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 "user-regs.h"
32 #include "gdb_obstack.h"
33 #include "dummy-frame.h"
34 #include "sentinel-frame.h"
38 #include "frame-unwind.h"
39 #include "frame-base.h"
43 /* We keep a cache of stack frames, each of which is a "struct
44 frame_info". The innermost one gets allocated (in
45 wait_for_inferior) each time the inferior stops; current_frame
46 points to it. Additional frames get allocated (in get_prev_frame)
47 as needed, and are chained through the next and prev fields. Any
48 time that the frame cache becomes invalid (most notably when we
49 execute something, but also if we change how we interpret the
50 frames (e.g. "set heuristic-fence-post" in mips-tdep.c, or anything
51 which reads new symbols)), we should call reinit_frame_cache. */
55 /* Level of this frame. The inner-most (youngest) frame is at level
56 0. As you move towards the outer-most (oldest) frame, the level
57 increases. This is a cached value. It could just as easily be
58 computed by counting back from the selected frame to the inner
60 /* NOTE: cagney/2002-04-05: Perhaphs a level of ``-1'' should be
61 reserved to indicate a bogus frame - one that has been created
62 just to keep GDB happy (GDB always needs a frame). For the
63 moment leave this as speculation. */
66 /* The frame's type. */
67 /* FIXME: cagney/2003-04-02: Should instead be returning
68 ->unwind->type. Unfortunatly, legacy code is still explicitly
69 setting the type using the method deprecated_set_frame_type.
70 Eliminate that method and this field can be eliminated. */
73 /* For each register, address of where it was saved on entry to the
74 frame, or zero if it was not saved on entry to this frame. This
75 includes special registers such as pc and fp saved in special
76 ways in the stack frame. The SP_REGNUM is even more special, the
77 address here is the sp for the previous frame, not the address
78 where the sp was saved. */
79 /* Allocated by frame_saved_regs_zalloc () which is called /
80 initialized by DEPRECATED_FRAME_INIT_SAVED_REGS(). */
81 CORE_ADDR
*saved_regs
; /*NUM_REGS + NUM_PSEUDO_REGS*/
83 /* Anything extra for this structure that may have been defined in
84 the machine dependent files. */
85 /* Allocated by frame_extra_info_zalloc () which is called /
86 initialized by DEPRECATED_INIT_EXTRA_FRAME_INFO */
87 struct frame_extra_info
*extra_info
;
89 /* If dwarf2 unwind frame informations is used, this structure holds
90 all related unwind data. */
91 struct context
*context
;
93 /* The frame's low-level unwinder and corresponding cache. The
94 low-level unwinder is responsible for unwinding register values
95 for the previous frame. The low-level unwind methods are
96 selected based on the presence, or otherwize, of register unwind
97 information such as CFI. */
99 const struct frame_unwind
*unwind
;
101 /* Cached copy of the previous frame's resume address. */
107 /* Cached copy of the previous frame's function address. */
114 /* This frame's ID. */
118 struct frame_id value
;
121 /* The frame's high-level base methods, and corresponding cache.
122 The high level base methods are selected based on the frame's
124 const struct frame_base
*base
;
127 /* Pointers to the next (down, inner, younger) and previous (up,
128 outer, older) frame_info's in the frame cache. */
129 struct frame_info
*next
; /* down, inner, younger */
131 struct frame_info
*prev
; /* up, outer, older */
134 /* Flag to control debugging. */
136 static int frame_debug
;
138 /* Flag to indicate whether backtraces should stop at main et.al. */
140 static int backtrace_past_main
;
141 static unsigned int backtrace_limit
= UINT_MAX
;
145 fprint_frame_id (struct ui_file
*file
, struct frame_id id
)
147 fprintf_unfiltered (file
, "{stack=0x%s,code=0x%s}",
148 paddr_nz (id
.stack_addr
),
149 paddr_nz (id
.code_addr
));
153 fprint_frame_type (struct ui_file
*file
, enum frame_type type
)
158 fprintf_unfiltered (file
, "UNKNOWN_FRAME");
161 fprintf_unfiltered (file
, "NORMAL_FRAME");
164 fprintf_unfiltered (file
, "DUMMY_FRAME");
167 fprintf_unfiltered (file
, "SIGTRAMP_FRAME");
170 fprintf_unfiltered (file
, "<unknown type>");
176 fprint_frame (struct ui_file
*file
, struct frame_info
*fi
)
180 fprintf_unfiltered (file
, "<NULL frame>");
183 fprintf_unfiltered (file
, "{");
184 fprintf_unfiltered (file
, "level=%d", fi
->level
);
185 fprintf_unfiltered (file
, ",");
186 fprintf_unfiltered (file
, "type=");
187 fprint_frame_type (file
, fi
->type
);
188 fprintf_unfiltered (file
, ",");
189 fprintf_unfiltered (file
, "unwind=");
190 if (fi
->unwind
!= NULL
)
191 gdb_print_host_address (fi
->unwind
, file
);
193 fprintf_unfiltered (file
, "<unknown>");
194 fprintf_unfiltered (file
, ",");
195 fprintf_unfiltered (file
, "pc=");
196 if (fi
->next
!= NULL
&& fi
->next
->prev_pc
.p
)
197 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_pc
.value
));
199 fprintf_unfiltered (file
, "<unknown>");
200 fprintf_unfiltered (file
, ",");
201 fprintf_unfiltered (file
, "id=");
203 fprint_frame_id (file
, fi
->this_id
.value
);
205 fprintf_unfiltered (file
, "<unknown>");
206 fprintf_unfiltered (file
, ",");
207 fprintf_unfiltered (file
, "func=");
208 if (fi
->next
!= NULL
&& fi
->next
->prev_func
.p
)
209 fprintf_unfiltered (file
, "0x%s", paddr_nz (fi
->next
->prev_func
.addr
));
211 fprintf_unfiltered (file
, "<unknown>");
212 fprintf_unfiltered (file
, "}");
215 /* Return a frame uniq ID that can be used to, later, re-find the
219 get_frame_id (struct frame_info
*fi
)
223 return null_frame_id
;
227 gdb_assert (!legacy_frame_p (current_gdbarch
));
229 fprintf_unfiltered (gdb_stdlog
, "{ get_frame_id (fi=%d) ",
231 /* Find the unwinder. */
232 if (fi
->unwind
== NULL
)
234 fi
->unwind
= frame_unwind_find_by_frame (fi
->next
);
235 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
236 type in the frame, the unwinder's type should be returned
237 directly. Unfortunatly, legacy code, called by
238 legacy_get_prev_frame, explicitly set the frames type
239 using the method deprecated_set_frame_type(). */
240 gdb_assert (fi
->unwind
->type
!= UNKNOWN_FRAME
);
241 fi
->type
= fi
->unwind
->type
;
243 /* Find THIS frame's ID. */
244 fi
->unwind
->this_id (fi
->next
, &fi
->prologue_cache
, &fi
->this_id
.value
);
248 fprintf_unfiltered (gdb_stdlog
, "-> ");
249 fprint_frame_id (gdb_stdlog
, fi
->this_id
.value
);
250 fprintf_unfiltered (gdb_stdlog
, " }\n");
253 return fi
->this_id
.value
;
256 const struct frame_id null_frame_id
; /* All zeros. */
259 frame_id_build (CORE_ADDR stack_addr
, CORE_ADDR code_addr
)
262 id
.stack_addr
= stack_addr
;
263 id
.code_addr
= code_addr
;
268 frame_id_p (struct frame_id l
)
271 /* The .code can be NULL but the .stack cannot. */
272 p
= (l
.stack_addr
!= 0);
275 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_p (l=");
276 fprint_frame_id (gdb_stdlog
, l
);
277 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", p
);
283 frame_id_eq (struct frame_id l
, struct frame_id r
)
286 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
287 /* Like a NaN, if either ID is invalid, the result is false. */
289 else if (l
.stack_addr
!= r
.stack_addr
)
290 /* If .stack addresses are different, the frames are different. */
292 else if (l
.code_addr
== 0 || r
.code_addr
== 0)
293 /* A zero code addr is a wild card, always succeed. */
295 else if (l
.code_addr
== r
.code_addr
)
296 /* The .stack and .code are identical, the ID's are identical. */
303 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_eq (l=");
304 fprint_frame_id (gdb_stdlog
, l
);
305 fprintf_unfiltered (gdb_stdlog
, ",r=");
306 fprint_frame_id (gdb_stdlog
, r
);
307 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", eq
);
313 frame_id_inner (struct frame_id l
, struct frame_id r
)
316 if (l
.stack_addr
== 0 || r
.stack_addr
== 0)
317 /* Like NaN, any operation involving an invalid ID always fails. */
320 /* Only return non-zero when strictly inner than. Note that, per
321 comment in "frame.h", there is some fuzz here. Frameless
322 functions are not strictly inner than (same .stack but
324 inner
= INNER_THAN (l
.stack_addr
, r
.stack_addr
);
327 fprintf_unfiltered (gdb_stdlog
, "{ frame_id_inner (l=");
328 fprint_frame_id (gdb_stdlog
, l
);
329 fprintf_unfiltered (gdb_stdlog
, ",r=");
330 fprint_frame_id (gdb_stdlog
, r
);
331 fprintf_unfiltered (gdb_stdlog
, ") -> %d }\n", inner
);
337 frame_find_by_id (struct frame_id id
)
339 struct frame_info
*frame
;
341 /* ZERO denotes the null frame, let the caller decide what to do
342 about it. Should it instead return get_current_frame()? */
343 if (!frame_id_p (id
))
346 for (frame
= get_current_frame ();
348 frame
= get_prev_frame (frame
))
350 struct frame_id
this = get_frame_id (frame
);
351 if (frame_id_eq (id
, this))
352 /* An exact match. */
354 if (frame_id_inner (id
, this))
357 /* Either, we're not yet gone far enough out along the frame
358 chain (inner(this,id), or we're comparing frameless functions
359 (same .base, different .func, no test available). Struggle
360 on until we've definitly gone to far. */
366 frame_pc_unwind (struct frame_info
*this_frame
)
368 if (!this_frame
->prev_pc
.p
)
371 if (gdbarch_unwind_pc_p (current_gdbarch
))
373 /* The right way. The `pure' way. The one true way. This
374 method depends solely on the register-unwind code to
375 determine the value of registers in THIS frame, and hence
376 the value of this frame's PC (resume address). A typical
377 implementation is no more than:
379 frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
380 return extract_unsigned_integer (buf, size of ISA_PC_REGNUM);
382 Note: this method is very heavily dependent on a correct
383 register-unwind implementation, it pays to fix that
384 method first; this method is frame type agnostic, since
385 it only deals with register values, it works with any
386 frame. This is all in stark contrast to the old
387 FRAME_SAVED_PC which would try to directly handle all the
388 different ways that a PC could be unwound. */
389 pc
= gdbarch_unwind_pc (current_gdbarch
, this_frame
);
391 else if (this_frame
->level
< 0)
393 /* FIXME: cagney/2003-03-06: Old code and and a sentinel
394 frame. Do like was always done. Fetch the PC's value
395 direct from the global registers array (via read_pc).
