/* Builtin frame register, for GDB, the GNU debugger. Copyright (C) 2002-2013 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 "gdb_string.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")); } extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */ 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); }