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/* XSTORMY16 opcode support.  -*- C -*-
   Copyright (C) 2001, 2002, 2005 Red Hat, Inc.
   This file is part of CGEN.  */

/* This file is an addendum to xstormy16.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 */

/* Allows reason codes to be output when assembler errors occur.  */
#define CGEN_VERBOSE_ASSEMBLER_ERRORS

/* We can't use the default hash size because many bits are used by
   operands.  */
#define CGEN_DIS_HASH_SIZE 1
#define CGEN_DIS_HASH(buf, value) 0
/* -- */

/* -- asm.c */

/* The machine-independent code doesn't know how to disambiguate
     mov (foo),r3
   and
     mov (r2),r3
   where 'foo' is a label.  This helps it out. */

static const char *
parse_mem8 (CGEN_CPU_DESC cd,
            const char **strp,
            int opindex,
            unsigned long *valuep)
{
  if (**strp == '(')
    {
      const char *s = *strp;
      
      if (s[1] == '-' && s[2] == '-')
        return _("Bad register in preincrement");

      while (ISALNUM (*++s))
        ;
      if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ','))
        return _("Bad register in postincrement");
      if (s[0] == ',' || s[0] == ')')
        return _("Bad register name");
    }
  else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, 
                               (long *) valuep) == NULL)
    return _("Label conflicts with register name");
  else if (strncasecmp (*strp, "rx,", 3) == 0
           || strncasecmp (*strp, "rxl,", 3) == 0
           || strncasecmp (*strp, "rxh,", 3) == 0)
    return _("Label conflicts with `Rx'");
  else if (**strp == '#')
    return _("Bad immediate expression");
  
  return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
}

/* For the add and subtract instructions, there are two immediate forms,
   one for small operands and one for large ones.  We want to use
   the small one when possible, but we do not want to generate relocs
   of the small size.  This is somewhat tricky.  */
   
static const char *
parse_small_immediate (CGEN_CPU_DESC cd,
                       const char **strp,
                       int opindex,
                       unsigned long *valuep)
{
  bfd_vma value;
  enum cgen_parse_operand_result result;
  const char *errmsg;

  if (**strp == '@')
    return _("No relocation for small immediate");

  errmsg = (* cd->parse_operand_fn)
    (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
     & result, & value);
  
  if (errmsg)
    return errmsg;

  if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER)
    return _("Small operand was not an immediate number");

  *valuep = value;
  return NULL;
}

/* Literal scan be either a normal literal, a @hi() or @lo relocation.  */
   
static const char *
parse_immediate16 (CGEN_CPU_DESC cd,
                   const char **strp,
                   int opindex,
                   unsigned long *valuep)
{
  const char *errmsg;
  enum cgen_parse_operand_result result;
  bfd_reloc_code_real_type code = BFD_RELOC_NONE;
  bfd_vma value;

  if (strncmp (*strp, "@hi(", 4) == 0)
    {
      *strp += 4;
      code = BFD_RELOC_HI16;
    }
  else
  if (strncmp (*strp, "@lo(", 4) == 0)
    {
      *strp += 4;
      code = BFD_RELOC_LO16;
    }

  if (code == BFD_RELOC_NONE)
    errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
  else
    {
      errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value);
      if ((errmsg == NULL) &&
          (result != CGEN_PARSE_OPERAND_RESULT_QUEUED))
        errmsg = _("Operand is not a symbol");

      *valuep = value;
      if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16)
          && **strp == ')')        
        *strp += 1;
      else
        {
          errmsg = _("Syntax error: No trailing ')'");
          return errmsg;
        }
    }
  return errmsg;
}
/* -- */