1 /* Cache and manage the values of registers for GDB, the GNU debugger.
3 Copyright (C) 1986-2017 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 regcache::regcache (gdbarch *gdbarch, address_space *aspace_,
192 : m_aspace (aspace_), m_readonly_p (readonly_p_)
194 gdb_assert (gdbarch != NULL);
195 m_descr = regcache_descr (gdbarch);
199 m_registers = XCNEWVEC (gdb_byte, m_descr->sizeof_cooked_registers);
200 m_register_status = XCNEWVEC (signed char,
201 m_descr->sizeof_cooked_register_status);
205 m_registers = XCNEWVEC (gdb_byte, m_descr->sizeof_raw_registers);
206 m_register_status = XCNEWVEC (signed char,
207 m_descr->sizeof_raw_register_status);
209 m_ptid = minus_one_ptid;
212 static enum register_status
213 do_cooked_read (void *src, int regnum, gdb_byte *buf)
215 struct regcache *regcache = (struct regcache *) src;
217 return regcache_cooked_read (regcache, regnum, buf);
220 regcache::regcache (readonly_t, const regcache &src)
221 : regcache (src.arch (), src.aspace (), true)
223 gdb_assert (!src.m_readonly_p);
224 save (do_cooked_read, (void *) &src);
228 regcache::arch () const
230 return m_descr->gdbarch;
233 /* See regcache.h. */
236 regcache_get_ptid (const struct regcache *regcache)
238 gdb_assert (!ptid_equal (regcache->ptid (), minus_one_ptid));
240 return regcache->ptid ();
244 regcache_xmalloc (struct gdbarch *gdbarch, struct address_space *aspace)
246 return new regcache (gdbarch, aspace);
250 regcache_xfree (struct regcache *regcache)
252 if (regcache == NULL)
259 do_regcache_xfree (void *data)
261 regcache_xfree ((struct regcache *) data);
265 make_cleanup_regcache_xfree (struct regcache *regcache)
267 return make_cleanup (do_regcache_xfree, regcache);
270 /* Cleanup routines for invalidating a register. */
272 struct register_to_invalidate
274 struct regcache *regcache;
279 do_regcache_invalidate (void *data)
281 struct register_to_invalidate *reg = (struct register_to_invalidate *) data;
283 regcache_invalidate (reg->regcache, reg->regnum);
286 static struct cleanup *
287 make_cleanup_regcache_invalidate (struct regcache *regcache, int regnum)
289 struct register_to_invalidate* reg = XNEW (struct register_to_invalidate);
291 reg->regcache = regcache;
292 reg->regnum = regnum;
293 return make_cleanup_dtor (do_regcache_invalidate, (void *) reg, xfree);
296 /* Return REGCACHE's architecture. */
299 get_regcache_arch (const struct regcache *regcache)
301 return regcache->arch ();
304 struct address_space *
305 get_regcache_aspace (const struct regcache *regcache)
307 return regcache->aspace ();
310 /* Return a pointer to register REGNUM's buffer cache. */
313 regcache::register_buffer (int regnum) const
315 return m_registers + m_descr->register_offset[regnum];
319 regcache_save (struct regcache *regcache,
320 regcache_cooked_read_ftype *cooked_read, void *src)
322 regcache->save (cooked_read, src);
326 regcache::save (regcache_cooked_read_ftype *cooked_read,
329 struct gdbarch *gdbarch = m_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 (m_readonly_p);
337 /* Clear the dest. */
338 memset (m_registers, 0, m_descr->sizeof_cooked_registers);
339 memset (m_register_status, 0, m_descr->sizeof_cooked_register_status);
340 /* Copy over any registers (identified by their membership in the
341 save_reggroup) and mark them as valid. The full [0 .. gdbarch_num_regs +
342 gdbarch_num_pseudo_regs) range is checked since some architectures need
343 to save/restore `cooked' registers that live in memory. */
344 for (regnum = 0; regnum < m_descr->nr_cooked_registers; regnum++)
346 if (gdbarch_register_reggroup_p (gdbarch, regnum, save_reggroup))
348 enum register_status status = cooked_read (src, regnum, buf);
350 if (status == REG_VALID)
351 memcpy (register_buffer (regnum), buf,
352 register_size (gdbarch, regnum));
355 gdb_assert (status != REG_UNKNOWN);
357 memset (register_buffer (regnum), 0,
358 register_size (gdbarch, regnum));
360 m_register_status[regnum] = status;
366 regcache::restore (struct regcache *src)
368 struct gdbarch *gdbarch = m_descr->gdbarch;
371 /* The dst had better not be read-only. If it is, the `restore'
372 doesn't make much sense. */
373 gdb_assert (!m_readonly_p);
374 gdb_assert (src->m_readonly_p);
375 /* Copy over any registers, being careful to only restore those that
376 were both saved and need to be restored. The full [0 .. gdbarch_num_regs
377 + gdbarch_num_pseudo_regs) range is checked since some architectures need
378 to save/restore `cooked' registers that live in memory. */
379 for (regnum = 0; regnum < m_descr->nr_cooked_registers; regnum++)
381 if (gdbarch_register_reggroup_p (gdbarch, regnum, restore_reggroup))
383 if (src->m_register_status[regnum] == REG_VALID)
384 cooked_write (regnum, src->register_buffer (regnum));
390 regcache_cpy (struct regcache *dst, struct regcache *src)
392 gdb_assert (src != NULL && dst != NULL);
393 gdb_assert (src->m_descr->gdbarch == dst->m_descr->gdbarch);
394 gdb_assert (src != dst);
395 gdb_assert (src->m_readonly_p || dst->m_readonly_p);
397 if (!src->m_readonly_p)
398 regcache_save (dst, do_cooked_read, src);
399 else if (!dst->m_readonly_p)
402 dst->cpy_no_passthrough (src);
405 /* Copy/duplicate the contents of a register cache. Unlike regcache_cpy,
406 which is pass-through, this does not go through to the target.