396 This assumes that this frame belongs to the current
397 global register cache. The assumption is dangerous. */
400 else if (DEPRECATED_FRAME_SAVED_PC_P ())
402 /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
403 frame. Do like was always done. Note that this method,
404 unlike unwind_pc(), tries to handle all the different
405 frame cases directly. It fails. */
406 pc
= DEPRECATED_FRAME_SAVED_PC (this_frame
);
409 internal_error (__FILE__
, __LINE__
, "No gdbarch_unwind_pc method");
410 this_frame
->prev_pc
.value
= pc
;
411 this_frame
->prev_pc
.p
= 1;
413 fprintf_unfiltered (gdb_stdlog
,
414 "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n",
416 paddr_nz (this_frame
->prev_pc
.value
));
418 return this_frame
->prev_pc
.value
;
422 frame_func_unwind (struct frame_info
*fi
)
424 if (!fi
->prev_func
.p
)
426 /* Make certain that this, and not the adjacent, function is
428 CORE_ADDR addr_in_block
= frame_unwind_address_in_block (fi
);
430 fi
->prev_func
.addr
= get_pc_function_start (addr_in_block
);
432 fprintf_unfiltered (gdb_stdlog
,
433 "{ frame_func_unwind (fi=%d) -> 0x%s }\n",
434 fi
->level
, paddr_nz (fi
->prev_func
.addr
));
436 return fi
->prev_func
.addr
;
440 get_frame_func (struct frame_info
*fi
)
442 return frame_func_unwind (fi
->next
);
446 do_frame_unwind_register (void *src
, int regnum
, void *buf
)
448 frame_unwind_register (src
, regnum
, buf
);
453 frame_pop (struct frame_info
*this_frame
)
455 struct regcache
*scratch_regcache
;
456 struct cleanup
*cleanups
;
458 if (DEPRECATED_POP_FRAME_P ())
460 /* A legacy architecture that has implemented a custom pop
461 function. All new architectures should instead be using the
462 generic code below. */
463 DEPRECATED_POP_FRAME
;
467 /* Make a copy of all the register values unwound from this
468 frame. Save them in a scratch buffer so that there isn't a
469 race betweening trying to extract the old values from the
470 current_regcache while, at the same time writing new values
471 into that same cache. */
472 struct regcache
*scratch
= regcache_xmalloc (current_gdbarch
);
473 struct cleanup
*cleanups
= make_cleanup_regcache_xfree (scratch
);
474 regcache_save (scratch
, do_frame_unwind_register
, this_frame
);
475 /* FIXME: cagney/2003-03-16: It should be possible to tell the
476 target's register cache that it is about to be hit with a
477 burst register transfer and that the sequence of register
478 writes should be batched. The pair target_prepare_to_store()
479 and target_store_registers() kind of suggest this
480 functionality. Unfortunatly, they don't implement it. Their
481 lack of a formal definition can lead to targets writing back
482 bogus values (arguably a bug in the target code mind). */
483 /* Now copy those saved registers into the current regcache.
484 Here, regcache_cpy() calls regcache_restore(). */
485 regcache_cpy (current_regcache
, scratch
);
486 do_cleanups (cleanups
);
488 /* We've made right mess of GDB's local state, just discard
490 flush_cached_frames ();
494 frame_register_unwind (struct frame_info
*frame
, int regnum
,
495 int *optimizedp
, enum lval_type
*lvalp
,
496 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
498 struct frame_unwind_cache
*cache
;
502 fprintf_unfiltered (gdb_stdlog
,
503 "{ frame_register_unwind (frame=%d,regnum=\"%s\",...) ",
504 frame
->level
, frame_map_regnum_to_name (frame
, regnum
));
507 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
508 that the value proper does not need to be fetched. */
509 gdb_assert (optimizedp
!= NULL
);
510 gdb_assert (lvalp
!= NULL
);
511 gdb_assert (addrp
!= NULL
);
512 gdb_assert (realnump
!= NULL
);
513 /* gdb_assert (bufferp != NULL); */
515 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
516 is broken. There is always a frame. If there, for some reason,
517 isn't, there is some pretty busted code as it should have
518 detected the problem before calling here. */
519 gdb_assert (frame
!= NULL
);
521 /* Find the unwinder. */
522 if (frame
->unwind
== NULL
)
524 frame
->unwind
= frame_unwind_find_by_frame (frame
->next
);
525 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
526 type in the frame, the unwinder's type should be returned
527 directly. Unfortunatly, legacy code, called by
528 legacy_get_prev_frame, explicitly set the frames type using
529 the method deprecated_set_frame_type(). */
530 gdb_assert (frame
->unwind
->type
!= UNKNOWN_FRAME
);
531 frame
->type
= frame
->unwind
->type
;
534 /* Ask this frame to unwind its register. See comment in
535 "frame-unwind.h" for why NEXT frame and this unwind cace are
537 frame
->unwind
->prev_register (frame
->next
, &frame
->prologue_cache
, regnum
,
538 optimizedp
, lvalp
, addrp
, realnump
, bufferp
);
542 fprintf_unfiltered (gdb_stdlog
, "->");
543 fprintf_unfiltered (gdb_stdlog
, " *optimizedp=%d", (*optimizedp
));
544 fprintf_unfiltered (gdb_stdlog
, " *lvalp=%d", (int) (*lvalp
));
545 fprintf_unfiltered (gdb_stdlog
, " *addrp=0x%s", paddr_nz ((*addrp
)));
546 fprintf_unfiltered (gdb_stdlog
, " *bufferp=");
548 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
552 const unsigned char *buf
= bufferp
;
553 fprintf_unfiltered (gdb_stdlog
, "[");
554 for (i
= 0; i
< register_size (current_gdbarch
, regnum
); i
++)
555 fprintf_unfiltered (gdb_stdlog
, "%02x", buf
[i
]);
556 fprintf_unfiltered (gdb_stdlog
, "]");
558 fprintf_unfiltered (gdb_stdlog
, " }\n");
563 frame_register (struct frame_info
*frame
, int regnum
,
564 int *optimizedp
, enum lval_type
*lvalp
,
565 CORE_ADDR
*addrp
, int *realnump
, void *bufferp
)
567 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
568 that the value proper does not need to be fetched. */
569 gdb_assert (optimizedp
!= NULL
);
570 gdb_assert (lvalp
!= NULL
);
571 gdb_assert (addrp
!= NULL
);
572 gdb_assert (realnump
!= NULL
);
573 /* gdb_assert (bufferp != NULL); */
575 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
576 of the register in the register cache. It should instead return
577 the REGNUM corresponding to that register. Translate the . */
578 if (DEPRECATED_GET_SAVED_REGISTER_P ())
580 DEPRECATED_GET_SAVED_REGISTER (bufferp
, optimizedp
, addrp
, frame
,
582 /* Compute the REALNUM if the caller wants it. */
583 if (*lvalp
== lval_register
)
586 for (regnum
= 0; regnum
< NUM_REGS
+ NUM_PSEUDO_REGS
; regnum
++)
588 if (*addrp
== register_offset_hack (current_gdbarch
, regnum
))
594 internal_error (__FILE__
, __LINE__
,
595 "Failed to compute the register number corresponding"
596 " to 0x%s", paddr_d (*addrp
));
602 /* Obtain the register value by unwinding the register from the next
603 (more inner frame). */
604 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
605 frame_register_unwind (frame
->next
, regnum
, optimizedp
, lvalp
, addrp
,
610 frame_unwind_register (struct frame_info
*frame
, int regnum
, void *buf
)
616 frame_register_unwind (frame
, regnum
, &optimized
, &lval
, &addr
,
621 get_frame_register (struct frame_info
*frame
,
622 int regnum
, void *buf
)
624 frame_unwind_register (frame
->next
, regnum
, buf
);
628 frame_unwind_register_signed (struct frame_info
*frame
, int regnum
)
630 char buf
[MAX_REGISTER_SIZE
];
631 frame_unwind_register (frame
, regnum
, buf
);
632 return extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
636 get_frame_register_signed (struct frame_info
*frame
, int regnum
)
638 return frame_unwind_register_signed (frame
->next
, regnum
);
642 frame_unwind_register_unsigned (struct frame_info
*frame
, int regnum
)
644 char buf
[MAX_REGISTER_SIZE
];
645 frame_unwind_register (frame
, regnum
, buf
);
646 return extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
650 get_frame_register_unsigned (struct frame_info
*frame
, int regnum
)
652 return frame_unwind_register_unsigned (frame
->next
, regnum
);
656 frame_unwind_signed_register (struct frame_info
*frame
, int regnum
,
659 char buf
[MAX_REGISTER_SIZE
];
660 frame_unwind_register (frame
, regnum
, buf
);
661 (*val
) = extract_signed_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
665 frame_unwind_unsigned_register (struct frame_info
*frame
, int regnum
,
668 char buf
[MAX_REGISTER_SIZE
];
669 frame_unwind_register (frame
, regnum
, buf
);
670 (*val
) = extract_unsigned_integer (buf
, REGISTER_VIRTUAL_SIZE (regnum
));
674 frame_read_register (struct frame_info
*frame
, int regnum
, void *buf
)
676 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
677 frame_unwind_register (frame
->next
, regnum
, buf
);
681 frame_read_unsigned_register (struct frame_info
*frame
, int regnum
,
684 /* NOTE: cagney/2002-10-31: There is a bit of dogma here - there is
685 always a frame. Both this, and the equivalent
686 frame_read_signed_register() function, can only be called with a
687 valid frame. If, for some reason, this function is called
688 without a frame then the problem isn't here, but rather in the
689 caller. It should of first created a frame and then passed that
691 /* NOTE: cagney/2002-10-31: As a side bar, keep in mind that the
692 ``current_frame'' should not be treated as a special case. While
693 ``get_next_frame (current_frame) == NULL'' currently holds, it
694 should, as far as possible, not be relied upon. In the future,
695 ``get_next_frame (current_frame)'' may instead simply return a
696 normal frame object that simply always gets register values from
697 the register cache. Consequently, frame code should try to avoid
698 tests like ``if get_next_frame() == NULL'' and instead just rely
699 on recursive frame calls (like the below code) when manipulating
701 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
702 frame_unwind_unsigned_register (frame
->next
, regnum
, val
);
706 frame_read_signed_register (struct frame_info
*frame
, int regnum
,
709 /* See note above in frame_read_unsigned_register(). */
710 gdb_assert (frame
!= NULL
&& frame
->next
!= NULL
);
711 frame_unwind_signed_register (frame
->next
, regnum
, val
);
715 put_frame_register (struct frame_info
*frame
, int regnum
, const void *buf
)
717 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
722 frame_register (frame
, regnum
, &optim
, &lval
, &addr
, &realnum
, NULL
);
724 error ("Attempt to assign to a value that was optimized out.");
729 /* FIXME: write_memory doesn't yet take constant buffers.
