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_inferior = current_inferior;
54 current_inferior = thread;
55 fetch_inferior_registers (regcache, -1);
56 current_inferior = saved_inferior;
57 regcache->registers_valid = 1;
64 regcache_invalidate_thread (struct thread_info *thread)
66 struct regcache *regcache;
68 regcache = (struct regcache *) inferior_regcache_data (thread);
73 if (regcache->registers_valid)
75 struct thread_info *saved_inferior = current_inferior;
77 current_inferior = thread;
78 store_inferior_registers (regcache, -1);
79 current_inferior = saved_inferior;
82 regcache->registers_valid = 0;
86 regcache_invalidate_one (struct inferior_list_entry *entry,
89 struct thread_info *thread = (struct thread_info *) entry;
90 int pid = *(int *) pid_p;
92 /* Only invalidate the regcaches of threads of this process. */
93 if (ptid_get_pid (entry->id) == pid)
94 regcache_invalidate_thread (thread);
100 regcache_invalidate (void)
102 /* Only update the threads of the current process. */
103 int pid = ptid_get_pid (current_inferior->entry.id);
105 find_inferior (&all_threads, regcache_invalidate_one, &pid);
111 init_register_cache (struct regcache *regcache,
112 const struct target_desc *tdesc,
113 unsigned char *regbuf)
117 #ifndef IN_PROCESS_AGENT
118 /* Make sure to zero-initialize the register cache when it is
119 created, in case there are registers the target never
120 fetches. This way they'll read as zero instead of
122 regcache->tdesc = tdesc;
123 regcache->registers = xcalloc (1, tdesc->registers_size);
124 regcache->registers_owned = 1;
125 regcache->register_status = xcalloc (1, tdesc->num_registers);
126 gdb_assert (REG_UNAVAILABLE == 0);
128 gdb_assert_not_reached ("can't allocate memory from the heap");
133 regcache->tdesc = tdesc;
134 regcache->registers = regbuf;
135 regcache->registers_owned = 0;
136 #ifndef IN_PROCESS_AGENT
137 regcache->register_status = NULL;
141 regcache->registers_valid = 0;
146 #ifndef IN_PROCESS_AGENT
149 new_register_cache (const struct target_desc *tdesc)
151 struct regcache *regcache;
153 gdb_assert (tdesc->registers_size != 0);
155 regcache = xmalloc (sizeof (*regcache));
156 return init_register_cache (regcache, tdesc, NULL);
160 free_register_cache (struct regcache *regcache)
164 if (regcache->registers_owned)
165 free (regcache->registers);
166 free (regcache->register_status);
174 regcache_cpy (struct regcache *dst, struct regcache *src)
176 gdb_assert (src != NULL && dst != NULL);
177 gdb_assert (src->tdesc == dst->tdesc);
178 gdb_assert (src != dst);
180 memcpy (dst->registers, src->registers, src->tdesc->registers_size);
181 #ifndef IN_PROCESS_AGENT
182 if (dst->register_status != NULL && src->register_status != NULL)
183 memcpy (dst->register_status, src->register_status,
184 src->tdesc->num_registers);
186 dst->registers_valid = src->registers_valid;
190 #ifndef IN_PROCESS_AGENT
193 registers_to_string (struct regcache *regcache, char *buf)
195 unsigned char *registers = regcache->registers;
196 const struct target_desc *tdesc = regcache->tdesc;
199 for (i = 0; i < tdesc->num_registers; i++)
201 if (regcache->register_status[i] == REG_VALID)
203 bin2hex (registers, buf, register_size (tdesc, i));
204 buf += register_size (tdesc, i) * 2;
208 memset (buf, 'x', register_size (tdesc, i) * 2);
209 buf += register_size (tdesc, i) * 2;
211 registers += register_size (tdesc, i);
217 registers_from_string (struct regcache *regcache, char *buf)
219 int len = strlen (buf);
220 unsigned char *registers = regcache->registers;
221 const struct target_desc *tdesc = regcache->tdesc;
223 if (len != tdesc->registers_size * 2)
225 warning ("Wrong sized register packet (expected %d bytes, got %d)",
226 2 * tdesc->registers_size, len);
227 if (len > tdesc->registers_size * 2)
228 len = tdesc->registers_size * 2;
230 hex2bin (buf, registers, len / 2);
234 find_register_by_name (const struct target_desc *tdesc, const char *name)
238 for (i = 0; i < tdesc->num_registers; i++)
239 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
240 return &tdesc->reg_defs[i];
241 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
