2007-02-05 Dave Brolley <brolley@redhat.com>

        * mep-*: New support for Toshiba Media Processor (MeP).
        * Makefile.am: Add support for MeP.
        * configure.in: Likewise.
        * disassemble.c: Likewise.
        * Makefile.in: Regenerated.
        * configure: Regenerated.

1 files changed, 1398 insertions, 0 deletions

diff --git a/opcodes/mep-asm.c b/opcodes/mep-asm.c
new file mode 100644
index 00000000000..66f20a7479f
--- /dev/null
+++ b/opcodes/mep-asm.c
@@ -0,0 +1,1398 @@
+/* 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
+   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.,
+   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 "mep-desc.h"
+#include "mep-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 */
+
+#define CGEN_VALIDATE_INSN_SUPPORTED
+
+       const char * parse_csrn       (CGEN_CPU_DESC, const char **, CGEN_KEYWORD *, long *);
+       const char * parse_tpreg      (CGEN_CPU_DESC, const char **, CGEN_KEYWORD *, long *);
+       const char * parse_spreg      (CGEN_CPU_DESC, const char **, CGEN_KEYWORD *, long *);
+       const char * parse_mep_align  (CGEN_CPU_DESC, const char **, enum cgen_operand_type, long *);
+       const char * parse_mep_alignu (CGEN_CPU_DESC, const char **, enum cgen_operand_type, unsigned long *);
+static const char * parse_signed16   (CGEN_CPU_DESC, const char **, int, long *);
+static const char * parse_unsigned16 (CGEN_CPU_DESC, const char **, int, unsigned long *);
+static const char * parse_lo16       (CGEN_CPU_DESC, const char **, int, long *, long);
+static const char * parse_unsigned7  (CGEN_CPU_DESC, const char **, enum cgen_operand_type, unsigned long *);
+static const char * parse_zero       (CGEN_CPU_DESC, const char **, int, long *);
+
+const char *
+parse_csrn (CGEN_CPU_DESC cd, const char **strp,
+	    CGEN_KEYWORD *keyword_table, long *field)
+{
+  const char *err;
+  unsigned long value;
+
+  err = cgen_parse_keyword (cd, strp, keyword_table, field);
+  if (!err)
+    return NULL;
+
+  err = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CSRN_IDX, & value);
+  if (err)
+    return err;
+  *field = value;
+  return NULL;
+}
+
+/* begin-cop-ip-parse-handlers */
+static const char *
+parse_fmax_cr (CGEN_CPU_DESC cd,
+	const char **strp,
+	CGEN_KEYWORD *keyword_table  ATTRIBUTE_UNUSED,
+	long *field)
+{
+  return cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_cr_fmax, field);
+}
+static const char *
+parse_fmax_ccr (CGEN_CPU_DESC cd,
+	const char **strp,
+	CGEN_KEYWORD *keyword_table  ATTRIBUTE_UNUSED,
+	long *field)
+{
+  return cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_ccr_fmax, field);
+}
+/* end-cop-ip-parse-handlers */
+
+const char *
+parse_tpreg (CGEN_CPU_DESC cd, const char ** strp,
+	     CGEN_KEYWORD *keyword_table, long *field)
+{
+  const char *err;
+
+  err = cgen_parse_keyword (cd, strp, keyword_table, field);
+  if (err)
+    return err;
+  if (*field != 13)
+    return _("Only $tp or $13 allowed for this opcode");
+  return NULL;
+}
+
+const char *
+parse_spreg (CGEN_CPU_DESC cd, const char ** strp,
+	     CGEN_KEYWORD *keyword_table, long *field)
+{
+  const char *err;
+
+  err = cgen_parse_keyword (cd, strp, keyword_table, field);
+  if (err)
+    return err;
+  if (*field != 15)
+    return _("Only $sp or $15 allowed for this opcode");
+  return NULL;
+}
+
+const char *
+parse_mep_align (CGEN_CPU_DESC cd, const char ** strp,
+		 enum cgen_operand_type type, long *field)
+{
+  long lsbs = 0;
+  const char *err;
+
+  switch (type)
+    {
+    case MEP_OPERAND_PCREL8A2:
+    case MEP_OPERAND_PCREL12A2:
+    case MEP_OPERAND_PCREL17A2:
+    case MEP_OPERAND_PCREL24A2:
+    case MEP_OPERAND_CDISP8A2:
+    case MEP_OPERAND_CDISP8A4:
+    case MEP_OPERAND_CDISP8A8:
+      err = cgen_parse_signed_integer   (cd, strp, type, field);
+      break;
+    case MEP_OPERAND_PCABS24A2:
+    case MEP_OPERAND_UDISP7:
+    case MEP_OPERAND_UDISP7A2:
+    case MEP_OPERAND_UDISP7A4:
+    case MEP_OPERAND_UIMM7A4:
+    case MEP_OPERAND_ADDR24A4:
