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, 2004 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. Unfortunately, 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 /* The frame's low-level unwinder and corresponding cache. The
90 low-level unwinder is responsible for unwinding register values
91 for the previous frame. The low-level unwind methods are
92 selected based on the presence, or otherwize, of register unwind
93 information such as CFI. */
95 const struct frame_unwind *unwind;
97 /* Cached copy of the previous frame's resume address. */
103 /* Cached copy of the previous frame's function address. */
110 /* This frame's ID. */
114 struct frame_id value;
117 /* The frame's high-level base methods, and corresponding cache.
118 The high level base methods are selected based on the frame's
120 const struct frame_base *base;
123 /* Pointers to the next (down, inner, younger) and previous (up,
124 outer, older) frame_info's in the frame cache. */
125 struct frame_info *next; /* down, inner, younger */
127 struct frame_info *prev; /* up, outer, older */
130 /* Flag to control debugging. */
132 static int frame_debug;
134 /* Flag to indicate whether backtraces should stop at main et.al. */
136 static int backtrace_past_main;
137 static unsigned int backtrace_limit = UINT_MAX;
141 fprint_frame_id (struct ui_file *file, struct frame_id id)
143 fprintf_unfiltered (file, "{stack=0x%s,code=0x%s,special=0x%s}",
144 paddr_nz (id.stack_addr),
145 paddr_nz (id.code_addr),
146 paddr_nz (id.special_addr));
150 fprint_frame_type (struct ui_file *file, enum frame_type type)
155 fprintf_unfiltered (file, "UNKNOWN_FRAME");
158 fprintf_unfiltered (file, "NORMAL_FRAME");
161 fprintf_unfiltered (file, "DUMMY_FRAME");
164 fprintf_unfiltered (file, "SIGTRAMP_FRAME");
167 fprintf_unfiltered (file, "<unknown type>");
173 fprint_frame (struct ui_file *file, struct frame_info *fi)
177 fprintf_unfiltered (file, "<NULL frame>");
180 fprintf_unfiltered (file, "{");
181 fprintf_unfiltered (file, "level=%d", fi->level);
182 fprintf_unfiltered (file, ",");
183 fprintf_unfiltered (file, "type=");
184 fprint_frame_type (file, fi->type);
185 fprintf_unfiltered (file, ",");
186 fprintf_unfiltered (file, "unwind=");
187 if (fi->unwind != NULL)
188 gdb_print_host_address (fi->unwind, file);
190 fprintf_unfiltered (file, "<unknown>");
191 fprintf_unfiltered (file, ",");
192 fprintf_unfiltered (file, "pc=");
193 if (fi->next != NULL && fi->next->prev_pc.p)
194 fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value));
196 fprintf_unfiltered (file, "<unknown>");
197 fprintf_unfiltered (file, ",");
198 fprintf_unfiltered (file, "id=");
200 fprint_frame_id (file, fi->this_id.value);
202 fprintf_unfiltered (file, "<unknown>");
203 fprintf_unfiltered (file, ",");
204 fprintf_unfiltered (file, "func=");
205 if (fi->next != NULL && fi->next->prev_func.p)
206 fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr));
208 fprintf_unfiltered (file, "<unknown>");
209 fprintf_unfiltered (file, "}");
212 /* Return a frame uniq ID that can be used to, later, re-find the
216 get_frame_id (struct frame_info *fi)
220 return null_frame_id;
224 gdb_assert (!legacy_frame_p (current_gdbarch));
226 fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ",
228 /* Find the unwinder. */
229 if (fi->unwind == NULL)
231 fi->unwind = frame_unwind_find_by_frame (fi->next,
232 &fi->prologue_cache);
233 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
234 type in the frame, the unwinder's type should be returned
235 directly. Unfortunately, legacy code, called by
236 legacy_get_prev_frame, explicitly set the frames type
237 using the method deprecated_set_frame_type(). */
238 fi->type = fi->unwind->type;
240 /* Find THIS frame's ID. */
241 fi->unwind->this_id (fi->next, &fi->prologue_cache, &fi->this_id.value);
245 fprintf_unfiltered (gdb_stdlog, "-> ");
246 fprint_frame_id (gdb_stdlog, fi->this_id.value);
247 fprintf_unfiltered (gdb_stdlog, " }\n");
250 return fi->this_id.value;
253 const struct frame_id null_frame_id; /* All zeros. */
256 frame_id_build_special (CORE_ADDR stack_addr, CORE_ADDR code_addr,
257 CORE_ADDR special_addr)
260 id.stack_addr = stack_addr;
261 id.code_addr = code_addr;
262 id.special_addr = special_addr;
267 frame_id_build (CORE_ADDR stack_addr, CORE_ADDR code_addr)
269 return frame_id_build_special (stack_addr, code_addr, 0);
273 frame_id_p (struct frame_id l)
276 /* The .code can be NULL but the .stack cannot. */
277 p = (l.stack_addr != 0);
280 fprintf_unfiltered (gdb_stdlog, "{ frame_id_p (l=");
281 fprint_frame_id (gdb_stdlog, l);
282 fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", p);
288 frame_id_eq (struct frame_id l, struct frame_id r)
291 if (l.stack_addr == 0 || r.stack_addr == 0)
292 /* Like a NaN, if either ID is invalid, the result is false. */
294 else if (l.stack_addr != r.stack_addr)
295 /* If .stack addresses are different, the frames are different. */
297 else if (l.code_addr == 0 || r.code_addr == 0)
298 /* A zero code addr is a wild card, always succeed. */
300 else if (l.code_addr != r.code_addr)
301 /* If .code addresses are different, the frames are different. */
303 else if (l.special_addr == 0 || r.special_addr == 0)
304 /* A zero special addr is a wild card (or unused), always succeed. */
306 else if (l.special_addr == r.special_addr)
307 /* Frames are equal. */
314 fprintf_unfiltered (gdb_stdlog, "{ frame_id_eq (l=");
315 fprint_frame_id (gdb_stdlog, l);
316 fprintf_unfiltered (gdb_stdlog, ",r=");
317 fprint_frame_id (gdb_stdlog, r);
318 fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", eq);
324 frame_id_inner (struct frame_id l, struct frame_id r)
327 if (l.stack_addr == 0 || r.stack_addr == 0)
328 /* Like NaN, any operation involving an invalid ID always fails. */
331 /* Only return non-zero when strictly inner than. Note that, per
332 comment in "frame.h", there is some fuzz here. Frameless
333 functions are not strictly inner than (same .stack but
334 different .code and/or .special address). */
335 inner = INNER_THAN (l.stack_addr, r.stack_addr);
338 fprintf_unfiltered (gdb_stdlog, "{ frame_id_inner (l=");
339 fprint_frame_id (gdb_stdlog, l);
340 fprintf_unfiltered (gdb_stdlog, ",r=");
341 fprint_frame_id (gdb_stdlog, r);
342 fprintf_unfiltered (gdb_stdlog, ") -> %d }\n", inner);
348 frame_find_by_id (struct frame_id id)
350 struct frame_info *frame;
352 /* ZERO denotes the null frame, let the caller decide what to do
353 about it. Should it instead return get_current_frame()? */
354 if (!frame_id_p (id))
357 for (frame = get_current_frame ();
359 frame = get_prev_frame (frame))
361 struct frame_id this = get_frame_id (frame);
362 if (frame_id_eq (id, this))
363 /* An exact match. */
365 if (frame_id_inner (id, this))
368 /* Either, we're not yet gone far enough out along the frame
369 chain (inner(this,id), or we're comparing frameless functions
370 (same .base, different .func, no test available). Struggle
371 on until we've definitly gone to far. */
377 frame_pc_unwind (struct frame_info *this_frame)
379 if (!this_frame->prev_pc.p)
382 if (gdbarch_unwind_pc_p (current_gdbarch))
384 /* The right way. The `pure' way. The one true way. This
385 method depends solely on the register-unwind code to
386 determine the value of registers in THIS frame, and hence
387 the value of this frame's PC (resume address). A typical
388 implementation is no more than:
390 frame_unwind_register (this_frame, ISA_PC_REGNUM, buf);
391 return extract_unsigned_integer (buf, size of ISA_PC_REGNUM);
393 Note: this method is very heavily dependent on a correct
394 register-unwind implementation, it pays to fix that
395 method first; this method is frame type agnostic, since
396 it only deals with register values, it works with any
397 frame. This is all in stark contrast to the old
398 FRAME_SAVED_PC which would try to directly handle all the
399 different ways that a PC could be unwound. */
400 pc = gdbarch_unwind_pc (current_gdbarch, this_frame);
402 else if (this_frame->level < 0)
404 /* FIXME: cagney/2003-03-06: Old code and and a sentinel
405 frame. Do like was always done. Fetch the PC's value
406 direct from the global registers array (via read_pc).
