1 /* Cache and manage the values of registers for GDB, the GNU debugger.
3 Copyright (C) 1986-2016 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "reggroups.h"
35 * Here is the actual register cache.
38 /* Per-architecture object describing the layout of a register cache.
39 Computed once when the architecture is created. */
41 struct gdbarch_data *regcache_descr_handle;
45 /* The architecture this descriptor belongs to. */
46 struct gdbarch *gdbarch;
48 /* The raw register cache. Each raw (or hard) register is supplied
49 by the target interface. The raw cache should not contain
50 redundant information - if the PC is constructed from two
51 registers then those registers and not the PC lives in the raw
54 long sizeof_raw_registers;
55 long sizeof_raw_register_status;
57 /* The cooked register space. Each cooked register in the range
58 [0..NR_RAW_REGISTERS) is direct-mapped onto the corresponding raw
59 register. The remaining [NR_RAW_REGISTERS
60 .. NR_COOKED_REGISTERS) (a.k.a. pseudo registers) are mapped onto
61 both raw registers and memory by the architecture methods
62 gdbarch_pseudo_register_read and gdbarch_pseudo_register_write. */
63 int nr_cooked_registers;
64 long sizeof_cooked_registers;
65 long sizeof_cooked_register_status;
67 /* Offset and size (in 8 bit bytes), of each register in the
68 register cache. All registers (including those in the range
69 [NR_RAW_REGISTERS .. NR_COOKED_REGISTERS) are given an
71 long *register_offset;
72 long *sizeof_register;
74 /* Cached table containing the type of each register. */
75 struct type **register_type;
79 init_regcache_descr (struct gdbarch *gdbarch)
82 struct regcache_descr *descr;
83 gdb_assert (gdbarch != NULL);
85 /* Create an initial, zero filled, table. */
86 descr = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct regcache_descr);
87 descr->gdbarch = gdbarch;
89 /* Total size of the register space. The raw registers are mapped
90 directly onto the raw register cache while the pseudo's are
91 either mapped onto raw-registers or memory. */
92 descr->nr_cooked_registers = gdbarch_num_regs (gdbarch)
93 + gdbarch_num_pseudo_regs (gdbarch);
94 descr->sizeof_cooked_register_status
95 = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
97 /* Fill in a table of register types. */
99 = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers,
101 for (i = 0; i < descr->nr_cooked_registers; i++)
102 descr->register_type[i] = gdbarch_register_type (gdbarch, i);
104 /* Construct a strictly RAW register cache. Don't allow pseudo's
105 into the register cache. */
106 descr->nr_raw_registers = gdbarch_num_regs (gdbarch);
107 descr->sizeof_raw_register_status = gdbarch_num_regs (gdbarch);
109 /* Lay out the register cache.
111 NOTE: cagney/2002-05-22: Only register_type() is used when
112 constructing the register cache. It is assumed that the
113 register's raw size, virtual size and type length are all the
119 descr->sizeof_register
120 = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long);
121 descr->register_offset
122 = GDBARCH_OBSTACK_CALLOC (gdbarch, descr->nr_cooked_registers, long);
123 for (i = 0; i < descr->nr_raw_registers; i++)
125 descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]);
126 descr->register_offset[i] = offset;
127 offset += descr->sizeof_register[i];
128 gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]);
130 /* Set the real size of the raw register cache buffer. */
131 descr->sizeof_raw_registers = offset;
133 for (; i < descr->nr_cooked_registers; i++)
135 descr->sizeof_register[i] = TYPE_LENGTH (descr->register_type[i]);
136 descr->register_offset[i] = offset;
137 offset += descr->sizeof_register[i];
138 gdb_assert (MAX_REGISTER_SIZE >= descr->sizeof_register[i]);
140 /* Set the real size of the readonly register cache buffer. */
141 descr->sizeof_cooked_registers = offset;
147 static struct regcache_descr *
148 regcache_descr (struct gdbarch *gdbarch)
150 return (struct regcache_descr *) gdbarch_data (gdbarch,
151 regcache_descr_handle);
154 /* Utility functions returning useful register attributes stored in
155 the regcache descr. */
158 register_type (struct gdbarch *gdbarch, int regnum)
160 struct regcache_descr *descr = regcache_descr (gdbarch);
162 gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
163 return descr->register_type[regnum];
166 /* Utility functions returning useful register attributes stored in
167 the regcache descr. */
170 register_size (struct gdbarch *gdbarch, int regnum)
172 struct regcache_descr *descr = regcache_descr (gdbarch);
175 gdb_assert (regnum >= 0
176 && regnum < (gdbarch_num_regs (gdbarch)
177 + gdbarch_num_pseudo_regs (gdbarch)));
178 size = descr->sizeof_register[regnum];
182 /* See common/common-regcache.h. */
185 regcache_register_size (const struct regcache *regcache, int n)
187 return register_size (get_regcache_arch (regcache), n);
190 /* The register cache for storing raw register values. */
194 struct regcache_descr *descr;
196 /* The address space of this register cache (for registers where it
197 makes sense, like PC or SP). */
198 struct address_space *aspace;
200 /* The register buffers. A read-only register cache can hold the
201 full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write
202 register cache can only hold [0 .. gdbarch_num_regs). */
204 /* Register cache status. */
205 signed char *register_status;
206 /* Is this a read-only cache? A read-only cache is used for saving
207 the target's register state (e.g, across an inferior function
208 call or just before forcing a function return). A read-only
