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/* Builtin frame register, for GDB, the GNU debugger.
Copyright (C) 2002, 2005, 2007 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, 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, const void *baton)
{
struct value *val;
gdb_byte *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, 0, TYPE_LENGTH (value_type (val)));
/* frame.base. */
if (frame != NULL)
gdbarch_address_to_pointer (current_gdbarch, 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, const void *baton)
{
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);
gdb_byte *buf = value_contents_raw (val);
if (frame == NULL)
memset (buf, 0, TYPE_LENGTH (value_type (val)));
else
gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr,
buf, get_frame_base_address (frame));
return val;
}
}
static struct value *
value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton)
{
if (PC_REGNUM >= 0)
return value_of_register (PC_REGNUM, frame);
else
{
struct value *val = allocate_value (builtin_type_void_data_ptr);
gdb_byte *buf = value_contents_raw (val);
if (frame == NULL)
memset (buf, 0, TYPE_LENGTH (value_type (val)));
else
gdbarch_address_to_pointer (current_gdbarch, 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, const void *baton)
{
#ifdef SP_REGNUM
if (SP_REGNUM >= 0)
return value_of_register (SP_REGNUM, frame);
#endif
error (_("Standard register ``$sp'' is not available for this target"));
}
static struct value *
value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
{
#ifdef PS_REGNUM
if (PS_REGNUM >= 0)
return value_of_register (PS_REGNUM, frame);
#endif
error (_("Standard register ``$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. */
DEPRECATED_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, NULL);
user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg, NULL);
user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg, NULL);
user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg, NULL);
/* 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, NULL);
}
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