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"
28 #ifndef IN_PROCESS_AGENT
31 get_thread_regcache (struct thread_info *thread, int fetch)
33 struct regcache *regcache;
35 regcache = (struct regcache *) inferior_regcache_data (thread);
37 /* Threads' regcaches are created lazily, because biarch targets add
38 the main thread/lwp before seeing it stop for the first time, and
39 it is only after the target sees the thread stop for the first
40 time that the target has a chance of determining the process's
41 architecture. IOW, when we first add the process's main thread
42 we don't know which architecture/tdesc its regcache should
46 struct process_info *proc = get_thread_process (thread);
48 if (proc->tdesc == NULL)
49 fatal ("no target description");
51 regcache = new_register_cache (proc->tdesc);
52 set_inferior_regcache_data (thread, regcache);
55 if (fetch && regcache->registers_valid == 0)
57 struct thread_info *saved_inferior = current_inferior;
59 current_inferior = thread;
60 fetch_inferior_registers (regcache, -1);
61 current_inferior = saved_inferior;
62 regcache->registers_valid = 1;
69 regcache_invalidate_thread (struct thread_info *thread)
71 struct regcache *regcache;
73 regcache = (struct regcache *) inferior_regcache_data (thread);
78 if (regcache->registers_valid)
80 struct thread_info *saved_inferior = current_inferior;
82 current_inferior = thread;
83 store_inferior_registers (regcache, -1);
84 current_inferior = saved_inferior;
87 regcache->registers_valid = 0;
91 regcache_invalidate_one (struct inferior_list_entry *entry,
94 struct thread_info *thread = (struct thread_info *) entry;
95 int pid = *(int *) pid_p;
97 /* Only invalidate the regcaches of threads of this process. */
98 if (ptid_get_pid (entry->id) == pid)
99 regcache_invalidate_thread (thread);
105 regcache_invalidate (void)
107 /* Only update the threads of the current process. */
108 int pid = ptid_get_pid (current_inferior->entry.id);
110 find_inferior (&all_threads, regcache_invalidate_one, &pid);
116 init_register_cache (struct regcache *regcache,
117 const struct target_desc *tdesc,
118 unsigned char *regbuf)
122 #ifndef IN_PROCESS_AGENT
123 /* Make sure to zero-initialize the register cache when it is
124 created, in case there are registers the target never
125 fetches. This way they'll read as zero instead of
127 regcache->tdesc = tdesc;
128 regcache->registers = xcalloc (1, tdesc->registers_size);
129 regcache->registers_owned = 1;
130 regcache->register_status = xcalloc (1, tdesc->num_registers);
131 gdb_assert (REG_UNAVAILABLE == 0);
133 fatal ("init_register_cache: can't allocate memory from the heap");
138 regcache->tdesc = tdesc;
139 regcache->registers = regbuf;
140 regcache->registers_owned = 0;
141 #ifndef IN_PROCESS_AGENT
142 regcache->register_status = NULL;
146 regcache->registers_valid = 0;
151 #ifndef IN_PROCESS_AGENT
154 new_register_cache (const struct target_desc *tdesc)
156 struct regcache *regcache;
158 gdb_assert (tdesc->registers_size != 0);
160 regcache = xmalloc (sizeof (*regcache));
161 return init_register_cache (regcache, tdesc, NULL);
165 free_register_cache (struct regcache *regcache)
169 if (regcache->registers_owned)
170 free (regcache->registers);
171 free (regcache->register_status);
179 regcache_cpy (struct regcache *dst, struct regcache *src)
181 gdb_assert (src != NULL && dst != NULL);
182 gdb_assert (src->tdesc == dst->tdesc);
183 gdb_assert (src != dst);
185 memcpy (dst->registers, src->registers, src->tdesc->registers_size);
186 #ifndef IN_PROCESS_AGENT
187 if (dst->register_status != NULL && src->register_status != NULL)
188 memcpy (dst->register_status, src->register_status,
189 src->tdesc->num_registers);
191 dst->registers_valid = src->registers_valid;
195 #ifndef IN_PROCESS_AGENT
198 registers_to_string (struct regcache *regcache, char *buf)
200 unsigned char *registers = regcache->registers;
201 const struct target_desc *tdesc = regcache->tdesc;
204 for (i = 0; i < tdesc->num_registers; i++)
206 if (regcache->register_status[i] == REG_VALID)
208 bin2hex (registers, buf, register_size (tdesc, i));
209 buf += register_size (tdesc, i) * 2;
213 memset (buf, 'x', register_size (tdesc, i) * 2);
214 buf += register_size (tdesc, i) * 2;
216 registers += register_size (tdesc, i);
222 registers_from_string (struct regcache *regcache, char *buf)
224 int len = strlen (buf);
225 unsigned char *registers = regcache->registers;
226 const struct target_desc *tdesc = regcache->tdesc;
228 if (len != tdesc->registers_size * 2)
230 warning ("Wrong sized register packet (expected %d bytes, got %d)",
