If FRAME is not the innermost frame, that normally means that
1502 FRAME->pc points at the return instruction (which is *after* the
1503 call instruction), and we want to get the line containing the
1504 call (because the call is where the user thinks the program is).
1505 However, if the next frame is either a SIGTRAMP_FRAME or a
1506 DUMMY_FRAME, then the next frame will contain a saved interrupt
1507 PC and such a PC indicates the current (rather than next)
1508 instruction/line, consequently, for such cases, want to get the
1509 line containing fi->pc. */
1510 struct frame_info
*next
= get_next_frame (frame
);
1511 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
1516 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
1518 (*sal
) = find_pc_line (frame
->pc
, pc_notcurrent (frame
));
1521 /* Per "frame.h", return the ``address'' of the frame. Code should
1522 really be using get_frame_id(). */
1524 get_frame_base (struct frame_info
*fi
)
1529 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
1530 or -1 for a NULL frame. */
1533 frame_relative_level (struct frame_info
*fi
)
1542 get_frame_type (struct frame_info
*frame
)
1544 /* Some targets still don't use [generic] dummy frames. Catch them
1546 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1547 && deprecated_frame_in_dummy (frame
))
1553 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
1555 /* Arrrg! See comment in "frame.h". */
1559 #ifdef FRAME_FIND_SAVED_REGS
1560 /* XXX - deprecated. This is a compatibility function for targets
1561 that do not yet implement DEPRECATED_FRAME_INIT_SAVED_REGS. */
1562 /* Find the addresses in which registers are saved in FRAME. */
1565 deprecated_get_frame_saved_regs (struct frame_info
*frame
,
1566 struct frame_saved_regs
*saved_regs_addr
)
1568 if (frame
->saved_regs
== NULL
)
1570 frame
->saved_regs
= (CORE_ADDR
*)
1571 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
1573 if (saved_regs_addr
== NULL
)
1575 struct frame_saved_regs saved_regs
;
1576 FRAME_FIND_SAVED_REGS (frame
, saved_regs
);
1577 memcpy (frame
->saved_regs
, &saved_regs
, SIZEOF_FRAME_SAVED_REGS
);
1581 FRAME_FIND_SAVED_REGS (frame
, *saved_regs_addr
);
1582 memcpy (frame
->saved_regs
, saved_regs_addr
, SIZEOF_FRAME_SAVED_REGS
);
1587 struct frame_extra_info
*
1588 get_frame_extra_info (struct frame_info
*fi
)
1590 return fi
->extra_info
;
1593 struct frame_extra_info
*
1594 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
1596 fi
->extra_info
= frame_obstack_zalloc (size
);
1597 return fi
->extra_info
;
1601 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
1603 /* See comment in "frame.h". */
1605 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
1606 maintaining a locally allocated frame object. Since such frame's
1607 are not in the frame chain, it isn't possible to assume that the
1608 frame has a next. Sigh. */
1609 if (frame
->next
!= NULL
)
1611 /* While we're at it, update this frame's cached PC value, found
1612 in the next frame. Oh for the day when "struct frame_info"
1613 is opaque and this hack on hack can just go away. */
1614 frame
->next
->pc_unwind_cache
= pc
;
1615 frame
->next
->pc_unwind_cache_p
= 1;
1620 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
1622 /* See comment in "frame.h". */
1623 frame
->frame
= base
;
1627 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
1628 CORE_ADDR
*saved_regs
)
1630 frame
->saved_regs
= saved_regs
;
1634 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
1635 struct frame_extra_info
*extra_info
)
1637 frame
->extra_info
= extra_info
;
1641 deprecated_set_frame_next_hack (struct frame_info
*fi
,
1642 struct frame_info
*next
)
1648 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
1649 struct frame_info
*prev
)
1655 deprecated_get_frame_context (struct frame_info
*fi
)
1661 deprecated_set_frame_context (struct frame_info
*fi
,
1662 struct context
*context
)
1664 fi
->context
= context
;
1668 deprecated_frame_xmalloc (void)
1670 struct frame_info
*frame
= XMALLOC (struct frame_info
);
1671 memset (frame
, 0, sizeof (struct frame_info
));
1676 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
1677 long sizeof_extra_info
)
1679 struct frame_info
*frame
= deprecated_frame_xmalloc ();
1680 make_cleanup (xfree
, frame
);
1681 if (sizeof_saved_regs
> 0)
1683 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
1684 make_cleanup (xfree
, frame
->saved_regs
);
1686 if (sizeof_extra_info
> 0)
1688 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
1689 make_cleanup (xfree
, frame
->extra_info
);
1695 _initialize_frame (void)
1697 obstack_init (&frame_cache_obstack
);
1699 /* FIXME: cagney/2003-01-19: This command needs a rename. Suggest
1700 `set backtrace {past,beyond,...}-main'. Also suggest adding `set
1701 backtrace ...-start' to control backtraces past start. The
1702 problem with `below' is that it stops the `up' command. */
1704 add_setshow_boolean_cmd ("backtrace-below-main", class_obscure
,
1705 &backtrace_below_main
, "\
1706 Set whether backtraces should continue past \"main\".\n\
1707 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1708 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1709 of the stack trace.", "\
1710 Show whether backtraces should continue past \"main\".\n\
1711 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
1712 the backtrace at \"main\". Set this variable if you need to see the rest\n\
1713 of the stack trace.",
1714 NULL
, NULL
, &setlist
, &showlist
);
1717 /* Debug this files internals. */
1718 add_show_from_set (add_set_cmd ("frame", class_maintenance
, var_zinteger
,
1719 &frame_debug
, "Set frame debugging.\n\
1720 When non-zero, frame specific internal debugging is enabled.", &setdebuglist
),