+      err = cgen_parse_unsigned_integer (cd, strp, type, (unsigned long *) field);
+      break;
+    default:
+      abort();
+    }
+  if (err)
+    return err;
+  switch (type)
+    {
+    case MEP_OPERAND_UDISP7:
+      lsbs = 0;
+      break;
+    case MEP_OPERAND_PCREL8A2:
+    case MEP_OPERAND_PCREL12A2:
+    case MEP_OPERAND_PCREL17A2:
+    case MEP_OPERAND_PCREL24A2:
+    case MEP_OPERAND_PCABS24A2:
+    case MEP_OPERAND_UDISP7A2:
+    case MEP_OPERAND_CDISP8A2:
+      lsbs = *field & 1;
+      break;
+    case MEP_OPERAND_UDISP7A4:
+    case MEP_OPERAND_UIMM7A4:
+    case MEP_OPERAND_ADDR24A4:
+    case MEP_OPERAND_CDISP8A4:
+      lsbs = *field & 3;
+      break;
+    case MEP_OPERAND_CDISP8A8:
+      lsbs = *field & 7;
+      break;
+    default:
+      /* Safe assumption?  */
+      abort ();
+    }
+  if (lsbs)
+    return "Value is not aligned enough";
+  return NULL;
+}
+
+const char *
+parse_mep_alignu (CGEN_CPU_DESC cd, const char ** strp,
+		 enum cgen_operand_type type, unsigned long *field)
+{
+  return parse_mep_align (cd, strp, type, (long *) field);
+}
+
+
+/* Handle %lo(), %tpoff(), %sdaoff(), %hi(), and other signed
+   constants in a signed context.  */
+
+static const char *
+parse_signed16 (CGEN_CPU_DESC cd,
+		const char **strp,
+		int opindex,
+		long *valuep)
+{
+  return parse_lo16 (cd, strp, opindex, valuep, 1);
+}
+
+static const char *
+parse_lo16 (CGEN_CPU_DESC cd,
+	    const char **strp,
+	    int opindex,
+	    long *valuep,
+	    long signedp)
+{
+  const char *errmsg;
+  enum cgen_parse_operand_result result_type;
+  bfd_vma value;
+
+  if (strncasecmp (*strp, "%lo(", 4) == 0)
+    {
+      *strp += 4;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_LOW16,
+				   & result_type, & value);
+      if (**strp != ')')
+	return _("missing `)'");
+      ++*strp;
+      if (errmsg == NULL
+	  && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
+	value &= 0xffff;
+      if (signedp)
+	*valuep = (long)(short) value;
+      else
+	*valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%hi(", 4) == 0)
+    {
+      *strp += 4;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_HI16S,
+				   & result_type, & value);
+      if (**strp != ')')
+	return _("missing `)'");
+      ++*strp;
+      if (errmsg == NULL
+	  && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
+	value = (value + 0x8000) >> 16;
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%uhi(", 5) == 0)
+    {
+      *strp += 5;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_HI16U,
+				   & result_type, & value);
+      if (**strp != ')')
+	return _("missing `)'");
+      ++*strp;
+      if (errmsg == NULL
+	  && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
+	value = value >> 16;
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%sdaoff(", 8) == 0)
+    {
+      *strp += 8;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_GPREL,
+				   NULL, & value);
+      if (**strp != ')')
+	return _("missing `)'");
+      ++*strp;
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%tpoff(", 7) == 0)
+    {
+      *strp += 7;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_TPREL,
+				   NULL, & value);
+      if (**strp != ')')
+	return _("missing `)'");
+      ++*strp;
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (**strp == '%')
+    return _("invalid %function() here");
+
+  return cgen_parse_signed_integer (cd, strp, opindex, valuep);
+}
+
+static const char *
+parse_unsigned16 (CGEN_CPU_DESC cd,
+		  const char **strp,
+		  int opindex,
+		  unsigned long *valuep)
+{
+  return parse_lo16 (cd, strp, opindex, (long *) valuep, 0);
+}
+
+/* A special case of parse_signed16 which accepts only the value zero.  */
+
+static const char *
+parse_zero (CGEN_CPU_DESC cd, const char **strp, int opindex, long *valuep)
+{
+  const char *errmsg;
+  enum cgen_parse_operand_result result_type;
+  bfd_vma value;
+
+  /*fprintf(stderr, "dj: signed parse opindex `%s'\n", *strp);*/
+
+  /* Prevent ($ry) from being attempted as an expression on 'sw $rx,($ry)'.