407 This assumes that this frame belongs to the current
408 global register cache. The assumption is dangerous. */
411 else if (DEPRECATED_FRAME_SAVED_PC_P ())
413 /* FIXME: cagney/2003-03-06: Old code, but not a sentinel
414 frame. Do like was always done. Note that this method,
415 unlike unwind_pc(), tries to handle all the different
416 frame cases directly. It fails. */
417 pc = DEPRECATED_FRAME_SAVED_PC (this_frame);
420 internal_error (__FILE__, __LINE__, "No gdbarch_unwind_pc method");
421 this_frame->prev_pc.value = pc;
422 this_frame->prev_pc.p = 1;
424 fprintf_unfiltered (gdb_stdlog,
425 "{ frame_pc_unwind (this_frame=%d) -> 0x%s }\n",
427 paddr_nz (this_frame->prev_pc.value));
429 return this_frame->prev_pc.value;
433 frame_func_unwind (struct frame_info *fi)
435 if (!fi->prev_func.p)
437 /* Make certain that this, and not the adjacent, function is
439 CORE_ADDR addr_in_block = frame_unwind_address_in_block (fi);
441 fi->prev_func.addr = get_pc_function_start (addr_in_block);
443 fprintf_unfiltered (gdb_stdlog,
444 "{ frame_func_unwind (fi=%d) -> 0x%s }\n",
445 fi->level, paddr_nz (fi->prev_func.addr));
447 return fi->prev_func.addr;
451 get_frame_func (struct frame_info *fi)
453 return frame_func_unwind (fi->next);
457 do_frame_unwind_register (void *src, int regnum, void *buf)
459 frame_unwind_register (src, regnum, buf);
464 frame_pop (struct frame_info *this_frame)
466 struct regcache *scratch_regcache;
467 struct cleanup *cleanups;
469 if (DEPRECATED_POP_FRAME_P ())
471 /* A legacy architecture that has implemented a custom pop
472 function. All new architectures should instead be using the
473 generic code below. */
474 DEPRECATED_POP_FRAME;
478 /* Make a copy of all the register values unwound from this
479 frame. Save them in a scratch buffer so that there isn't a
480 race betweening trying to extract the old values from the
481 current_regcache while, at the same time writing new values
482 into that same cache. */
483 struct regcache *scratch = regcache_xmalloc (current_gdbarch);
484 struct cleanup *cleanups = make_cleanup_regcache_xfree (scratch);
485 regcache_save (scratch, do_frame_unwind_register, this_frame);
486 /* FIXME: cagney/2003-03-16: It should be possible to tell the
487 target's register cache that it is about to be hit with a
488 burst register transfer and that the sequence of register
489 writes should be batched. The pair target_prepare_to_store()
490 and target_store_registers() kind of suggest this
491 functionality. Unfortunately, they don't implement it. Their
492 lack of a formal definition can lead to targets writing back
493 bogus values (arguably a bug in the target code mind). */
494 /* Now copy those saved registers into the current regcache.
495 Here, regcache_cpy() calls regcache_restore(). */
496 regcache_cpy (current_regcache, scratch);
497 do_cleanups (cleanups);
499 /* We've made right mess of GDB's local state, just discard
501 flush_cached_frames ();
505 frame_register_unwind (struct frame_info *frame, int regnum,
506 int *optimizedp, enum lval_type *lvalp,
507 CORE_ADDR *addrp, int *realnump, void *bufferp)
509 struct frame_unwind_cache *cache;
513 fprintf_unfiltered (gdb_stdlog, "\
514 { frame_register_unwind (frame=%d,regnum=%d(%s),...) ",
515 frame->level, regnum,
516 frame_map_regnum_to_name (frame, regnum));
519 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
520 that the value proper does not need to be fetched. */
521 gdb_assert (optimizedp != NULL);
522 gdb_assert (lvalp != NULL);
523 gdb_assert (addrp != NULL);
524 gdb_assert (realnump != NULL);
525 /* gdb_assert (bufferp != NULL); */
527 /* NOTE: cagney/2002-11-27: A program trying to unwind a NULL frame
528 is broken. There is always a frame. If there, for some reason,
529 isn't, there is some pretty busted code as it should have
530 detected the problem before calling here. */
531 gdb_assert (frame != NULL);
533 /* Find the unwinder. */
534 if (frame->unwind == NULL)
536 frame->unwind = frame_unwind_find_by_frame (frame->next,
537 &frame->prologue_cache);
538 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
539 type in the frame, the unwinder's type should be returned
540 directly. Unfortunately, legacy code, called by
541 legacy_get_prev_frame, explicitly set the frames type using
542 the method deprecated_set_frame_type(). */
543 frame->type = frame->unwind->type;
546 /* Ask this frame to unwind its register. See comment in
547 "frame-unwind.h" for why NEXT frame and this unwind cace are
549 frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum,
550 optimizedp, lvalp, addrp, realnump, bufferp);
554 fprintf_unfiltered (gdb_stdlog, "->");
555 fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp));
556 fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp));
557 fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp)));
558 fprintf_unfiltered (gdb_stdlog, " *bufferp=");
560 fprintf_unfiltered (gdb_stdlog, "<NULL>");
564 const unsigned char *buf = bufferp;
565 fprintf_unfiltered (gdb_stdlog, "[");
566 for (i = 0; i < register_size (current_gdbarch, regnum); i++)
567 fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
568 fprintf_unfiltered (gdb_stdlog, "]");
570 fprintf_unfiltered (gdb_stdlog, " }\n");
575 frame_register (struct frame_info *frame, int regnum,
576 int *optimizedp, enum lval_type *lvalp,
577 CORE_ADDR *addrp, int *realnump, void *bufferp)
579 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
580 that the value proper does not need to be fetched. */
581 gdb_assert (optimizedp != NULL);
582 gdb_assert (lvalp != NULL);
583 gdb_assert (addrp != NULL);
584 gdb_assert (realnump != NULL);
585 /* gdb_assert (bufferp != NULL); */
587 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
588 of the register in the register cache. It should instead return
589 the REGNUM corresponding to that register. Translate the . */
590 if (DEPRECATED_GET_SAVED_REGISTER_P ())
592 DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame,
594 /* Compute the REALNUM if the caller wants it. */
595 if (*lvalp == lval_register)
598 for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
600 if (*addrp == register_offset_hack (current_gdbarch, regnum))
606 internal_error (__FILE__, __LINE__,
607 "Failed to compute the register number corresponding"
608 " to 0x%s", paddr_d (*addrp));
614 /* Obtain the register value by unwinding the register from the next
615 (more inner frame). */
616 gdb_assert (frame != NULL && frame->next != NULL);
617 frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp,
622 frame_unwind_register (struct frame_info *frame, int regnum, void *buf)
628 frame_register_unwind (frame, regnum, &optimized, &lval, &addr,
633 get_frame_register (struct frame_info *frame,
634 int regnum, void *buf)
636 frame_unwind_register (frame->next, regnum, buf);
640 frame_unwind_register_signed (struct frame_info *frame, int regnum)
642 char buf[MAX_REGISTER_SIZE];
643 frame_unwind_register (frame, regnum, buf);
644 return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
648 get_frame_register_signed (struct frame_info *frame, int regnum)
650 return frame_unwind_register_signed (frame->next, regnum);
654 frame_unwind_register_unsigned (struct frame_info *frame, int regnum)
656 char buf[MAX_REGISTER_SIZE];
657 frame_unwind_register (frame, regnum, buf);
658 return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
662 get_frame_register_unsigned (struct frame_info *frame, int regnum)
664 return frame_unwind_register_unsigned (frame->next, regnum);
668 frame_unwind_unsigned_register (struct frame_info *frame, int regnum,
671 char buf[MAX_REGISTER_SIZE];
672 frame_unwind_register (frame, regnum, buf);
673 (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
677 put_frame_register (struct frame_info *frame, int regnum, const void *buf)
679 struct gdbarch *gdbarch = get_frame_arch (frame);
684 frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL);
686 error ("Attempt to assign to a value that was optimized out.");
691 /* FIXME: write_memory doesn't yet take constant buffers.
