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);
49 struct user_reg *user;
54 append_user_reg (struct user_regs *regs,
55 const char *name, user_reg_read_ftype *read)
58 regs->user = xrealloc (regs->user,
59 regs->nr * sizeof (struct user_reg));
60 regs->user[regs->nr - 1].name = name;
61 regs->user[regs->nr - 1].read = read;
64 /* An array of the builtin user registers. */
66 static struct user_regs builtin_user_regs;
69 user_reg_add_builtin (const char *name, user_reg_read_ftype *read)
71 append_user_reg (&builtin_user_regs, name, read);
74 /* Per-architecture user registers. Start with the builtin user
75 registers and then, again, append. */
77 static struct gdbarch_data *user_regs_data;
80 user_regs_init (struct gdbarch *gdbarch)
83 struct user_regs *regs = XMALLOC (struct user_regs);
84 memset (regs, 0, sizeof (struct user_regs));
85 for (i = 0; i < builtin_user_regs.nr; i++)
86 append_user_reg (regs, builtin_user_regs.user[i].name,
87 builtin_user_regs.user[i].read);
92 user_regs_free (struct gdbarch *gdbarch, void *data)
94 struct user_regs *regs = data;
100 user_reg_add (struct gdbarch *gdbarch, const char *name,
101 user_reg_read_ftype *read)
103 struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
106 /* ULGH, called during architecture initialization. Patch
108 regs = user_regs_init (gdbarch);
109 set_gdbarch_data (gdbarch, user_regs_data, regs);
111 append_user_reg (regs, name, read);
115 user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name,
118 /* Make life easy, set the len to something reasonable. */
122 /* Search register name space first - always let an architecture
123 specific register override the user registers. */
126 int maxregs = (gdbarch_num_regs (gdbarch)
127 + gdbarch_num_pseudo_regs (gdbarch));
128 for (i = 0; i < maxregs; i++)
130 const char *regname = gdbarch_register_name (gdbarch, i);
131 if (regname != NULL && len == strlen (regname)
132 && strncmp (regname, name, len) == 0)
139 /* Search the user name space. */
141 struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
143 for (reg = 0; reg < regs->nr; reg++)
145 if ((len < 0 && strcmp (regs->user[reg].name, name))
146 || (len == strlen (regs->user[reg].name)
147 && strncmp (regs->user[reg].name, name, len) == 0))
148 return NUM_REGS + NUM_PSEUDO_REGS + reg;
156 user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum)
158 int maxregs = (gdbarch_num_regs (gdbarch)
159 + gdbarch_num_pseudo_regs (gdbarch));
160 struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
163 if (regnum < maxregs)
164 return gdbarch_register_name (gdbarch, regnum);
165 if (regnum < (maxregs + regs->nr))
166 return regs->user[regnum - maxregs].name;
171 value_of_user_reg (int regnum, struct frame_info *frame)
173 struct gdbarch *gdbarch = get_frame_arch (frame);
174 struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
175 int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);
176 gdb_assert (reg >= 0 && reg < regs->nr);
177 return regs->user[reg].read (frame);
180 extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */
183 _initialize_user_regs (void)
185 user_regs_data = register_gdbarch_data (user_regs_init, user_regs_free);