246 find_regno (const struct target_desc *tdesc, const char *name)
250 for (i = 0; i < tdesc->num_registers; i++)
251 if (strcmp (name, tdesc->reg_defs[i].name) == 0)
253 internal_error (__FILE__, __LINE__, "Unknown register %s requested",
258 find_register_by_number (const struct target_desc *tdesc, int n)
260 return &tdesc->reg_defs[n];
265 #ifndef IN_PROCESS_AGENT
267 free_register_cache_thread (struct thread_info *thread)
269 struct regcache *regcache
270 = (struct regcache *) inferior_regcache_data (thread);
272 if (regcache != NULL)
274 regcache_invalidate_thread (thread);
275 free_register_cache (regcache);
276 set_inferior_regcache_data (thread, NULL);
281 free_register_cache_thread_one (struct inferior_list_entry *entry)
283 struct thread_info *thread = (struct thread_info *) entry;
285 free_register_cache_thread (thread);
289 regcache_release (void)
291 /* Flush and release all pre-existing register caches. */
292 for_each_inferior (&all_threads, free_register_cache_thread_one);
297 register_cache_size (const struct target_desc *tdesc)
299 return tdesc->registers_size;
303 register_size (const struct target_desc *tdesc, int n)
305 return tdesc->reg_defs[n].size / 8;
308 static unsigned char *
309 register_data (struct regcache *regcache, int n, int fetch)
311 return regcache->registers + regcache->tdesc->reg_defs[n].offset / 8;
314 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
315 If BUF is NULL, the register's value is recorded as
319 supply_register (struct regcache *regcache, int n, const void *buf)
323 memcpy (register_data (regcache, n, 0), buf,
324 register_size (regcache->tdesc, n));
325 #ifndef IN_PROCESS_AGENT
326 if (regcache->register_status != NULL)
327 regcache->register_status[n] = REG_VALID;
332 memset (register_data (regcache, n, 0), 0,
333 register_size (regcache->tdesc, n));
334 #ifndef IN_PROCESS_AGENT
335 if (regcache->register_status != NULL)
336 regcache->register_status[n] = REG_UNAVAILABLE;
341 /* Supply register N with value zero to REGCACHE. */
344 supply_register_zeroed (struct regcache *regcache, int n)
346 memset (register_data (regcache, n, 0), 0,
347 register_size (regcache->tdesc, n));
348 #ifndef IN_PROCESS_AGENT
349 if (regcache->register_status != NULL)
350 regcache->register_status[n] = REG_VALID;
354 /* Supply the whole register set whose contents are stored in BUF, to
355 REGCACHE. If BUF is NULL, all the registers' values are recorded
359 supply_regblock (struct regcache *regcache, const void *buf)
363 const struct target_desc *tdesc = regcache->tdesc;
365 memcpy (regcache->registers, buf, tdesc->registers_size);
366 #ifndef IN_PROCESS_AGENT
370 for (i = 0; i < tdesc->num_registers; i++)
371 regcache->register_status[i] = REG_VALID;
377 const struct target_desc *tdesc = regcache->tdesc;
379 memset (regcache->registers, 0, tdesc->registers_size);
380 #ifndef IN_PROCESS_AGENT
384 for (i = 0; i < tdesc->num_registers; i++)
385 regcache->register_status[i] = REG_UNAVAILABLE;
391 #ifndef IN_PROCESS_AGENT
394 supply_register_by_name (struct regcache *regcache,
395 const char *name, const void *buf)
397 supply_register (regcache, find_regno (regcache->tdesc, name), buf);
403 collect_register (struct regcache *regcache, int n, void *buf)
405 memcpy (buf, register_data (regcache, n, 1),
406 register_size (regcache->tdesc, n));
409 #ifndef IN_PROCESS_AGENT
412 collect_register_as_string (struct regcache *regcache, int n, char *buf)
414 bin2hex (register_data (regcache, n, 1), buf,
415 register_size (regcache->tdesc, n));
419 collect_register_by_name (struct regcache *regcache,
420 const char *name, void *buf)
422 collect_register (regcache, find_regno (regcache->tdesc, name), buf);
425 /* Special handling for register PC. */
428 regcache_read_pc (struct regcache *regcache)
432 if (the_target->read_pc)
433 pc_val = the_target->read_pc (regcache);
435 internal_error (__FILE__, __LINE__,
436 "regcache_read_pc: Unable to find PC");
442 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
444 if (the_target->write_pc)
445 the_target->write_pc (regcache, pc);
447 internal_error (__FILE__, __LINE__,
448 "regcache_write_pc: Unable to update PC");