693 char tmp[MAX_REGISTER_SIZE];
694 memcpy (tmp, buf, register_size (gdbarch, regnum));
695 write_memory (addr, tmp, register_size (gdbarch, regnum));
699 regcache_cooked_write (current_regcache, realnum, buf);
702 error ("Attempt to assign to an unmodifiable value.");
706 /* frame_register_read ()
708 Find and return the value of REGNUM for the specified stack frame.
709 The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE
712 Returns 0 if the register value could not be found. */
715 frame_register_read (struct frame_info *frame, int regnum, void *myaddr)
721 frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr);
723 /* FIXME: cagney/2002-05-15: This test, is just bogus.
725 It indicates that the target failed to supply a value for a
726 register because it was "not available" at this time. Problem
727 is, the target still has the register and so get saved_register()
728 may be returning a value saved on the stack. */
730 if (register_cached (regnum) < 0)
731 return 0; /* register value not available */
737 /* Map between a frame register number and its name. A frame register
738 space is a superset of the cooked register space --- it also
739 includes builtin registers. */
742 frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len)
744 return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len);
748 frame_map_regnum_to_name (struct frame_info *frame, int regnum)
750 return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum);
753 /* Create a sentinel frame. */
755 static struct frame_info *
756 create_sentinel_frame (struct regcache *regcache)
758 struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
759 frame->type = NORMAL_FRAME;
761 /* Explicitly initialize the sentinel frame's cache. Provide it
762 with the underlying regcache. In the future additional
763 information, such as the frame's thread will be added. */
764 frame->prologue_cache = sentinel_frame_cache (regcache);
765 /* For the moment there is only one sentinel frame implementation. */
766 frame->unwind = sentinel_frame_unwind;
767 /* Link this frame back to itself. The frame is self referential
768 (the unwound PC is the same as the pc), so make it so. */
770 /* Make the sentinel frame's ID valid, but invalid. That way all
771 comparisons with it should fail. */
772 frame->this_id.p = 1;
773 frame->this_id.value = null_frame_id;
776 fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> ");
777 fprint_frame (gdb_stdlog, frame);
778 fprintf_unfiltered (gdb_stdlog, " }\n");
783 /* Info about the innermost stack frame (contents of FP register) */
785 static struct frame_info *current_frame;
787 /* Cache for frame addresses already read by gdb. Valid only while
788 inferior is stopped. Control variables for the frame cache should
789 be local to this module. */
791 static struct obstack frame_cache_obstack;
794 frame_obstack_zalloc (unsigned long size)
796 void *data = obstack_alloc (&frame_cache_obstack, size);
797 memset (data, 0, size);
802 frame_saved_regs_zalloc (struct frame_info *fi)
804 fi->saved_regs = (CORE_ADDR *)
805 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
806 return fi->saved_regs;
810 deprecated_get_frame_saved_regs (struct frame_info *fi)
812 return fi->saved_regs;
815 /* Return the innermost (currently executing) stack frame. This is
816 split into two functions. The function unwind_to_current_frame()
817 is wrapped in catch exceptions so that, even when the unwind of the
818 sentinel frame fails, the function still returns a stack frame. */
821 unwind_to_current_frame (struct ui_out *ui_out, void *args)
823 struct frame_info *frame = get_prev_frame (args);
824 /* A sentinel frame can fail to unwind, eg, because it's PC value
825 lands in somewhere like start. */
828 current_frame = frame;
833 get_current_frame (void)
835 /* First check, and report, the lack of registers. Having GDB
836 report "No stack!" or "No memory" when the target doesn't even
837 have registers is very confusing. Besides, "printcmd.exp"
838 explicitly checks that ``print $pc'' with no registers prints "No
840 if (!target_has_registers)
841 error ("No registers.");
842 if (!target_has_stack)
844 if (!target_has_memory)
845 error ("No memory.");
846 if (current_frame == NULL)
848 struct frame_info *sentinel_frame =
849 create_sentinel_frame (current_regcache);
850 if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame,
851 NULL, RETURN_MASK_ERROR) != 0)
853 /* Oops! Fake a current frame? Is this useful? It has a PC
854 of zero, for instance. */
855 current_frame = sentinel_frame;
858 return current_frame;
861 /* The "selected" stack frame is used by default for local and arg
862 access. May be zero, for no selected frame. */
864 struct frame_info *deprecated_selected_frame;
866 /* Return the selected frame. Always non-null (unless there isn't an
867 inferior sufficient for creating a frame) in which case an error is
871 get_selected_frame (void)
873 if (deprecated_selected_frame == NULL)
874 /* Hey! Don't trust this. It should really be re-finding the
875 last selected frame of the currently selected thread. This,
876 though, is better than nothing. */
877 select_frame (get_current_frame ());
878 /* There is always a frame. */
879 gdb_assert (deprecated_selected_frame != NULL);
880 return deprecated_selected_frame;
883 /* This is a variant of get_selected_frame which can be called when
884 the inferior does not have a frame; in that case it will return
885 NULL instead of calling error (). */
888 deprecated_safe_get_selected_frame (void)
890 if (!target_has_registers || !target_has_stack || !target_has_memory)
892 return get_selected_frame ();
895 /* Select frame FI (or NULL - to invalidate the current frame). */
898 select_frame (struct frame_info *fi)
902 deprecated_selected_frame = fi;
903 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
904 frame is being invalidated. */
905 if (selected_frame_level_changed_hook)
906 selected_frame_level_changed_hook (frame_relative_level (fi));
908 /* FIXME: kseitz/2002-08-28: It would be nice to call
909 selected_frame_level_changed_event right here, but due to limitations
910 in the current interfaces, we would end up flooding UIs with events
911 because select_frame is used extensively internally.
913 Once we have frame-parameterized frame (and frame-related) commands,
914 the event notification can be moved here, since this function will only
915 be called when the users selected frame is being changed. */
917 /* Ensure that symbols for this frame are read in. Also, determine the
918 source language of this frame, and switch to it if desired. */
921 /* We retrieve the frame's symtab by using the frame PC. However
922 we cannot use the frame pc as is, because it usually points to
923 the instruction following the "call", which is sometimes the
924 first instruction of another function. So we rely on
925 get_frame_address_in_block() which provides us with a PC which
926 is guaranteed to be inside the frame's code block. */
927 s = find_pc_symtab (get_frame_address_in_block (fi));
929 && s->language != current_language->la_language
930 && s->language != language_unknown
931 && language_mode == language_mode_auto)
933 set_language (s->language);
938 /* Return the register saved in the simplistic ``saved_regs'' cache.
939 If the value isn't here AND a value is needed, try the next inner
943 legacy_saved_regs_prev_register (struct frame_info *next_frame,
944 void **this_prologue_cache,
945 int regnum, int *optimizedp,
946 enum lval_type *lvalp, CORE_ADDR *addrp,
947 int *realnump, void *bufferp)
949 /* HACK: New code is passed the next frame and this cache.
950 Unfortunately, old code expects this frame. Since this is a
951 backward compatibility hack, cheat by walking one level along the
952 prologue chain to the frame the old code expects.
954 Do not try this at home. Professional driver, closed course. */
955 struct frame_info *frame = next_frame->prev;
956 gdb_assert (frame != NULL);
958 if (deprecated_get_frame_saved_regs (frame) == NULL)
960 /* If nothing's initialized the saved regs, do it now. */
961 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
962 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
963 gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL);
966 if (deprecated_get_frame_saved_regs (frame) != NULL
967 && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
969 if (regnum == SP_REGNUM)
971 /* SP register treated specially. */
977 /* NOTE: cagney/2003-05-09: In-lined store_address with
978 it's body - store_unsigned_integer. */
979 store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum),
980 deprecated_get_frame_saved_regs (frame)[regnum]);
984 /* Any other register is saved in memory, fetch it but cache
985 a local copy of its value. */
987 *lvalp = lval_memory;
988 *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
993 /* Save each register value, as it is read in, in a
994 frame based cache. */
995 void **regs = (*this_prologue_cache);
998 int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS)
1000 regs = frame_obstack_zalloc (sizeof_cache);
1001 (*this_prologue_cache) = regs;
1003 if (regs[regnum] == NULL)
1006 = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum));
1007 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum],
1008 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1010 memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum));
1012 /* Read the value in from memory. */
1013 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp,
1014 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1021 /* No luck. Assume this and the next frame have the same register
1022 value. Pass the unwind request down the frame chain to the next
1023 frame. Hopefully that frame will find the register's location. */
1024 frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp,
1029 legacy_saved_regs_this_id (struct frame_info *next_frame,
1030 void **this_prologue_cache,
1031 struct frame_id *id)
1033 /* A developer is trying to bring up a new architecture, help them
1034 by providing a default unwinder that refuses to unwind anything
1035 (the ID is always NULL). In the case of legacy code,
1036 legacy_get_prev_frame() will have previously set ->this_id.p, so
1037 this code won't be called. */
1038 (*id) = null_frame_id;
1041 const struct frame_unwind legacy_saved_regs_unwinder = {
1042 /* Not really. It gets overridden by legacy_get_prev_frame. */
1044 legacy_saved_regs_this_id,
1045 legacy_saved_regs_prev_register
1047 const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder;
1050 /* Function: deprecated_generic_get_saved_register
1051 Find register number REGNUM relative to FRAME and put its (raw,
1052 target format) contents in *RAW_BUFFER.
