Subversion Repositories openrisc_2011-10-31

/* Assembler interface for targets using CGEN. -*- C -*-

   CGEN: Cpu tools GENerator

   THIS FILE IS MACHINE GENERATED WITH CGEN.

   - the resultant file is machine generated, cgen-asm.in isn't

   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2005, 2007

   Free Software Foundation, Inc.

   This file is part of libopcodes.

   This library 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, or (at your option)

   any later version.

   It 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.  */

/* ??? 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 "bfd.h"

#include "symcat.h"

#include "iq2000-desc.h"

#include "iq2000-opc.h"

#include "opintl.h"

#include "xregex.h"

#include "libiberty.h"

#include "safe-ctype.h"

#undef  min

#define min(a,b) ((a) < (b) ? (a) : (b))

#undef  max

#define max(a,b) ((a) > (b) ? (a) : (b))

static const char * parse_insn_normal

  (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);

/* -- assembler routines inserted here.  */

/* -- asm.c */

#include "safe-ctype.h"

static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");

/* Special check to ensure that instruction exists for given machine.  */

int

iq2000_cgen_insn_supported (CGEN_CPU_DESC cd, const CGEN_INSN *insn)

{

  int machs = cd->machs;

  return (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH) & machs) != 0;

}

static int

iq2000_cgen_isa_register (const char **strp)

{

  int len;

  int ch1, ch2;

  if (**strp == 'r' || **strp == 'R')

    {

      len = strlen (*strp);

      if (len == 2)

        {

          ch1 = (*strp)[1];

          if ('0' <= ch1 && ch1 <= '9')

            return 1;

        }

      else if (len == 3)

        {

          ch1 = (*strp)[1];

          ch2 = (*strp)[2];

          if (('1' <= ch1 && ch1 <= '2') && ('0' <= ch2 && ch2 <= '9'))

            return 1;

          if ('3' == ch1 && (ch2 == '0' || ch2 == '1'))

            return 1;

        }

    }

  if (**strp == '%'

      && TOLOWER ((*strp)[1]) != 'l'

      && TOLOWER ((*strp)[1]) != 'h')

    return 1;

  return 0;

}

/* Handle negated literal.  */

static const char *

parse_mimm (CGEN_CPU_DESC cd,

            const char **strp,

            int opindex,

            unsigned long *valuep)

{

  const char *errmsg;

  /* Verify this isn't a register.  */

  if (iq2000_cgen_isa_register (strp))

    errmsg = _("immediate value cannot be register");

  else

    {

      long value;

      errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);

      if (errmsg == NULL)

        {

          long x = (-value) & 0xFFFF0000;

          if (x != 0 && x != (long) 0xFFFF0000)

            errmsg = _("immediate value out of range");

          else

            *valuep = (-value & 0xFFFF);

        }

    }

  return errmsg;

}

/* Handle signed/unsigned literal.  */

static const char *

parse_imm (CGEN_CPU_DESC cd,

           const char **strp,

           int opindex,

           unsigned long *valuep)

{

  const char *errmsg;

  if (iq2000_cgen_isa_register (strp))

    errmsg = _("immediate value cannot be register");

  else

    {

      long value;

      errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);

      if (errmsg == NULL)

        {

          long x = value & 0xFFFF0000;

          if (x != 0 && x != (long) 0xFFFF0000)

            errmsg = _("immediate value out of range");

          else

            *valuep = (value & 0xFFFF);

        }

    }

  return errmsg;

}

/* Handle iq10 21-bit jmp offset.  */

static const char *

parse_jtargq10 (CGEN_CPU_DESC cd,

                const char **strp,

                int opindex,

                int reloc ATTRIBUTE_UNUSED,

                enum cgen_parse_operand_result *type_addr ATTRIBUTE_UNUSED,

                bfd_vma *valuep)

{

  const char *errmsg;

  bfd_vma value;

  enum cgen_parse_operand_result result_type = CGEN_PARSE_OPERAND_RESULT_NUMBER;

  errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_OFFSET_21,

                               & result_type, & value);

  if (errmsg == NULL && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)

    {

      /* Check value is within 23-bits

         (remembering that 2-bit shift right will occur).  */

      if (value > 0x7fffff)

        return _("21-bit offset out of range");

    }

  *valuep = (value & 0x7FFFFF);

  return errmsg;

