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, 1205 insertions, 0 deletions

diff --git a/opcodes/mep-dis.c b/opcodes/mep-dis.c
new file mode 100644
index 0000000..769a80a
--- /dev/null
+++ b/opcodes/mep-dis.c
@@ -0,0 +1,1205 @@
+/* Disassembler interface for targets using CGEN. -*- C -*-
+   CGEN: Cpu tools GENerator
+
+   THIS FILE IS MACHINE GENERATED WITH CGEN.
+   - the resultant file is machine generated, cgen-dis.in isn't
+
+   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 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 "dis-asm.h"
+#include "bfd.h"
+#include "symcat.h"
+#include "libiberty.h"
+#include "mep-desc.h"
+#include "mep-opc.h"
+#include "opintl.h"
+
+/* Default text to print if an instruction isn't recognized.  */
+#define UNKNOWN_INSN_MSG _("*unknown*")
+
+static void print_normal
+  (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
+static void print_address
+  (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
+static void print_keyword
+  (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
+static void print_insn_normal
+  (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
+static int print_insn
+  (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
+static int default_print_insn
+  (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
+static int read_insn
+  (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
+   unsigned long *);
+
+/* -- disassembler routines inserted here.  */
+
+/* -- dis.c */
+
+#include "elf/mep.h"
+#include "elf-bfd.h"
+
+#define CGEN_VALIDATE_INSN_SUPPORTED
+
+static void print_tpreg (CGEN_CPU_DESC, PTR, CGEN_KEYWORD *, long, unsigned int);
+static void print_spreg (CGEN_CPU_DESC, PTR, CGEN_KEYWORD *, long, unsigned int);
+
+static void
+print_tpreg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, PTR dis_info,
+	     CGEN_KEYWORD *table ATTRIBUTE_UNUSED, long val ATTRIBUTE_UNUSED,
+	     unsigned int flags ATTRIBUTE_UNUSED)
+{
+  disassemble_info *info = (disassemble_info *) dis_info;
+
+  (*info->fprintf_func) (info->stream, "$tp");
+}
+
+static void
+print_spreg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED, PTR dis_info, 
+	     CGEN_KEYWORD *table ATTRIBUTE_UNUSED, long val ATTRIBUTE_UNUSED,
+	     unsigned int flags ATTRIBUTE_UNUSED)
+{
+  disassemble_info *info = (disassemble_info *) dis_info;
+
+  (*info->fprintf_func) (info->stream, "$sp");
+}
+
+/* begin-cop-ip-print-handlers */
+static void
+print_fmax_cr (CGEN_CPU_DESC cd,
+	void *dis_info,
+	CGEN_KEYWORD *keyword_table ATTRIBUTE_UNUSED,
+	long value,
+	unsigned int attrs)
+{
+  print_keyword (cd, dis_info, & mep_cgen_opval_h_cr_fmax, value, attrs);
+}
+static void
+print_fmax_ccr (CGEN_CPU_DESC cd,
+	void *dis_info,
+	CGEN_KEYWORD *keyword_table ATTRIBUTE_UNUSED,
+	long value,
+	unsigned int attrs)
+{
+  print_keyword (cd, dis_info, & mep_cgen_opval_h_ccr_fmax, value, attrs);
+}
+/* end-cop-ip-print-handlers */
+
+/************************************************************\
+*********************** Experimental *************************
+\************************************************************/
+
+#undef  CGEN_PRINT_INSN
+#define CGEN_PRINT_INSN mep_print_insn
+
+static int
+mep_print_vliw_insns (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info,
+		      bfd_byte *buf, int corelength, int copro1length,
+		      int copro2length ATTRIBUTE_UNUSED)
+{
+  int i;
+  int status = 0;
+  /* char insnbuf[CGEN_MAX_INSN_SIZE]; */
+  bfd_byte insnbuf[64];
+
+  /* If corelength > 0 then there is a core insn present. It
+     will be at the beginning of the buffer.  After printing
+     the core insn, we need to print the + on the next line.  */
+  if (corelength > 0)
+    {
+      int my_status = 0;
+	 
+      for (i = 0; i < corelength; i++ )
+	insnbuf[i] = buf[i];
+      cd->isas = & MEP_CORE_ISA;
+	 
+      my_status = print_insn (cd, pc, info, insnbuf, corelength);
+      if (my_status != corelength)
+	{
+	  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
+	  my_status = corelength;
+	}
+      status += my_status;
+
+      /* Print the + to indicate that the following copro insn is   */
+      /* part of a vliw group.                                      */
+      if (copro1length > 0)
+	(*info->fprintf_func) (info->stream, " + "); 
+    }
+
+  /* Now all that is left to be processed is the coprocessor insns
+     In vliw mode, there will always be one.  Its positioning will
+     be from byte corelength to byte corelength+copro1length -1.