407 Only values values already in the cache are transferred. The SRC and DST
408 buffers must not overlap. */
411 regcache::cpy_no_passthrough (struct regcache *src)
413 gdb_assert (src != NULL);
414 gdb_assert (src->m_descr->gdbarch == m_descr->gdbarch);
415 /* NOTE: cagney/2002-05-17: Don't let the caller do a no-passthrough
416 move of data into a thread's regcache. Doing this would be silly
417 - it would mean that regcache->register_status would be
418 completely invalid. */
419 gdb_assert (m_readonly_p && src->m_readonly_p);
421 memcpy (m_registers, src->m_registers,
422 m_descr->sizeof_cooked_registers);
423 memcpy (m_register_status, src->m_register_status,
424 m_descr->sizeof_cooked_register_status);
428 regcache_dup (struct regcache *src)
430 return new regcache (regcache::readonly, *src);
434 regcache_register_status (const struct regcache *regcache, int regnum)
436 gdb_assert (regcache != NULL);
437 return regcache->get_register_status (regnum);
441 regcache::get_register_status (int regnum) const
443 gdb_assert (regnum >= 0);
445 gdb_assert (regnum < m_descr->nr_cooked_registers);
447 gdb_assert (regnum < m_descr->nr_raw_registers);
449 return (enum register_status) m_register_status[regnum];
453 regcache_invalidate (struct regcache *regcache, int regnum)
455 gdb_assert (regcache != NULL);
456 regcache->invalidate (regnum);
460 regcache::invalidate (int regnum)
462 gdb_assert (regnum >= 0);
463 gdb_assert (!m_readonly_p);
464 gdb_assert (regnum < m_descr->nr_raw_registers);
465 m_register_status[regnum] = REG_UNKNOWN;
468 /* Global structure containing the current regcache. */
470 /* NOTE: this is a write-through cache. There is no "dirty" bit for
471 recording if the register values have been changed (eg. by the
472 user). Therefore all registers must be written back to the
473 target when appropriate. */
477 struct regcache *regcache;
478 struct regcache_list *next;
481 static struct regcache_list *current_regcache;
484 get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
485 struct address_space *aspace)
487 struct regcache_list *list;
488 struct regcache *new_regcache;
490 for (list = current_regcache; list; list = list->next)
491 if (ptid_equal (list->regcache->ptid (), ptid)
492 && get_regcache_arch (list->regcache) == gdbarch)
493 return list->regcache;
495 new_regcache = new regcache (gdbarch, aspace, false);
496 new_regcache->set_ptid (ptid);
498 list = XNEW (struct regcache_list);
499 list->regcache = new_regcache;
500 list->next = current_regcache;
501 current_regcache = list;
507 get_thread_arch_regcache (ptid_t ptid, struct gdbarch *gdbarch)
509 struct address_space *aspace;
511 /* For the benefit of "maint print registers" & co when debugging an
512 executable, allow dumping the regcache even when there is no
513 thread selected (target_thread_address_space internal-errors if
514 no address space is found). Note that normal user commands will
515 fail higher up on the call stack due to no
516 target_has_registers. */
517 aspace = (ptid_equal (null_ptid, ptid)
519 : target_thread_address_space (ptid));
521 return get_thread_arch_aspace_regcache (ptid, gdbarch, aspace);
524 static ptid_t current_thread_ptid;
525 static struct gdbarch *current_thread_arch;
528 get_thread_regcache (ptid_t ptid)
530 if (!current_thread_arch || !ptid_equal (current_thread_ptid, ptid))
532 current_thread_ptid = ptid;
533 current_thread_arch = target_thread_architecture (ptid);
536 return get_thread_arch_regcache (ptid, current_thread_arch);
540 get_current_regcache (void)
542 return get_thread_regcache (inferior_ptid);
545 /* See common/common-regcache.h. */
548 get_thread_regcache_for_ptid (ptid_t ptid)
550 return get_thread_regcache (ptid);
553 /* Observer for the target_changed event. */
556 regcache_observer_target_changed (struct target_ops *target)
558 registers_changed ();
561 /* Update global variables old ptids to hold NEW_PTID if they were
564 regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid)
566 struct regcache_list *list;
568 for (list = current_regcache; list; list = list->next)
569 if (ptid_equal (list->regcache->ptid (), old_ptid))
570 list->regcache->set_ptid (new_ptid);
573 /* Low level examining and depositing of registers.
