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/* Builtin frame register, for GDB, the GNU debugger.
Copyright (C) 2002-2020 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 "frame.h"
#include "gdbtypes.h"
#include "value.h"
#include "gdbarch.h"
static struct value *
value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0)
/* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the
register name table overrides this built-in $fp register, there
is no real reason for this gdbarch_deprecated_fp_regnum trickery here.
An architecture wanting to implement "$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 (gdbarch_deprecated_fp_regnum (gdbarch),
frame);
else
{
struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr;
struct value *val = allocate_value (data_ptr_type);
gdb_byte *buf = value_contents_raw (val);
gdbarch_address_to_pointer (gdbarch, data_ptr_type,
buf, get_frame_base_address (frame));
return val;
}
}
static struct value *
value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
if (gdbarch_pc_regnum (gdbarch) >= 0)
return value_of_register (gdbarch_pc_regnum (gdbarch), frame);
else
{
struct type *func_ptr_type = builtin_type (gdbarch)->builtin_func_ptr;
struct value *val = allocate_value (func_ptr_type);
gdb_byte *buf = value_contents_raw (val);
gdbarch_address_to_pointer (gdbarch, func_ptr_type,
buf, get_frame_pc (frame));
return val;
}
}
static struct value *
value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
if (gdbarch_sp_regnum (gdbarch) >= 0)
return value_of_register (gdbarch_sp_regnum (gdbarch), frame);
error (_("Standard register ``$sp'' is not available for this target"));
}
static struct value *
value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton)
{
struct gdbarch *gdbarch = get_frame_arch (frame);
if (gdbarch_ps_regnum (gdbarch) >= 0)
return value_of_register (gdbarch_ps_regnum (gdbarch), frame);
error (_("Standard register ``$ps'' is not available for this target"));
}
void
_initialize_frame_reg (void)
{
/* 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);
}
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