| 1 | /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions |
| 2 | Copyright 1994, 2000, 2003, 2005, 2007 Free Software Foundation, Inc. |
| 3 | PowerPC version written by Ian Lance Taylor, Cygnus Support |
| 4 | Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org> |
| 5 | |
| 6 | This file is part of the GNU opcodes library. |
| 7 | |
| 8 | This library is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3, or (at your option) |
| 11 | any later version. |
| 12 | |
| 13 | It is distributed in the hope that it will be useful, but WITHOUT |
| 14 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 16 | License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this file; see the file COPYING. If not, write to the Free |
| 20 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, |
| 21 | MA 02110-1301, USA. */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include "sysdep.h" |
| 25 | #include "dis-asm.h" |
| 26 | #include "opcode/i370.h" |
| 27 | |
| 28 | /* This file provides several disassembler functions, all of which use |
| 29 | the disassembler interface defined in dis-asm.h. */ |
| 30 | |
| 31 | int |
| 32 | print_insn_i370 (bfd_vma memaddr, struct disassemble_info *info) |
| 33 | { |
| 34 | bfd_byte buffer[8]; |
| 35 | int status; |
| 36 | i370_insn_t insn; |
| 37 | const struct i370_opcode *opcode; |
| 38 | const struct i370_opcode *opcode_end; |
| 39 | |
| 40 | status = (*info->read_memory_func) (memaddr, buffer, 6, info); |
| 41 | if (status != 0) |
| 42 | { |
| 43 | (*info->memory_error_func) (status, memaddr, info); |
| 44 | return -1; |
| 45 | } |
| 46 | |
| 47 | /* Cast the bytes into the insn (in a host-endian indep way). */ |
| 48 | insn.i[0] = (buffer[0] << 24) & 0xff000000; |
| 49 | insn.i[0] |= (buffer[1] << 16) & 0xff0000; |
| 50 | insn.i[0] |= (buffer[2] << 8) & 0xff00; |
| 51 | insn.i[0] |= buffer[3] & 0xff; |
| 52 | insn.i[1] = (buffer[4] << 24) & 0xff000000; |
| 53 | insn.i[1] |= (buffer[5] << 16) & 0xff0000; |
| 54 | |
| 55 | /* Find the first match in the opcode table. We could speed this up |
| 56 | a bit by doing a binary search on the major opcode. */ |
| 57 | opcode_end = i370_opcodes + i370_num_opcodes; |
| 58 | for (opcode = i370_opcodes; opcode < opcode_end; opcode++) |
| 59 | { |
| 60 | const unsigned char *opindex; |
| 61 | const struct i370_operand *operand; |
| 62 | i370_insn_t masked; |
| 63 | int invalid; |
| 64 | |
| 65 | /* Mask off operands, and look for a match ... */ |
| 66 | masked = insn; |
| 67 | if (2 == opcode->len) |
| 68 | { |
| 69 | masked.i[0] >>= 16; |
| 70 | masked.i[0] &= 0xffff; |
| 71 | } |
| 72 | masked.i[0] &= opcode->mask.i[0]; |
| 73 | if (masked.i[0] != opcode->opcode.i[0]) |
| 74 | continue; |
| 75 | |
| 76 | if (6 == opcode->len) |
| 77 | { |
| 78 | masked.i[1] &= opcode->mask.i[1]; |
| 79 | if (masked.i[1] != opcode->opcode.i[1]) |
| 80 | continue; |
| 81 | } |
| 82 | |
| 83 | /* Found a match. adjust a tad. */ |
| 84 | if (2 == opcode->len) |
| 85 | { |
| 86 | insn.i[0] >>= 16; |
| 87 | insn.i[0] &= 0xffff; |
| 88 | } |
| 89 | |
| 90 | /* Make two passes over the operands. First see if any of them |
| 91 | have extraction functions, and, if they do, make sure the |
| 92 | instruction is valid. */ |
| 93 | invalid = 0; |
| 94 | for (opindex = opcode->operands; *opindex != 0; opindex++) |
| 95 | { |
| 96 | operand = i370_operands + *opindex; |
| 97 | if (operand->extract) |
| 98 | (*operand->extract) (insn, &invalid); |
| 99 | } |
| 100 | if (invalid) |
| 101 | continue; |
| 102 | |
| 103 | /* The instruction is valid. */ |
| 104 | (*info->fprintf_func) (info->stream, "%s", opcode->name); |
| 105 | if (opcode->operands[0] != 0) |
| 106 | (*info->fprintf_func) (info->stream, "\t"); |
| 107 | |
| 108 | /* Now extract and print the operands. */ |
| 109 | for (opindex = opcode->operands; *opindex != 0; opindex++) |
| 110 | { |
| 111 | long value; |
| 112 | |
| 113 | operand = i370_operands + *opindex; |
| 114 | |
| 115 | /* Extract the value from the instruction. */ |
| 116 | if (operand->extract) |
| 117 | value = (*operand->extract) (insn, (int *) NULL); |
| 118 | else |
| 119 | value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1); |
| 120 | |
| 121 | /* Print the operand as directed by the flags. */ |
| 122 | if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) |
| 123 | { |
| 124 | if (value) |
| 125 | (*info->fprintf_func) (info->stream, "(r%ld)", value); |
| 126 | } |
| 127 | else if ((operand->flags & I370_OPERAND_SBASE) != 0) |
| 128 | { |
| 129 | (*info->fprintf_func) (info->stream, "(r%ld)", value); |
| 130 | } |
| 131 | else if ((operand->flags & I370_OPERAND_INDEX) != 0) |
| 132 | { |
| 133 | if (value) |
| 134 | (*info->fprintf_func) (info->stream, "(r%ld,", value); |
| 135 | else |
| 136 | (*info->fprintf_func) (info->stream, "(,"); |
| 137 | } |
| 138 | else if ((operand->flags & I370_OPERAND_LENGTH) != 0) |
| 139 | { |
| 140 | (*info->fprintf_func) (info->stream, "(%ld,", value); |
| 141 | } |
| 142 | else if ((operand->flags & I370_OPERAND_BASE) != 0) |
| 143 | (*info->fprintf_func) (info->stream, "r%ld)", value); |
| 144 | else if ((operand->flags & I370_OPERAND_GPR) != 0) |
| 145 | (*info->fprintf_func) (info->stream, "r%ld,", value); |
| 146 | else if ((operand->flags & I370_OPERAND_FPR) != 0) |
| 147 | (*info->fprintf_func) (info->stream, "f%ld,", value); |
| 148 | else if ((operand->flags & I370_OPERAND_RELATIVE) != 0) |
| 149 | (*info->fprintf_func) (info->stream, "%ld", value); |
| 150 | else |
| 151 | (*info->fprintf_func) (info->stream, " %ld, ", value); |
| 152 | } |
| 153 | |
| 154 | return opcode->len; |
| 155 | } |
| 156 | |
| 157 | /* We could not find a match. */ |
| 158 | (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]); |
| 159 | |
| 160 | return 2; |
| 161 | } |