575 The caller is responsible for making sure that the inferior is
576 stopped before calling the fetching routines, or it will get
577 garbage. (a change from GDB version 3, in which the caller got the
578 value from the last stop). */
580 /* REGISTERS_CHANGED ()
582 Indicate that registers may have changed, so invalidate the cache. */
585 registers_changed_ptid (ptid_t ptid)
587 struct regcache_list *list, **list_link;
589 list = current_regcache;
590 list_link = ¤t_regcache;
593 if (ptid_match (list->regcache->ptid (), ptid))
595 struct regcache_list *dead = list;
597 *list_link = list->next;
598 regcache_xfree (list->regcache);
604 list_link = &list->next;
608 if (ptid_match (current_thread_ptid, ptid))
610 current_thread_ptid = null_ptid;
611 current_thread_arch = NULL;
614 if (ptid_match (inferior_ptid, ptid))
616 /* We just deleted the regcache of the current thread. Need to
617 forget about any frames we have cached, too. */
618 reinit_frame_cache ();
623 registers_changed (void)
625 registers_changed_ptid (minus_one_ptid);
627 /* Force cleanup of any alloca areas if using C alloca instead of
628 a builtin alloca. This particular call is used to clean up
629 areas allocated by low level target code which may build up
630 during lengthy interactions between gdb and the target before
631 gdb gives control to the user (ie watchpoints). */
636 regcache_raw_update (struct regcache *regcache, int regnum)
638 gdb_assert (regcache != NULL);
640 regcache->raw_update (regnum);
644 regcache::raw_update (int regnum)
646 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
648 /* Make certain that the register cache is up-to-date with respect
649 to the current thread. This switching shouldn't be necessary
650 only there is still only one target side register cache. Sigh!
651 On the bright side, at least there is a regcache object. */
653 if (!m_readonly_p && get_register_status (regnum) == REG_UNKNOWN)
655 target_fetch_registers (this, regnum);
657 /* A number of targets can't access the whole set of raw
658 registers (because the debug API provides no means to get at
660 if (m_register_status[regnum] == REG_UNKNOWN)
661 m_register_status[regnum] = REG_UNAVAILABLE;
666 regcache_raw_read (struct regcache *regcache, int regnum, gdb_byte *buf)
668 return regcache->raw_read (regnum, buf);
672 regcache::raw_read (int regnum, gdb_byte *buf)
674 gdb_assert (buf != NULL);
677 if (m_register_status[regnum] != REG_VALID)
678 memset (buf, 0, m_descr->sizeof_register[regnum]);
680 memcpy (buf, register_buffer (regnum),
681 m_descr->sizeof_register[regnum]);
683 return (enum register_status) m_register_status[regnum];
687 regcache_raw_read_signed (struct regcache *regcache, int regnum, LONGEST *val)
689 gdb_assert (regcache != NULL);
690 return regcache->raw_read_signed (regnum, val);
694 regcache::raw_read_signed (int regnum, LONGEST *val)
697 enum register_status status;
699 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
700 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
701 status = raw_read (regnum, buf);
702 if (status == REG_VALID)
703 *val = extract_signed_integer
704 (buf, m_descr->sizeof_register[regnum],
705 gdbarch_byte_order (m_descr->gdbarch));
712 regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
715 gdb_assert (regcache != NULL);
716 return regcache->raw_read_unsigned (regnum, val);
721 regcache::raw_read_unsigned (int regnum, ULONGEST *val)
724 enum register_status status;
726 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
727 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
728 status = raw_read (regnum, buf);
729 if (status == REG_VALID)
730 *val = extract_unsigned_integer
731 (buf, m_descr->sizeof_register[regnum],
732 gdbarch_byte_order (m_descr->gdbarch));
739 regcache_raw_write_signed (struct regcache *regcache, int regnum, LONGEST val)
741 gdb_assert (regcache != NULL);
742 regcache->raw_write_signed (regnum, val);
746 regcache::raw_write_signed (int regnum, LONGEST val)
750 gdb_assert (regnum >=0 && regnum < m_descr->nr_raw_registers);
751 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
752 store_signed_integer (buf, m_descr->sizeof_register[regnum],
753 gdbarch_byte_order (m_descr->gdbarch), val);
754 raw_write (regnum, buf);
758 regcache_raw_write_unsigned (struct regcache *regcache, int regnum,
761 gdb_assert (regcache != NULL);
762 regcache->raw_write_unsigned (regnum, val);
766 regcache::raw_write_unsigned (int regnum, ULONGEST val)
770 gdb_assert (regnum >=0 && regnum < m_descr->nr_raw_registers);
771 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
772 store_unsigned_integer (buf, m_descr->sizeof_register[regnum],
773 gdbarch_byte_order (m_descr->gdbarch), val);
774 raw_write (regnum, buf);
