binutils-gdb/opcodes/m32r-dis.c

/* Disassembler interface for targets using CGEN. -*- C -*-
   CGEN: Cpu tools GENerator

THIS FILE IS MACHINE GENERATED WITH CGEN.
- the resultant file is machine generated, cgen-dis.in isn't

Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.

This file is part of the GNU Binutils and GDB, the GNU debugger.

This program is free software; you can redistribute it and/or modify
it 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.

This program is distributed in the hope that it 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 program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* ??? Eventually more and more of this stuff can go to cpu-independent files.
   Keep that in mind.  */

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "dis-asm.h"
#include "bfd.h"
#include "symcat.h"
#include "m32r-desc.h"
#include "m32r-opc.h"
#include "opintl.h"

/* Default text to print if an instruction isn't recognized.  */
#define UNKNOWN_INSN_MSG _("*unknown*")

static void print_normal
     PARAMS ((CGEN_CPU_DESC, PTR, long, unsigned int, bfd_vma, int));
static void print_address
     PARAMS ((CGEN_CPU_DESC, PTR, bfd_vma, unsigned int, bfd_vma, int));
static void print_keyword
     PARAMS ((CGEN_CPU_DESC, PTR, CGEN_KEYWORD *, long, unsigned int));
static void print_insn_normal
     PARAMS ((CGEN_CPU_DESC, PTR, const CGEN_INSN *, CGEN_FIELDS *,
	      bfd_vma, int));
static int print_insn PARAMS ((CGEN_CPU_DESC, bfd_vma,
			       disassemble_info *, char *, int));
static int default_print_insn
     PARAMS ((CGEN_CPU_DESC, bfd_vma, disassemble_info *));

/* -- disassembler routines inserted here */

/* -- dis.c */

/* Immediate values are prefixed with '#'.  */

#define CGEN_PRINT_NORMAL(cd, info, value, attrs, pc, length) \
do { \
  if (CGEN_BOOL_ATTR ((attrs), CGEN_OPERAND_HASH_PREFIX)) \
    (*info->fprintf_func) (info->stream, "#"); \
} while (0)

/* Handle '#' prefixes as operands.  */

static void
print_hash (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  disassemble_info *info = (disassemble_info *) dis_info;
  (*info->fprintf_func) (info->stream, "#");
}

#undef CGEN_PRINT_INSN
#define CGEN_PRINT_INSN my_print_insn

static int
my_print_insn (cd, pc, info)
     CGEN_CPU_DESC cd;
     bfd_vma pc;
     disassemble_info *info;
{
  char buffer[CGEN_MAX_INSN_SIZE];
  char *buf = buffer;
  int status;
  int buflen = (pc & 3) == 0 ? 4 : 2;

  /* Read the base part of the insn.  */

  status = (*info->read_memory_func) (pc, buf, buflen, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  /* 32 bit insn?  */
  if ((pc & 3) == 0 && (buf[0] & 0x80) != 0)
    return print_insn (cd, pc, info, buf, buflen);

  /* Print the first insn.  */
  if ((pc & 3) == 0)
    {
      if (print_insn (cd, pc, info, buf, 2) == 0)
	(*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
      buf += 2;
    }

  if (buf[0] & 0x80)
    {
      /* Parallel.  */
      (*info->fprintf_func) (info->stream, " || ");
      buf[0] &= 0x7f;
    }
  else
    (*info->fprintf_func) (info->stream, " -> ");

  /* The "& 3" is to pass a consistent address.
     Parallel insns arguably both begin on the word boundary.
     Also, branch insns are calculated relative to the word boundary.  */
  if (print_insn (cd, pc & ~ (bfd_vma) 3, info, buf, 2) == 0)
    (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);

  return (pc & 3) ? 2 : 4;
}

/* -- */

/* Main entry point for printing operands.
   XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
   of dis-asm.h on cgen.h.

   This function is basically just a big switch statement.  Earlier versions
   used tables to look up the function to use, but
   - if the table contains both assembler and disassembler functions then
     the disassembler contains much of the assembler and vice-versa,
   - there's a lot of inlining possibilities as things grow,
   - using a switch statement avoids the function call overhead.