+     It will fail and cause ry to be listed as an undefined symbol in the
+     listing.  */
+  if (strncmp (*strp, "($", 2) == 0)
+    return "not zero"; /* any string will do -- will never be seen.  */
+
+  if (strncasecmp (*strp, "%lo(", 4) == 0)
+    {
+      *strp += 4;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_LOW16,
+				   &result_type, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+	  && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+	return "not zero"; /* any string will do -- will never be seen.  */
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%hi(", 4) == 0)
+    {
+      *strp += 4;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_HI16S,
+				   &result_type, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+	  && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+	return "not zero"; /* any string will do -- will never be seen.  */
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%uhi(", 5) == 0)
+    {
+      *strp += 5;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_HI16U,
+				   &result_type, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+	  && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+	return "not zero"; /* any string will do -- will never be seen.  */
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%sdaoff(", 8) == 0)
+    {
+      *strp += 8;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_GPREL,
+				   &result_type, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+	  && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+	return "not zero"; /* any string will do -- will never be seen.  */
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (strncasecmp (*strp, "%tpoff(", 7) == 0)
+    {
+      *strp += 7;
+      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_MEP_TPREL,
+				   &result_type, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      if (errmsg == NULL
+	  && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+	return "not zero"; /* any string will do -- will never be seen.  */
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (**strp == '%')
+    return "invalid %function() here";
+
+  errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_NONE,
+			       &result_type, &value);
+  if (errmsg == NULL
+      && (result_type != CGEN_PARSE_OPERAND_RESULT_NUMBER || value != 0))
+    return "not zero"; /* any string will do -- will never be seen.  */
+
+  return errmsg;
+}
+
+static const char *
+parse_unsigned7 (CGEN_CPU_DESC cd, const char **strp,
+		 enum cgen_operand_type opindex, unsigned long *valuep)
+{
+  const char *errmsg;
+  bfd_vma value;
+
+  /* fprintf(stderr, "dj: unsigned7 parse `%s'\n", *strp); */
+
+  if (strncasecmp (*strp, "%tpoff(", 7) == 0)
+    {
+      int reloc;
+      *strp += 7;
+      switch (opindex)
+	{
+	case MEP_OPERAND_UDISP7:
+	  reloc = BFD_RELOC_MEP_TPREL7;
+	  break;
+	case MEP_OPERAND_UDISP7A2:
+	  reloc = BFD_RELOC_MEP_TPREL7A2;
+	  break;
+	case MEP_OPERAND_UDISP7A4:
+	  reloc = BFD_RELOC_MEP_TPREL7A4;
+	  break;
+	default:
+	  /* Safe assumption?  */
+	  abort (); 
+	}
+      errmsg = cgen_parse_address (cd, strp, opindex, reloc,
+				   NULL, &value);
+      if (**strp != ')')
+	return "missing `)'";
+      ++*strp;
+      *valuep = value;
+      return errmsg;
+    }
+
+  if (**strp == '%')
+    return _("invalid %function() here");
+
+  return parse_mep_alignu (cd, strp, opindex, valuep);
+}
+
+/* BEGIN LIGHTWEIGHT MACRO PROCESSOR.  */
+
+#define MAXARGS 9
+
+typedef struct
+{
+  char *name;
+  char *expansion;
+}  macro;
+
+typedef struct
+{
+  const char *start;
+  int len;
+} arg;
+
+macro macros[] =
+{
+  { "sizeof", "(`1.end + (- `1))"},
+  { "startof", "(`1 | 0)" },
+  { "align4", "(`1&(~3))"},
+/*{ "hi", "(((`1+0x8000)>>16) & 0xffff)" },  */
+/*{ "lo", "(`1 & 0xffff)" },  */
+/*{ "sdaoff", "((`1-__sdabase) & 0x7f)"},  */
+/*{ "tpoff", "((`1-__tpbase) & 0x7f)"},  */
+  { 0,0 }
+};
+
+static char  * expand_string    (const char *, int);
+
+static const char *
+mep_cgen_expand_macros_and_parse_operand
+  (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
+
+static char *
+str_append (char *dest, const char *input, int len)
