| 1 | /* Builtin frame register, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 2002, 2005, 2007, 2008, 2009 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 | |
| 30 | static struct value * |
| 31 | value_of_builtin_frame_fp_reg (struct frame_info *frame, const void *baton) |
| 32 | { |
| 33 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 34 | if (gdbarch_deprecated_fp_regnum (gdbarch) >= 0) |
| 35 | /* NOTE: cagney/2003-04-24: Since the mere presence of "fp" in the |
| 36 | register name table overrides this built-in $fp register, there |
| 37 | is no real reason for this gdbarch_deprecated_fp_regnum trickery here. |
| 38 | An architecture wanting to implement "$fp" as alias for a raw |
| 39 | register can do so by adding "fp" to register name table (mind |
| 40 | you, doing this is probably a dangerous thing). */ |
| 41 | return value_of_register (gdbarch_deprecated_fp_regnum (gdbarch), |
| 42 | frame); |
| 43 | else |
| 44 | { |
| 45 | struct type *data_ptr_type = builtin_type (gdbarch)->builtin_data_ptr; |
| 46 | struct value *val = allocate_value (data_ptr_type); |
| 47 | gdb_byte *buf = value_contents_raw (val); |
| 48 | if (frame == NULL) |
| 49 | memset (buf, 0, TYPE_LENGTH (value_type (val))); |
| 50 | else |
| 51 | gdbarch_address_to_pointer (gdbarch, data_ptr_type, |
| 52 | buf, get_frame_base_address (frame)); |
| 53 | return val; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | static struct value * |
| 58 | value_of_builtin_frame_pc_reg (struct frame_info *frame, const void *baton) |
| 59 | { |
| 60 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 61 | if (gdbarch_pc_regnum (gdbarch) >= 0) |
| 62 | return value_of_register (gdbarch_pc_regnum (gdbarch), frame); |
| 63 | else |
| 64 | { |
| 65 | struct type *func_ptr_type = builtin_type (gdbarch)->builtin_func_ptr; |
| 66 | struct value *val = allocate_value (func_ptr_type); |
| 67 | gdb_byte *buf = value_contents_raw (val); |
| 68 | if (frame == NULL) |
| 69 | memset (buf, 0, TYPE_LENGTH (value_type (val))); |
| 70 | else |
| 71 | gdbarch_address_to_pointer (gdbarch, func_ptr_type, |
| 72 | buf, get_frame_pc (frame)); |
| 73 | return val; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static struct value * |
| 78 | value_of_builtin_frame_sp_reg (struct frame_info *frame, const void *baton) |
| 79 | { |
| 80 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 81 | if (gdbarch_sp_regnum (gdbarch) >= 0) |
| 82 | return value_of_register (gdbarch_sp_regnum (gdbarch), frame); |
| 83 | error (_("Standard register ``$sp'' is not available for this target")); |
| 84 | } |
| 85 | |
| 86 | static struct value * |
| 87 | value_of_builtin_frame_ps_reg (struct frame_info *frame, const void *baton) |
| 88 | { |
| 89 | struct gdbarch *gdbarch = get_frame_arch (frame); |
| 90 | if (gdbarch_ps_regnum (gdbarch) >= 0) |
| 91 | return value_of_register (gdbarch_ps_regnum (gdbarch), frame); |
| 92 | error (_("Standard register ``$ps'' is not available for this target")); |
| 93 | } |
| 94 | |
| 95 | extern initialize_file_ftype _initialize_frame_reg; /* -Wmissing-prototypes */ |
| 96 | |
| 97 | void |
| 98 | _initialize_frame_reg (void) |
| 99 | { |
| 100 | /* Frame based $fp, $pc, $sp and $ps. These only come into play |
| 101 | when the target does not define its own version of these |
| 102 | registers. */ |
| 103 | user_reg_add_builtin ("fp", value_of_builtin_frame_fp_reg, NULL); |
| 104 | user_reg_add_builtin ("pc", value_of_builtin_frame_pc_reg, NULL); |
| 105 | user_reg_add_builtin ("sp", value_of_builtin_frame_sp_reg, NULL); |
| 106 | user_reg_add_builtin ("ps", value_of_builtin_frame_ps_reg, NULL); |
| 107 | } |