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;
139 int (*frame_tdep_pc_fixup)(CORE_ADDR *pc);
142 fprint_frame_id (struct ui_file *file, struct frame_id id)
144 fprintf_unfiltered (file, "{stack=0x%s,code=0x%s,special=0x%s}",
145 paddr_nz (id.stack_addr),
146 paddr_nz (id.code_addr),
147 paddr_nz (id.special_addr));
151 fprint_frame_type (struct ui_file *file, enum frame_type type)
156 fprintf_unfiltered (file, "UNKNOWN_FRAME");
159 fprintf_unfiltered (file, "NORMAL_FRAME");
162 fprintf_unfiltered (file, "DUMMY_FRAME");
165 fprintf_unfiltered (file, "SIGTRAMP_FRAME");
168 fprintf_unfiltered (file, "<unknown type>");
174 fprint_frame (struct ui_file *file, struct frame_info *fi)
178 fprintf_unfiltered (file, "<NULL frame>");
181 fprintf_unfiltered (file, "{");
182 fprintf_unfiltered (file, "level=%d", fi->level);
183 fprintf_unfiltered (file, ",");
184 fprintf_unfiltered (file, "type=");
185 fprint_frame_type (file, fi->type);
186 fprintf_unfiltered (file, ",");
187 fprintf_unfiltered (file, "unwind=");
188 if (fi->unwind != NULL)
189 gdb_print_host_address (fi->unwind, file);
191 fprintf_unfiltered (file, "<unknown>");
192 fprintf_unfiltered (file, ",");
193 fprintf_unfiltered (file, "pc=");
194 if (fi->next != NULL && fi->next->prev_pc.p)
195 fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_pc.value));
197 fprintf_unfiltered (file, "<unknown>");
198 fprintf_unfiltered (file, ",");
199 fprintf_unfiltered (file, "id=");
201 fprint_frame_id (file, fi->this_id.value);
203 fprintf_unfiltered (file, "<unknown>");
204 fprintf_unfiltered (file, ",");
205 fprintf_unfiltered (file, "func=");
206 if (fi->next != NULL && fi->next->prev_func.p)
207 fprintf_unfiltered (file, "0x%s", paddr_nz (fi->next->prev_func.addr));
209 fprintf_unfiltered (file, "<unknown>");
210 fprintf_unfiltered (file, "}");
213 /* Return a frame uniq ID that can be used to, later, re-find the
217 get_frame_id (struct frame_info *fi)
221 return null_frame_id;
225 gdb_assert (!legacy_frame_p (current_gdbarch));
227 fprintf_unfiltered (gdb_stdlog, "{ get_frame_id (fi=%d) ",
229 /* Find the unwinder. */
230 if (fi->unwind == NULL)
232 fi->unwind = frame_unwind_find_by_frame (fi->next);
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 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
538 type in the frame, the unwinder's type should be returned
539 directly. Unfortunately, legacy code, called by
540 legacy_get_prev_frame, explicitly set the frames type using
541 the method deprecated_set_frame_type(). */
542 frame->type = frame->unwind->type;
545 /* Ask this frame to unwind its register. See comment in
546 "frame-unwind.h" for why NEXT frame and this unwind cace are
548 frame->unwind->prev_register (frame->next, &frame->prologue_cache, regnum,
549 optimizedp, lvalp, addrp, realnump, bufferp);
553 fprintf_unfiltered (gdb_stdlog, "->");
554 fprintf_unfiltered (gdb_stdlog, " *optimizedp=%d", (*optimizedp));
555 fprintf_unfiltered (gdb_stdlog, " *lvalp=%d", (int) (*lvalp));
556 fprintf_unfiltered (gdb_stdlog, " *addrp=0x%s", paddr_nz ((*addrp)));
557 fprintf_unfiltered (gdb_stdlog, " *bufferp=");
559 fprintf_unfiltered (gdb_stdlog, "<NULL>");
563 const unsigned char *buf = bufferp;
564 fprintf_unfiltered (gdb_stdlog, "[");
565 for (i = 0; i < register_size (current_gdbarch, regnum); i++)
566 fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
567 fprintf_unfiltered (gdb_stdlog, "]");
569 fprintf_unfiltered (gdb_stdlog, " }\n");
574 frame_register (struct frame_info *frame, int regnum,
575 int *optimizedp, enum lval_type *lvalp,
576 CORE_ADDR *addrp, int *realnump, void *bufferp)
578 /* Require all but BUFFERP to be valid. A NULL BUFFERP indicates
579 that the value proper does not need to be fetched. */
580 gdb_assert (optimizedp != NULL);
581 gdb_assert (lvalp != NULL);
582 gdb_assert (addrp != NULL);
583 gdb_assert (realnump != NULL);
584 /* gdb_assert (bufferp != NULL); */
586 /* Ulgh! Old code that, for lval_register, sets ADDRP to the offset
587 of the register in the register cache. It should instead return
588 the REGNUM corresponding to that register. Translate the . */
589 if (DEPRECATED_GET_SAVED_REGISTER_P ())
591 DEPRECATED_GET_SAVED_REGISTER (bufferp, optimizedp, addrp, frame,
593 /* Compute the REALNUM if the caller wants it. */
594 if (*lvalp == lval_register)
597 for (regnum = 0; regnum < NUM_REGS + NUM_PSEUDO_REGS; regnum++)
599 if (*addrp == register_offset_hack (current_gdbarch, regnum))
605 internal_error (__FILE__, __LINE__,
606 "Failed to compute the register number corresponding"
607 " to 0x%s", paddr_d (*addrp));
613 /* Obtain the register value by unwinding the register from the next
614 (more inner frame). */
615 gdb_assert (frame != NULL && frame->next != NULL);
616 frame_register_unwind (frame->next, regnum, optimizedp, lvalp, addrp,
621 frame_unwind_register (struct frame_info *frame, int regnum, void *buf)
627 frame_register_unwind (frame, regnum, &optimized, &lval, &addr,
632 get_frame_register (struct frame_info *frame,
633 int regnum, void *buf)
635 frame_unwind_register (frame->next, regnum, buf);
639 frame_unwind_register_signed (struct frame_info *frame, int regnum)
641 char buf[MAX_REGISTER_SIZE];
642 frame_unwind_register (frame, regnum, buf);
643 return extract_signed_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
647 get_frame_register_signed (struct frame_info *frame, int regnum)
649 return frame_unwind_register_signed (frame->next, regnum);
653 frame_unwind_register_unsigned (struct frame_info *frame, int regnum)
655 char buf[MAX_REGISTER_SIZE];
656 frame_unwind_register (frame, regnum, buf);
657 return extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
661 get_frame_register_unsigned (struct frame_info *frame, int regnum)
663 return frame_unwind_register_unsigned (frame->next, regnum);
667 frame_unwind_unsigned_register (struct frame_info *frame, int regnum,
670 char buf[MAX_REGISTER_SIZE];
671 frame_unwind_register (frame, regnum, buf);
672 (*val) = extract_unsigned_integer (buf, DEPRECATED_REGISTER_VIRTUAL_SIZE (regnum));
676 put_frame_register (struct frame_info *frame, int regnum, const void *buf)
678 struct gdbarch *gdbarch = get_frame_arch (frame);
683 frame_register (frame, regnum, &optim, &lval, &addr, &realnum, NULL);
685 error ("Attempt to assign to a value that was optimized out.");
690 /* FIXME: write_memory doesn't yet take constant buffers.
692 char tmp[MAX_REGISTER_SIZE];
693 memcpy (tmp, buf, register_size (gdbarch, regnum));
694 write_memory (addr, tmp, register_size (gdbarch, regnum));
698 regcache_cooked_write (current_regcache, realnum, buf);
701 error ("Attempt to assign to an unmodifiable value.");
705 /* frame_register_read ()
707 Find and return the value of REGNUM for the specified stack frame.
708 The number of bytes copied is DEPRECATED_REGISTER_RAW_SIZE
711 Returns 0 if the register value could not be found. */
714 frame_register_read (struct frame_info *frame, int regnum, void *myaddr)
720 frame_register (frame, regnum, &optimized, &lval, &addr, &realnum, myaddr);
722 /* FIXME: cagney/2002-05-15: This test, is just bogus.