731 char tmp
[MAX_REGISTER_SIZE
];
732 memcpy (tmp
, buf
, register_size (gdbarch
, regnum
));
733 write_memory (addr
, tmp
, register_size (gdbarch
, regnum
));
737 regcache_cooked_write (current_regcache
, realnum
, buf
);
740 error ("Attempt to assign to an unmodifiable value.");
744 /* frame_register_read ()
746 Find and return the value of REGNUM for the specified stack frame.
747 The number of bytes copied is REGISTER_RAW_SIZE (REGNUM).
749 Returns 0 if the register value could not be found. */
752 frame_register_read (struct frame_info
*frame
, int regnum
, void *myaddr
)
758 frame_register (frame
, regnum
, &optimized
, &lval
, &addr
, &realnum
, myaddr
);
760 /* FIXME: cagney/2002-05-15: This test, is just bogus.
762 It indicates that the target failed to supply a value for a
763 register because it was "not available" at this time. Problem
764 is, the target still has the register and so get saved_register()
765 may be returning a value saved on the stack. */
767 if (register_cached (regnum
) < 0)
768 return 0; /* register value not available */
774 /* Map between a frame register number and its name. A frame register
775 space is a superset of the cooked register space --- it also
776 includes builtin registers. */
779 frame_map_name_to_regnum (struct frame_info
*frame
, const char *name
, int len
)
781 return user_reg_map_name_to_regnum (get_frame_arch (frame
), name
, len
);
785 frame_map_regnum_to_name (struct frame_info
*frame
, int regnum
)
787 return user_reg_map_regnum_to_name (get_frame_arch (frame
), regnum
);
790 /* Create a sentinel frame. */
792 static struct frame_info
*
793 create_sentinel_frame (struct regcache
*regcache
)
795 struct frame_info
*frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
796 frame
->type
= NORMAL_FRAME
;
798 /* Explicitly initialize the sentinel frame's cache. Provide it
799 with the underlying regcache. In the future additional
800 information, such as the frame's thread will be added. */
801 frame
->prologue_cache
= sentinel_frame_cache (regcache
);
802 /* For the moment there is only one sentinel frame implementation. */
803 frame
->unwind
= sentinel_frame_unwind
;
804 /* Link this frame back to itself. The frame is self referential
805 (the unwound PC is the same as the pc), so make it so. */
807 /* Make the sentinel frame's ID valid, but invalid. That way all
808 comparisons with it should fail. */
809 frame
->this_id
.p
= 1;
810 frame
->this_id
.value
= null_frame_id
;
813 fprintf_unfiltered (gdb_stdlog
, "{ create_sentinel_frame (...) -> ");
814 fprint_frame (gdb_stdlog
, frame
);
815 fprintf_unfiltered (gdb_stdlog
, " }\n");
820 /* Info about the innermost stack frame (contents of FP register) */
822 static struct frame_info
*current_frame
;
824 /* Cache for frame addresses already read by gdb. Valid only while
825 inferior is stopped. Control variables for the frame cache should
826 be local to this module. */
828 static struct obstack frame_cache_obstack
;
831 frame_obstack_zalloc (unsigned long size
)
833 void *data
= obstack_alloc (&frame_cache_obstack
, size
);
834 memset (data
, 0, size
);
839 frame_saved_regs_zalloc (struct frame_info
*fi
)
841 fi
->saved_regs
= (CORE_ADDR
*)
842 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS
);
843 return fi
->saved_regs
;
847 get_frame_saved_regs (struct frame_info
*fi
)
849 return fi
->saved_regs
;
852 /* Return the innermost (currently executing) stack frame. This is
853 split into two functions. The function unwind_to_current_frame()
854 is wrapped in catch exceptions so that, even when the unwind of the
855 sentinel frame fails, the function still returns a stack frame. */
858 unwind_to_current_frame (struct ui_out
*ui_out
, void *args
)
860 struct frame_info
*frame
= get_prev_frame (args
);
861 /* A sentinel frame can fail to unwind, eg, because it's PC value
862 lands in somewhere like start. */
865 current_frame
= frame
;
870 get_current_frame (void)
872 /* First check, and report, the lack of registers. Having GDB
873 report "No stack!" or "No memory" when the target doesn't even
874 have registers is very confusing. Besides, "printcmd.exp"
875 explicitly checks that ``print $pc'' with no registers prints "No
877 if (!target_has_registers
)
878 error ("No registers.");
879 if (!target_has_stack
)
881 if (!target_has_memory
)
882 error ("No memory.");
883 if (current_frame
== NULL
)
885 struct frame_info
*sentinel_frame
=
886 create_sentinel_frame (current_regcache
);
887 if (catch_exceptions (uiout
, unwind_to_current_frame
, sentinel_frame
,
888 NULL
, RETURN_MASK_ERROR
) != 0)
890 /* Oops! Fake a current frame? Is this useful? It has a PC
891 of zero, for instance. */
892 current_frame
= sentinel_frame
;
895 return current_frame
;
898 /* The "selected" stack frame is used by default for local and arg
899 access. May be zero, for no selected frame. */
901 struct frame_info
*deprecated_selected_frame
;
903 /* Return the selected frame. Always non-null (unless there isn't an
904 inferior sufficient for creating a frame) in which case an error is
908 get_selected_frame (void)
910 if (deprecated_selected_frame
== NULL
)
911 /* Hey! Don't trust this. It should really be re-finding the
912 last selected frame of the currently selected thread. This,
913 though, is better than nothing. */
914 select_frame (get_current_frame ());
915 /* There is always a frame. */
916 gdb_assert (deprecated_selected_frame
!= NULL
);
917 return deprecated_selected_frame
;
920 /* Select frame FI (or NULL - to invalidate the current frame). */
923 select_frame (struct frame_info
*fi
)
925 register struct symtab
*s
;
927 deprecated_selected_frame
= fi
;
928 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
929 frame is being invalidated. */
930 if (selected_frame_level_changed_hook
)
931 selected_frame_level_changed_hook (frame_relative_level (fi
));
933 /* FIXME: kseitz/2002-08-28: It would be nice to call
934 selected_frame_level_changed_event right here, but due to limitations
935 in the current interfaces, we would end up flooding UIs with events
936 because select_frame is used extensively internally.
938 Once we have frame-parameterized frame (and frame-related) commands,
939 the event notification can be moved here, since this function will only
940 be called when the users selected frame is being changed. */
942 /* Ensure that symbols for this frame are read in. Also, determine the
943 source language of this frame, and switch to it if desired. */
946 s
= find_pc_symtab (get_frame_pc (fi
));
948 && s
->language
!= current_language
->la_language
949 && s
->language
!= language_unknown
950 && language_mode
== language_mode_auto
)
952 set_language (s
->language
);
957 /* Return the register saved in the simplistic ``saved_regs'' cache.
958 If the value isn't here AND a value is needed, try the next inner
962 legacy_saved_regs_prev_register (struct frame_info
*next_frame
,
963 void **this_prologue_cache
,
964 int regnum
, int *optimizedp
,
965 enum lval_type
*lvalp
, CORE_ADDR
*addrp
,
966 int *realnump
, void *bufferp
)
968 /* HACK: New code is passed the next frame and this cache.
969 Unfortunatly, old code expects this frame. Since this is a
970 backward compatibility hack, cheat by walking one level along the
971 prologue chain to the frame the old code expects.
