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
)
120 #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);
136 fatal ("init_register_cache: can't allocate memory from the heap");
140 regcache
->tdesc
= tdesc
;
141 regcache
->registers
= regbuf
;
142 regcache
->registers_owned
= 0;
143 #ifndef IN_PROCESS_AGENT
144 regcache
->register_status
= NULL
;
148 regcache
->registers_valid
= 0;
153 #ifndef IN_PROCESS_AGENT
156 new_register_cache (const struct target_desc
*tdesc
)
158 struct regcache
*regcache
;
160 gdb_assert (tdesc
->registers_size
!= 0);
162 regcache
= xmalloc (sizeof (*regcache
));
163 return init_register_cache (regcache
, tdesc
, NULL
);
167 free_register_cache (struct regcache
*regcache
)
171 if (regcache
->registers_owned
)
172 free (regcache
->registers
);
173 free (regcache
->register_status
);
181 regcache_cpy (struct regcache
*dst
, struct regcache
*src
)
183 gdb_assert (src
!= NULL
&& dst
!= NULL
);
184 gdb_assert (src
->tdesc
== dst
->tdesc
);
185 gdb_assert (src
!= dst
);
187 memcpy (dst
->registers
, src
->registers
, src
->tdesc
->registers_size
);
188 #ifndef IN_PROCESS_AGENT
189 if (dst
->register_status
!= NULL
&& src
->register_status
!= NULL
)
190 memcpy (dst
->register_status
, src
->register_status
,
191 src
->tdesc
->num_registers
);
193 dst
->registers_valid
= src
->registers_valid
;
197 #ifndef IN_PROCESS_AGENT
200 registers_to_string (struct regcache
*regcache
, char *buf
)
202 unsigned char *registers
= regcache
->registers
;
203 const struct target_desc
*tdesc
= regcache
->tdesc
;
206 for (i
= 0; i
< tdesc
->num_registers
; i
++)
208 if (regcache
->register_status
[i
] == REG_VALID
)
210 bin2hex (registers
, buf
, register_size (tdesc
, i
));
211 buf
+= register_size (tdesc
, i
) * 2;
215 memset (buf
, 'x', register_size (tdesc
, i
) * 2);
216 buf
+= register_size (tdesc
, i
) * 2;
218 registers
+= register_size (tdesc
, i
);
224 registers_from_string (struct regcache
*regcache
, char *buf
)
226 int len
= strlen (buf
);
227 unsigned char *registers
= regcache
->registers
;
228 const struct target_desc
*tdesc
= regcache
->tdesc
;
230 if (len
!= tdesc
->registers_size
* 2)
232 warning ("Wrong sized register packet (expected %d bytes, got %d)",
233 2 * tdesc
->registers_size
, len
);
234 if (len
> tdesc
->registers_size
* 2)
235 len
= tdesc
->registers_size
* 2;
237 hex2bin (buf
, registers
, len
/ 2);
241 find_register_by_name (const struct target_desc
*tdesc
, const char *name
)
245 for (i
= 0; i
< tdesc
->num_registers
; i
++)
246 if (strcmp (name
, tdesc
->reg_defs
[i
].name
) == 0)
247 return &tdesc
->reg_defs
[i
];
248 fatal ("Unknown register %s requested", name
);
253 find_regno (const struct target_desc
*tdesc
, const char *name
)
257 for (i
= 0; i
< tdesc
->num_registers
; i
++)
258 if (strcmp (name
, tdesc
->reg_defs
[i
].name
) == 0)
260 fatal ("Unknown register %s requested", name
);
265 find_register_by_number (const struct target_desc
*tdesc
, int n
)
267 return &tdesc
->reg_defs
[n
];
272 #ifndef IN_PROCESS_AGENT
274 free_register_cache_thread (struct thread_info
*thread
)
276 struct regcache
*regcache
277 = (struct regcache
*) inferior_regcache_data (thread
);
279 if (regcache
!= NULL
)
281 regcache_invalidate_thread (thread
);
282 free_register_cache (regcache
);
283 set_inferior_regcache_data (thread
, NULL
);
288 free_register_cache_thread_one (struct inferior_list_entry
*entry
)
290 struct thread_info
*thread
= (struct thread_info
*) entry
;