209 cache can only be updated via the methods regcache_dup() and
210 regcache_cpy(). The actual contents are determined by the
211 reggroup_save and reggroup_restore methods. */
213 /* If this is a read-write cache, which thread's registers is
218 static struct regcache *
219 regcache_xmalloc_1 (struct gdbarch *gdbarch, struct address_space *aspace,
222 struct regcache_descr *descr;
223 struct regcache *regcache;
225 gdb_assert (gdbarch != NULL);
226 descr = regcache_descr (gdbarch);
227 regcache = XNEW (struct regcache);
228 regcache->descr = descr;
229 regcache->readonly_p = readonly_p;
233 = XCNEWVEC (gdb_byte, descr->sizeof_cooked_registers);
234 regcache->register_status
235 = XCNEWVEC (signed char, descr->sizeof_cooked_register_status);
240 = XCNEWVEC (gdb_byte, descr->sizeof_raw_registers);
241 regcache->register_status
242 = XCNEWVEC (signed char, descr->sizeof_raw_register_status);
244 regcache->aspace = aspace;
245 regcache->ptid = minus_one_ptid;
250 regcache_xmalloc (struct gdbarch *gdbarch, struct address_space *aspace)
252 return regcache_xmalloc_1 (gdbarch, aspace, 1);
256 regcache_xfree (struct regcache *regcache)
258 if (regcache == NULL)
260 xfree (regcache->registers);
261 xfree (regcache->register_status);
266 do_regcache_xfree (void *data)
268 regcache_xfree ((struct regcache *) data);
272 make_cleanup_regcache_xfree (struct regcache *regcache)
274 return make_cleanup (do_regcache_xfree, regcache);
277 /* Cleanup routines for invalidating a register. */
279 struct register_to_invalidate
281 struct regcache *regcache;
286 do_regcache_invalidate (void *data)
288 struct register_to_invalidate *reg = (struct register_to_invalidate *) data;
290 regcache_invalidate (reg->regcache, reg->regnum);
293 static struct cleanup *
294 make_cleanup_regcache_invalidate (struct regcache *regcache, int regnum)
296 struct register_to_invalidate* reg = XNEW (struct register_to_invalidate);
298 reg->regcache = regcache;
299 reg->regnum = regnum;
300 return make_cleanup_dtor (do_regcache_invalidate, (void *) reg, xfree);
303 /* Return REGCACHE's architecture. */
306 get_regcache_arch (const struct regcache *regcache)
308 return regcache->descr->gdbarch;
311 struct address_space *
312 get_regcache_aspace (const struct regcache *regcache)
314 return regcache->aspace;
317 /* Return a pointer to register REGNUM's buffer cache. */
320 register_buffer (const struct regcache *regcache, int regnum)
322 return regcache->registers + regcache->descr->register_offset[regnum];
326 regcache_save (struct regcache *dst, regcache_cooked_read_ftype *cooked_read,
329 struct gdbarch *gdbarch = dst->descr->gdbarch;
330 gdb_byte buf[MAX_REGISTER_SIZE];
333 /* The DST should be `read-only', if it wasn't then the save would
334 end up trying to write the register values back out to the
336 gdb_assert (dst->readonly_p);
337 /* Clear the dest. */
338 memset (dst->registers, 0, dst->descr->sizeof_cooked_registers);
339 memset (dst->register_status, 0,
340 dst->descr->sizeof_cooked_register_status);
341 /* Copy over any registers (identified by their membership in the
342 save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs +
343 gdbarch_num_pseudo_regs) range is checked since some architectures need
344 to save/restore `cooked' registers that live in memory. */
345 for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++)
347 if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup))
349 enum register_status status = cooked_read (src, regnum, buf);
351 if (status == REG_VALID)
352 memcpy (register_buffer (dst, regnum), buf,
353 register_size (gdbarch, regnum));
356 gdb_assert (status != REG_UNKNOWN);
358 memset (register_buffer (dst, regnum), 0,
359 register_size (gdbarch, regnum));
361 dst->register_status[regnum] = status;
367 regcache_restore (struct regcache *dst,
368 regcache_cooked_read_ftype *cooked_read,
369 void *cooked_read_context)
371 struct gdbarch *gdbarch = dst->descr->gdbarch;
372 gdb_byte buf[MAX_REGISTER_SIZE];
375 /* The dst had better not be read-only. If it is, the `restore'
376 doesn't make much sense. */
377 gdb_assert (!dst->readonly_p);
378 /* Copy over any registers, being careful to only restore those that
379 were both saved and need to be restored. The full [0 .. gdbarch_num_regs
380 + gdbarch_num_pseudo_regs) range is checked since some architectures need
381 to save/restore `cooked' registers that live in memory. */
382 for (regnum = 0; regnum < dst->descr->nr_cooked_registers; regnum++)
384 if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup))
386 enum register_status status;
388 status = cooked_read (cooked_read_context, regnum, buf);
389 if (status == REG_VALID)
390 regcache_cooked_write (dst, regnum, buf);
395 static enum register_status
396 do_cooked_read (void *src, int regnum, gdb_byte *buf)
398 struct regcache *regcache = (struct regcache *) src;
400 return regcache_cooked_read (regcache, regnum, buf);
403 static void regcache_cpy_no_passthrough (struct regcache *dst,
404 struct regcache *src);
407 regcache_cpy (struct regcache *dst, struct regcache *src)
409 gdb_assert (src != NULL && dst != NULL);
410 gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
411 gdb_assert (src != dst);
412 gdb_assert (src->readonly_p || dst->readonly_p);
414 if (!src->readonly_p)
415 regcache_save (dst, do_cooked_read, src);
416 else if (!dst->readonly_p)
417 regcache_restore (dst, do_cooked_read, src);
419 regcache_cpy_no_passthrough (dst, src);
422 /* Copy/duplicate the contents of a register cache. Unlike regcache_cpy,
423 which is pass-through, this does not go through to the target.