973 Do not try this at home. Professional driver, closed course. */
974 struct frame_info
*frame
= next_frame
->prev
;
975 gdb_assert (frame
!= NULL
);
977 if (get_frame_saved_regs (frame
) == NULL
)
979 /* If nothing's initialized the saved regs, do it now. */
980 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
981 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
982 gdb_assert (get_frame_saved_regs (frame
) != NULL
);
985 if (get_frame_saved_regs (frame
) != NULL
986 && get_frame_saved_regs (frame
)[regnum
] != 0)
988 if (regnum
== SP_REGNUM
)
990 /* SP register treated specially. */
996 /* NOTE: cagney/2003-05-09: In-lined store_address with
997 it's body - store_unsigned_integer. */
998 store_unsigned_integer (bufferp
, REGISTER_RAW_SIZE (regnum
),
999 get_frame_saved_regs (frame
)[regnum
]);
1003 /* Any other register is saved in memory, fetch it but cache
1004 a local copy of its value. */
1006 *lvalp
= lval_memory
;
1007 *addrp
= get_frame_saved_regs (frame
)[regnum
];
1009 if (bufferp
!= NULL
)
1012 /* Save each register value, as it is read in, in a
1013 frame based cache. */
1014 void **regs
= (*this_prologue_cache
);
1017 int sizeof_cache
= ((NUM_REGS
+ NUM_PSEUDO_REGS
)
1019 regs
= frame_obstack_zalloc (sizeof_cache
);
1020 (*this_prologue_cache
) = regs
;
1022 if (regs
[regnum
] == NULL
)
1025 = frame_obstack_zalloc (REGISTER_RAW_SIZE (regnum
));
1026 read_memory (get_frame_saved_regs (frame
)[regnum
], regs
[regnum
],
1027 REGISTER_RAW_SIZE (regnum
));
1029 memcpy (bufferp
, regs
[regnum
], REGISTER_RAW_SIZE (regnum
));
1031 /* Read the value in from memory. */
1032 read_memory (get_frame_saved_regs (frame
)[regnum
], bufferp
,
1033 REGISTER_RAW_SIZE (regnum
));
1040 /* No luck. Assume this and the next frame have the same register
1041 value. Pass the unwind request down the frame chain to the next
1042 frame. Hopefully that frame will find the register's location. */
1043 frame_register_unwind (next_frame
, regnum
, optimizedp
, lvalp
, addrp
,
1048 legacy_saved_regs_this_id (struct frame_info
*next_frame
,
1049 void **this_prologue_cache
,
1050 struct frame_id
*id
)
1052 /* legacy_get_prev_frame() always sets ->this_id.p, hence this is
1054 internal_error (__FILE__
, __LINE__
, "legacy_saved_regs_this_id() called");
1057 const struct frame_unwind legacy_saved_regs_unwinder
= {
1058 /* Not really. It gets overridden by legacy_get_prev_frame. */
1060 legacy_saved_regs_this_id
,
1061 legacy_saved_regs_prev_register
1063 const struct frame_unwind
*legacy_saved_regs_unwind
= &legacy_saved_regs_unwinder
;
1066 /* Function: deprecated_generic_get_saved_register
1067 Find register number REGNUM relative to FRAME and put its (raw,
1068 target format) contents in *RAW_BUFFER.
1070 Set *OPTIMIZED if the variable was optimized out (and thus can't be
1071 fetched). Note that this is never set to anything other than zero
1072 in this implementation.
1074 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
1075 whether the value was fetched from memory, from a register, or in a
1076 strange and non-modifiable way (e.g. a frame pointer which was
1077 calculated rather than fetched). We will use not_lval for values
1078 fetched from generic dummy frames.
1080 Set *ADDRP to the address, either in memory or as a REGISTER_BYTE
1081 offset into the registers array. If the value is stored in a dummy
1082 frame, set *ADDRP to zero.
1084 The argument RAW_BUFFER must point to aligned memory. */
1087 deprecated_generic_get_saved_register (char *raw_buffer
, int *optimized
,
1089 struct frame_info
*frame
, int regnum
,
1090 enum lval_type
*lval
)
1092 if (!target_has_registers
)
1093 error ("No registers.");
1095 /* Normal systems don't optimize out things with register numbers. */
1096 if (optimized
!= NULL
)
1099 if (addrp
) /* default assumption: not found in memory */
1102 /* Note: since the current frame's registers could only have been
1103 saved by frames INTERIOR TO the current frame, we skip examining
1104 the current frame itself: otherwise, we would be getting the
1105 previous frame's registers which were saved by the current frame. */
1109 for (frame
= get_next_frame (frame
);
1110 frame_relative_level (frame
) >= 0;
1111 frame
= get_next_frame (frame
))
1113 if (get_frame_type (frame
) == DUMMY_FRAME
)
1115 if (lval
) /* found it in a CALL_DUMMY frame */
1118 /* FIXME: cagney/2002-06-26: This should be via the
1119 gdbarch_register_read() method so that it, on the
1120 fly, constructs either a raw or pseudo register
1121 from the raw register cache. */
1123 (deprecated_find_dummy_frame_regcache (get_frame_pc (frame
),
1124 get_frame_base (frame
)),
1125 regnum
, raw_buffer
);
1129 DEPRECATED_FRAME_INIT_SAVED_REGS (frame
);
1130 if (get_frame_saved_regs (frame
) != NULL
1131 && get_frame_saved_regs (frame
)[regnum
] != 0)
1133 if (lval
) /* found it saved on the stack */
1134 *lval
= lval_memory
;
1135 if (regnum
== SP_REGNUM
)
1137 if (raw_buffer
) /* SP register treated specially */
1138 /* NOTE: cagney/2003-05-09: In-line store_address
1139 with it's body - store_unsigned_integer. */
1140 store_unsigned_integer (raw_buffer
,
1141 REGISTER_RAW_SIZE (regnum
),
1142 get_frame_saved_regs (frame
)[regnum
]);
1146 if (addrp
) /* any other register */
1147 *addrp
= get_frame_saved_regs (frame
)[regnum
];
1149 read_memory (get_frame_saved_regs (frame
)[regnum
], raw_buffer
,
1150 REGISTER_RAW_SIZE (regnum
));
1157 /* If we get thru the loop to this point, it means the register was
1158 not saved in any frame. Return the actual live-register value. */
1160 if (lval
) /* found it in a live register */
1161 *lval
= lval_register
;
1163 *addrp
= REGISTER_BYTE (regnum
);
1165 deprecated_read_register_gen (regnum
, raw_buffer
);
1168 /* Determine the frame's type based on its PC. */
1170 static enum frame_type
1171 frame_type_from_pc (CORE_ADDR pc
)
1173 /* FIXME: cagney/2002-11-24: Can't yet directly call
1174 pc_in_dummy_frame() as some architectures don't set
1175 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
1176 latter is implemented by simply calling pc_in_dummy_frame). */
1177 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1178 && DEPRECATED_PC_IN_CALL_DUMMY (pc
, 0, 0))
1183 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
1184 if (PC_IN_SIGTRAMP (pc
, name
))
1185 return SIGTRAMP_FRAME
;
1187 return NORMAL_FRAME
;
1191 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
1192 Always returns a non-NULL value. */
1195 create_new_frame (CORE_ADDR addr
, CORE_ADDR pc
)
1197 struct frame_info
*fi
;
1201 fprintf_unfiltered (gdb_stdlog
,
1202 "{ create_new_frame (addr=0x%s, pc=0x%s) ",
1203 paddr_nz (addr
), paddr_nz (pc
));
1206 fi
= frame_obstack_zalloc (sizeof (struct frame_info
));
1208 fi
->next
= create_sentinel_frame (current_regcache
);
1210 /* Select/initialize both the unwind function and the frame's type
1212 fi
->unwind
= frame_unwind_find_by_frame (fi
->next
);
1213 if (fi
->unwind
->type
!= UNKNOWN_FRAME
)
1214 fi
->type
= fi
->unwind
->type
;
1216 fi
->type
= frame_type_from_pc (pc
);
1219 deprecated_update_frame_base_hack (fi
, addr
);
1220 deprecated_update_frame_pc_hack (fi
, pc
);
1222 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1223 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi
);
1227 fprintf_unfiltered (gdb_stdlog
, "-> ");
1228 fprint_frame (gdb_stdlog
, fi
);
1229 fprintf_unfiltered (gdb_stdlog
, " }\n");
1235 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
1236 innermost frame). Be careful to not fall off the bottom of the
1237 frame chain and onto the sentinel frame. */
1240 get_next_frame (struct frame_info
*this_frame
)
1242 if (this_frame
->level
> 0)
1243 return this_frame
->next
;
1249 deprecated_get_next_frame_hack (struct frame_info
*this_frame
)
1251 return this_frame
->next
;
1254 /* Flush the entire frame cache. */
1257 flush_cached_frames (void)
1259 /* Since we can't really be sure what the first object allocated was */
1260 obstack_free (&frame_cache_obstack
, 0);
1261 obstack_init (&frame_cache_obstack
);
1263 current_frame
= NULL
; /* Invalidate cache */
1264 select_frame (NULL
);
1265 annotate_frames_invalid ();
1267 fprintf_unfiltered (gdb_stdlog
, "{ flush_cached_frames () }\n");
1270 /* Flush the frame cache, and start a new one if necessary. */
1273 reinit_frame_cache (void)
1275 flush_cached_frames ();
1277 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
1278 if (PIDGET (inferior_ptid
) != 0)
1280 select_frame (get_current_frame ());
1284 /* Create the previous frame using the deprecated methods
1285 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1287 static struct frame_info
*
1288 legacy_get_prev_frame (struct frame_info
*this_frame
)
1290 CORE_ADDR address
= 0;
1291 struct frame_info
*prev
;
1294 /* Don't frame_debug print legacy_get_prev_frame() here, just
1295 confuses the output. */
1297 /* Allocate the new frame.