778 regcache_raw_get_signed (struct regcache *regcache, int regnum)
781 enum register_status status;
783 status = regcache_raw_read_signed (regcache, regnum, &value);
784 if (status == REG_UNAVAILABLE)
785 throw_error (NOT_AVAILABLE_ERROR,
786 _("Register %d is not available"), regnum);
791 regcache_cooked_read (struct regcache *regcache, int regnum, gdb_byte *buf)
793 return regcache->cooked_read (regnum, buf);
797 regcache::cooked_read (int regnum, gdb_byte *buf)
799 gdb_assert (regnum >= 0);
800 gdb_assert (regnum < m_descr->nr_cooked_registers);
801 if (regnum < m_descr->nr_raw_registers)
802 return raw_read (regnum, buf);
803 else if (m_readonly_p
804 && m_register_status[regnum] != REG_UNKNOWN)
806 /* Read-only register cache, perhaps the cooked value was
808 if (m_register_status[regnum] == REG_VALID)
809 memcpy (buf, register_buffer (regnum),
810 m_descr->sizeof_register[regnum]);
812 memset (buf, 0, m_descr->sizeof_register[regnum]);
814 return (enum register_status) m_register_status[regnum];
816 else if (gdbarch_pseudo_register_read_value_p (m_descr->gdbarch))
818 struct value *mark, *computed;
819 enum register_status result = REG_VALID;
821 mark = value_mark ();
823 computed = gdbarch_pseudo_register_read_value (m_descr->gdbarch,
825 if (value_entirely_available (computed))
826 memcpy (buf, value_contents_raw (computed),
827 m_descr->sizeof_register[regnum]);
830 memset (buf, 0, m_descr->sizeof_register[regnum]);
831 result = REG_UNAVAILABLE;
834 value_free_to_mark (mark);
839 return gdbarch_pseudo_register_read (m_descr->gdbarch, this,
844 regcache_cooked_read_value (struct regcache *regcache, int regnum)
846 return regcache->cooked_read_value (regnum);
850 regcache::cooked_read_value (int regnum)
852 gdb_assert (regnum >= 0);
853 gdb_assert (regnum < m_descr->nr_cooked_registers);
855 if (regnum < m_descr->nr_raw_registers
856 || (m_readonly_p && m_register_status[regnum] != REG_UNKNOWN)
857 || !gdbarch_pseudo_register_read_value_p (m_descr->gdbarch))
859 struct value *result;
861 result = allocate_value (register_type (m_descr->gdbarch, regnum));
862 VALUE_LVAL (result) = lval_register;
863 VALUE_REGNUM (result) = regnum;
865 /* It is more efficient in general to do this delegation in this
866 direction than in the other one, even though the value-based
868 if (cooked_read (regnum,
869 value_contents_raw (result)) == REG_UNAVAILABLE)
870 mark_value_bytes_unavailable (result, 0,
871 TYPE_LENGTH (value_type (result)));
876 return gdbarch_pseudo_register_read_value (m_descr->gdbarch,
881 regcache_cooked_read_signed (struct regcache *regcache, int regnum,
884 gdb_assert (regcache != NULL);
885 return regcache->cooked_read_signed (regnum, val);
889 regcache::cooked_read_signed (int regnum, LONGEST *val)
891 enum register_status status;
894 gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
895 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
896 status = cooked_read (regnum, buf);
897 if (status == REG_VALID)
898 *val = extract_signed_integer
899 (buf, m_descr->sizeof_register[regnum],
900 gdbarch_byte_order (m_descr->gdbarch));
907 regcache_cooked_read_unsigned (struct regcache *regcache, int regnum,
910 gdb_assert (regcache != NULL);
911 return regcache->cooked_read_unsigned (regnum, val);
915 regcache::cooked_read_unsigned (int regnum, ULONGEST *val)
917 enum register_status status;
920 gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
921 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
922 status = cooked_read (regnum, buf);
923 if (status == REG_VALID)
924 *val = extract_unsigned_integer
925 (buf, m_descr->sizeof_register[regnum],
926 gdbarch_byte_order (m_descr->gdbarch));
933 regcache_cooked_write_signed (struct regcache *regcache, int regnum,
936 gdb_assert (regcache != NULL);
937 regcache->cooked_write_signed (regnum, val);
941 regcache::cooked_write_signed (int regnum, LONGEST val)
945 gdb_assert (regnum >=0 && regnum < m_descr->nr_cooked_registers);
946 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
947 store_signed_integer (buf, m_descr->sizeof_register[regnum],
948 gdbarch_byte_order (m_descr->gdbarch), val);
949 cooked_write (regnum, buf);
953 regcache_cooked_write_unsigned (struct regcache *regcache, int regnum,
956 gdb_assert (regcache != NULL);
957 regcache->cooked_write_unsigned (regnum, val);
961 regcache::cooked_write_unsigned (int regnum, ULONGEST val)
965 gdb_assert (regnum >=0 && regnum < m_descr->nr_cooked_registers);
966 buf = (gdb_byte *) alloca (m_descr->sizeof_register[regnum]);
967 store_unsigned_integer (buf, m_descr->sizeof_register[regnum],
968 gdbarch_byte_order (m_descr->gdbarch), val);
969 cooked_write (regnum, buf);
972 /* See regcache.h. */
975 regcache_raw_set_cached_value (struct regcache *regcache, int regnum,
