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1 /* Cache and manage the values of registers for GDB, the GNU debugger.
2
3 Copyright (C) 1986-2018 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
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.
11
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.
16
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/>. */
19
20 #ifndef REGCACHE_H
21 #define REGCACHE_H
22
23 #include "common-regcache.h"
24 #include <forward_list>
25
26 struct regcache;
27 struct regset;
28 struct gdbarch;
29 struct address_space;
30
31 extern struct regcache *get_current_regcache (void);
32 extern struct regcache *get_thread_regcache (ptid_t ptid);
33 extern struct regcache *get_thread_arch_regcache (ptid_t, struct gdbarch *);
34 extern struct regcache *get_thread_arch_aspace_regcache (ptid_t,
35 struct gdbarch *,
36 struct address_space *);
37
38 /* Return REGCACHE's ptid. */
39
40 extern ptid_t regcache_get_ptid (const struct regcache *regcache);
41
42 enum register_status regcache_register_status (const struct regcache *regcache,
43 int regnum);
44
45 /* Make certain that the register REGNUM in REGCACHE is up-to-date. */
46
47 void regcache_raw_update (struct regcache *regcache, int regnum);
48
49 /* Transfer a raw register [0..NUM_REGS) between core-gdb and the
50 regcache. The read variants return the status of the register. */
51
52 enum register_status regcache_raw_read (struct regcache *regcache,
53 int rawnum, gdb_byte *buf);
54 void regcache_raw_write (struct regcache *regcache, int rawnum,
55 const gdb_byte *buf);
56 extern enum register_status
57 regcache_raw_read_signed (struct regcache *regcache,
58 int regnum, LONGEST *val);
59
60 extern void regcache_raw_write_signed (struct regcache *regcache,
61 int regnum, LONGEST val);
62 extern void regcache_raw_write_unsigned (struct regcache *regcache,
63 int regnum, ULONGEST val);
64
65 /* Return the register's value in signed or throw if it's not
66 available. */
67
68 extern LONGEST regcache_raw_get_signed (struct regcache *regcache,
69 int regnum);
70
71 /* Set a raw register's value in the regcache's buffer. Unlike
72 regcache_raw_write, this is not write-through. The intention is
73 allowing to change the buffer contents of a read-only regcache
74 allocated with new. */
75
76 extern void regcache_raw_set_cached_value
77 (struct regcache *regcache, int regnum, const gdb_byte *buf);
78
79 /* Partial transfer of raw registers. These perform read, modify,
80 write style operations. The read variant returns the status of the
81 register. */
82
83 extern enum register_status
84 regcache_raw_read_part (struct regcache *regcache, int regnum,
85 int offset, int len, gdb_byte *buf);
86 void regcache_raw_write_part (struct regcache *regcache, int regnum,
87 int offset, int len, const gdb_byte *buf);
88
89 void regcache_invalidate (struct regcache *regcache, int regnum);
90
91 /* Transfer of pseudo-registers. The read variants return a register
92 status, as an indication of when a ``cooked'' register was
93 constructed from valid, invalid or unavailable ``raw''
94 registers. */
95
96 /* Transfer a cooked register [0..NUM_REGS+NUM_PSEUDO_REGS). */
97 enum register_status regcache_cooked_read (struct regcache *regcache,
98 int rawnum, gdb_byte *buf);
99 void regcache_cooked_write (struct regcache *regcache, int rawnum,
100 const gdb_byte *buf);
101
102 /* Read register REGNUM from REGCACHE and return a new value. This
103 will call mark_value_bytes_unavailable as appropriate. */
104
105 struct value *regcache_cooked_read_value (struct regcache *regcache,
106 int regnum);
107
108 /* Read a register as a signed/unsigned quantity. */
109 extern enum register_status
110 regcache_cooked_read_signed (struct regcache *regcache,
111 int regnum, LONGEST *val);
112 extern enum register_status
113 regcache_cooked_read_unsigned (struct regcache *regcache,
114 int regnum, ULONGEST *val);
115 extern void regcache_cooked_write_signed (struct regcache *regcache,
116 int regnum, LONGEST val);
117 extern void regcache_cooked_write_unsigned (struct regcache *regcache,
118 int regnum, ULONGEST val);
119