}

/* Handle high().  */

static const char *

parse_hi16 (CGEN_CPU_DESC cd,

            const char **strp,

            int opindex,

            unsigned long *valuep)

{

  if (strncasecmp (*strp, "%hi(", 4) == 0)

    {

      enum cgen_parse_operand_result result_type;

      bfd_vma value;

      const char *errmsg;

      *strp += 4;

      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,

                                   & result_type, & value);

      if (**strp != ')')

        return MISSING_CLOSING_PARENTHESIS;

      ++*strp;

      if (errmsg == NULL

          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)

        {

          /* If value has top-bit of %lo on, then it will

             sign-propagate and so we compensate by adding

             1 to the resultant %hi value.  */

          if (value & 0x8000)

            value += 0x10000;

          value >>= 16;

          value &= 0xffff;

        }

      *valuep = value;

      return errmsg;

    }

  /* We add %uhi in case a user just wants the high 16-bits or is using

     an insn like ori for %lo which does not sign-propagate.  */

  if (strncasecmp (*strp, "%uhi(", 5) == 0)

    {

      enum cgen_parse_operand_result result_type;

      bfd_vma value;

      const char *errmsg;

      *strp += 5;

      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_UHI16,

                                   & 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;

    }

  return parse_imm (cd, strp, opindex, valuep);

}

/* Handle %lo in a signed context.

   The signedness of the value doesn't matter to %lo(), but this also

   handles the case where %lo() isn't present.  */

static const char *

parse_lo16 (CGEN_CPU_DESC cd,

            const char **strp,

            int opindex,

            unsigned long *valuep)

{

  if (strncasecmp (*strp, "%lo(", 4) == 0)

    {

      const char *errmsg;

      enum cgen_parse_operand_result result_type;

      bfd_vma value;

      *strp += 4;

      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_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 parse_imm (cd, strp, opindex, valuep);

}

/* Handle %lo in a negated signed context.

   The signedness of the value doesn't matter to %lo(), but this also

   handles the case where %lo() isn't present.  */

static const char *

parse_mlo16 (CGEN_CPU_DESC cd,

             const char **strp,

             int opindex,

             unsigned long *valuep)

{

  if (strncasecmp (*strp, "%lo(", 4) == 0)

    {

      const char *errmsg;

      enum cgen_parse_operand_result result_type;

      bfd_vma value;

      *strp += 4;

      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,

                                   & result_type, & value);

      if (**strp != ')')

        return MISSING_CLOSING_PARENTHESIS;

      ++*strp;

      if (errmsg == NULL

          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)

        value = (-value) & 0xffff;

      *valuep = value;

      return errmsg;

    }

  return parse_mimm (cd, strp, opindex, valuep);

}

/* -- */

const char * iq2000_cgen_parse_operand

  (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);

/* Main entry point for operand parsing.

   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 `parse_insn_normal', but keeping it

   separate makes clear the interface between `parse_insn_normal' and each of

   the handlers.  */

const char *

iq2000_cgen_parse_operand (CGEN_CPU_DESC cd,

                           int opindex,

                           const char ** strp,

                           CGEN_FIELDS * fields)

{

  const char * errmsg = NULL;

  /* Used by scalar operands that still need to be parsed.  */

  long junk ATTRIBUTE_UNUSED;

  switch (opindex)

    {

    case IQ2000_OPERAND__INDEX :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND__INDEX, (unsigned long *) (& fields->f_index));

      break;

    case IQ2000_OPERAND_BASE :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);

      break;

    case IQ2000_OPERAND_BASEOFF :

      {

        bfd_vma value = 0;

        errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_BASEOFF, 0, NULL,  & value);

        fields->f_imm = value;

      }

      break;

    case IQ2000_OPERAND_BITNUM :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BITNUM, (unsigned long *) (& fields->f_rt));

      break;

    case IQ2000_OPERAND_BYTECOUNT :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BYTECOUNT, (unsigned long *) (& fields->f_bytecount));

      break;

    case IQ2000_OPERAND_CAM_Y :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Y, (unsigned long *) (& fields->f_cam_y));

      break;

    case IQ2000_OPERAND_CAM_Z :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Z, (unsigned long *) (& fields->f_cam_z));

      break;

    case IQ2000_OPERAND_CM_3FUNC :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3FUNC, (unsigned long *) (& fields->f_cm_3func));

      break;

    case IQ2000_OPERAND_CM_3Z :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3Z, (unsigned long *) (& fields->f_cm_3z));

