Imported from /home/lorry/working-area/delta_binutils-tarball/binutils-2.25.tar.bz2.HEADbinutils-2.25master

1 files changed, 1061 insertions, 0 deletions

diff --git a/opcodes/lm32-ibld.c b/opcodes/lm32-ibld.c
new file mode 100644
index 0000000..d086967
--- /dev/null
+++ b/opcodes/lm32-ibld.c
@@ -0,0 +1,1061 @@
+/* Instruction building/extraction support for lm32. -*- C -*-
+
+   THIS FILE IS MACHINE GENERATED WITH CGEN: Cpu tools GENerator.
+   - the resultant file is machine generated, cgen-ibld.in isn't
+
+   Copyright (C) 1996-2014 Free Software Foundation, Inc.
+
+   This file is part of libopcodes.
+
+   This library is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   It is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation, Inc.,
+   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* ??? Eventually more and more of this stuff can go to cpu-independent files.
+   Keep that in mind.  */
+
+#include "sysdep.h"
+#include <stdio.h>
+#include "ansidecl.h"
+#include "dis-asm.h"
+#include "bfd.h"
+#include "symcat.h"
+#include "lm32-desc.h"
+#include "lm32-opc.h"
+#include "cgen/basic-modes.h"
+#include "opintl.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))
+
+/* Used by the ifield rtx function.  */
+#define FLD(f) (fields->f)
+
+static const char * insert_normal
+  (CGEN_CPU_DESC, long, unsigned int, unsigned int, unsigned int,
+   unsigned int, unsigned int, unsigned int, CGEN_INSN_BYTES_PTR);
+static const char * insert_insn_normal
+  (CGEN_CPU_DESC, const CGEN_INSN *,
+   CGEN_FIELDS *, CGEN_INSN_BYTES_PTR, bfd_vma);
+static int extract_normal
+  (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, CGEN_INSN_INT,
+   unsigned int, unsigned int, unsigned int, unsigned int,
+   unsigned int, unsigned int, bfd_vma, long *);
+static int extract_insn_normal
+  (CGEN_CPU_DESC, const CGEN_INSN *, CGEN_EXTRACT_INFO *,
+   CGEN_INSN_INT, CGEN_FIELDS *, bfd_vma);
+#if CGEN_INT_INSN_P
+static void put_insn_int_value
+  (CGEN_CPU_DESC, CGEN_INSN_BYTES_PTR, int, int, CGEN_INSN_INT);
+#endif
+#if ! CGEN_INT_INSN_P
+static CGEN_INLINE void insert_1
+  (CGEN_CPU_DESC, unsigned long, int, int, int, unsigned char *);
+static CGEN_INLINE int fill_cache
+  (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *,  int, int, bfd_vma);
+static CGEN_INLINE long extract_1
+  (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, int, int, int, unsigned char *, bfd_vma);
+#endif
+
+/* Operand insertion.  */
+
+#if ! CGEN_INT_INSN_P
+
+/* Subroutine of insert_normal.  */
+
+static CGEN_INLINE void
+insert_1 (CGEN_CPU_DESC cd,
+	  unsigned long value,
+	  int start,
+	  int length,
+	  int word_length,
+	  unsigned char *bufp)
+{
+  unsigned long x,mask;
+  int shift;
+
+  x = cgen_get_insn_value (cd, bufp, word_length);
+
+  /* Written this way to avoid undefined behaviour.  */
+  mask = (((1L << (length - 1)) - 1) << 1) | 1;
+  if (CGEN_INSN_LSB0_P)
+    shift = (start + 1) - length;
+  else
+    shift = (word_length - (start + length));
+  x = (x & ~(mask << shift)) | ((value & mask) << shift);
+
+  cgen_put_insn_value (cd, bufp, word_length, (bfd_vma) x);
+}
+
+#endif /* ! CGEN_INT_INSN_P */
+
+/* Default insertion routine.
+
+   ATTRS is a mask of the boolean attributes.
+   WORD_OFFSET is the offset in bits from the start of the insn of the value.
+   WORD_LENGTH is the length of the word in bits in which the value resides.
+   START is the starting bit number in the word, architecture origin.
+   LENGTH is the length of VALUE in bits.
+   TOTAL_LENGTH is the total length of the insn in bits.
