[deliverable/binutils-gdb.git] / opcodes / alpha-dis.c

/* alpha-dis.c -- Disassemble Alpha AXP instructions
   Copyright 1996, 1998, 1999, 2000, 2001 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 <stdio.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->opcode) & opcode->mask)
	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;
}
Commit	Line	Data
252b5132	1	/* alpha-dis.c -- Disassemble Alpha AXP instructions
33822a8e	2	Copyright 1996, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
252b5132 RH	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 GDB, GAS, and the GNU binutils.
	7
	8	GDB, GAS, and the GNU binutils are free software; you can redistribute
	9	them and/or modify them under the terms of the GNU General Public
	10	License as published by the Free Software Foundation; either version
	11	2, or (at your option) any later version.
	12
	13	GDB, GAS, and the GNU binutils are distributed in the hope that they
	14	will be useful, but WITHOUT ANY WARRANTY; without even the implied
	15	warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	16	the GNU General Public 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, 59 Temple Place - Suite 330, Boston, MA
	21	02111-1307, USA. */
	22
252b5132	23	#include <stdio.h>
252b5132 RH	24	#include "sysdep.h"
	25	#include "dis-asm.h"
	26	#include "opcode/alpha.h"
	27
	28	/* OSF register names. */
	29
33822a8e	30	static const char * const osf_regnames[64] = {
252b5132 RH	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
33822a8e	43	static const char * const vms_regnames[64] = {
252b5132 RH	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)
33822a8e KH	75	{
	76	opcode_index[op] = opcode;
	77	while (opcode < opcode_end && op == AXP_OP (opcode->opcode))
252b5132	78	++opcode;
33822a8e	79	}
252b5132 RH	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	{
33822a8e KH	108	(*info->memory_error_func) (status, memaddr, info);
33822a8e KH	109	return -1;
252b5132 RH	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. */
33822a8e	118	opcode_end = opcode_index[op + 1];
252b5132 RH	119	for (opcode = opcode_index[op]; opcode < opcode_end; ++opcode)
252b5132 RH	120	{
98c02720	121	if ((insn ^ opcode->opcode) & opcode->mask)
252b5132 RH	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	{
33822a8e KH	131	int invalid = 0;
33822a8e KH	132	for (opindex = opcode->operands; *opindex != 0; opindex++)
252b5132	133	{
33822a8e	134	const struct alpha_operand operand = alpha_operands + opindex;
252b5132 RH	135	if (operand->extract)
	136	(*operand->extract) (insn, &invalid);
	137	}
33822a8e	138	if (invalid)
252b5132 RH	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);
33822a8e	148
252b5132 RH	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 &&
33822a8e	183	((operand->flags & (AXP_OPERAND_PARENS \| AXP_OPERAND_COMMA))
252b5132 RH	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)
33822a8e	195	(*info->fprintf_func) (info->stream, "%s", regnames[value + 32]);
252b5132 RH	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	}