978 regcache->raw_set_cached_value (regnum, buf);
982 regcache::raw_set_cached_value (int regnum, const gdb_byte *buf)
984 memcpy (register_buffer (regnum), buf,
985 m_descr->sizeof_register[regnum]);
986 m_register_status[regnum] = REG_VALID;
990 regcache_raw_write (struct regcache *regcache, int regnum,
993 gdb_assert (regcache != NULL && buf != NULL);
994 regcache->raw_write (regnum, buf);
998 regcache::raw_write (int regnum, const gdb_byte *buf)
1000 struct cleanup *old_chain;
1002 gdb_assert (buf != NULL);
1003 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
1004 gdb_assert (!m_readonly_p);
1006 /* On the sparc, writing %g0 is a no-op, so we don't even want to
1007 change the registers array if something writes to this register. */
1008 if (gdbarch_cannot_store_register (arch (), regnum))
1011 /* If we have a valid copy of the register, and new value == old
1012 value, then don't bother doing the actual store. */
1013 if (get_register_status (regnum) == REG_VALID
1014 && (memcmp (register_buffer (regnum), buf,
1015 m_descr->sizeof_register[regnum]) == 0))
1018 target_prepare_to_store (this);
1019 raw_set_cached_value (regnum, buf);
1021 /* Register a cleanup function for invalidating the register after it is
1022 written, in case of a failure. */
1023 old_chain = make_cleanup_regcache_invalidate (this, regnum);
1025 target_store_registers (this, regnum);
1027 /* The target did not throw an error so we can discard invalidating the
1028 register and restore the cleanup chain to what it was. */
1029 discard_cleanups (old_chain);
1033 regcache_cooked_write (struct regcache *regcache, int regnum,
1034 const gdb_byte *buf)
1036 regcache->cooked_write (regnum, buf);
1040 regcache::cooked_write (int regnum, const gdb_byte *buf)
1042 gdb_assert (regnum >= 0);
1043 gdb_assert (regnum < m_descr->nr_cooked_registers);
1044 if (regnum < m_descr->nr_raw_registers)
1045 raw_write (regnum, buf);
1047 gdbarch_pseudo_register_write (m_descr->gdbarch, this,
1051 /* Perform a partial register transfer using a read, modify, write
1054 typedef void (regcache_read_ftype) (struct regcache *regcache, int regnum,
1056 typedef void (regcache_write_ftype) (struct regcache *regcache, int regnum,
1059 enum register_status
1060 regcache::xfer_part (int regnum, int offset, int len, void *in,
1062 enum register_status (*read) (struct regcache *regcache,
1065 void (*write) (struct regcache *regcache, int regnum,
1066 const gdb_byte *buf))
1068 struct gdbarch *gdbarch = arch ();
1069 gdb_byte *reg = (gdb_byte *) alloca (register_size (gdbarch, regnum));
1071 gdb_assert (offset >= 0 && offset <= m_descr->sizeof_register[regnum]);
1072 gdb_assert (len >= 0 && offset + len <= m_descr->sizeof_register[regnum]);
1073 /* Something to do? */
1074 if (offset + len == 0)
1076 /* Read (when needed) ... */
1079 || offset + len < m_descr->sizeof_register[regnum])
1081 enum register_status status;
1083 gdb_assert (read != NULL);
1084 status = read (this, regnum, reg);
1085 if (status != REG_VALID)
1088 /* ... modify ... */
1090 memcpy (in, reg + offset, len);
1092 memcpy (reg + offset, out, len);
1093 /* ... write (when needed). */
1096 gdb_assert (write != NULL);
1097 write (this, regnum, reg);
1103 enum register_status
1104 regcache_raw_read_part (struct regcache *regcache, int regnum,
1105 int offset, int len, gdb_byte *buf)
1107 return regcache->raw_read_part (regnum, offset, len, buf);
1110 enum register_status
1111 regcache::raw_read_part (int regnum, int offset, int len, gdb_byte *buf)
1113 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
1114 return xfer_part (regnum, offset, len, buf, NULL,
1115 regcache_raw_read, regcache_raw_write);
1119 regcache_raw_write_part (struct regcache *regcache, int regnum,
1120 int offset, int len, const gdb_byte *buf)
1122 regcache->raw_write_part (regnum, offset, len, buf);
1126 regcache::raw_write_part (int regnum, int offset, int len,
1127 const gdb_byte *buf)
1129 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
1130 xfer_part (regnum, offset, len, NULL, buf, regcache_raw_read,
1131 regcache_raw_write);
1134 enum register_status
1135 regcache_cooked_read_part (struct regcache *regcache, int regnum,
1136 int offset, int len, gdb_byte *buf)
1138 return regcache->cooked_read_part (regnum, offset, len, buf);
1142 enum register_status
1143 regcache::cooked_read_part (int regnum, int offset, int len, gdb_byte *buf)
1145 gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
1146 return xfer_part (regnum, offset, len, buf, NULL,
1147 regcache_cooked_read, regcache_cooked_write);
1151 regcache_cooked_write_part (struct regcache *regcache, int regnum,
1152 int offset, int len, const gdb_byte *buf)
1154 regcache->cooked_write_part (regnum, offset, len, buf);
