251 lines
7 KiB
C
251 lines
7 KiB
C
/* User visible, per-frame registers, for GDB, the GNU debugger.
|
|
|
|
Copyright (C) 2002-2016 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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include "defs.h"
|
|
#include "user-regs.h"
|
|
#include "gdbtypes.h"
|
|
#include "frame.h"
|
|
#include "arch-utils.h"
|
|
#include "command.h"
|
|
#include "cli/cli-cmds.h"
|
|
|
|
/* A table of user registers.
|
|
|
|
User registers have regnum's that live above of the range [0
|
|
.. gdbarch_num_regs + gdbarch_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 gdbarch_num_regs + gdbarch_num_pseudo_regs)
|
|
assigned to each user register never changes. */
|
|
|
|
struct user_reg
|
|
{
|
|
const char *name;
|
|
struct value *(*read) (struct frame_info * frame, const void *baton);
|
|
const void *baton;
|
|
struct user_reg *next;
|
|
};
|
|
|
|
/* This structure is named gdb_user_regs instead of user_regs to avoid
|
|
conflicts with any "struct user_regs" in system headers. For instance,
|
|
on ARM GNU/Linux native builds, nm-linux.h includes <signal.h> includes
|
|
<sys/ucontext.h> includes <sys/procfs.h> includes <sys/user.h>, which
|
|
declares "struct user_regs". */
|
|
|
|
struct gdb_user_regs
|
|
{
|
|
struct user_reg *first;
|
|
struct user_reg **last;
|
|
};
|
|
|
|
static void
|
|
append_user_reg (struct gdb_user_regs *regs, const char *name,
|
|
user_reg_read_ftype *read, const void *baton,
|
|
struct user_reg *reg)
|
|
{
|
|
/* The caller is responsible for allocating memory needed to store
|
|
the register. By doing this, the function can operate on a
|
|
register list stored in the common heap or a specific obstack. */
|
|
gdb_assert (reg != NULL);
|
|
reg->name = name;
|
|
reg->read = read;
|
|
reg->baton = baton;
|
|
reg->next = NULL;
|
|
(*regs->last) = reg;
|
|
regs->last = &(*regs->last)->next;
|
|
}
|
|
|
|
/* An array of the builtin user registers. */
|
|
|
|
static struct gdb_user_regs builtin_user_regs = {
|
|
NULL, &builtin_user_regs.first
|
|
};
|
|
|
|
void
|
|
user_reg_add_builtin (const char *name, user_reg_read_ftype *read,
|
|
const void *baton)
|
|
{
|
|
append_user_reg (&builtin_user_regs, name, read, baton,
|
|
XNEW (struct user_reg));
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
struct user_reg *reg;
|
|
struct gdb_user_regs *regs
|
|
= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct gdb_user_regs);
|
|
|
|
regs->last = ®s->first;
|
|
for (reg = builtin_user_regs.first; reg != NULL; reg = reg->next)
|
|
append_user_reg (regs, reg->name, reg->read, reg->baton,
|
|
GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
|
|
return regs;
|
|
}
|
|
|
|
void
|
|
user_reg_add (struct gdbarch *gdbarch, const char *name,
|
|
user_reg_read_ftype *read, const void *baton)
|
|
{
|
|
struct gdb_user_regs *regs
|
|
= (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data);
|
|
|
|
if (regs == NULL)
|
|
{
|
|
/* ULGH, called during architecture initialization. Patch
|
|
things up. */
|
|
regs = (struct gdb_user_regs *) user_regs_init (gdbarch);
|
|
deprecated_set_gdbarch_data (gdbarch, user_regs_data, regs);
|
|
}
|
|
append_user_reg (regs, name, read, baton,
|
|
GDBARCH_OBSTACK_ZALLOC (gdbarch, struct user_reg));
|
|
}
|
|
|
|
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 gdb_user_regs *regs
|
|
= (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data);
|
|
struct user_reg *reg;
|
|
int nr;
|
|
|
|
for (nr = 0, reg = regs->first; reg != NULL; reg = reg->next, nr++)
|
|
{
|
|
if ((len < 0 && strcmp (reg->name, name))
|
|
|| (len == strlen (reg->name)
|
|
&& strncmp (reg->name, name, len) == 0))
|
|
return gdbarch_num_regs (gdbarch)
|
|
+ gdbarch_num_pseudo_regs (gdbarch) + nr;
|
|
}
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static struct user_reg *
|
|
usernum_to_user_reg (struct gdbarch *gdbarch, int usernum)
|
|
{
|
|
struct gdb_user_regs *regs
|
|
= (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data);
|
|
struct user_reg *reg;
|
|
|
|
for (reg = regs->first; reg != NULL; reg = reg->next)
|
|
{
|
|
if (usernum == 0)
|
|
return reg;
|
|
usernum--;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const char *
|
|
user_reg_map_regnum_to_name (struct gdbarch *gdbarch, int regnum)
|
|
{
|
|
int maxregs = (gdbarch_num_regs (gdbarch)
|
|
+ gdbarch_num_pseudo_regs (gdbarch));
|
|
|
|
if (regnum < 0)
|
|
return NULL;
|
|
else if (regnum < maxregs)
|
|
return gdbarch_register_name (gdbarch, regnum);
|
|
else
|
|
{
|
|
struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
|
|
if (reg == NULL)
|
|
return NULL;
|
|
else
|
|
return reg->name;
|
|
}
|
|
}
|
|
|
|
struct value *
|
|
value_of_user_reg (int regnum, struct frame_info *frame)
|
|
{
|
|
struct gdbarch *gdbarch = get_frame_arch (frame);
|
|
int maxregs = (gdbarch_num_regs (gdbarch)
|
|
+ gdbarch_num_pseudo_regs (gdbarch));
|
|
struct user_reg *reg = usernum_to_user_reg (gdbarch, regnum - maxregs);
|
|
|
|
gdb_assert (reg != NULL);
|
|
return reg->read (frame, reg->baton);
|
|
}
|
|
|
|
static void
|
|
maintenance_print_user_registers (char *args, int from_tty)
|
|
{
|
|
struct gdbarch *gdbarch = get_current_arch ();
|
|
struct gdb_user_regs *regs;
|
|
struct user_reg *reg;
|
|
int regnum;
|
|
|
|
regs = (struct gdb_user_regs *) gdbarch_data (gdbarch, user_regs_data);
|
|
regnum = gdbarch_num_regs (gdbarch) + gdbarch_num_pseudo_regs (gdbarch);
|
|
|
|
fprintf_unfiltered (gdb_stdout, " %-11s %3s\n", "Name", "Nr");
|
|
for (reg = regs->first; reg != NULL; reg = reg->next, ++regnum)
|
|
fprintf_unfiltered (gdb_stdout, " %-11s %3d\n", reg->name, regnum);
|
|
}
|
|
|
|
extern initialize_file_ftype _initialize_user_regs; /* -Wmissing-prototypes */
|
|
|
|
void
|
|
_initialize_user_regs (void)
|
|
{
|
|
user_regs_data = gdbarch_data_register_post_init (user_regs_init);
|
|
|
|
add_cmd ("user-registers", class_maintenance,
|
|
maintenance_print_user_registers,
|
|
_("List the names of the current user registers.\n"),
|
|
&maintenanceprintlist);
|
|
}
|