120 /* Partial transfer of a cooked register. These perform read, modify,
121 write style operations. */
122
123 enum register_status regcache_cooked_read_part (struct regcache *regcache,
124 int regnum, int offset,
125 int len, gdb_byte *buf);
126 void regcache_cooked_write_part (struct regcache *regcache, int regnum,
127 int offset, int len, const gdb_byte *buf);
128
129 /* Special routines to read/write the PC. */
130
131 /* For regcache_read_pc see common/common-regcache.h. */
132 extern void regcache_write_pc (struct regcache *regcache, CORE_ADDR pc);
133
134 /* Transfer a raw register [0..NUM_REGS) between the regcache and the
135 target. These functions are called by the target in response to a
136 target_fetch_registers() or target_store_registers(). */
137
138 extern void regcache_raw_supply (struct regcache *regcache,
139 int regnum, const void *buf);
140 extern void regcache_raw_collect (const struct regcache *regcache,
141 int regnum, void *buf);
142
143 /* Mapping between register numbers and offsets in a buffer, for use
144 in the '*regset' functions below. In an array of
145 'regcache_map_entry' each element is interpreted like follows:
146
147 - If 'regno' is a register number: Map register 'regno' to the
148 current offset (starting with 0) and increase the current offset
149 by 'size' (or the register's size, if 'size' is zero). Repeat
150 this with consecutive register numbers up to 'regno+count-1'.
151
152 - If 'regno' is REGCACHE_MAP_SKIP: Add 'count*size' to the current
153 offset.
154
155 - If count=0: End of the map. */
156
157 struct regcache_map_entry
158 {
159 int count;
160 int regno;
161 int size;
162 };
163
164 /* Special value for the 'regno' field in the struct above. */
165
166 enum
167 {
168 REGCACHE_MAP_SKIP = -1,
169 };
170
171 /* Transfer a set of registers (as described by REGSET) between
172 REGCACHE and BUF. If REGNUM == -1, transfer all registers
173 belonging to the regset, otherwise just the register numbered
174 REGNUM. The REGSET's 'regmap' field must point to an array of
175 'struct regcache_map_entry'.
176
177 These functions are suitable for the 'regset_supply' and
178 'regset_collect' fields in a regset structure. */
179
180 extern void regcache_supply_regset (const struct regset *regset,
181 struct regcache *regcache,
182 int regnum, const void *buf,
183 size_t size);
184 extern void regcache_collect_regset (const struct regset *regset,
185 const struct regcache *regcache,
186 int regnum, void *buf, size_t size);
187
188
189 /* The type of a register. This function is slightly more efficient
190 then its gdbarch vector counterpart since it returns a precomputed
191 value stored in a table. */
192
193 extern struct type *register_type (struct gdbarch *gdbarch, int regnum);
194
195
196 /* Return the size of register REGNUM. All registers should have only
197 one size. */
198
199 extern int register_size (struct gdbarch *gdbarch, int regnum);
200
201
202 /* Save/restore a register cache. The set of registers saved /
203 restored into the DST regcache determined by the save_reggroup /
204 restore_reggroup respectively. COOKED_READ returns zero iff the
205 register's value can't be returned. */
206
207 typedef enum register_status (regcache_cooked_read_ftype) (void *src,
208 int regnum,
209 gdb_byte *buf);
210
211 extern void regcache_save (struct regcache *dst,
212 regcache_cooked_read_ftype *cooked_read,
213 void *cooked_read_context);
214
215 enum regcache_dump_what
216 {
217 regcache_dump_none, regcache_dump_raw,
218 regcache_dump_cooked, regcache_dump_groups,
219 regcache_dump_remote
220 };
221
222 /* A (register_number, register_value) pair. */
223
224 typedef struct cached_reg
225 {
226 int num;
227 gdb_byte *data;
228 } cached_reg_t;
229
230 /* The register cache for storing raw register values. */
231
232 class regcache
233 {
234 public:
235 regcache (gdbarch *gdbarch)
236 : regcache (gdbarch, nullptr, true)
237 {}
238
239 struct readonly_t {};
240 static constexpr readonly_t readonly {};
241
242 /* Create a readonly regcache from a non-readonly regcache. */
243 regcache (readonly_t, const regcache &src);
244
245 DISABLE_COPY_AND_ASSIGN (regcache);
246
247 ~regcache ()
