| /* Builtin frame register, for GDB, the GNU debugger. |
| |
| Copyright (C) 2002, 2005, 2007-2012 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); |
| } |