1 /* alpha-dis.c -- Disassemble Alpha AXP instructions 2 Copyright (C) 1996-2014 Free Software Foundation, Inc. 3 Contributed by Richard Henderson <rth (at) tamu.edu>, 4 patterned after the PPC opcode handling written by Ian Lance Taylor. 5 6 This file is part of libopcodes. 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, MA 21 02110-1301, USA. */ 22 23 #include "sysdep.h" 24 #include <stdio.h> 25 #include "dis-asm.h" 26 #include "opcode/alpha.h" 27 28 /* OSF register names. */ 29 30 static const char * const osf_regnames[64] = { 31 "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", 32 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", 33 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", 34 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", 35 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", 36 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", 37 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23", 38 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31" 39 }; 40 41 /* VMS register names. */ 42 43 static const char * const vms_regnames[64] = { 44 "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", 45 "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", 46 "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23", 47 "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ", 48 "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", 49 "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15", 50 "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23", 51 "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ" 52 }; 53 54 /* Disassemble Alpha instructions. */ 55 56 int 57 print_insn_alpha (memaddr, info) 58 bfd_vma memaddr; 59 struct disassemble_info *info; 60 { 61 static const struct alpha_opcode *opcode_index[AXP_NOPS+1]; 62 const char * const * regnames; 63 const struct alpha_opcode *opcode, *opcode_end; 64 const unsigned char *opindex; 65 unsigned insn, op, isa_mask; 66 int need_comma; 67 68 /* Initialize the majorop table the first time through */ 69 if (!opcode_index[0]) 70 { 71 opcode = alpha_opcodes; 72 opcode_end = opcode + alpha_num_opcodes; 73 74 for (op = 0; op < AXP_NOPS; ++op) 75 { 76 opcode_index[op] = opcode; 77 while (opcode < opcode_end && op == AXP_OP (opcode->opcode)) 78 ++opcode; 79 } 80 opcode_index[op] = opcode; 81 } 82 83 if (info->flavour == bfd_target_evax_flavour) 84 regnames = vms_regnames; 85 else 86 regnames = osf_regnames; 87 88 isa_mask = AXP_OPCODE_NOPAL; 89 switch (info->mach) 90 { 91 case bfd_mach_alpha_ev4: 92 isa_mask |= AXP_OPCODE_EV4; 93 break; 94 case bfd_mach_alpha_ev5: 95 isa_mask |= AXP_OPCODE_EV5; 96 break; 97 case bfd_mach_alpha_ev6: 98 isa_mask |= AXP_OPCODE_EV6; 99 break; 100 } 101 102 /* Read the insn into a host word */ 103 { 104 bfd_byte buffer[4]; 105 int status = (*info->read_memory_func) (memaddr, buffer, 4, info); 106 if (status != 0) 107 { 108 (*info->memory_error_func) (status, memaddr, info); 109 return -1; 110 } 111 insn = bfd_getl32 (buffer); 112 } 113 114 /* Get the major opcode of the instruction. */ 115 op = AXP_OP (insn); 116 117 /* Find the first match in the opcode table. */ 118 opcode_end = opcode_index[op + 1]; 119 for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode) 120 { 121 if ((insn ^ opcode->opcode) & opcode->mask) 122 continue; 123 124 if (!(opcode->flags & isa_mask)) 125 continue; 126 127 /* Make two passes over the operands. First see if any of them 128 have extraction functions, and, if they do, make sure the 129 instruction is valid. */ 130 { 131 int invalid = 0; 132 for (opindex = opcode->operands; *opindex != 0; opindex++) 133 { 134 const struct alpha_operand *operand = alpha_operands + *opindex; 135 if (operand->extract) 136 (*operand->extract) (insn, &invalid); 137 } 138 if (invalid) 139 continue; 140 } 141 142 /* The instruction is valid. */ 143 goto found; 144 } 145 146 /* No instruction found */ 147 (*info->fprintf_func) (info->stream, ".long %#08x", insn); 148 149 return 4; 150 151 found: 152 (*info->fprintf_func) (info->stream, "%s", opcode->name); 153 if (opcode->operands[0] != 0) 154 (*info->fprintf_func) (info->stream, "\t"); 155 156 /* Now extract and print the operands. */ 157 need_comma = 0; 158 for (opindex = opcode->operands; *opindex != 0; opindex++) 159 { 160 const struct alpha_operand *operand = alpha_operands + *opindex; 161 int value; 162 163 /* Operands that are marked FAKE are simply ignored. We 164 already made sure that the extract function considered 165 the instruction to be valid. */ 166 if ((operand->flags & AXP_OPERAND_FAKE) != 0) 167 continue; 168 169 /* Extract the value from the instruction. */ 170 if (operand->extract) 171 value = (*operand->extract) (insn, (int *) NULL); 172 else 173 { 174 value = (insn >> operand->shift) & ((1 << operand->bits) - 1); 175 if (operand->flags & AXP_OPERAND_SIGNED) 176 { 177 int signbit = 1 << (operand->bits - 1); 178 value = (value ^ signbit) - signbit; 179 } 180 } 181 182 if (need_comma && 183 ((operand->flags & (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA)) 184 != AXP_OPERAND_PARENS)) 185 { 186 (*info->fprintf_func) (info->stream, ","); 187 } 188 if (operand->flags & AXP_OPERAND_PARENS) 189 (*info->fprintf_func) (info->stream, "("); 190 191 /* Print the operand as directed by the flags. */ 192 if (operand->flags & AXP_OPERAND_IR) 193 (*info->fprintf_func) (info->stream, "%s", regnames[value]); 194 else if (operand->flags & AXP_OPERAND_FPR) 195 (*info->fprintf_func) (info->stream, "%s", regnames[value + 32]); 196 else if (operand->flags & AXP_OPERAND_RELATIVE) 197 (*info->print_address_func) (memaddr + 4 + value, info); 198 else if (operand->flags & AXP_OPERAND_SIGNED) 199 (*info->fprintf_func) (info->stream, "%d", value); 200 else 201 (*info->fprintf_func) (info->stream, "%#x", value); 202 203 if (operand->flags & AXP_OPERAND_PARENS) 204 (*info->fprintf_func) (info->stream, ")"); 205 need_comma = 1; 206 } 207 208 return 4; 209 } 210