+
+   The result is an error message or NULL if success.  */
+
+/* ??? This duplicates functionality with bfd's howto table and
+   bfd_install_relocation.  */
+/* ??? This doesn't handle bfd_vma's.  Create another function when
+   necessary.  */
+
+static const char *
+insert_normal (CGEN_CPU_DESC cd,
+	       long value,
+	       unsigned int attrs,
+	       unsigned int word_offset,
+	       unsigned int start,
+	       unsigned int length,
+	       unsigned int word_length,
+	       unsigned int total_length,
+	       CGEN_INSN_BYTES_PTR buffer)
+{
+  static char errbuf[100];
+  /* Written this way to avoid undefined behaviour.  */
+  unsigned long mask = (((1L << (length - 1)) - 1) << 1) | 1;
+
+  /* If LENGTH is zero, this operand doesn't contribute to the value.  */
+  if (length == 0)
+    return NULL;
+
+  if (word_length > 8 * sizeof (CGEN_INSN_INT))
+    abort ();
+
+  /* For architectures with insns smaller than the base-insn-bitsize,
+     word_length may be too big.  */
+  if (cd->min_insn_bitsize < cd->base_insn_bitsize)
+    {
+      if (word_offset == 0
+	  && word_length > total_length)
+	word_length = total_length;
+    }
+
+  /* Ensure VALUE will fit.  */
+  if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGN_OPT))
+    {
+      long minval = - (1L << (length - 1));
+      unsigned long maxval = mask;
+      
+      if ((value > 0 && (unsigned long) value > maxval)
+	  || value < minval)
+	{
+	  /* xgettext:c-format */
+	  sprintf (errbuf,
+		   _("operand out of range (%ld not between %ld and %lu)"),
+		   value, minval, maxval);
+	  return errbuf;
+	}
+    }
+  else if (! CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED))
+    {
+      unsigned long maxval = mask;
+      unsigned long val = (unsigned long) value;
+
+      /* For hosts with a word size > 32 check to see if value has been sign
+	 extended beyond 32 bits.  If so then ignore these higher sign bits
+	 as the user is attempting to store a 32-bit signed value into an
+	 unsigned 32-bit field which is allowed.  */
+      if (sizeof (unsigned long) > 4 && ((value >> 32) == -1))
+	val &= 0xFFFFFFFF;
+
+      if (val > maxval)
+	{
+	  /* xgettext:c-format */
+	  sprintf (errbuf,
+		   _("operand out of range (0x%lx not between 0 and 0x%lx)"),
+		   val, maxval);
+	  return errbuf;
+	}
+    }
+  else
+    {
+      if (! cgen_signed_overflow_ok_p (cd))
+	{
+	  long minval = - (1L << (length - 1));
+	  long maxval =   (1L << (length - 1)) - 1;
+	  
+	  if (value < minval || value > maxval)
+	    {
+	      sprintf
+		/* xgettext:c-format */
+		(errbuf, _("operand out of range (%ld not between %ld and %ld)"),
+		 value, minval, maxval);
+	      return errbuf;
+	    }
+	}
+    }
+
+#if CGEN_INT_INSN_P
+
+  {
+    int shift;
+
+    if (CGEN_INSN_LSB0_P)
+      shift = (word_offset + start + 1) - length;
+    else
+      shift = total_length - (word_offset + start + length);
+    *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
+  }
+
+#else /* ! CGEN_INT_INSN_P */
+
+  {
+    unsigned char *bufp = (unsigned char *) buffer + word_offset / 8;
+
+    insert_1 (cd, value, start, length, word_length, bufp);
+  }
+
+#endif /* ! CGEN_INT_INSN_P */
+
+  return NULL;
+}
+
+/* Default insn builder (insert handler).
+   The instruction is recorded in CGEN_INT_INSN_P byte order (meaning
+   that if CGEN_INSN_BYTES_PTR is an int * and thus, the value is
+   recorded in host byte order, otherwise BUFFER is an array of bytes
+   and the value is recorded in target byte order).