+{  
+  char *new_dest;
+  int oldlen;
+
+  if (len == 0)
+    return dest;
+  /* printf("str_append: <<%s>>, <<%s>>, %d\n", dest, input, len); */
+  oldlen = (dest ? strlen(dest) : 0);
+  new_dest = realloc (dest, oldlen + len + 1);
+  memset (new_dest + oldlen, 0, len + 1);
+  return strncat (new_dest, input, len);
+}
+
+static macro *
+lookup_macro (const char *name)
+{
+  macro *m;
+
+  for (m = macros; m->name; ++m)
+    if (strncmp (m->name, name, strlen(m->name)) == 0)
+      return m;
+
+  return 0;
+}
+
+static char *
+expand_macro (arg *args, int narg, macro *mac)
+{
+  char *result = 0, *rescanned_result = 0;
+  char *e = mac->expansion;
+  char *mark = e;
+  int arg = 0;
+
+  /*  printf("expanding macro %s with %d args\n", mac->name, narg + 1); */
+  while (*e)
+    {
+      if (*e == '`' && 
+	  (*e+1) && 
+	  ((*(e + 1) - '1') <= MAXARGS) &&
+	  ((*(e + 1) - '1') <= narg))
+	{
+	  result = str_append (result, mark, e - mark);
+	  arg = (*(e + 1) - '1');
+	  /* printf("replacing `%d with %s\n", arg+1, args[arg].start); */
+	  result = str_append (result, args[arg].start, args[arg].len);
+	  ++e;
+	  mark = e+1;
+	}
+      ++e;
+    }
+
+  if (mark != e)
+    result = str_append (result, mark, e - mark);
+
+  if (result)
+    {
+      rescanned_result = expand_string (result, 0);
+      free (result);
+      return rescanned_result;
+    }
+  else 
+    return result;
+}
+
+#define IN_TEXT 0
+#define IN_ARGS 1
+
+static char *
+expand_string (const char *in, int first_only)
+{
+  int num_expansions = 0;
+  int depth = 0;
+  int narg = -1;
+  arg args[MAXARGS];
+  int state = IN_TEXT;
+  const char *mark = in;
+  macro *macro = 0;
+
+  char *expansion = 0;
+  char *result = 0;
+
+  while (*in)
+    {
+      switch (state)
+	{
+	case IN_TEXT:
+	  if (*in == '%' && *(in + 1) && (!first_only || num_expansions == 0)) 
+	    {	      
+	      macro = lookup_macro (in + 1);
+	      if (macro)
+		{
+		  /* printf("entering state %d at '%s'...\n", state, in); */
+		  result = str_append (result, mark, in - mark);
+		  mark = in;
+		  in += 1 + strlen (macro->name);
+		  while (*in == ' ') ++in;
+		  if (*in != '(')
+		    {
+		      state = IN_TEXT;		      
+		      macro = 0;
+		    }
+		  else
+		    {
+		      state = IN_ARGS;
+		      narg = 0;
+		      args[narg].start = in + 1;
+		      args[narg].len = 0;
+		      mark = in + 1;	      		      
+		    }
+		}
+	    }
+	  break;
+	case IN_ARGS:
+	  if (depth == 0)
+	    {
+	      switch (*in)
+		{
+		case ',':
+		  narg++;
+		  args[narg].start = (in + 1);
+		  args[narg].len = 0;
+		  break;
+		case ')':
+		  state = IN_TEXT;
+		  /* printf("entering state %d at '%s'...\n", state, in); */
+		  if (macro)
+		    {
+		      expansion = 0;
+		      expansion = expand_macro (args, narg, macro);
+		      num_expansions++;
+		      if (expansion)
+			{
+			  result = str_append (result, expansion, strlen (expansion));
+			  free (expansion);
+			}
+		    }
+		  else
+		    {
+		      result = str_append (result, mark, in - mark);
+		    }
+		  macro = 0;
+		  mark = in + 1;
+		  break;
+		case '(':
+		  depth++;
+		default:
+		  args[narg].len++;
+		  break;		  
+		}
+	    } 
+	  else
+	    {
+	      if (*in == ')')
+		depth--;
+	      if (narg > -1)
+		args[narg].len++;
+	    }
+	  
+	}
+      ++in;
+    }
+  
+  if (mark != in)
+    result = str_append (result, mark, in - mark);
+  
+  return result;
+}
+
+#undef IN_ARGS
+#undef IN_TEXT
+#undef MAXARGS
+
+
+/* END LIGHTWEIGHT MACRO PROCESSOR.  */
+
+const char * mep_cgen_parse_operand
+  (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
+
+const char *
+mep_cgen_expand_macros_and_parse_operand (CGEN_CPU_DESC cd, int opindex,
+					  const char ** strp_in, CGEN_FIELDS * fields)
+{
+  const char * errmsg = NULL;
+  char *str = 0, *hold = 0;
+  const char **strp = 0;
+
+  /* Set up a new pointer to macro-expanded string.  */
+  str = expand_string (*strp_in, 1);
+  /* fprintf (stderr, " expanded <<%s>> to <<%s>>\n", *strp_in, str); */
+
+  hold = str;
+  strp = (const char **)(&str);
+
+  errmsg = mep_cgen_parse_operand (cd, opindex, strp, fields);
+
+  /* Now work out the advance.  */
