Upgrade GDB from 7.4.1 to 7.6.1 on the vendor branch
[dragonfly.git] / contrib / gdb-7 / gdb / user-regs.c
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1/* User visible, per-frame registers, for GDB, the GNU debugger.
2
ef5ccd6c 3 Copyright (C) 2002-2013 Free Software Foundation, Inc.
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4
5 Contributed by Red Hat.
6
7 This file is part of GDB.
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21
22#include "defs.h"
23#include "user-regs.h"
24#include "gdbtypes.h"
25#include "gdb_string.h"
26#include "gdb_assert.h"
27#include "frame.h"
28
29/* A table of user registers.
30
31 User registers have regnum's that live above of the range [0
32 .. gdbarch_num_regs + gdbarch_num_pseudo_regs)
33 (which is controlled by the target).
34 The target should never see a user register's regnum value.
35
36 Always append, never delete. By doing this, the relative regnum
37 (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs)
38 assigned to each user register never changes. */
39
40struct user_reg
41{
42 const char *name;
43 struct value *(*read) (struct frame_info * frame, const void *baton);
44 const void *baton;
45 struct user_reg *next;
46};
47
48/* This structure is named gdb_user_regs instead of user_regs to avoid
49 conflicts with any "struct user_regs" in system headers. For instance,
50 on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes
51 <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which
52 declares "struct user_regs". */
53
54struct gdb_user_regs
55{
56 struct user_reg *first;
57 struct user_reg **last;
58};
59
60static void
61append_user_reg (struct gdb_user_regs *regs, const char *name,
62 user_reg_read_ftype *read, const void *baton,
63 struct user_reg *reg)
64{
65 /* The caller is responsible for allocating memory needed to store
66 the register. By doing this, the function can operate on a
67 register list stored in the common heap or a specific obstack. */
68 gdb_assert (reg != NULL);
69 reg->name = name;
70 reg->read = read;
71 reg->baton = baton;
72 reg->next = NULL;
73 (*regs->last) = reg;
74 regs->last = &(*regs->last)->next;
75}
76
77/* An array of the builtin user registers. */
78
c50c785c
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79static struct gdb_user_regs builtin_user_regs = {
80 NULL, &builtin_user_regs.first
81};
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82
83void
84user_reg_add_builtin (const char *name, user_reg_read_ftype *read,
85 const void *baton)
86{
87 append_user_reg (&builtin_user_regs, name, read, baton,
88 XMALLOC (struct user_reg));
89}
90
91/* Per-architecture user registers. Start with the builtin user
92 registers and then, again, append. */
93
94static struct gdbarch_data *user_regs_data;
95
96static void *
97user_regs_init (struct gdbarch *gdbarch)
98{
99 struct user_reg *reg;
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100 struct gdb_user_regs *regs
101 = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct gdb_user_regs);
102
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103 regs->last = &regs->first;
104 for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next)
105 append_user_reg (regs, reg->name, reg->read, reg->baton,
106 GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
107 return regs;
108}
109
110void
111user_reg_add (struct gdbarch *gdbarch, const char *name,
112 user_reg_read_ftype *read, const void *baton)
113{
114 struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
cf7f2e2d 115
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116 if (regs == NULL)
117 {
118 /* ULGH, called during architecture initialization. Patch
119 things up. */
120 regs = user_regs_init (gdbarch);
121 deprecated_set_gdbarch_data (gdbarch, user_regs_data, regs);
122 }
123 append_user_reg (regs, name, read, baton,
124 GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
125}
126
127int
128user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name,
129 int len)
130{
131 /* Make life easy, set the len to something reasonable. */
132 if (len < 0)
133 len = strlen (name);
134
135 /* Search register name space first - always let an architecture
136 specific register override the user registers. */
137 {
138 int i;
139 int maxregs = (gdbarch_num_regs (gdbarch)
140 + gdbarch_num_pseudo_regs (gdbarch));
cf7f2e2d 141
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142 for (i = 0; i < maxregs; i++)
143 {
144 const char *regname = gdbarch_register_name (gdbarch, i);
cf7f2e2d 145
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146 if (regname != NULL && len == strlen (regname)
147 && strncmp (regname, name, len) == 0)
148 {
149 return i;
150 }
151 }
152 }
153
154 /* Search the user name space. */
155 {
156 struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
157 struct user_reg *reg;
158 int nr;
cf7f2e2d 159
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160 for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++)
161 {
162 if ((len < 0 && strcmp (reg->name, name))
163 || (len == strlen (reg->name)
164 && strncmp (reg->name, name, len) == 0))
165 return gdbarch_num_regs (gdbarch)
166 + gdbarch_num_pseudo_regs (gdbarch) + nr;
167 }
168 }
169
170 return -1;
171}
172
173static struct user_reg *
174usernum_to_user_reg (struct gdbarch *gdbarch, int usernum)
175{
176 struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
177 struct user_reg *reg;
cf7f2e2d 178
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179 for (reg = regs->first; reg != NULL; reg = reg->next)
180 {
181 if (usernum == 0)
182 return reg;
183 usernum--;
184 }
185 return NULL;
186}
187
188const char *
189user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum)
190{
191 int maxregs = (gdbarch_num_regs (gdbarch)
192 + gdbarch_num_pseudo_regs (gdbarch));
cf7f2e2d 193
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194 if (regnum < 0)
195 return NULL;
196 else if (regnum < maxregs)
197 return gdbarch_register_name (gdbarch, regnum);
198 else
199 {
200 struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
201 if (reg == NULL)
202 return NULL;
203 else
204 return reg->name;
205 }
206}
207
208struct value *
209value_of_user_reg (int regnum, struct frame_info *frame)
210{
211 struct gdbarch *gdbarch = get_frame_arch (frame);
212 int maxregs = (gdbarch_num_regs (gdbarch)
213 + gdbarch_num_pseudo_regs (gdbarch));
214 struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
cf7f2e2d 215
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216 gdb_assert (reg != NULL);
217 return reg->read (frame, reg->baton);
218}
219
220extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */
221
222void
223_initialize_user_regs (void)
224{
225 user_regs_data = gdbarch_data_register_post_init (user_regs_init);
226}