   This function could be moved into `print_insn_normal', but keeping it
   separate makes clear the interface between `print_insn_normal' and each of
   the handlers.
*/

void
m32r_cgen_print_operand (cd, opindex, xinfo, fields, attrs, pc, length)
     CGEN_CPU_DESC cd;
     int opindex;
     PTR xinfo;
     CGEN_FIELDS *fields;
     void const *attrs;
     bfd_vma pc;
     int length;
{
 disassemble_info *info = (disassemble_info *) xinfo;

  switch (opindex)
    {
    case M32R_OPERAND_DCR :
      print_keyword (cd, info, & m32r_cgen_opval_cr_names, fields->f_r1, 0);
      break;
    case M32R_OPERAND_DISP16 :
      print_address (cd, info, fields->f_disp16, 0|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case M32R_OPERAND_DISP24 :
      print_address (cd, info, fields->f_disp24, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case M32R_OPERAND_DISP8 :
      print_address (cd, info, fields->f_disp8, 0|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case M32R_OPERAND_DR :
      print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r1, 0);
      break;
    case M32R_OPERAND_HASH :
      print_hash (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case M32R_OPERAND_HI16 :
      print_normal (cd, info, fields->f_hi16, 0|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
      break;
    case M32R_OPERAND_SCR :
      print_keyword (cd, info, & m32r_cgen_opval_cr_names, fields->f_r2, 0);
      break;
    case M32R_OPERAND_SIMM16 :
      print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case M32R_OPERAND_SIMM8 :
      print_normal (cd, info, fields->f_simm8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case M32R_OPERAND_SLO16 :
      print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case M32R_OPERAND_SR :
      print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r2, 0);
      break;
    case M32R_OPERAND_SRC1 :
      print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r1, 0);
      break;
    case M32R_OPERAND_SRC2 :
      print_keyword (cd, info, & m32r_cgen_opval_gr_names, fields->f_r2, 0);
      break;
    case M32R_OPERAND_UIMM16 :
      print_normal (cd, info, fields->f_uimm16, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case M32R_OPERAND_UIMM24 :
      print_address (cd, info, fields->f_uimm24, 0|(1<<CGEN_OPERAND_HASH_PREFIX)|(1<<CGEN_OPERAND_RELOC)|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;
    case M32R_OPERAND_UIMM4 :
      print_normal (cd, info, fields->f_uimm4, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case M32R_OPERAND_UIMM5 :
      print_normal (cd, info, fields->f_uimm5, 0|(1<<CGEN_OPERAND_HASH_PREFIX), pc, length);
      break;
    case M32R_OPERAND_ULO16 :
      print_normal (cd, info, fields->f_uimm16, 0, pc, length);
      break;

    default :
      /* xgettext:c-format */
      fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
	       opindex);
    abort ();
  }
}

cgen_print_fn * const m32r_cgen_print_handlers[] = 
{
  print_insn_normal,
};


void
m32r_cgen_init_dis (cd)
     CGEN_CPU_DESC cd;
{
  m32r_cgen_init_opcode_table (cd);
  m32r_cgen_init_ibld_table (cd);
  cd->print_handlers = & m32r_cgen_print_handlers[0];
  cd->print_operand = m32r_cgen_print_operand;
}


/* Default print handler.  */

static void
print_normal (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_NORMAL
  CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", value);
}

/* Default address handler.  */

static void
print_address (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     bfd_vma value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_ADDRESS
  CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", (long) value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
}

/* Keyword print handler.  */

static void
print_keyword (cd, dis_info, keyword_table, value, attrs)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     CGEN_KEYWORD *keyword_table;
     long value;
     unsigned int attrs;
{
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_KEYWORD_ENTRY *ke;

  ke = cgen_keyword_lookup_value (keyword_table, value);
  if (ke != NULL)
    (*info->fprintf_func) (info->stream, "%s", ke->name);
  else
    (*info->fprintf_func) (info->stream, "???");
}

/* Default insn printer.

   DIS_INFO is defined as `PTR' so the disassembler needn't know anything
   about disassemble_info.  */

static void
print_insn_normal (cd, dis_info, insn, fields, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     const CGEN_INSN *insn;
     CGEN_FIELDS *fields;
     bfd_vma pc;
     int length;
{
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
  disassemble_info *info = (disassemble_info *) dis_info;
  const unsigned char *syn;

  CGEN_INIT_PRINT (cd);

  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
    {
      if (CGEN_SYNTAX_MNEMONIC_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
	  continue;
	}
      if (CGEN_SYNTAX_CHAR_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
	  continue;
	}

      /* We have an operand.  */
      m32r_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
				 fields, CGEN_INSN_ATTRS (insn), pc, length);
    }
}

/* Utility to print an insn.
   BUF is the base part of the insn, target byte order, BUFLEN bytes long.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occurs fetching data (memory_error_func will have
   been called).  */

static int
print_insn (cd, pc, info, buf, buflen)
     CGEN_CPU_DESC cd;
     bfd_vma pc;
     disassemble_info *info;
     char *buf;
     int buflen;
{
  unsigned long insn_value;
  const CGEN_INSN_LIST *insn_list;
  CGEN_EXTRACT_INFO ex_info;

  ex_info.dis_info = info;
  ex_info.valid = (1 << (cd->base_insn_bitsize / 8)) - 1;
  ex_info.insn_bytes = buf;

  switch (buflen)
    {
    case 1:
      insn_value = buf[0];
      break;
    case 2:
      insn_value = info->endian == BFD_ENDIAN_BIG ? bfd_getb16 (buf) : bfd_getl16 (buf);
      break;
    case 4:
      insn_value = info->endian == BFD_ENDIAN_BIG ? bfd_getb32 (buf) : bfd_getl32 (buf);
      break;
    default:
      abort ();
    }

