1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001-2014 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 = (struct 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 fetch_inferior_registers (regcache, -1);
56 current_thread = saved_thread;
57 regcache->registers_valid = 1;
63 /* See common/common-regcache.h. */
66 get_thread_regcache_for_ptid (ptid_t ptid)
68 return get_thread_regcache (find_thread_ptid (ptid), 1);
72 regcache_invalidate_thread (struct thread_info *thread)
74 struct regcache *regcache;
76 regcache = (struct regcache *) inferior_regcache_data (thread);
81 if (regcache->registers_valid)
83 struct thread_info *saved_thread = current_thread;
85 current_thread = thread;
86 store_inferior_registers (regcache, -1);
87 current_thread = saved_thread;
90 regcache->registers_valid = 0;
94 regcache_invalidate_one (struct inferior_list_entry *entry,
97 struct thread_info *thread = (struct thread_info *) entry;
98 int pid = *(int *) pid_p;
100 /* Only invalidate the regcaches of threads of this process. */
101 if (ptid_get_pid (entry->id) == pid)
102 regcache_invalidate_thread (thread);
108 regcache_invalidate (void)
110 /* Only update the threads of the current process. */
111 int pid = ptid_get_pid (current_thread->entry.id);
113 find_inferior (&all_threads, regcache_invalidate_one, &pid);
119 init_register_cache (struct regcache *regcache,
120 const struct target_desc *tdesc,
121 unsigned char *regbuf)
125 #ifndef IN_PROCESS_AGENT
126 /* Make sure to zero-initialize the register cache when it is
127 created, in case there are registers the target never
128 fetches. This way they'll read as zero instead of
130 regcache->tdesc = tdesc;
131 regcache->registers = xcalloc (1, tdesc->registers_size);
132 regcache->registers_owned = 1;
133 regcache->register_status = xcalloc (1, tdesc->num_registers);
134 gdb_assert (REG_UNAVAILABLE == 0);
136 gdb_assert_not_reached ("can't allocate memory from the heap");
141 regcache->tdesc = tdesc;
142 regcache->registers = regbuf;
143 regcache->registers_owned = 0;
144 #ifndef IN_PROCESS_AGENT
145 regcache->register_status = NULL;
149 regcache->registers_valid = 0;
154 #ifndef IN_PROCESS_AGENT
157 new_register_cache (const struct target_desc *tdesc)
159 struct regcache *regcache;
161 gdb_assert (tdesc->registers_size != 0);
163 regcache = xmalloc (sizeof (*regcache));
164 return init_register_cache (regcache, tdesc, NULL);
168 free_register_cache (struct regcache *regcache)
172 if (regcache->registers_owned)
173 free (regcache->registers);
174 free (regcache->register_status);
182 regcache_cpy (struct regcache *dst, struct regcache *src)
184 gdb_assert (src != NULL && dst != NULL);
185 gdb_assert (src->tdesc == dst->tdesc);
186 gdb_assert (src != dst);
188 memcpy (dst->registers, src->registers, src->tdesc->registers_size);
189 #ifndef IN_PROCESS_AGENT
190 if (dst->register_status != NULL && src->register_status != NULL)
191 memcpy (dst->register_status, src->register_status,
192 src->tdesc->num_registers);
194 dst->registers_valid = src->registers_valid;
198 #ifndef IN_PROCESS_AGENT
201 registers_to_string (struct regcache *regcache, char *buf)
203 unsigned char *registers = regcache->registers;
204 const struct target_desc *tdesc = regcache->tdesc;
207 for (i = 0; i < tdesc->num_registers; i++)
209 if (regcache->register_status[i] == REG_VALID)
211 bin2hex (registers, buf, register_size (tdesc, i));
212 buf += register_size (tdesc, i) * 2;
216 memset (buf, 'x', register_size (tdesc, i) * 2);
217 buf += register_size (tdesc, i) * 2;
219 registers += register_size (tdesc, i);
225 registers_from_string (struct regcache *regcache, char *buf)
227 int len = strlen (buf);
228 unsigned char *registers = regcache->registers;
229 const struct target_desc *tdesc = regcache->tdesc;
231 if (len != tdesc->registers_size * 2)
233 warning ("Wrong sized register packet (expected %d bytes, got %d)",
234 2 * tdesc->registers_size, len);
235 if (len > tdesc->registers_size * 2)
236 len = tdesc->registers_size * 2;
238 hex2bin (buf, registers, len / 2);
242 find_register_by_name (const struct target_desc *tdesc, const char *name)
246 for (i = 0; i < tdesc->num_registers; i++)
247 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
