| 1 | /* Builtin frame register, for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright 2002 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 2 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, write to the Free Software |
| 21 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 22 | Boston, MA 02111-1307, USA. */ |
| 23 | |
| 24 | #include "defs.h" |
| 25 | #include "builtin-regs.h" |
| 26 | #include "frame.h" |
| 27 | #include "gdbtypes.h" |
| 28 | #include "value.h" |
| 29 | #include "gdb_string.h" |
| 30 | |
| 31 | /* Types that describe the various builtin registers. */ |
| 32 | |
| 33 | static struct type *builtin_type_frame_reg; |
| 34 | |
| 35 | /* Constructors for those types. */ |
| 36 | |
| 37 | static void |
| 38 | build_builtin_type_frame_reg (void) |
| 39 | { |
| 40 | /* $frame. */ |
| 41 | if (builtin_type_frame_reg == NULL) |
| 42 | { |
| 43 | #if 0 |
| 44 | struct frame |
| 45 | { |
| 46 | void *base; |
| 47 | }; |
| 48 | #endif |
| 49 | builtin_type_frame_reg = init_composite_type ("frame", TYPE_CODE_STRUCT); |
| 50 | append_composite_type_field (builtin_type_frame_reg, "base", |
| 51 | builtin_type_void_data_ptr); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | static struct value * |
| 56 | value_of_builtin_frame_reg (struct frame_info *frame) |
| 57 | { |
| 58 | struct value *val; |
| 59 | char *buf; |
| 60 | build_builtin_type_frame_reg (); |
| 61 | val = allocate_value (builtin_type_frame_reg); |
| 62 | VALUE_LVAL (val) = not_lval; |
| 63 | buf = VALUE_CONTENTS_RAW (val); |
| 64 | memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); |
| 65 | /* frame.base. */ |
| 66 | if (frame != NULL) |
| 67 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame); |
| 68 | buf += TYPE_LENGTH (builtin_type_void_data_ptr); |
| 69 | /* frame.XXX. */ |
| 70 | return val; |
| 71 | } |
| 72 | |
| 73 | static struct value * |
| 74 | value_of_builtin_frame_fp_reg (struct frame_info *frame) |
| 75 | { |
| 76 | #ifdef FP_REGNUM |
| 77 | if (FP_REGNUM >= 0) |
| 78 | return value_of_register (FP_REGNUM, frame); |
| 79 | #endif |
| 80 | { |
| 81 | struct value *val = allocate_value (builtin_type_void_data_ptr); |
| 82 | char *buf = VALUE_CONTENTS_RAW (val); |
| 83 | if (frame == NULL) |
| 84 | memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); |
| 85 | else |
| 86 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->frame); |
| 87 | return val; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static struct value * |
| 92 | value_of_builtin_frame_pc_reg (struct frame_info *frame) |
| 93 | { |
| 94 | #ifdef PC_REGNUM |
| 95 | if (PC_REGNUM >= 0) |
| 96 | return value_of_register (PC_REGNUM, frame); |
| 97 | #endif |
| 98 | { |
| 99 | struct value *val = allocate_value (builtin_type_void_data_ptr); |
| 100 | char *buf = VALUE_CONTENTS_RAW (val); |
| 101 | if (frame == NULL) |
| 102 | memset (buf, TYPE_LENGTH (VALUE_TYPE (val)), 0); |
| 103 | else |
| 104 | ADDRESS_TO_POINTER (builtin_type_void_data_ptr, buf, frame->pc); |
| 105 | return val; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | static struct value * |
| 110 | value_of_builtin_frame_sp_reg (struct frame_info *frame) |
| 111 | { |
| 112 | #ifdef SP_REGNUM |
| 113 | if (SP_REGNUM >= 0) |
| 114 | return value_of_register (SP_REGNUM, frame); |
| 115 | #endif |
| 116 | error ("Standard register ``$sp'' is not available for this target"); |
| 117 | } |
| 118 | |
| 119 | static struct value * |
| 120 | value_of_builtin_frame_ps_reg (struct frame_info *frame) |
| 121 | { |
| 122 | #ifdef PS_REGNUM |
| 123 | if (PS_REGNUM >= 0) |
| 124 | return value_of_register (PS_REGNUM, frame); |
| 125 | #endif |
| 126 | error ("Standard register ``$ps'' is not available for this target"); |
| 127 | } |
| 128 | |
| 129 | void |
| 130 | _initialize_frame_reg (void) |
| 131 | { |
| 132 | /* FIXME: cagney/2002-02-08: At present the local builtin types |
| 133 | can't be initialized using _initialize*() or gdbarch. Due mainly |
| 134 | to non-multi-arch targets, GDB initializes things piece meal and, |
| 135 | as a consequence can leave these types NULL. */ |
| 136 | REGISTER_GDBARCH_SWAP (builtin_type_frame_reg); |
| 137 | |
| 138 | /* Frame based $fp, $pc, $sp and $ps. These only come into play |
| 139 | when the target does not define its own version of these |
| 140 | registers. */ |
| 141 | add_builtin_reg ("fp", value_of_builtin_frame_fp_reg); |
| 142 | add_builtin_reg ("pc", value_of_builtin_frame_pc_reg); |
| 143 | add_builtin_reg ("sp", value_of_builtin_frame_sp_reg); |
| 144 | add_builtin_reg ("ps", value_of_builtin_frame_ps_reg); |
| 145 | |
| 146 | /* NOTE: cagney/2002-04-05: For moment leave the $frame / $gdbframe |
| 147 | / $gdb.frame disabled. It isn't yet clear which of the many |
| 148 | options is the best. */ |
| 149 | if (0) |
| 150 | add_builtin_reg ("frame", value_of_builtin_frame_reg); |
| 151 | } |