Subversion Repositories openrisc_2011-10-31

/* M32R opcode support.  -*- C -*-

   Copyright 1998, 1999, 2000, 2001, 2004, 2005, 2007, 2009
   Free Software Foundation, Inc.

   Contributed by Red Hat Inc; developed under contract from
   Mitsubishi Electric Corporation.

   This file is part of the GNU Binutils.

   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 3 of the License, 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */


/* This file is an addendum to m32r.cpu.  Heavy use of C code isn't
   appropriate in .cpu files, so it resides here.  This especially applies
   to assembly/disassembly where parsing/printing can be quite involved.
   Such things aren't really part of the specification of the cpu, per se,
   so .cpu files provide the general framework and .opc files handle the
   nitty-gritty details as necessary.

   Each section is delimited with start and end markers.

   <arch>-opc.h additions use: "-- opc.h"
   <arch>-opc.c additions use: "-- opc.c"
   <arch>-asm.c additions use: "-- asm.c"
   <arch>-dis.c additions use: "-- dis.c"
   <arch>-ibd.h additions use: "-- ibd.h"  */

/* -- opc.h */

#undef  CGEN_DIS_HASH_SIZE
#define CGEN_DIS_HASH_SIZE 256
#undef  CGEN_DIS_HASH
#if 0
#define X(b) (((unsigned char *) (b))[0] & 0xf0)
#define CGEN_DIS_HASH(buffer, value) \
(X (buffer) | \
 (X (buffer) == 0x40 || X (buffer) == 0xe0 || X (buffer) == 0x60 || X (buffer) == 0x50 ? 0 \
  : X (buffer) == 0x70 || X (buffer) == 0xf0 ? (((unsigned char *) (buffer))[0] & 0xf) \
  : X (buffer) == 0x30 ? ((((unsigned char *) (buffer))[1] & 0x70) >> 4) \
  : ((((unsigned char *) (buffer))[1] & 0xf0) >> 4)))
#else
#define CGEN_DIS_HASH(buffer, value) m32r_cgen_dis_hash (buffer, value)
extern unsigned int m32r_cgen_dis_hash (const char *, CGEN_INSN_INT);
#endif

/* -- */

/* -- opc.c */
unsigned int
m32r_cgen_dis_hash (const char * buf ATTRIBUTE_UNUSED, CGEN_INSN_INT value)
{
  unsigned int x;

  if (value & 0xffff0000) /* 32bit instructions.  */
    value = (value >> 16) & 0xffff;

  x = (value >> 8) & 0xf0;
  if (x == 0x40 || x == 0xe0 || x == 0x60 || x == 0x50)
    return x;

  if (x == 0x70 || x == 0xf0)
    return x | ((value >> 8) & 0x0f);

  if (x == 0x30)
    return x | ((value & 0x70) >> 4);
  else
    return x | ((value & 0xf0) >> 4);
}

/* -- */

/* -- asm.c */
static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");

/* Handle '#' prefixes (i.e. skip over them).  */

static const char *
parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
            const char **strp,
            int opindex ATTRIBUTE_UNUSED,
            long *valuep ATTRIBUTE_UNUSED)
{
  if (**strp == '#')
    ++*strp;
  return NULL;
}

/* Handle shigh(), high().  */

static const char *
parse_hi16 (CGEN_CPU_DESC cd,
            const char **strp,
            int opindex,
            unsigned long *valuep)
{
  const char *errmsg;
  enum cgen_parse_operand_result result_type;
  bfd_vma value;

  if (**strp == '#')
    ++*strp;

  if (strncasecmp (*strp, "high(", 5) == 0)
    {
      *strp += 5;
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
                                   & result_type, & value);
      if (**strp != ')')
        return MISSING_CLOSING_PARENTHESIS;
      ++*strp;
      if (errmsg == NULL
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
        {
          value >>= 16;
          value &= 0xffff;
        }
      *valuep = value;
      return errmsg;
    }
  else if (strncasecmp (*strp, "shigh(", 6) == 0)
    {
      *strp += 6;
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
                                   & result_type, & value);
      if (**strp != ')')
        return MISSING_CLOSING_PARENTHESIS;
      ++*strp;
      if (errmsg == NULL
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
        {
          value += 0x8000;
          value >>= 16;
          value &= 0xffff;
        }
      *valuep = value;
      return errmsg;
    }

  return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
}

/* Handle low() in a signed context.  Also handle sda().
   The signedness of the value doesn't matter to low(), but this also
   handles the case where low() isn't present.  */

static const char *
parse_slo16 (CGEN_CPU_DESC cd,
             const char ** strp,
             int opindex,
             long * valuep)
{
  const char *errmsg;
  enum cgen_parse_operand_result result_type;
  bfd_vma value;

  if (**strp == '#')
    ++*strp;

  if (strncasecmp (*strp, "low(", 4) == 0)
    {
      *strp += 4;
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
                                   & result_type, & value);
      if (**strp != ')')
        return MISSING_CLOSING_PARENTHESIS;
      ++*strp;
      if (errmsg == NULL
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
        value = ((value & 0xffff) ^ 0x8000) - 0x8000;
      *valuep = value;
      return errmsg;
    }

  if (strncasecmp (*strp, "sda(", 4) == 0)
    {
      *strp += 4;
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
                                   NULL, & value);
      if (**strp != ')')
        return MISSING_CLOSING_PARENTHESIS;
      ++*strp;
      *valuep = value;
      return errmsg;
    }

  return cgen_parse_signed_integer (cd, strp, opindex, valuep);
}

/* Handle low() in an unsigned context.
   The signedness of the value doesn't matter to low(), but this also
   handles the case where low() isn't present.  */

static const char *
parse_ulo16 (CGEN_CPU_DESC cd,
             const char **strp,
             int opindex,
             unsigned long *valuep)
{
  const char *errmsg;
  enum cgen_parse_operand_result result_type;
  bfd_vma value;

  if (**strp == '#')
    ++*strp;

  if (strncasecmp (*strp, "low(", 4) == 0)
    {
      *strp += 4;
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
                                   & result_type, & value);
      if (**strp != ')')
        return MISSING_CLOSING_PARENTHESIS;
      ++*strp;
      if (errmsg == NULL
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
        value &= 0xffff;
      *valuep = value;
      return errmsg;
    }

  return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
}

/* -- */

/* -- 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 (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
            void * dis_info,
            long value ATTRIBUTE_UNUSED,
            unsigned int attrs ATTRIBUTE_UNUSED,
            bfd_vma pc ATTRIBUTE_UNUSED,
            int length ATTRIBUTE_UNUSED)
{
  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 (CGEN_CPU_DESC cd,
               bfd_vma pc,
               disassemble_info *info)
{
  bfd_byte buffer[CGEN_MAX_INSN_SIZE];
  bfd_byte *buf = buffer;
  int status;
  int buflen = (pc & 3) == 0 ? 4 : 2;
  int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
  bfd_byte *x;

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

  status = (*info->read_memory_func) (pc - ((!big_p && (pc & 3) != 0) ? 2 : 0),
                                      buf, buflen, info);
  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

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

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

  x = (big_p ? &buf[0] : &buf[1]);
  if (*x & 0x80)
    {
      /* Parallel.  */
      (*info->fprintf_func) (info->stream, " || ");
      *x &= 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;
}

/* -- */