      break;

    case IQ2000_OPERAND_CM_4FUNC :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4FUNC, (unsigned long *) (& fields->f_cm_4func));

      break;

    case IQ2000_OPERAND_CM_4Z :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4Z, (unsigned long *) (& fields->f_cm_4z));

      break;

    case IQ2000_OPERAND_COUNT :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_COUNT, (unsigned long *) (& fields->f_count));

      break;

    case IQ2000_OPERAND_EXECODE :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_EXECODE, (unsigned long *) (& fields->f_excode));

      break;

    case IQ2000_OPERAND_HI16 :

      errmsg = parse_hi16 (cd, strp, IQ2000_OPERAND_HI16, (unsigned long *) (& fields->f_imm));

      break;

    case IQ2000_OPERAND_IMM :

      errmsg = parse_imm (cd, strp, IQ2000_OPERAND_IMM, (unsigned long *) (& fields->f_imm));

      break;

    case IQ2000_OPERAND_JMPTARG :

      {

        bfd_vma value = 0;

        errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_JMPTARG, 0, NULL,  & value);

        fields->f_jtarg = value;

      }

      break;

    case IQ2000_OPERAND_JMPTARGQ10 :

      {

        bfd_vma value = 0;

        errmsg = parse_jtargq10 (cd, strp, IQ2000_OPERAND_JMPTARGQ10, 0, NULL,  & value);

        fields->f_jtargq10 = value;

      }

      break;

    case IQ2000_OPERAND_LO16 :

      errmsg = parse_lo16 (cd, strp, IQ2000_OPERAND_LO16, (unsigned long *) (& fields->f_imm));

      break;

    case IQ2000_OPERAND_MASK :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASK, (unsigned long *) (& fields->f_mask));

      break;

    case IQ2000_OPERAND_MASKL :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKL, (unsigned long *) (& fields->f_maskl));

      break;

    case IQ2000_OPERAND_MASKQ10 :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKQ10, (unsigned long *) (& fields->f_maskq10));

      break;

    case IQ2000_OPERAND_MASKR :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKR, (unsigned long *) (& fields->f_rs));

      break;

    case IQ2000_OPERAND_MLO16 :

      errmsg = parse_mlo16 (cd, strp, IQ2000_OPERAND_MLO16, (unsigned long *) (& fields->f_imm));

      break;

    case IQ2000_OPERAND_OFFSET :

      {

        bfd_vma value = 0;

        errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_OFFSET, 0, NULL,  & value);

        fields->f_offset = value;

      }

      break;

    case IQ2000_OPERAND_RD :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd);

      break;

    case IQ2000_OPERAND_RD_RS :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rs);

      break;

    case IQ2000_OPERAND_RD_RT :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rt);

      break;

    case IQ2000_OPERAND_RS :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);

      break;

    case IQ2000_OPERAND_RT :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt);

      break;

    case IQ2000_OPERAND_RT_RS :

      errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt_rs);

      break;

    case IQ2000_OPERAND_SHAMT :

      errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_SHAMT, (unsigned long *) (& fields->f_shamt));

      break;

    default :

      /* xgettext:c-format */

      fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);

      abort ();

  }

  return errmsg;

}

cgen_parse_fn * const iq2000_cgen_parse_handlers[] =

{

  parse_insn_normal,

};

void

iq2000_cgen_init_asm (CGEN_CPU_DESC cd)

{

  iq2000_cgen_init_opcode_table (cd);

  iq2000_cgen_init_ibld_table (cd);

  cd->parse_handlers = & iq2000_cgen_parse_handlers[0];

  cd->parse_operand = iq2000_cgen_parse_operand;

#ifdef CGEN_ASM_INIT_HOOK

CGEN_ASM_INIT_HOOK

#endif

}

/* Regex construction routine.