+  if (strlen (str) == 0)
+    *strp_in += strlen (*strp_in);
+
+  else
+    {
+      if (strstr (*strp_in, str))
+	/* A macro-expansion was pulled off the front.  */
+	*strp_in = strstr (*strp_in, str);  
+      else
+	/* A non-macro-expansion was pulled off the front.  */
+	*strp_in += (str - hold); 
+    }
+
+  if (hold)
+    free (hold);
+
+  return errmsg;
+}
+
+#define CGEN_ASM_INIT_HOOK (cd->parse_operand = mep_cgen_expand_macros_and_parse_operand); 
+
+/* -- dis.c */
+
+const char * mep_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 *
+mep_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 MEP_OPERAND_ADDR24A4 :
+      errmsg = parse_mep_alignu (cd, strp, MEP_OPERAND_ADDR24A4, (unsigned long *) (& fields->f_24u8a4n));
+      break;
+    case MEP_OPERAND_CALLNUM :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CALLNUM, (unsigned long *) (& fields->f_callnum));
+      break;
+    case MEP_OPERAND_CCCC :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CCCC, (unsigned long *) (& fields->f_rm));
+      break;
+    case MEP_OPERAND_CCRN :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_ccr, & fields->f_ccrn);
+      break;
+    case MEP_OPERAND_CDISP8 :
+      errmsg = cgen_parse_signed_integer (cd, strp, MEP_OPERAND_CDISP8, (long *) (& fields->f_8s24));
+      break;
+    case MEP_OPERAND_CDISP8A2 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_CDISP8A2, (long *) (& fields->f_8s24a2));
+      break;
+    case MEP_OPERAND_CDISP8A4 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_CDISP8A4, (long *) (& fields->f_8s24a4));
+      break;
+    case MEP_OPERAND_CDISP8A8 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_CDISP8A8, (long *) (& fields->f_8s24a8));
+      break;
+    case MEP_OPERAND_CIMM4 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CIMM4, (unsigned long *) (& fields->f_rn));
+      break;
+    case MEP_OPERAND_CIMM5 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CIMM5, (unsigned long *) (& fields->f_5u24));
+      break;
+    case MEP_OPERAND_CODE16 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CODE16, (unsigned long *) (& fields->f_16u16));
+      break;
+    case MEP_OPERAND_CODE24 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CODE24, (unsigned long *) (& fields->f_24u4n));
+      break;
+    case MEP_OPERAND_CP_FLAG :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_ccr, & junk);
+      break;
+    case MEP_OPERAND_CRN :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_cr, & fields->f_crn);
+      break;
+    case MEP_OPERAND_CRN64 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_cr64, & fields->f_crn);
+      break;
+    case MEP_OPERAND_CRNX :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_cr, & fields->f_crnx);
+      break;
+    case MEP_OPERAND_CRNX64 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_cr64, & fields->f_crnx);
+      break;
+    case MEP_OPERAND_CSRN :
+      errmsg = parse_csrn (cd, strp, & mep_cgen_opval_h_csr, & fields->f_csrn);
+      break;
+    case MEP_OPERAND_CSRN_IDX :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_CSRN_IDX, (unsigned long *) (& fields->f_csrn));
+      break;
+    case MEP_OPERAND_DBG :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_DEPC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_EPC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_EXC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_FMAX_CCRN :
+      errmsg = parse_fmax_ccr (cd, strp, & mep_cgen_opval_h_ccr, & fields->f_fmax_4_4);
+      break;
+    case MEP_OPERAND_FMAX_FRD :
+      errmsg = parse_fmax_cr (cd, strp, & mep_cgen_opval_h_cr, & fields->f_fmax_frd);
+      break;
+    case MEP_OPERAND_FMAX_FRD_INT :
+      errmsg = parse_fmax_cr (cd, strp, & mep_cgen_opval_h_cr, & fields->f_fmax_frd);
+      break;
+    case MEP_OPERAND_FMAX_FRM :
+      errmsg = parse_fmax_cr (cd, strp, & mep_cgen_opval_h_cr, & fields->f_fmax_frm);
+      break;
+    case MEP_OPERAND_FMAX_FRN :
+      errmsg = parse_fmax_cr (cd, strp, & mep_cgen_opval_h_cr, & fields->f_fmax_frn);
+      break;
+    case MEP_OPERAND_FMAX_FRN_INT :
+      errmsg = parse_fmax_cr (cd, strp, & mep_cgen_opval_h_cr, & fields->f_fmax_frn);