292 free_register_cache_thread (thread
);
296 regcache_release (void)
298 /* Flush and release all pre-existing register caches. */
299 for_each_inferior (&all_threads
, free_register_cache_thread_one
);
304 register_cache_size (const struct target_desc
*tdesc
)
306 return tdesc
->registers_size
;
310 register_size (const struct target_desc
*tdesc
, int n
)
312 return tdesc
->reg_defs
[n
].size
/ 8;
315 static unsigned char *
316 register_data (struct regcache
*regcache
, int n
, int fetch
)
318 return regcache
->registers
+ regcache
->tdesc
->reg_defs
[n
].offset
/ 8;
321 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
322 If BUF is NULL, the register's value is recorded as
326 supply_register (struct regcache
*regcache
, int n
, const void *buf
)
330 memcpy (register_data (regcache
, n
, 0), buf
,
331 register_size (regcache
->tdesc
, n
));
332 #ifndef IN_PROCESS_AGENT
333 if (regcache
->register_status
!= NULL
)
334 regcache
->register_status
[n
] = REG_VALID
;
339 memset (register_data (regcache
, n
, 0), 0,
340 register_size (regcache
->tdesc
, n
));
341 #ifndef IN_PROCESS_AGENT
342 if (regcache
->register_status
!= NULL
)
343 regcache
->register_status
[n
] = REG_UNAVAILABLE
;
348 /* Supply register N with value zero to REGCACHE. */
351 supply_register_zeroed (struct regcache
*regcache
, int n
)
353 memset (register_data (regcache
, n
, 0), 0,
354 register_size (regcache
->tdesc
, n
));
355 #ifndef IN_PROCESS_AGENT
356 if (regcache
->register_status
!= NULL
)
357 regcache
->register_status
[n
] = REG_VALID
;
361 /* Supply the whole register set whose contents are stored in BUF, to
362 REGCACHE. If BUF is NULL, all the registers' values are recorded
366 supply_regblock (struct regcache
*regcache
, const void *buf
)
370 const struct target_desc
*tdesc
= regcache
->tdesc
;
372 memcpy (regcache
->registers
, buf
, tdesc
->registers_size
);
373 #ifndef IN_PROCESS_AGENT
377 for (i
= 0; i
< tdesc
->num_registers
; i
++)
378 regcache
->register_status
[i
] = REG_VALID
;
384 const struct target_desc
*tdesc
= regcache
->tdesc
;
386 memset (regcache
->registers
, 0, tdesc
->registers_size
);
387 #ifndef IN_PROCESS_AGENT
391 for (i
= 0; i
< tdesc
->num_registers
; i
++)
392 regcache
->register_status
[i
] = REG_UNAVAILABLE
;
398 #ifndef IN_PROCESS_AGENT
401 supply_register_by_name (struct regcache
*regcache
,
402 const char *name
, const void *buf
)
404 supply_register (regcache
, find_regno (regcache
->tdesc
, name
), buf
);
410 collect_register (struct regcache
*regcache
, int n
, void *buf
)
412 memcpy (buf
, register_data (regcache
, n
, 1),
413 register_size (regcache
->tdesc
, n
));
416 #ifndef IN_PROCESS_AGENT
419 collect_register_as_string (struct regcache
*regcache
, int n
, char *buf
)
421 bin2hex (register_data (regcache
, n
, 1), buf
,
422 register_size (regcache
->tdesc
, n
));
426 collect_register_by_name (struct regcache
*regcache
,
427 const char *name
, void *buf
)
429 collect_register (regcache
, find_regno (regcache
->tdesc
, name
), buf
);
432 /* Special handling for register PC. */
435 regcache_read_pc (struct regcache
*regcache
)
439 if (the_target
->read_pc
)
440 pc_val
= the_target
->read_pc (regcache
);
442 internal_error (__FILE__
, __LINE__
,
443 "regcache_read_pc: Unable to find PC");
449 regcache_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
451 if (the_target
->write_pc
)
452 the_target
->write_pc (regcache
, pc
);
454 internal_error (__FILE__
, __LINE__
,
455 "regcache_write_pc: Unable to update PC");