1054 Set *OPTIMIZED if the variable was optimized out (and thus can't be
1055 fetched). Note that this is never set to anything other than zero
1056 in this implementation.
1058 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
1059 whether the value was fetched from memory, from a register, or in a
1060 strange and non-modifiable way (e.g. a frame pointer which was
1061 calculated rather than fetched). We will use not_lval for values
1062 fetched from generic dummy frames.
1064 Set *ADDRP to the address, either in memory or as a
1065 DEPRECATED_REGISTER_BYTE offset into the registers array. If the
1066 value is stored in a dummy frame, set *ADDRP to zero.
1068 The argument RAW_BUFFER must point to aligned memory. */
1071 deprecated_generic_get_saved_register (char *raw_buffer, int *optimized,
1073 struct frame_info *frame, int regnum,
1074 enum lval_type *lval)
1076 if (!target_has_registers)
1077 error ("No registers.");
1079 /* Normal systems don't optimize out things with register numbers. */
1080 if (optimized != NULL)
1083 if (addrp) /* default assumption: not found in memory */
1086 /* Note: since the current frame's registers could only have been
1087 saved by frames INTERIOR TO the current frame, we skip examining
1088 the current frame itself: otherwise, we would be getting the
1089 previous frame's registers which were saved by the current frame. */
1093 for (frame = get_next_frame (frame);
1094 frame_relative_level (frame) >= 0;
1095 frame = get_next_frame (frame))
1097 if (get_frame_type (frame) == DUMMY_FRAME)
1099 if (lval) /* found it in a CALL_DUMMY frame */
1102 /* FIXME: cagney/2002-06-26: This should be via the
1103 gdbarch_register_read() method so that it, on the
1104 fly, constructs either a raw or pseudo register
1105 from the raw register cache. */
1107 (deprecated_find_dummy_frame_regcache (get_frame_pc (frame),
1108 get_frame_base (frame)),
1109 regnum, raw_buffer);
1113 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
1114 if (deprecated_get_frame_saved_regs (frame) != NULL
1115 && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
1117 if (lval) /* found it saved on the stack */
1118 *lval = lval_memory;
1119 if (regnum == SP_REGNUM)
1121 if (raw_buffer) /* SP register treated specially */
1122 /* NOTE: cagney/2003-05-09: In-line store_address
1123 with it's body - store_unsigned_integer. */
1124 store_unsigned_integer (raw_buffer,
1125 DEPRECATED_REGISTER_RAW_SIZE (regnum),
1126 deprecated_get_frame_saved_regs (frame)[regnum]);
1130 if (addrp) /* any other register */
1131 *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
1133 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer,
1134 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1141 /* If we get thru the loop to this point, it means the register was
1142 not saved in any frame. Return the actual live-register value. */
1144 if (lval) /* found it in a live register */
1145 *lval = lval_register;
1147 *addrp = DEPRECATED_REGISTER_BYTE (regnum);
1149 deprecated_read_register_gen (regnum, raw_buffer);
1152 /* Determine the frame's type based on its PC. */
1154 static enum frame_type
1155 frame_type_from_pc (CORE_ADDR pc)
1157 /* FIXME: cagney/2002-11-24: Can't yet directly call
1158 pc_in_dummy_frame() as some architectures don't set
1159 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
1160 latter is implemented by simply calling pc_in_dummy_frame). */
1161 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1162 && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
1167 find_pc_partial_function (pc, &name, NULL, NULL);
1168 if (PC_IN_SIGTRAMP (pc, name))
1169 return SIGTRAMP_FRAME;
1171 return NORMAL_FRAME;
1175 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
1176 Always returns a non-NULL value. */
1179 create_new_frame (CORE_ADDR addr, CORE_ADDR pc)
1181 struct frame_info *fi;
1185 fprintf_unfiltered (gdb_stdlog,
1186 "{ create_new_frame (addr=0x%s, pc=0x%s) ",
1187 paddr_nz (addr), paddr_nz (pc));
1190 fi = frame_obstack_zalloc (sizeof (struct frame_info));
1192 fi->next = create_sentinel_frame (current_regcache);
1194 /* Select/initialize both the unwind function and the frame's type
1196 fi->unwind = frame_unwind_find_by_frame (fi->next, &fi->prologue_cache);
1197 if (fi->unwind->type != UNKNOWN_FRAME)
1198 fi->type = fi->unwind->type;
1200 fi->type = frame_type_from_pc (pc);
1203 deprecated_update_frame_base_hack (fi, addr);
1204 deprecated_update_frame_pc_hack (fi, pc);
1206 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1207 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi);
1211 fprintf_unfiltered (gdb_stdlog, "-> ");
1212 fprint_frame (gdb_stdlog, fi);
1213 fprintf_unfiltered (gdb_stdlog, " }\n");
1219 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
1220 innermost frame). Be careful to not fall off the bottom of the
1221 frame chain and onto the sentinel frame. */
1224 get_next_frame (struct frame_info *this_frame)
1226 if (this_frame->level > 0)
1227 return this_frame->next;
1232 /* Flush the entire frame cache. */
1235 flush_cached_frames (void)
1237 /* Since we can't really be sure what the first object allocated was */
1238 obstack_free (&frame_cache_obstack, 0);
1239 obstack_init (&frame_cache_obstack);
1241 current_frame = NULL; /* Invalidate cache */
1242 select_frame (NULL);
1243 annotate_frames_invalid ();
1245 fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n");
1248 /* Flush the frame cache, and start a new one if necessary. */
1251 reinit_frame_cache (void)
1253 flush_cached_frames ();
1255 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
1256 if (PIDGET (inferior_ptid) != 0)
1258 select_frame (get_current_frame ());
1262 /* Create the previous frame using the deprecated methods
1263 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1265 static struct frame_info *
1266 legacy_get_prev_frame (struct frame_info *this_frame)
1268 CORE_ADDR address = 0;
1269 struct frame_info *prev;
1272 /* Don't frame_debug print legacy_get_prev_frame() here, just
1273 confuses the output. */
1275 /* Allocate the new frame.
1277 There is no reason to worry about memory leaks, should the
1278 remainder of the function fail. The allocated memory will be
1279 quickly reclaimed when the frame cache is flushed, and the `we've
1280 been here before' check, in get_prev_frame will stop repeated
1281 memory allocation calls. */
1282 prev = FRAME_OBSTACK_ZALLOC (struct frame_info);
1283 prev->level = this_frame->level + 1;
1285 /* Do not completely wire it in to the frame chain. Some (bad) code
1286 in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
1287 some fancy tricks (of course such code is, by definition,
1290 On the other hand, methods, such as get_frame_pc() and
1291 get_frame_base() rely on being able to walk along the frame
1292 chain. Make certain that at least they work by providing that
1293 link. Of course things manipulating prev can't go back. */
1294 prev->next = this_frame;
1296 /* NOTE: cagney/2002-11-18: Should have been correctly setting the
1297 frame's type here, before anything else, and not last, at the
1298 bottom of this function. The various
1299 DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
1300 DEPRECATED_INIT_FRAME_PC_FIRST and
1301 DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
1302 that handle the frame not being correctly set from the start.