424 Only values values already in the cache are transferred. The SRC and DST
425 buffers must not overlap. */
428 regcache_cpy_no_passthrough (struct regcache *dst, struct regcache *src)
430 gdb_assert (src != NULL && dst != NULL);
431 gdb_assert (src->descr->gdbarch == dst->descr->gdbarch);
432 /* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough
433 move of data into a thread's regcache. Doing this would be silly
434 - it would mean that regcache->register_status would be
435 completely invalid. */
436 gdb_assert (dst->readonly_p && src->readonly_p);
438 memcpy (dst->registers, src->registers,
439 dst->descr->sizeof_cooked_registers);
440 memcpy (dst->register_status, src->register_status,
441 dst->descr->sizeof_cooked_register_status);
445 regcache_dup (struct regcache *src)
447 struct regcache *newbuf;
449 newbuf = regcache_xmalloc (src->descr->gdbarch, get_regcache_aspace (src));
450 regcache_cpy (newbuf, src);
455 regcache_register_status (const struct regcache *regcache, int regnum)
457 gdb_assert (regcache != NULL);
458 gdb_assert (regnum >= 0);
459 if (regcache->readonly_p)
460 gdb_assert (regnum < regcache->descr->nr_cooked_registers);
462 gdb_assert (regnum < regcache->descr->nr_raw_registers);
464 return (enum register_status) regcache->register_status[regnum];
468 regcache_invalidate (struct regcache *regcache, int regnum)
470 gdb_assert (regcache != NULL);
471 gdb_assert (regnum >= 0);
472 gdb_assert (!regcache->readonly_p);
473 gdb_assert (regnum < regcache->descr->nr_raw_registers);
474 regcache->register_status[regnum] = REG_UNKNOWN;
478 /* Global structure containing the current regcache. */
480 /* NOTE: this is a write-through cache. There is no "dirty" bit for
481 recording if the register values have been changed (eg. by the
482 user). Therefore all registers must be written back to the
483 target when appropriate. */
487 struct regcache *regcache;
488 struct regcache_list *next;
491 static struct regcache_list *current_regcache;
494 get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
495 struct address_space *aspace)
497 struct regcache_list *list;
498 struct regcache *new_regcache;
500 for (list = current_regcache; list; list = list->next)
501 if (ptid_equal (list->regcache->ptid, ptid)
502 && get_regcache_arch (list->regcache) == gdbarch)
503 return list->regcache;
505 new_regcache = regcache_xmalloc_1 (gdbarch, aspace, 0);
506 new_regcache->ptid = ptid;
508 list = XNEW (struct regcache_list);
509 list->regcache = new_regcache;
510 list->next = current_regcache;
511 current_regcache = list;
517 get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch)
519 struct address_space *aspace;
521 /* For the benefit of "maint print registers" & co when debugging an
522 executable, allow dumping the regcache even when there is no
523 thread selected (target_thread_address_space internal-errors if
524 no address space is found). Note that normal user commands will
525 fail higher up on the call stack due to no
526 target_has_registers. */
527 aspace = (ptid_equal (null_ptid, ptid)
529 : target_thread_address_space (ptid));
531 return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace);
534 static ptid_t current_thread_ptid;
535 static struct gdbarch *current_thread_arch;
538 get_thread_regcache (ptid_t ptid)
540 if (!current_thread_arch || !ptid_equal (current_thread_ptid, ptid))
542 current_thread_ptid = ptid;
543 current_thread_arch = target_thread_architecture (ptid);
546 return get_thread_arch_regcache (ptid, current_thread_arch);
550 get_current_regcache (void)
552 return get_thread_regcache (inferior_ptid);
555 /* See common/common-regcache.h. */
558 get_thread_regcache_for_ptid (ptid_t ptid)
560 return get_thread_regcache (ptid);
563 /* Observer for the target_changed event. */
566 regcache_observer_target_changed (struct target_ops *target)
568 registers_changed ();
571 /* Update global variables old ptids to hold NEW_PTID if they were
574 regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid)
576 struct regcache_list *list;
578 for (list = current_regcache; list; list = list->next)
579 if (ptid_equal (list->regcache->ptid, old_ptid))
580 list->regcache->ptid = new_ptid;
583 /* Low level examining and depositing of registers.
585 The caller is responsible for making sure that the inferior is
586 stopped before calling the fetching routines, or it will get
587 garbage. (a change from GDB version 3, in which the caller got the
588 value from the last stop). */
590 /* REGISTERS_CHANGED ()
592 Indicate that registers may have changed, so invalidate the cache. */
595 registers_changed_ptid (ptid_t ptid)
597 struct regcache_list *list, **list_link;
599 list = current_regcache;
600 list_link = ¤t_regcache;
603 if (ptid_match (list->regcache->ptid, ptid))
605 struct regcache_list *dead = list;
607 *list_link = list->next;
608 regcache_xfree (list->regcache);
614 list_link = &list->next;
618 if (ptid_match (current_thread_ptid, ptid))
620 current_thread_ptid = null_ptid;
621 current_thread_arch = NULL;
624 if (ptid_match (inferior_ptid, ptid))
626 /* We just deleted the regcache of the current thread. Need to
627 forget about any frames we have cached, too. */
628 reinit_frame_cache ();
633 registers_changed (void)
635 registers_changed_ptid (minus_one_ptid);
637 /* Force cleanup of any alloca areas if using C alloca instead of
638 a builtin alloca. This particular call is used to clean up
639 areas allocated by low level target code which may build up
640 during lengthy interactions between gdb and the target before
641 gdb gives control to the user (ie watchpoints). */
646 regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
648 gdb_assert (regcache != NULL && buf != NULL);
649 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
650 /* Make certain that the register cache is up-to-date with respect
651 to the current thread. This switching shouldn't be necessary
652 only there is still only one target side register cache. Sigh!
