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eb8bc282 AC |
1 | /* User visible, per-frame registers, for GDB, the GNU debugger. |
2 | ||
ecd75fc8 | 3 | Copyright (C) 2002-2014 Free Software Foundation, Inc. |
eb8bc282 AC |
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
eb8bc282 AC |
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 | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
eb8bc282 AC |
21 | |
22 | #include "defs.h" | |
23 | #include "user-regs.h" | |
24 | #include "gdbtypes.h" | |
eb8bc282 AC |
25 | #include "frame.h" |
26 | ||
27 | /* A table of user registers. | |
28 | ||
29 | User registers have regnum's that live above of the range [0 | |
f57d151a UW |
30 | .. gdbarch_num_regs + gdbarch_num_pseudo_regs) |
31 | (which is controlled by the target). | |
eb8bc282 AC |
32 | The target should never see a user register's regnum value. |
33 | ||
34 | Always append, never delete. By doing this, the relative regnum | |
f57d151a UW |
35 | (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs) |
36 | assigned to each user register never changes. */ | |
eb8bc282 AC |
37 | |
38 | struct user_reg | |
39 | { | |
40 | const char *name; | |
123dc839 DJ |
41 | struct value *(*read) (struct frame_info * frame, const void *baton); |
42 | const void *baton; | |
63022984 | 43 | struct user_reg *next; |
eb8bc282 AC |
44 | }; |
45 | ||
8b9740d8 DJ |
46 | /* This structure is named gdb_user_regs instead of user_regs to avoid |
47 | conflicts with any "struct user_regs" in system headers. For instance, | |
48 | on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes | |
49 | <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which | |
50 | declares "struct user_regs". */ | |
51 | ||
52 | struct gdb_user_regs | |
eb8bc282 | 53 | { |
63022984 AC |
54 | struct user_reg *first; |
55 | struct user_reg **last; | |
eb8bc282 AC |
56 | }; |
57 | ||
58 | static void | |
8b9740d8 | 59 | append_user_reg (struct gdb_user_regs *regs, const char *name, |
123dc839 DJ |
60 | user_reg_read_ftype *read, const void *baton, |
61 | struct user_reg *reg) | |
eb8bc282 | 62 | { |
63022984 AC |
63 | /* The caller is responsible for allocating memory needed to store |
64 | the register. By doing this, the function can operate on a | |
65 | register list stored in the common heap or a specific obstack. */ | |
66 | gdb_assert (reg != NULL); | |
67 | reg->name = name; | |
68 | reg->read = read; | |
123dc839 | 69 | reg->baton = baton; |
63022984 AC |
70 | reg->next = NULL; |
71 | (*regs->last) = reg; | |
72 | regs->last = &(*regs->last)->next; | |
eb8bc282 AC |
73 | } |
74 | ||
75 | /* An array of the builtin user registers. */ | |
76 | ||
3e43a32a MS |
77 | static struct gdb_user_regs builtin_user_regs = { |
78 | NULL, &builtin_user_regs.first | |
79 | }; | |
eb8bc282 AC |
80 | |
81 | void | |
123dc839 DJ |
82 | user_reg_add_builtin (const char *name, user_reg_read_ftype *read, |
83 | const void *baton) | |
eb8bc282 | 84 | { |
123dc839 | 85 | append_user_reg (&builtin_user_regs, name, read, baton, |
70ba0933 | 86 | XNEW (struct user_reg)); |
eb8bc282 AC |
87 | } |
88 | ||
89 | /* Per-architecture user registers. Start with the builtin user | |
90 | registers and then, again, append. */ | |
91 | ||
92 | static struct gdbarch_data *user_regs_data; | |
93 | ||
94 | static void * | |
95 | user_regs_init (struct gdbarch *gdbarch) | |
96 | { | |
63022984 | 97 | struct user_reg *reg; |
5d502164 MS |
98 | struct gdb_user_regs *regs |
99 | = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct gdb_user_regs); | |
100 | ||
63022984 AC |
101 | regs->last = ®s->first; |
102 | for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next) | |
123dc839 | 103 | append_user_reg (regs, reg->name, reg->read, reg->baton, |
63022984 | 104 | GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg)); |
eb8bc282 AC |
105 | return regs; |
106 | } | |
107 | ||
eb8bc282 AC |
108 | void |
109 | user_reg_add (struct gdbarch *gdbarch, const char *name, | |
123dc839 | 110 | user_reg_read_ftype *read, const void *baton) |