+     No need to check for existence.   Also, the first vliw insn,
+     will, as spec'd, always be at least as long as the core insn
+     so we don't need to flush the buffer.  */
+  if (copro1length > 0)
+    {
+      int my_status = 0;
+	 
+      for (i = corelength; i < corelength + copro1length; i++ )
+	insnbuf[i - corelength] = buf[i];
+
+      switch (copro1length)
+	{
+	case 0:
+	  break;
+	case 2:
+	  cd->isas = & MEP_COP16_ISA;
+	  break;
+	case 4:
+	  cd->isas = & MEP_COP32_ISA;
+	  break;
+	case 6:
+	  cd->isas = & MEP_COP48_ISA;
+	  break;
+	case 8:
+	  cd->isas = & MEP_COP64_ISA;
+	  break; 
+	default:
+	  /* Shouldn't be anything but 16,32,48,64.  */
+	  break;
+	}
+
+      my_status = print_insn (cd, pc, info, insnbuf, copro1length);
+
+      if (my_status != copro1length)
+	{
+	  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
+	  my_status = copro1length;
+	}
+      status += my_status;
+    }
+
+#if 0
+  /* Now we need to process the second copro insn if it exists. We
+     have no guarantee that the second copro insn will be longer
+     than the first, so we have to flush the buffer if we are have
+     a second copro insn to process.  If present, this insn will
+     be in the position from byte corelength+copro1length to byte
+     corelength+copro1length+copro2length-1 (which better equal 8
+     or else we're in big trouble.  */
+  if (copro2length > 0)
+    {
+      int my_status = 0;
+
+      for (i = 0; i < 64 ; i++)
+	insnbuf[i] = 0;
+
+      for (i = corelength + copro1length; i < 64; i++)
+	insnbuf[i - (corelength + copro1length)] = buf[i];
+      
+      switch (copro2length)
+	{
+	case 2:
+	  cd->isas = 1 << ISA_EXT_COP1_16;
+	  break;
+	case 4:
+	  cd->isas = 1 << ISA_EXT_COP1_32;
+	  break;
+	case 6:
+	  cd->isas = 1 << ISA_EXT_COP1_48;
+	  break;
+	case 8:
+	  cd->isas = 1 << ISA_EXT_COP1_64; 
+	  break;
+	default:
+	  /* Shouldn't be anything but 16,32,48,64.  */
+	  break;
+	}
+
+      my_status = print_insn (cd, pc, info, insnbuf, copro2length);
+
+      if (my_status != copro2length)
+	{
+	  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
+	  my_status = copro2length;
+	}
+
+      status += my_status;
+    }
+#endif
+
+  /* Status should now be the number of bytes that were printed
+     which should be 4 for VLIW32 mode and 64 for VLIW64 mode.  */
+
+  if ((!MEP_VLIW64 && (status != 4)) || (MEP_VLIW64 && (status != 8)))
+    return -1;
+  else
+    return status;
+}
+
+/* The two functions mep_examine_vliw[32,64]_insns are used find out 
+   which vliw combinaion (16 bit core with 48 bit copro, 32 bit core 
+   with 32 bit copro, etc.) is present.  Later on, when internally   
+   parallel coprocessors are handled, only these functions should    
+   need to be changed.                                               
+
+   At this time only the following combinations are supported: 
+   
+   VLIW32 Mode:
+   16 bit core insn (core) and 16 bit coprocessor insn (cop1)
+   32 bit core insn (core)
+   32 bit coprocessor insn (cop1)
+   Note: As of this time, I do not believe we have enough information
+         to distinguish a 32 bit core insn from a 32 bit cop insn. Also,
+         no 16 bit coprocessor insns have been specified.  
