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eb8bc282 AC |
1 | /* User visible, per-frame registers, for GDB, the GNU debugger. |
2 | ||
b811d2c2 | 3 | Copyright (C) 2002-2020 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 | 25 | #include "frame.h" |
f5b95c01 AA |
26 | #include "arch-utils.h" |
27 | #include "command.h" | |
28 | #include "cli/cli-cmds.h" | |
eb8bc282 AC |
29 | |
30 | /* A table of user registers. | |
31 | ||
32 | User registers have regnum's that live above of the range [0 | |
f57d151a UW |
33 | .. gdbarch_num_regs + gdbarch_num_pseudo_regs) |
34 | (which is controlled by the target). | |
eb8bc282 AC |
35 | The target should never see a user register's regnum value. |
36 | ||
37 | Always append, never delete. By doing this, the relative regnum | |
f57d151a UW |
38 | (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs) |
39 | assigned to each user register never changes. */ | |
eb8bc282 AC |
40 | |
41 | struct user_reg | |
42 | { | |
43 | const char *name; | |
5ccd2fb7 KR |
44 | /* Avoid the "read" symbol name as it conflicts with a preprocessor symbol |
45 | in the NetBSD header for Stack Smashing Protection, that wraps the read(2) | |
46 | syscall. */ | |
47 | struct value *(*xread) (struct frame_info * frame, const void *baton); | |
123dc839 | 48 | const void *baton; |
63022984 | 49 | struct user_reg *next; |
eb8bc282 AC |
50 | }; |
51 | ||
8b9740d8 DJ |
52 | /* This structure is named gdb_user_regs instead of user_regs to avoid |
53 | conflicts with any "struct user_regs" in system headers. For instance, | |
54 | on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes | |
55 | <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which | |
56 | declares "struct user_regs". */ | |
57 | ||
58 | struct gdb_user_regs | |
eb8bc282 | 59 | { |
63022984 AC |
60 | struct user_reg *first; |
61 | struct user_reg **last; | |
eb8bc282 AC |
62 | }; |
63 | ||
64 | static void | |
8b9740d8 | 65 | append_user_reg (struct gdb_user_regs *regs, const char *name, |
5ccd2fb7 | 66 | user_reg_read_ftype *xread, const void *baton, |
123dc839 | 67 | struct user_reg *reg) |
eb8bc282 | 68 | { |
63022984 AC |
69 | /* The caller is responsible for allocating memory needed to store |
70 | the register. By doing this, the function can operate on a | |
71 | register list stored in the common heap or a specific obstack. */ | |
72 | gdb_assert (reg != NULL); | |
73 | reg->name = name; | |
5ccd2fb7 | 74 | reg->xread = xread; |
123dc839 | 75 | reg->baton = baton; |
63022984 AC |
76 | reg->next = NULL; |
77 | (*regs->last) = reg; | |
78 | regs->last = &(*regs->last)->next; | |
eb8bc282 AC |
79 | } |
80 | ||
81 | /* An array of the builtin user registers. */ | |
82 | ||
3e43a32a MS |
83 | static struct gdb_user_regs builtin_user_regs = { |
84 | NULL, &builtin_user_regs.first | |
85 | }; | |
eb8bc282 AC |
86 | |
87 | void | |
5ccd2fb7 | 88 | user_reg_add_builtin (const char *name, user_reg_read_ftype *xread, |
123dc839 | 89 | const void *baton) |
eb8bc282 | 90 | { |
5ccd2fb7 | 91 | append_user_reg (&builtin_user_regs, name, xread, baton, |
70ba0933 | 92 | XNEW (struct user_reg)); |
eb8bc282 AC |
93 | } |
94 | ||
95 | /* Per-architecture user registers. Start with the builtin user | |
96 | registers and then, again, append. */ | |
97 | ||
98 | static struct gdbarch_data *user_regs_data; | |
99 | ||
100 | static void * | |
3bc98c0c | 101 | user_regs_init (struct obstack *obstack) |
eb8bc282 | 102 | { |
63022984 | 103 | struct user_reg *reg; |
3bc98c0c | 104 | struct gdb_user_regs *regs = OBSTACK_ZALLOC (obstack, struct gdb_user_regs); |
5d502164 | 105 | |
63022984 AC |
106 | regs->last = ®s->first; |
107 | for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next) | |
5ccd2fb7 | 108 | append_user_reg (regs, reg->name, reg->xread, reg->baton, |
3bc98c0c | 109 | OBSTACK_ZALLOC (obstack, struct user_reg)); |
eb8bc282 AC |
110 | return regs; |
111 | } | |
112 | ||
eb8bc282 AC |
113 | void |
114 | user_reg_add (struct gdbarch *gdbarch, const char *name, | |
5ccd2fb7 | 115 | user_reg_read_ftype *xread, const void *baton) |
eb8bc282 | 116 | { |
19ba03f4 SM |
117 | struct gdb_user_regs *regs |
118 | = (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data); | |
3bc98c0c | 119 | gdb_assert (regs != NULL); |
5ccd2fb7 | 120 | append_user_reg (regs, name, xread, baton, |
63022984 | 121 | GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg)); |