248 {
249 xfree (m_registers);
250 xfree (m_register_status);
251 }
252
253 /* Return regcache's architecture. */
254 gdbarch *arch () const;
255
256 /* Return REGCACHE's address space. */
257 const address_space *aspace () const
258 {
259 return m_aspace;
260 }
261
262 void save (regcache_cooked_read_ftype *cooked_read, void *src);
263
264 enum register_status cooked_read (int regnum, gdb_byte *buf);
265 void cooked_write (int regnum, const gdb_byte *buf);
266
267 enum register_status raw_read (int regnum, gdb_byte *buf);
268
269 void raw_write (int regnum, const gdb_byte *buf);
270
271 template<typename T, typename = RequireLongest<T>>
272 enum register_status raw_read (int regnum, T *val);
273
274 template<typename T, typename = RequireLongest<T>>
275 void raw_write (int regnum, T val);
276
277 struct value *cooked_read_value (int regnum);
278
279 template<typename T, typename = RequireLongest<T>>
280 enum register_status cooked_read (int regnum, T *val);
281
282 template<typename T, typename = RequireLongest<T>>
283 void cooked_write (int regnum, T val);
284
285 void raw_update (int regnum);
286
287 void raw_collect (int regnum, void *buf) const;
288
289 void raw_collect_integer (int regnum, gdb_byte *addr, int addr_len,
290 bool is_signed) const;
291
292 void raw_supply (int regnum, const void *buf);
293
294 void raw_supply_integer (int regnum, const gdb_byte *addr, int addr_len,
295 bool is_signed);
296
297 void raw_supply_zeroed (int regnum);
298
299 enum register_status get_register_status (int regnum) const;
300
301 void raw_set_cached_value (int regnum, const gdb_byte *buf);
302
303 void invalidate (int regnum);
304
305 enum register_status raw_read_part (int regnum, int offset, int len,
306 gdb_byte *buf);
307
308 void raw_write_part (int regnum, int offset, int len, const gdb_byte *buf);
309
310 enum register_status cooked_read_part (int regnum, int offset, int len,
311 gdb_byte *buf);
312
313 void cooked_write_part (int regnum, int offset, int len,
314 const gdb_byte *buf);
315
316 void supply_regset (const struct regset *regset,
317 int regnum, const void *buf, size_t size);
318
319
320 void collect_regset (const struct regset *regset, int regnum,
321 void *buf, size_t size) const;
322
323 void dump (ui_file *file, enum regcache_dump_what what_to_dump);
324
325 ptid_t ptid () const
326 {
327 return m_ptid;
328 }
329
330 void set_ptid (const ptid_t ptid)
331 {
332 this->m_ptid = ptid;
333 }
334
335 /* Dump the contents of a register from the register cache to the target
336 debug. */
337 void debug_print_register (const char *func, int regno);
338
339 static void regcache_thread_ptid_changed (ptid_t old_ptid, ptid_t new_ptid);
340 protected:
341 regcache (gdbarch *gdbarch, const address_space *aspace_, bool readonly_p_);
342
343 int num_raw_registers () const;
344
345 static std::forward_list<regcache *> current_regcache;
346
347 private:
348 gdb_byte *register_buffer (int regnum) const;
349
350 void restore (struct regcache *src);
351
352 enum register_status xfer_part (int regnum, int offset, int len, void *in,
353 const void *out, bool is_raw);
354
355 void transfer_regset (const struct regset *regset,
356 struct regcache *out_regcache,
357 int regnum, const void *in_buf,
358 void *out_buf, size_t size) const;
359
360 /* Assert on the range of REGNUM. */
361 void assert_regnum (int regnum) const;
362
363 struct regcache_descr *m_descr;
364
365 /* The address space of this register cache (for registers where it
366 makes sense, like PC or SP). */
367 const address_space * const m_aspace;
368
369 /* The register buffers. A read-only register cache can hold the
370 full [0 .. gdbarch_num_regs + gdbarch_num_pseudo_regs) while a read/write
371 register cache can only hold [0 .. gdbarch_num_regs). */
372 gdb_byte *m_registers;
373 /* Register cache status. */
374 signed char *m_register_status;
375 /* Is this a read-only cache? A read-only cache is used for saving
376 the target's register state (e.g, across an inferior function
377 call or just before forcing a function return). A read-only
378 cache can only be updated via the methods regcache_dup() and