+      break;
+    case MEP_OPERAND_FMAX_RM :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_fmax_rm);
+      break;
+    case MEP_OPERAND_HI :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_LO :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_LP :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_MB0 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_MB1 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_ME0 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_ME1 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_NPC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_OPT :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_PCABS24A2 :
+      errmsg = parse_mep_alignu (cd, strp, MEP_OPERAND_PCABS24A2, (unsigned long *) (& fields->f_24u5a2n));
+      break;
+    case MEP_OPERAND_PCREL12A2 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_PCREL12A2, (long *) (& fields->f_12s4a2));
+      break;
+    case MEP_OPERAND_PCREL17A2 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_PCREL17A2, (long *) (& fields->f_17s16a2));
+      break;
+    case MEP_OPERAND_PCREL24A2 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_PCREL24A2, (long *) (& fields->f_24s5a2n));
+      break;
+    case MEP_OPERAND_PCREL8A2 :
+      errmsg = parse_mep_align (cd, strp, MEP_OPERAND_PCREL8A2, (long *) (& fields->f_8s8a2));
+      break;
+    case MEP_OPERAND_PSW :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_R0 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_R1 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_RL :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rl);
+      break;
+    case MEP_OPERAND_RM :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rm);
+      break;
+    case MEP_OPERAND_RMA :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rm);
+      break;
+    case MEP_OPERAND_RN :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RN3 :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3C :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3L :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3S :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3UC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3UL :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RN3US :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn3);
+      break;
+    case MEP_OPERAND_RNC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RNL :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RNS :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RNUC :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RNUL :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_RNUS :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & fields->f_rn);
+      break;
+    case MEP_OPERAND_SAR :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_csr, & junk);
+      break;
+    case MEP_OPERAND_SDISP16 :
+      errmsg = parse_signed16 (cd, strp, MEP_OPERAND_SDISP16, (long *) (& fields->f_16s16));
+      break;
+    case MEP_OPERAND_SIMM16 :
+      errmsg = parse_signed16 (cd, strp, MEP_OPERAND_SIMM16, (long *) (& fields->f_16s16));
+      break;
+    case MEP_OPERAND_SIMM6 :
+      errmsg = cgen_parse_signed_integer (cd, strp, MEP_OPERAND_SIMM6, (long *) (& fields->f_6s8));
+      break;
+    case MEP_OPERAND_SIMM8 :
+      errmsg = cgen_parse_signed_integer (cd, strp, MEP_OPERAND_SIMM8, (long *) (& fields->f_8s8));
+      break;
+    case MEP_OPERAND_SP :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_SPR :
+      errmsg = parse_spreg (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_TP :
+      errmsg = cgen_parse_keyword (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_TPR :
+      errmsg = parse_tpreg (cd, strp, & mep_cgen_opval_h_gpr, & junk);
+      break;
+    case MEP_OPERAND_UDISP2 :
+      errmsg = cgen_parse_signed_integer (cd, strp, MEP_OPERAND_UDISP2, (long *) (& fields->f_2u6));
+      break;
+    case MEP_OPERAND_UDISP7 :
+      errmsg = parse_unsigned7 (cd, strp, MEP_OPERAND_UDISP7, (unsigned long *) (& fields->f_7u9));
+      break;
+    case MEP_OPERAND_UDISP7A2 :