653 On the bright side, at least there is a regcache object. */
654 if (!regcache->readonly_p
655 && regcache_register_status (regcache, regnum) == REG_UNKNOWN)
657 struct cleanup *old_chain = save_inferior_ptid ();
659 inferior_ptid = regcache->ptid;
660 target_fetch_registers (regcache, regnum);
661 do_cleanups (old_chain);
663 /* A number of targets can't access the whole set of raw
664 registers (because the debug API provides no means to get at
666 if (regcache->register_status[regnum] == REG_UNKNOWN)
667 regcache->register_status[regnum] = REG_UNAVAILABLE;
670 if (regcache->register_status[regnum] != REG_VALID)
671 memset (buf, 0, regcache->descr->sizeof_register[regnum]);
673 memcpy (buf, register_buffer (regcache, regnum),
674 regcache->descr->sizeof_register[regnum]);
676 return (enum register_status) regcache->register_status[regnum];
680 regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val)
683 enum register_status status;
685 gdb_assert (regcache != NULL);
686 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
687 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
688 status = regcache_raw_read (regcache, regnum, buf);
689 if (status == REG_VALID)
690 *val = extract_signed_integer
691 (buf, regcache->descr->sizeof_register[regnum],
692 gdbarch_byte_order (regcache->descr->gdbarch));
699 regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
703 enum register_status status;
705 gdb_assert (regcache != NULL);
706 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
707 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
708 status = regcache_raw_read (regcache, regnum, buf);
709 if (status == REG_VALID)
710 *val = extract_unsigned_integer
711 (buf, regcache->descr->sizeof_register[regnum],
712 gdbarch_byte_order (regcache->descr->gdbarch));
719 regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val)
723 gdb_assert (regcache != NULL);
724 gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers);
725 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
726 store_signed_integer (buf, regcache->descr->sizeof_register[regnum],
727 gdbarch_byte_order (regcache->descr->gdbarch), val);
728 regcache_raw_write (regcache, regnum, buf);
732 regcache_raw_write_unsigned (struct regcache *regcache, int regnum,
737 gdb_assert (regcache != NULL);
738 gdb_assert (regnum >=0 && regnum < regcache->descr->nr_raw_registers);
739 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
740 store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum],
741 gdbarch_byte_order (regcache->descr->gdbarch), val);
742 regcache_raw_write (regcache, regnum, buf);
746 regcache_raw_get_signed (struct regcache *regcache, int regnum)
749 enum register_status status;
751 status = regcache_raw_read_signed (regcache, regnum, &value);
752 if (status == REG_UNAVAILABLE)
753 throw_error (NOT_AVAILABLE_ERROR,
754 _("Register %d is not available"), regnum);
759 regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf)
761 gdb_assert (regnum >= 0);
762 gdb_assert (regnum < regcache->descr->nr_cooked_registers);
763 if (regnum < regcache->descr->nr_raw_registers)
764 return regcache_raw_read (regcache, regnum, buf);
765 else if (regcache->readonly_p
766 && regcache->register_status[regnum] != REG_UNKNOWN)
768 /* Read-only register cache, perhaps the cooked value was
770 if (regcache->register_status[regnum] == REG_VALID)
771 memcpy (buf, register_buffer (regcache, regnum),
772 regcache->descr->sizeof_register[regnum]);
774 memset (buf, 0, regcache->descr->sizeof_register[regnum]);
776 return (enum register_status) regcache->register_status[regnum];
778 else if (gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch))
780 struct value *mark, *computed;
781 enum register_status result = REG_VALID;
783 mark = value_mark ();
785 computed = gdbarch_pseudo_register_read_value (regcache->descr->gdbarch,
787 if (value_entirely_available (computed))
788 memcpy (buf, value_contents_raw (computed),
789 regcache->descr->sizeof_register[regnum]);
792 memset (buf, 0, regcache->descr->sizeof_register[regnum]);
793 result = REG_UNAVAILABLE;
796 value_free_to_mark (mark);
801 return gdbarch_pseudo_register_read (regcache->descr->gdbarch, regcache,
806 regcache_cooked_read_value (struct regcache *regcache, int regnum)
808 gdb_assert (regnum >= 0);
809 gdb_assert (regnum < regcache->descr->nr_cooked_registers);
811 if (regnum < regcache->descr->nr_raw_registers
812 || (regcache->readonly_p
813 && regcache->register_status[regnum] != REG_UNKNOWN)
814 || !gdbarch_pseudo_register_read_value_p (regcache->descr->gdbarch))
816 struct value *result;
818 result = allocate_value (register_type (regcache->descr->gdbarch,
820 VALUE_LVAL (result) = lval_register;
821 VALUE_REGNUM (result) = regnum;
823 /* It is more efficient in general to do this delegation in this