724 It indicates that the target failed to supply a value for a
725 register because it was "not available" at this time. Problem
726 is, the target still has the register and so get saved_register()
727 may be returning a value saved on the stack. */
729 if (register_cached (regnum) < 0)
730 return 0; /* register value not available */
736 /* Map between a frame register number and its name. A frame register
737 space is a superset of the cooked register space --- it also
738 includes builtin registers. */
741 frame_map_name_to_regnum (struct frame_info *frame, const char *name, int len)
743 return user_reg_map_name_to_regnum (get_frame_arch (frame), name, len);
747 frame_map_regnum_to_name (struct frame_info *frame, int regnum)
749 return user_reg_map_regnum_to_name (get_frame_arch (frame), regnum);
752 /* Create a sentinel frame. */
754 static struct frame_info *
755 create_sentinel_frame (struct regcache *regcache)
757 struct frame_info *frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
758 frame->type = NORMAL_FRAME;
760 /* Explicitly initialize the sentinel frame's cache. Provide it
761 with the underlying regcache. In the future additional
762 information, such as the frame's thread will be added. */
763 frame->prologue_cache = sentinel_frame_cache (regcache);
764 /* For the moment there is only one sentinel frame implementation. */
765 frame->unwind = sentinel_frame_unwind;
766 /* Link this frame back to itself. The frame is self referential
767 (the unwound PC is the same as the pc), so make it so. */
769 /* Make the sentinel frame's ID valid, but invalid. That way all
770 comparisons with it should fail. */
771 frame->this_id.p = 1;
772 frame->this_id.value = null_frame_id;
775 fprintf_unfiltered (gdb_stdlog, "{ create_sentinel_frame (...) -> ");
776 fprint_frame (gdb_stdlog, frame);
777 fprintf_unfiltered (gdb_stdlog, " }\n");
782 /* Info about the innermost stack frame (contents of FP register) */
784 static struct frame_info *current_frame;
786 /* Cache for frame addresses already read by gdb. Valid only while
787 inferior is stopped. Control variables for the frame cache should
788 be local to this module. */
790 static struct obstack frame_cache_obstack;
793 frame_obstack_zalloc (unsigned long size)
795 void *data = obstack_alloc (&frame_cache_obstack, size);
796 memset (data, 0, size);
801 frame_saved_regs_zalloc (struct frame_info *fi)
803 fi->saved_regs = (CORE_ADDR *)
804 frame_obstack_zalloc (SIZEOF_FRAME_SAVED_REGS);
805 return fi->saved_regs;
809 deprecated_get_frame_saved_regs (struct frame_info *fi)
811 return fi->saved_regs;
814 /* Return the innermost (currently executing) stack frame. This is
815 split into two functions. The function unwind_to_current_frame()
816 is wrapped in catch exceptions so that, even when the unwind of the
817 sentinel frame fails, the function still returns a stack frame. */
820 unwind_to_current_frame (struct ui_out *ui_out, void *args)
822 struct frame_info *frame = get_prev_frame (args);
823 /* A sentinel frame can fail to unwind, eg, because it's PC value
824 lands in somewhere like start. */
827 current_frame = frame;
832 get_current_frame (void)
834 /* First check, and report, the lack of registers. Having GDB
835 report "No stack!" or "No memory" when the target doesn't even
836 have registers is very confusing. Besides, "printcmd.exp"
837 explicitly checks that ``print $pc'' with no registers prints "No
839 if (!target_has_registers)
840 error ("No registers.");
841 if (!target_has_stack)
843 if (!target_has_memory)
844 error ("No memory.");
845 if (current_frame == NULL)
847 struct frame_info *sentinel_frame =
848 create_sentinel_frame (current_regcache);
849 if (catch_exceptions (uiout, unwind_to_current_frame, sentinel_frame,
850 NULL, RETURN_MASK_ERROR) != 0)
852 /* Oops! Fake a current frame? Is this useful? It has a PC
853 of zero, for instance. */
854 current_frame = sentinel_frame;
857 return current_frame;
860 /* The "selected" stack frame is used by default for local and arg
861 access. May be zero, for no selected frame. */
863 struct frame_info *deprecated_selected_frame;
865 /* Return the selected frame. Always non-null (unless there isn't an
866 inferior sufficient for creating a frame) in which case an error is
870 get_selected_frame (void)
872 if (deprecated_selected_frame == NULL)
873 /* Hey! Don't trust this. It should really be re-finding the
874 last selected frame of the currently selected thread. This,
875 though, is better than nothing. */
876 select_frame (get_current_frame ());
877 /* There is always a frame. */
878 gdb_assert (deprecated_selected_frame != NULL);
879 return deprecated_selected_frame;
882 /* This is a variant of get_selected_frame which can be called when
883 the inferior does not have a frame; in that case it will return
884 NULL instead of calling error (). */
887 deprecated_safe_get_selected_frame (void)
889 if (!target_has_registers || !target_has_stack || !target_has_memory)
891 return get_selected_frame ();
894 /* Select frame FI (or NULL - to invalidate the current frame). */
897 select_frame (struct frame_info *fi)
901 deprecated_selected_frame = fi;
902 /* NOTE: cagney/2002-05-04: FI can be NULL. This occures when the
903 frame is being invalidated. */
904 if (selected_frame_level_changed_hook)
905 selected_frame_level_changed_hook (frame_relative_level (fi));
907 /* FIXME: kseitz/2002-08-28: It would be nice to call
908 selected_frame_level_changed_event right here, but due to limitations
909 in the current interfaces, we would end up flooding UIs with events
910 because select_frame is used extensively internally.
912 Once we have frame-parameterized frame (and frame-related) commands,
913 the event notification can be moved here, since this function will only
914 be called when the users selected frame is being changed. */
916 /* Ensure that symbols for this frame are read in. Also, determine the
917 source language of this frame, and switch to it if desired. */
920 /* We retrieve the frame's symtab by using the frame PC. However
921 we cannot use the frame pc as is, because it usually points to
922 the instruction following the "call", which is sometimes the
923 first instruction of another function. So we rely on
924 get_frame_address_in_block() which provides us with a PC which
925 is guaranteed to be inside the frame's code block. */
926 s = find_pc_symtab (get_frame_address_in_block (fi));
928 && s->language != current_language->la_language
929 && s->language != language_unknown
930 && language_mode == language_mode_auto)
932 set_language (s->language);
937 /* Return the register saved in the simplistic ``saved_regs'' cache.
938 If the value isn't here AND a value is needed, try the next inner
942 legacy_saved_regs_prev_register (struct frame_info *next_frame,
943 void **this_prologue_cache,
944 int regnum, int *optimizedp,
945 enum lval_type *lvalp, CORE_ADDR *addrp,
946 int *realnump, void *bufferp)
948 /* HACK: New code is passed the next frame and this cache.
949 Unfortunately, old code expects this frame. Since this is a
950 backward compatibility hack, cheat by walking one level along the
951 prologue chain to the frame the old code expects.
953 Do not try this at home. Professional driver, closed course. */
954 struct frame_info *frame = next_frame->prev;
955 gdb_assert (frame != NULL);
957 if (deprecated_get_frame_saved_regs (frame) == NULL)
959 /* If nothing's initialized the saved regs, do it now. */
960 gdb_assert (DEPRECATED_FRAME_INIT_SAVED_REGS_P ());
961 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
962 gdb_assert (deprecated_get_frame_saved_regs (frame) != NULL);
965 if (deprecated_get_frame_saved_regs (frame) != NULL
966 && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
968 if (regnum == SP_REGNUM)
970 /* SP register treated specially. */
976 /* NOTE: cagney/2003-05-09: In-lined store_address with
977 it's body - store_unsigned_integer. */
978 store_unsigned_integer (bufferp, DEPRECATED_REGISTER_RAW_SIZE (regnum),
979 deprecated_get_frame_saved_regs (frame)[regnum]);
983 /* Any other register is saved in memory, fetch it but cache
984 a local copy of its value. */
986 *lvalp = lval_memory;
987 *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
992 /* Save each register value, as it is read in, in a
993 frame based cache. */
994 void **regs = (*this_prologue_cache);
997 int sizeof_cache = ((NUM_REGS + NUM_PSEUDO_REGS)
999 regs = frame_obstack_zalloc (sizeof_cache);
1000 (*this_prologue_cache) = regs;
1002 if (regs[regnum] == NULL)
1005 = frame_obstack_zalloc (DEPRECATED_REGISTER_RAW_SIZE (regnum));
1006 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], regs[regnum],
1007 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1009 memcpy (bufferp, regs[regnum], DEPRECATED_REGISTER_RAW_SIZE (regnum));
1011 /* Read the value in from memory. */
1012 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], bufferp,
1013 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1020 /* No luck. Assume this and the next frame have the same register
1021 value. Pass the unwind request down the frame chain to the next
1022 frame. Hopefully that frame will find the register's location. */
1023 frame_register_unwind (next_frame, regnum, optimizedp, lvalp, addrp,
1028 legacy_saved_regs_this_id (struct frame_info *next_frame,
1029 void **this_prologue_cache,
1030 struct frame_id *id)
1032 /* A developer is trying to bring up a new architecture, help them
1033 by providing a default unwinder that refuses to unwind anything
1034 (the ID is always NULL). In the case of legacy code,
1035 legacy_get_prev_frame() will have previously set ->this_id.p, so
1036 this code won't be called. */
1037 (*id) = null_frame_id;
1040 const struct frame_unwind legacy_saved_regs_unwinder = {
1041 /* Not really. It gets overridden by legacy_get_prev_frame. */
1043 legacy_saved_regs_this_id,
1044 legacy_saved_regs_prev_register
1046 const struct frame_unwind *legacy_saved_regs_unwind = &legacy_saved_regs_unwinder;
1049 /* Function: deprecated_generic_get_saved_register
1050 Find register number REGNUM relative to FRAME and put its (raw,
1051 target format) contents in *RAW_BUFFER.
