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, NULL);