eb8bc282 | 111 | { |
8b9740d8 | 112 | struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data); |
5d502164 | 113 | |
eb8bc282 AC |
114 | if (regs == NULL) |
115 | { | |
116 | /* ULGH, called during architecture initialization. Patch | |
117 | things up. */ | |
118 | regs = user_regs_init (gdbarch); | |
030f20e1 | 119 | deprecated_set_gdbarch_data (gdbarch, user_regs_data, regs); |
eb8bc282 | 120 | } |
123dc839 | 121 | append_user_reg (regs, name, read, baton, |
63022984 | 122 | GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg)); |
eb8bc282 AC |
123 | } |
124 | ||
125 | int | |
126 | user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name, | |
127 | int len) | |
128 | { | |
129 | /* Make life easy, set the len to something reasonable. */ | |
130 | if (len < 0) | |
131 | len = strlen (name); | |
132 | ||
133 | /* Search register name space first - always let an architecture | |
134 | specific register override the user registers. */ | |
135 | { | |
136 | int i; | |
137 | int maxregs = (gdbarch_num_regs (gdbarch) | |
138 | + gdbarch_num_pseudo_regs (gdbarch)); | |
5d502164 | 139 | |
eb8bc282 AC |
140 | for (i = 0; i < maxregs; i++) |
141 | { | |
142 | const char *regname = gdbarch_register_name (gdbarch, i); | |
5d502164 | 143 | |
eb8bc282 AC |
144 | if (regname != NULL && len == strlen (regname) |
145 | && strncmp (regname, name, len) == 0) | |
146 | { | |
147 | return i; | |
148 | } | |
149 | } | |
150 | } | |
151 | ||
152 | /* Search the user name space. */ | |
153 | { | |
8b9740d8 | 154 | struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data); |
63022984 AC |
155 | struct user_reg *reg; |
156 | int nr; | |
5d502164 | 157 | |
63022984 | 158 | for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++) |
eb8bc282 | 159 | { |
63022984 AC |
160 | if ((len < 0 && strcmp (reg->name, name)) |
161 | || (len == strlen (reg->name) | |
162 | && strncmp (reg->name, name, len) == 0)) | |
40a6adc1 MD |
163 | return gdbarch_num_regs (gdbarch) |
164 | + gdbarch_num_pseudo_regs (gdbarch) + nr; | |
eb8bc282 AC |
165 | } |
166 | } | |
167 | ||
168 | return -1; | |
169 | } | |
170 | ||
63022984 AC |
171 | static struct user_reg * |
172 | usernum_to_user_reg (struct gdbarch *gdbarch, int usernum) | |
173 | { | |
8b9740d8 | 174 | struct gdb_user_regs *regs = gdbarch_data (gdbarch, user_regs_data); |
63022984 | 175 | struct user_reg *reg; |
5d502164 | 176 | |
63022984 AC |
177 | for (reg = regs->first; reg != NULL; reg = reg->next) |
178 | { | |
179 | if (usernum == 0) | |
180 | return reg; | |
181 | usernum--; | |
182 | } | |
183 | return NULL; | |
184 | } | |
185 | ||
eb8bc282 AC |
186 | const char * |
187 | user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum) | |
188 | { | |
189 | int maxregs = (gdbarch_num_regs (gdbarch) | |
190 | + gdbarch_num_pseudo_regs (gdbarch)); | |
5d502164 | 191 | |
eb8bc282 AC |
192 | if (regnum < 0) |
193 | return NULL; | |
63022984 | 194 | else if (regnum < maxregs) |
eb8bc282 | 195 | return gdbarch_register_name (gdbarch, regnum); |
63022984 AC |
196 | else |
197 | { | |
198 | struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); | |
199 | if (reg == NULL) | |
200 | return NULL; | |
201 | else | |
202 | return reg->name; | |
203 | } | |
eb8bc282 AC |
204 | } |
205 | ||
206 | struct value * | |
207 | value_of_user_reg (int regnum, struct frame_info *frame) | |
208 | { | |
209 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
63022984 AC |
210 | int maxregs = (gdbarch_num_regs (gdbarch) |
211 | + gdbarch_num_pseudo_regs (gdbarch)); | |
212 | struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); | |
5d502164 | 213 | |
63022984 | 214 | gdb_assert (reg != NULL); |
123dc839 | 215 | return reg->read (frame, reg->baton); |
eb8bc282 AC |
216 | } |
217 | ||
218 | extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */ | |
219 | ||
220 | void | |
221 | _initialize_user_regs (void) | |
222 | { | |
030f20e1 | 223 | user_regs_data = gdbarch_data_register_post_init (user_regs_init); |
eb8bc282 | 224 | } |