1053 Set *OPTIMIZED if the variable was optimized out (and thus can't be
1054 fetched). Note that this is never set to anything other than zero
1055 in this implementation.
1057 Set *LVAL to lval_memory, lval_register, or not_lval, depending on
1058 whether the value was fetched from memory, from a register, or in a
1059 strange and non-modifiable way (e.g. a frame pointer which was
1060 calculated rather than fetched). We will use not_lval for values
1061 fetched from generic dummy frames.
1063 Set *ADDRP to the address, either in memory or as a
1064 DEPRECATED_REGISTER_BYTE offset into the registers array. If the
1065 value is stored in a dummy frame, set *ADDRP to zero.
1067 The argument RAW_BUFFER must point to aligned memory. */
1070 deprecated_generic_get_saved_register (char *raw_buffer, int *optimized,
1072 struct frame_info *frame, int regnum,
1073 enum lval_type *lval)
1075 if (!target_has_registers)
1076 error ("No registers.");
1078 /* Normal systems don't optimize out things with register numbers. */
1079 if (optimized != NULL)
1082 if (addrp) /* default assumption: not found in memory */
1085 /* Note: since the current frame's registers could only have been
1086 saved by frames INTERIOR TO the current frame, we skip examining
1087 the current frame itself: otherwise, we would be getting the
1088 previous frame's registers which were saved by the current frame. */
1092 for (frame = get_next_frame (frame);
1093 frame_relative_level (frame) >= 0;
1094 frame = get_next_frame (frame))
1096 if (get_frame_type (frame) == DUMMY_FRAME)
1098 if (lval) /* found it in a CALL_DUMMY frame */
1101 /* FIXME: cagney/2002-06-26: This should be via the
1102 gdbarch_register_read() method so that it, on the
1103 fly, constructs either a raw or pseudo register
1104 from the raw register cache. */
1106 (deprecated_find_dummy_frame_regcache (get_frame_pc (frame),
1107 get_frame_base (frame)),
1108 regnum, raw_buffer);
1112 DEPRECATED_FRAME_INIT_SAVED_REGS (frame);
1113 if (deprecated_get_frame_saved_regs (frame) != NULL
1114 && deprecated_get_frame_saved_regs (frame)[regnum] != 0)
1116 if (lval) /* found it saved on the stack */
1117 *lval = lval_memory;
1118 if (regnum == SP_REGNUM)
1120 if (raw_buffer) /* SP register treated specially */
1121 /* NOTE: cagney/2003-05-09: In-line store_address
1122 with it's body - store_unsigned_integer. */
1123 store_unsigned_integer (raw_buffer,
1124 DEPRECATED_REGISTER_RAW_SIZE (regnum),
1125 deprecated_get_frame_saved_regs (frame)[regnum]);
1129 if (addrp) /* any other register */
1130 *addrp = deprecated_get_frame_saved_regs (frame)[regnum];
1132 read_memory (deprecated_get_frame_saved_regs (frame)[regnum], raw_buffer,
1133 DEPRECATED_REGISTER_RAW_SIZE (regnum));
1140 /* If we get thru the loop to this point, it means the register was
1141 not saved in any frame. Return the actual live-register value. */
1143 if (lval) /* found it in a live register */
1144 *lval = lval_register;
1146 *addrp = DEPRECATED_REGISTER_BYTE (regnum);
1148 deprecated_read_register_gen (regnum, raw_buffer);
1151 /* Determine the frame's type based on its PC. */
1153 static enum frame_type
1154 frame_type_from_pc (CORE_ADDR pc)
1156 /* FIXME: cagney/2002-11-24: Can't yet directly call
1157 pc_in_dummy_frame() as some architectures don't set
1158 PC_IN_CALL_DUMMY() to generic_pc_in_call_dummy() (remember the
1159 latter is implemented by simply calling pc_in_dummy_frame). */
1160 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1161 && DEPRECATED_PC_IN_CALL_DUMMY (pc, 0, 0))
1166 find_pc_partial_function (pc, &name, NULL, NULL);
1167 if (PC_IN_SIGTRAMP (pc, name))
1168 return SIGTRAMP_FRAME;
1170 return NORMAL_FRAME;
1174 /* Create an arbitrary (i.e. address specified by user) or innermost frame.
1175 Always returns a non-NULL value. */
1178 create_new_frame (CORE_ADDR addr, CORE_ADDR pc)
1180 struct frame_info *fi;
1184 fprintf_unfiltered (gdb_stdlog,
1185 "{ create_new_frame (addr=0x%s, pc=0x%s) ",
1186 paddr_nz (addr), paddr_nz (pc));
1189 fi = frame_obstack_zalloc (sizeof (struct frame_info));
1191 fi->next = create_sentinel_frame (current_regcache);
1193 /* Select/initialize both the unwind function and the frame's type
1195 fi->unwind = frame_unwind_find_by_frame (fi->next);
1196 if (fi->unwind->type != UNKNOWN_FRAME)
1197 fi->type = fi->unwind->type;
1199 fi->type = frame_type_from_pc (pc);
1202 deprecated_update_frame_base_hack (fi, addr);
1203 deprecated_update_frame_pc_hack (fi, pc);
1205 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1206 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, fi);
1210 fprintf_unfiltered (gdb_stdlog, "-> ");
1211 fprint_frame (gdb_stdlog, fi);
1212 fprintf_unfiltered (gdb_stdlog, " }\n");
1218 /* Return the frame that THIS_FRAME calls (NULL if THIS_FRAME is the
1219 innermost frame). Be careful to not fall off the bottom of the
1220 frame chain and onto the sentinel frame. */
1223 get_next_frame (struct frame_info *this_frame)
1225 if (this_frame->level > 0)
1226 return this_frame->next;
1231 /* Flush the entire frame cache. */
1234 flush_cached_frames (void)
1236 /* Since we can't really be sure what the first object allocated was */
1237 obstack_free (&frame_cache_obstack, 0);
1238 obstack_init (&frame_cache_obstack);
1240 current_frame = NULL; /* Invalidate cache */
1241 select_frame (NULL);
1242 annotate_frames_invalid ();
1244 fprintf_unfiltered (gdb_stdlog, "{ flush_cached_frames () }\n");
1247 /* Flush the frame cache, and start a new one if necessary. */
1250 reinit_frame_cache (void)
1252 flush_cached_frames ();
1254 /* FIXME: The inferior_ptid test is wrong if there is a corefile. */
1255 if (PIDGET (inferior_ptid) != 0)
1257 select_frame (get_current_frame ());
1261 /* Create the previous frame using the deprecated methods
1262 INIT_EXTRA_INFO, INIT_FRAME_PC and INIT_FRAME_PC_FIRST. */
1264 static struct frame_info *
1265 legacy_get_prev_frame (struct frame_info *this_frame)
1267 CORE_ADDR address = 0;
1268 struct frame_info *prev;
1271 /* Don't frame_debug print legacy_get_prev_frame() here, just
1272 confuses the output. */
1274 /* Allocate the new frame.