+
+   VLIW64 Mode:
+   16 bit core insn (core) and 48 bit coprocessor insn (cop1)
+   32 bit core insn (core) and 32 bit coprocessor insn (cop1)
+   64 bit coprocessor insn (cop1)
+  
+   The framework for an internally parallel coprocessor is also
+   present (2nd coprocessor insn is cop2), but at this time it 
+   is not used.  This only appears to be valid in VLIW64 mode.  */
+
+static int
+mep_examine_vliw32_insns (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
+{
+  int status;
+  int buflength;
+  int corebuflength;
+  int cop1buflength;
+  int cop2buflength;
+  bfd_byte buf[CGEN_MAX_INSN_SIZE];  
+  char indicator16[1];
+  char indicatorcop32[2]; 
+
+  /* At this time we're not supporting internally parallel coprocessors,
+     so cop2buflength will always be 0.  */
+  cop2buflength = 0;
+
+  /* Read in 32 bits.  */
+  buflength = 4; /* VLIW insn spans 4 bytes.  */
+  status = (*info->read_memory_func) (pc, buf, buflength, info);
+
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, pc, info);
+      return -1;
+    }
+
+  /* Put the big endian representation of the bytes to be examined
+     in the temporary buffers for examination.  */
+
+  if (info->endian == BFD_ENDIAN_BIG)
+    {
+      indicator16[0] = buf[0];
+      indicatorcop32[0] = buf[0];
+      indicatorcop32[1] = buf[1];
+    }
+  else
+    {
+      indicator16[0] = buf[1];
+      indicatorcop32[0] = buf[1];
+      indicatorcop32[1] = buf[0];
+    }
+
+  /* If the two high order bits are 00, 01 or 10, we have a 16 bit
+     core insn and a 48 bit copro insn.  */
+
+  if ((indicator16[0] & 0x80) && (indicator16[0] & 0x40))
+    {
+      if ((indicatorcop32[0] & 0xf0) == 0xf0 && (indicatorcop32[1] & 0x07) == 0x07)
+	{
+          /* We have a 32 bit copro insn.  */
+          corebuflength = 0;
+	  /* All 4 4ytes are one copro insn. */
+          cop1buflength = 4;
+	}
+      else
+	{
+          /* We have a 32 bit core.  */
+          corebuflength = 4;
+          cop1buflength = 0;
+	}
+    }
+  else
+    {
+      /* We have a 16 bit core insn and a 16 bit copro insn.  */
+      corebuflength = 2;
+      cop1buflength = 2;
+    }
+
+  /* Now we have the distrubution set.  Print them out.  */
+  status = mep_print_vliw_insns (cd, pc, info, buf, corebuflength,
+				 cop1buflength, cop2buflength);
+
+  return status;
+}
+
+static int
+mep_examine_vliw64_insns (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
+{
+  int status;
+  int buflength;
+  int corebuflength;
+  int cop1buflength;
+  int cop2buflength;
+  bfd_byte buf[CGEN_MAX_INSN_SIZE];
+  char indicator16[1];
+  char indicator64[4];
+
+  /* At this time we're not supporting internally parallel
+     coprocessors, so cop2buflength will always be 0.  */
+  cop2buflength = 0;
+
+  /* Read in 64 bits.  */
+  buflength = 8; /* VLIW insn spans 8 bytes.  */
+  status = (*info->read_memory_func) (pc, buf, buflength, info);
+
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, pc, info);
+      return -1;
+    }
+
+  /* We have all 64 bits in the buffer now.  We have to figure out
+     what combination of instruction sizes are present.  The two
+     high order bits will indicate whether or not we have a 16 bit
+     core insn or not.  If not, then we have to look at the 7,8th
+     bytes to tell whether we have 64 bit copro insn or a 32 bit
+     core insn with a 32 bit copro insn.  Endianness will make a
+     difference here.  */
+
+  /* Put the big endian representation of the bytes to be examined
+     in the temporary buffers for examination.  */
+
+  /* indicator16[0] = buf[0];  */
+  if (info->endian == BFD_ENDIAN_BIG)
+    {
+      indicator16[0] = buf[0];
+      indicator64[0] = buf[0];
+      indicator64[1] = buf[1];
+      indicator64[2] = buf[2];
+      indicator64[3] = buf[3];
+    }
+  else
+    {
+      indicator16[0] = buf[1];
+      indicator64[0] = buf[1];
+      indicator64[1] = buf[0];
+      indicator64[2] = buf[3];
+      indicator64[3] = buf[2];
+    }
+
+  /* If the two high order bits are 00, 01 or 10, we have a 16 bit
+     core insn and a 48 bit copro insn.  */
+
+  if ((indicator16[0] & 0x80) && (indicator16[0] & 0x40))
+    {
+      if ((indicator64[0] & 0xf0) == 0xf0 && (indicator64[1] & 0x07) == 0x07
+	  && ((indicator64[2] & 0xfe) != 0xf0 || (indicator64[3] & 0xf4) != 0))
+	{
+          /* We have a 64 bit copro insn.  */
+          corebuflength = 0;
+	  /* All 8 bytes are one copro insn.  */
+          cop1buflength = 8;
+	}
+      else
+	{
+          /* We have a 32 bit core insn and a 32 bit copro insn.  */
+          corebuflength = 4;
+          cop1buflength = 4;
+	}
+    }
+  else
+    {
+      /* We have a 16 bit core insn and a 48 bit copro insn.  */
