1 /* User visible, per-frame registers, for GDB, the GNU debugger.
3 Copyright (C) 2002, 2003, 2004, 2007 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 2 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, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor,
22 Boston, MA 02110-1301, USA. */
25 #include "user-regs.h"
27 #include "gdb_string.h"
28 #include "gdb_assert.h"
31 /* A table of user registers.
33 User registers have regnum's that live above of the range [0
34 .. gdbarch_num_regs + gdbarch_num_pseudo_regs)
35 (which is controlled by the target).
36 The target should never see a user register's regnum value.
38 Always append, never delete. By doing this, the relative regnum
39 (offset from gdbarch_num_regs + gdbarch_num_pseudo_regs)
40 assigned to each user register never changes. */
45 struct value
*(*read
) (struct frame_info
* frame
, const void *baton
);
47 struct user_reg
*next
;
50 /* This structure is named gdb_user_regs instead of user_regs to avoid
51 conflicts with any "struct user_regs" in system headers. For instance,
52 on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes
53 <sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which
54 declares "struct user_regs". */
58 struct user_reg
*first
;
59 struct user_reg
**last
;
63 append_user_reg (struct gdb_user_regs
*regs
, const char *name
,
64 user_reg_read_ftype
*read
, const void *baton
,
67 /* The caller is responsible for allocating memory needed to store
68 the register. By doing this, the function can operate on a
69 register list stored in the common heap or a specific obstack. */
70 gdb_assert (reg
!= NULL
);
76 regs
->last
= &(*regs
->last
)->next
;
79 /* An array of the builtin user registers. */
81 static struct gdb_user_regs builtin_user_regs
= { NULL
, &builtin_user_regs
.first
};
84 user_reg_add_builtin (const char *name
, user_reg_read_ftype
*read
,
87 append_user_reg (&builtin_user_regs
, name
, read
, baton
,
88 XMALLOC (struct user_reg
));
91 /* Per-architecture user registers. Start with the builtin user
92 registers and then, again, append. */
94 static struct gdbarch_data
*user_regs_data
;
97 user_regs_init (struct gdbarch
*gdbarch
)
100 struct gdb_user_regs
*regs
= GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct gdb_user_regs
);
101 regs
->last
= ®s
->first
;
102 for (reg
= builtin_user_regs
.first
; reg
!= NULL
; reg
= reg
->next
)
103 append_user_reg (regs
, reg
->name
, reg
->read
, reg
->baton
,
104 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
109 user_reg_add (struct gdbarch
*gdbarch
, const char *name
,
110 user_reg_read_ftype
*read
, const void *baton
)
112 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
115 /* ULGH, called during architecture initialization. Patch
117 regs
= user_regs_init (gdbarch
);
118 deprecated_set_gdbarch_data (gdbarch
, user_regs_data
, regs
);
120 append_user_reg (regs
, name
, read
, baton
,
121 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
125 user_reg_map_name_to_regnum (struct gdbarch
*gdbarch
, const char *name
,
128 /* Make life easy, set the len to something reasonable. */
132 /* Search register name space first - always let an architecture
133 specific register override the user registers. */
136 int maxregs
= (gdbarch_num_regs (gdbarch
)
137 + gdbarch_num_pseudo_regs (gdbarch
));
138 for (i
= 0; i
< maxregs
; i
++)
140 const char *regname
= gdbarch_register_name (gdbarch
, i
);
141 if (regname
!= NULL
&& len
== strlen (regname
)
142 && strncmp (regname
, name
, len
) == 0)
149 /* Search the user name space. */
151 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
152 struct user_reg
*reg
;
154 for (nr
= 0, reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
, nr
++)
156 if ((len
< 0 && strcmp (reg
->name
, name
))
157 || (len
== strlen (reg
->name
)
158 && strncmp (reg
->name
, name
, len
) == 0))
159 return gdbarch_num_regs (current_gdbarch
)
160 + gdbarch_num_pseudo_regs (current_gdbarch
) + nr
;
167 static struct user_reg
*
168 usernum_to_user_reg (struct gdbarch
*gdbarch
, int usernum
)
170 struct gdb_user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
171 struct user_reg
*reg
;
172 for (reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
)
182 user_reg_map_regnum_to_name (struct gdbarch
*gdbarch
, int regnum
)
184 int maxregs
= (gdbarch_num_regs (gdbarch
)
185 + gdbarch_num_pseudo_regs (gdbarch
));
188 else if (regnum
< maxregs
)
189 return gdbarch_register_name (gdbarch
, regnum
);
192 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
201 value_of_user_reg (int regnum
, struct frame_info
*frame
)
203 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
204 int maxregs
= (gdbarch_num_regs (gdbarch
)
205 + gdbarch_num_pseudo_regs (gdbarch
));
206 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
207 gdb_assert (reg
!= NULL
);
208 return reg
->read (frame
, reg
->baton
);
211 extern initialize_file_ftype _initialize_user_regs
; /* -Wmissing-prototypes */
214 _initialize_user_regs (void)
216 user_regs_data
= gdbarch_data_register_post_init (user_regs_init
);