1303 Unfortunately those same work-arounds rely on the type defaulting
1304 to NORMAL_FRAME. Ulgh! The new frame code does not have this
1306 prev->type = UNKNOWN_FRAME;
1308 /* A legacy frame's ID is always computed here. Mark it as valid. */
1309 prev->this_id.p = 1;
1311 /* Handle sentinel frame unwind as a special case. */
1312 if (this_frame->level < 0)
1314 /* Try to unwind the PC. If that doesn't work, assume we've reached
1315 the oldest frame and simply return. Is there a better sentinal
1316 value? The unwound PC value is then used to initialize the new
1317 previous frame's type.
1319 Note that the pc-unwind is intentionally performed before the
1320 frame chain. This is ok since, for old targets, both
1321 frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
1322 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1323 have already been initialized (using
1324 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1327 By unwinding the PC first, it becomes possible to, in the case of
1328 a dummy frame, avoid also unwinding the frame ID. This is
1329 because (well ignoring the PPC) a dummy frame can be located
1330 using THIS_FRAME's frame ID. */
1332 deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame));
1333 if (get_frame_pc (prev) == 0)
1335 /* The allocated PREV_FRAME will be reclaimed when the frame
1336 obstack is next purged. */
1339 fprintf_unfiltered (gdb_stdlog, "-> ");
1340 fprint_frame (gdb_stdlog, NULL);
1341 fprintf_unfiltered (gdb_stdlog,
1342 " // unwound legacy PC zero }\n");
1347 /* Set the unwind functions based on that identified PC. Ditto
1348 for the "type" but strongly prefer the unwinder's frame type. */
1349 prev->unwind = frame_unwind_find_by_frame (prev->next,
1350 &prev->prologue_cache);
1351 if (prev->unwind->type == UNKNOWN_FRAME)
1352 prev->type = frame_type_from_pc (get_frame_pc (prev));
1354 prev->type = prev->unwind->type;
1356 /* Find the prev's frame's ID. */
1357 if (prev->type == DUMMY_FRAME
1358 && gdbarch_unwind_dummy_id_p (current_gdbarch))
1360 /* When unwinding a normal frame, the stack structure is
1361 determined by analyzing the frame's function's code (be
1362 it using brute force prologue analysis, or the dwarf2
1363 CFI). In the case of a dummy frame, that simply isn't
1364 possible. The The PC is either the program entry point,
1365 or some random address on the stack. Trying to use that
1366 PC to apply standard frame ID unwind techniques is just
1367 asking for trouble. */
1368 /* Use an architecture specific method to extract the prev's
1369 dummy ID from the next frame. Note that this method uses
1370 frame_register_unwind to obtain the register values
1371 needed to determine the dummy frame's ID. */
1372 prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch,
1377 /* We're unwinding a sentinel frame, the PC of which is
1378 pointing at a stack dummy. Fake up the dummy frame's ID
1379 using the same sequence as is found a traditional
1380 unwinder. Once all architectures supply the
1381 unwind_dummy_id method, this code can go away. */
1382 prev->this_id.value = frame_id_build (deprecated_read_fp (),
1386 /* Check that the unwound ID is valid. */
1387 if (!frame_id_p (prev->this_id.value))
1391 fprintf_unfiltered (gdb_stdlog, "-> ");
1392 fprint_frame (gdb_stdlog, NULL);
1393 fprintf_unfiltered (gdb_stdlog,
1394 " // unwound legacy ID invalid }\n");
1399 /* Check that the new frame isn't inner to (younger, below,
1400 next) the old frame. If that happens the frame unwind is
1402 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1403 that doesn't have a valid frame ID. Should instead set the
1404 sentinel frame's frame ID to a `sentinel'. Leave it until
1405 after the switch to storing the frame ID, instead of the
1406 frame base, in the frame object. */
1409 this_frame->prev = prev;
1411 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1412 initializing extra info, all frames will use the frame_cache
1413 (passed to the unwind functions) to store additional frame
1414 info. Unfortunately legacy targets can't use
1415 legacy_get_prev_frame() to unwind the sentinel frame and,
1416 consequently, are forced to take this code path and rely on
1417 the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
1418 initialize the inner-most frame. */
1419 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1421 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev);
1424 if (prev->type == NORMAL_FRAME)
1425 prev->this_id.value.code_addr
1426 = get_pc_function_start (prev->this_id.value.code_addr);
1430 fprintf_unfiltered (gdb_stdlog, "-> ");
1431 fprint_frame (gdb_stdlog, prev);
1432 fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n");
1437 /* This code only works on normal frames. A sentinel frame, where
1438 the level is -1, should never reach this code. */
1439 gdb_assert (this_frame->level >= 0);
1441 /* On some machines it is possible to call a function without
1442 setting up a stack frame for it. On these machines, we
1443 define this macro to take two args; a frameinfo pointer
1444 identifying a frame and a variable to set or clear if it is
1445 or isn't leafless. */
1447 /* Still don't want to worry about this except on the innermost
1448 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1449 function invocation. */
1450 if (this_frame->level == 0)
1451 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1452 the frame chain, not just the inner most frame! The generic,
1453 per-architecture, frame code should handle this and the below
1454 should simply be removed. */
1455 fromleaf = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P ()
1456 && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (this_frame));
1461 /* A frameless inner-most frame. The `FP' (which isn't an
1462 architecture frame-pointer register!) of the caller is the same
1464 /* FIXME: 2002-11-09: There isn't any reason to special case this
1465 edge condition. Instead the per-architecture code should hande
1467 /* FIXME: cagney/2003-06-16: This returns the inner most stack
1468 address for the previous frame, that, however, is wrong. It
1469 should be the inner most stack address for the previous to
1470 previous frame. This is because it is the previous to previous
1471 frame's innermost stack address that is constant through out
1472 the lifetime of the previous frame (trust me :-). */
1473 address = get_frame_base (this_frame);
1476 /* Two macros defined in tm.h specify the machine-dependent
1477 actions to be performed here.
1479 First, get the frame's chain-pointer.
1481 If that is zero, the frame is the outermost frame or a leaf
1482 called by the outermost frame. This means that if start
1483 calls main without a frame, we'll return 0 (which is fine
1486 Nope; there's a problem. This also returns when the current
1487 routine is a leaf of main. This is unacceptable. We move
1488 this to after the ffi test; I'd rather have backtraces from
1489 start go curfluy than have an abort called from main not show
1491 if (DEPRECATED_FRAME_CHAIN_P ())
1492 address = DEPRECATED_FRAME_CHAIN (this_frame);
1495 /* Someone is part way through coverting an old architecture
1496 to the new frame code. Implement FRAME_CHAIN the way the
1498 /* Find PREV frame's unwinder. */
1499 prev->unwind = frame_unwind_find_by_frame (this_frame,
1500 &prev->prologue_cache);
1501 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
1502 type in the frame, the unwinder's type should be returned
1503 directly. Unfortunately, legacy code, called by
1504 legacy_get_prev_frame, explicitly set the frames type
1505 using the method deprecated_set_frame_type(). */
1506 prev->type = prev->unwind->type;
1507 /* Find PREV frame's ID. */
1508 prev->unwind->this_id (this_frame,
1509 &prev->prologue_cache,
1510 &prev->this_id.value);
1511 prev->this_id.p = 1;
1512 address = prev->this_id.value.stack_addr;
1515 if (!legacy_frame_chain_valid (address, this_frame))
1519 fprintf_unfiltered (gdb_stdlog, "-> ");
1520 fprint_frame (gdb_stdlog, NULL);
1521 fprintf_unfiltered (gdb_stdlog,
1522 " // legacy frame chain invalid }\n");
1531 fprintf_unfiltered (gdb_stdlog, "-> ");
1532 fprint_frame (gdb_stdlog, NULL);
1533 fprintf_unfiltered (gdb_stdlog,
1534 " // legacy frame chain NULL }\n");
1539 /* Link in the already allocated prev frame. */
1540 this_frame->prev = prev;
1541 deprecated_update_frame_base_hack (prev, address);
1543 /* This change should not be needed, FIXME! We should determine
1544 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1545 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1546 way to express what goes on here.
1548 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1549 create_new_frame (where the PC is already set up) and here (where
1550 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1551 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1553 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1554 requires the PC value (which hasn't been set yet). Some other
1555 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1556 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1558 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1559 complication to an already overcomplicated part of GDB.
1560 gnu@cygnus.com, 15Sep92.