1276 There is no reason to worry about memory leaks, should the
1277 remainder of the function fail. The allocated memory will be
1278 quickly reclaimed when the frame cache is flushed, and the `we've
1279 been here before' check, in get_prev_frame will stop repeated
1280 memory allocation calls. */
1281 prev = FRAME_OBSTACK_ZALLOC (struct frame_info);
1282 prev->level = this_frame->level + 1;
1284 /* Do not completely wire it in to the frame chain. Some (bad) code
1285 in INIT_FRAME_EXTRA_INFO tries to look along frame->prev to pull
1286 some fancy tricks (of course such code is, by definition,
1289 On the other hand, methods, such as get_frame_pc() and
1290 get_frame_base() rely on being able to walk along the frame
1291 chain. Make certain that at least they work by providing that
1292 link. Of course things manipulating prev can't go back. */
1293 prev->next = this_frame;
1295 /* NOTE: cagney/2002-11-18: Should have been correctly setting the
1296 frame's type here, before anything else, and not last, at the
1297 bottom of this function. The various
1298 DEPRECATED_INIT_EXTRA_FRAME_INFO, DEPRECATED_INIT_FRAME_PC,
1299 DEPRECATED_INIT_FRAME_PC_FIRST and
1300 DEPRECATED_FRAME_INIT_SAVED_REGS methods are full of work-arounds
1301 that handle the frame not being correctly set from the start.
1302 Unfortunately those same work-arounds rely on the type defaulting
1303 to NORMAL_FRAME. Ulgh! The new frame code does not have this
1305 prev->type = UNKNOWN_FRAME;
1307 /* A legacy frame's ID is always computed here. Mark it as valid. */
1308 prev->this_id.p = 1;
1310 /* Handle sentinel frame unwind as a special case. */
1311 if (this_frame->level < 0)
1313 /* Try to unwind the PC. If that doesn't work, assume we've reached
1314 the oldest frame and simply return. Is there a better sentinal
1315 value? The unwound PC value is then used to initialize the new
1316 previous frame's type.
1318 Note that the pc-unwind is intentionally performed before the
1319 frame chain. This is ok since, for old targets, both
1320 frame_pc_unwind (nee, DEPRECATED_FRAME_SAVED_PC) and
1321 DEPRECATED_FRAME_CHAIN()) assume THIS_FRAME's data structures
1322 have already been initialized (using
1323 DEPRECATED_INIT_EXTRA_FRAME_INFO) and hence the call order
1326 By unwinding the PC first, it becomes possible to, in the case of
1327 a dummy frame, avoid also unwinding the frame ID. This is
1328 because (well ignoring the PPC) a dummy frame can be located
1329 using THIS_FRAME's frame ID. */
1331 deprecated_update_frame_pc_hack (prev, frame_pc_unwind (this_frame));
1332 if (get_frame_pc (prev) == 0)
1334 /* The allocated PREV_FRAME will be reclaimed when the frame
1335 obstack is next purged. */
1338 fprintf_unfiltered (gdb_stdlog, "-> ");
1339 fprint_frame (gdb_stdlog, NULL);
1340 fprintf_unfiltered (gdb_stdlog,
1341 " // unwound legacy PC zero }\n");
1346 /* Set the unwind functions based on that identified PC. Ditto
1347 for the "type" but strongly prefer the unwinder's frame type. */
1348 prev->unwind = frame_unwind_find_by_frame (prev->next);
1349 if (prev->unwind->type == UNKNOWN_FRAME)
1350 prev->type = frame_type_from_pc (get_frame_pc (prev));
1352 prev->type = prev->unwind->type;
1354 /* Find the prev's frame's ID. */
1355 if (prev->type == DUMMY_FRAME
1356 && gdbarch_unwind_dummy_id_p (current_gdbarch))
1358 /* When unwinding a normal frame, the stack structure is
1359 determined by analyzing the frame's function's code (be
1360 it using brute force prologue analysis, or the dwarf2
1361 CFI). In the case of a dummy frame, that simply isn't
1362 possible. The The PC is either the program entry point,
1363 or some random address on the stack. Trying to use that
1364 PC to apply standard frame ID unwind techniques is just
1365 asking for trouble. */
1366 /* Use an architecture specific method to extract the prev's
1367 dummy ID from the next frame. Note that this method uses
1368 frame_register_unwind to obtain the register values
1369 needed to determine the dummy frame's ID. */
1370 prev->this_id.value = gdbarch_unwind_dummy_id (current_gdbarch,
1375 /* We're unwinding a sentinel frame, the PC of which is
1376 pointing at a stack dummy. Fake up the dummy frame's ID
1377 using the same sequence as is found a traditional
1378 unwinder. Once all architectures supply the
1379 unwind_dummy_id method, this code can go away. */
1380 prev->this_id.value = frame_id_build (deprecated_read_fp (),
1384 /* Check that the unwound ID is valid. */
1385 if (!frame_id_p (prev->this_id.value))
1389 fprintf_unfiltered (gdb_stdlog, "-> ");
1390 fprint_frame (gdb_stdlog, NULL);
1391 fprintf_unfiltered (gdb_stdlog,
1392 " // unwound legacy ID invalid }\n");
1397 /* Check that the new frame isn't inner to (younger, below,
1398 next) the old frame. If that happens the frame unwind is
1400 /* FIXME: cagney/2003-02-25: Ignore the sentinel frame since
1401 that doesn't have a valid frame ID. Should instead set the
1402 sentinel frame's frame ID to a `sentinel'. Leave it until
1403 after the switch to storing the frame ID, instead of the
1404 frame base, in the frame object. */
1407 this_frame->prev = prev;
1409 /* FIXME: cagney/2002-01-19: This call will go away. Instead of
1410 initializing extra info, all frames will use the frame_cache
1411 (passed to the unwind functions) to store additional frame
1412 info. Unfortunately legacy targets can't use
1413 legacy_get_prev_frame() to unwind the sentinel frame and,
1414 consequently, are forced to take this code path and rely on
1415 the below call to DEPRECATED_INIT_EXTRA_FRAME_INFO to
1416 initialize the inner-most frame. */
1417 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1419 DEPRECATED_INIT_EXTRA_FRAME_INFO (0, prev);
1422 if (prev->type == NORMAL_FRAME)
1423 prev->this_id.value.code_addr
1424 = get_pc_function_start (prev->this_id.value.code_addr);
1428 fprintf_unfiltered (gdb_stdlog, "-> ");
1429 fprint_frame (gdb_stdlog, prev);
1430 fprintf_unfiltered (gdb_stdlog, " } // legacy innermost frame\n");
1435 /* This code only works on normal frames. A sentinel frame, where
1436 the level is -1, should never reach this code. */
1437 gdb_assert (this_frame->level >= 0);
1439 /* On some machines it is possible to call a function without
1440 setting up a stack frame for it. On these machines, we
1441 define this macro to take two args; a frameinfo pointer
1442 identifying a frame and a variable to set or clear if it is
1443 or isn't leafless. */
1445 /* Still don't want to worry about this except on the innermost
1446 frame. This macro will set FROMLEAF if THIS_FRAME is a frameless
1447 function invocation. */
1448 if (this_frame->level == 0)
1449 /* FIXME: 2002-11-09: Frameless functions can occure anywhere in
1450 the frame chain, not just the inner most frame! The generic,
1451 per-architecture, frame code should handle this and the below
1452 should simply be removed. */
1453 fromleaf = (DEPRECATED_FRAMELESS_FUNCTION_INVOCATION_P ()
1454 && DEPRECATED_FRAMELESS_FUNCTION_INVOCATION (this_frame));
1459 /* A frameless inner-most frame. The `FP' (which isn't an
1460 architecture frame-pointer register!) of the caller is the same
1462 /* FIXME: 2002-11-09: There isn't any reason to special case this
1463 edge condition. Instead the per-architecture code should hande
1465 /* FIXME: cagney/2003-06-16: This returns the inner most stack
1466 address for the previous frame, that, however, is wrong. It
1467 should be the inner most stack address for the previous to
1468 previous frame. This is because it is the previous to previous
1469 frame's innermost stack address that is constant through out
1470 the lifetime of the previous frame (trust me :-). */
1471 address = get_frame_base (this_frame);
1474 /* Two macros defined in tm.h specify the machine-dependent
1475 actions to be performed here.
