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/* User visible, per-frame registers, for GDB, the GNU debugger.
Copyright 2002 Free Software Foundation, Inc.
Contributed by Red Hat.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "defs.h"
#include "user-regs.h"
#include "gdbtypes.h"
#include "gdb_string.h"
#include "gdb_assert.h"
#include "frame.h"
/* A table of user registers.
User registers have regnum's that live above of the range [0
.. NUM_REGS + NUM_PSEUDO_REGS) (which is controlled by the target).
The target should never see a user register's regnum value.
Always append, never delete. By doing this, the relative regnum
(offset from NUM_REGS + NUM_PSEUDO_REGS) assigned to each user
register never changes. */
struct user_reg
{
const char *name;
struct value *(*read) (struct frame_info * frame);
};
struct user_regs
{
struct user_reg *user;
int nr;
};
static void
append_user_reg (struct user_regs *regs,
const char *name, user_reg_read_ftype *read)
{
regs->nr++;
regs->user = xrealloc (regs->user,
regs->nr * sizeof (struct user_reg));
regs->user[regs->nr - 1].name = name;
regs->user[regs->nr - 1].read = read;
}
/* An array of the builtin user registers. */
static struct user_regs builtin_user_regs;
void
user_reg_add_builtin (const char *name, user_reg_read_ftype *read)
{
append_user_reg (&builtin_user_regs, name, read);
}
/* Per-architecture user registers. Start with the builtin user
registers and then, again, append. */
static struct gdbarch_data *user_regs_data;
static void *
user_regs_init (struct gdbarch *gdbarch)
{
int i;
struct user_regs *regs = XMALLOC (struct user_regs);
memset (regs, 0, sizeof (struct user_regs));
for (i = 0; i < builtin_user_regs.nr; i++)
append_user_reg (regs, builtin_user_regs.user[i].name,
builtin_user_regs.user[i].read);
return regs;
}
static void
user_regs_free (struct gdbarch *gdbarch, void *data)
{
struct user_regs *regs = data;
xfree (regs->user);
xfree (regs);
}
void
user_reg_add (struct gdbarch *gdbarch, const char *name,
user_reg_read_ftype *read)
{
struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
if (regs == NULL)
{
/* ULGH, called during architecture initialization. Patch
things up. */
regs = user_regs_init (gdbarch);
set_gdbarch_data (gdbarch, user_regs_data, regs);
}
append_user_reg (regs, name, read);
}
int
user_reg_map_name_to_regnum (struct gdbarch *gdbarch, const char *name,
int len)
{
/* Make life easy, set the len to something reasonable. */
if (len < 0)
len = strlen (name);
/* Search register name space first - always let an architecture
specific register override the user registers. */
{
int i;
int maxregs = (gdbarch_num_regs (gdbarch)
+ gdbarch_num_pseudo_regs (gdbarch));
for (i = 0; i < maxregs; i++)
{
const char *regname = gdbarch_register_name (gdbarch, i);
if (regname != NULL && len == strlen (regname)
&& strncmp (regname, name, len) == 0)
{
return i;
}
}
}
/* Search the user name space. */
{
struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
int reg;
for (reg = 0; reg < regs->nr; reg++)
{
if ((len < 0 && strcmp (regs->user[reg].name, name))
|| (len == strlen (regs->user[reg].name)
&& strncmp (regs->user[reg].name, name, len) == 0))
return NUM_REGS + NUM_PSEUDO_REGS + reg;
}
}
return -1;
}
const char *
user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum)
{
int maxregs = (gdbarch_num_regs (gdbarch)
+ gdbarch_num_pseudo_regs (gdbarch));
struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
if (regnum < 0)
return NULL;
if (regnum < maxregs)
return gdbarch_register_name (gdbarch, regnum);
if (regnum < (maxregs + regs->nr))
return regs->user[regnum - maxregs].name;
return NULL;
}
struct value *
value_of_user_reg (int regnum, struct frame_info *frame)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
struct user_regs *regs = gdbarch_data (gdbarch, user_regs_data);
int reg = regnum - (NUM_REGS + NUM_PSEUDO_REGS);
gdb_assert (reg >= 0 && reg < regs->nr);
return regs->user[reg].read (frame);
}
extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */
void
_initialize_user_regs (void)
{
user_regs_data = register_gdbarch_data (user_regs_init, user_regs_free);
}
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