1299 There is no reason to worry about memory leaks, should the
1300 remainder of the function fail. The allocated memory will be
1301 quickly reclaimed when the frame cache is flushed, and the `we've
1302 been here before' check, in get_prev_frame will stop repeated
1303 memory allocation calls. */
1304 prev
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1305 prev
->level
= this_frame
->level
+ 1;
1307 /* Do not completly wire it in to the frame chain. Some (bad) code
1308 in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
1309 some fancy tricks (of course such code is, by definition,
1312 On the other hand, methods, such as get_frame_pc() and
1313 get_frame_base() rely on being able to walk along the frame
1314 chain. Make certain that at least they work by providing that
1315 link. Of course things manipulating prev can't go back. */
1316 prev
->next
= this_frame
;
1318 /* NOTE: cagney/2002-11-18: Should have been correctly setting the
1319 frame's type here, before anything else, and not last, at the
1320 bottom of this function. The various
1321 DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
1322 DEPRECATED_INIT_FRAME_PC_FIRST and
1323 DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
1324 that handle the frame not being correctly set from the start.
1325 Unfortunatly those same work-arounds rely on the type defaulting
1326 to NORMAL_FRAME. Ulgh! The new frame code does not have this
1328 prev
->type
= UNKNOWN_FRAME
;
1330 /* A legacy frame's ID is always computed here. Mark it as valid. */
1331 prev
->this_id
.p
= 1;
1333 /* Handle sentinel frame unwind as a special case. */
1334 if (this_frame
->level
< 0)
1336 /* Try to unwind the PC. If that doesn't work, assume we've reached
1337 the oldest frame and simply return. Is there a better sentinal
1338 value? The unwound PC value is then used to initialize the new
1339 previous frame's type.
1341 Note that the pc-unwind is intentionally performed before the
1342 frame chain. This is ok since, for old targets, both
1343 frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
1344 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1345 have already been initialized (using
1346 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1349 By unwinding the PC first, it becomes possible to, in the case of
1350 a dummy frame, avoid also unwinding the frame ID. This is
1351 because (well ignoring the PPC) a dummy frame can be located
1352 using THIS_FRAME's frame ID. */
1354 deprecated_update_frame_pc_hack (prev
, frame_pc_unwind (this_frame
));
1355 if (get_frame_pc (prev
) == 0)
1357 /* The allocated PREV_FRAME will be reclaimed when the frame
1358 obstack is next purged. */
1361 fprintf_unfiltered (gdb_stdlog
, "-> ");
1362 fprint_frame (gdb_stdlog
, NULL
);
1363 fprintf_unfiltered (gdb_stdlog
,
1364 " // unwound legacy PC zero }\n");
1369 /* Set the unwind functions based on that identified PC. Ditto
1370 for the "type" but strongly prefer the unwinder's frame type. */
1371 prev
->unwind
= frame_unwind_find_by_frame (prev
->next
);
1372 if (prev
->unwind
->type
== UNKNOWN_FRAME
)
1373 prev
->type
= frame_type_from_pc (get_frame_pc (prev
));
1375 prev
->type
= prev
->unwind
->type
;
1377 /* Find the prev's frame's ID. */
1378 if (prev
->type
== DUMMY_FRAME
1379 && gdbarch_unwind_dummy_id_p (current_gdbarch
))
1381 /* When unwinding a normal frame, the stack structure is
1382 determined by analyzing the frame's function's code (be
1383 it using brute force prologue analysis, or the dwarf2
1384 CFI). In the case of a dummy frame, that simply isn't
1385 possible. The The PC is either the program entry point,
1386 or some random address on the stack. Trying to use that
1387 PC to apply standard frame ID unwind techniques is just
1388 asking for trouble. */
1389 /* Use an architecture specific method to extract the prev's
1390 dummy ID from the next frame. Note that this method uses
1391 frame_register_unwind to obtain the register values
1392 needed to determine the dummy frame's ID. */
1393 prev
->this_id
.value
= gdbarch_unwind_dummy_id (current_gdbarch
,
1398 /* We're unwinding a sentinel frame, the PC of which is
1399 pointing at a stack dummy. Fake up the dummy frame's ID
1400 using the same sequence as is found a traditional
1401 unwinder. Once all architectures supply the
1402 unwind_dummy_id method, this code can go away. */
1403 prev
->this_id
.value
= frame_id_build (deprecated_read_fp (),
1407 /* Check that the unwound ID is valid. */
1408 if (!frame_id_p (prev
->this_id
.value
))
1412 fprintf_unfiltered (gdb_stdlog
, "-> ");
1413 fprint_frame (gdb_stdlog
, NULL
);
1414 fprintf_unfiltered (gdb_stdlog
,
1415 " // unwound legacy ID invalid }\n");
1420 /* Check that the new frame isn't inner to (younger, below,
1421 next) the old frame. If that happens the frame unwind is
1423 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1424 that doesn't have a valid frame ID. Should instead set the
1425 sentinel frame's frame ID to a `sentinel'. Leave it until
1426 after the switch to storing the frame ID, instead of the
1427 frame base, in the frame object. */
1430 this_frame
->prev
= prev
;
1432 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1433 initializing extra info, all frames will use the frame_cache
1434 (passed to the unwind functions) to store additional frame
1435 info. Unfortunatly legacy targets can't use
1436 legacy_get_prev_frame() to unwind the sentinel frame and,
1437 consequently, are forced to take this code path and rely on
1438 the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
1439 initialize the inner-most frame. */
1440 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1442 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev
);
1445 if (prev
->type
== NORMAL_FRAME
)
1446 prev
->this_id
.value
.code_addr
1447 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1451 fprintf_unfiltered (gdb_stdlog
, "-> ");
1452 fprint_frame (gdb_stdlog
, prev
);
1453 fprintf_unfiltered (gdb_stdlog
, " } // legacy innermost frame\n");
1458 /* This code only works on normal frames. A sentinel frame, where
1459 the level is -1, should never reach this code. */
1460 gdb_assert (this_frame
->level
>= 0);
1462 /* On some machines it is possible to call a function without
1463 setting up a stack frame for it. On these machines, we
1464 define this macro to take two args; a frameinfo pointer
1465 identifying a frame and a variable to set or clear if it is
1466 or isn't leafless. */
1468 /* Still don't want to worry about this except on the innermost
1469 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1470 function invocation. */
1471 if (this_frame
->level
== 0)
1472 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1473 the frame chain, not just the inner most frame! The generic,
1474 per-architecture, frame code should handle this and the below
1475 should simply be removed. */
1476 fromleaf
= FRAMELESS_FUNCTION_INVOCATION (this_frame
);
1481 /* A frameless inner-most frame. The `FP' (which isn't an
1482 architecture frame-pointer register!) of the caller is the same
1484 /* FIXME: 2002-11-09: There isn't any reason to special case this
1485 edge condition. Instead the per-architecture code should hande
1487 /* FIXME: cagney/2003-06-16: This returns the inner most stack
1488 address for the previous frame, that, however, is wrong. It
1489 should be the inner most stack address for the previous to
1490 previous frame. This is because it is the previous to previous
1491 frame's innermost stack address that is constant through out
1492 the lifetime of the previous frame (trust me :-). */
1493 address
= get_frame_base (this_frame
);
1496 /* Two macros defined in tm.h specify the machine-dependent
1497 actions to be performed here.
1499 First, get the frame's chain-pointer.
1501 If that is zero, the frame is the outermost frame or a leaf
1502 called by the outermost frame. This means that if start
1503 calls main without a frame, we'll return 0 (which is fine
1506 Nope; there's a problem. This also returns when the current
1507 routine is a leaf of main. This is unacceptable. We move
1508 this to after the ffi test; I'd rather have backtraces from
1509 start go curfluy than have an abort called from main not show
1511 if (DEPRECATED_FRAME_CHAIN_P ())
1512 address
= DEPRECATED_FRAME_CHAIN (this_frame
);
1515 /* Someone is part way through coverting an old architecture
1516 to the new frame code. Implement FRAME_CHAIN the way the
1518 /* Find PREV frame's unwinder. */
1519 prev
->unwind
= frame_unwind_find_by_frame (this_frame
->next
);
1520 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
1521 type in the frame, the unwinder's type should be returned
1522 directly. Unfortunatly, legacy code, called by
1523 legacy_get_prev_frame, explicitly set the frames type
1524 using the method deprecated_set_frame_type(). */
1525 prev
->type
= prev
->unwind
->type
;
1526 /* Find PREV frame's ID. */
1527 prev
->unwind
->this_id (this_frame
,
1528 &prev
->prologue_cache
,
1529 &prev
->this_id
.value
);
1530 prev
->this_id
.p
= 1;
1531 address
= prev
->this_id
.value
.stack_addr
;
1534 if (!legacy_frame_chain_valid (address
, this_frame
))
1538 fprintf_unfiltered (gdb_stdlog
, "-> ");
1539 fprint_frame (gdb_stdlog
, NULL
);
1540 fprintf_unfiltered (gdb_stdlog
,
1541 " // legacy frame chain invalid }\n");
1550 fprintf_unfiltered (gdb_stdlog
, "-> ");
1551 fprint_frame (gdb_stdlog
, NULL
);
1552 fprintf_unfiltered (gdb_stdlog
,
1553 " // legacy frame chain NULL }\n");
1558 /* Link in the already allocated prev frame. */
1559 this_frame
->prev
= prev
;
1560 deprecated_update_frame_base_hack (prev
, address
);
1562 /* This change should not be needed, FIXME! We should determine
1563 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1564 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1565 way to express what goes on here.
1567 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1568 create_new_frame (where the PC is already set up) and here (where
1569 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1570 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1572 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1573 requires the PC value (which hasn't been set yet). Some other
1574 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1575 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1577 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1578 complication to an already overcomplicated part of GDB.