+      errmsg = parse_unsigned7 (cd, strp, MEP_OPERAND_UDISP7A2, (unsigned long *) (& fields->f_7u9a2));
+      break;
+    case MEP_OPERAND_UDISP7A4 :
+      errmsg = parse_unsigned7 (cd, strp, MEP_OPERAND_UDISP7A4, (unsigned long *) (& fields->f_7u9a4));
+      break;
+    case MEP_OPERAND_UIMM16 :
+      errmsg = parse_unsigned16 (cd, strp, MEP_OPERAND_UIMM16, (unsigned long *) (& fields->f_16u16));
+      break;
+    case MEP_OPERAND_UIMM2 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_UIMM2, (unsigned long *) (& fields->f_2u10));
+      break;
+    case MEP_OPERAND_UIMM24 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_UIMM24, (unsigned long *) (& fields->f_24u8n));
+      break;
+    case MEP_OPERAND_UIMM3 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_UIMM3, (unsigned long *) (& fields->f_3u5));
+      break;
+    case MEP_OPERAND_UIMM4 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_UIMM4, (unsigned long *) (& fields->f_4u8));
+      break;
+    case MEP_OPERAND_UIMM5 :
+      errmsg = cgen_parse_unsigned_integer (cd, strp, MEP_OPERAND_UIMM5, (unsigned long *) (& fields->f_5u8));
+      break;
+    case MEP_OPERAND_UIMM7A4 :
+      errmsg = parse_mep_alignu (cd, strp, MEP_OPERAND_UIMM7A4, (unsigned long *) (& fields->f_7u9a4));
+      break;
+    case MEP_OPERAND_ZERO :
+      errmsg = parse_zero (cd, strp, MEP_OPERAND_ZERO, (long *) (& junk));
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
+      abort ();
+  }
+
+  return errmsg;
+}
+
+cgen_parse_fn * const mep_cgen_parse_handlers[] = 
+{
+  parse_insn_normal,
+};
+
+void
+mep_cgen_init_asm (CGEN_CPU_DESC cd)
+{
+  mep_cgen_init_opcode_table (cd);
+  mep_cgen_init_ibld_table (cd);
+  cd->parse_handlers = & mep_cgen_parse_handlers[0];
+  cd->parse_operand = mep_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 mep_cgen_assemble_insn
+
+   Returns NULL for success, an error message for failure.  */
+
+char * 
+mep_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.  */
+  syn = CGEN_SYNTAX_STRING (syntax);
+
+  /* Mnemonics come first for now, ensure valid string.  */
+  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
+    abort ();
+
+  ++syn;
+
+  while (* syn != 0)
+    {
+      /* Non operand chars must match exactly.  */
+      if (CGEN_SYNTAX_CHAR_P (* syn))
+	{
+	  /* FIXME: While we allow for non-GAS callers above, we assume the
+	     first char after the mnemonic part is a space.  */
+	  /* FIXME: We also take inappropriate advantage of the fact that
+	     GAS's input scrubber will remove extraneous blanks.  */
+	  if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
+	    {
+#ifdef CGEN_MNEMONIC_OPERANDS
+	      if (CGEN_SYNTAX_CHAR(* syn) == ' ')
+		past_opcode_p = 1;
+#endif
+	      ++ syn;
+	      ++ str;
+	    }
+	  else if (*str)
+	    {
+	      /* Syntax char didn't match.  Can't be this insn.  */
+	      static char msg [80];
+
+	      /* xgettext:c-format */
+	      sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
+		       CGEN_SYNTAX_CHAR(*syn), *str);
+	      return msg;
+	    }
+	  else
+	    {
+	      /* Ran out of input.  */
+	      static char msg [80];
+
+	      /* xgettext:c-format */
+	      sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
+		       CGEN_SYNTAX_CHAR(*syn));
+	      return msg;
+	    }
+	  continue;
+	}
+
+      /* We have an operand of some sort.  */
+      errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
+					  &str, fields);
+      if (errmsg)
+	return errmsg;
+
+      /* Done with this operand, continue with next one.  */
+      ++ syn;
+    }
+
+  /* If we're at the end of the syntax string, we're done.  */
+  if (* syn == 0)
+    {
+      /* FIXME: For the moment we assume a valid `str' can only contain
+	 blanks now.  IE: We needn't try again with a longer version of
+	 the insn and it is assumed that longer versions of insns appear
+	 before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
+      while (ISSPACE (* str))
+	++ str;
+
+      if (* str != '\0')
+	return _("junk at end of line"); /* FIXME: would like to include `str' */
+
+      return NULL;
+    }
+
+  /* We couldn't parse it.  */
+  return _("unrecognized instruction");
+}
+
+/* Main entry point.
