1/* Builtin frame register, for GDB, the GNU debugger. 2 3 Copyright (C) 2002, 2005, 2007 Free Software Foundation, Inc. 4 5 Contributed by Red Hat. 6 7 This file is part of GDB. 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 21 22#include "defs.h" 23#include "user-regs.h" 24#include "frame.h" 25#include "gdbtypes.h" 26#include "value.h" 27#include "gdb_string.h" 28 29 30static struct value * 31value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton) 32{ 33 if (gdbarch_deprecated_fp_regnum (current_gdbarch) >= 0) 34 /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the 35 register name table overrides this built-in $fp register, there 36 is no real reason for this gdbarch_deprecated_fp_regnum trickery here. 37 An architecture wanting to implement "$fp" as alias for a raw 38 register can do so by adding "fp" to register name table (mind 39 you, doing this is probably a dangerous thing). */ 40 return value_of_register (gdbarch_deprecated_fp_regnum (current_gdbarch), 41 frame); 42 else 43 { 44 struct value *val = allocate_value (builtin_type_void_data_ptr); 45 gdb_byte *buf = value_contents_raw (val); 46 if (frame == NULL) 47 memset (buf, 0, TYPE_LENGTH (value_type (val))); 48 else 49 gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr, 50 buf, get_frame_base_address (frame)); 51 return val; 52 } 53} 54 55static struct value * 56value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton) 57{ 58 if (gdbarch_pc_regnum (current_gdbarch) >= 0) 59 return value_of_register (gdbarch_pc_regnum (current_gdbarch), frame); 60 else 61 { 62 struct value *val = allocate_value (builtin_type_void_data_ptr); 63 gdb_byte *buf = value_contents_raw (val); 64 if (frame == NULL) 65 memset (buf, 0, TYPE_LENGTH (value_type (val))); 66 else 67 gdbarch_address_to_pointer (current_gdbarch, builtin_type_void_data_ptr, 68 buf, get_frame_pc (frame)); 69 return val; 70 } 71} 72 73static struct value * 74value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton) 75{ 76 if (gdbarch_sp_regnum (current_gdbarch) >= 0) 77 return value_of_register (gdbarch_sp_regnum (current_gdbarch), frame); 78 error (_("Standard register ``$sp'' is not available for this target")); 79} 80 81static struct value * 82value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton) 83{ 84 if (gdbarch_ps_regnum (current_gdbarch) >= 0) 85 return value_of_register (gdbarch_ps_regnum (current_gdbarch), frame); 86 error (_("Standard register ``$ps'' is not available for this target")); 87} 88 89extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */ 90 91void 92_initialize_frame_reg (void) 93{ 94 /* Frame based $fp, $pc, $sp and $ps. These only come into play 95 when the target does not define its own version of these 96 registers. */ 97 user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg, NULL); 98 user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg, NULL); 99 user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg, NULL); 100 user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg, NULL); 101} 102