1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "gdbthread.h"
24 #ifndef IN_PROCESS_AGENT
27 get_thread_regcache (struct thread_info *thread, int fetch)
29 struct regcache *regcache;
31 regcache = inferior_regcache_data (thread);
33 /* Threads' regcaches are created lazily, because biarch targets add
34 the main thread/lwp before seeing it stop for the first time, and
35 it is only after the target sees the thread stop for the first
36 time that the target has a chance of determining the process's
37 architecture. IOW, when we first add the process's main thread
38 we don't know which architecture/tdesc its regcache should
42 struct process_info *proc = get_thread_process (thread);
44 gdb_assert (proc->tdesc != NULL);
46 regcache = new_register_cache (proc->tdesc);
47 set_inferior_regcache_data (thread, regcache);
50 if (fetch && regcache->registers_valid == 0)
52 struct thread_info *saved_thread = current_thread;
54 current_thread = thread;
55 /* Invalidate all registers, to prevent stale left-overs. */
56 memset (regcache->register_status, REG_UNAVAILABLE,
57 regcache->tdesc->num_registers);
58 fetch_inferior_registers (regcache, -1);
59 current_thread = saved_thread;
60 regcache->registers_valid = 1;
66 /* See common/common-regcache.h. */
69 get_thread_regcache_for_ptid (ptid_t ptid)
71 return get_thread_regcache (find_thread_ptid (ptid), 1);
75 regcache_invalidate_thread (struct thread_info *thread)
77 struct regcache *regcache;
79 regcache = inferior_regcache_data (thread);
84 if (regcache->registers_valid)
86 struct thread_info *saved_thread = current_thread;
88 current_thread = thread;
89 store_inferior_registers (regcache, -1);
90 current_thread = saved_thread;
93 regcache->registers_valid = 0;
97 regcache_invalidate_one (struct inferior_list_entry *entry,
100 struct thread_info *thread = (struct thread_info *) entry;
101 int pid = *(int *) pid_p;
103 /* Only invalidate the regcaches of threads of this process. */
104 if (ptid_get_pid (entry->id) == pid)
105 regcache_invalidate_thread (thread);
110 /* See regcache.h. */
113 regcache_invalidate_pid (int pid)
115 find_inferior (&all_threads, regcache_invalidate_one, &pid);
118 /* See regcache.h. */
121 regcache_invalidate (void)
123 /* Only update the threads of the current process. */
124 int pid = ptid_get_pid (current_thread->entry.id);
126 regcache_invalidate_pid (pid);
132 init_register_cache (struct regcache *regcache,
133 const struct target_desc *tdesc,
134 unsigned char *regbuf)
138 #ifndef IN_PROCESS_AGENT
139 /* Make sure to zero-initialize the register cache when it is
140 created, in case there are registers the target never
141 fetches. This way they'll read as zero instead of
143 regcache->tdesc = tdesc;
145 = (unsigned char *) xcalloc (1, tdesc->registers_size);
146 regcache->registers_owned = 1;
147 regcache->register_status
148 = (unsigned char *) xmalloc (tdesc->num_registers);
149 memset ((void *) regcache->register_status, REG_UNAVAILABLE,
150 tdesc->num_registers);
152 gdb_assert_not_reached ("can't allocate memory from the heap");
157 regcache->tdesc = tdesc;
158 regcache->registers = regbuf;
159 regcache->registers_owned = 0;
160 #ifndef IN_PROCESS_AGENT
161 regcache->register_status = NULL;
165 regcache->registers_valid = 0;
170 #ifndef IN_PROCESS_AGENT
173 new_register_cache (const struct target_desc *tdesc)
175 struct regcache *regcache = XCNEW (struct regcache);
177 gdb_assert (tdesc->registers_size != 0);
179 return init_register_cache (regcache, tdesc, NULL);
183 free_register_cache (struct regcache *regcache)
187 if (regcache->registers_owned)
188 free (regcache->registers);
189 free (regcache->register_status);
197 regcache_cpy (struct regcache *dst, struct regcache *src)
199 gdb_assert (src != NULL && dst != NULL);
200 gdb_assert (src->tdesc == dst->tdesc);
201 gdb_assert (src != dst);
203 memcpy (dst->registers, src->registers, src->tdesc->registers_size);
204 #ifndef IN_PROCESS_AGENT
205 if (dst->register_status != NULL && src->register_status != NULL)
206 memcpy (dst->register_status, src->register_status,
207 src->tdesc->num_registers);
209 dst->registers_valid = src->registers_valid;
213 #ifndef IN_PROCESS_AGENT
216 registers_to_string (struct regcache *regcache, char *buf)
218 unsigned char *registers = regcache->registers;
219 const struct target_desc *tdesc = regcache->tdesc;
222 for (i = 0; i < tdesc->num_registers; i++)
224 if (regcache->register_status[i] == REG_VALID)
226 bin2hex (registers, buf, register_size (tdesc, i));
227 buf += register_size (tdesc, i) * 2;
231 memset (buf, 'x', register_size (tdesc, i) * 2);
232 buf += register_size (tdesc, i) * 2;
234 registers += register_size (tdesc, i);
240 registers_from_string (struct regcache *regcache, char *buf)
242 int len = strlen (buf);
243 unsigned char *registers = regcache->registers;
244 const struct target_desc *tdesc = regcache->tdesc;
246 if (len != tdesc->registers_size * 2)
248 warning ("Wrong sized register packet (expected %d bytes, got %d)",
249 2 * tdesc->registers_size, len);
