1 2 /* i370-dis.c -- Disassemble Instruction 370 (ESA/390) instructions 3 Copyright 1994, 2000 Free Software Foundation, Inc. 4 PowerPC version written by Ian Lance Taylor, Cygnus Support 5 Rewritten for i370 ESA/390 support by Linas Vepstas <linas@linas.org> 6 7 This file is part of GDB, GAS, and the GNU binutils. 8 9 GDB, GAS, and the GNU binutils are free software; you can redistribute 10 them and/or modify them under the terms of the GNU General Public 11 License as published by the Free Software Foundation; either version 12 2, or (at your option) any later version. 13 14 GDB, GAS, and the GNU binutils are distributed in the hope that they 15 will be useful, but WITHOUT ANY WARRANTY; without even the implied 16 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 17 the 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 file; see the file COPYING. If not, write to the Free 21 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 32 int 33 print_insn_i370 (memaddr, info) 34 bfd_vma memaddr; 35 struct disassemble_info *info; 36 { 37 bfd_byte buffer[8]; 38 int status; 39 i370_insn_t insn; 40 const struct i370_opcode *opcode; 41 const struct i370_opcode *opcode_end; 42 43 status = (*info->read_memory_func) (memaddr, buffer, 6, info); 44 if (status != 0) 45 { 46 (*info->memory_error_func) (status, memaddr, info); 47 return -1; 48 } 49 50 /* Cast the bytes into the insn (in a host-endian indep way) */ 51 insn.i[0] = (buffer[0] << 24) & 0xff000000; 52 insn.i[0] |= (buffer[1] << 16) & 0xff0000; 53 insn.i[0] |= (buffer[2] << 8) & 0xff00; 54 insn.i[0] |= buffer[3] & 0xff; 55 insn.i[1] = (buffer[4] << 24) & 0xff000000; 56 insn.i[1] |= (buffer[5] << 16) & 0xff0000; 57 58 /* Find the first match in the opcode table. We could speed this up 59 a bit by doing a binary search on the major opcode. */ 60 opcode_end = i370_opcodes + i370_num_opcodes; 61 for (opcode = i370_opcodes; opcode < opcode_end; opcode++) 62 { 63 const unsigned char *opindex; 64 const struct i370_operand *operand; 65 i370_insn_t masked; 66 int invalid; 67 68 /* Mask off operands, and look for a match ... */ 69 masked = insn; 70 if (2 == opcode->len) 71 { 72 masked.i[0] >>= 16; 73 masked.i[0] &= 0xffff; 74 } 75 masked.i[0] &= opcode->mask.i[0]; 76 if (masked.i[0] != opcode->opcode.i[0]) continue; 77 78 if (6 == opcode->len) 79 { 80 masked.i[1] &= opcode->mask.i[1]; 81 if (masked.i[1] != opcode->opcode.i[1]) continue; 82 } 83 84 /* Found a match. adjust a tad */ 85 if (2 == opcode->len) 86 { 87 insn.i[0] >>= 16; 88 insn.i[0] &= 0xffff; 89 } 90 91 /* Make two passes over the operands. First see if any of them 92 have extraction functions, and, if they do, make sure the 93 instruction is valid. */ 94 invalid = 0; 95 for (opindex = opcode->operands; *opindex != 0; opindex++) 96 { 97 operand = i370_operands + *opindex; 98 if (operand->extract) 99 (*operand->extract) (insn, &invalid); 100 } 101 if (invalid) 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 { 120 value = (insn.i[0] >> operand->shift) & ((1 << operand->bits) - 1); 121 } 122 123 /* Print the operand as directed by the flags. */ 124 if ((operand->flags & I370_OPERAND_OPTIONAL) != 0) 125 { 126 if (value) 127 (*info->fprintf_func) (info->stream, "(r%ld)", value); 128 } 129 else if ((operand->flags & I370_OPERAND_SBASE) != 0) 130 { 131 (*info->fprintf_func) (info->stream, "(r%ld)", value); 132 } 133 else if ((operand->flags & I370_OPERAND_INDEX) != 0) 134 { 135 if (value) 136 (*info->fprintf_func) (info->stream, "(r%ld,", value); 137 else 138 (*info->fprintf_func) (info->stream, "(,"); 139 } 140 else if ((operand->flags & I370_OPERAND_LENGTH) != 0) 141 { 142 (*info->fprintf_func) (info->stream, "(%ld,", value); 143 } 144 else if ((operand->flags & I370_OPERAND_BASE) != 0) 145 (*info->fprintf_func) (info->stream, "r%ld)", value); 146 else if ((operand->flags & I370_OPERAND_GPR) != 0) 147 (*info->fprintf_func) (info->stream, "r%ld,", value); 148 else if ((operand->flags & I370_OPERAND_FPR) != 0) 149 (*info->fprintf_func) (info->stream, "f%ld,", value); 150 else if ((operand->flags & I370_OPERAND_RELATIVE) != 0) 151 (*info->fprintf_func) (info->stream, "%ld", value); 152 else 153 (*info->fprintf_func) (info->stream, " %ld, ", value); 154 155 } 156 157 return opcode->len; 158 159 } 160 161 162 /* We could not find a match. */ 163 (*info->fprintf_func) (info->stream, ".short 0x%02x%02x", buffer[0], buffer[1]); 164 165 return 2; 166 } 167