+      corebuflength = 2;
+      cop1buflength = 6;
+    }
+
+  /* Now we have the distrubution set.  Print them out. */
+  status = mep_print_vliw_insns (cd, pc, info, buf, corebuflength,
+				 cop1buflength, cop2buflength);
+
+  return status;
+}
+
+static int
+mep_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
+{
+  int status;
+
+  /* Extract and adapt to configuration number, if available. */
+  if (info->section && info->section->owner)
+    {
+      bfd *abfd = info->section->owner;
+      mep_config_index = abfd->tdata.elf_obj_data->elf_header->e_flags & EF_MEP_INDEX_MASK;
+      /* This instantly redefines MEP_CONFIG, MEP_OMASK, .... MEP_VLIW64 */
+    }
+
+  /* Picking the right ISA bitmask for the current context is tricky.  */
+  if (info->section)
+    {
+      if (info->section->flags & SEC_MEP_VLIW)
+	{
+	  /* Are we in 32 or 64 bit vliw mode?  */
+	  if (MEP_VLIW64)
+	    status = mep_examine_vliw64_insns (cd, pc, info);
+	  else
+	    status = mep_examine_vliw32_insns (cd, pc, info);
+	  /* Both the above branches set their own isa bitmasks.  */
+	}
+      else
+	{
+	  cd->isas = & MEP_CORE_ISA;
+	  status = default_print_insn (cd, pc, info);
+	}
+    }
+  else /* sid or gdb */
+    {
+      status = default_print_insn (cd, pc, info);
+    }
+
+  return status;
+}
+
+
+/* -- opc.c */
+
+void mep_cgen_print_operand
+  (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);
+
+/* Main entry point for printing operands.
+   XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
+   of dis-asm.h on cgen.h.
+
+   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 `print_insn_normal', but keeping it
+   separate makes clear the interface between `print_insn_normal' and each of
+   the handlers.  */
+
+void
+mep_cgen_print_operand (CGEN_CPU_DESC cd,
+			   int opindex,
+			   void * xinfo,
+			   CGEN_FIELDS *fields,
+			   void const *attrs ATTRIBUTE_UNUSED,
+			   bfd_vma pc,
+			   int length)
+{
+  disassemble_info *info = (disassemble_info *) xinfo;
+
+  switch (opindex)
+    {
+    case MEP_OPERAND_ADDR24A4 :
+      print_normal (cd, info, fields->f_24u8a4n, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_CALLNUM :
+      print_normal (cd, info, fields->f_callnum, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_CCCC :
+      print_normal (cd, info, fields->f_rm, 0, pc, length);
+      break;
+    case MEP_OPERAND_CCRN :
+      print_keyword (cd, info, & mep_cgen_opval_h_ccr, fields->f_ccrn, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_CDISP8 :
+      print_normal (cd, info, fields->f_8s24, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_CDISP8A2 :
+      print_normal (cd, info, fields->f_8s24a2, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_CDISP8A4 :
+      print_normal (cd, info, fields->f_8s24a4, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_CDISP8A8 :
+      print_normal (cd, info, fields->f_8s24a8, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_CIMM4 :
+      print_normal (cd, info, fields->f_rn, 0, pc, length);
+      break;
+    case MEP_OPERAND_CIMM5 :
+      print_normal (cd, info, fields->f_5u24, 0, pc, length);
+      break;
+    case MEP_OPERAND_CODE16 :
+      print_normal (cd, info, fields->f_16u16, 0, pc, length);
+      break;
+    case MEP_OPERAND_CODE24 :
+      print_normal (cd, info, fields->f_24u4n, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_CP_FLAG :
+      print_keyword (cd, info, & mep_cgen_opval_h_ccr, 0, 0);
+      break;
+    case MEP_OPERAND_CRN :
+      print_keyword (cd, info, & mep_cgen_opval_h_cr, fields->f_crn, 0);
+      break;
+    case MEP_OPERAND_CRN64 :
+      print_keyword (cd, info, & mep_cgen_opval_h_cr64, fields->f_crn, 0);
+      break;
+    case MEP_OPERAND_CRNX :
+      print_keyword (cd, info, & mep_cgen_opval_h_cr, fields->f_crnx, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_CRNX64 :
+      print_keyword (cd, info, & mep_cgen_opval_h_cr64, fields->f_crnx, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_CSRN :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, fields->f_csrn, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_CSRN_IDX :
+      print_normal (cd, info, fields->f_csrn, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_DBG :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_DEPC :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_EPC :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_EXC :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_FMAX_CCRN :
+      print_fmax_ccr (cd, info, & mep_cgen_opval_h_ccr, fields->f_fmax_4_4, 0);
+      break;
+    case MEP_OPERAND_FMAX_FRD :