824 direction than in the other one, even though the value-based
826 if (regcache_cooked_read (regcache, regnum,
827 value_contents_raw (result)) == REG_UNAVAILABLE)
828 mark_value_bytes_unavailable (result, 0,
829 TYPE_LENGTH (value_type (result)));
834 return gdbarch_pseudo_register_read_value (regcache->descr->gdbarch,
839 regcache_cooked_read_signed (struct regcache *regcache, int regnum,
842 enum register_status status;
845 gdb_assert (regcache != NULL);
846 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers);
847 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
848 status = regcache_cooked_read (regcache, regnum, buf);
849 if (status == REG_VALID)
850 *val = extract_signed_integer
851 (buf, regcache->descr->sizeof_register[regnum],
852 gdbarch_byte_order (regcache->descr->gdbarch));
859 regcache_cooked_read_unsigned (struct regcache *regcache, int regnum,
862 enum register_status status;
865 gdb_assert (regcache != NULL);
866 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_cooked_registers);
867 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
868 status = regcache_cooked_read (regcache, regnum, buf);
869 if (status == REG_VALID)
870 *val = extract_unsigned_integer
871 (buf, regcache->descr->sizeof_register[regnum],
872 gdbarch_byte_order (regcache->descr->gdbarch));
879 regcache_cooked_write_signed (struct regcache *regcache, int regnum,
884 gdb_assert (regcache != NULL);
885 gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers);
886 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
887 store_signed_integer (buf, regcache->descr->sizeof_register[regnum],
888 gdbarch_byte_order (regcache->descr->gdbarch), val);
889 regcache_cooked_write (regcache, regnum, buf);
893 regcache_cooked_write_unsigned (struct regcache *regcache, int regnum,
898 gdb_assert (regcache != NULL);
899 gdb_assert (regnum >=0 && regnum < regcache->descr->nr_cooked_registers);
900 buf = (gdb_byte *) alloca (regcache->descr->sizeof_register[regnum]);
901 store_unsigned_integer (buf, regcache->descr->sizeof_register[regnum],
902 gdbarch_byte_order (regcache->descr->gdbarch), val);
903 regcache_cooked_write (regcache, regnum, buf);
906 /* See regcache.h. */
909 regcache_raw_set_cached_value (struct regcache *regcache, int regnum,
912 memcpy (register_buffer (regcache, regnum), buf,
913 regcache->descr->sizeof_register[regnum]);
914 regcache->register_status[regnum] = REG_VALID;
918 regcache_raw_write (struct regcache *regcache, int regnum,
921 struct cleanup *chain_before_save_inferior;
922 struct cleanup *chain_before_invalidate_register;
924 gdb_assert (regcache != NULL && buf != NULL);
925 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
926 gdb_assert (!regcache->readonly_p);
928 /* On the sparc, writing %g0 is a no-op, so we don't even want to
929 change the registers array if something writes to this register. */
930 if (gdbarch_cannot_store_register (get_regcache_arch (regcache), regnum))
933 /* If we have a valid copy of the register, and new value == old
934 value, then don't bother doing the actual store. */
935 if (regcache_register_status (regcache, regnum) == REG_VALID
936 && (memcmp (register_buffer (regcache, regnum), buf,
937 regcache->descr->sizeof_register[regnum]) == 0))
940 chain_before_save_inferior = save_inferior_ptid ();
941 inferior_ptid = regcache->ptid;
943 target_prepare_to_store (regcache);
944 regcache_raw_set_cached_value (regcache, regnum, buf);
946 /* Register a cleanup function for invalidating the register after it is
947 written, in case of a failure. */
948 chain_before_invalidate_register
949 = make_cleanup_regcache_invalidate (regcache, regnum);
951 target_store_registers (regcache, regnum);
953 /* The target did not throw an error so we can discard invalidating the
954 register and restore the cleanup chain to what it was. */
955 discard_cleanups (chain_before_invalidate_register);
957 do_cleanups (chain_before_save_inferior);
961 regcache_cooked_write (struct regcache *regcache, int regnum,
964 gdb_assert (regnum >= 0);
965 gdb_assert (regnum < regcache->descr->nr_cooked_registers);
966 if (regnum < regcache->descr->nr_raw_registers)
967 regcache_raw_write (regcache, regnum, buf);
969 gdbarch_pseudo_register_write (regcache->descr->gdbarch, regcache,
973 /* Perform a partial register transfer using a read, modify, write
976 typedef void (regcache_read_ftype) (struct regcache *regcache, int regnum,
978 typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum,
981 static enum register_status
982 regcache_xfer_part (struct regcache *regcache, int regnum,
983 int offset, int len, void *in, const void *out,
984 enum register_status (*read) (struct regcache *regcache,
987 void (*write) (struct regcache *regcache, int regnum,
988 const gdb_byte *buf))
990 struct regcache_descr *descr = regcache->descr;