250 if (len > tdesc->registers_size * 2)
251 len = tdesc->registers_size * 2;
253 hex2bin (buf, registers, len / 2);
257 find_register_by_name (const struct target_desc *tdesc, const char *name)
261 for (i = 0; i < tdesc->num_registers; i++)
262 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
263 return &tdesc->reg_defs[i];
264 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
269 find_regno (const struct target_desc *tdesc, const char *name)
273 for (i = 0; i < tdesc->num_registers; i++)
274 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
276 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
281 find_register_by_number (const struct target_desc *tdesc, int n)
283 return &tdesc->reg_defs[n];
288 #ifndef IN_PROCESS_AGENT
290 free_register_cache_thread (struct thread_info *thread)
292 struct regcache *regcache = inferior_regcache_data (thread);
294 if (regcache != NULL)
296 regcache_invalidate_thread (thread);
297 free_register_cache (regcache);
298 set_inferior_regcache_data (thread, NULL);
303 free_register_cache_thread_one (struct inferior_list_entry *entry)
305 struct thread_info *thread = (struct thread_info *) entry;
307 free_register_cache_thread (thread);
311 regcache_release (void)
313 /* Flush and release all pre-existing register caches. */
314 for_each_inferior (&all_threads, free_register_cache_thread_one);
319 register_cache_size (const struct target_desc *tdesc)
321 return tdesc->registers_size;
325 register_size (const struct target_desc *tdesc, int n)
327 return tdesc->reg_defs[n].size / 8;
330 /* See common/common-regcache.h. */
333 regcache_register_size (const struct regcache *regcache, int n)
335 return register_size (regcache->tdesc, n);
338 static unsigned char *
339 register_data (struct regcache *regcache, int n, int fetch)
341 return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
344 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
345 If BUF is NULL, the register's value is recorded as
349 supply_register (struct regcache *regcache, int n, const void *buf)
353 memcpy (register_data (regcache, n, 0), buf,
354 register_size (regcache->tdesc, n));
355 #ifndef IN_PROCESS_AGENT
356 if (regcache->register_status != NULL)
357 regcache->register_status[n] = REG_VALID;
362 memset (register_data (regcache, n, 0), 0,
363 register_size (regcache->tdesc, n));
364 #ifndef IN_PROCESS_AGENT
365 if (regcache->register_status != NULL)
366 regcache->register_status[n] = REG_UNAVAILABLE;
371 /* Supply register N with value zero to REGCACHE. */
374 supply_register_zeroed (struct regcache *regcache, int n)
376 memset (register_data (regcache, n, 0), 0,
377 register_size (regcache->tdesc, n));
378 #ifndef IN_PROCESS_AGENT
379 if (regcache->register_status != NULL)
380 regcache->register_status[n] = REG_VALID;
384 /* Supply the whole register set whose contents are stored in BUF, to
385 REGCACHE. If BUF is NULL, all the registers' values are recorded
389 supply_regblock (struct regcache *regcache, const void *buf)
393 const struct target_desc *tdesc = regcache->tdesc;
395 memcpy (regcache->registers, buf, tdesc->registers_size);
396 #ifndef IN_PROCESS_AGENT
400 for (i = 0; i < tdesc->num_registers; i++)
401 regcache->register_status[i] = REG_VALID;
407 const struct target_desc *tdesc = regcache->tdesc;
409 memset (regcache->registers, 0, tdesc->registers_size);
410 #ifndef IN_PROCESS_AGENT
414 for (i = 0; i < tdesc->num_registers; i++)
415 regcache->register_status[i] = REG_UNAVAILABLE;
421 #ifndef IN_PROCESS_AGENT
424 supply_register_by_name (struct regcache *regcache,
425 const char *name, const void *buf)
427 supply_register (regcache, find_regno (regcache->tdesc, name), buf);
433 collect_register (struct regcache *regcache, int n, void *buf)
435 memcpy (buf, register_data (regcache, n, 1),
436 register_size (regcache->tdesc, n));
440 regcache_raw_read_unsigned (struct regcache *regcache, int regnum,
445 gdb_assert (regcache != NULL);
446 gdb_assert (regnum >= 0 && regnum < regcache->tdesc->num_registers);
448 size = register_size (regcache->tdesc, regnum);
450 if (size > (int) sizeof (ULONGEST))
451 error (_("That operation is not available on integers of more than"
453 (int) sizeof (ULONGEST));
455 collect_register (regcache, regnum, val);
460 #ifndef IN_PROCESS_AGENT
463 collect_register_as_string (struct regcache *regcache, int n, char *buf)
465 bin2hex (register_data (regcache, n, 1), buf,
466 register_size (regcache->tdesc, n));
470 collect_register_by_name (struct regcache *regcache,
471 const char *name, void *buf)
473 collect_register (regcache, find_regno (regcache->tdesc, name), buf);
476 /* Special handling for register PC. */
479 regcache_read_pc (struct regcache *regcache)
483 if (the_target->read_pc)
484 pc_val = the_target->read_pc (regcache);
486 internal_error (__FILE__, __LINE__,
487 "regcache_read_pc: Unable to find PC");
493 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
495 if (the_target->write_pc)
496 the_target->write_pc (regcache, pc);
498 internal_error (__FILE__, __LINE__,
499 "regcache_write_pc: Unable to update PC");