1 /* alpha-dis.c -- Disassemble Alpha AXP instructions 2 Copyright 1996, 1998, 1999, 2000, 2001, 2002, 2005, 2007, 2012 3 Free Software Foundation, Inc. 4 Contributed by Richard Henderson <rth@tamu.edu>, 5 patterned after the PPC opcode handling written by Ian Lance Taylor. 6 7 This file is part of libopcodes. 8 9 This library 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 3, or (at your option) 12 any later version. 13 14 It is distributed in the hope that it will be useful, but WITHOUT 15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 16 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public 17 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, 51 Franklin Street - Fifth Floor, Boston, MA 22 02110-1301, USA. */ 23 24 #include "sysdep.h" 25 #include <stdio.h> 26 #include "dis-asm.h" 27 #include "opcode/alpha.h" 28 29 /* OSF register names. */ 30 31 static const char * const osf_regnames[64] = { 32 "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", 33 "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", 34 "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", 35 "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", 36 "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", 37 "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", 38 "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23", 39 "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31" 40 }; 41 42 /* VMS register names. */ 43 44 static const char * const vms_regnames[64] = { 45 "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", 46 "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", 47 "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23", 48 "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ", 49 "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", 50 "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15", 51 "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23", 52 "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ" 53 }; 54 55 /* Disassemble Alpha instructions. */ 56 57 int 58 print_insn_alpha (memaddr, info) 59 bfd_vma memaddr; 60 struct disassemble_info *info; 61 { 62 static const struct alpha_opcode *opcode_index[AXP_NOPS+1]; 63 const char * const * regnames; 64 const struct alpha_opcode *opcode, *opcode_end; 65 const unsigned char *opindex; 66 unsigned insn, op, isa_mask; 67 int need_comma; 68 69 /* Initialize the majorop table the first time through */ 70 if (!opcode_index[0]) 71 { 72 opcode = alpha_opcodes; 73 opcode_end = opcode + alpha_num_opcodes; 74 75 for (op = 0; op < AXP_NOPS; ++op) 76 { 77 opcode_index[op] = opcode; 78 while (opcode < opcode_end && op == AXP_OP (opcode->opcode)) 79 ++opcode; 80 } 81 opcode_index[op] = opcode; 82 } 83 84 if (info->flavour == bfd_target_evax_flavour) 85 regnames = vms_regnames; 86 else 87 regnames = osf_regnames; 88 89 isa_mask = AXP_OPCODE_NOPAL; 90 switch (info->mach) 91 { 92 case bfd_mach_alpha_ev4: 93 isa_mask |= AXP_OPCODE_EV4; 94 break; 95 case bfd_mach_alpha_ev5: 96 isa_mask |= AXP_OPCODE_EV5; 97 break; 98 case bfd_mach_alpha_ev6: 99 isa_mask |= AXP_OPCODE_EV6; 100 break; 101 } 102 103 /* Read the insn into a host word */ 104 { 105 bfd_byte buffer[4]; 106 int status = (*info->read_memory_func) (memaddr, buffer, 4, info); 107 if (status != 0) 108 { 109 (*info->memory_error_func) (status, memaddr, info); 110 return -1; 111 } 112 insn = bfd_getl32 (buffer); 113 } 114 115 /* Get the major opcode of the instruction. */ 116 op = AXP_OP (insn); 117 118 /* Find the first match in the opcode table. */ 119 opcode_end = opcode_index[op + 1]; 120 for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode) 121 { 122 if ((insn ^ opcode->opcode) & opcode->mask) 123 continue; 124 125 if (!(opcode->flags & isa_mask)) 126 continue; 127 128 /* Make two passes over the operands. First see if any of them 129 have extraction functions, and, if they do, make sure the 130 instruction is valid. */ 131 { 132 int invalid = 0; 133 for (opindex = opcode->operands; *opindex != 0; opindex++) 134 { 135 const struct alpha_operand *operand = alpha_operands + *opindex; 136 if (operand->extract) 137 (*operand->extract) (insn, &invalid); 138 } 139 if (invalid) 140 continue; 141 } 142 143 /* The instruction is valid. */ 144 goto found; 145 } 146 147 /* No instruction found */ 148 (*info->fprintf_func) (info->stream, ".long %#08x", insn); 149 150 return 4; 151 152 found: 153 (*info->fprintf_func) (info->stream, "%s", opcode->name); 154 if (opcode->operands[0] != 0) 155 (*info->fprintf_func) (info->stream, "\t"); 156 157 /* Now extract and print the operands. */ 158 need_comma = 0; 159 for (opindex = opcode->operands; *opindex != 0; opindex++) 160 { 161 const struct alpha_operand *operand = alpha_operands + *opindex; 162 int value; 163 164 /* Operands that are marked FAKE are simply ignored. We 165 already made sure that the extract function considered 166 the instruction to be valid. */ 167 if ((operand->flags & AXP_OPERAND_FAKE) != 0) 168 continue; 169 170 /* Extract the value from the instruction. */ 171 if (operand->extract) 172 value = (*operand->extract) (insn, (int *) NULL); 173 else 174 { 175 value = (insn >> operand->shift) & ((1 << operand->bits) - 1); 176 if (operand->flags & AXP_OPERAND_SIGNED) 177 { 178 int signbit = 1 << (operand->bits - 1); 179 value = (value ^ signbit) - signbit; 180 } 181 } 182 183 if (need_comma && 184 ((operand->flags & (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA)) 185 != AXP_OPERAND_PARENS)) 186 { 187 (*info->fprintf_func) (info->stream, ","); 188 } 189 if (operand->flags & AXP_OPERAND_PARENS) 190 (*info->fprintf_func) (info->stream, "("); 191 192 /* Print the operand as directed by the flags. */ 193 if (operand->flags & AXP_OPERAND_IR) 194 (*info->fprintf_func) (info->stream, "%s", regnames[value]); 195 else if (operand->flags & AXP_OPERAND_FPR) 196 (*info->fprintf_func) (info->stream, "%s", regnames[value + 32]); 197 else if (operand->flags & AXP_OPERAND_RELATIVE) 198 (*info->print_address_func) (memaddr + 4 + value, info); 199 else if (operand->flags & AXP_OPERAND_SIGNED) 200 (*info->fprintf_func) (info->stream, "%d", value); 201 else 202 (*info->fprintf_func) (info->stream, "%#x", value); 203 204 if (operand->flags & AXP_OPERAND_PARENS) 205 (*info->fprintf_func) (info->stream, ")"); 206 need_comma = 1; 207 } 208 209 return 4; 210 } 211