1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001-2002, 2004-2005, 2007-2012 Free Software
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;
101 regcache
->register_status
= xcalloc (1, num_registers
);
102 gdb_assert (REG_UNAVAILABLE
== 0);
107 fatal ("init_register_cache: can't allocate memory from the heap");
111 regcache
->registers
= regbuf
;
112 regcache
->registers_owned
= 0;
113 #ifndef IN_PROCESS_AGENT
114 regcache
->register_status
= NULL
;
118 regcache
->registers_valid
= 0;
123 #ifndef IN_PROCESS_AGENT
126 new_register_cache (void)
128 struct regcache
*regcache
;
130 if (register_bytes
== 0)
131 return NULL
; /* The architecture hasn't been initialized yet. */
133 regcache
= xmalloc (sizeof (*regcache
));
134 return init_register_cache (regcache
, NULL
);
138 free_register_cache (struct regcache
*regcache
)
142 if (regcache
->registers_owned
)
143 free (regcache
->registers
);
144 free (regcache
->register_status
);
152 regcache_cpy (struct regcache
*dst
, struct regcache
*src
)
154 memcpy (dst
->registers
, src
->registers
, register_bytes
);
155 #ifndef IN_PROCESS_AGENT
156 if (dst
->register_status
!= NULL
&& src
->register_status
!= NULL
)
157 memcpy (dst
->register_status
, src
->register_status
, num_registers
);
159 dst
->registers_valid
= src
->registers_valid
;
162 #ifndef IN_PROCESS_AGENT
164 realloc_register_cache (struct inferior_list_entry
*thread_p
)
166 struct thread_info
*thread
= (struct thread_info
*) thread_p
;
167 struct regcache
*regcache
168 = (struct regcache
*) inferior_regcache_data (thread
);
170 if (regcache
!= NULL
)
171 regcache_invalidate_one (thread_p
);
172 free_register_cache (regcache
);
173 set_inferior_regcache_data (thread
, new_register_cache ());
178 set_register_cache (struct reg
*regs
, int n
)
182 #ifndef IN_PROCESS_AGENT
183 /* Before changing the register cache internal layout, flush the
184 contents of valid caches back to the threads. */
185 regcache_invalidate ();
192 for (i
= 0; i
< n
; i
++)
194 regs
[i
].offset
= offset
;
195 offset
+= regs
[i
].size
;
198 register_bytes
= offset
/ 8;
200 /* Make sure PBUFSIZ is large enough to hold a full register packet. */
201 if (2 * register_bytes
+ 32 > PBUFSIZ
)
202 fatal ("Register packet size exceeds PBUFSIZ.");
204 #ifndef IN_PROCESS_AGENT
205 /* Re-allocate all pre-existing register caches. */
206 for_each_inferior (&all_threads
, realloc_register_cache
);
211 register_cache_size (void)
213 return register_bytes
;
216 #ifndef IN_PROCESS_AGENT
219 registers_to_string (struct regcache
*regcache
, char *buf
)
221 unsigned char *registers
= regcache
->registers
;
224 for (i
= 0; i
< num_registers
; i
++)
226 if (regcache
->register_status
[i
] == REG_VALID
)
228 convert_int_to_ascii (registers
, buf
, register_size (i
));
229 buf
+= register_size (i
) * 2;
233 memset (buf
, 'x', register_size (i
) * 2);
234 buf
+= register_size (i
) * 2;
236 registers
+= register_size (i
);
242 registers_from_string (struct regcache
*regcache
, char *buf
)
244 int len
= strlen (buf
);
245 unsigned char *registers
= regcache
->registers
;
247 if (len
!= register_bytes
* 2)
249 warning ("Wrong sized register packet (expected %d bytes, got %d)",
250 2*register_bytes
, len
);
251 if (len
> register_bytes
* 2)
252 len
= register_bytes
* 2;
254 convert_ascii_to_int (buf
, registers
, len
/ 2);
258 find_register_by_name (const char *name
)
262 for (i
= 0; i
< num_registers
; i
++)
263 if (!strcmp (name
, reg_defs
[i
].name
))
265 fatal ("Unknown register %s requested", name
);
270 find_regno (const char *name
)
274 for (i
= 0; i
< num_registers
; i
++)
275 if (!strcmp (name
, reg_defs
[i
].name
))
277 fatal ("Unknown register %s requested", name
);
282 find_register_by_number (int n
)
290 register_size (int n
)
292 return reg_defs
[n
].size
/ 8;
295 static unsigned char *
296 register_data (struct regcache
*regcache
, int n
, int fetch
)
298 return regcache
->registers
+ (reg_defs
[n
].offset
/ 8);
301 /* Supply register N, whose contents are stored in BUF, to REGCACHE.