1562 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1563 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1565 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1566 (deprecated_read_fp ()), read_pc ()). Machines with extra frame
1567 info would do that (or the local equivalent) and then set the
1570 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1571 create_new_frame would no longer init extra frame info;
1572 SETUP_ARBITRARY_FRAME would have to do that.
1574 INIT_PREV_FRAME(fromleaf, prev) Replace
1575 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1576 This should also return a flag saying whether to keep the new
1577 frame, or whether to discard it, because on some machines (e.g.
1578 mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
1579 called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
1580 way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
1581 into the extra fields of the new frame). std_frame_pc(fromleaf,
1584 This is the default setting for INIT_PREV_FRAME. It just does
1585 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1586 will call it from INIT_PREV_FRAME (either at the beginning, the
1587 end, or in the middle). Some machines won't use it.
1589 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1591 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1592 reason for things to be this complicated.
1594 The trick is to assume that there is always a frame. Instead of
1595 special casing the inner-most frame, create fake frame
1596 (containing the hardware registers) that is inner to the
1597 user-visible inner-most frame (...) and then unwind from that.
1598 That way architecture code can use use the standard
1599 frame_XX_unwind() functions and not differentiate between the
1600 inner most and any other case.
1602 Since there is always a frame to unwind from, there is always
1603 somewhere (THIS_FRAME) to store all the info needed to construct
1604 a new (previous) frame without having to first create it. This
1605 means that the convolution below - needing to carefully order a
1606 frame's initialization - isn't needed.
1608 The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
1609 for a more up-to-date architecture, always calls
1610 FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
1611 without first needing the frame! Instead of the convolution
1612 below, we could have simply called FRAME_SAVED_PC() and been done
1613 with it! Note that FRAME_SAVED_PC() is being superseed by
1614 frame_pc_unwind() and that function does have somewhere to cache
1617 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1618 deprecated_update_frame_pc_hack (prev,
1619 DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf,
1622 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1623 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev);
1625 /* This entry is in the frame queue now, which is good since
1626 FRAME_SAVED_PC may use that queue to figure out its value (see
1627 tm-sparc.h). We want the pc saved in the inferior frame. */
1628 if (DEPRECATED_INIT_FRAME_PC_P ())
1629 deprecated_update_frame_pc_hack (prev,
1630 DEPRECATED_INIT_FRAME_PC (fromleaf,
1633 /* If ->frame and ->pc are unchanged, we are in the process of
1634 getting ourselves into an infinite backtrace. Some architectures
1635 check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
1636 like there is no reason this can't be an architecture-independent
1638 if (get_frame_base (prev) == get_frame_base (this_frame)
1639 && get_frame_pc (prev) == get_frame_pc (this_frame))
1641 this_frame->prev = NULL;
1642 obstack_free (&frame_cache_obstack, prev);
1645 fprintf_unfiltered (gdb_stdlog, "-> ");
1646 fprint_frame (gdb_stdlog, NULL);
1647 fprintf_unfiltered (gdb_stdlog,
1648 " // legacy this.id == prev.id }\n");
1653 /* Initialize the code used to unwind the frame PREV based on the PC
1654 (and probably other architectural information). The PC lets you
1655 check things like the debug info at that point (dwarf2cfi?) and
1656 use that to decide how the frame should be unwound.
1658 If there isn't a FRAME_CHAIN, the code above will have already
1660 if (prev->unwind == NULL)
1661 prev->unwind = frame_unwind_find_by_frame (prev->next,
1662 &prev->prologue_cache);
1664 /* If the unwinder provides a frame type, use it. Otherwize
1665 continue on to that heuristic mess. */
1666 if (prev->unwind->type != UNKNOWN_FRAME)
1668 prev->type = prev->unwind->type;
1669 if (prev->type == NORMAL_FRAME)
1670 /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */
1671 prev->this_id.value.code_addr
1672 = get_pc_function_start (prev->this_id.value.code_addr);
1675 fprintf_unfiltered (gdb_stdlog, "-> ");
1676 fprint_frame (gdb_stdlog, prev);
1677 fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n");
1682 /* NOTE: cagney/2002-11-18: The code segments, found in
1683 create_new_frame and get_prev_frame(), that initializes the
1684 frames type is subtly different. The latter only updates ->type
1685 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1686 get_prev_frame() overriding the frame's type when the INIT code
1687 has previously set it. This is really somewhat bogus. The
1688 initialization, as seen in create_new_frame(), should occur
1689 before the INIT function has been called. */
1690 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1691 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1692 ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0)
1693 : pc_in_dummy_frame (get_frame_pc (prev))))
1694 prev->type = DUMMY_FRAME;
1697 /* FIXME: cagney/2002-11-10: This should be moved to before the
1698 INIT code above so that the INIT code knows what the frame's
1699 type is (in fact, for a [generic] dummy-frame, the type can
1700 be set and then the entire initialization can be skipped.
1701 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1704 find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL);
1705 if (PC_IN_SIGTRAMP (get_frame_pc (prev), name))
1706 prev->type = SIGTRAMP_FRAME;
1707 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1708 architectures are forcing the frame's type in INIT so we
1709 don't want to override it here. Remember, NORMAL_FRAME == 0,
1710 so it all works (just :-/). Once this initialization is
1711 moved to the start of this function, all this nastness will
1715 if (prev->type == NORMAL_FRAME)
1716 prev->this_id.value.code_addr
1717 = get_pc_function_start (prev->this_id.value.code_addr);
1721 fprintf_unfiltered (gdb_stdlog, "-> ");
1722 fprint_frame (gdb_stdlog, prev);
1723 fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n");
1729 /* Return a structure containing various interesting information
1730 about the frame that called THIS_FRAME. Returns NULL
1731 if there is no such frame.
1733 This function tests some target-independent conditions that should
1734 terminate the frame chain, such as unwinding past main(). It
1735 should not contain any target-dependent tests, such as checking
1736 whether the program-counter is zero. */
1739 get_prev_frame (struct frame_info *this_frame)
1741 struct frame_info *prev_frame;
1745 fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame=");
1746 if (this_frame != NULL)
1747 fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level);
1749 fprintf_unfiltered (gdb_stdlog, "<NULL>");
1750 fprintf_unfiltered (gdb_stdlog, ") ");
1753 /* Return the inner-most frame, when the caller passes in NULL. */
1754 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1755 caller should have previously obtained a valid frame using
1756 get_selected_frame() and then called this code - only possibility
1757 I can think of is code behaving badly.
1759 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1760 block_innermost_frame(). It does the sequence: frame = NULL;
1761 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1762 it couldn't be written better, I don't know.
1764 NOTE: cagney/2003-01-11: I suspect what is happening is
1765 block_innermost_frame() is, when the target has no state
1766 (registers, memory, ...), still calling this function. The
1767 assumption being that this function will return NULL indicating
1768 that a frame isn't possible, rather than checking that the target
1769 has state and then calling get_current_frame() and
1770 get_prev_frame(). This is a guess mind. */
1771 if (this_frame == NULL)
1773 /* NOTE: cagney/2002-11-09: There was a code segment here that
1774 would error out when CURRENT_FRAME was NULL. The comment
1775 that went with it made the claim ...
1777 ``This screws value_of_variable, which just wants a nice
1778 clean NULL return from block_innermost_frame if there are no
1779 frames. I don't think I've ever seen this message happen
1780 otherwise. And returning NULL here is a perfectly legitimate
1783 Per the above, this code shouldn't even be called with a NULL
1785 return current_frame;
1788 /* There is always a frame. If this assertion fails, suspect that
1789 something should be calling get_selected_frame() or
1790 get_current_frame(). */
1791 gdb_assert (this_frame != NULL);
1793 /* Make sure we pass an address within THIS_FRAME's code block to
1794 inside_main_func. Otherwise, we might stop unwinding at a
1795 function which has a call instruction as its last instruction if
1796 that function immediately precedes main(). */
1797 if (this_frame->level >= 0
1798 && !backtrace_past_main
1799 && inside_main_func (get_frame_address_in_block (this_frame)))
1800 /* Don't unwind past main(), bug always unwind the sentinel frame.
