| 1 | /* alpha-dis.c -- Disassemble Alpha AXP instructions |
| 2 | Copyright (C) 1996-2017 Free Software Foundation, Inc. |
| 3 | Contributed by Richard Henderson <rth@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 "disassemble.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 (bfd_vma memaddr, struct disassemble_info *info) |
| 58 | { |
| 59 | static const struct alpha_opcode *opcode_index[AXP_NOPS+1]; |
| 60 | const char * const * regnames; |
| 61 | const struct alpha_opcode *opcode, *opcode_end; |
| 62 | const unsigned char *opindex; |
| 63 | unsigned insn, op, isa_mask; |
| 64 | int need_comma; |
| 65 | |
| 66 | /* Initialize the majorop table the first time through */ |
| 67 | if (!opcode_index[0]) |
| 68 | { |
| 69 | opcode = alpha_opcodes; |
| 70 | opcode_end = opcode + alpha_num_opcodes; |
| 71 | |
| 72 | for (op = 0; op < AXP_NOPS; ++op) |
| 73 | { |
| 74 | opcode_index[op] = opcode; |
| 75 | while (opcode < opcode_end && op == AXP_OP (opcode->opcode)) |
| 76 | ++opcode; |
| 77 | } |
| 78 | opcode_index[op] = opcode; |
| 79 | } |
| 80 | |
| 81 | if (info->flavour == bfd_target_evax_flavour) |
| 82 | regnames = vms_regnames; |
| 83 | else |
| 84 | regnames = osf_regnames; |
| 85 | |
| 86 | isa_mask = AXP_OPCODE_NOPAL; |
| 87 | switch (info->mach) |
| 88 | { |
| 89 | case bfd_mach_alpha_ev4: |
| 90 | isa_mask |= AXP_OPCODE_EV4; |
| 91 | break; |
| 92 | case bfd_mach_alpha_ev5: |
| 93 | isa_mask |= AXP_OPCODE_EV5; |
| 94 | break; |
| 95 | case bfd_mach_alpha_ev6: |
| 96 | isa_mask |= AXP_OPCODE_EV6; |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | /* Read the insn into a host word */ |
| 101 | { |
| 102 | bfd_byte buffer[4]; |
| 103 | int status = (*info->read_memory_func) (memaddr, buffer, 4, info); |
| 104 | if (status != 0) |
| 105 | { |
| 106 | (*info->memory_error_func) (status, memaddr, info); |
| 107 | return -1; |
| 108 | } |
| 109 | insn = bfd_getl32 (buffer); |
| 110 | } |
| 111 | |
| 112 | /* Get the major opcode of the instruction. */ |
| 113 | op = AXP_OP (insn); |
| 114 | |
| 115 | /* Find the first match in the opcode table. */ |
| 116 | opcode_end = opcode_index[op + 1]; |
| 117 | for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode) |
| 118 | { |
| 119 | if ((insn ^ opcode->opcode) & opcode->mask) |
| 120 | continue; |
| 121 | |
| 122 | if (!(opcode->flags & isa_mask)) |
| 123 | continue; |
| 124 | |
| 125 | /* Make two passes over the operands. First see if any of them |
| 126 | have extraction functions, and, if they do, make sure the |
| 127 | instruction is valid. */ |
| 128 | { |
| 129 | int invalid = 0; |
| 130 | for (opindex = opcode->operands; *opindex != 0; opindex++) |
| 131 | { |
| 132 | const struct alpha_operand *operand = alpha_operands + *opindex; |
| 133 | if (operand->extract) |
| 134 | (*operand->extract) (insn, &invalid); |
| 135 | } |
| 136 | if (invalid) |
| 137 | continue; |
| 138 | } |
| 139 | |
| 140 | /* The instruction is valid. */ |
| 141 | goto found; |
| 142 | } |
| 143 | |
| 144 | /* No instruction found */ |
| 145 | (*info->fprintf_func) (info->stream, ".long %#08x", insn); |
| 146 | |
| 147 | return 4; |
| 148 | |
| 149 | found: |
| 150 | (*info->fprintf_func) (info->stream, "%s", opcode->name); |
| 151 | if (opcode->operands[0] != 0) |
| 152 | (*info->fprintf_func) (info->stream, "\t"); |
| 153 | |
| 154 | /* Now extract and print the operands. */ |
| 155 | need_comma = 0; |
| 156 | for (opindex = opcode->operands; *opindex != 0; opindex++) |
| 157 | { |
| 158 | const struct alpha_operand *operand = alpha_operands + *opindex; |
| 159 | int value; |
| 160 | |
| 161 | /* Operands that are marked FAKE are simply ignored. We |
| 162 | already made sure that the extract function considered |
| 163 | the instruction to be valid. */ |
| 164 | if ((operand->flags & AXP_OPERAND_FAKE) != 0) |
| 165 | continue; |
| 166 | |
| 167 | /* Extract the value from the instruction. */ |
| 168 | if (operand->extract) |
| 169 | value = (*operand->extract) (insn, (int *) NULL); |
| 170 | else |
| 171 | { |
| 172 | value = (insn >> operand->shift) & ((1 << operand->bits) - 1); |
| 173 | if (operand->flags & AXP_OPERAND_SIGNED) |
| 174 | { |
| 175 | int signbit = 1 << (operand->bits - 1); |
| 176 | value = (value ^ signbit) - signbit; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | if (need_comma && |
| 181 | ((operand->flags & (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA)) |
| 182 | != AXP_OPERAND_PARENS)) |
| 183 | { |
| 184 | (*info->fprintf_func) (info->stream, ","); |
| 185 | } |
| 186 | if (operand->flags & AXP_OPERAND_PARENS) |
| 187 | (*info->fprintf_func) (info->stream, "("); |
| 188 | |
| 189 | /* Print the operand as directed by the flags. */ |
| 190 | if (operand->flags & AXP_OPERAND_IR) |
| 191 | (*info->fprintf_func) (info->stream, "%s", regnames[value]); |
| 192 | else if (operand->flags & AXP_OPERAND_FPR) |
| 193 | (*info->fprintf_func) (info->stream, "%s", regnames[value + 32]); |
| 194 | else if (operand->flags & AXP_OPERAND_RELATIVE) |
| 195 | (*info->print_address_func) (memaddr + 4 + value, info); |
| 196 | else if (operand->flags & AXP_OPERAND_SIGNED) |
| 197 | (*info->fprintf_func) (info->stream, "%d", value); |
| 198 | else |
| 199 | (*info->fprintf_func) (info->stream, "%#x", value); |
| 200 | |
| 201 | if (operand->flags & AXP_OPERAND_PARENS) |
| 202 | (*info->fprintf_func) (info->stream, ")"); |
| 203 | need_comma = 1; |
| 204 | } |
| 205 | |
| 206 | return 4; |
| 207 | } |