302 If BUF is NULL, the register's value is recorded as
306 supply_register (struct regcache
*regcache
, int n
, const void *buf
)
310 memcpy (register_data (regcache
, n
, 0), buf
, register_size (n
));
311 #ifndef IN_PROCESS_AGENT
312 if (regcache
->register_status
!= NULL
)
313 regcache
->register_status
[n
] = REG_VALID
;
318 memset (register_data (regcache
, n
, 0), 0, register_size (n
));
319 #ifndef IN_PROCESS_AGENT
320 if (regcache
->register_status
!= NULL
)
321 regcache
->register_status
[n
] = REG_UNAVAILABLE
;
326 /* Supply register N with value zero to REGCACHE. */
329 supply_register_zeroed (struct regcache
*regcache
, int n
)
331 memset (register_data (regcache
, n
, 0), 0, register_size (n
));
332 #ifndef IN_PROCESS_AGENT
333 if (regcache
->register_status
!= NULL
)
334 regcache
->register_status
[n
] = REG_VALID
;
338 /* Supply the whole register set whose contents are stored in BUF, to
339 REGCACHE. If BUF is NULL, all the registers' values are recorded
343 supply_regblock (struct regcache
*regcache
, const void *buf
)
347 memcpy (regcache
->registers
, buf
, register_bytes
);
348 #ifndef IN_PROCESS_AGENT
352 for (i
= 0; i
< num_registers
; i
++)
353 regcache
->register_status
[i
] = REG_VALID
;
359 memset (regcache
->registers
, 0, register_bytes
);
360 #ifndef IN_PROCESS_AGENT
364 for (i
= 0; i
< num_registers
; i
++)
365 regcache
->register_status
[i
] = REG_UNAVAILABLE
;
371 #ifndef IN_PROCESS_AGENT
374 supply_register_by_name (struct regcache
*regcache
,
375 const char *name
, const void *buf
)
377 supply_register (regcache
, find_regno (name
), buf
);
383 collect_register (struct regcache
*regcache
, int n
, void *buf
)
385 memcpy (buf
, register_data (regcache
, n
, 1), register_size (n
));
388 #ifndef IN_PROCESS_AGENT
391 collect_register_as_string (struct regcache
*regcache
, int n
, char *buf
)
393 convert_int_to_ascii (register_data (regcache
, n
, 1),
394 buf
, register_size (n
));
398 collect_register_by_name (struct regcache
*regcache
,
399 const char *name
, void *buf
)
401 collect_register (regcache
, find_regno (name
), buf
);
404 /* Special handling for register PC. */
407 regcache_read_pc (struct regcache
*regcache
)
411 if (the_target
->read_pc
)
412 pc_val
= the_target
->read_pc (regcache
);
414 internal_error (__FILE__
, __LINE__
,
415 "regcache_read_pc: Unable to find PC");
421 regcache_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
423 if (the_target
->write_pc
)
424 the_target
->write_pc (regcache
, pc
);
426 internal_error (__FILE__
, __LINE__
,
427 "regcache_write_pc: Unable to update PC");
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