   This translates an opcode syntax string into a regex string,

   by replacing any non-character syntax element (such as an

   opcode) with the pattern '.*'

   It then compiles the regex and stores it in the opcode, for

   later use by iq2000_cgen_assemble_insn

   Returns NULL for success, an error message for failure.  */

char *

iq2000_cgen_build_insn_regex (CGEN_INSN *insn)

{

  CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);

  const char *mnem = CGEN_INSN_MNEMONIC (insn);

  char rxbuf[CGEN_MAX_RX_ELEMENTS];

  char *rx = rxbuf;

  const CGEN_SYNTAX_CHAR_TYPE *syn;

  int reg_err;

  syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));

  /* Mnemonics come first in the syntax string.  */

  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))

    return _("missing mnemonic in syntax string");

  ++syn;

  /* Generate a case sensitive regular expression that emulates case

     insensitive matching in the "C" locale.  We cannot generate a case

     insensitive regular expression because in Turkish locales, 'i' and 'I'

     are not equal modulo case conversion.  */

  /* Copy the literal mnemonic out of the insn.  */

  for (; *mnem; mnem++)

    {

      char c = *mnem;

      if (ISALPHA (c))

        {

          *rx++ = '[';

          *rx++ = TOLOWER (c);

          *rx++ = TOUPPER (c);

          *rx++ = ']';

        }

      else

        *rx++ = c;

    }

  /* Copy any remaining literals from the syntax string into the rx.  */

  for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)

    {

      if (CGEN_SYNTAX_CHAR_P (* syn))

        {

          char c = CGEN_SYNTAX_CHAR (* syn);

          switch (c)

            {

              /* Escape any regex metacharacters in the syntax.  */

            case '.': case '[': case '\\':

            case '*': case '^': case '$':

#ifdef CGEN_ESCAPE_EXTENDED_REGEX

            case '?': case '{': case '}':

            case '(': case ')': case '*':

            case '|': case '+': case ']':

#endif

              *rx++ = '\\';

              *rx++ = c;

              break;

            default:

              if (ISALPHA (c))

                {

                  *rx++ = '[';

                  *rx++ = TOLOWER (c);

                  *rx++ = TOUPPER (c);

                  *rx++ = ']';

                }

              else

                *rx++ = c;

              break;

            }

        }

      else

        {

          /* Replace non-syntax fields with globs.  */

          *rx++ = '.';

          *rx++ = '*';

        }

    }

  /* Trailing whitespace ok.  */

  * rx++ = '[';

  * rx++ = ' ';

  * rx++ = '\t';

  * rx++ = ']';

  * rx++ = '*';

  /* But anchor it after that.  */

  * rx++ = '$';

  * rx = '\0';

  CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));

  reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);

  if (reg_err == 0)

    return NULL;

  else

    {

      static char msg[80];

      regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);

      regfree ((regex_t *) CGEN_INSN_RX (insn));

      free (CGEN_INSN_RX (insn));

      (CGEN_INSN_RX (insn)) = NULL;

      return msg;

    }

}

/* Default insn parser.

   The syntax string is scanned and operands are parsed and stored in FIELDS.

   Relocs are queued as we go via other callbacks.

   ??? Note that this is currently an all-or-nothing parser.  If we fail to

   parse the instruction, we return 0 and the caller will start over from

   the beginning.  Backtracking will be necessary in parsing subexpressions,

   but that can be handled there.  Not handling backtracking here may get

   expensive in the case of the m68k.  Deal with later.

   Returns NULL for success, an error message for failure.  */

static const char *

parse_insn_normal (CGEN_CPU_DESC cd,

                   const CGEN_INSN *insn,

                   const char **strp,

                   CGEN_FIELDS *fields)

{

  /* ??? Runtime added insns not handled yet.  */

  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);

  const char *str = *strp;

  const char *errmsg;

  const char *p;

  const CGEN_SYNTAX_CHAR_TYPE * syn;

#ifdef CGEN_MNEMONIC_OPERANDS

  /* FIXME: wip */

  int past_opcode_p;

#endif

  /* For now we assume the mnemonic is first (there are no leading operands).

     We can parse it without needing to set up operand parsing.

     GAS's input scrubber will ensure mnemonics are lowercase, but we may

     not be called from GAS.  */

  p = CGEN_INSN_MNEMONIC (insn);

  while (*p && TOLOWER (*p) == TOLOWER (*str))

    ++p, ++str;

  if (* p)

    return _("unrecognized instruction");

#ifndef CGEN_MNEMONIC_OPERANDS

  if (* str && ! ISSPACE (* str))

    return _("unrecognized instruction");

#endif

  CGEN_INIT_PARSE (cd);

  cgen_init_parse_operand (cd);

#ifdef CGEN_MNEMONIC_OPERANDS

  past_opcode_p = 0;

#endif

  /* We don't check for (*str != '\0') here because we want to parse

     any trailing fake arguments in the syntax string.  */