+      print_fmax_cr (cd, info, & mep_cgen_opval_h_cr, fields->f_fmax_frd, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_FMAX_FRD_INT :
+      print_fmax_cr (cd, info, & mep_cgen_opval_h_cr, fields->f_fmax_frd, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_FMAX_FRM :
+      print_fmax_cr (cd, info, & mep_cgen_opval_h_cr, fields->f_fmax_frm, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_FMAX_FRN :
+      print_fmax_cr (cd, info, & mep_cgen_opval_h_cr, fields->f_fmax_frn, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_FMAX_FRN_INT :
+      print_fmax_cr (cd, info, & mep_cgen_opval_h_cr, fields->f_fmax_frn, 0|(1<<CGEN_OPERAND_VIRTUAL));
+      break;
+    case MEP_OPERAND_FMAX_RM :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_fmax_rm, 0);
+      break;
+    case MEP_OPERAND_HI :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_LO :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_LP :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_MB0 :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_MB1 :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_ME0 :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_ME1 :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_NPC :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_OPT :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_PCABS24A2 :
+      print_address (cd, info, fields->f_24u5a2n, 0|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_PCREL12A2 :
+      print_address (cd, info, fields->f_12s4a2, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
+      break;
+    case MEP_OPERAND_PCREL17A2 :
+      print_address (cd, info, fields->f_17s16a2, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
+      break;
+    case MEP_OPERAND_PCREL24A2 :
+      print_address (cd, info, fields->f_24s5a2n, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_PCREL8A2 :
+      print_address (cd, info, fields->f_8s8a2, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELAX)|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
+      break;
+    case MEP_OPERAND_PSW :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_R0 :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_R1 :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_RL :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rl, 0);
+      break;
+    case MEP_OPERAND_RM :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rm, 0);
+      break;
+    case MEP_OPERAND_RMA :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rm, 0);
+      break;
+    case MEP_OPERAND_RN :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RN3 :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3C :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3L :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3S :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3UC :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3UL :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RN3US :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn3, 0);
+      break;
+    case MEP_OPERAND_RNC :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RNL :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RNS :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RNUC :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RNUL :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_RNUS :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, fields->f_rn, 0);
+      break;
+    case MEP_OPERAND_SAR :
+      print_keyword (cd, info, & mep_cgen_opval_h_csr, 0, 0);
+      break;
+    case MEP_OPERAND_SDISP16 :
+      print_normal (cd, info, fields->f_16s16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_SIMM16 :
+      print_normal (cd, info, fields->f_16s16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_SIMM6 :
+      print_normal (cd, info, fields->f_6s8, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_SIMM8 :
+      print_normal (cd, info, fields->f_8s8, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_RELOC_IMPLIES_OVERFLOW), pc, length);
+      break;
+    case MEP_OPERAND_SP :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_SPR :
+      print_spreg (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_TP :
+      print_keyword (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_TPR :
+      print_tpreg (cd, info, & mep_cgen_opval_h_gpr, 0, 0);
+      break;
+    case MEP_OPERAND_UDISP2 :
+      print_normal (cd, info, fields->f_2u6, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+    case MEP_OPERAND_UDISP7 :
+      print_normal (cd, info, fields->f_7u9, 0, pc, length);
+      break;
+    case MEP_OPERAND_UDISP7A2 :
+      print_normal (cd, info, fields->f_7u9a2, 0, pc, length);