+   The result is an error message or NULL if success.  */
+
+static const char *
+insert_insn_normal (CGEN_CPU_DESC cd,
+		    const CGEN_INSN * insn,
+		    CGEN_FIELDS * fields,
+		    CGEN_INSN_BYTES_PTR buffer,
+		    bfd_vma pc)
+{
+  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
+  unsigned long value;
+  const CGEN_SYNTAX_CHAR_TYPE * syn;
+
+  CGEN_INIT_INSERT (cd);
+  value = CGEN_INSN_BASE_VALUE (insn);
+
+  /* If we're recording insns as numbers (rather than a string of bytes),
+     target byte order handling is deferred until later.  */
+
+#if CGEN_INT_INSN_P
+
+  put_insn_int_value (cd, buffer, cd->base_insn_bitsize,
+		      CGEN_FIELDS_BITSIZE (fields), value);
+
+#else
+
+  cgen_put_insn_value (cd, buffer, min ((unsigned) cd->base_insn_bitsize,
+					(unsigned) CGEN_FIELDS_BITSIZE (fields)),
+		       value);
+
+#endif /* ! CGEN_INT_INSN_P */
+
+  /* ??? It would be better to scan the format's fields.
+     Still need to be able to insert a value based on the operand though;
+     e.g. storing a branch displacement that got resolved later.
+     Needs more thought first.  */
+
+  for (syn = CGEN_SYNTAX_STRING (syntax); * syn; ++ syn)
+    {
+      const char *errmsg;
+
+      if (CGEN_SYNTAX_CHAR_P (* syn))
+	continue;
+
+      errmsg = (* cd->insert_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
+				       fields, buffer, pc);
+      if (errmsg)
+	return errmsg;
+    }
+
+  return NULL;
+}
+
+#if CGEN_INT_INSN_P
+/* Cover function to store an insn value into an integral insn.  Must go here
+   because it needs <prefix>-desc.h for CGEN_INT_INSN_P.  */
+
+static void
+put_insn_int_value (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+		    CGEN_INSN_BYTES_PTR buf,
+		    int length,
+		    int insn_length,
+		    CGEN_INSN_INT value)
+{
+  /* For architectures with insns smaller than the base-insn-bitsize,
+     length may be too big.  */
+  if (length > insn_length)
+    *buf = value;
+  else
+    {
+      int shift = insn_length - length;
+      /* Written this way to avoid undefined behaviour.  */
+      CGEN_INSN_INT mask = (((1L << (length - 1)) - 1) << 1) | 1;
+
+      *buf = (*buf & ~(mask << shift)) | ((value & mask) << shift);
+    }
+}
+#endif
+
+/* Operand extraction.  */
+
+#if ! CGEN_INT_INSN_P
+
+/* Subroutine of extract_normal.
+   Ensure sufficient bytes are cached in EX_INFO.
+   OFFSET is the offset in bytes from the start of the insn of the value.
+   BYTES is the length of the needed value.
+   Returns 1 for success, 0 for failure.  */
+
+static CGEN_INLINE int
+fill_cache (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+	    CGEN_EXTRACT_INFO *ex_info,
+	    int offset,
+	    int bytes,
+	    bfd_vma pc)
+{
+  /* It's doubtful that the middle part has already been fetched so
+     we don't optimize that case.  kiss.  */
+  unsigned int mask;
+  disassemble_info *info = (disassemble_info *) ex_info->dis_info;
+
+  /* First do a quick check.  */
+  mask = (1 << bytes) - 1;
+  if (((ex_info->valid >> offset) & mask) == mask)
+    return 1;
+
+  /* Search for the first byte we need to read.  */
+  for (mask = 1 << offset; bytes > 0; --bytes, ++offset, mask <<= 1)
+    if (! (mask & ex_info->valid))
+      break;
+
+  if (bytes)
+    {
+      int status;
+
+      pc += offset;
+      status = (*info->read_memory_func)
+	(pc, ex_info->insn_bytes + offset, bytes, info);
+
+      if (status != 0)
+	{
+	  (*info->memory_error_func) (status, pc, info);
+	  return 0;
+	}
+
+      ex_info->valid |= ((1 << bytes) - 1) << offset;
+    }
+
+  return 1;
+}
+
+/* Subroutine of extract_normal.  */
+
+static CGEN_INLINE long
+extract_1 (CGEN_CPU_DESC cd,
+	   CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED,
+	   int start,
+	   int length,
+	   int word_length,
+	   unsigned char *bufp,
+	   bfd_vma pc ATTRIBUTE_UNUSED)
+{
+  unsigned long x;
+  int shift;
+
+  x = cgen_get_insn_value (cd, bufp, word_length);
+
+  if (CGEN_INSN_LSB0_P)
+    shift = (start + 1) - length;
+  else
+    shift = (word_length - (start + length));
+  return x >> shift;
+}
+
+#endif /* ! CGEN_INT_INSN_P */
+
+/* Default extraction routine.