1477 First, get the frame's chain-pointer.
1479 If that is zero, the frame is the outermost frame or a leaf
1480 called by the outermost frame. This means that if start
1481 calls main without a frame, we'll return 0 (which is fine
1484 Nope; there's a problem. This also returns when the current
1485 routine is a leaf of main. This is unacceptable. We move
1486 this to after the ffi test; I'd rather have backtraces from
1487 start go curfluy than have an abort called from main not show
1489 if (DEPRECATED_FRAME_CHAIN_P ())
1490 address = DEPRECATED_FRAME_CHAIN (this_frame);
1493 /* Someone is part way through coverting an old architecture
1494 to the new frame code. Implement FRAME_CHAIN the way the
1496 /* Find PREV frame's unwinder. */
1497 prev->unwind = frame_unwind_find_by_frame (this_frame->next);
1498 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
1499 type in the frame, the unwinder's type should be returned
1500 directly. Unfortunately, legacy code, called by
1501 legacy_get_prev_frame, explicitly set the frames type
1502 using the method deprecated_set_frame_type(). */
1503 prev->type = prev->unwind->type;
1504 /* Find PREV frame's ID. */
1505 prev->unwind->this_id (this_frame,
1506 &prev->prologue_cache,
1507 &prev->this_id.value);
1508 prev->this_id.p = 1;
1509 address = prev->this_id.value.stack_addr;
1512 if (!legacy_frame_chain_valid (address, this_frame))
1516 fprintf_unfiltered (gdb_stdlog, "-> ");
1517 fprint_frame (gdb_stdlog, NULL);
1518 fprintf_unfiltered (gdb_stdlog,
1519 " // legacy frame chain invalid }\n");
1528 fprintf_unfiltered (gdb_stdlog, "-> ");
1529 fprint_frame (gdb_stdlog, NULL);
1530 fprintf_unfiltered (gdb_stdlog,
1531 " // legacy frame chain NULL }\n");
1536 /* Link in the already allocated prev frame. */
1537 this_frame->prev = prev;
1538 deprecated_update_frame_base_hack (prev, address);
1540 /* This change should not be needed, FIXME! We should determine
1541 whether any targets *need* DEPRECATED_INIT_FRAME_PC to happen
1542 after DEPRECATED_INIT_EXTRA_FRAME_INFO and come up with a simple
1543 way to express what goes on here.
1545 DEPRECATED_INIT_EXTRA_FRAME_INFO is called from two places:
1546 create_new_frame (where the PC is already set up) and here (where
1547 it isn't). DEPRECATED_INIT_FRAME_PC is only called from here,
1548 always after DEPRECATED_INIT_EXTRA_FRAME_INFO.
1550 The catch is the MIPS, where DEPRECATED_INIT_EXTRA_FRAME_INFO
1551 requires the PC value (which hasn't been set yet). Some other
1552 machines appear to require DEPRECATED_INIT_EXTRA_FRAME_INFO
1553 before they can do DEPRECATED_INIT_FRAME_PC. Phoo.
1555 We shouldn't need DEPRECATED_INIT_FRAME_PC_FIRST to add more
1556 complication to an already overcomplicated part of GDB.
1557 gnu@cygnus.com, 15Sep92.
1559 Assuming that some machines need DEPRECATED_INIT_FRAME_PC after
1560 DEPRECATED_INIT_EXTRA_FRAME_INFO, one possible scheme:
1562 SETUP_INNERMOST_FRAME(): Default version is just create_new_frame
1563 (deprecated_read_fp ()), read_pc ()). Machines with extra frame
1564 info would do that (or the local equivalent) and then set the
1567 SETUP_ARBITRARY_FRAME(argc, argv): Only change here is that
1568 create_new_frame would no longer init extra frame info;
1569 SETUP_ARBITRARY_FRAME would have to do that.
1571 INIT_PREV_FRAME(fromleaf, prev) Replace
1572 DEPRECATED_INIT_EXTRA_FRAME_INFO and DEPRECATED_INIT_FRAME_PC.
1573 This should also return a flag saying whether to keep the new
1574 frame, or whether to discard it, because on some machines (e.g.
1575 mips) it is really awkward to have DEPRECATED_FRAME_CHAIN_VALID
1576 called BEFORE DEPRECATED_INIT_EXTRA_FRAME_INFO (there is no good
1577 way to get information deduced in DEPRECATED_FRAME_CHAIN_VALID
1578 into the extra fields of the new frame). std_frame_pc(fromleaf,
1581 This is the default setting for INIT_PREV_FRAME. It just does
1582 what the default DEPRECATED_INIT_FRAME_PC does. Some machines
1583 will call it from INIT_PREV_FRAME (either at the beginning, the
1584 end, or in the middle). Some machines won't use it.
1586 kingdon@cygnus.com, 13Apr93, 31Jan94, 14Dec94. */
1588 /* NOTE: cagney/2002-11-09: Just ignore the above! There is no
1589 reason for things to be this complicated.
1591 The trick is to assume that there is always a frame. Instead of
1592 special casing the inner-most frame, create fake frame
1593 (containing the hardware registers) that is inner to the
1594 user-visible inner-most frame (...) and then unwind from that.
1595 That way architecture code can use use the standard
1596 frame_XX_unwind() functions and not differentiate between the
1597 inner most and any other case.
1599 Since there is always a frame to unwind from, there is always
1600 somewhere (THIS_FRAME) to store all the info needed to construct
1601 a new (previous) frame without having to first create it. This
1602 means that the convolution below - needing to carefully order a
1603 frame's initialization - isn't needed.
1605 The irony here though, is that DEPRECATED_FRAME_CHAIN(), at least
1606 for a more up-to-date architecture, always calls
1607 FRAME_SAVED_PC(), and FRAME_SAVED_PC() computes the PC but
1608 without first needing the frame! Instead of the convolution
1609 below, we could have simply called FRAME_SAVED_PC() and been done
1610 with it! Note that FRAME_SAVED_PC() is being superseed by
1611 frame_pc_unwind() and that function does have somewhere to cache
1614 if (DEPRECATED_INIT_FRAME_PC_FIRST_P ())
1615 deprecated_update_frame_pc_hack (prev,
1616 DEPRECATED_INIT_FRAME_PC_FIRST (fromleaf,
1619 if (DEPRECATED_INIT_EXTRA_FRAME_INFO_P ())
1620 DEPRECATED_INIT_EXTRA_FRAME_INFO (fromleaf, prev);
1622 /* This entry is in the frame queue now, which is good since
1623 FRAME_SAVED_PC may use that queue to figure out its value (see
1624 tm-sparc.h). We want the pc saved in the inferior frame. */
1625 if (DEPRECATED_INIT_FRAME_PC_P ())
1626 deprecated_update_frame_pc_hack (prev,
1627 DEPRECATED_INIT_FRAME_PC (fromleaf,
1630 /* If ->frame and ->pc are unchanged, we are in the process of
1631 getting ourselves into an infinite backtrace. Some architectures
1632 check this in DEPRECATED_FRAME_CHAIN or thereabouts, but it seems
1633 like there is no reason this can't be an architecture-independent
1635 if (get_frame_base (prev) == get_frame_base (this_frame)
1636 && get_frame_pc (prev) == get_frame_pc (this_frame))
1638 this_frame->prev = NULL;
1639 obstack_free (&frame_cache_obstack, prev);
1642 fprintf_unfiltered (gdb_stdlog, "-> ");
1643 fprint_frame (gdb_stdlog, NULL);
1644 fprintf_unfiltered (gdb_stdlog,
1645 " // legacy this.id == prev.id }\n");
1650 /* Initialize the code used to unwind the frame PREV based on the PC
1651 (and probably other architectural information). The PC lets you
1652 check things like the debug info at that point (dwarf2cfi?) and
1653 use that to decide how the frame should be unwound.
1655 If there isn't a FRAME_CHAIN, the code above will have already
1657 if (prev->unwind == NULL)
1658 prev->unwind = frame_unwind_find_by_frame (prev->next);
1660 /* If the unwinder provides a frame type, use it. Otherwize
1661 continue on to that heuristic mess. */
1662 if (prev->unwind->type != UNKNOWN_FRAME)
1664 prev->type = prev->unwind->type;
1665 if (prev->type == NORMAL_FRAME)
1666 /* FIXME: cagney/2003-06-16: would get_frame_pc() be better? */
1667 prev->this_id.value.code_addr
1668 = get_pc_function_start (prev->this_id.value.code_addr);
1671 fprintf_unfiltered (gdb_stdlog, "-> ");
1672 fprint_frame (gdb_stdlog, prev);
1673 fprintf_unfiltered (gdb_stdlog, " } // legacy with unwound type\n");
1678 /* NOTE: cagney/2002-11-18: The code segments, found in
1679 create_new_frame and get_prev_frame(), that initializes the
1680 frames type is subtly different. The latter only updates ->type
1681 when it encounters a SIGTRAMP_FRAME or DUMMY_FRAME. This stops
1682 get_prev_frame() overriding the frame's type when the INIT code
1683 has previously set it. This is really somewhat bogus. The
1684 initialization, as seen in create_new_frame(), should occur
1685 before the INIT function has been called. */
1686 if (DEPRECATED_USE_GENERIC_DUMMY_FRAMES
1687 && (DEPRECATED_PC_IN_CALL_DUMMY_P ()
1688 ? DEPRECATED_PC_IN_CALL_DUMMY (get_frame_pc (prev), 0, 0)
1689 : pc_in_dummy_frame (get_frame_pc (prev))))
1690 prev->type = DUMMY_FRAME;
1693 /* FIXME: cagney/2002-11-10: This should be moved to before the
1694 INIT code above so that the INIT code knows what the frame's
1695 type is (in fact, for a [generic] dummy-frame, the type can
1696 be set and then the entire initialization can be skipped.