+      break;
+    case MEP_OPERAND_UDISP7A4 :
+      print_normal (cd, info, fields->f_7u9a4, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM16 :
+      print_normal (cd, info, fields->f_16u16, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM2 :
+      print_normal (cd, info, fields->f_2u10, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM24 :
+      print_normal (cd, info, fields->f_24u8n, 0|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
+      break;
+    case MEP_OPERAND_UIMM3 :
+      print_normal (cd, info, fields->f_3u5, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM4 :
+      print_normal (cd, info, fields->f_4u8, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM5 :
+      print_normal (cd, info, fields->f_5u8, 0, pc, length);
+      break;
+    case MEP_OPERAND_UIMM7A4 :
+      print_normal (cd, info, fields->f_7u9a4, 0, pc, length);
+      break;
+    case MEP_OPERAND_ZERO :
+      print_normal (cd, info, 0, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
+	       opindex);
+    abort ();
+  }
+}
+
+cgen_print_fn * const mep_cgen_print_handlers[] = 
+{
+  print_insn_normal,
+};
+
+
+void
+mep_cgen_init_dis (CGEN_CPU_DESC cd)
+{
+  mep_cgen_init_opcode_table (cd);
+  mep_cgen_init_ibld_table (cd);
+  cd->print_handlers = & mep_cgen_print_handlers[0];
+  cd->print_operand = mep_cgen_print_operand;
+}
+
+
+/* Default print handler.  */
+
+static void
+print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+	      void *dis_info,
+	      long value,
+	      unsigned int attrs,
+	      bfd_vma pc ATTRIBUTE_UNUSED,
+	      int length ATTRIBUTE_UNUSED)
+{
+  disassemble_info *info = (disassemble_info *) dis_info;
+
+#ifdef CGEN_PRINT_NORMAL
+  CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
+#endif
+
+  /* Print the operand as directed by the attributes.  */
+  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
+    ; /* nothing to do */
+  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
+    (*info->fprintf_func) (info->stream, "%ld", value);
+  else
+    (*info->fprintf_func) (info->stream, "0x%lx", value);
+}
+
+/* Default address handler.  */
+
+static void
+print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+	       void *dis_info,
+	       bfd_vma value,
+	       unsigned int attrs,
+	       bfd_vma pc ATTRIBUTE_UNUSED,
+	       int length ATTRIBUTE_UNUSED)
+{
+  disassemble_info *info = (disassemble_info *) dis_info;
+
+#ifdef CGEN_PRINT_ADDRESS
+  CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
+#endif
+
+  /* Print the operand as directed by the attributes.  */
+  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
+    ; /* Nothing to do.  */
+  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
+    (*info->print_address_func) (value, info);
+  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
+    (*info->print_address_func) (value, info);
+  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
+    (*info->fprintf_func) (info->stream, "%ld", (long) value);
+  else
+    (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
+}
+
+/* Keyword print handler.  */
+
+static void
+print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+	       void *dis_info,
+	       CGEN_KEYWORD *keyword_table,
+	       long value,
+	       unsigned int attrs ATTRIBUTE_UNUSED)
+{
+  disassemble_info *info = (disassemble_info *) dis_info;
+  const CGEN_KEYWORD_ENTRY *ke;
+
+  ke = cgen_keyword_lookup_value (keyword_table, value);
+  if (ke != NULL)
+    (*info->fprintf_func) (info->stream, "%s", ke->name);
+  else
+    (*info->fprintf_func) (info->stream, "???");
+}
+
+/* Default insn printer.
+
+   DIS_INFO is defined as `void *' so the disassembler needn't know anything
+   about disassemble_info.  */
+
+static void
+print_insn_normal (CGEN_CPU_DESC cd,
+		   void *dis_info,
+		   const CGEN_INSN *insn,
+		   CGEN_FIELDS *fields,
+		   bfd_vma pc,
+		   int length)
+{
+  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
+  disassemble_info *info = (disassemble_info *) dis_info;
+  const CGEN_SYNTAX_CHAR_TYPE *syn;
+
+  CGEN_INIT_PRINT (cd);
+
+  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
+    {
+      if (CGEN_SYNTAX_MNEMONIC_P (*syn))
+	{
+	  (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
+	  continue;
+	}
+      if (CGEN_SYNTAX_CHAR_P (*syn))
+	{
+	  (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
+	  continue;
+	}
+
+      /* We have an operand.  */
+      mep_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
+				 fields, CGEN_INSN_ATTRS (insn), pc, length);
+    }
+}
+
+/* Subroutine of print_insn. Reads an insn into the given buffers and updates
+   the extract info.