379 regcache_cpy(). The actual contents are determined by the
380 reggroup_save and reggroup_restore methods. */
381 const bool m_readonly_p;
382 /* If this is a read-write cache, which thread's registers is
383 it connected to? */
384 ptid_t m_ptid;
385
386 friend struct regcache *
387 get_thread_arch_aspace_regcache (ptid_t ptid, struct gdbarch *gdbarch,
388 struct address_space *aspace);
389
390 friend void
391 registers_changed_ptid (ptid_t ptid);
392
393 friend void
394 regcache_cpy (struct regcache *dst, struct regcache *src);
395 };
396
397 /* Duplicate the contents of a register cache to a read-only register
398 cache. The operation is pass-through. */
399 extern struct regcache *regcache_dup (struct regcache *regcache);
400
401 /* Writes to DEST will go through to the target. SRC is a read-only
402 register cache. */
403 extern void regcache_cpy (struct regcache *dest, struct regcache *src);
404
405 extern void registers_changed (void);
406 extern void registers_changed_ptid (ptid_t);
407
408 #endif /* REGCACHE_H */
gdbarch
Definition: gdbarch.c:127
regcache_raw_read
enum register_status regcache_raw_read(struct regcache *regcache, int rawnum, gdb_byte *buf)
Definition: regcache.c:565
regcache::cooked_read
enum register_status cooked_read(int regnum, gdb_byte *buf)
Definition: regcache.c:667
regcache::num_raw_registers
int num_raw_registers() const
Definition: regcache.c:1275
regcache_dump_what
regcache_dump_what
Definition: regcache.h:215
regcache::raw_read
enum register_status raw_read(int regnum, gdb_byte *buf)
Definition: regcache.c:571
regcache::m_aspace
const address_space *const m_aspace
Definition: regcache.h:367
CORE_ADDR
bfd_vma CORE_ADDR
Definition: common-types.h:41
regcache::cooked_write_part
void cooked_write_part(int regnum, int offset, int len, const gdb_byte *buf)
Definition: regcache.c:994
cached_reg::num
int num
Definition: regcache.h:226
regcache_raw_collect
void regcache_raw_collect(const struct regcache *regcache, int regnum, void *buf)
Definition: regcache.c:1085
xfree
void xfree(void *)
common-regcache.h
regcache_cooked_write
void regcache_cooked_write(struct regcache *regcache, int rawnum, const gdb_byte *buf)
Definition: regcache.c:873
regcache::cooked_read_value
struct value * cooked_read_value(int regnum)
Definition: regcache.c:720
regcache::regcache_thread_ptid_changed
static void regcache_thread_ptid_changed(ptid_t old_ptid, ptid_t new_ptid)
Definition: regcache.c:470
func
void(* func)(char *)
Definition: remote-fileio.c:1104
regcache::supply_regset
void supply_regset(const struct regset *regset, int regnum, const void *buf, size_t size)
Definition: regcache.c:1200
regcache::regcache
regcache(gdbarch *gdbarch)
Definition: regcache.h:235
get_current_regcache
struct regcache * get_current_regcache(void)
Definition: regcache.c:446
regcache_dump_none
Definition: regcache.h:217
regcache_raw_update
void regcache_raw_update(struct regcache *regcache, int regnum)
Definition: regcache.c:535
regcache_dump_raw
Definition: regcache.h:217
regcache_cooked_write_unsigned
void regcache_cooked_write_unsigned(struct regcache *regcache, int regnum, ULONGEST val)
Definition: regcache.c:806
regcache::raw_write
void raw_write(int regnum, const gdb_byte *buf)
Definition: regcache.c:839
regcache_collect_regset
void regcache_collect_regset(const struct regset *regset, const struct regcache *regcache, int regnum, void *buf, size_t size)
Definition: regcache.c:1211
regcache::raw_read_part
enum register_status raw_read_part(int regnum, int offset, int len, gdb_byte *buf)
Definition: regcache.c:950
regcache_cooked_write_signed
void regcache_cooked_write_signed(struct regcache *regcache, int regnum, LONGEST val)
Definition: regcache.c:785
regcache::save
void save(regcache_cooked_read_ftype *cooked_read, void *src)
Definition: regcache.c:283
regcache::register_buffer
gdb_byte * register_buffer(int regnum) const
Definition: regcache.c:270
register_status
register_status
Definition: common-regcache.h:25
cached_reg_t
struct cached_reg cached_reg_t
regcache_cooked_read_unsigned
enum register_status regcache_cooked_read_unsigned(struct regcache *regcache, int regnum, ULONGEST *val)
Definition: regcache.c:777