1697 Unforunatly, its the INIT code that sets the PC (Hmm, catch
1700 find_pc_partial_function (get_frame_pc (prev), &name, NULL, NULL);
1701 if (PC_IN_SIGTRAMP (get_frame_pc (prev), name))
1702 prev->type = SIGTRAMP_FRAME;
1703 /* FIXME: cagney/2002-11-11: Leave prev->type alone. Some
1704 architectures are forcing the frame's type in INIT so we
1705 don't want to override it here. Remember, NORMAL_FRAME == 0,
1706 so it all works (just :-/). Once this initialization is
1707 moved to the start of this function, all this nastness will
1711 if (prev->type == NORMAL_FRAME)
1712 prev->this_id.value.code_addr
1713 = get_pc_function_start (prev->this_id.value.code_addr);
1717 fprintf_unfiltered (gdb_stdlog, "-> ");
1718 fprint_frame (gdb_stdlog, prev);
1719 fprintf_unfiltered (gdb_stdlog, " } // legacy with confused type\n");
1725 /* Return a structure containing various interesting information
1726 about the frame that called THIS_FRAME. Returns NULL
1727 if there is no such frame.
1729 This function tests some target-independent conditions that should
1730 terminate the frame chain, such as unwinding past main(). It
1731 should not contain any target-dependent tests, such as checking
1732 whether the program-counter is zero. */
1735 get_prev_frame (struct frame_info *this_frame)
1737 struct frame_info *prev_frame;
1741 fprintf_unfiltered (gdb_stdlog, "{ get_prev_frame (this_frame=");
1742 if (this_frame != NULL)
1743 fprintf_unfiltered (gdb_stdlog, "%d", this_frame->level);
1745 fprintf_unfiltered (gdb_stdlog, "<NULL>");
1746 fprintf_unfiltered (gdb_stdlog, ") ");
1749 /* Return the inner-most frame, when the caller passes in NULL. */
1750 /* NOTE: cagney/2002-11-09: Not sure how this would happen. The
1751 caller should have previously obtained a valid frame using
1752 get_selected_frame() and then called this code - only possibility
1753 I can think of is code behaving badly.
1755 NOTE: cagney/2003-01-10: Talk about code behaving badly. Check
1756 block_innermost_frame(). It does the sequence: frame = NULL;
1757 while (1) { frame = get_prev_frame (frame); .... }. Ulgh! Why
1758 it couldn't be written better, I don't know.
1760 NOTE: cagney/2003-01-11: I suspect what is happening is
1761 block_innermost_frame() is, when the target has no state
1762 (registers, memory, ...), still calling this function. The
1763 assumption being that this function will return NULL indicating
1764 that a frame isn't possible, rather than checking that the target
1765 has state and then calling get_current_frame() and
1766 get_prev_frame(). This is a guess mind. */
1767 if (this_frame == NULL)
1769 /* NOTE: cagney/2002-11-09: There was a code segment here that
1770 would error out when CURRENT_FRAME was NULL. The comment
1771 that went with it made the claim ...
1773 ``This screws value_of_variable, which just wants a nice
1774 clean NULL return from block_innermost_frame if there are no
1775 frames. I don't think I've ever seen this message happen
1776 otherwise. And returning NULL here is a perfectly legitimate
1779 Per the above, this code shouldn't even be called with a NULL
1781 return current_frame;
1784 /* There is always a frame. If this assertion fails, suspect that
1785 something should be calling get_selected_frame() or
1786 get_current_frame(). */
1787 gdb_assert (this_frame != NULL);
1789 /* Make sure we pass an address within THIS_FRAME's code block to
1790 inside_main_func. Otherwise, we might stop unwinding at a
1791 function which has a call instruction as its last instruction if
1792 that function immediately precedes main(). */
1793 if (this_frame->level >= 0
1794 && !backtrace_past_main
1795 && inside_main_func (get_frame_address_in_block (this_frame)))
1796 /* Don't unwind past main(), bug always unwind the sentinel frame.
1797 Note, this is done _before_ the frame has been marked as
1798 previously unwound. That way if the user later decides to
1799 allow unwinds past main(), that just happens. */
1802 fprintf_unfiltered (gdb_stdlog, "-> NULL // inside main func }\n");
1806 if (this_frame->level > backtrace_limit)
1808 error ("Backtrace limit of %d exceeded", backtrace_limit);
1811 /* If we're already inside the entry function for the main objfile,
1812 then it isn't valid. Don't apply this test to a dummy frame -
1813 dummy frame PC's typically land in the entry func. Don't apply
1814 this test to the sentinel frame. Sentinel frames should always
1815 be allowed to unwind. */
1816 /* NOTE: cagney/2003-02-25: Don't enable until someone has found
1817 hard evidence that this is needed. */
1818 /* NOTE: cagney/2003-07-07: Fixed a bug in inside_main_func - wasn't
1819 checking for "main" in the minimal symbols. With that fixed
1820 asm-source tests now stop in "main" instead of halting the
1821 backtrace in wierd and wonderful ways somewhere inside the entry
1822 file. Suspect that deprecated_inside_entry_file and
1823 inside_entry_func tests were added to work around that (now
1825 /* NOTE: cagney/2003-07-15: danielj (if I'm reading it right)
1826 suggested having the inside_entry_func test use the
1827 inside_main_func msymbol trick (along with entry_point_address I
1828 guess) to determine the address range of the start function.
1829 That should provide a far better stopper than the current
1831 /* NOTE: cagney/2003-07-15: Need to add a "set backtrace
1832 beyond-entry-func" command so that this can be selectively
1836 && backtrace_beyond_entry_func
1838 && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
1839 && inside_entry_func (this_frame))
1843 fprintf_unfiltered (gdb_stdlog, "-> ");
1844 fprint_frame (gdb_stdlog, NULL);
1845 fprintf_unfiltered (gdb_stdlog, "// inside entry func }\n");
1850 /* Assume that the only way to get a zero PC is through something
1851 like a SIGSEGV or a dummy frame, and hence that NORMAL frames
1852 will never unwind a zero PC. */
1853 if (this_frame->level > 0
1854 && get_frame_type (this_frame) == NORMAL_FRAME
1855 && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME
1856 && get_frame_pc (this_frame) == 0)
1860 fprintf_unfiltered (gdb_stdlog, "-> ");
1861 fprint_frame (gdb_stdlog, this_frame->prev);
1862 fprintf_unfiltered (gdb_stdlog, " // zero PC \n");
1867 /* Only try to do the unwind once. */
1868 if (this_frame->prev_p)
1872 fprintf_unfiltered (gdb_stdlog, "-> ");
1873 fprint_frame (gdb_stdlog, this_frame->prev);
1874 fprintf_unfiltered (gdb_stdlog, " // cached \n");
1876 return this_frame->prev;
1878 this_frame->prev_p = 1;
1880 /* If we're inside the entry file, it isn't valid. Don't apply this
1881 test to a dummy frame - dummy frame PC's typically land in the
1882 entry file. Don't apply this test to the sentinel frame.