1801 Note, this is done _before_ the frame has been marked as
1802 previously unwound. That way if the user later decides to
1803 allow unwinds past main(), that just happens. */
1806 fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n");
1810 if (this_frame->level > backtrace_limit)
1812 error ("Backtrace limit of %d exceeded", backtrace_limit);
1815 /* If we're already inside the entry function for the main objfile,
1816 then it isn't valid. Don't apply this test to a dummy frame -
1817 dummy frame PC's typically land in the entry func. Don't apply
1818 this test to the sentinel frame. Sentinel frames should always
1819 be allowed to unwind. */
1820 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1821 hard evidence that this is needed. */
1822 /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't
1823 checking for "main" in the minimal symbols. With that fixed
1824 asm-source tests now stop in "main" instead of halting the
1825 backtrace in wierd and wonderful ways somewhere inside the entry
1826 file. Suspect that deprecated_inside_entry_file and
1827 inside_entry_func tests were added to work around that (now
1829 /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right)
1830 suggested having the inside_entry_func test use the
1831 inside_main_func msymbol trick (along with entry_point_address I
1832 guess) to determine the address range of the start function.
1833 That should provide a far better stopper than the current
1835 /* NOTE: cagney/2003-07-15: Need to add a "set backtrace
1836 beyond-entry-func" command so that this can be selectively
1840 && backtrace_beyond_entry_func
1842 && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
1843 && inside_entry_func (this_frame))
1847 fprintf_unfiltered (gdb_stdlog, "-> ");
1848 fprint_frame (gdb_stdlog, NULL);
1849 fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n");
1854 /* Only try to do the unwind once. */
1855 if (this_frame->prev_p)
1859 fprintf_unfiltered (gdb_stdlog, "-> ");
1860 fprint_frame (gdb_stdlog, this_frame->prev);
1861 fprintf_unfiltered (gdb_stdlog, " // cached \n");
1863 return this_frame->prev;
1865 this_frame->prev_p = 1;
1867 /* If we're inside the entry file, it isn't valid. Don't apply this
1868 test to a dummy frame - dummy frame PC's typically land in the
1869 entry file. Don't apply this test to the sentinel frame.
1870 Sentinel frames should always be allowed to unwind. */
1871 /* NOTE: drow/2002-12-25: should there be a way to disable this
1872 check? It assumes a single small entry file, and the way some
1873 debug readers (e.g. dbxread) figure out which object is the
1874 entry file is somewhat hokey. */
1875 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1876 then it should probably be moved to before the ->prev_p test,
1878 /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call
1879 to deprecated_inside_entry_file destroys a meaningful backtrace
1880 under some conditions. E. g. the backtrace tests in the
1881 asm-source testcase are broken for some targets. In this test
1882 the functions are all implemented as part of one file and the
1883 testcase is not necessarily linked with a start file (depending
1884 on the target). What happens is, that the first frame is printed
1885 normaly and following frames are treated as being inside the
1886 enttry file then. This way, only the #0 frame is printed in the
1887 backtrace output. */
1889 && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
1890 && deprecated_inside_entry_file (get_frame_pc (this_frame)))
1894 fprintf_unfiltered (gdb_stdlog, "-> ");
1895 fprint_frame (gdb_stdlog, NULL);
1896 fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n");
1901 /* If any of the old frame initialization methods are around, use
1902 the legacy get_prev_frame method. */
1903 if (legacy_frame_p (current_gdbarch))
1905 prev_frame = legacy_get_prev_frame (this_frame);
1909 /* Check that this frame's ID was valid. If it wasn't, don't try to
1910 unwind to the prev frame. Be careful to not apply this test to
1911 the sentinel frame. */
1912 if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame)))
1916 fprintf_unfiltered (gdb_stdlog, "-> ");
1917 fprint_frame (gdb_stdlog, NULL);
1918 fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n");
1923 /* Check that this frame's ID isn't inner to (younger, below, next)
1924 the next frame. This happens when a frame unwind goes backwards.
1925 Since the sentinel frame doesn't really exist, don't compare the
1926 inner-most against that sentinel. */
1927 if (this_frame->level > 0
1928 && frame_id_inner (get_frame_id (this_frame),
1929 get_frame_id (this_frame->next)))
1930 error ("Previous frame inner to this frame (corrupt stack?)");
1932 /* Check that this and the next frame are not identical. If they
1933 are, there is most likely a stack cycle. As with the inner-than
1934 test above, avoid comparing the inner-most and sentinel frames. */
1935 if (this_frame->level > 0
1936 && frame_id_eq (get_frame_id (this_frame),
1937 get_frame_id (this_frame->next)))
1938 error ("Previous frame identical to this frame (corrupt stack?)");
1940 /* Allocate the new frame but do not wire it in to the frame chain.
1941 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1942 frame->next to pull some fancy tricks (of course such code is, by
1943 definition, recursive). Try to prevent it.
1945 There is no reason to worry about memory leaks, should the
1946 remainder of the function fail. The allocated memory will be
1947 quickly reclaimed when the frame cache is flushed, and the `we've
1948 been here before' check above will stop repeated memory
1949 allocation calls. */
1950 prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
1951 prev_frame->level = this_frame->level + 1;
1953 /* Don't yet compute ->unwind (and hence ->type). It is computed
1954 on-demand in get_frame_type, frame_register_unwind, and
1957 /* Don't yet compute the frame's ID. It is computed on-demand by
1960 /* The unwound frame ID is validate at the start of this function,
1961 as part of the logic to decide if that frame should be further
1962 unwound, and not here while the prev frame is being created.
1963 Doing this makes it possible for the user to examine a frame that
1964 has an invalid frame ID.
1966 Some very old VAX code noted: [...] For the sake of argument,
1967 suppose that the stack is somewhat trashed (which is one reason
1968 that "info frame" exists). So, return 0 (indicating we don't
1969 know the address of the arglist) if we don't know what frame this
1973 this_frame->prev = prev_frame;
1974 prev_frame->next = this_frame;
1978 fprintf_unfiltered (gdb_stdlog, "-> ");
1979 fprint_frame (gdb_stdlog, prev_frame);
1980 fprintf_unfiltered (gdb_stdlog, " }\n");
1987 get_frame_pc (struct frame_info *frame)
1989 gdb_assert (frame->next != NULL);
1990 return frame_pc_unwind (frame->next);
1993 /* Return an address of that falls within the frame's code block. */
1996 frame_unwind_address_in_block (struct frame_info *next_frame)
1998 /* A draft address. */
1999 CORE_ADDR pc = frame_pc_unwind (next_frame);
2001 /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel),
2002 and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS
2003 frame's PC ends up pointing at the instruction fallowing the
2004 "call". Adjust that PC value so that it falls on the call
2005 instruction (which, hopefully, falls within THIS frame's code
2006 block. So far it's proved to be a very good approximation. See
2007 get_frame_type for why ->type can't be used. */
2008 if (next_frame->level >= 0
2009 && get_frame_type (next_frame) == NORMAL_FRAME)
2015 get_frame_address_in_block (struct frame_info *this_frame)
2017 return frame_unwind_address_in_block (this_frame->next);
2021 pc_notcurrent (struct frame_info *frame)
2023 /* If FRAME is not the innermost frame, that normally means that
2024 FRAME->pc points at the return instruction (which is *after* the
2025 call instruction), and we want to get the line containing the
2026 call (because the call is where the user thinks the program is).
