1 /* User visible, per-frame registers, for GDB, the GNU debugger.
3 Copyright 2002 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., 59 Temple Place - Suite 330,
22 Boston, MA 02111-1307, 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 .. NUM_REGS + NUM_PSEUDO_REGS) (which is controlled by the target).
35 The target should never see a user register's regnum value.
37 Always append, never delete. By doing this, the relative regnum
38 (offset from NUM_REGS + NUM_PSEUDO_REGS) assigned to each user
39 register never changes. */
44 struct value
*(*read
) (struct frame_info
* frame
);
45 struct user_reg
*next
;
50 struct user_reg
*first
;
51 struct user_reg
**last
;
55 append_user_reg (struct user_regs
*regs
, const char *name
,
56 user_reg_read_ftype
*read
, struct user_reg
*reg
)
58 /* The caller is responsible for allocating memory needed to store
59 the register. By doing this, the function can operate on a
60 register list stored in the common heap or a specific obstack. */
61 gdb_assert (reg
!= NULL
);
66 regs
->last
= &(*regs
->last
)->next
;
69 /* An array of the builtin user registers. */
71 static struct user_regs builtin_user_regs
= { NULL
, &builtin_user_regs
.first
};
74 user_reg_add_builtin (const char *name
, user_reg_read_ftype
*read
)
76 append_user_reg (&builtin_user_regs
, name
, read
,
77 XMALLOC (struct user_reg
));
80 /* Per-architecture user registers. Start with the builtin user
81 registers and then, again, append. */
83 static struct gdbarch_data
*user_regs_data
;
86 user_regs_init (struct gdbarch
*gdbarch
)
89 struct user_regs
*regs
= GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_regs
);
90 regs
->last
= ®s
->first
;
91 for (reg
= builtin_user_regs
.first
; reg
!= NULL
; reg
= reg
->next
)
92 append_user_reg (regs
, reg
->name
, reg
->read
,
93 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
98 user_reg_add (struct gdbarch
*gdbarch
, const char *name
,
99 user_reg_read_ftype
*read
)
101 struct user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
104 /* ULGH, called during architecture initialization. Patch
106 regs
= user_regs_init (gdbarch
);
107 set_gdbarch_data (gdbarch
, user_regs_data
, regs
);
109 append_user_reg (regs
, name
, read
,
110 GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct user_reg
));
114 user_reg_map_name_to_regnum (struct gdbarch
*gdbarch
, const char *name
,
117 /* Make life easy, set the len to something reasonable. */
121 /* Search register name space first - always let an architecture
122 specific register override the user registers. */
125 int maxregs
= (gdbarch_num_regs (gdbarch
)
126 + gdbarch_num_pseudo_regs (gdbarch
));
127 for (i
= 0; i
< maxregs
; i
++)
129 const char *regname
= gdbarch_register_name (gdbarch
, i
);
130 if (regname
!= NULL
&& len
== strlen (regname
)
131 && strncmp (regname
, name
, len
) == 0)
138 /* Search the user name space. */
140 struct user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
141 struct user_reg
*reg
;
143 for (nr
= 0, reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
, nr
++)
145 if ((len
< 0 && strcmp (reg
->name
, name
))
146 || (len
== strlen (reg
->name
)
147 && strncmp (reg
->name
, name
, len
) == 0))
148 return NUM_REGS
+ NUM_PSEUDO_REGS
+ nr
;
155 static struct user_reg
*
156 usernum_to_user_reg (struct gdbarch
*gdbarch
, int usernum
)
158 struct user_regs
*regs
= gdbarch_data (gdbarch
, user_regs_data
);
159 struct user_reg
*reg
;
160 for (reg
= regs
->first
; reg
!= NULL
; reg
= reg
->next
)
170 user_reg_map_regnum_to_name (struct gdbarch
*gdbarch
, int regnum
)
172 int maxregs
= (gdbarch_num_regs (gdbarch
)
173 + gdbarch_num_pseudo_regs (gdbarch
));
176 else if (regnum
< maxregs
)
177 return gdbarch_register_name (gdbarch
, regnum
);
180 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
189 value_of_user_reg (int regnum
, struct frame_info
*frame
)
191 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
192 int maxregs
= (gdbarch_num_regs (gdbarch
)
193 + gdbarch_num_pseudo_regs (gdbarch
));
194 struct user_reg
*reg
= usernum_to_user_reg (gdbarch
, regnum
- maxregs
);
195 gdb_assert (reg
!= NULL
);
196 return reg
->read (frame
);
199 extern initialize_file_ftype _initialize_user_regs
; /* -Wmissing-prototypes */
202 _initialize_user_regs (void)
204 user_regs_data
= register_gdbarch_data (user_regs_init
);