1883 Sentinel frames should always be allowed to unwind. */
1884 /* NOTE: drow/2002-12-25: should there be a way to disable this
1885 check? It assumes a single small entry file, and the way some
1886 debug readers (e.g. dbxread) figure out which object is the
1887 entry file is somewhat hokey. */
1888 /* NOTE: cagney/2003-01-10: If there is a way of disabling this test
1889 then it should probably be moved to before the ->prev_p test,
1891 /* NOTE: vinschen/2003-04-01: Disabled. It turns out that the call
1892 to deprecated_inside_entry_file destroys a meaningful backtrace
1893 under some conditions. E. g. the backtrace tests in the
1894 asm-source testcase are broken for some targets. In this test
1895 the functions are all implemented as part of one file and the
1896 testcase is not necessarily linked with a start file (depending
1897 on the target). What happens is, that the first frame is printed
1898 normaly and following frames are treated as being inside the
1899 enttry file then. This way, only the #0 frame is printed in the
1900 backtrace output. */
1902 && this_frame->type != DUMMY_FRAME && this_frame->level >= 0
1903 && deprecated_inside_entry_file (get_frame_pc (this_frame)))
1907 fprintf_unfiltered (gdb_stdlog, "-> ");
1908 fprint_frame (gdb_stdlog, NULL);
1909 fprintf_unfiltered (gdb_stdlog, " // inside entry file }\n");
1914 /* If any of the old frame initialization methods are around, use
1915 the legacy get_prev_frame method. */
1916 if (legacy_frame_p (current_gdbarch))
1918 prev_frame = legacy_get_prev_frame (this_frame);
1922 /* Check that this frame's ID was valid. If it wasn't, don't try to
1923 unwind to the prev frame. Be careful to not apply this test to
1924 the sentinel frame. */
1925 if (this_frame->level >= 0 && !frame_id_p (get_frame_id (this_frame)))
1929 fprintf_unfiltered (gdb_stdlog, "-> ");
1930 fprint_frame (gdb_stdlog, NULL);
1931 fprintf_unfiltered (gdb_stdlog, " // this ID is NULL }\n");
1936 /* Check that this frame's ID isn't inner to (younger, below, next)
1937 the next frame. This happens when a frame unwind goes backwards.
1938 Since the sentinel frame doesn't really exist, don't compare the
1939 inner-most against that sentinel. */
1940 if (this_frame->level > 0
1941 && frame_id_inner (get_frame_id (this_frame),
1942 get_frame_id (this_frame->next)))
1943 error ("Previous frame inner to this frame (corrupt stack?)");
1945 /* Check that this and the next frame are not identical. If they
1946 are, there is most likely a stack cycle. As with the inner-than
1947 test above, avoid comparing the inner-most and sentinel frames. */
1948 if (this_frame->level > 0
1949 && frame_id_eq (get_frame_id (this_frame),
1950 get_frame_id (this_frame->next)))
1951 error ("Previous frame identical to this frame (corrupt stack?)");
1953 /* Allocate the new frame but do not wire it in to the frame chain.
1954 Some (bad) code in INIT_FRAME_EXTRA_INFO tries to look along
1955 frame->next to pull some fancy tricks (of course such code is, by
1956 definition, recursive). Try to prevent it.
1958 There is no reason to worry about memory leaks, should the
1959 remainder of the function fail. The allocated memory will be
1960 quickly reclaimed when the frame cache is flushed, and the `we've
1961 been here before' check above will stop repeated memory
1962 allocation calls. */
1963 prev_frame = FRAME_OBSTACK_ZALLOC (struct frame_info);
1964 prev_frame->level = this_frame->level + 1;
1966 /* Don't yet compute ->unwind (and hence ->type). It is computed
1967 on-demand in get_frame_type, frame_register_unwind, and
1970 /* Don't yet compute the frame's ID. It is computed on-demand by
1973 /* The unwound frame ID is validate at the start of this function,
1974 as part of the logic to decide if that frame should be further
1975 unwound, and not here while the prev frame is being created.
1976 Doing this makes it possible for the user to examine a frame that
1977 has an invalid frame ID.
1979 Some very old VAX code noted: [...] For the sake of argument,
1980 suppose that the stack is somewhat trashed (which is one reason
1981 that "info frame" exists). So, return 0 (indicating we don't
1982 know the address of the arglist) if we don't know what frame this
1986 this_frame->prev = prev_frame;
1987 prev_frame->next = this_frame;
1991 fprintf_unfiltered (gdb_stdlog, "-> ");
1992 fprint_frame (gdb_stdlog, prev_frame);
1993 fprintf_unfiltered (gdb_stdlog, " }\n");
2000 get_frame_pc (struct frame_info *frame)
2002 gdb_assert (frame->next != NULL);
2003 return frame_pc_unwind (frame->next);
2006 /* Return an address of that falls within the frame's code block. */
2009 frame_unwind_address_in_block (struct frame_info *next_frame)
2011 /* A draft address. */
2012 CORE_ADDR pc = frame_pc_unwind (next_frame);
2014 if ((frame_tdep_pc_fixup != NULL) && (frame_tdep_pc_fixup(&pc) == 0))
2017 /* If THIS frame is not inner most (i.e., NEXT isn't the sentinel),
2018 and NEXT is `normal' (i.e., not a sigtramp, dummy, ....) THIS
2019 frame's PC ends up pointing at the instruction fallowing the
2020 "call". Adjust that PC value so that it falls on the call
2021 instruction (which, hopefully, falls within THIS frame's code
2022 block. So far it's proved to be a very good approximation. See
2023 get_frame_type for why ->type can't be used. */
2024 if (next_frame->level >= 0
2025 && get_frame_type (next_frame) == NORMAL_FRAME)
2031 get_frame_address_in_block (struct frame_info *this_frame)
2033 return frame_unwind_address_in_block (this_frame->next);
2037 pc_notcurrent (struct frame_info *frame)
2039 /* If FRAME is not the innermost frame, that normally means that
2040 FRAME->pc points at the return instruction (which is *after* the
2041 call instruction), and we want to get the line containing the
2042 call (because the call is where the user thinks the program is).
2043 However, if the next frame is either a SIGTRAMP_FRAME or a
2044 DUMMY_FRAME, then the next frame will contain a saved interrupt
2045 PC and such a PC indicates the current (rather than next)
2046 instruction/line, consequently, for such cases, want to get the
2047 line containing fi->pc. */
2048 struct frame_info *next = get_next_frame (frame);
2049 int notcurrent = (next != NULL && get_frame_type (next) == NORMAL_FRAME);
2054 find_frame_sal (struct frame_info *frame, struct symtab_and_line *sal)
2056 (*sal) = find_pc_line (get_frame_pc (frame), pc_notcurrent (frame));
2059 /* Per "frame.h", return the ``address'' of the frame. Code should
2060 really be using get_frame_id(). */
2062 get_frame_base (struct frame_info *fi)
2064 return get_frame_id (fi).stack_addr;
2067 /* High-level offsets into the frame. Used by the debug info. */
2070 get_frame_base_address (struct frame_info *fi)
2072 if (get_frame_type (fi) != NORMAL_FRAME)
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 return fi->base->this_base (fi->next, &fi->prologue_cache);
2080 return fi->base->this_base (fi->next, &fi->base_cache);
2084 get_frame_locals_address (struct frame_info *fi)
2087 if (get_frame_type (fi) != NORMAL_FRAME)
2089 /* If there isn't a frame address method, find it. */
2090 if (fi->base == NULL)
2091 fi->base = frame_base_find_by_frame (fi->next);
2092 /* Sneaky: If the low-level unwind and high-level base code share a
2093 common unwinder, let them share the prologue cache. */
2094 if (fi->base->unwind == fi->unwind)
2095 cache = &fi->prologue_cache;
2097 cache = &fi->base_cache;
2098 return fi->base->this_locals (fi->next, cache);
2102 get_frame_args_address (struct frame_info *fi)
2105 if (get_frame_type (fi) != NORMAL_FRAME)
2107 /* If there isn't a frame address method, find it. */
2108 if (fi->base == NULL)
2109 fi->base = frame_base_find_by_frame (fi->next);
2110 /* Sneaky: If the low-level unwind and high-level base code share a
2111 common unwinder, let them share the prologue cache. */
2112 if (fi->base->unwind == fi->unwind)
2113 cache = &fi->prologue_cache;
2115 cache = &fi->base_cache;
2116 return fi->base->this_args (fi->next, cache);
2119 /* Level of the selected frame: 0 for innermost, 1 for its caller, ...
