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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [cpu/] [xstormy16.opc] - Blame information for rev 165

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/* XSTORMY16 opcode support.  -*- C -*-
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   Copyright 2011 Free Software Foundation, Inc.
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   Contributed by Red Hat Inc;
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   This file is part of the GNU Binutils.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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/* This file is an addendum to xstormy16.cpu.  Heavy use of C code isn't
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   appropriate in .cpu files, so it resides here.  This especially applies
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   to assembly/disassembly where parsing/printing can be quite involved.
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   Such things aren't really part of the specification of the cpu, per se,
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   so .cpu files provide the general framework and .opc files handle the
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   nitty-gritty details as necessary.
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   Each section is delimited with start and end markers.
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   -opc.h additions use: "-- opc.h"
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   -opc.c additions use: "-- opc.c"
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   -asm.c additions use: "-- asm.c"
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   -dis.c additions use: "-- dis.c"
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   -ibd.h additions use: "-- ibd.h".  */
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/* -- opc.h */
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/* Allows reason codes to be output when assembler errors occur.  */
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#define CGEN_VERBOSE_ASSEMBLER_ERRORS
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/* We can't use the default hash size because many bits are used by
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   operands.  */
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#define CGEN_DIS_HASH_SIZE 1
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#define CGEN_DIS_HASH(buf, value) 0
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/* -- */
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/* -- asm.c */
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/* The machine-independent code doesn't know how to disambiguate
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     mov (foo),r3
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   and
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     mov (r2),r3
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   where 'foo' is a label.  This helps it out. */
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static const char *
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parse_mem8 (CGEN_CPU_DESC cd,
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            const char **strp,
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            int opindex,
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            unsigned long *valuep)
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{
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  if (**strp == '(')
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    {
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      const char *s = *strp;
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      if (s[1] == '-' && s[2] == '-')
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        return _("Bad register in preincrement");
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      while (ISALNUM (*++s))
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        ;
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      if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ','))
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        return _("Bad register in postincrement");
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      if (s[0] == ',' || s[0] == ')')
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        return _("Bad register name");
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    }
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  else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names,
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                               (long *) valuep) == NULL)
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    return _("Label conflicts with register name");
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  else if (strncasecmp (*strp, "rx,", 3) == 0
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           || strncasecmp (*strp, "rxl,", 3) == 0
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           || strncasecmp (*strp, "rxh,", 3) == 0)
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    return _("Label conflicts with `Rx'");
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  else if (**strp == '#')
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    return _("Bad immediate expression");
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  return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
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}
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/* For the add and subtract instructions, there are two immediate forms,
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   one for small operands and one for large ones.  We want to use
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   the small one when possible, but we do not want to generate relocs
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   of the small size.  This is somewhat tricky.  */
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static const char *
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parse_small_immediate (CGEN_CPU_DESC cd,
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                       const char **strp,
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                       int opindex,
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                       unsigned long *valuep)
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{
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  bfd_vma value;
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  enum cgen_parse_operand_result result;
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  const char *errmsg;
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  if (**strp == '@')
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    return _("No relocation for small immediate");
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  errmsg = (* cd->parse_operand_fn)
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    (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
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     & result, & value);
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  if (errmsg)
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    return errmsg;
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  if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER)
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    return _("Small operand was not an immediate number");
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  *valuep = value;
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  return NULL;
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}
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/* Literal scan be either a normal literal, a @hi() or @lo relocation.  */
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static const char *
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parse_immediate16 (CGEN_CPU_DESC cd,
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                   const char **strp,
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                   int opindex,
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                   unsigned long *valuep)
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{
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  const char *errmsg;
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  enum cgen_parse_operand_result result;
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  bfd_reloc_code_real_type code = BFD_RELOC_NONE;
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  bfd_vma value;
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  if (strncmp (*strp, "@hi(", 4) == 0)
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    {
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      *strp += 4;
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      code = BFD_RELOC_HI16;
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    }
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  else
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  if (strncmp (*strp, "@lo(", 4) == 0)
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    {
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      *strp += 4;
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      code = BFD_RELOC_LO16;
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    }
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  if (code == BFD_RELOC_NONE)
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    errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
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  else
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    {
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      errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value);
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      if ((errmsg == NULL) &&
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          (result != CGEN_PARSE_OPERAND_RESULT_QUEUED))
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        errmsg = _("Operand is not a symbol");
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      *valuep = value;
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      if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16)
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          && **strp == ')')
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        *strp += 1;
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      else
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        {
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          errmsg = _("Syntax error: No trailing ')'");
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          return errmsg;
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        }
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    }
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  return errmsg;
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}
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/* -- */

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