1579 gnu@cygnus.com, 15Sep92.
1581 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1582 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1584 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1585 (deprecated_read_fp ()), read_pc ()). Machines with extra frame
1586 info would do that (or the local equivalent) and then set the
1589 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1590 create_new_frame would no longer init extra frame info;
1591 SETUP_ARBITRARY_FRAME would have to do that.
1593 INIT_PREV_FRAME(fromleaf, prev) Replace
1594 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1595 This should also return a flag saying whether to keep the new
1596 frame, or whether to discard it, because on some machines (e.g.
1597 mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
1598 called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
1599 way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
1600 into the extra fields of the new frame). std_frame_pc(fromleaf,
1603 This is the default setting for INIT_PREV_FRAME. It just does
1604 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1605 will call it from INIT_PREV_FRAME (either at the beginning, the
1606 end, or in the middle). Some machines won't use it.
1608 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1610 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1611 reason for things to be this complicated.
1613 The trick is to assume that there is always a frame. Instead of
1614 special casing the inner-most frame, create fake frame
1615 (containing the hardware registers) that is inner to the
1616 user-visible inner-most frame (...) and then unwind from that.
1617 That way architecture code can use use the standard
1618 frame_XX_unwind() functions and not differentiate between the
1619 inner most and any other case.
1621 Since there is always a frame to unwind from, there is always
1622 somewhere (THIS_FRAME) to store all the info needed to construct
1623 a new (previous) frame without having to first create it. This
1624 means that the convolution below - needing to carefully order a
1625 frame's initialization - isn't needed.
1627 The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
1628 for a more up-to-date architecture, always calls
1629 FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
1630 without first needing the frame! Instead of the convolution
1631 below, we could have simply called FRAME_SAVED_PC() and been done
1632 with it! Note that FRAME_SAVED_PC() is being superseed by
1633 frame_pc_unwind() and that function does have somewhere to cache
1636 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1637 deprecated_update_frame_pc_hack (prev
,
1638 DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf
,
1641 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1642 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf
, prev
);
1644 /* This entry is in the frame queue now, which is good since
1645 FRAME_SAVED_PC may use that queue to figure out its value (see
1646 tm-sparc.h). We want the pc saved in the inferior frame. */
1647 if (DEPRECATED_INIT_FRAME_PC_P ())
1648 deprecated_update_frame_pc_hack (prev
,
1649 DEPRECATED_INIT_FRAME_PC (fromleaf
,
1652 /* If ->frame and ->pc are unchanged, we are in the process of
1653 getting ourselves into an infinite backtrace. Some architectures
1654 check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
1655 like there is no reason this can't be an architecture-independent
1657 if (get_frame_base (prev
) == get_frame_base (this_frame
)
1658 && get_frame_pc (prev
) == get_frame_pc (this_frame
))
1660 this_frame
->prev
= NULL
;
1661 obstack_free (&frame_cache_obstack
, prev
);
1664 fprintf_unfiltered (gdb_stdlog
, "-> ");
1665 fprint_frame (gdb_stdlog
, NULL
);
1666 fprintf_unfiltered (gdb_stdlog
,
1667 " // legacy this.id == prev.id }\n");
1672 /* Initialize the code used to unwind the frame PREV based on the PC
1673 (and probably other architectural information). The PC lets you
1674 check things like the debug info at that point (dwarf2cfi?) and
1675 use that to decide how the frame should be unwound.
1677 If there isn't a FRAME_CHAIN, the code above will have already
1679 if (prev
->unwind
== NULL
)
1680 prev
->unwind
= frame_unwind_find_by_frame (prev
->next
);
1682 /* If the unwinder provides a frame type, use it. Otherwize
1683 continue on to that heuristic mess. */
1684 if (prev
->unwind
->type
!= UNKNOWN_FRAME
)
1686 prev
->type
= prev
->unwind
->type
;
1687 if (prev
->type
== NORMAL_FRAME
)
1688 /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */
1689 prev
->this_id
.value
.code_addr
1690 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1693 fprintf_unfiltered (gdb_stdlog
, "-> ");
1694 fprint_frame (gdb_stdlog
, prev
);
1695 fprintf_unfiltered (gdb_stdlog
, " } // legacy with unwound type\n");
1700 /* NOTE: cagney/2002-11-18: The code segments, found in
1701 create_new_frame and get_prev_frame(), that initializes the
1702 frames type is subtly different. The latter only updates ->type
1703 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1704 get_prev_frame() overriding the frame's type when the INIT code
1705 has previously set it. This is really somewhat bogus. The
1706 initialization, as seen in create_new_frame(), should occur
1707 before the INIT function has been called. */
1708 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1709 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1710 ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev
), 0, 0)
1711 : pc_in_dummy_frame (get_frame_pc (prev
))))
1712 prev
->type
= DUMMY_FRAME
;
1715 /* FIXME: cagney/2002-11-10: This should be moved to before the
1716 INIT code above so that the INIT code knows what the frame's
1717 type is (in fact, for a [generic] dummy-frame, the type can
1718 be set and then the entire initialization can be skipped.
1719 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1722 find_pc_partial_function (get_frame_pc (prev
), &name
, NULL
, NULL
);
1723 if (PC_IN_SIGTRAMP (get_frame_pc (prev
), name
))
1724 prev
->type
= SIGTRAMP_FRAME
;
1725 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1726 architectures are forcing the frame's type in INIT so we
1727 don't want to override it here. Remember, NORMAL_FRAME == 0,
1728 so it all works (just :-/). Once this initialization is
1729 moved to the start of this function, all this nastness will
1733 if (prev
->type
== NORMAL_FRAME
)
1734 prev
->this_id
.value
.code_addr
1735 = get_pc_function_start (prev
->this_id
.value
.code_addr
);
1739 fprintf_unfiltered (gdb_stdlog
, "-> ");
1740 fprint_frame (gdb_stdlog
, prev
);
1741 fprintf_unfiltered (gdb_stdlog
, " } // legacy with confused type\n");
1747 /* Return a structure containing various interesting information
1748 about the frame that called THIS_FRAME. Returns NULL
1749 if there is no such frame. */
1752 get_prev_frame (struct frame_info
*this_frame
)
1754 struct frame_info
*prev_frame
;
1758 fprintf_unfiltered (gdb_stdlog
, "{ get_prev_frame (this_frame=");
1759 if (this_frame
!= NULL
)
1760 fprintf_unfiltered (gdb_stdlog
, "%d", this_frame
->level
);
1762 fprintf_unfiltered (gdb_stdlog
, "<NULL>");
1763 fprintf_unfiltered (gdb_stdlog
, ") ");
1766 /* Return the inner-most frame, when the caller passes in NULL. */
1767 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1768 caller should have previously obtained a valid frame using
1769 get_selected_frame() and then called this code - only possibility
1770 I can think of is code behaving badly.
1772 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1773 block_innermost_frame(). It does the sequence: frame = NULL;
1774 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1775 it couldn't be written better, I don't know.
1777 NOTE: cagney/2003-01-11: I suspect what is happening is
1778 block_innermost_frame() is, when the target has no state
1779 (registers, memory, ...), still calling this function. The
1780 assumption being that this function will return NULL indicating
1781 that a frame isn't possible, rather than checking that the target
1782 has state and then calling get_current_frame() and
1783 get_prev_frame(). This is a guess mind. */
1784 if (this_frame
== NULL
)
1786 /* NOTE: cagney/2002-11-09: There was a code segment here that
1787 would error out when CURRENT_FRAME was NULL. The comment
1788 that went with it made the claim ...
1790 ``This screws value_of_variable, which just wants a nice
1791 clean NULL return from block_innermost_frame if there are no
1792 frames. I don't think I've ever seen this message happen
1793 otherwise. And returning NULL here is a perfectly legitimate
1796 Per the above, this code shouldn't even be called with a NULL
1798 return current_frame
;
1801 /* There is always a frame. If this assertion fails, suspect that
1802 something should be calling get_selected_frame() or
1803 get_current_frame(). */
1804 gdb_assert (this_frame
!= NULL
);
1806 if (this_frame
->level
>= 0
1807 && !backtrace_past_main
1808 && inside_main_func (get_frame_pc (this_frame
)))
1809 /* Don't unwind past main(), bug always unwind the sentinel frame.
1810 Note, this is done _before_ the frame has been marked as
1811 previously unwound. That way if the user later decides to
1812 allow unwinds past main(), that just happens. */
1815 fprintf_unfiltered (gdb_stdlog
, "-> NULL // inside main func }\n");
1819 if (this_frame
->level
> backtrace_limit
)
1821 error ("Backtrace limit of %d exceeded", backtrace_limit
);
1824 /* If we're already inside the entry function for the main objfile,
1825 then it isn't valid. Don't apply this test to a dummy frame -
1826 dummy frame PC's typically land in the entry func. Don't apply
1827 this test to the sentinel frame. Sentinel frames should always
1828 be allowed to unwind. */
1829 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1830 hard evidence that this is needed. */
1831 /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't
1832 checking for "main" in the minimal symbols. With that fixed
1833 asm-source tests now stop in "main" instead of halting the
1834 backtrace in wierd and wonderful ways somewhere inside the entry
1835 file. Suspect that inside_entry_file and inside_entry_func tests
1836 were added to work around that (now fixed) case. */
1837 /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right)
1838 suggested having the inside_entry_func test use the
1839 inside_main_func msymbol trick (along with entry_point_address I
1840 guess) to determine the address range of the start function.