+   This routine is called for each instruction to be assembled.
+   STR points to the insn to be assembled.
+   We assume all necessary tables have been initialized.
+   The assembled instruction, less any fixups, is stored in BUF.
+   Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
+   still needs to be converted to target byte order, otherwise BUF is an array
+   of bytes in target byte order.
+   The result is a pointer to the insn's entry in the opcode table,
+   or NULL if an error occured (an error message will have already been
+   printed).
+
+   Note that when processing (non-alias) macro-insns,
+   this function recurses.
+
+   ??? It's possible to make this cpu-independent.
+   One would have to deal with a few minor things.
+   At this point in time doing so would be more of a curiosity than useful
+   [for example this file isn't _that_ big], but keeping the possibility in
+   mind helps keep the design clean.  */
+
+const CGEN_INSN *
+mep_cgen_assemble_insn (CGEN_CPU_DESC cd,
+			   const char *str,
+			   CGEN_FIELDS *fields,
+			   CGEN_INSN_BYTES_PTR buf,
+			   char **errmsg)
+{
+  const char *start;
+  CGEN_INSN_LIST *ilist;
+  const char *parse_errmsg = NULL;
+  const char *insert_errmsg = NULL;
+  int recognized_mnemonic = 0;
+
+  /* Skip leading white space.  */
+  while (ISSPACE (* str))
+    ++ str;
+
+  /* The instructions are stored in hashed lists.
+     Get the first in the list.  */
+  ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
+
+  /* Keep looking until we find a match.  */
+  start = str;
+  for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
+    {
+      const CGEN_INSN *insn = ilist->insn;
+      recognized_mnemonic = 1;
+
+#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
+      /* Not usually needed as unsupported opcodes
+	 shouldn't be in the hash lists.  */
+      /* Is this insn supported by the selected cpu?  */
+      if (! mep_cgen_insn_supported (cd, insn))
+	continue;
+#endif
+      /* If the RELAXED attribute is set, this is an insn that shouldn't be
+	 chosen immediately.  Instead, it is used during assembler/linker
+	 relaxation if possible.  */
+      if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
+	continue;
+
+      str = start;
+
+      /* Skip this insn if str doesn't look right lexically.  */
+      if (CGEN_INSN_RX (insn) != NULL &&
+	  regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
+	continue;
+
+      /* Allow parse/insert handlers to obtain length of insn.  */
+      CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
+
+      parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
+      if (parse_errmsg != NULL)
+	continue;
+
+      /* ??? 0 is passed for `pc'.  */
+      insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
+						 (bfd_vma) 0);
+      if (insert_errmsg != NULL)
+        continue;
+
+      /* It is up to the caller to actually output the insn and any
+         queued relocs.  */
+      return insn;
+    }
+
+  {
+    static char errbuf[150];
+#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
+    const char *tmp_errmsg;
+
+    /* If requesting verbose error messages, use insert_errmsg.
+       Failing that, use parse_errmsg.  */
+    tmp_errmsg = (insert_errmsg ? insert_errmsg :
+		  parse_errmsg ? parse_errmsg :
+		  recognized_mnemonic ?
+		  _("unrecognized form of instruction") :
+		  _("unrecognized instruction"));
+
+    if (strlen (start) > 50)
+      /* xgettext:c-format */
+      sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
+    else 
+      /* xgettext:c-format */
+      sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
+#else
+    if (strlen (start) > 50)
+      /* xgettext:c-format */
+      sprintf (errbuf, _("bad instruction `%.50s...'"), start);
+    else 
+      /* xgettext:c-format */
+      sprintf (errbuf, _("bad instruction `%.50s'"), start);
+#endif
+      
+    *errmsg = errbuf;
+    return NULL;
+  }
+}