991 gdb_byte reg[MAX_REGISTER_SIZE];
993 gdb_assert (offset >= 0 && offset <= descr->sizeof_register[regnum]);
994 gdb_assert (len >= 0 && offset + len <= descr->sizeof_register[regnum]);
995 /* Something to do? */
996 if (offset + len == 0)
998 /* Read (when needed) ... */
1001 || offset + len < descr->sizeof_register[regnum])
1003 enum register_status status;
1005 gdb_assert (read != NULL);
1006 status = read (regcache, regnum, reg);
1007 if (status != REG_VALID)
1010 /* ... modify ... */
1012 memcpy (in, reg + offset, len);
1014 memcpy (reg + offset, out, len);
1015 /* ... write (when needed). */
1018 gdb_assert (write != NULL);
1019 write (regcache, regnum, reg);
1025 enum register_status
1026 regcache_raw_read_part (struct regcache *regcache, int regnum,
1027 int offset, int len, gdb_byte *buf)
1029 struct regcache_descr *descr = regcache->descr;
1031 gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers);
1032 return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL,
1033 regcache_raw_read, regcache_raw_write);
1037 regcache_raw_write_part (struct regcache *regcache, int regnum,
1038 int offset, int len, const gdb_byte *buf)
1040 struct regcache_descr *descr = regcache->descr;
1042 gdb_assert (regnum >= 0 && regnum < descr->nr_raw_registers);
1043 regcache_xfer_part (regcache, regnum, offset, len, NULL, buf,
1044 regcache_raw_read, regcache_raw_write);
1047 enum register_status
1048 regcache_cooked_read_part (struct regcache *regcache, int regnum,
1049 int offset, int len, gdb_byte *buf)
1051 struct regcache_descr *descr = regcache->descr;
1053 gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
1054 return regcache_xfer_part (regcache, regnum, offset, len, buf, NULL,
1055 regcache_cooked_read, regcache_cooked_write);
1059 regcache_cooked_write_part (struct regcache *regcache, int regnum,
1060 int offset, int len, const gdb_byte *buf)
1062 struct regcache_descr *descr = regcache->descr;
1064 gdb_assert (regnum >= 0 && regnum < descr->nr_cooked_registers);
1065 regcache_xfer_part (regcache, regnum, offset, len, NULL, buf,
1066 regcache_cooked_read, regcache_cooked_write);
1069 /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */
1072 regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf)
1077 gdb_assert (regcache != NULL);
1078 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
1079 gdb_assert (!regcache->readonly_p);
1081 regbuf = register_buffer (regcache, regnum);
1082 size = regcache->descr->sizeof_register[regnum];
1086 memcpy (regbuf, buf, size);
1087 regcache->register_status[regnum] = REG_VALID;
1091 /* This memset not strictly necessary, but better than garbage
1092 in case the register value manages to escape somewhere (due
1093 to a bug, no less). */
1094 memset (regbuf, 0, size);
1095 regcache->register_status[regnum] = REG_UNAVAILABLE;
1099 /* Collect register REGNUM from REGCACHE and store its contents in BUF. */
1102 regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf)
1107 gdb_assert (regcache != NULL && buf != NULL);
1108 gdb_assert (regnum >= 0 && regnum < regcache->descr->nr_raw_registers);
1110 regbuf = register_buffer (regcache, regnum);
1111 size = regcache->descr->sizeof_register[regnum];
1112 memcpy (buf, regbuf, size);
1115 /* Transfer a single or all registers belonging to a certain register
1116 set to or from a buffer. This is the main worker function for
1117 regcache_supply_regset and regcache_collect_regset. */
1120 regcache_transfer_regset (const struct regset *regset,
1121 const struct regcache *regcache,
1122 struct regcache *out_regcache,
1123 int regnum, const void *in_buf,
1124 void *out_buf, size_t size)
1126 const struct regcache_map_entry *map;
1127 int offs = 0, count;
1129 for (map = (const struct regcache_map_entry *) regset->regmap;
1130 (count = map->count) != 0;
1133 int regno = map->regno;
1134 int slot_size = map->size;
1136 if (slot_size == 0 && regno != REGCACHE_MAP_SKIP)
1137 slot_size = regcache->descr->sizeof_register[regno];
1139 if (regno == REGCACHE_MAP_SKIP
1141 && (regnum < regno || regnum >= regno + count)))
1142 offs += count * slot_size;
1144 else if (regnum == -1)
1145 for (; count--; regno++, offs += slot_size)
1147 if (offs + slot_size > size)
1151 regcache_raw_collect (regcache, regno,
1152 (gdb_byte *) out_buf + offs);
1154 regcache_raw_supply (out_regcache, regno, in_buf
1155 ? (const gdb_byte *) in_buf + offs
1160 /* Transfer a single register and return. */
1161 offs += (regnum - regno) * slot_size;
1162 if (offs + slot_size > size)
1166 regcache_raw_collect (regcache, regnum,
1167 (gdb_byte *) out_buf + offs);
1169 regcache_raw_supply (out_regcache, regnum, in_buf
1170 ? (const gdb_byte *) in_buf + offs
1177 /* Supply register REGNUM from BUF to REGCACHE, using the register map
1178 in REGSET. If REGNUM is -1, do this for all registers in REGSET.