1158 regcache::cooked_write_part (int regnum, int offset, int len,
1159 const gdb_byte *buf)
1161 gdb_assert (regnum >= 0 && regnum < m_descr->nr_cooked_registers);
1162 xfer_part (regnum, offset, len, NULL, buf,
1163 regcache_cooked_read, regcache_cooked_write);
1166 /* Supply register REGNUM, whose contents are stored in BUF, to REGCACHE. */
1169 regcache_raw_supply (struct regcache *regcache, int regnum, const void *buf)
1171 gdb_assert (regcache != NULL);
1172 regcache->raw_supply (regnum, buf);
1176 regcache::raw_supply (int regnum, const void *buf)
1181 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
1182 gdb_assert (!m_readonly_p);
1184 regbuf = register_buffer (regnum);
1185 size = m_descr->sizeof_register[regnum];
1189 memcpy (regbuf, buf, size);
1190 m_register_status[regnum] = REG_VALID;
1194 /* This memset not strictly necessary, but better than garbage
1195 in case the register value manages to escape somewhere (due
1196 to a bug, no less). */
1197 memset (regbuf, 0, size);
1198 m_register_status[regnum] = REG_UNAVAILABLE;
1202 /* Collect register REGNUM from REGCACHE and store its contents in BUF. */
1205 regcache_raw_collect (const struct regcache *regcache, int regnum, void *buf)
1207 gdb_assert (regcache != NULL && buf != NULL);
1208 regcache->raw_collect (regnum, buf);
1212 regcache::raw_collect (int regnum, void *buf) const
1217 gdb_assert (buf != NULL);
1218 gdb_assert (regnum >= 0 && regnum < m_descr->nr_raw_registers);
1220 regbuf = register_buffer (regnum);
1221 size = m_descr->sizeof_register[regnum];
1222 memcpy (buf, regbuf, size);
1225 /* Transfer a single or all registers belonging to a certain register
1226 set to or from a buffer. This is the main worker function for
1227 regcache_supply_regset and regcache_collect_regset. */
1230 regcache::transfer_regset (const struct regset *regset,
1231 struct regcache *out_regcache,
1232 int regnum, const void *in_buf,
1233 void *out_buf, size_t size) const
1235 const struct regcache_map_entry *map;
1236 int offs = 0, count;
1238 for (map = (const struct regcache_map_entry *) regset->regmap;
1239 (count = map->count) != 0;
1242 int regno = map->regno;
1243 int slot_size = map->size;
1245 if (slot_size == 0 && regno != REGCACHE_MAP_SKIP)
1246 slot_size = m_descr->sizeof_register[regno];
1248 if (regno == REGCACHE_MAP_SKIP
1250 && (regnum < regno || regnum >= regno + count)))
1251 offs += count * slot_size;
1253 else if (regnum == -1)
1254 for (; count--; regno++, offs += slot_size)
1256 if (offs + slot_size > size)
1260 raw_collect (regno, (gdb_byte *) out_buf + offs);
1262 out_regcache->raw_supply (regno, in_buf
1263 ? (const gdb_byte *) in_buf + offs
1268 /* Transfer a single register and return. */
1269 offs += (regnum - regno) * slot_size;
1270 if (offs + slot_size > size)
1274 raw_collect (regnum, (gdb_byte *) out_buf + offs);
1276 out_regcache->raw_supply (regnum, in_buf
1277 ? (const gdb_byte *) in_buf + offs
1284 /* Supply register REGNUM from BUF to REGCACHE, using the register map
1285 in REGSET. If REGNUM is -1, do this for all registers in REGSET.
1286 If BUF is NULL, set the register(s) to "unavailable" status. */
1289 regcache_supply_regset (const struct regset *regset,
1290 struct regcache *regcache,
1291 int regnum, const void *buf, size_t size)
1293 regcache->supply_regset (regset, regnum, buf, size);
1297 regcache::supply_regset (const struct regset *regset,
1298 int regnum, const void *buf, size_t size)
1300 transfer_regset (regset, this, regnum, buf, NULL, size);
1303 /* Collect register REGNUM from REGCACHE to BUF, using the register
1304 map in REGSET. If REGNUM is -1, do this for all registers in
1308 regcache_collect_regset (const struct regset *regset,
1309 const struct regcache *regcache,
1310 int regnum, void *buf, size_t size)
1312 regcache->collect_regset (regset, regnum, buf, size);
1316 regcache::collect_regset (const struct regset *regset,
1317 int regnum, void *buf, size_t size) const
1319 transfer_regset (regset, NULL, regnum, NULL, buf, size);
1323 /* Special handling for register PC. */
1326 regcache_read_pc (struct regcache *regcache)
1328 struct gdbarch *gdbarch = get_regcache_arch (regcache);
1332 if (gdbarch_read_pc_p (gdbarch))
1333 pc_val = gdbarch_read_pc (gdbarch, regcache);
1334 /* Else use per-frame method on get_current_frame. */
1335 else if (gdbarch_pc_regnum (gdbarch) >= 0)
1339 if (regcache_cooked_read_unsigned (regcache,
1340 gdbarch_pc_regnum (gdbarch),
1341 &raw_val) == REG_UNAVAILABLE)
1342 throw_error (NOT_AVAILABLE_ERROR, _("PC register is not available"));
1344 pc_val = gdbarch_addr_bits_remove (gdbarch, raw_val);
1347 internal_error (__FILE__, __LINE__,
1348 _("regcache_read_pc: Unable to find PC"));