regcache::assert_regnum
void assert_regnum(int regnum) const
Definition: regcache.c:393
ui_file
Definition: ui-file.h:26
get_thread_regcache
struct regcache * get_thread_regcache(ptid_t ptid)
Definition: regcache.c:434
regcache::set_ptid
void set_ptid(const ptid_t ptid)
Definition: regcache.h:330
regcache_map_entry::count
int count
Definition: regcache.h:159
regcache_cooked_read_value
struct value * regcache_cooked_read_value(struct regcache *regcache, int regnum)
Definition: regcache.c:714
regcache_save
void regcache_save(struct regcache *dst, regcache_cooked_read_ftype *cooked_read, void *cooked_read_context)
Definition: regcache.c:276
regcache_dump_cooked
Definition: regcache.h:218
regcache::readonly
static constexpr readonly_t readonly
Definition: regcache.h:240
regcache::raw_supply_integer
void raw_supply_integer(int regnum, const gdb_byte *addr, int addr_len, bool is_signed)
Definition: regcache.c:1044
regcache::readonly_t
Definition: regcache.h:239
regcache_raw_write_signed
void regcache_raw_write_signed(struct regcache *regcache, int regnum, LONGEST val)
Definition: regcache.c:620
regcache_cooked_read_signed
enum register_status regcache_cooked_read_signed(struct regcache *regcache, int regnum, LONGEST *val)
Definition: regcache.c:751
regcache::m_descr
struct regcache_descr * m_descr
Definition: regcache.h:363
register_type
struct type * register_type(struct gdbarch *gdbarch, int regnum)
Definition: regcache.c:152
regcache::m_readonly_p
const bool m_readonly_p
Definition: regcache.h:381
regcache::xfer_part
enum register_status xfer_part(int regnum, int offset, int len, void *in, const void *out, bool is_raw)
Definition: regcache.c:900
regset
Definition: regset.h:34
regcache::restore
void restore(struct regcache *src)
Definition: regcache.c:318
regcache_write_pc
void regcache_write_pc(struct regcache *regcache, CORE_ADDR pc)
Definition: regcache.c:1256
get_thread_arch_regcache
struct regcache * get_thread_arch_regcache(ptid_t, struct gdbarch *)
Definition: regcache.c:423
regcache::raw_collect
void raw_collect(int regnum, void *buf) const
Definition: regcache.c:1092
regcache_cooked_read_part
enum register_status regcache_cooked_read_part(struct regcache *regcache, int regnum, int offset, int len, gdb_byte *buf)
Definition: regcache.c:972
regcache_raw_read_signed
enum register_status regcache_raw_read_signed(struct regcache *regcache, int regnum, LONGEST *val)
Definition: regcache.c:586
regcache::raw_supply
void raw_supply(int regnum, const void *buf)
Definition: regcache.c:1011
regcache::raw_write_part
void raw_write_part(int regnum, int offset, int len, const gdb_byte *buf)
Definition: regcache.c:964
regcache_cooked_write_part
void regcache_cooked_write_part(struct regcache *regcache, int regnum, int offset, int len, const gdb_byte *buf)
Definition: regcache.c:987
ptid_t
Definition: ptid.h:35
regcache_raw_supply
void regcache_raw_supply(struct regcache *regcache, int regnum, const void *buf)
Definition: regcache.c:1004
regcache_map_entry::size
int size
Definition: regcache.h:161
regcache_raw_read_part
enum register_status regcache_raw_read_part(struct regcache *regcache, int regnum, int offset, int len, gdb_byte *buf)
Definition: regcache.c:943
register_size
int register_size(struct gdbarch *gdbarch, int regnum)
Definition: regcache.c:164
regcache_raw_write
void regcache_raw_write(struct regcache *regcache, int rawnum, const gdb_byte *buf)
Definition: regcache.c:831
regcache::transfer_regset
void transfer_regset(const struct regset *regset, struct regcache *out_regcache, int regnum, const void *in_buf, void *out_buf, size_t size) const
Definition: regcache.c:1133
regcache::raw_collect_integer
void raw_collect_integer(int regnum, gdb_byte *addr, int addr_len, bool is_signed) const
Definition: regcache.c:1116
type
Definition: gdbtypes.h:749
regcache_descr
Definition: regcache.c:44
regcache::raw_set_cached_value
void raw_set_cached_value(int regnum, const gdb_byte *buf)
Definition: regcache.c:823
regcache::~regcache
~regcache()
Definition: regcache.h:247
regcache_raw_set_cached_value
void regcache_raw_set_cached_value(struct regcache *regcache, int regnum, const gdb_byte *buf)
Definition: regcache.c:816