1179 If BUF is NULL, set the register(s) to "unavailable" status. */
1182 regcache_supply_regset (const struct regset *regset,
1183 struct regcache *regcache,
1184 int regnum, const void *buf, size_t size)
1186 regcache_transfer_regset (regset, regcache, regcache, regnum,
1190 /* Collect register REGNUM from REGCACHE to BUF, using the register
1191 map in REGSET. If REGNUM is -1, do this for all registers in
1195 regcache_collect_regset (const struct regset *regset,
1196 const struct regcache *regcache,
1197 int regnum, void *buf, size_t size)
1199 regcache_transfer_regset (regset, regcache, NULL, regnum,
1204 /* Special handling for register PC. */
1207 regcache_read_pc (struct regcache *regcache)
1209 struct gdbarch *gdbarch = get_regcache_arch (regcache);
1213 if (gdbarch_read_pc_p (gdbarch))
1214 pc_val = gdbarch_read_pc (gdbarch, regcache);
1215 /* Else use per-frame method on get_current_frame. */
1216 else if (gdbarch_pc_regnum (gdbarch) >= 0)
1220 if (regcache_cooked_read_unsigned (regcache,
1221 gdbarch_pc_regnum (gdbarch),
1222 &raw_val) == REG_UNAVAILABLE)
1223 throw_error (NOT_AVAILABLE_ERROR, _("PC register is not available"));
1225 pc_val = gdbarch_addr_bits_remove (gdbarch, raw_val);
1228 internal_error (__FILE__, __LINE__,
1229 _("regcache_read_pc: Unable to find PC"));
1234 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
1236 struct gdbarch *gdbarch = get_regcache_arch (regcache);
1238 if (gdbarch_write_pc_p (gdbarch))
1239 gdbarch_write_pc (gdbarch, regcache, pc);
1240 else if (gdbarch_pc_regnum (gdbarch) >= 0)
1241 regcache_cooked_write_unsigned (regcache,
1242 gdbarch_pc_regnum (gdbarch), pc);
1244 internal_error (__FILE__, __LINE__,
1245 _("regcache_write_pc: Unable to update PC"));
1247 /* Writing the PC (for instance, from "load") invalidates the
1249 reinit_frame_cache ();
1254 reg_flush_command (char *command, int from_tty)
1256 /* Force-flush the register cache. */
1257 registers_changed ();
1259 printf_filtered (_("Register cache flushed.\n"));
1262 enum regcache_dump_what
1264 regcache_dump_none, regcache_dump_raw,
1265 regcache_dump_cooked, regcache_dump_groups,
1266 regcache_dump_remote
1270 regcache_dump (struct regcache *regcache, struct ui_file *file,
1271 enum regcache_dump_what what_to_dump)
1273 struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
1274 struct gdbarch *gdbarch = regcache->descr->gdbarch;
1276 int footnote_nr = 0;
1277 int footnote_register_size = 0;
1278 int footnote_register_offset = 0;
1279 int footnote_register_type_name_null = 0;
1280 long register_offset = 0;
1281 gdb_byte buf[MAX_REGISTER_SIZE];
1284 fprintf_unfiltered (file, "nr_raw_registers %d\n",
1285 regcache->descr->nr_raw_registers);
1286 fprintf_unfiltered (file, "nr_cooked_registers %d\n",
1287 regcache->descr->nr_cooked_registers);
1288 fprintf_unfiltered (file, "sizeof_raw_registers %ld\n",
1289 regcache->descr->sizeof_raw_registers);
1290 fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n",
1291 regcache->descr->sizeof_raw_register_status);
1292 fprintf_unfiltered (file, "gdbarch_num_regs %d\n",
1293 gdbarch_num_regs (gdbarch));
1294 fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n",
1295 gdbarch_num_pseudo_regs (gdbarch));
1298 gdb_assert (regcache->descr->nr_cooked_registers
1299 == (gdbarch_num_regs (gdbarch)
1300 + gdbarch_num_pseudo_regs (gdbarch)));
1302 for (regnum = -1; regnum < regcache->descr->nr_cooked_registers; regnum++)
1306 fprintf_unfiltered (file, " %-10s", "Name");
1309 const char *p = gdbarch_register_name (gdbarch, regnum);
1313 else if (p[0] == '\0')
1315 fprintf_unfiltered (file, " %-10s", p);
1320 fprintf_unfiltered (file, " %4s", "Nr");
1322 fprintf_unfiltered (file, " %4d", regnum);
1324 /* Relative number. */
1326 fprintf_unfiltered (file, " %4s", "Rel");
1327 else if (regnum < gdbarch_num_regs (gdbarch))
1328 fprintf_unfiltered (file, " %4d", regnum);
1330 fprintf_unfiltered (file, " %4d",
1331 (regnum - gdbarch_num_regs (gdbarch)));
1335 fprintf_unfiltered (file, " %6s ", "Offset");
1338 fprintf_unfiltered (file, " %6ld",
1339 regcache->descr->register_offset[regnum]);
1340 if (register_offset != regcache->descr->register_offset[regnum]
1342 && (regcache->descr->register_offset[regnum]
1343 != (regcache->descr->register_offset[regnum - 1]
1344 + regcache->descr->sizeof_register[regnum - 1])))
1347 if (!footnote_register_offset)
1348 footnote_register_offset = ++footnote_nr;
1349 fprintf_unfiltered (file, "*%d", footnote_register_offset);
1352 fprintf_unfiltered (file, " ");
1353 register_offset = (regcache->descr->register_offset[regnum]
1354 + regcache->descr->sizeof_register[regnum]);
1359 fprintf_unfiltered (file, " %5s ", "Size");
1361 fprintf_unfiltered (file, " %5ld",
1362 regcache->descr->sizeof_register[regnum]);
1372 static const char blt[] = "builtin_type";
1374 t = TYPE_NAME (register_type (regcache->descr->gdbarch, regnum));
1379 if (!footnote_register_type_name_null)
1380 footnote_register_type_name_null = ++footnote_nr;
1381 n = xstrprintf ("*%d", footnote_register_type_name_null);
1382 make_cleanup (xfree, n);
1385 /* Chop a leading builtin_type. */
1386 if (startswith (t, blt))