1353 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
1355 struct gdbarch *gdbarch = get_regcache_arch (regcache);
1357 if (gdbarch_write_pc_p (gdbarch))
1358 gdbarch_write_pc (gdbarch, regcache, pc);
1359 else if (gdbarch_pc_regnum (gdbarch) >= 0)
1360 regcache_cooked_write_unsigned (regcache,
1361 gdbarch_pc_regnum (gdbarch), pc);
1363 internal_error (__FILE__, __LINE__,
1364 _("regcache_write_pc: Unable to update PC"));
1366 /* Writing the PC (for instance, from "load") invalidates the
1368 reinit_frame_cache ();
1372 regcache::debug_print_register (const char *func, int regno)
1374 struct gdbarch *gdbarch = arch ();
1376 fprintf_unfiltered (gdb_stdlog, "%s ", func);
1377 if (regno >= 0 && regno < gdbarch_num_regs (gdbarch)
1378 && gdbarch_register_name (gdbarch, regno) != NULL
1379 && gdbarch_register_name (gdbarch, regno)[0] != '\0')
1380 fprintf_unfiltered (gdb_stdlog, "(%s)",
1381 gdbarch_register_name (gdbarch, regno));
1383 fprintf_unfiltered (gdb_stdlog, "(%d)", regno);
1384 if (regno >= 0 && regno < gdbarch_num_regs (gdbarch))
1386 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
1387 int size = register_size (gdbarch, regno);
1388 gdb_byte *buf = register_buffer (regno);
1390 fprintf_unfiltered (gdb_stdlog, " = ");
1391 for (int i = 0; i < size; i++)
1393 fprintf_unfiltered (gdb_stdlog, "%02x", buf[i]);
1395 if (size <= sizeof (LONGEST))
1397 ULONGEST val = extract_unsigned_integer (buf, size, byte_order);
1399 fprintf_unfiltered (gdb_stdlog, " %s %s",
1400 core_addr_to_string_nz (val), plongest (val));
1403 fprintf_unfiltered (gdb_stdlog, "\n");
1407 reg_flush_command (char *command, int from_tty)
1409 /* Force-flush the register cache. */
1410 registers_changed ();
1412 printf_filtered (_("Register cache flushed.\n"));
1416 regcache::dump (ui_file *file, enum regcache_dump_what what_to_dump)
1418 struct cleanup *cleanups = make_cleanup (null_cleanup, NULL);
1419 struct gdbarch *gdbarch = m_descr->gdbarch;
1421 int footnote_nr = 0;
1422 int footnote_register_size = 0;
1423 int footnote_register_offset = 0;
1424 int footnote_register_type_name_null = 0;
1425 long register_offset = 0;
1426 gdb_byte buf[MAX_REGISTER_SIZE];
1429 fprintf_unfiltered (file, "nr_raw_registers %d\n",
1430 m_descr->nr_raw_registers);
1431 fprintf_unfiltered (file, "nr_cooked_registers %d\n",
1432 m_descr->nr_cooked_registers);
1433 fprintf_unfiltered (file, "sizeof_raw_registers %ld\n",
1434 m_descr->sizeof_raw_registers);
1435 fprintf_unfiltered (file, "sizeof_raw_register_status %ld\n",
1436 m_descr->sizeof_raw_register_status);
1437 fprintf_unfiltered (file, "gdbarch_num_regs %d\n",
1438 gdbarch_num_regs (gdbarch));
1439 fprintf_unfiltered (file, "gdbarch_num_pseudo_regs %d\n",
1440 gdbarch_num_pseudo_regs (gdbarch));
1443 gdb_assert (m_descr->nr_cooked_registers
1444 == (gdbarch_num_regs (gdbarch)
1445 + gdbarch_num_pseudo_regs (gdbarch)));
1447 for (regnum = -1; regnum < m_descr->nr_cooked_registers; regnum++)
1451 fprintf_unfiltered (file, " %-10s", "Name");
1454 const char *p = gdbarch_register_name (gdbarch, regnum);
1458 else if (p[0] == '\0')
1460 fprintf_unfiltered (file, " %-10s", p);
1465 fprintf_unfiltered (file, " %4s", "Nr");
1467 fprintf_unfiltered (file, " %4d", regnum);
1469 /* Relative number. */
1471 fprintf_unfiltered (file, " %4s", "Rel");
1472 else if (regnum < gdbarch_num_regs (gdbarch))
1473 fprintf_unfiltered (file, " %4d", regnum);
1475 fprintf_unfiltered (file, " %4d",
1476 (regnum - gdbarch_num_regs (gdbarch)));
1480 fprintf_unfiltered (file, " %6s ", "Offset");
1483 fprintf_unfiltered (file, " %6ld",
1484 m_descr->register_offset[regnum]);
1485 if (register_offset != m_descr->register_offset[regnum]
1487 && (m_descr->register_offset[regnum]
1488 != (m_descr->register_offset[regnum - 1]
1489 + m_descr->sizeof_register[regnum - 1])))
1492 if (!footnote_register_offset)
1493 footnote_register_offset = ++footnote_nr;
1494 fprintf_unfiltered (file, "*%d", footnote_register_offset);
1497 fprintf_unfiltered (file, " ");
1498 register_offset = (m_descr->register_offset[regnum]
1499 + m_descr->sizeof_register[regnum]);
1504 fprintf_unfiltered (file, " %5s ", "Size");
1506 fprintf_unfiltered (file, " %5ld", m_descr->sizeof_register[regnum]);
1516 static const char blt[] = "builtin_type";
1518 t = TYPE_NAME (register_type (arch (), regnum));
1523 if (!footnote_register_type_name_null)
1524 footnote_register_type_name_null = ++footnote_nr;
1525 n = xstrprintf ("*%d", footnote_register_type_name_null);
1526 make_cleanup (xfree, n);
1529 /* Chop a leading builtin_type. */
1530 if (startswith (t, blt))
1533 fprintf_unfiltered (file, " %-15s", t);
1536 /* Leading space always present. */
1537 fprintf_unfiltered (file, " ");
1540 if (what_to_dump == regcache_dump_raw)