regcache::raw_supply_zeroed
void raw_supply_zeroed(int regnum)
Definition: regcache.c:1067
cached_reg
Definition: regcache.h:224
regcache_invalidate
void regcache_invalidate(struct regcache *regcache, int regnum)
Definition: regcache.c:378
regcache_dump_remote
Definition: regcache.h:219
regnum
int regnum
Definition: aarch64-tdep.c:77
regcache::regcache_cpy
friend void regcache_cpy(struct regcache *dst, struct regcache *src)
Definition: regcache.c:342
regcache::collect_regset
void collect_regset(const struct regset *regset, int regnum, void *buf, size_t size) const
Definition: regcache.c:1219
regcache::aspace
const address_space * aspace() const
Definition: regcache.h:257
registers_changed
void registers_changed(void)
Definition: regcache.c:522
regcache_register_status
enum register_status regcache_register_status(const struct regcache *regcache, int regnum)
Definition: regcache.c:359
regcache::current_regcache
static std::forward_list< regcache * > current_regcache
Definition: regcache.h:345
value
Definition: value.c:169
regcache::registers_changed_ptid
friend void registers_changed_ptid(ptid_t ptid)
Definition: regcache.c:491
regcache_raw_write_part
void regcache_raw_write_part(struct regcache *regcache, int regnum, int offset, int len, const gdb_byte *buf)
Definition: regcache.c:957
regcache::get_thread_arch_aspace_regcache
friend struct regcache * get_thread_arch_aspace_regcache(ptid_t ptid, struct gdbarch *gdbarch, struct address_space *aspace)
Definition: regcache.c:407
regcache::get_register_status
enum register_status get_register_status(int regnum) const
Definition: regcache.c:366
regcache_raw_get_signed
LONGEST regcache_raw_get_signed(struct regcache *regcache, int regnum)
Definition: regcache.c:648
REGCACHE_MAP_SKIP
Definition: regcache.h:168
gdb_byte
bfd_byte gdb_byte
Definition: common-types.h:38
registers_changed_ptid
void registers_changed_ptid(ptid_t)
Definition: regcache.c:491
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Definition: regcache.c:342
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Definition: progspace.h:216
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Definition: regcache.c:407
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Definition: regcache.c:1281
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Definition: regcache.c:353
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Definition: regcache.h:218
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Definition: agent.c:65
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Definition: regcache.c:980
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Definition: regcache.h:372
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Definition: regcache.c:221
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Definition: regcache.c:880
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Definition: regcache.c:1325
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Definition: regcache.c:640
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Definition: common-types.h:53
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Definition: regcache.c:661
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Definition: regcache.h:232
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Definition: regcache.h:160
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Definition: regcache.h:227
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Definition: regcache.c:543
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Definition: regcache.h:384
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Definition: regcache.h:325
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Definition: regcache.c:1192
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Definition: regcache.h:374
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Definition: regcache.c:385
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Definition: go32-nat.c:242
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Definition: common-types.h:52
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Definition: regcache.h:157
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Definition: regcache.c:229