2027 However, if the next frame is either a SIGTRAMP_FRAME or a
2028 DUMMY_FRAME, then the next frame will contain a saved interrupt
2029 PC and such a PC indicates the current (rather than next)
2030 instruction/line, consequently, for such cases, want to get the
2031 line containing fi->pc. */
2032 struct frame_info *next = get_next_frame (frame);
2033 int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME);
2038 find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
2040 (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame));
2043 /* Per "frame.h", return the ``address'' of the frame. Code should
2044 really be using get_frame_id(). */
2046 get_frame_base (struct frame_info *fi)
2048 return get_frame_id (fi).stack_addr;
2051 /* High-level offsets into the frame. Used by the debug info. */
2054 get_frame_base_address (struct frame_info *fi)
2056 if (get_frame_type (fi) != NORMAL_FRAME)
2058 if (fi->base == NULL)
2059 fi->base = frame_base_find_by_frame (fi->next);
2060 /* Sneaky: If the low-level unwind and high-level base code share a
2061 common unwinder, let them share the prologue cache. */
2062 if (fi->base->unwind == fi->unwind)
2063 return fi->base->this_base (fi->next, &fi->prologue_cache);
2064 return fi->base->this_base (fi->next, &fi->base_cache);
2068 get_frame_locals_address (struct frame_info *fi)
2071 if (get_frame_type (fi) != NORMAL_FRAME)
2073 /* If there isn't a frame address method, find it. */
2074 if (fi->base == NULL)
2075 fi->base = frame_base_find_by_frame (fi->next);
2076 /* Sneaky: If the low-level unwind and high-level base code share a
2077 common unwinder, let them share the prologue cache. */
2078 if (fi->base->unwind == fi->unwind)
2079 cache = &fi->prologue_cache;
2081 cache = &fi->base_cache;
2082 return fi->base->this_locals (fi->next, cache);
2086 get_frame_args_address (struct frame_info *fi)
2089 if (get_frame_type (fi) != NORMAL_FRAME)
2091 /* If there isn't a frame address method, find it. */
2092 if (fi->base == NULL)
2093 fi->base = frame_base_find_by_frame (fi->next);
2094 /* Sneaky: If the low-level unwind and high-level base code share a
2095 common unwinder, let them share the prologue cache. */
2096 if (fi->base->unwind == fi->unwind)
2097 cache = &fi->prologue_cache;
2099 cache = &fi->base_cache;
2100 return fi->base->this_args (fi->next, cache);
2103 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
2104 or -1 for a NULL frame. */
2107 frame_relative_level (struct frame_info *fi)
2116 get_frame_type (struct frame_info *frame)
2118 /* Some targets still don't use [generic] dummy frames. Catch them
2120 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
2121 && deprecated_frame_in_dummy (frame))
2124 /* Some legacy code, e.g, mips_init_extra_frame_info() wants
2125 to determine the frame's type prior to it being completely
2126 initialized. Don't attempt to lazily initialize ->unwind for
2127 legacy code. It will be initialized in legacy_get_prev_frame(). */
2128 if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch))
2130 /* Initialize the frame's unwinder because it is that which
2131 provides the frame's type. */
2132 frame->unwind = frame_unwind_find_by_frame (frame->next,
2133 &frame->prologue_cache);
2134 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
2135 type in the frame, the unwinder's type should be returned
2136 directly. Unfortunately, legacy code, called by
2137 legacy_get_prev_frame, explicitly set the frames type using
2138 the method deprecated_set_frame_type(). */
2139 frame->type = frame->unwind->type;
2141 if (frame->type == UNKNOWN_FRAME)
2142 return NORMAL_FRAME;
2148 deprecated_set_frame_type (struct frame_info *frame, enum frame_type type)
2150 /* Arrrg! See comment in "frame.h". */
2154 struct frame_extra_info *
2155 get_frame_extra_info (struct frame_info *fi)
2157 return fi->extra_info;
2160 struct frame_extra_info *
2161 frame_extra_info_zalloc (struct frame_info *fi, long size)
2163 fi->extra_info = frame_obstack_zalloc (size);
2164 return fi->extra_info;
2168 deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc)
2171 fprintf_unfiltered (gdb_stdlog,
2172 "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
2173 frame->level, paddr_nz (pc));
2174 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
2175 maintaining a locally allocated frame object. Since such frame's
2176 are not in the frame chain, it isn't possible to assume that the
2177 frame has a next. Sigh. */
2178 if (frame->next != NULL)
2180 /* While we're at it, update this frame's cached PC value, found
2181 in the next frame. Oh for the day when "struct frame_info"
2182 is opaque and this hack on hack can just go away. */
2183 frame->next->prev_pc.value = pc;
2184 frame->next->prev_pc.p = 1;
2189 deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base)
2192 fprintf_unfiltered (gdb_stdlog,
2193 "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n",
2194 frame->level, paddr_nz (base));
2195 /* See comment in "frame.h". */
2196 frame->this_id.value.stack_addr = base;
2200 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
2201 long sizeof_extra_info)
2203 struct frame_info *frame = XMALLOC (struct frame_info);
2204 memset (frame, 0, sizeof (*frame));
2205 frame->this_id.p = 1;
2206 make_cleanup (xfree, frame);
2207 if (sizeof_saved_regs > 0)
2209 frame->saved_regs = xcalloc (1, sizeof_saved_regs);
2210 make_cleanup (xfree, frame->saved_regs);
2212 if (sizeof_extra_info > 0)
2214 frame->extra_info = xcalloc (1, sizeof_extra_info);
2215 make_cleanup (xfree, frame->extra_info);
2220 /* Memory access methods. */
2223 get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf,
2226 read_memory (addr, buf, len);
2230 get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr,
2233 return read_memory_integer (addr, len);
2237 get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr,
2240 return read_memory_unsigned_integer (addr, len);
2243 /* Architecture method. */
2246 get_frame_arch (struct frame_info *this_frame)
2248 return current_gdbarch;
2251 /* Stack pointer methods. */
2254 get_frame_sp (struct frame_info *this_frame)
2256 return frame_sp_unwind (this_frame->next);
2260 frame_sp_unwind (struct frame_info *next_frame)
2262 /* Normality, an architecture that provides a way of obtaining any
2263 frame inner-most address. */
2264 if (gdbarch_unwind_sp_p (current_gdbarch))
2265 return gdbarch_unwind_sp (current_gdbarch, next_frame);
2266 /* Things are looking grim. If it's the inner-most frame and there
2267 is a TARGET_READ_SP then that can be used. */
2268 if (next_frame->level < 0 && TARGET_READ_SP_P ())
2269 return TARGET_READ_SP ();
2270 /* Now things are really are grim. Hope that the value returned by
2271 the SP_REGNUM register is meaningful. */
2275 frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp);
2278 internal_error (__FILE__, __LINE__, "Missing unwind SP method");
2283 legacy_frame_p (struct gdbarch *current_gdbarch)
2285 if (DEPRECATED_INIT_FRAME_PC_P ()
2286 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
2287 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
2288 || DEPRECATED_FRAME_CHAIN_P ())
2289 /* No question, it's a legacy frame. */
2291 if (gdbarch_unwind_dummy_id_p (current_gdbarch))
2292 /* No question, it's not a legacy frame (provided none of the
2293 deprecated methods checked above are present that is). */
2295 if (DEPRECATED_TARGET_READ_FP_P ()
2296 || DEPRECATED_FP_REGNUM >= 0)
2297 /* Assume it's legacy. If you're trying to convert a legacy frame
2298 target to the new mechanism, get rid of these. legacy
2299 get_prev_frame requires these when unwind_frame_id isn't
2302 /* Default to assuming that it's brand new code, and hence not
2303 legacy. Force it down the non-legacy path so that the new code
2304 uses the new frame mechanism from day one. Dummy frame's won't
2305 work very well but we can live with that. */
2309 extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */
2311 static struct cmd_list_element *set_backtrace_cmdlist;
2312 static struct cmd_list_element *show_backtrace_cmdlist;
2315 set_backtrace_cmd (char *args, int from_tty)
2317 help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout);
2321 show_backtrace_cmd (char *args, int from_tty)
2323 cmd_show_list (show_backtrace_cmdlist, from_tty, "");
2327 _initialize_frame (void)
2329 obstack_init (&frame_cache_obstack);
2331 add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\
2332 Set backtrace specific variables.\n\
2333 Configure backtrace variables such as the backtrace limit",
2334 &set_backtrace_cmdlist, "set backtrace ",
2335 0/*allow-unknown*/, &setlist);
2336 add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\
2337 Show backtrace specific variables\n\
2338 Show backtrace variables such as the backtrace limit",
2339 &show_backtrace_cmdlist, "show backtrace ",
2340 0/*allow-unknown*/, &showlist);
2342 add_setshow_boolean_cmd ("past-main", class_obscure,
2343 &backtrace_past_main, "\
2344 Set whether backtraces should continue past \"main\".\n\
2345 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2346 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2347 of the stack trace.", "\
2348 Show whether backtraces should continue past \"main\".\n\
2349 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2350 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2351 of the stack trace.",
2352 NULL, NULL, &set_backtrace_cmdlist,
2353 &show_backtrace_cmdlist);
2355 add_setshow_uinteger_cmd ("limit", class_obscure,
2356 &backtrace_limit, "\
2357 Set an upper bound on the number of backtrace levels.\n\
2358 No more than the specified number of frames can be displayed or examined.\n\
2359 Zero is unlimited.", "\
2360 Show the upper bound on the number of backtrace levels.",
2361 NULL, NULL, &set_backtrace_cmdlist,
2362 &show_backtrace_cmdlist);
2364 /* Debug this files internals. */
2365 add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger,
2366 &frame_debug, "Set frame debugging.\n\
2367 When non-zero, frame specific internal debugging is enabled.", &setdebuglist),