+
+   INSN_VALUE is the first base_insn_bitsize bits of the insn in host order,
+   or sometimes less for cases like the m32r where the base insn size is 32
+   but some insns are 16 bits.
+   ATTRS is a mask of the boolean attributes.  We only need `SIGNED',
+   but for generality we take a bitmask of all of them.
+   WORD_OFFSET is the offset in bits from the start of the insn of the value.
+   WORD_LENGTH is the length of the word in bits in which the value resides.
+   START is the starting bit number in the word, architecture origin.
+   LENGTH is the length of VALUE in bits.
+   TOTAL_LENGTH is the total length of the insn in bits.
+
+   Returns 1 for success, 0 for failure.  */
+
+/* ??? The return code isn't properly used.  wip.  */
+
+/* ??? This doesn't handle bfd_vma's.  Create another function when
+   necessary.  */
+
+static int
+extract_normal (CGEN_CPU_DESC cd,
+#if ! CGEN_INT_INSN_P
+		CGEN_EXTRACT_INFO *ex_info,
+#else
+		CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED,
+#endif
+		CGEN_INSN_INT insn_value,
+		unsigned int attrs,
+		unsigned int word_offset,
+		unsigned int start,
+		unsigned int length,
+		unsigned int word_length,
+		unsigned int total_length,
+#if ! CGEN_INT_INSN_P
+		bfd_vma pc,
+#else
+		bfd_vma pc ATTRIBUTE_UNUSED,
+#endif
+		long *valuep)
+{
+  long value, mask;
+
+  /* If LENGTH is zero, this operand doesn't contribute to the value
+     so give it a standard value of zero.  */
+  if (length == 0)
+    {
+      *valuep = 0;
+      return 1;
+    }
+
+  if (word_length > 8 * sizeof (CGEN_INSN_INT))
+    abort ();
+
+  /* For architectures with insns smaller than the insn-base-bitsize,
+     word_length may be too big.  */
+  if (cd->min_insn_bitsize < cd->base_insn_bitsize)
+    {
+      if (word_offset + word_length > total_length)
+	word_length = total_length - word_offset;
+    }
+
+  /* Does the value reside in INSN_VALUE, and at the right alignment?  */
+
+  if (CGEN_INT_INSN_P || (word_offset == 0 && word_length == total_length))
+    {
+      if (CGEN_INSN_LSB0_P)
+	value = insn_value >> ((word_offset + start + 1) - length);
+      else
+	value = insn_value >> (total_length - ( word_offset + start + length));
+    }
+
+#if ! CGEN_INT_INSN_P
+
+  else
+    {
+      unsigned char *bufp = ex_info->insn_bytes + word_offset / 8;
+
+      if (word_length > 8 * sizeof (CGEN_INSN_INT))
+	abort ();
+
+      if (fill_cache (cd, ex_info, word_offset / 8, word_length / 8, pc) == 0)
+	return 0;
+
+      value = extract_1 (cd, ex_info, start, length, word_length, bufp, pc);
+    }
+
+#endif /* ! CGEN_INT_INSN_P */
+
+  /* Written this way to avoid undefined behaviour.  */
+  mask = (((1L << (length - 1)) - 1) << 1) | 1;
+
+  value &= mask;
+  /* sign extend? */
+  if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED)
+      && (value & (1L << (length - 1))))
+    value |= ~mask;
+
+  *valuep = value;
+
+  return 1;
+}
+
+/* Default insn extractor.
+
+   INSN_VALUE is the first base_insn_bitsize bits, translated to host order.
+   The extracted fields are stored in FIELDS.
+   EX_INFO is used to handle reading variable length insns.