1543 fprintf_unfiltered (file, "Raw value");
1544 else if (regnum >= m_descr->nr_raw_registers)
1545 fprintf_unfiltered (file, "<cooked>");
1546 else if (get_register_status (regnum) == REG_UNKNOWN)
1547 fprintf_unfiltered (file, "<invalid>");
1548 else if (get_register_status (regnum) == REG_UNAVAILABLE)
1549 fprintf_unfiltered (file, "<unavailable>");
1552 raw_read (regnum, buf);
1553 print_hex_chars (file, buf,
1554 m_descr->sizeof_register[regnum],
1555 gdbarch_byte_order (gdbarch));
1559 /* Value, cooked. */
1560 if (what_to_dump == regcache_dump_cooked)
1563 fprintf_unfiltered (file, "Cooked value");
1566 enum register_status status;
1568 status = cooked_read (regnum, buf);
1569 if (status == REG_UNKNOWN)
1570 fprintf_unfiltered (file, "<invalid>");
1571 else if (status == REG_UNAVAILABLE)
1572 fprintf_unfiltered (file, "<unavailable>");
1574 print_hex_chars (file, buf,
1575 m_descr->sizeof_register[regnum],
1576 gdbarch_byte_order (gdbarch));
1580 /* Group members. */
1581 if (what_to_dump == regcache_dump_groups)
1584 fprintf_unfiltered (file, "Groups");
1587 const char *sep = "";
1588 struct reggroup *group;
1590 for (group = reggroup_next (gdbarch, NULL);
1592 group = reggroup_next (gdbarch, group))
1594 if (gdbarch_register_reggroup_p (gdbarch, regnum, group))
1596 fprintf_unfiltered (file,
1597 "%s%s", sep, reggroup_name (group));
1604 /* Remote packet configuration. */
1605 if (what_to_dump == regcache_dump_remote)
1609 fprintf_unfiltered (file, "Rmt Nr g/G Offset");
1611 else if (regnum < m_descr->nr_raw_registers)
1615 if (remote_register_number_and_offset (arch (), regnum,
1617 fprintf_unfiltered (file, "%7d %11d", pnum, poffset);
1621 fprintf_unfiltered (file, "\n");
1624 if (footnote_register_size)
1625 fprintf_unfiltered (file, "*%d: Inconsistent register sizes.\n",
1626 footnote_register_size);
1627 if (footnote_register_offset)
1628 fprintf_unfiltered (file, "*%d: Inconsistent register offsets.\n",
1629 footnote_register_offset);
1630 if (footnote_register_type_name_null)
1631 fprintf_unfiltered (file,
1632 "*%d: Register type's name NULL.\n",
1633 footnote_register_type_name_null);
1634 do_cleanups (cleanups);
1638 regcache_print (char *args, enum regcache_dump_what what_to_dump)
1641 get_current_regcache ()->dump (gdb_stdout, what_to_dump);
1646 if (!file.open (args, "w"))
1647 perror_with_name (_("maintenance print architecture"));
1648 get_current_regcache ()->dump (&file, what_to_dump);
1653 maintenance_print_registers (char *args, int from_tty)
1655 regcache_print (args, regcache_dump_none);
1659 maintenance_print_raw_registers (char *args, int from_tty)
1661 regcache_print (args, regcache_dump_raw);
1665 maintenance_print_cooked_registers (char *args, int from_tty)
1667 regcache_print (args, regcache_dump_cooked);
1671 maintenance_print_register_groups (char *args, int from_tty)
1673 regcache_print (args, regcache_dump_groups);
1677 maintenance_print_remote_registers (char *args, int from_tty)
1679 regcache_print (args, regcache_dump_remote);
1682 extern initialize_file_ftype _initialize_regcache; /* -Wmissing-prototype */
1685 _initialize_regcache (void)
1687 regcache_descr_handle
1688 = gdbarch_data_register_post_init (init_regcache_descr);
1690 observer_attach_target_changed (regcache_observer_target_changed);
1691 observer_attach_thread_ptid_changed (regcache_thread_ptid_changed);
1693 add_com ("flushregs", class_maintenance, reg_flush_command,
1694 _("Force gdb to flush its register cache (maintainer command)"));
1696 add_cmd ("registers", class_maintenance, maintenance_print_registers,
1697 _("Print the internal register configuration.\n"
1698 "Takes an optional file parameter."), &maintenanceprintlist);
1699 add_cmd ("raw-registers", class_maintenance,
1700 maintenance_print_raw_registers,
1701 _("Print the internal register configuration "
1702 "including raw values.\n"
1703 "Takes an optional file parameter."), &maintenanceprintlist);
1704 add_cmd ("cooked-registers", class_maintenance,
1705 maintenance_print_cooked_registers,
1706 _("Print the internal register configuration "
1707 "including cooked values.\n"
1708 "Takes an optional file parameter."), &maintenanceprintlist);
1709 add_cmd ("register-groups", class_maintenance,
1710 maintenance_print_register_groups,
1711 _("Print the internal register configuration "
1712 "including each register's group.\n"
1713 "Takes an optional file parameter."),
1714 &maintenanceprintlist);
1715 add_cmd ("remote-registers", class_maintenance,
1716 maintenance_print_remote_registers, _("\
1717 Print the internal register configuration including each register's\n\
1718 remote register number and buffer offset in the g/G packets.\n\
1719 Takes an optional file parameter."),
1720 &maintenanceprintlist);