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[deliverable/binutils-gdb.git] / gdb / gdbserver / regcache.c
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0a30fbc4 1/* Register support routines for the remote server for GDB.
2a68b70e 2 Copyright 2001, 2002, 2004
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3 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
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 2 of the License, or
10 (at your option) any later version.
11
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.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22#include "server.h"
23#include "regdef.h"
24
25#include <stdlib.h>
26#include <string.h>
27
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28/* The private data for the register cache. Note that we have one
29 per inferior; this is primarily for simplicity, as the performance
30 benefit is minimal. */
31
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32struct inferior_regcache_data
33{
0d62e5e8 34 int registers_valid;
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35 char *registers;
36};
37
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38static int register_bytes;
39
40static struct reg *reg_defs;
41static int num_registers;
42
43const char **gdbserver_expedite_regs;
44
c04a1aa8 45static struct inferior_regcache_data *
0d62e5e8 46get_regcache (struct thread_info *inf, int fetch)
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47{
48 struct inferior_regcache_data *regcache;
49
50 regcache = (struct inferior_regcache_data *) inferior_regcache_data (inf);
51
52 if (regcache == NULL)
53 fatal ("no register cache");
54
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55 /* FIXME - fetch registers for INF */
56 if (fetch && regcache->registers_valid == 0)
57 {
58 fetch_inferior_registers (0);
59 regcache->registers_valid = 1;
60 }
61
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62 return regcache;
63}
64
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65void
66regcache_invalidate_one (struct inferior_list_entry *entry)
67{
68 struct thread_info *thread = (struct thread_info *) entry;
69 struct inferior_regcache_data *regcache;
70
71 regcache = (struct inferior_regcache_data *) inferior_regcache_data (thread);
72
73 if (regcache->registers_valid)
74 {
75 struct thread_info *saved_inferior = current_inferior;
76
77 current_inferior = thread;
78 store_inferior_registers (-1);
79 current_inferior = saved_inferior;
80 }
81
82 regcache->registers_valid = 0;
83}
84
85void
86regcache_invalidate ()
87{
88 for_each_inferior (&all_threads, regcache_invalidate_one);
89}
90
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91int
92registers_length (void)
93{
94 return 2 * register_bytes;
95}
96
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97void *
98new_register_cache (void)
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99{
100 struct inferior_regcache_data *regcache;
101
102 regcache = malloc (sizeof (*regcache));
103
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104 /* Make sure to zero-initialize the register cache when it is created,
105 in case there are registers the target never fetches. This way they'll
106 read as zero instead of garbage. */
107 regcache->registers = calloc (1, register_bytes);
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108 if (regcache->registers == NULL)
109 fatal ("Could not allocate register cache.");
110
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111 regcache->registers_valid = 0;
112
113 return regcache;
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114}
115
116void
0d62e5e8 117free_register_cache (void *regcache_p)
c04a1aa8 118{
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119 struct inferior_regcache_data *regcache
120 = (struct inferior_regcache_data *) regcache_p;
121
122 free (regcache->registers);
123 free (regcache);
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124}
125
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126void
127set_register_cache (struct reg *regs, int n)
128{
129 int offset, i;
130
131 reg_defs = regs;
132 num_registers = n;
133
134 offset = 0;
135 for (i = 0; i < n; i++)
136 {
137 regs[i].offset = offset;
138 offset += regs[i].size;
139 }
140
141 register_bytes = offset / 8;
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142}
143
144void
145registers_to_string (char *buf)
146{
0d62e5e8 147 char *registers = get_regcache (current_inferior, 1)->registers;
c04a1aa8 148
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149 convert_int_to_ascii (registers, buf, register_bytes);
150}
151
152void
153registers_from_string (char *buf)
154{
155 int len = strlen (buf);
0d62e5e8 156 char *registers = get_regcache (current_inferior, 1)->registers;
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157
158 if (len != register_bytes * 2)
159 {
160 warning ("Wrong sized register packet (expected %d bytes, got %d)", 2*register_bytes, len);
161 if (len > register_bytes * 2)
162 len = register_bytes * 2;
163 }
164 convert_ascii_to_int (buf, registers, len / 2);
165}
166
167struct reg *
168find_register_by_name (const char *name)
169{
170 int i;
171
172 for (i = 0; i < num_registers; i++)
173 if (!strcmp (name, reg_defs[i].name))
174 return &reg_defs[i];
175 fatal ("Unknown register %s requested", name);
176 return 0;
177}
178
179int
180find_regno (const char *name)
181{
182 int i;
183
184 for (i = 0; i < num_registers; i++)
185 if (!strcmp (name, reg_defs[i].name))
186 return i;
187 fatal ("Unknown register %s requested", name);
188 return -1;
189}
190
191struct reg *
192find_register_by_number (int n)
193{
194 return &reg_defs[n];
195}
196
197int
198register_size (int n)
199{
200 return reg_defs[n].size / 8;
201}
202
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203static char *
204register_data (int n, int fetch)
0a30fbc4 205{
0d62e5e8 206 char *registers = get_regcache (current_inferior, fetch)->registers;
c04a1aa8 207
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208 return registers + (reg_defs[n].offset / 8);
209}
210
58caa3dc 211void
0729219d 212supply_register (int n, const void *buf)
58caa3dc 213{
0d62e5e8 214 memcpy (register_data (n, 0), buf, register_size (n));
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215}
216
217void
0729219d 218supply_register_by_name (const char *name, const void *buf)
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219{
220 supply_register (find_regno (name), buf);
221}
222
223void
0729219d 224collect_register (int n, void *buf)
58caa3dc 225{
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226 memcpy (buf, register_data (n, 1), register_size (n));
227}
228
229void
230collect_register_as_string (int n, char *buf)
231{
232 convert_int_to_ascii (register_data (n, 1), buf, register_size (n));
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233}
234
235void
0729219d 236collect_register_by_name (const char *name, void *buf)
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237{
238 collect_register (find_regno (name), buf);
239}
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