+   Returns 0 if all is well, non-zero otherwise.  */
+
+static int
+read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+	   bfd_vma pc,
+	   disassemble_info *info,
+	   bfd_byte *buf,
+	   int buflen,
+	   CGEN_EXTRACT_INFO *ex_info,
+	   unsigned long *insn_value)
+{
+  int status = (*info->read_memory_func) (pc, buf, buflen, info);
+
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, pc, info);
+      return -1;
+    }
+
+  ex_info->dis_info = info;
+  ex_info->valid = (1 << buflen) - 1;
+  ex_info->insn_bytes = buf;
+
+  *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
+  return 0;
+}
+
+/* Utility to print an insn.
+   BUF is the base part of the insn, target byte order, BUFLEN bytes long.
+   The result is the size of the insn in bytes or zero for an unknown insn
+   or -1 if an error occurs fetching data (memory_error_func will have
+   been called).  */
+
+static int
+print_insn (CGEN_CPU_DESC cd,
+	    bfd_vma pc,
+	    disassemble_info *info,
+	    bfd_byte *buf,
+	    unsigned int buflen)
+{
+  CGEN_INSN_INT insn_value;
+  const CGEN_INSN_LIST *insn_list;
+  CGEN_EXTRACT_INFO ex_info;
+  int basesize;
+
+  /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
+  basesize = cd->base_insn_bitsize < buflen * 8 ?
+                                     cd->base_insn_bitsize : buflen * 8;
+  insn_value = cgen_get_insn_value (cd, buf, basesize);
+
+
+  /* Fill in ex_info fields like read_insn would.  Don't actually call
+     read_insn, since the incoming buffer is already read (and possibly
+     modified a la m32r).  */
+  ex_info.valid = (1 << buflen) - 1;
+  ex_info.dis_info = info;
+  ex_info.insn_bytes = buf;
+
+  /* The instructions are stored in hash lists.
+     Pick the first one and keep trying until we find the right one.  */
+
+  insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
+  while (insn_list != NULL)
+    {
+      const CGEN_INSN *insn = insn_list->insn;
+      CGEN_FIELDS fields;
+      int length;
+      unsigned long insn_value_cropped;
+
+#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
+      /* Not needed as insn shouldn't be in hash lists if not supported.  */
+      /* Supported by this cpu?  */
+      if (! mep_cgen_insn_supported (cd, insn))
+        {
+          insn_list = CGEN_DIS_NEXT_INSN (insn_list);
+	  continue;
+        }
+#endif
+
+      /* Basic bit mask must be correct.  */
+      /* ??? May wish to allow target to defer this check until the extract
+	 handler.  */
+
+      /* Base size may exceed this instruction's size.  Extract the
+         relevant part from the buffer. */
+      if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
+	  (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
+	insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn), 
+					   info->endian == BFD_ENDIAN_BIG);
+      else
+	insn_value_cropped = insn_value;
+
+      if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
+	  == CGEN_INSN_BASE_VALUE (insn))
+	{
+	  /* Printing is handled in two passes.  The first pass parses the
+	     machine insn and extracts the fields.  The second pass prints
+	     them.  */
+
+	  /* Make sure the entire insn is loaded into insn_value, if it
+	     can fit.  */
+	  if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
+	      (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
+	    {
+	      unsigned long full_insn_value;
+	      int rc = read_insn (cd, pc, info, buf,
+				  CGEN_INSN_BITSIZE (insn) / 8,
+				  & ex_info, & full_insn_value);
+	      if (rc != 0)
+		return rc;
+	      length = CGEN_EXTRACT_FN (cd, insn)
+		(cd, insn, &ex_info, full_insn_value, &fields, pc);
+	    }
+	  else
+	    length = CGEN_EXTRACT_FN (cd, insn)
+	      (cd, insn, &ex_info, insn_value_cropped, &fields, pc);
+
+	  /* Length < 0 -> error.  */
+	  if (length < 0)
+	    return length;
+	  if (length > 0)
+	    {
+	      CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
+	      /* Length is in bits, result is in bytes.  */
+	      return length / 8;
+	    }
+	}
+
+      insn_list = CGEN_DIS_NEXT_INSN (insn_list);
+    }
+
+  return 0;
+}
+
+/* Default value for CGEN_PRINT_INSN.
+   The result is the size of the insn in bytes or zero for an unknown insn
+   or -1 if an error occured fetching bytes.  */
+
+#ifndef CGEN_PRINT_INSN
+#define CGEN_PRINT_INSN default_print_insn
+#endif
+
+static int
+default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
+{
+  bfd_byte buf[CGEN_MAX_INSN_SIZE];
+  int buflen;
+  int status;
+
+  /* Attempt to read the base part of the insn.  */
+  buflen = cd->base_insn_bitsize / 8;
+  status = (*info->read_memory_func) (pc, buf, buflen, info);
+
+  /* Try again with the minimum part, if min < base.  */
+  if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
+    {
+      buflen = cd->min_insn_bitsize / 8;
+      status = (*info->read_memory_func) (pc, buf, buflen, info);
+    }
+
+  if (status != 0)
+    {
+      (*info->memory_error_func) (status, pc, info);
+      return -1;
+    }
+
+  return print_insn (cd, pc, info, buf, buflen);
+}
+
+/* Main entry point.