1841 That should provide a far better stopper than the current
1843 /* NOTE: cagney/2003-07-15: Need to add a "set backtrace
1844 beyond-entry-func" command so that this can be selectively
1848 && backtrace_beyond_entry_func
1850 && this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1851 && inside_entry_func (get_frame_pc (this_frame
)))
1855 fprintf_unfiltered (gdb_stdlog
, "-> ");
1856 fprint_frame (gdb_stdlog
, NULL
);
1857 fprintf_unfiltered (gdb_stdlog
, "// inside entry func }\n");
1862 /* Only try to do the unwind once. */
1863 if (this_frame
->prev_p
)
1867 fprintf_unfiltered (gdb_stdlog
, "-> ");
1868 fprint_frame (gdb_stdlog
, this_frame
->prev
);
1869 fprintf_unfiltered (gdb_stdlog
, " // cached \n");
1871 return this_frame
->prev
;
1873 this_frame
->prev_p
= 1;
1876 /* If we're inside the entry file, it isn't valid. Don't apply this
1877 test to a dummy frame - dummy frame PC's typically land in the
1878 entry file. Don't apply this test to the sentinel frame.
1879 Sentinel frames should always be allowed to unwind. */
1880 /* NOTE: drow/2002-12-25: should there be a way to disable this
1881 check? It assumes a single small entry file, and the way some
1882 debug readers (e.g. dbxread) figure out which object is the
1883 entry file is somewhat hokey. */
1884 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1885 then it should probably be moved to before the ->prev_p test,
1887 /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call to
1888 inside_entry_file destroys a meaningful backtrace under some
1889 conditions. E. g. the backtrace tests in the asm-source testcase
1890 are broken for some targets. In this test the functions are all
1891 implemented as part of one file and the testcase is not necessarily
1892 linked with a start file (depending on the target). What happens is,
1893 that the first frame is printed normaly and following frames are
1894 treated as being inside the enttry file then. This way, only the
1895 #0 frame is printed in the backtrace output. */
1896 if (this_frame
->type
!= DUMMY_FRAME
&& this_frame
->level
>= 0
1897 && inside_entry_file (get_frame_pc (this_frame
)))
1901 fprintf_unfiltered (gdb_stdlog
, "-> ");
1902 fprint_frame (gdb_stdlog
, NULL
);
1903 fprintf_unfiltered (gdb_stdlog
, " // inside entry file }\n");
1909 /* If any of the old frame initialization methods are around, use
1910 the legacy get_prev_frame method. */
1911 if (legacy_frame_p (current_gdbarch
))
1913 prev_frame
= legacy_get_prev_frame (this_frame
);
1917 /* Check that this frame's ID was valid. If it wasn't, don't try to
1918 unwind to the prev frame. Be careful to not apply this test to
1919 the sentinel frame. */
1920 if (this_frame
->level
>= 0 && !frame_id_p (get_frame_id (this_frame
)))
1924 fprintf_unfiltered (gdb_stdlog
, "-> ");
1925 fprint_frame (gdb_stdlog
, NULL
);
1926 fprintf_unfiltered (gdb_stdlog
, " // this ID is NULL }\n");
1931 /* Check that this frame's ID isn't inner to (younger, below, next)
1932 the next frame. This happens when a frame unwind goes backwards.
1933 Since the sentinel frame doesn't really exist, don't compare the
1934 inner-most against that sentinel. */
1935 if (this_frame
->level
> 0
1936 && frame_id_inner (get_frame_id (this_frame
),
1937 get_frame_id (this_frame
->next
)))
1938 error ("Previous frame inner to this frame (corrupt stack?)");
1940 /* Check that this and the next frame are not identical. If they
1941 are, there is most likely a stack cycle. As with the inner-than
1942 test above, avoid comparing the inner-most and sentinel frames. */
1943 if (this_frame
->level
> 0
1944 && frame_id_eq (get_frame_id (this_frame
),
1945 get_frame_id (this_frame
->next
)))
1946 error ("Previous frame identical to this frame (corrupt stack?)");
1948 /* Allocate the new frame but do not wire it in to the frame chain.
1949 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1950 frame->next to pull some fancy tricks (of course such code is, by
1951 definition, recursive). Try to prevent it.
1953 There is no reason to worry about memory leaks, should the
1954 remainder of the function fail. The allocated memory will be
1955 quickly reclaimed when the frame cache is flushed, and the `we've
1956 been here before' check above will stop repeated memory
1957 allocation calls. */
1958 prev_frame
= FRAME_OBSTACK_ZALLOC (struct frame_info
);
1959 prev_frame
->level
= this_frame
->level
+ 1;
1961 /* Try to unwind the PC. If that doesn't work, assume we've reached
1962 the oldest frame and simply return. Is there a better sentinal
1963 value? The unwound PC value is then used to initialize the new
1964 previous frame's type.
1966 Note that the pc-unwind is intentionally performed before the
1967 frame chain. This is ok since, for old targets, both
1968 frame_pc_unwind (nee, FRAME_SAVED_PC) and
1969 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1970 have already been initialized (using
1971 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1974 By unwinding the PC first, it becomes possible to, in the case of
1975 a dummy frame, avoid also unwinding the frame ID. This is
1976 because (well ignoring the PPC) a dummy frame can be located
1977 using THIS_FRAME's frame ID. */
1979 if (frame_pc_unwind (this_frame
) == 0)
1981 /* The allocated PREV_FRAME will be reclaimed when the frame
1982 obstack is next purged. */
1985 fprintf_unfiltered (gdb_stdlog
, "-> ");
1986 fprint_frame (gdb_stdlog
, NULL
);
1987 fprintf_unfiltered (gdb_stdlog
, " // unwound PC zero }\n");
1992 /* Don't yet compute ->unwind (and hence ->type). It is computed
1993 on-demand in get_frame_type, frame_register_unwind, and
1996 /* Don't yet compute the frame's ID. It is computed on-demand by
1999 /* The unwound frame ID is validate at the start of this function,
2000 as part of the logic to decide if that frame should be further
2001 unwound, and not here while the prev frame is being created.
2002 Doing this makes it possible for the user to examine a frame that
2003 has an invalid frame ID.
2005 Some very old VAX code noted: [...] For the sake of argument,
2006 suppose that the stack is somewhat trashed (which is one reason
2007 that "info frame" exists). So, return 0 (indicating we don't
2008 know the address of the arglist) if we don't know what frame this
2012 this_frame
->prev
= prev_frame
;
2013 prev_frame
->next
= this_frame
;
2017 fprintf_unfiltered (gdb_stdlog
, "-> ");
2018 fprint_frame (gdb_stdlog
, prev_frame
);
2019 fprintf_unfiltered (gdb_stdlog
, " }\n");
2026 get_frame_pc (struct frame_info
*frame
)
2028 gdb_assert (frame
->next
!= NULL
);
2029 return frame_pc_unwind (frame
->next
);
2032 /* Return an address of that falls within the frame's code block. */
2035 frame_unwind_address_in_block (struct frame_info
*next_frame
)
2037 /* A draft address. */
2038 CORE_ADDR pc
= frame_pc_unwind (next_frame
);
2040 /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel),
2041 and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS
2042 frame's PC ends up pointing at the instruction fallowing the
2043 "call". Adjust that PC value so that it falls on the call
2044 instruction (which, hopefully, falls within THIS frame's code
2045 block. So far it's proved to be a very good approximation. See
2046 get_frame_type for why ->type can't be used. */
2047 if (next_frame
->level
>= 0
2048 && get_frame_type (next_frame
) == NORMAL_FRAME
)
2054 get_frame_address_in_block (struct frame_info
*this_frame
)
2056 return frame_unwind_address_in_block (this_frame
->next
);
2060 pc_notcurrent (struct frame_info
*frame
)
2062 /* If FRAME is not the innermost frame, that normally means that
2063 FRAME->pc points at the return instruction (which is *after* the
2064 call instruction), and we want to get the line containing the
2065 call (because the call is where the user thinks the program is).