+   Return the length of the insn in bits, or 0 if no match,
+   or -1 if an error occurs fetching data (memory_error_func will have
+   been called).  */
+
+static int
+extract_insn_normal (CGEN_CPU_DESC cd,
+		     const CGEN_INSN *insn,
+		     CGEN_EXTRACT_INFO *ex_info,
+		     CGEN_INSN_INT insn_value,
+		     CGEN_FIELDS *fields,
+		     bfd_vma pc)
+{
+  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
+  const CGEN_SYNTAX_CHAR_TYPE *syn;
+
+  CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
+
+  CGEN_INIT_EXTRACT (cd);
+
+  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
+    {
+      int length;
+
+      if (CGEN_SYNTAX_CHAR_P (*syn))
+	continue;
+
+      length = (* cd->extract_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
+					ex_info, insn_value, fields, pc);
+      if (length <= 0)
+	return length;
+    }
+
+  /* We recognized and successfully extracted this insn.  */
+  return CGEN_INSN_BITSIZE (insn);
+}
+
+/* Machine generated code added here.  */
+
+const char * lm32_cgen_insert_operand
+  (CGEN_CPU_DESC, int, CGEN_FIELDS *, CGEN_INSN_BYTES_PTR, bfd_vma);
+
+/* Main entry point for operand insertion.
+
+   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.  It's also needed by GAS to insert operands that couldn't be
+   resolved during parsing.  */
+
+const char *
+lm32_cgen_insert_operand (CGEN_CPU_DESC cd,
+			     int opindex,
+			     CGEN_FIELDS * fields,
+			     CGEN_INSN_BYTES_PTR buffer,
+			     bfd_vma pc ATTRIBUTE_UNUSED)
+{
+  const char * errmsg = NULL;
+  unsigned int total_length = CGEN_FIELDS_BITSIZE (fields);
+
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      {
+        long value = fields->f_branch;
+        value = ((SI) (((value) - (pc))) >> (2));
+        errmsg = insert_normal (cd, value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 15, 16, 32, total_length, buffer);
+      }
+      break;
+    case LM32_OPERAND_CALL :
+      {
+        long value = fields->f_call;
+        value = ((SI) (((value) - (pc))) >> (2));
+        errmsg = insert_normal (cd, value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 25, 26, 32, total_length, buffer);
+      }
+      break;
+    case LM32_OPERAND_CSR :
+      errmsg = insert_normal (cd, fields->f_csr, 0, 0, 25, 5, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      errmsg = insert_normal (cd, fields->f_exception, 0, 0, 25, 26, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_GOT16 :
+      errmsg = insert_normal (cd, fields->f_imm, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      errmsg = insert_normal (cd, fields->f_imm, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      errmsg = insert_normal (cd, fields->f_imm, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_GP16 :
+      errmsg = insert_normal (cd, fields->f_imm, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_HI16 :
+      errmsg = insert_normal (cd, fields->f_uimm, 0, 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_IMM :
+      errmsg = insert_normal (cd, fields->f_imm, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_LO16 :
+      errmsg = insert_normal (cd, fields->f_uimm, 0, 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_R0 :
+      errmsg = insert_normal (cd, fields->f_r0, 0, 0, 25, 5, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_R1 :
+      errmsg = insert_normal (cd, fields->f_r1, 0, 0, 20, 5, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_R2 :
+      errmsg = insert_normal (cd, fields->f_r2, 0, 0, 15, 5, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_SHIFT :
+      errmsg = insert_normal (cd, fields->f_shift, 0, 0, 4, 5, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_UIMM :
+      errmsg = insert_normal (cd, fields->f_uimm, 0, 0, 15, 16, 32, total_length, buffer);
+      break;
+    case LM32_OPERAND_USER :
+      errmsg = insert_normal (cd, fields->f_user, 0, 0, 10, 11, 32, total_length, buffer);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while building insn.\n"),
+	       opindex);
+      abort ();
+  }
+
+  return errmsg;
+}
+
+int lm32_cgen_extract_operand
+  (CGEN_CPU_DESC, int, CGEN_EXTRACT_INFO *, CGEN_INSN_INT, CGEN_FIELDS *, bfd_vma);
+
+/* Main entry point for operand extraction.
+   The result is <= 0 for error, >0 for success.
+   ??? Actual values aren't well defined right now.