231 2 * tdesc->registers_size, len);
232 if (len > tdesc->registers_size * 2)
233 len = tdesc->registers_size * 2;
235 hex2bin (buf, registers, len / 2);
239 find_register_by_name (const struct target_desc *tdesc, const char *name)
243 for (i = 0; i < tdesc->num_registers; i++)
244 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
245 return &tdesc->reg_defs[i];
246 fatal ("Unknown register %s requested", name);
251 find_regno (const struct target_desc *tdesc, const char *name)
255 for (i = 0; i < tdesc->num_registers; i++)
256 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
258 fatal ("Unknown register %s requested", name);
263 find_register_by_number (const struct target_desc *tdesc, int n)
265 return &tdesc->reg_defs[n];
270 #ifndef IN_PROCESS_AGENT
272 free_register_cache_thread (struct thread_info *thread)
274 struct regcache *regcache
275 = (struct regcache *) inferior_regcache_data (thread);
277 if (regcache != NULL)
279 regcache_invalidate_thread (thread);
280 free_register_cache (regcache);
281 set_inferior_regcache_data (thread, NULL);
286 free_register_cache_thread_one (struct inferior_list_entry *entry)
288 struct thread_info *thread = (struct thread_info *) entry;
290 free_register_cache_thread (thread);
294 regcache_release (void)
296 /* Flush and release all pre-existing register caches. */
297 for_each_inferior (&all_threads, free_register_cache_thread_one);
302 register_cache_size (const struct target_desc *tdesc)
304 return tdesc->registers_size;
308 register_size (const struct target_desc *tdesc, int n)
310 return tdesc->reg_defs[n].size / 8;
313 static unsigned char *
314 register_data (struct regcache *regcache, int n, int fetch)
316 return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
319 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
320 If BUF is NULL, the register's value is recorded as
324 supply_register (struct regcache *regcache, int n, const void *buf)
328 memcpy (register_data (regcache, n, 0), buf,
329 register_size (regcache->tdesc, n));
330 #ifndef IN_PROCESS_AGENT
331 if (regcache->register_status != NULL)
332 regcache->register_status[n] = REG_VALID;
337 memset (register_data (regcache, n, 0), 0,
338 register_size (regcache->tdesc, n));
339 #ifndef IN_PROCESS_AGENT
340 if (regcache->register_status != NULL)
341 regcache->register_status[n] = REG_UNAVAILABLE;
346 /* Supply register N with value zero to REGCACHE. */
349 supply_register_zeroed (struct regcache *regcache, int n)
351 memset (register_data (regcache, n, 0), 0,
352 register_size (regcache->tdesc, n));
353 #ifndef IN_PROCESS_AGENT
354 if (regcache->register_status != NULL)
355 regcache->register_status[n] = REG_VALID;
359 /* Supply the whole register set whose contents are stored in BUF, to
360 REGCACHE. If BUF is NULL, all the registers' values are recorded
364 supply_regblock (struct regcache *regcache, const void *buf)
368 const struct target_desc *tdesc = regcache->tdesc;
370 memcpy (regcache->registers, buf, tdesc->registers_size);
371 #ifndef IN_PROCESS_AGENT
375 for (i = 0; i < tdesc->num_registers; i++)
376 regcache->register_status[i] = REG_VALID;
382 const struct target_desc *tdesc = regcache->tdesc;
384 memset (regcache->registers, 0, tdesc->registers_size);
385 #ifndef IN_PROCESS_AGENT
389 for (i = 0; i < tdesc->num_registers; i++)
390 regcache->register_status[i] = REG_UNAVAILABLE;
396 #ifndef IN_PROCESS_AGENT
399 supply_register_by_name (struct regcache *regcache,
400 const char *name, const void *buf)
402 supply_register (regcache, find_regno (regcache->tdesc, name), buf);
408 collect_register (struct regcache *regcache, int n, void *buf)
410 memcpy (buf, register_data (regcache, n, 1),
411 register_size (regcache->tdesc, n));
414 #ifndef IN_PROCESS_AGENT
417 collect_register_as_string (struct regcache *regcache, int n, char *buf)
419 bin2hex (register_data (regcache, n, 1), buf,
420 register_size (regcache->tdesc, n));
424 collect_register_by_name (struct regcache *regcache,
425 const char *name, void *buf)
427 collect_register (regcache, find_regno (regcache->tdesc, name), buf);
430 /* Special handling for register PC. */
433 regcache_read_pc (struct regcache *regcache)
437 if (the_target->read_pc)
438 pc_val = the_target->read_pc (regcache);
440 internal_error (__FILE__, __LINE__,
441 "regcache_read_pc: Unable to find PC");
447 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
449 if (the_target->write_pc)
450 the_target->write_pc (regcache, pc);
452 internal_error (__FILE__, __LINE__,
453 "regcache_write_pc: Unable to update PC");