--- /dev/null
+/* alpha-dis.c -- Disassemble Alpha AXP instructions
+ Copyright 1996 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"
+
+static int print_insn_alpha
+ PARAMS ((bfd_vma, struct disassemble_info *, const char * const *, int));
+
+/* Disassemble Alpha instructions using OSF register names. */
+
+int
+print_insn_alpha_osf (memaddr, info)
+ bfd_vma memaddr;
+ struct disassemble_info *info;
+{
+ 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"
+ };
+
+ return print_insn_alpha (memaddr, info, osf_regnames, -1);
+}
+
+/* Disassemble Alpha instructions using VMS register names. */
+
+int
+print_insn_alpha_vms (memaddr, info)
+ bfd_vma memaddr;
+ struct disassemble_info *info;
+{
+ 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"
+ };
+
+ return print_insn_alpha (memaddr, info, vms_regnames, -1);
+}
+
+/* Disassemble Alpha instructions. */
+
+static int
+print_insn_alpha (memaddr, info, regnames, cpumask)
+ bfd_vma memaddr;
+ struct disassemble_info *info;
+ const char * const * regnames;
+ int cpumask;
+{
+ static const struct alpha_opcode *opcode_index[AXP_NOPS+1];
+ const struct alpha_opcode *opcode, *opcode_end;
+ const unsigned char *opindex;
+ unsigned insn, op;
+ 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;
+ }
+
+ /* 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 & cpumask))
+ 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;
+}
projects / binutils-gdb.git / commitdiff