+
+   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.  */
+
+int
+lm32_cgen_extract_operand (CGEN_CPU_DESC cd,
+			     int opindex,
+			     CGEN_EXTRACT_INFO *ex_info,
+			     CGEN_INSN_INT insn_value,
+			     CGEN_FIELDS * fields,
+			     bfd_vma pc)
+{
+  /* Assume success (for those operands that are nops).  */
+  int length = 1;
+  unsigned int total_length = CGEN_FIELDS_BITSIZE (fields);
+
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      {
+        long value;
+        length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 15, 16, 32, total_length, pc, & value);
+        value = ((pc) + (((SI) (((value) << (16))) >> (14))));
+        fields->f_branch = value;
+      }
+      break;
+    case LM32_OPERAND_CALL :
+      {
+        long value;
+        length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 25, 26, 32, total_length, pc, & value);
+        value = ((pc) + (((SI) (((value) << (6))) >> (4))));
+        fields->f_call = value;
+      }
+      break;
+    case LM32_OPERAND_CSR :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 25, 5, 32, total_length, pc, & fields->f_csr);
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 25, 26, 32, total_length, pc, & fields->f_exception);
+      break;
+    case LM32_OPERAND_GOT16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_imm);
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_imm);
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_imm);
+      break;
+    case LM32_OPERAND_GP16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_imm);
+      break;
+    case LM32_OPERAND_HI16 :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 15, 16, 32, total_length, pc, & fields->f_uimm);
+      break;
+    case LM32_OPERAND_IMM :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_imm);
+      break;
+    case LM32_OPERAND_LO16 :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 15, 16, 32, total_length, pc, & fields->f_uimm);
+      break;
+    case LM32_OPERAND_R0 :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 25, 5, 32, total_length, pc, & fields->f_r0);
+      break;
+    case LM32_OPERAND_R1 :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 20, 5, 32, total_length, pc, & fields->f_r1);
+      break;
+    case LM32_OPERAND_R2 :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 15, 5, 32, total_length, pc, & fields->f_r2);
+      break;
+    case LM32_OPERAND_SHIFT :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 4, 5, 32, total_length, pc, & fields->f_shift);
+      break;
+    case LM32_OPERAND_UIMM :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 15, 16, 32, total_length, pc, & fields->f_uimm);
+      break;
+    case LM32_OPERAND_USER :
+      length = extract_normal (cd, ex_info, insn_value, 0, 0, 10, 11, 32, total_length, pc, & fields->f_user);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while decoding insn.\n"),
+	       opindex);
+      abort ();
+    }
+
+  return length;
+}
+
+cgen_insert_fn * const lm32_cgen_insert_handlers[] = 
+{
+  insert_insn_normal,
+};
+
+cgen_extract_fn * const lm32_cgen_extract_handlers[] = 
+{
+  extract_insn_normal,
+};
+
+int lm32_cgen_get_int_operand     (CGEN_CPU_DESC, int, const CGEN_FIELDS *);
+bfd_vma lm32_cgen_get_vma_operand (CGEN_CPU_DESC, int, const CGEN_FIELDS *);
+
+/* Getting values from cgen_fields is handled by a collection of functions.
+   They are distinguished by the type of the VALUE argument they return.
+   TODO: floating point, inlining support, remove cases where result type
+   not appropriate.  */
+
+int
+lm32_cgen_get_int_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     const CGEN_FIELDS * fields)
+{
+  int value;
+
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      value = fields->f_branch;
+      break;
+    case LM32_OPERAND_CALL :
+      value = fields->f_call;
+      break;
+    case LM32_OPERAND_CSR :
+      value = fields->f_csr;
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      value = fields->f_exception;
+      break;
+    case LM32_OPERAND_GOT16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GP16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_HI16 :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_IMM :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_LO16 :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_R0 :
+      value = fields->f_r0;
+      break;
+    case LM32_OPERAND_R1 :
+      value = fields->f_r1;
+      break;
+    case LM32_OPERAND_R2 :
+      value = fields->f_r2;
+      break;
+    case LM32_OPERAND_SHIFT :
+      value = fields->f_shift;
+      break;
+    case LM32_OPERAND_UIMM :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_USER :
+      value = fields->f_user;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while getting int operand.\n"),
+		       opindex);
+      abort ();
+  }
+
+  return value;
+}
+
+bfd_vma
+lm32_cgen_get_vma_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     const CGEN_FIELDS * fields)
+{
+  bfd_vma value;
+
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      value = fields->f_branch;
+      break;
+    case LM32_OPERAND_CALL :
+      value = fields->f_call;
+      break;
+    case LM32_OPERAND_CSR :
+      value = fields->f_csr;
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      value = fields->f_exception;
+      break;
+    case LM32_OPERAND_GOT16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_GP16 :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_HI16 :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_IMM :
+      value = fields->f_imm;
+      break;
+    case LM32_OPERAND_LO16 :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_R0 :
+      value = fields->f_r0;
+      break;
+    case LM32_OPERAND_R1 :
+      value = fields->f_r1;
+      break;
+    case LM32_OPERAND_R2 :
+      value = fields->f_r2;
+      break;
+    case LM32_OPERAND_SHIFT :
+      value = fields->f_shift;
+      break;
+    case LM32_OPERAND_UIMM :
+      value = fields->f_uimm;
+      break;
+    case LM32_OPERAND_USER :
+      value = fields->f_user;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while getting vma operand.\n"),
+		       opindex);
+      abort ();
+  }
+
+  return value;
+}
+
+void lm32_cgen_set_int_operand  (CGEN_CPU_DESC, int, CGEN_FIELDS *, int);
+void lm32_cgen_set_vma_operand  (CGEN_CPU_DESC, int, CGEN_FIELDS *, bfd_vma);
+
+/* Stuffing values in cgen_fields is handled by a collection of functions.
