1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001-2017 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
= thread_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_thread_regcache_data (thread
, regcache
);
50 if (fetch
&& regcache
->registers_valid
== 0)
52 struct thread_info
*saved_thread
= current_thread
;
54 current_thread
= thread
;
55 /* Invalidate all registers, to prevent stale left-overs. */
56 memset (regcache
->register_status
, REG_UNAVAILABLE
,
57 regcache
->tdesc
->reg_defs
.size ());
58 fetch_inferior_registers (regcache
, -1);
59 current_thread
= saved_thread
;
60 regcache
->registers_valid
= 1;
66 /* See common/common-regcache.h. */
69 get_thread_regcache_for_ptid (ptid_t ptid
)
71 return get_thread_regcache (find_thread_ptid (ptid
), 1);
75 regcache_invalidate_thread (struct thread_info
*thread
)
77 struct regcache
*regcache
;
79 regcache
= thread_regcache_data (thread
);
84 if (regcache
->registers_valid
)
86 struct thread_info
*saved_thread
= current_thread
;
88 current_thread
= thread
;
89 store_inferior_registers (regcache
, -1);
90 current_thread
= saved_thread
;
93 regcache
->registers_valid
= 0;
97 regcache_invalidate_one (struct inferior_list_entry
*entry
,
100 struct thread_info
*thread
= (struct thread_info
*) entry
;
101 int pid
= *(int *) pid_p
;
103 /* Only invalidate the regcaches of threads of this process. */
104 if (ptid_get_pid (entry
->id
) == pid
)
105 regcache_invalidate_thread (thread
);
110 /* See regcache.h. */
113 regcache_invalidate_pid (int pid
)
115 find_inferior (&all_threads
, regcache_invalidate_one
, &pid
);
118 /* See regcache.h. */
121 regcache_invalidate (void)
123 /* Only update the threads of the current process. */
124 int pid
= ptid_get_pid (current_thread
->entry
.id
);
126 regcache_invalidate_pid (pid
);
132 init_register_cache (struct regcache
*regcache
,
133 const struct target_desc
*tdesc
,
134 unsigned char *regbuf
)
138 #ifndef IN_PROCESS_AGENT
139 /* Make sure to zero-initialize the register cache when it is
140 created, in case there are registers the target never
141 fetches. This way they'll read as zero instead of
143 regcache
->tdesc
= tdesc
;
145 = (unsigned char *) xcalloc (1, tdesc
->registers_size
);
146 regcache
->registers_owned
= 1;
147 regcache
->register_status
148 = (unsigned char *) xmalloc (tdesc
->reg_defs
.size ());
149 memset ((void *) regcache
->register_status
, REG_UNAVAILABLE
,
150 tdesc
->reg_defs
.size ());
152 gdb_assert_not_reached ("can't allocate memory from the heap");
157 regcache
->tdesc
= tdesc
;
158 regcache
->registers
= regbuf
;
159 regcache
->registers_owned
= 0;
160 #ifndef IN_PROCESS_AGENT
161 regcache
->register_status
= NULL
;
165 regcache
->registers_valid
= 0;
170 #ifndef IN_PROCESS_AGENT
173 new_register_cache (const struct target_desc
*tdesc
)
175 struct regcache
*regcache
= XCNEW (struct regcache
);
177 gdb_assert (tdesc
->registers_size
!= 0);
179 return init_register_cache (regcache
, tdesc
, NULL
);
183 free_register_cache (struct regcache
*regcache
)
187 if (regcache
->registers_owned
)
188 free (regcache
->registers
);
189 free (regcache
->register_status
);
197 regcache_cpy (struct regcache
*dst
, struct regcache
*src
)
199 gdb_assert (src
!= NULL
&& dst
!= NULL
);
200 gdb_assert (src
->tdesc
== dst
->tdesc
);
201 gdb_assert (src
!= dst
);
203 memcpy (dst
->registers
, src
->registers
, src
->tdesc
->registers_size
);
204 #ifndef IN_PROCESS_AGENT
205 if (dst
->register_status
!= NULL
&& src
->register_status
!= NULL
)
206 memcpy (dst
->register_status
, src
->register_status
,
207 src
->tdesc
->reg_defs
.size ());
209 dst
->registers_valid
= src
->registers_valid
;
213 #ifndef IN_PROCESS_AGENT
216 registers_to_string (struct regcache
*regcache
, char *buf
)
218 unsigned char *registers
= regcache
->registers
;
219 const struct target_desc
*tdesc
= regcache
->tdesc
;
221 for (int i
= 0; i
< tdesc
->reg_defs
.size (); ++i
)
223 struct reg
*reg
= tdesc
->reg_defs
[i
];
225 if (regcache
->register_status
[i
] == REG_VALID
)
227 bin2hex (registers
, buf
, register_size (tdesc
, i
));
228 buf
+= register_size (tdesc
, i
) * 2;
232 memset (buf
, 'x', register_size (tdesc
, i
) * 2);
233 buf
+= register_size (tdesc
, i
) * 2;
235 registers
+= register_size (tdesc
, i
);
241 registers_from_string (struct regcache
*regcache
, char *buf
)
243 int len
= strlen (buf
);
244 unsigned char *registers
= regcache
->registers
;
245 const struct target_desc
*tdesc
= regcache
->tdesc
;
247 if (len
!= tdesc
->registers_size
* 2)
249 warning ("Wrong sized register packet (expected %d bytes, got %d)",
250 2 * tdesc
->registers_size
, len
);
251 if (len
> tdesc
->registers_size
* 2)
252 len
= tdesc
->registers_size
* 2;
254 hex2bin (buf
, registers
, len
/ 2);
258 find_regno (const struct target_desc