2120 or -1 for a NULL frame. */
2123 frame_relative_level (struct frame_info *fi)
2132 get_frame_type (struct frame_info *frame)
2134 /* Some targets still don't use [generic] dummy frames. Catch them
2136 if (!DEPRECATED_USE_GENERIC_DUMMY_FRAMES
2137 && deprecated_frame_in_dummy (frame))
2140 /* Some legacy code, e.g, mips_init_extra_frame_info() wants
2141 to determine the frame's type prior to it being completely
2142 initialized. Don't attempt to lazily initialize ->unwind for
2143 legacy code. It will be initialized in legacy_get_prev_frame(). */
2144 if (frame->unwind == NULL && !legacy_frame_p (current_gdbarch))
2146 /* Initialize the frame's unwinder because it is that which
2147 provides the frame's type. */
2148 frame->unwind = frame_unwind_find_by_frame (frame->next);
2149 /* FIXME: cagney/2003-04-02: Rather than storing the frame's
2150 type in the frame, the unwinder's type should be returned
2151 directly. Unfortunately, legacy code, called by
2152 legacy_get_prev_frame, explicitly set the frames type using
2153 the method deprecated_set_frame_type(). */
2154 frame->type = frame->unwind->type;
2156 if (frame->type == UNKNOWN_FRAME)
2157 return NORMAL_FRAME;
2163 deprecated_set_frame_type (struct frame_info *frame, enum frame_type type)
2165 /* Arrrg! See comment in "frame.h". */
2169 struct frame_extra_info *
2170 get_frame_extra_info (struct frame_info *fi)
2172 return fi->extra_info;
2175 struct frame_extra_info *
2176 frame_extra_info_zalloc (struct frame_info *fi, long size)
2178 fi->extra_info = frame_obstack_zalloc (size);
2179 return fi->extra_info;
2183 deprecated_update_frame_pc_hack (struct frame_info *frame, CORE_ADDR pc)
2186 fprintf_unfiltered (gdb_stdlog,
2187 "{ deprecated_update_frame_pc_hack (frame=%d,pc=0x%s) }\n",
2188 frame->level, paddr_nz (pc));
2189 /* NOTE: cagney/2003-03-11: Some architectures (e.g., Arm) are
2190 maintaining a locally allocated frame object. Since such frame's
2191 are not in the frame chain, it isn't possible to assume that the
2192 frame has a next. Sigh. */
2193 if (frame->next != NULL)
2195 /* While we're at it, update this frame's cached PC value, found
2196 in the next frame. Oh for the day when "struct frame_info"
2197 is opaque and this hack on hack can just go away. */
2198 frame->next->prev_pc.value = pc;
2199 frame->next->prev_pc.p = 1;
2204 deprecated_update_frame_base_hack (struct frame_info *frame, CORE_ADDR base)
2207 fprintf_unfiltered (gdb_stdlog,
2208 "{ deprecated_update_frame_base_hack (frame=%d,base=0x%s) }\n",
2209 frame->level, paddr_nz (base));
2210 /* See comment in "frame.h". */
2211 frame->this_id.value.stack_addr = base;
2215 deprecated_frame_xmalloc_with_cleanup (long sizeof_saved_regs,
2216 long sizeof_extra_info)
2218 struct frame_info *frame = XMALLOC (struct frame_info);
2219 memset (frame, 0, sizeof (*frame));
2220 frame->this_id.p = 1;
2221 make_cleanup (xfree, frame);
2222 if (sizeof_saved_regs > 0)
2224 frame->saved_regs = xcalloc (1, sizeof_saved_regs);
2225 make_cleanup (xfree, frame->saved_regs);
2227 if (sizeof_extra_info > 0)
2229 frame->extra_info = xcalloc (1, sizeof_extra_info);
2230 make_cleanup (xfree, frame->extra_info);
2235 /* Memory access methods. */
2238 get_frame_memory (struct frame_info *this_frame, CORE_ADDR addr, void *buf,
2241 read_memory (addr, buf, len);
2245 get_frame_memory_signed (struct frame_info *this_frame, CORE_ADDR addr,
2248 return read_memory_integer (addr, len);
2252 get_frame_memory_unsigned (struct frame_info *this_frame, CORE_ADDR addr,
2255 return read_memory_unsigned_integer (addr, len);
2258 /* Architecture method. */
2261 get_frame_arch (struct frame_info *this_frame)
2263 return current_gdbarch;
2266 /* Stack pointer methods. */
2269 get_frame_sp (struct frame_info *this_frame)
2271 return frame_sp_unwind (this_frame->next);
2275 frame_sp_unwind (struct frame_info *next_frame)
2277 /* Normality, an architecture that provides a way of obtaining any
2278 frame inner-most address. */
2279 if (gdbarch_unwind_sp_p (current_gdbarch))
2280 return gdbarch_unwind_sp (current_gdbarch, next_frame);
2281 /* Things are looking grim. If it's the inner-most frame and there
2282 is a TARGET_READ_SP then that can be used. */
2283 if (next_frame->level < 0 && TARGET_READ_SP_P ())
2284 return TARGET_READ_SP ();
2285 /* Now things are really are grim. Hope that the value returned by
2286 the SP_REGNUM register is meaningful. */
2290 frame_unwind_unsigned_register (next_frame, SP_REGNUM, &sp);
2293 internal_error (__FILE__, __LINE__, "Missing unwind SP method");
2298 legacy_frame_p (struct gdbarch *current_gdbarch)
2300 if (DEPRECATED_INIT_FRAME_PC_P ()
2301 || DEPRECATED_INIT_FRAME_PC_FIRST_P ()
2302 || DEPRECATED_INIT_EXTRA_FRAME_INFO_P ()
2303 || DEPRECATED_FRAME_CHAIN_P ())
2304 /* No question, it's a legacy frame. */
2306 if (gdbarch_unwind_dummy_id_p (current_gdbarch))
2307 /* No question, it's not a legacy frame (provided none of the
2308 deprecated methods checked above are present that is). */
2310 if (DEPRECATED_TARGET_READ_FP_P ()
2311 || DEPRECATED_FP_REGNUM >= 0)
2312 /* Assume it's legacy. If you're trying to convert a legacy frame
2313 target to the new mechanism, get rid of these. legacy
2314 get_prev_frame requires these when unwind_frame_id isn't
2317 /* Default to assuming that it's brand new code, and hence not
2318 legacy. Force it down the non-legacy path so that the new code
2319 uses the new frame mechanism from day one. Dummy frame's won't
2320 work very well but we can live with that. */
2324 extern initialize_file_ftype _initialize_frame; /* -Wmissing-prototypes */
2326 static struct cmd_list_element *set_backtrace_cmdlist;
2327 static struct cmd_list_element *show_backtrace_cmdlist;
2330 set_backtrace_cmd (char *args, int from_tty)
2332 help_list (set_backtrace_cmdlist, "set backtrace ", -1, gdb_stdout);
2336 show_backtrace_cmd (char *args, int from_tty)
2338 cmd_show_list (show_backtrace_cmdlist, from_tty, "");
2342 _initialize_frame (void)
2344 obstack_init (&frame_cache_obstack);
2346 add_prefix_cmd ("backtrace", class_maintenance, set_backtrace_cmd, "\
2347 Set backtrace specific variables.\n\
2348 Configure backtrace variables such as the backtrace limit",
2349 &set_backtrace_cmdlist, "set backtrace ",
2350 0/*allow-unknown*/, &setlist);
2351 add_prefix_cmd ("backtrace", class_maintenance, show_backtrace_cmd, "\
2352 Show backtrace specific variables\n\
2353 Show backtrace variables such as the backtrace limit",
2354 &show_backtrace_cmdlist, "show backtrace ",
2355 0/*allow-unknown*/, &showlist);
2357 add_setshow_boolean_cmd ("past-main", class_obscure,
2358 &backtrace_past_main, "\
2359 Set whether backtraces should continue past \"main\".\n\
2360 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2361 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2362 of the stack trace.", "\
2363 Show whether backtraces should continue past \"main\".\n\
2364 Normally the caller of \"main\" is not of interest, so GDB will terminate\n\
2365 the backtrace at \"main\". Set this variable if you need to see the rest\n\
2366 of the stack trace.",
2367 NULL, NULL, &set_backtrace_cmdlist,
2368 &show_backtrace_cmdlist);
2370 add_setshow_uinteger_cmd ("limit", class_obscure,
2371 &backtrace_limit, "\
2372 Set an upper bound on the number of backtrace levels.\n\
2373 No more than the specified number of frames can be displayed or examined.\n\
2374 Zero is unlimited.", "\
2375 Show the upper bound on the number of backtrace levels.",
2376 NULL, NULL, &set_backtrace_cmdlist,
2377 &show_backtrace_cmdlist);
2379 /* Debug this files internals. */
2380 add_show_from_set (add_set_cmd ("frame", class_maintenance, var_zinteger,
2381 &frame_debug, "Set frame debugging.\n\
2382 When non-zero, frame specific internal debugging is enabled.", &setdebuglist),