2066 However, if the next frame is either a SIGTRAMP_FRAME or a
2067 DUMMY_FRAME, then the next frame will contain a saved interrupt
2068 PC and such a PC indicates the current (rather than next)
2069 instruction/line, consequently, for such cases, want to get the
2070 line containing fi->pc. */
2071 struct frame_info
*next
= get_next_frame (frame
);
2072 int notcurrent
= (next
!= NULL
&& get_frame_type (next
) == NORMAL_FRAME
);
2077 find_frame_sal (struct frame_info
*frame
, struct symtab_and_line
*sal
)
2079 (*sal
) = find_pc_line (get_frame_pc (frame
), pc_notcurrent (frame
));
2082 /* Per "frame.h", return the ``address'' of the frame. Code should
2083 really be using get_frame_id(). */
2085 get_frame_base (struct frame_info
*fi
)
2087 return get_frame_id (fi
).stack_addr
;
2090 /* High-level offsets into the frame. Used by the debug info. */
2093 get_frame_base_address (struct frame_info
*fi
)
2095 if (get_frame_type (fi
) != NORMAL_FRAME
)
2097 if (fi
->base
== NULL
)
2098 fi
->base
= frame_base_find_by_frame (fi
->next
);
2099 /* Sneaky: If the low-level unwind and high-level base code share a
2100 common unwinder, let them share the prologue cache. */
2101 if (fi
->base
->unwind
== fi
->unwind
)
2102 return fi
->base
->this_base (fi
->next
, &fi
->prologue_cache
);
2103 return fi
->base
->this_base (fi
->next
, &fi
->base_cache
);
2107 get_frame_locals_address (struct frame_info
*fi
)
2110 if (get_frame_type (fi
) != NORMAL_FRAME
)
2112 /* If there isn't a frame address method, find it. */
2113 if (fi
->base
== NULL
)
2114 fi
->base
= frame_base_find_by_frame (fi
->next
);
2115 /* Sneaky: If the low-level unwind and high-level base code share a
2116 common unwinder, let them share the prologue cache. */
2117 if (fi
->base
->unwind
== fi
->unwind
)
2118 cache
= &fi
->prologue_cache
;
2120 cache
= &fi
->base_cache
;
2121 return fi
->base
->this_locals (fi
->next
, cache
);
2125 get_frame_args_address (struct frame_info
*fi
)
2128 if (get_frame_type (fi
) != NORMAL_FRAME
)
2130 /* If there isn't a frame address method, find it. */
2131 if (fi
->base
== NULL
)
2132 fi
->base
= frame_base_find_by_frame (fi
->next
);
2133 /* Sneaky: If the low-level unwind and high-level base code share a
2134 common unwinder, let them share the prologue cache. */
2135 if (fi
->base
->unwind
== fi
->unwind
)
2136 cache
= &fi
->prologue_cache
;
2138 cache
= &fi
->base_cache
;
2139 return fi
->base
->this_args (fi
->next
, cache
);
2142 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
2143 or -1 for a NULL frame. */
2146 frame_relative_level (struct frame_info
*fi
)
2155 get_frame_type (struct frame_info
*frame
)
2157 /* Some targets still don't use [generic] dummy frames. Catch them
2159 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
2160 && deprecated_frame_in_dummy (frame
))
2163 /* Some legacy code, e.g, mips_init_extra_frame_info() wants
2164 to determine the frame's type prior to it being completely
2165 initialized. Don't attempt to lazily initialize ->unwind for
2166 legacy code. It will be initialized in legacy_get_prev_frame(). */
2167 if (frame
->unwind
== NULL
&& !legacy_frame_p (current_gdbarch
))
2169 /* Initialize the frame's unwinder because it is that which
2170 provides the frame's type. */
2171 frame
->unwind
= frame_unwind_find_by_frame (frame
->next
);
2172 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
2173 type in the frame, the unwinder's type should be returned
2174 directly. Unfortunatly, legacy code, called by
2175 legacy_get_prev_frame, explicitly set the frames type using
2176 the method deprecated_set_frame_type(). */
2177 gdb_assert (frame
->unwind
->type
!= UNKNOWN_FRAME
);
2178 frame
->type
= frame
->unwind
->type
;
2180 if (frame
->type
== UNKNOWN_FRAME
)
2181 return NORMAL_FRAME
;
2187 deprecated_set_frame_type (struct frame_info
*frame
, enum frame_type type
)
2189 /* Arrrg! See comment in "frame.h". */
2193 struct frame_extra_info
*
2194 get_frame_extra_info (struct frame_info
*fi
)
2196 return fi
->extra_info
;
2199 struct frame_extra_info
*
2200 frame_extra_info_zalloc (struct frame_info
*fi
, long size
)
2202 fi
->extra_info
= frame_obstack_zalloc (size
);
2203 return fi
->extra_info
;
2207 deprecated_update_frame_pc_hack (struct frame_info
*frame
, CORE_ADDR pc
)
2210 fprintf_unfiltered (gdb_stdlog
,
2211 "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
2212 frame
->level
, paddr_nz (pc
));
2213 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
2214 maintaining a locally allocated frame object. Since such frame's
2215 are not in the frame chain, it isn't possible to assume that the
2216 frame has a next. Sigh. */
2217 if (frame
->next
!= NULL
)
2219 /* While we're at it, update this frame's cached PC value, found
2220 in the next frame. Oh for the day when "struct frame_info"
2221 is opaque and this hack on hack can just go away. */
2222 frame
->next
->prev_pc
.value
= pc
;
2223 frame
->next
->prev_pc
.p
= 1;
2228 deprecated_update_frame_base_hack (struct frame_info
*frame
, CORE_ADDR base
)
2231 fprintf_unfiltered (gdb_stdlog
,
2232 "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n",
2233 frame
->level
, paddr_nz (base
));
2234 /* See comment in "frame.h". */
2235 frame
->this_id
.value
.stack_addr
= base
;
2239 deprecated_set_frame_saved_regs_hack (struct frame_info
*frame
,
2240 CORE_ADDR
*saved_regs
)
2242 frame
->saved_regs
= saved_regs
;
2246 deprecated_set_frame_extra_info_hack (struct frame_info
*frame
,
2247 struct frame_extra_info
*extra_info
)
2249 frame
->extra_info
= extra_info
;
2253 deprecated_set_frame_next_hack (struct frame_info
*fi
,
2254 struct frame_info
*next
)
2260 deprecated_set_frame_prev_hack (struct frame_info
*fi
,
2261 struct frame_info
*prev
)
2267 deprecated_get_frame_context (struct frame_info
*fi
)
2273 deprecated_set_frame_context (struct frame_info
*fi
,
2274 struct context
*context
)
2276 fi
->context
= context
;
2280 deprecated_frame_xmalloc (void)
2282 struct frame_info
*frame
= XMALLOC (struct frame_info
);
2283 memset (frame
, 0, sizeof (*frame
));
2284 frame
->this_id
.p
= 1;
2289 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs
,
2290 long sizeof_extra_info
)
2292 struct frame_info
*frame
= deprecated_frame_xmalloc ();
2293 make_cleanup (xfree
, frame
);
2294 if (sizeof_saved_regs
> 0)
2296 frame
->saved_regs
= xcalloc (1, sizeof_saved_regs
);
2297 make_cleanup (xfree
, frame
->saved_regs
);
2299 if (sizeof_extra_info
> 0)
2301 frame
->extra_info
= xcalloc (1, sizeof_extra_info
);
2302 make_cleanup (xfree
, frame
->extra_info
);
2307 /* Memory access methods. */
2310 get_frame_memory (struct frame_info
*this_frame
, CORE_ADDR addr
, void *buf
,
2313 read_memory (addr
, buf
, len
);
2317 get_frame_memory_signed (struct frame_info
*this_frame
, CORE_ADDR addr
,
2320 return read_memory_integer (addr
, len
);
2324 get_frame_memory_unsigned (struct frame_info
*this_frame
, CORE_ADDR addr
,
2327 return read_memory_unsigned_integer (addr
, len
);
2330 /* Architecture method. */
2333 get_frame_arch (struct frame_info
*this_frame
)
2335 return current_gdbarch
;
2338 /* Stack pointer methods. */
2341 get_frame_sp (struct frame_info
*this_frame
)
2343 return frame_sp_unwind (this_frame
->next
);
2347 frame_sp_unwind (struct frame_info
*next_frame
)
2349 /* Normality, an architecture that provides a way of obtaining any
2350 frame inner-most address. */
2351 if (gdbarch_unwind_sp_p (current_gdbarch
))
2352 return gdbarch_unwind_sp (current_gdbarch
, next_frame
);
2353 /* Things are looking grim. If it's the inner-most frame and there
2354 is a TARGET_READ_SP then that can be used. */
2355 if (next_frame
->level
< 0 && TARGET_READ_SP_P ())
2356 return TARGET_READ_SP ();
2357 /* Now things are really are grim. Hope that the value returned by
2358 the SP_REGNUM register is meaningful. */
2362 frame_unwind_unsigned_register (next_frame
, SP_REGNUM
, &sp
);
2365 internal_error (__FILE__
, __LINE__
, "Missing unwind SP method");
2370 legacy_frame_p (struct gdbarch
*current_gdbarch
)
2372 return (DEPRECATED_INIT_FRAME_PC_P ()
2373 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
2374 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
2375 || DEPRECATED_FRAME_CHAIN_P ()
2376 || !gdbarch_unwind_dummy_id_p (current_gdbarch
));
2379 extern initialize_file_ftype _initialize_frame
; /* -Wmissing-prototypes */
2381 static struct cmd_list_element
*set_backtrace_cmdlist
;
2382 static struct cmd_list_element
*show_backtrace_cmdlist
;
2385 set_backtrace_cmd (char *args
, int from_tty
)
2387 help_list (set_backtrace_cmdlist
, "set backtrace ", -1, gdb_stdout
);
2391 show_backtrace_cmd (char *args
, int from_tty
)
2393 cmd_show_list (show_backtrace_cmdlist
, from_tty
, "");
2397 _initialize_frame (void)
2399 obstack_init (&frame_cache_obstack
);
2401 add_prefix_cmd ("backtrace", class_maintenance
, set_backtrace_cmd
, "\
2402 Set backtrace specific variables.\n\
2403 Configure backtrace variables such as the backtrace limit",
2404 &set_backtrace_cmdlist
, "set backtrace ",
2405 0/*allow-unknown*/, &setlist
);
2406 add_prefix_cmd ("backtrace", class_maintenance
, show_backtrace_cmd
, "\
2407 Show backtrace specific variables\n\
2408 Show backtrace variables such as the backtrace limit",
2409 &show_backtrace_cmdlist
, "show backtrace ",
2410 0/*allow-unknown*/, &showlist
);
2412 add_setshow_boolean_cmd ("past-main", class_obscure
,
2413 &backtrace_past_main
, "\
2414 Set whether backtraces should continue past \"main\".\n\
2415 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2416 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2417 of the stack trace.", "\
2418 Show whether backtraces should continue past \"main\".\n\
2419 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2420 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2421 of the stack trace.",
2422 NULL
, NULL
, &set_backtrace_cmdlist
,
2423 &show_backtrace_cmdlist
);
2425 add_setshow_uinteger_cmd ("limit", class_obscure
,
2426 &backtrace_limit
, "\
2427 Set an upper bound on the number of backtrace levels.\n\
2428 No more than the specified number of frames can be displayed or examined.\n\
2429 Zero is unlimited.", "\
2430 Show the upper bound on the number of backtrace levels.",
2431 NULL
, NULL
, &set_backtrace_cmdlist
,
2432 &show_backtrace_cmdlist
);
2434 /* Debug this files internals. */
2435 add_show_from_set (add_set_cmd ("frame", class_maintenance
, var_zinteger
,
2436 &frame_debug
, "Set frame debugging.\n\
2437 When non-zero, frame specific internal debugging is enabled.", &setdebuglist
),