| 1 | /* pj-dis.c -- Disassemble picoJava instructions. |
| 2 | Copyright (C) 1999 Free Software Foundation, Inc. |
| 3 | Contributed by Steve Chamberlain, of Transmeta (sac@pobox.com). |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2 of the License, or |
| 8 | (at your option) any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software |
| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 18 | |
| 19 | |
| 20 | #include <stdio.h> |
| 21 | #include "sysdep.h" |
| 22 | #include "opcode/pj.h" |
| 23 | #include "dis-asm.h" |
| 24 | |
| 25 | extern const pj_opc_info_t pj_opc_info[512]; |
| 26 | |
| 27 | static int get_int (memaddr, iptr, info) |
| 28 | bfd_vma memaddr; |
| 29 | int *iptr; |
| 30 | struct disassemble_info *info; |
| 31 | { |
| 32 | unsigned char ival[4]; |
| 33 | |
| 34 | int status = info->read_memory_func (memaddr, ival, 4, info); |
| 35 | |
| 36 | *iptr = (ival[0] << 24) |
| 37 | | (ival[1] << 16) |
| 38 | | (ival[2] << 8) |
| 39 | | (ival[3] << 0) ; |
| 40 | |
| 41 | return status; |
| 42 | } |
| 43 | |
| 44 | int |
| 45 | print_insn_pj (addr, info) |
| 46 | bfd_vma addr; |
| 47 | struct disassemble_info *info; |
| 48 | { |
| 49 | fprintf_ftype fprintf_fn = info->fprintf_func; |
| 50 | void *stream = info->stream; |
| 51 | unsigned char opcode; |
| 52 | int status; |
| 53 | |
| 54 | if ((status = info->read_memory_func (addr, &opcode, 1, info))) |
| 55 | goto fail; |
| 56 | |
| 57 | if (opcode == 0xff) |
| 58 | { |
| 59 | unsigned char byte_2; |
| 60 | if ((status = info->read_memory_func (addr + 1, &byte_2, 1, info))) |
| 61 | goto fail; |
| 62 | fprintf_fn (stream, "%s\t", pj_opc_info[opcode + byte_2].name); |
| 63 | return 2; |
| 64 | } |
| 65 | else |
| 66 | { |
| 67 | char *sep = "\t"; |
| 68 | int insn_start = addr; |
| 69 | const pj_opc_info_t *op = &pj_opc_info[opcode]; |
| 70 | int a; |
| 71 | addr++; |
| 72 | fprintf_fn (stream, "%s", op->name); |
| 73 | |
| 74 | /* The tableswitch instruction is followed by the default |
| 75 | address, low value, high value and the destinations. */ |
| 76 | |
| 77 | if (strcmp (op->name, "tableswitch") == 0) |
| 78 | { |
| 79 | int lowval; |
| 80 | int highval; |
| 81 | int val; |
| 82 | |
| 83 | addr = (addr + 3) & ~3; |
| 84 | if ((status = get_int (addr, &val, info))) |
| 85 | goto fail; |
| 86 | |
| 87 | fprintf_fn (stream," default: "); |
| 88 | (*info->print_address_func) (val + insn_start, info); |
| 89 | addr += 4; |
| 90 | |
| 91 | if ((status = get_int (addr, &lowval, info))) |
| 92 | goto fail; |
| 93 | addr += 4; |
| 94 | |
| 95 | if ((status = get_int (addr, &highval, info))) |
| 96 | goto fail; |
| 97 | addr += 4; |
| 98 | |
| 99 | while (lowval <= highval) { |
| 100 | if ((status = get_int (addr, &val, info))) |
| 101 | goto fail; |
| 102 | fprintf_fn (stream," %d:[", lowval); |
| 103 | (*info->print_address_func) (val + insn_start, info); |
| 104 | fprintf_fn (stream," ]"); |
| 105 | addr += 4; |
| 106 | lowval++; |
| 107 | } |
| 108 | return addr - insn_start; |
| 109 | } |
| 110 | |
| 111 | /* The lookupswitch instruction is followed by the default |
| 112 | address, element count and pairs of values and |
| 113 | addresses. */ |
| 114 | |
| 115 | if (strcmp (op->name, "lookupswitch") == 0) |
| 116 | { |
| 117 | int count; |
| 118 | int val; |
| 119 | |
| 120 | addr = (addr + 3) & ~3; |
| 121 | if ((status = get_int (addr, &val, info))) |
| 122 | goto fail; |
| 123 | addr += 4; |
| 124 | |
| 125 | fprintf_fn (stream," default: "); |
| 126 | (*info->print_address_func) (val + insn_start, info); |
| 127 | |
| 128 | if ((status = get_int (addr, &count, info))) |
| 129 | goto fail; |
| 130 | addr += 4; |
| 131 | |
| 132 | while (count--) { |
| 133 | if ((status = get_int (addr, &val, info))) |
| 134 | goto fail; |
| 135 | addr += 4; |
| 136 | fprintf_fn (stream," %d:[", val); |
| 137 | |
| 138 | if ((status = get_int (addr, &val, info))) |
| 139 | goto fail; |
| 140 | addr += 4; |
| 141 | |
| 142 | (*info->print_address_func) (val + insn_start, info); |
| 143 | fprintf_fn (stream," ]"); |
| 144 | } |
| 145 | return addr - insn_start; |
| 146 | } |
| 147 | for (a = 0; op->arg[a]; a++) |
| 148 | { |
| 149 | unsigned char data[4]; |
| 150 | int val = 0; |
| 151 | int i; |
| 152 | int size = ASIZE (op->arg[a]); |
| 153 | |
| 154 | if ((status = info->read_memory_func (addr, data, size, info))) |
| 155 | goto fail; |
| 156 | |
| 157 | val = (UNS (op->arg[0]) || ((data[0] & 0x80) == 0)) ? 0 : -1; |
| 158 | |
| 159 | for (i = 0; i < size; i++) |
| 160 | val = (val << 8) | (data[i] & 0xff); |
| 161 | |
| 162 | if (PCREL (op->arg[a])) |
| 163 | (*info->print_address_func) (val + insn_start, info); |
| 164 | else |
| 165 | fprintf_fn (stream, "%s%d", sep, val); |
| 166 | |
| 167 | sep = ","; |
| 168 | addr += size; |
| 169 | } |
| 170 | return op->len; |
| 171 | } |
| 172 | |
| 173 | fail: |
| 174 | info->memory_error_func (status, addr, info); |
| 175 | return -1; |
| 176 | } |