+   They are distinguished by the type of the VALUE argument they accept.
+   TODO: floating point, inlining support, remove cases where argument type
+   not appropriate.  */
+
+void
+lm32_cgen_set_int_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     CGEN_FIELDS * fields,
+			     int value)
+{
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      fields->f_branch = value;
+      break;
+    case LM32_OPERAND_CALL :
+      fields->f_call = value;
+      break;
+    case LM32_OPERAND_CSR :
+      fields->f_csr = value;
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      fields->f_exception = value;
+      break;
+    case LM32_OPERAND_GOT16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GP16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_HI16 :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_IMM :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_LO16 :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_R0 :
+      fields->f_r0 = value;
+      break;
+    case LM32_OPERAND_R1 :
+      fields->f_r1 = value;
+      break;
+    case LM32_OPERAND_R2 :
+      fields->f_r2 = value;
+      break;
+    case LM32_OPERAND_SHIFT :
+      fields->f_shift = value;
+      break;
+    case LM32_OPERAND_UIMM :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_USER :
+      fields->f_user = value;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while setting int operand.\n"),
+		       opindex);
+      abort ();
+  }
+}
+
+void
+lm32_cgen_set_vma_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     CGEN_FIELDS * fields,
+			     bfd_vma value)
+{
+  switch (opindex)
+    {
+    case LM32_OPERAND_BRANCH :
+      fields->f_branch = value;
+      break;
+    case LM32_OPERAND_CALL :
+      fields->f_call = value;
+      break;
+    case LM32_OPERAND_CSR :
+      fields->f_csr = value;
+      break;
+    case LM32_OPERAND_EXCEPTION :
+      fields->f_exception = value;
+      break;
+    case LM32_OPERAND_GOT16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GOTOFFHI16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GOTOFFLO16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_GP16 :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_HI16 :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_IMM :
+      fields->f_imm = value;
+      break;
+    case LM32_OPERAND_LO16 :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_R0 :
+      fields->f_r0 = value;
+      break;
+    case LM32_OPERAND_R1 :
+      fields->f_r1 = value;
+      break;
+    case LM32_OPERAND_R2 :
+      fields->f_r2 = value;
+      break;
+    case LM32_OPERAND_SHIFT :
+      fields->f_shift = value;
+      break;
+    case LM32_OPERAND_UIMM :
+      fields->f_uimm = value;
+      break;
+    case LM32_OPERAND_USER :
+      fields->f_user = value;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      fprintf (stderr, _("Unrecognized field %d while setting vma operand.\n"),
+		       opindex);
+      abort ();
+  }
+}
+
+/* Function to call before using the instruction builder tables.  */
+
+void
+lm32_cgen_init_ibld_table (CGEN_CPU_DESC cd)
+{
+  cd->insert_handlers = & lm32_cgen_insert_handlers[0];
+  cd->extract_handlers = & lm32_cgen_extract_handlers[0];
+
+  cd->insert_operand = lm32_cgen_insert_operand;
+  cd->extract_operand = lm32_cgen_extract_operand;
+
+  cd->get_int_operand = lm32_cgen_get_int_operand;
+  cd->set_int_operand = lm32_cgen_set_int_operand;
+  cd->get_vma_operand = lm32_cgen_get_vma_operand;
+  cd->set_vma_operand = lm32_cgen_set_vma_operand;
+}