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Diffstat (limited to 'opcodes/alpha-dis.c')
| -rw-r--r-- | opcodes/alpha-dis.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/opcodes/alpha-dis.c b/opcodes/alpha-dis.c new file mode 100644 index 00000000000..db55799ee68 --- /dev/null +++ b/opcodes/alpha-dis.c @@ -0,0 +1,213 @@ +/* alpha-dis.c -- Disassemble Alpha AXP instructions + Copyright 1996, 1999 Free Software Foundation, Inc. + Contributed by Richard Henderson <rth@tamu.edu>, + patterned after the PPC opcode handling written by Ian Lance Taylor. + +This file is part of GDB, GAS, and the GNU binutils. + +GDB, GAS, and the GNU binutils are free software; you can redistribute +them and/or modify them under the terms of the GNU General Public +License as published by the Free Software Foundation; either version +2, or (at your option) any later version. + +GDB, GAS, and the GNU binutils are distributed in the hope that they +will be useful, but WITHOUT ANY WARRANTY; without even the implied +warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See +the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this file; see the file COPYING. If not, write to the Free +Software Foundation, 59 Temple Place - Suite 330, Boston, MA +02111-1307, USA. */ + +#include <stdlib.h> +#include <stdio.h> +#include "ansidecl.h" +#include "sysdep.h" +#include "dis-asm.h" +#include "opcode/alpha.h" + +/* OSF register names. */ + +static const char * const osf_regnames[64] = +{ + "v0", "t0", "t1", "t2", "t3", "t4", "t5", "t6", + "t7", "s0", "s1", "s2", "s3", "s4", "s5", "fp", + "a0", "a1", "a2", "a3", "a4", "a5", "t8", "t9", + "t10", "t11", "ra", "t12", "at", "gp", "sp", "zero", + "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", + "$f8", "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", + "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23", + "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31" +}; + +/* VMS register names. */ + +static const char * const vms_regnames[64] = +{ + "R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", + "R8", "R9", "R10", "R11", "R12", "R13", "R14", "R15", + "R16", "R17", "R18", "R19", "R20", "R21", "R22", "R23", + "R24", "AI", "RA", "PV", "AT", "FP", "SP", "RZ", + "F0", "F1", "F2", "F3", "F4", "F5", "F6", "F7", + "F8", "F9", "F10", "F11", "F12", "F13", "F14", "F15", + "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23", + "F24", "F25", "F26", "F27", "F28", "F29", "F30", "FZ" +}; + +/* Disassemble Alpha instructions. */ + +int +print_insn_alpha (memaddr, info) + bfd_vma memaddr; + struct disassemble_info *info; +{ + static const struct alpha_opcode *opcode_index[AXP_NOPS+1]; + const char * const * regnames; + const struct alpha_opcode *opcode, *opcode_end; + const unsigned char *opindex; + unsigned insn, op, isa_mask; + int need_comma; + + /* Initialize the majorop table the first time through */ + if (!opcode_index[0]) + { + opcode = alpha_opcodes; + opcode_end = opcode + alpha_num_opcodes; + + for (op = 0; op < AXP_NOPS; ++op) + { + opcode_index[op] = opcode; + while (opcode < opcode_end && op == AXP_OP (opcode->opcode)) + ++opcode; + } + opcode_index[op] = opcode; + } + + if (info->flavour == bfd_target_evax_flavour) + regnames = vms_regnames; + else + regnames = osf_regnames; + + isa_mask = AXP_OPCODE_NOPAL; + switch (info->mach) + { + case bfd_mach_alpha_ev4: + isa_mask |= AXP_OPCODE_EV4; + break; + case bfd_mach_alpha_ev5: + isa_mask |= AXP_OPCODE_EV5; + break; + case bfd_mach_alpha_ev6: + isa_mask |= AXP_OPCODE_EV6; + break; + } + + /* Read the insn into a host word */ + { + bfd_byte buffer[4]; + int status = (*info->read_memory_func) (memaddr, buffer, 4, info); + if (status != 0) + { + (*info->memory_error_func) (status, memaddr, info); + return -1; + } + insn = bfd_getl32 (buffer); + } + + /* Get the major opcode of the instruction. */ + op = AXP_OP (insn); + + /* Find the first match in the opcode table. */ + opcode_end = opcode_index[op+1]; + for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode) + { + if ((insn & opcode->mask) != opcode->opcode) + continue; + + if (!(opcode->flags & isa_mask)) + continue; + + /* Make two passes over the operands. First see if any of them + have extraction functions, and, if they do, make sure the + instruction is valid. */ + { + int invalid = 0; + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + const struct alpha_operand *operand = alpha_operands + *opindex; + if (operand->extract) + (*operand->extract) (insn, &invalid); + } + if (invalid) + continue; + } + + /* The instruction is valid. */ + goto found; + } + + /* No instruction found */ + (*info->fprintf_func) (info->stream, ".long %#08x", insn); + + return 4; + +found: + (*info->fprintf_func) (info->stream, "%s", opcode->name); + if (opcode->operands[0] != 0) + (*info->fprintf_func) (info->stream, "\t"); + + /* Now extract and print the operands. */ + need_comma = 0; + for (opindex = opcode->operands; *opindex != 0; opindex++) + { + const struct alpha_operand *operand = alpha_operands + *opindex; + int value; + + /* Operands that are marked FAKE are simply ignored. We + already made sure that the extract function considered + the instruction to be valid. */ + if ((operand->flags & AXP_OPERAND_FAKE) != 0) + continue; + + /* Extract the value from the instruction. */ + if (operand->extract) + value = (*operand->extract) (insn, (int *) NULL); + else + { + value = (insn >> operand->shift) & ((1 << operand->bits) - 1); + if (operand->flags & AXP_OPERAND_SIGNED) + { + int signbit = 1 << (operand->bits - 1); + value = (value ^ signbit) - signbit; + } + } + + if (need_comma && + ((operand->flags & (AXP_OPERAND_PARENS|AXP_OPERAND_COMMA)) + != AXP_OPERAND_PARENS)) + { + (*info->fprintf_func) (info->stream, ","); + } + if (operand->flags & AXP_OPERAND_PARENS) + (*info->fprintf_func) (info->stream, "("); + + /* Print the operand as directed by the flags. */ + if (operand->flags & AXP_OPERAND_IR) + (*info->fprintf_func) (info->stream, "%s", regnames[value]); + else if (operand->flags & AXP_OPERAND_FPR) + (*info->fprintf_func) (info->stream, "%s", regnames[value+32]); + else if (operand->flags & AXP_OPERAND_RELATIVE) + (*info->print_address_func) (memaddr + 4 + value, info); + else if (operand->flags & AXP_OPERAND_SIGNED) + (*info->fprintf_func) (info->stream, "%d", value); + else + (*info->fprintf_func) (info->stream, "%#x", value); + + if (operand->flags & AXP_OPERAND_PARENS) + (*info->fprintf_func) (info->stream, ")"); + need_comma = 1; + } + + return 4; +} |