1389 fprintf_unfiltered (file, " %-15s", t);
1392 /* Leading space always present. */
1393 fprintf_unfiltered (file, " ");
1396 if (what_to_dump == regcache_dump_raw)
1399 fprintf_unfiltered (file, "Raw value");
1400 else if (regnum >= regcache->descr->nr_raw_registers)
1401 fprintf_unfiltered (file, "<cooked>");
1402 else if (regcache_register_status (regcache, regnum) == REG_UNKNOWN)
1403 fprintf_unfiltered (file, "<invalid>");
1404 else if (regcache_register_status (regcache, regnum) == REG_UNAVAILABLE)
1405 fprintf_unfiltered (file, "<unavailable>");
1408 regcache_raw_read (regcache, regnum, buf);
1409 print_hex_chars (file, buf,
1410 regcache->descr->sizeof_register[regnum],
1411 gdbarch_byte_order (gdbarch));
1415 /* Value, cooked. */
1416 if (what_to_dump == regcache_dump_cooked)
1419 fprintf_unfiltered (file, "Cooked value");
1422 enum register_status status;
1424 status = regcache_cooked_read (regcache, regnum, buf);
1425 if (status == REG_UNKNOWN)
1426 fprintf_unfiltered (file, "<invalid>");
1427 else if (status == REG_UNAVAILABLE)
1428 fprintf_unfiltered (file, "<unavailable>");
1430 print_hex_chars (file, buf,
1431 regcache->descr->sizeof_register[regnum],
1432 gdbarch_byte_order (gdbarch));
1436 /* Group members. */
1437 if (what_to_dump == regcache_dump_groups)
1440 fprintf_unfiltered (file, "Groups");
1443 const char *sep = "";
1444 struct reggroup *group;
1446 for (group = reggroup_next (gdbarch, NULL);
1448 group = reggroup_next (gdbarch, group))
1450 if (gdbarch_register_reggroup_p (gdbarch, regnum, group))
1452 fprintf_unfiltered (file,
1453 "%s%s", sep, reggroup_name (group));
1460 /* Remote packet configuration. */
1461 if (what_to_dump == regcache_dump_remote)
1465 fprintf_unfiltered (file, "Rmt Nr g/G Offset");
1467 else if (regnum < regcache->descr->nr_raw_registers)
1471 if (remote_register_number_and_offset (get_regcache_arch (regcache), regnum,
1473 fprintf_unfiltered (file, "%7d %11d", pnum, poffset);
1477 fprintf_unfiltered (file, "\n");
1480 if (footnote_register_size)
1481 fprintf_unfiltered (file, "*%d: Inconsistent register sizes.\n",
1482 footnote_register_size);
1483 if (footnote_register_offset)
1484 fprintf_unfiltered (file, "*%d: Inconsistent register offsets.\n",
1485 footnote_register_offset);
1486 if (footnote_register_type_name_null)
1487 fprintf_unfiltered (file,
1488 "*%d: Register type's name NULL.\n",
1489 footnote_register_type_name_null);
1490 do_cleanups (cleanups);
1494 regcache_print (char *args, enum regcache_dump_what what_to_dump)
1497 regcache_dump (get_current_regcache (), gdb_stdout, what_to_dump);
1500 struct cleanup *cleanups;
1501 struct ui_file *file = gdb_fopen (args, "w");
1504 perror_with_name (_("maintenance print architecture"));
1505 cleanups = make_cleanup_ui_file_delete (file);
1506 regcache_dump (get_current_regcache (), file, what_to_dump);
1507 do_cleanups (cleanups);
1512 maintenance_print_registers (char *args, int from_tty)
1514 regcache_print (args, regcache_dump_none);
1518 maintenance_print_raw_registers (char *args, int from_tty)
1520 regcache_print (args, regcache_dump_raw);
1524 maintenance_print_cooked_registers (char *args, int from_tty)
1526 regcache_print (args, regcache_dump_cooked);
1530 maintenance_print_register_groups (char *args, int from_tty)
1532 regcache_print (args, regcache_dump_groups);
1536 maintenance_print_remote_registers (char *args, int from_tty)
1538 regcache_print (args, regcache_dump_remote);
1541 extern initialize_file_ftype _initialize_regcache; /* -Wmissing-prototype */
1544 _initialize_regcache (void)
1546 regcache_descr_handle
1547 = gdbarch_data_register_post_init (init_regcache_descr);
1549 observer_attach_target_changed (regcache_observer_target_changed);
1550 observer_attach_thread_ptid_changed (regcache_thread_ptid_changed);
1552 add_com ("flushregs", class_maintenance, reg_flush_command,
1553 _("Force gdb to flush its register cache (maintainer command)"));
1555 add_cmd ("registers", class_maintenance, maintenance_print_registers,
1556 _("Print the internal register configuration.\n"
1557 "Takes an optional file parameter."), &maintenanceprintlist);
1558 add_cmd ("raw-registers", class_maintenance,
1559 maintenance_print_raw_registers,
1560 _("Print the internal register configuration "
1561 "including raw values.\n"
1562 "Takes an optional file parameter."), &maintenanceprintlist);
1563 add_cmd ("cooked-registers", class_maintenance,
1564 maintenance_print_cooked_registers,
1565 _("Print the internal register configuration "
1566 "including cooked values.\n"
1567 "Takes an optional file parameter."), &maintenanceprintlist);
1568 add_cmd ("register-groups", class_maintenance,
1569 maintenance_print_register_groups,
1570 _("Print the internal register configuration "
1571 "including each register's group.\n"
1572 "Takes an optional file parameter."),
1573 &maintenanceprintlist);
1574 add_cmd ("remote-registers", class_maintenance,
1575 maintenance_print_remote_registers, _("\
1576 Print the internal register configuration including each register's\n\
1577 remote register number and buffer offset in the g/G packets.\n\
1578 Takes an optional file parameter."),
1579 &maintenanceprintlist);