*tdesc
, const char *name
)
260 for (int i
= 0; i
< tdesc
->reg_defs
.size (); ++i
)
262 struct reg
*reg
= tdesc
->reg_defs
[i
];
264 if (strcmp (name
, reg
->name
) == 0)
267 internal_error (__FILE__
, __LINE__
, "Unknown register %s requested",
274 find_register_by_number (const struct target_desc
*tdesc
, int n
)
276 return tdesc
->reg_defs
[n
];
279 #ifndef IN_PROCESS_AGENT
281 free_register_cache_thread (struct thread_info
*thread
)
283 struct regcache
*regcache
= thread_regcache_data (thread
);
285 if (regcache
!= NULL
)
287 regcache_invalidate_thread (thread
);
288 free_register_cache (regcache
);
289 set_thread_regcache_data (thread
, NULL
);
294 free_register_cache_thread_one (struct inferior_list_entry
*entry
)
296 struct thread_info
*thread
= (struct thread_info
*) entry
;
298 free_register_cache_thread (thread
);
302 regcache_release (void)
304 /* Flush and release all pre-existing register caches. */
305 for_each_inferior (&all_threads
, free_register_cache_thread_one
);
310 register_cache_size (const struct target_desc
*tdesc
)
312 return tdesc
->registers_size
;
316 register_size (const struct target_desc
*tdesc
, int n
)
318 return find_register_by_number (tdesc
, n
)->size
/ 8;
321 /* See common/common-regcache.h. */
324 regcache_register_size (const struct regcache
*regcache
, int n
)
326 return register_size (regcache
->tdesc
, n
);
329 static unsigned char *
330 register_data (struct regcache
*regcache
, int n
, int fetch
)
332 return (regcache
->registers
333 + find_register_by_number (regcache
->tdesc
, n
)->offset
/ 8);
336 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
337 If BUF is NULL, the register's value is recorded as
341 supply_register (struct regcache
*regcache
, int n
, const void *buf
)
345 memcpy (register_data (regcache
, n
, 0), buf
,
346 register_size (regcache
->tdesc
, n
));
347 #ifndef IN_PROCESS_AGENT
348 if (regcache
->register_status
!= NULL
)
349 regcache
->register_status
[n
] = REG_VALID
;
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_UNAVAILABLE
;
363 /* Supply register N with value zero to REGCACHE. */
366 supply_register_zeroed (struct regcache
*regcache
, int n
)
368 memset (register_data (regcache
, n
, 0), 0,
369 register_size (regcache
->tdesc
, n
));
370 #ifndef IN_PROCESS_AGENT
371 if (regcache
->register_status
!= NULL
)
372 regcache
->register_status
[n
] = REG_VALID
;
376 /* Supply the whole register set whose contents are stored in BUF, to
377 REGCACHE. If BUF is NULL, all the registers' values are recorded
381 supply_regblock (struct regcache
*regcache
, const void *buf
)
385 const struct target_desc
*tdesc
= regcache
->tdesc
;
387 memcpy (regcache
->registers
, buf
, tdesc
->registers_size
);
388 #ifndef IN_PROCESS_AGENT
392 for (i
= 0; i
< tdesc
->reg_defs
.size (); i
++)
393 regcache
->register_status
[i
] = REG_VALID
;
399 const struct target_desc
*tdesc
= regcache
->tdesc
;
401 memset (regcache
->registers
, 0, tdesc
->registers_size
);
402 #ifndef IN_PROCESS_AGENT
406 for (i
= 0; i
< tdesc
->reg_defs
.size (); i
++)
407 regcache
->register_status
[i
] = REG_UNAVAILABLE
;
413 #ifndef IN_PROCESS_AGENT
416 supply_register_by_name (struct regcache
*regcache
,
417 const char *name
, const void *buf
)
419 supply_register (regcache
, find_regno (regcache
->tdesc
, name
), buf
);
425 collect_register (struct regcache
*regcache
, int n
, void *buf
)
427 memcpy (buf
, register_data (regcache
, n
, 1),
428 register_size (regcache
->tdesc
, n
));
432 regcache_raw_read_unsigned (struct regcache
*regcache
, int regnum
,
437 gdb_assert (regcache
!= NULL
);
438 gdb_assert (regnum
>= 0
439 && regnum
< regcache
->tdesc
->reg_defs
.size ());
441 size
= register_size (regcache
->tdesc
, regnum
);
443 if (size
> (int) sizeof (ULONGEST
))
444 error (_("That operation is not available on integers of more than"
446 (int) sizeof (ULONGEST
));
449 collect_register (regcache
, regnum
, val
);
454 #ifndef IN_PROCESS_AGENT
457 collect_register_as_string (struct regcache
*regcache
, int n
, char *buf
)
459 bin2hex (register_data (regcache
, n
, 1), buf
,
460 register_size (regcache
->tdesc
, n
));
464 collect_register_by_name (struct regcache
*regcache
,
465 const char *name
, void *buf
)
467 collect_register (regcache
, find_regno (regcache
->tdesc
, name
), buf
);
470 /* Special handling for register PC. */
473 regcache_read_pc (struct regcache
*regcache
)
477 if (the_target
->read_pc
)
478 pc_val
= the_target
->read_pc (regcache
);
480 internal_error (__FILE__
, __LINE__
,
481 "regcache_read_pc: Unable to find PC");
487 regcache_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
489 if (the_target
->write_pc
)
490 the_target
->write_pc (regcache
, pc
);
492 internal_error (__FILE__
, __LINE__
,
493 "regcache_write_pc: Unable to update PC");