1 /* User visible, per-frame registers, for GDB, the GNU debugger.
3 Copyright (C) 2002-2014 Free Software Foundation, Inc.
5 Contributed by Red Hat.
7 This file is part of GDB.
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.
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.
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/>. */
23 #include "user-regs.h"
28 /* A table of user registers.
30 User registers have regnum's that live above of the range [0
31 .. gdbarch_num_regs + gdbarch_num_pseudo_regs)
32 (which is controlled by the target).
33 The target should never see a user register's regnum value.
35 Always append, never delete. By doing this, the relative regnum
36 (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs)
37 assigned to each user register never changes. */
42 struct value
*(*read
) (struct frame_info
* frame
, const void *baton
);
44 struct user_reg
*next
;
47 /* This structure is named gdb_user_regs instead of user_regs to avoid
48 conflicts with any "struct user_regs" in system headers. For instance,
49 on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes
50 <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which
51 declares "struct user_regs". */
55 struct user_reg
*first
;
56 struct user_reg
**last
;
60 append_user_reg (struct gdb_user_regs
*regs
, const char *name
,
61 user_reg_read_ftype
*read
, const void *baton
,
64 /* The caller is responsible for allocating memory needed to store
65 the register. By doing this, the function can operate on a
66 register list stored in the common heap or a specific obstack. */
67 gdb_assert (reg
!= NULL
);
73 regs
->last
= &(*regs
->last
)->next
;
76 /* An array of the builtin user registers. */
78 static struct gdb_user_regs builtin_user_regs
= {
79 NULL
, &builtin_user_regs
.first
83 user_reg_add_builtin (const char *name
, user_reg_read_ftype
*read
,
86 append_user_reg (&builtin_user_regs
, name
, read
, baton
,
87 XNEW (struct user_reg
));
90 /* Per-architecture user registers. Start with the builtin user
91 registers and then, again, append. */
93 static struct gdbarch_data
*user_regs_data
;
96 user_regs_init (struct gdbarch
*gdbarch
)
99 struct gdb_user_regs
*regs
100 = GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct gdb_user_regs
);
102 regs
->last
= ®s
->first
;
103 for (reg
= builtin_user_regs
.first
; reg
!= NULL
; reg
= reg
->next
)
104 append_user_reg (regs
, reg
->name
, reg
->read
, reg
->baton
,
105 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
110 user_reg_add (struct gdbarch
*gdbarch
, const char *name
,
111 user_reg_read_ftype
*read
, const void *baton
)
113 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
117 /* ULGH, called during architecture initialization. Patch
119 regs
= user_regs_init (gdbarch
);
120 deprecated_set_gdbarch_data (gdbarch
, user_regs_data
, regs
);
122 append_user_reg (regs
, name
, read
, baton
,
123 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
127 user_reg_map_name_to_regnum (struct gdbarch
*gdbarch
, const char *name
,
130 /* Make life easy, set the len to something reasonable. */
134 /* Search register name space first - always let an architecture
135 specific register override the user registers. */
138 int maxregs
= (gdbarch_num_regs (gdbarch
)
139 + gdbarch_num_pseudo_regs (gdbarch
));
141 for (i
= 0; i
< maxregs
; i
++)
143 const char *regname
= gdbarch_register_name (gdbarch
, i
);
145 if (regname
!= NULL
&& len
== strlen (regname
)
146 && strncmp (regname
, name
, len
) == 0)
153 /* Search the user name space. */
155 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
156 struct user_reg
*reg
;
159 for (nr
= 0, reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
, nr
++)
161 if ((len
< 0 && strcmp (reg
->name
, name
))
162 || (len
== strlen (reg
->name
)
163 && strncmp (reg
->name
, name
, len
) == 0))
164 return gdbarch_num_regs (gdbarch
)
165 + gdbarch_num_pseudo_regs (gdbarch
) + nr
;
172 static struct user_reg
*
173 usernum_to_user_reg (struct gdbarch
*gdbarch
, int usernum
)
175 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
176 struct user_reg
*reg
;
178 for (reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
)
188 user_reg_map_regnum_to_name (struct gdbarch
*gdbarch
, int regnum
)
190 int maxregs
= (gdbarch_num_regs (gdbarch
)
191 + gdbarch_num_pseudo_regs (gdbarch
));
195 else if (regnum
< maxregs
)
196 return gdbarch_register_name (gdbarch
, regnum
);
199 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
208 value_of_user_reg (int regnum
, struct frame_info
*frame
)
210 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
211 int maxregs
= (gdbarch_num_regs (gdbarch
)
212 + gdbarch_num_pseudo_regs (gdbarch
));
213 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
215 gdb_assert (reg
!= NULL
);
216 return reg
->read (frame
, reg
->baton
);
219 extern initialize_file_ftype _initialize_user_regs
; /* -Wmissing-prototypes */
222 _initialize_user_regs (void)
224 user_regs_data
= gdbarch_data_register_post_init (user_regs_init
);