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git.ipfire.org Git - thirdparty/binutils-gdb.git/blob - gdb/gdbserver/regcache.c
1 /* Register support routines for the remote server for GDB.
2 Copyright (C) 2001, 2002, 2004, 2005, 2007, 2008, 2009
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 /* The private data for the register cache. Note that we have one
27 per inferior; this is primarily for simplicity, as the performance
28 benefit is minimal. */
30 struct inferior_regcache_data
33 unsigned char *registers
;
36 static int register_bytes
;
38 static struct reg
*reg_defs
;
39 static int num_registers
;
41 const char **gdbserver_expedite_regs
;
43 static struct inferior_regcache_data
*
44 get_regcache (struct thread_info
*inf
, int fetch
)
46 struct inferior_regcache_data
*regcache
;
48 regcache
= (struct inferior_regcache_data
*) inferior_regcache_data (inf
);
51 fatal ("no register cache");
53 /* FIXME - fetch registers for INF */
54 if (fetch
&& regcache
->registers_valid
== 0)
56 fetch_inferior_registers (0);
57 regcache
->registers_valid
= 1;
64 regcache_invalidate_one (struct inferior_list_entry
*entry
)
66 struct thread_info
*thread
= (struct thread_info
*) entry
;
67 struct inferior_regcache_data
*regcache
;
69 regcache
= (struct inferior_regcache_data
*) inferior_regcache_data (thread
);
71 if (regcache
->registers_valid
)
73 struct thread_info
*saved_inferior
= current_inferior
;
75 current_inferior
= thread
;
76 store_inferior_registers (-1);
77 current_inferior
= saved_inferior
;
80 regcache
->registers_valid
= 0;
84 regcache_invalidate ()
86 for_each_inferior (&all_threads
, regcache_invalidate_one
);
90 new_register_cache (void)
92 struct inferior_regcache_data
*regcache
;
94 if (register_bytes
== 0)
95 return NULL
; /* The architecture hasn't been initialized yet. */
97 regcache
= xmalloc (sizeof (*regcache
));
99 /* Make sure to zero-initialize the register cache when it is created,
100 in case there are registers the target never fetches. This way they'll
101 read as zero instead of garbage. */
102 regcache
->registers
= xcalloc (1, register_bytes
);
103 if (regcache
->registers
== NULL
)
104 fatal ("Could not allocate register cache.");
106 regcache
->registers_valid
= 0;
112 free_register_cache (void *regcache_p
)
114 struct inferior_regcache_data
*regcache
115 = (struct inferior_regcache_data
*) regcache_p
;
119 free (regcache
->registers
);
125 realloc_register_cache (struct inferior_list_entry
*thread_p
)
127 struct thread_info
*thread
= (struct thread_info
*) thread_p
;
129 free_register_cache (inferior_regcache_data (thread
));
130 set_inferior_regcache_data (thread
, new_register_cache ());
134 set_register_cache (struct reg
*regs
, int n
)
142 for (i
= 0; i
< n
; i
++)
144 regs
[i
].offset
= offset
;
145 offset
+= regs
[i
].size
;
148 register_bytes
= offset
/ 8;
150 /* Make sure PBUFSIZ is large enough to hold a full register packet. */
151 if (2 * register_bytes
+ 32 > PBUFSIZ
)
152 fatal ("Register packet size exceeds PBUFSIZ.");
154 /* Re-allocate all pre-existing register caches. */
155 for_each_inferior (&all_threads
, realloc_register_cache
);
159 registers_to_string (char *buf
)
161 unsigned char *registers
= get_regcache (current_inferior
, 1)->registers
;
163 convert_int_to_ascii (registers
, buf
, register_bytes
);
167 registers_from_string (char *buf
)
169 int len
= strlen (buf
);
170 unsigned char *registers
= get_regcache (current_inferior
, 1)->registers
;
172 if (len
!= register_bytes
* 2)
174 warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes
, len
);
175 if (len
> register_bytes
* 2)
176 len
= register_bytes
* 2;
178 convert_ascii_to_int (buf
, registers
, len
/ 2);
182 find_register_by_name (const char *name
)
186 for (i
= 0; i
< num_registers
; i
++)
187 if (!strcmp (name
, reg_defs
[i
].name
))
189 fatal ("Unknown register %s requested", name
);
194 find_regno (const char *name
)
198 for (i
= 0; i
< num_registers
; i
++)
199 if (!strcmp (name
, reg_defs
[i
].name
))
201 fatal ("Unknown register %s requested", name
);
206 find_register_by_number (int n
)
212 register_size (int n
)
214 return reg_defs
[n
].size
/ 8;
217 static unsigned char *
218 register_data (int n
, int fetch
)
220 unsigned char *registers
221 = get_regcache (current_inferior
, fetch
)->registers
;
223 return registers
+ (reg_defs
[n
].offset
/ 8);
227 supply_register (int n
, const void *buf
)
229 memcpy (register_data (n
, 0), buf
, register_size (n
));
233 supply_register_by_name (const char *name
, const void *buf
)
235 supply_register (find_regno (name
), buf
);
239 collect_register (int n
, void *buf
)
241 memcpy (buf
, register_data (n
, 1), register_size (n
));
245 collect_register_as_string (int n
, char *buf
)
247 convert_int_to_ascii (register_data (n
, 1), buf
, register_size (n
));
251 collect_register_by_name (const char *name
, void *buf
)
253 collect_register (find_regno (name
), buf
);