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/* Builtin frame register, 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 "frame.h"
#include "gdbtypes.h"
#include "value.h"
#include "gdb_string.h"
/* Types that describe the various builtin registers. */
static struct type *builtin_type_frame_reg;
/* Constructors for those types. */
static void
build_builtin_type_frame_reg (void)
{
/* $frame. */
if (builtin_type_frame_reg == NULL)
{
#if 0
struct frame
{
void *base;
};
#endif
builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT);
append_composite_type_field (builtin_type_frame_reg, "base",
builtin_type_void_data_ptr);
}
}
static struct value *
value_of_builtin_frame_reg (struct frame_info *frame)
{
struct value *val;
char *buf;
build_builtin_type_frame_reg ();
val = allocate_value (builtin_type_frame_reg);
VALUE_LVAL (val) = not_lval;
buf = VALUE_CONTENTS_RAW (val);
memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);
/* frame.base. */
if (frame != NULL)
ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
get_frame_base (frame));
buf += TYPE_LENGTH (builtin_type_void_data_ptr);
/* frame.XXX. */
return val;
}
static struct value *
value_of_builtin_frame_fp_reg (struct frame_info *frame)
{
if (DEPRECATED_FP_REGNUM >= 0)
/* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
register name table overrides this built-in $fp register, there
is no real reason for this DEPRECATED_FP_REGNUM trickery here.
An architecture wanting to implement "$fp" as alias for a raw
register can do so by adding "fp" to register name table (mind
you, doing this is probably a dangerous thing). */
return value_of_register (DEPRECATED_FP_REGNUM, frame);
else
{
struct value *val = allocate_value (builtin_type_void_data_ptr);
char *buf = VALUE_CONTENTS_RAW (val);
if (frame == NULL)
memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);
else
ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
get_frame_base (frame));
return val;
}
}
static struct value *
value_of_builtin_frame_pc_reg (struct frame_info *frame)
{
if (PC_REGNUM >= 0)
return value_of_register (PC_REGNUM, frame);
else
{
struct value *val = allocate_value (builtin_type_void_data_ptr);
char *buf = VALUE_CONTENTS_RAW (val);
if (frame == NULL)
memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0);
else
ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf,
get_frame_pc (frame));
return val;
}
}
static struct value *
value_of_builtin_frame_sp_reg (struct frame_info *frame)
{
#ifdef SP_REGNUM
if (SP_REGNUM >= 0)
return value_of_register (SP_REGNUM, frame);
#endif
error ("Standard register ``$sp'' is not available for this target");
}
static struct value *
value_of_builtin_frame_ps_reg (struct frame_info *frame)
{
#ifdef PS_REGNUM
if (PS_REGNUM >= 0)
return value_of_register (PS_REGNUM, frame);
#endif
error ("Standard register ``$ps'' is not available for this target");
}
extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */
void
_initialize_frame_reg (void)
{
/* FIXME: cagney/2002-02-08: At present the local builtin types
can't be initialized using _initialize*() or gdbarch. Due mainly
to non-multi-arch targets, GDB initializes things piece meal and,
as a consequence can leave these types NULL. */
REGISTER_GDBARCH_SWAP (builtin_type_frame_reg);
/* Frame based $fp, $pc, $sp and $ps. These only come into play
when the target does not define its own version of these
registers. */
user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg);
user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg);
user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg);
user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg);
/* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe
/ $gdb.frame disabled. It isn't yet clear which of the many
options is the best. */
if (0)
user_reg_add_builtin ("frame", value_of_builtin_frame_reg);
}
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