eb8bc282 AC |
122 | } |
123 | ||
124 | int | |
125 | user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name, | |
126 | int len) | |
127 | { | |
128 | /* Make life easy, set the len to something reasonable. */ | |
129 | if (len < 0) | |
130 | len = strlen (name); | |
131 | ||
132 | /* Search register name space first - always let an architecture | |
133 | specific register override the user registers. */ | |
134 | { | |
135 | int i; | |
f6efe3f8 | 136 | int maxregs = gdbarch_num_cooked_regs (gdbarch); |
5d502164 | 137 | |
eb8bc282 AC |
138 | for (i = 0; i < maxregs; i++) |
139 | { | |
140 | const char *regname = gdbarch_register_name (gdbarch, i); | |
5d502164 | 141 | |
eb8bc282 AC |
142 | if (regname != NULL && len == strlen (regname) |
143 | && strncmp (regname, name, len) == 0) | |
144 | { | |
145 | return i; | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | /* Search the user name space. */ | |
151 | { | |
19ba03f4 SM |
152 | struct gdb_user_regs *regs |
153 | = (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data); | |
63022984 AC |
154 | struct user_reg *reg; |
155 | int nr; | |
5d502164 | 156 | |
63022984 | 157 | for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++) |
eb8bc282 | 158 | { |
63022984 AC |
159 | if ((len < 0 && strcmp (reg->name, name)) |
160 | || (len == strlen (reg->name) | |
161 | && strncmp (reg->name, name, len) == 0)) | |
f6efe3f8 | 162 | return gdbarch_num_cooked_regs (gdbarch) + nr; |
eb8bc282 AC |
163 | } |
164 | } | |
165 | ||
166 | return -1; | |
167 | } | |
168 | ||
63022984 AC |
169 | static struct user_reg * |
170 | usernum_to_user_reg (struct gdbarch *gdbarch, int usernum) | |
171 | { | |
19ba03f4 SM |
172 | struct gdb_user_regs *regs |
173 | = (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data); | |
63022984 | 174 | struct user_reg *reg; |
5d502164 | 175 | |
63022984 AC |
176 | for (reg = regs->first; reg != NULL; reg = reg->next) |
177 | { | |
178 | if (usernum == 0) | |
179 | return reg; | |
180 | usernum--; | |
181 | } | |
182 | return NULL; | |
183 | } | |
184 | ||
eb8bc282 AC |
185 | const char * |
186 | user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum) | |
187 | { | |
f6efe3f8 | 188 | int maxregs = gdbarch_num_cooked_regs (gdbarch); |
5d502164 | 189 | |
eb8bc282 AC |
190 | if (regnum < 0) |
191 | return NULL; | |
63022984 | 192 | else if (regnum < maxregs) |
eb8bc282 | 193 | return gdbarch_register_name (gdbarch, regnum); |
63022984 AC |
194 | else |
195 | { | |
196 | struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); | |
197 | if (reg == NULL) | |
198 | return NULL; | |
199 | else | |
200 | return reg->name; | |
201 | } | |
eb8bc282 AC |
202 | } |
203 | ||
204 | struct value * | |
205 | value_of_user_reg (int regnum, struct frame_info *frame) | |
206 | { | |
207 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
f6efe3f8 | 208 | int maxregs = gdbarch_num_cooked_regs (gdbarch); |
63022984 | 209 | struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs); |
5d502164 | 210 | |
63022984 | 211 | gdb_assert (reg != NULL); |
5ccd2fb7 | 212 | return reg->xread (frame, reg->baton); |
eb8bc282 AC |
213 | } |
214 | ||
f5b95c01 | 215 | static void |
4d4589ef | 216 | maintenance_print_user_registers (const char *args, int from_tty) |
f5b95c01 AA |
217 | { |
218 | struct gdbarch *gdbarch = get_current_arch (); | |
219 | struct gdb_user_regs *regs; | |
220 | struct user_reg *reg; | |
221 | int regnum; | |
222 | ||
19ba03f4 | 223 | regs = (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data); |
f6efe3f8 | 224 | regnum = gdbarch_num_cooked_regs (gdbarch); |
f5b95c01 | 225 | |
25dda427 | 226 | fprintf_unfiltered (gdb_stdout, " %-11s %3s\n", "Name", "Nr"); |
f5b95c01 | 227 | for (reg = regs->first; reg != NULL; reg = reg->next, ++regnum) |
25dda427 | 228 | fprintf_unfiltered (gdb_stdout, " %-11s %3d\n", reg->name, regnum); |
f5b95c01 AA |
229 | } |
230 | ||
6c265988 | 231 | void _initialize_user_regs (); |
eb8bc282 | 232 | void |
6c265988 | 233 | _initialize_user_regs () |
eb8bc282 | 234 | { |
3bc98c0c | 235 | user_regs_data = gdbarch_data_register_pre_init (user_regs_init); |
f5b95c01 AA |
236 | |
237 | add_cmd ("user-registers", class_maintenance, | |
238 | maintenance_print_user_registers, | |
89549d7f | 239 | _("List the names of the current user registers."), |
f5b95c01 | 240 | &maintenanceprintlist); |
eb8bc282 | 241 | } |