+   Print one instruction from PC on INFO->STREAM.
+   Return the size of the instruction (in bytes).  */
+
+typedef struct cpu_desc_list
+{
+  struct cpu_desc_list *next;
+  CGEN_BITSET *isa;
+  int mach;
+  int endian;
+  CGEN_CPU_DESC cd;
+} cpu_desc_list;
+
+int
+print_insn_mep (bfd_vma pc, disassemble_info *info)
+{
+  static cpu_desc_list *cd_list = 0;
+  cpu_desc_list *cl = 0;
+  static CGEN_CPU_DESC cd = 0;
+  static CGEN_BITSET *prev_isa;
+  static int prev_mach;
+  static int prev_endian;
+  int length;
+  CGEN_BITSET *isa;
+  int mach;
+  int endian = (info->endian == BFD_ENDIAN_BIG
+		? CGEN_ENDIAN_BIG
+		: CGEN_ENDIAN_LITTLE);
+  enum bfd_architecture arch;
+
+  /* ??? gdb will set mach but leave the architecture as "unknown" */
+#ifndef CGEN_BFD_ARCH
+#define CGEN_BFD_ARCH bfd_arch_mep
+#endif
+  arch = info->arch;
+  if (arch == bfd_arch_unknown)
+    arch = CGEN_BFD_ARCH;
+   
+  /* There's no standard way to compute the machine or isa number
+     so we leave it to the target.  */
+#ifdef CGEN_COMPUTE_MACH
+  mach = CGEN_COMPUTE_MACH (info);
+#else
+  mach = info->mach;
+#endif
+
+#ifdef CGEN_COMPUTE_ISA
+  {
+    static CGEN_BITSET *permanent_isa;
+
+    if (!permanent_isa)
+      permanent_isa = cgen_bitset_create (MAX_ISAS);
+    isa = permanent_isa;
+    cgen_bitset_clear (isa);
+    cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
+  }
+#else
+  isa = info->insn_sets;
+#endif
+
+  /* If we've switched cpu's, try to find a handle we've used before */
+  if (cd
+      && (cgen_bitset_compare (isa, prev_isa) != 0
+	  || mach != prev_mach
+	  || endian != prev_endian))
+    {
+      cd = 0;
+      for (cl = cd_list; cl; cl = cl->next)
+	{
+	  if (cgen_bitset_compare (cl->isa, isa) == 0 &&
+	      cl->mach == mach &&
+	      cl->endian == endian)
+	    {
+	      cd = cl->cd;
+ 	      prev_isa = cd->isas;
+	      break;
+	    }
+	}
+    } 
+
+  /* If we haven't initialized yet, initialize the opcode table.  */
+  if (! cd)
+    {
+      const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
+      const char *mach_name;
+
+      if (!arch_type)
+	abort ();
+      mach_name = arch_type->printable_name;
+
+      prev_isa = cgen_bitset_copy (isa);
+      prev_mach = mach;
+      prev_endian = endian;
+      cd = mep_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
+				 CGEN_CPU_OPEN_BFDMACH, mach_name,
+				 CGEN_CPU_OPEN_ENDIAN, prev_endian,
+				 CGEN_CPU_OPEN_END);
+      if (!cd)
+	abort ();
+
+      /* Save this away for future reference.  */
+      cl = xmalloc (sizeof (struct cpu_desc_list));
+      cl->cd = cd;
+      cl->isa = prev_isa;
+      cl->mach = mach;
+      cl->endian = endian;
+      cl->next = cd_list;
+      cd_list = cl;
+
+      mep_cgen_init_dis (cd);
+    }
+
+  /* We try to have as much common code as possible.
+     But at this point some targets need to take over.  */
+  /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
+     but if not possible try to move this hook elsewhere rather than
+     have two hooks.  */
+  length = CGEN_PRINT_INSN (cd, pc, info);
+  if (length > 0)
+    return length;
+  if (length < 0)
+    return -1;
+
+  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
+  return cd->default_insn_bitsize / 8;
+}