248 return &tdesc->reg_defs[i];
249 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
254 find_regno (const struct target_desc *tdesc, const char *name)
258 for (i = 0; i < tdesc->num_registers; i++)
259 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
261 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
266 find_register_by_number (const struct target_desc *tdesc, int n)
268 return &tdesc->reg_defs[n];
273 #ifndef IN_PROCESS_AGENT
275 free_register_cache_thread (struct thread_info *thread)
277 struct regcache *regcache
278 = (struct regcache *) inferior_regcache_data (thread);
280 if (regcache != NULL)
282 regcache_invalidate_thread (thread);
283 free_register_cache (regcache);
284 set_inferior_regcache_data (thread, NULL);
289 free_register_cache_thread_one (struct inferior_list_entry *entry)
291 struct thread_info *thread = (struct thread_info *) entry;
293 free_register_cache_thread (thread);
297 regcache_release (void)
299 /* Flush and release all pre-existing register caches. */
300 for_each_inferior (&all_threads, free_register_cache_thread_one);
305 register_cache_size (const struct target_desc *tdesc)
307 return tdesc->registers_size;
311 register_size (const struct target_desc *tdesc, int n)
313 return tdesc->reg_defs[n].size / 8;
316 static unsigned char *
317 register_data (struct regcache *regcache, int n, int fetch)
319 return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
322 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
323 If BUF is NULL, the register's value is recorded as
327 supply_register (struct regcache *regcache, int n, const void *buf)
331 memcpy (register_data (regcache, n, 0), buf,
332 register_size (regcache->tdesc, n));
333 #ifndef IN_PROCESS_AGENT
334 if (regcache->register_status != NULL)
335 regcache->register_status[n] = REG_VALID;
340 memset (register_data (regcache, n, 0), 0,
341 register_size (regcache->tdesc, n));
342 #ifndef IN_PROCESS_AGENT
343 if (regcache->register_status != NULL)
344 regcache->register_status[n] = REG_UNAVAILABLE;
349 /* Supply register N with value zero to REGCACHE. */
352 supply_register_zeroed (struct regcache *regcache, int n)
354 memset (register_data (regcache, n, 0), 0,
355 register_size (regcache->tdesc, n));
356 #ifndef IN_PROCESS_AGENT
357 if (regcache->register_status != NULL)
358 regcache->register_status[n] = REG_VALID;
362 /* Supply the whole register set whose contents are stored in BUF, to
363 REGCACHE. If BUF is NULL, all the registers' values are recorded
367 supply_regblock (struct regcache *regcache, const void *buf)
371 const struct target_desc *tdesc = regcache->tdesc;
373 memcpy (regcache->registers, buf, tdesc->registers_size);
374 #ifndef IN_PROCESS_AGENT
378 for (i = 0; i < tdesc->num_registers; i++)
379 regcache->register_status[i] = REG_VALID;
385 const struct target_desc *tdesc = regcache->tdesc;
387 memset (regcache->registers, 0, tdesc->registers_size);
388 #ifndef IN_PROCESS_AGENT
392 for (i = 0; i < tdesc->num_registers; i++)
393 regcache->register_status[i] = REG_UNAVAILABLE;
399 #ifndef IN_PROCESS_AGENT
402 supply_register_by_name (struct regcache *regcache,
403 const char *name, const void *buf)
405 supply_register (regcache, find_regno (regcache->tdesc, name), buf);
411 collect_register (struct regcache *regcache, int n, void *buf)
413 memcpy (buf, register_data (regcache, n, 1),
414 register_size (regcache->tdesc, n));
417 #ifndef IN_PROCESS_AGENT
420 collect_register_as_string (struct regcache *regcache, int n, char *buf)
422 bin2hex (register_data (regcache, n, 1), buf,
423 register_size (regcache->tdesc, n));
427 collect_register_by_name (struct regcache *regcache,
428 const char *name, void *buf)
430 collect_register (regcache, find_regno (regcache->tdesc, name), buf);
433 /* Special handling for register PC. */
436 regcache_read_pc (struct regcache *regcache)
440 if (the_target->read_pc)
441 pc_val = the_target->read_pc (regcache);
443 internal_error (__FILE__, __LINE__,
444 "regcache_read_pc: Unable to find PC");
450 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
452 if (the_target->write_pc)
453 the_target->write_pc (regcache, pc);
455 internal_error (__FILE__, __LINE__,
456 "regcache_write_pc: Unable to update PC");