1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
26 static int register_bytes;
28 static struct reg *reg_defs;
29 static int num_registers;
31 const char **gdbserver_expedite_regs;
33 #ifndef IN_PROCESS_AGENT
36 get_thread_regcache (struct thread_info *thread, int fetch)
38 struct regcache *regcache;
40 regcache = (struct regcache *) inferior_regcache_data (thread);
43 fatal ("no register cache");
45 if (fetch && regcache->registers_valid == 0)
47 struct thread_info *saved_inferior = current_inferior;
49 current_inferior = thread;
50 fetch_inferior_registers (regcache, -1);
51 current_inferior = saved_inferior;
52 regcache->registers_valid = 1;
59 regcache_invalidate_one (struct inferior_list_entry *entry)
61 struct thread_info *thread = (struct thread_info *) entry;
62 struct regcache *regcache;
64 regcache = (struct regcache *) inferior_regcache_data (thread);
69 if (regcache->registers_valid)
71 struct thread_info *saved_inferior = current_inferior;
73 current_inferior = thread;
74 store_inferior_registers (regcache, -1);
75 current_inferior = saved_inferior;
78 regcache->registers_valid = 0;
82 regcache_invalidate (void)
84 for_each_inferior (&all_threads, regcache_invalidate_one);
90 init_register_cache (struct regcache *regcache, unsigned char *regbuf)
92 #ifndef IN_PROCESS_AGENT
95 /* Make sure to zero-initialize the register cache when it is
96 created, in case there are registers the target never
97 fetches. This way they'll read as zero instead of
99 regcache->registers = xcalloc (1, register_bytes);
100 regcache->registers_owned = 1;
105 fatal ("init_register_cache: can't allocate memory from the heap");
109 regcache->registers = regbuf;
110 regcache->registers_owned = 0;
113 regcache->registers_valid = 0;
118 #ifndef IN_PROCESS_AGENT
121 new_register_cache (void)
123 struct regcache *regcache;
125 if (register_bytes == 0)
126 return NULL; /* The architecture hasn't been initialized yet. */
128 regcache = xmalloc (sizeof (*regcache));
129 return init_register_cache (regcache, NULL);
133 free_register_cache (struct regcache *regcache)
137 if (regcache->registers_owned)
138 free (regcache->registers);
146 regcache_cpy (struct regcache *dst, struct regcache *src)
148 memcpy (dst->registers, src->registers, register_bytes);
149 dst->registers_valid = src->registers_valid;
152 #ifndef IN_PROCESS_AGENT
154 realloc_register_cache (struct inferior_list_entry *thread_p)
156 struct thread_info *thread = (struct thread_info *) thread_p;
157 struct regcache *regcache
158 = (struct regcache *) inferior_regcache_data (thread);
160 if (regcache != NULL)
161 regcache_invalidate_one (thread_p);
162 free_register_cache (regcache);
163 set_inferior_regcache_data (thread, new_register_cache ());
168 set_register_cache (struct reg *regs, int n)
172 #ifndef IN_PROCESS_AGENT
173 /* Before changing the register cache internal layout, flush the
174 contents of valid caches back to the threads. */
175 regcache_invalidate ();
182 for (i = 0; i < n; i++)
184 regs[i].offset = offset;
185 offset += regs[i].size;
188 register_bytes = offset / 8;
190 /* Make sure PBUFSIZ is large enough to hold a full register packet. */
191 if (2 * register_bytes + 32 > PBUFSIZ)
192 fatal ("Register packet size exceeds PBUFSIZ.");
194 #ifndef IN_PROCESS_AGENT
195 /* Re-allocate all pre-existing register caches. */
196 for_each_inferior (&all_threads, realloc_register_cache);
201 register_cache_size (void)
203 return register_bytes;
206 #ifndef IN_PROCESS_AGENT
209 registers_to_string (struct regcache *regcache, char *buf)
211 unsigned char *registers = regcache->registers;
213 convert_int_to_ascii (registers, buf, register_bytes);
217 registers_from_string (struct regcache *regcache, char *buf)
219 int len = strlen (buf);
220 unsigned char *registers = regcache->registers;
222 if (len != register_bytes * 2)
224 warning ("Wrong sized register packet (expected %d bytes, got %d)",
225 2*register_bytes, len);
226 if (len > register_bytes * 2)
227 len = register_bytes * 2;
229 convert_ascii_to_int (buf, registers, len / 2);
233 find_register_by_name (const char *name)
237 for (i = 0; i < num_registers; i++)
238 if (!strcmp (name, reg_defs[i].name))
240 fatal ("Unknown register %s requested", name);
245 find_regno (const char *name)
249 for (i = 0; i < num_registers; i++)
250 if (!strcmp (name, reg_defs[i].name))
252 fatal ("Unknown register %s requested", name);
257 find_register_by_number (int n)
265 register_size (int n)
267 return reg_defs[n].size / 8;
270 static unsigned char *
271 register_data (struct regcache *regcache, int n, int fetch)
273 return regcache->registers + (reg_defs[n].offset / 8);
277 supply_register (struct regcache *regcache, int n, const void *buf)
280 memcpy (register_data (regcache, n, 0), buf, register_size (n));
282 memset (register_data (regcache, n, 0), 0, register_size (n));
286 supply_regblock (struct regcache *regcache, const void *buf)
289 memcpy (regcache->registers, buf, register_bytes);
291 memset (regcache->registers, 0, register_bytes);
294 #ifndef IN_PROCESS_AGENT
297 supply_register_by_name (struct regcache *regcache,
298 const char *name, const void *buf)
300 supply_register (regcache, find_regno (name), buf);
306 collect_register (struct regcache *regcache, int n, void *buf)
308 memcpy (buf, register_data (regcache, n, 1), register_size (n));
311 #ifndef IN_PROCESS_AGENT
314 collect_register_as_string (struct regcache *regcache, int n, char *buf)
316 convert_int_to_ascii (register_data (regcache, n, 1),
317 buf, register_size (n));
321 collect_register_by_name (struct regcache *regcache,
322 const char *name, void *buf)
324 collect_register (regcache, find_regno (name), buf);
327 /* Special handling for register PC. */
330 regcache_read_pc (struct regcache *regcache)
334 if (the_target->read_pc)
335 pc_val = the_target->read_pc (regcache);
337 internal_error (__FILE__, __LINE__,
338 "regcache_read_pc: Unable to find PC");
344 regcache_write_pc (struct regcache *regcache, CORE_ADDR pc)
346 if (the_target->write_pc)
347 the_target->write_pc (regcache, pc);
349 internal_error (__FILE__, __LINE__,
350 "regcache_write_pc: Unable to update PC");