  /* The instructions are stored in hash lists.
     Pick the first one and keep trying until we find the right one.  */

  insn_list = CGEN_DIS_LOOKUP_INSN (cd, buf, insn_value);
  while (insn_list != NULL)
    {
      const CGEN_INSN *insn = insn_list->insn;
      CGEN_FIELDS fields;
      int length;

#if 0 /* not needed as insn shouldn't be in hash lists if not supported */
      /* Supported by this cpu?  */
      if (! m32r_cgen_insn_supported (cd, insn))
	continue;
#endif

      /* Basic bit mask must be correct.  */
      /* ??? May wish to allow target to defer this check until the extract
	 handler.  */
      if ((insn_value & CGEN_INSN_BASE_MASK (insn))
	  == CGEN_INSN_BASE_VALUE (insn))
	{
	  /* Printing is handled in two passes.  The first pass parses the
	     machine insn and extracts the fields.  The second pass prints
	     them.  */

	  length = CGEN_EXTRACT_FN (cd, insn)
	    (cd, insn, &ex_info, insn_value, &fields, pc);
	  /* length < 0 -> error */
	  if (length < 0)
	    return length;
	  if (length > 0)
	    {
	      CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
	      /* length is in bits, result is in bytes */
	      return length / 8;
	    }
	}

      insn_list = CGEN_DIS_NEXT_INSN (insn_list);
    }

  return 0;
}

/* Default value for CGEN_PRINT_INSN.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occured fetching bytes.  */

#ifndef CGEN_PRINT_INSN
#define CGEN_PRINT_INSN default_print_insn
#endif

static int
default_print_insn (cd, pc, info)
     CGEN_CPU_DESC cd;
     bfd_vma pc;
     disassemble_info *info;
{
  char buf[CGEN_MAX_INSN_SIZE];
  int status;

  /* Read the base part of the insn.  */

  status = (*info->read_memory_func) (pc, buf, cd->base_insn_bitsize / 8, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  return print_insn (cd, pc, info, buf, cd->base_insn_bitsize / 8);
}

/* Main entry point.
   Print one instruction from PC on INFO->STREAM.
   Return the size of the instruction (in bytes).  */

int
print_insn_m32r (pc, info)
     bfd_vma pc;
     disassemble_info *info;
{
  static CGEN_CPU_DESC cd = 0;
  static prev_isa,prev_mach,prev_endian;
  int length;
  int isa,mach;
  int endian = (info->endian == BFD_ENDIAN_BIG
		? CGEN_ENDIAN_BIG
		: CGEN_ENDIAN_LITTLE);
  enum bfd_architecture arch;

  /* ??? gdb will set mach but leave the architecture as "unknown" */
#ifndef CGEN_BFD_ARCH
#define CGEN_BFD_ARCH bfd_arch_m32r
#endif
  arch = info->arch;
  if (arch == bfd_arch_unknown)
    arch = CGEN_BFD_ARCH;
      
  /* There's no standard way to compute the isa number (e.g. for arm thumb)
     so we leave it to the target.  */
#ifdef CGEN_COMPUTE_ISA
  isa = CGEN_COMPUTE_ISA (info);
#else
  isa = 0;
#endif

  mach = info->mach;

  /* If we've switched cpu's, close the current table and open a new one.  */
  if (cd
      && (isa != prev_isa
	  || mach != prev_mach
	  || endian != prev_endian))
    {
      m32r_cgen_cpu_close (cd);
      cd = 0;
    }

  /* If we haven't initialized yet, initialize the opcode table.  */
  if (! cd)
    {
      const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
      const char *mach_name;

      if (!arch_type)
	abort ();
      mach_name = arch_type->printable_name;

      prev_isa = isa;
      prev_mach = mach;
      prev_endian = endian;
      cd = m32r_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
				 CGEN_CPU_OPEN_BFDMACH, mach_name,
				 CGEN_CPU_OPEN_ENDIAN, prev_endian,
				 CGEN_CPU_OPEN_END);
      if (!cd)
	abort ();
      m32r_cgen_init_dis (cd);
    }

  /* We try to have as much common code as possible.
     But at this point some targets need to take over.  */
  /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
     but if not possible try to move this hook elsewhere rather than
     have two hooks.  */
  length = CGEN_PRINT_INSN (cd, pc, info);
  if (length > 0)
    return length;
  if (length < 0)
    return -1;

  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
  return cd->default_insn_bitsize / 8;
}