opcodes: add support for eBPF

This patch adds support for the Linux kernel eBPF architecture to the
opcodes.  The port is based on CGEN.

opcodes/ChangeLog:

2019-05-23  Jose E. Marchesi  <jose.marchesi@oracle.com>

	* configure.ac (SHARED_DEPENDENCIES): Add case for bfd_bpf_arch.
	* configure: Regenerated.
	* Makefile.am: Add rules for the files generated from cpu/bpf.cpu
	and cpu/bpf.opc.
	(HFILES): Add bpf-desc.h and bpf-opc.h.
	(TARGET_LIBOPCODES_CFILES): Add bpf-asm.c, bpf-desc.c, bpf-dis.c,
	bpf-ibld.c and bpf-opc.c.
	(BPF_DEPS): Define.
	* Makefile.in: Regenerated.
	* disassemble.c (ARCH_bpf): Define.
	(disassembler): Add case for bfd_arch_bpf.
	(disassemble_init_for_target): Likewise.
	(enum epbf_isa_attr): Define.
	* disassemble.h: extern print_insn_bpf.
	* bpf-asm.c: Generated.
	* bpf-opc.h: Likewise.
	* bpf-opc.c: Likewise.
	* bpf-ibld.c: Likewise.
	* bpf-dis.c: Likewise.
	* bpf-desc.h: Likewise.
	* bpf-desc.c: Likewise.

1 files changed, 956 insertions, 0 deletions

diff --git a/opcodes/bpf-ibld.c b/opcodes/bpf-ibld.c
new file mode 100644
index 0000000..b14c28b
--- /dev/null
+++ b/opcodes/bpf-ibld.c
@@ -0,0 +1,956 @@
+/* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
+/* Instruction building/extraction support for bpf. -*- C -*-
+
+   THIS FILE IS MACHINE GENERATED WITH CGEN: Cpu tools GENerator.
+   - the resultant file is machine generated, cgen-ibld.in isn't
+
+   Copyright (C) 1996-2019 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 "bpf-desc.h"
+#include "bpf-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_within_word, shift_to_word, shift;
+
+    /* How to shift the value to BIT0 of the word.  */
+    shift_to_word = total_length - (word_offset + word_length);
+
+    /* How to shift the value to the field within the word.  */
+    if (CGEN_INSN_LSB0_P)
+      shift_within_word = start + 1 - length;
+    else
+      shift_within_word = word_length - start - length;
+
+    /* The total SHIFT, then mask in the value.  */
+    shift = shift_to_word + shift_within_word;
+    *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 * bpf_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 *
+bpf_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 BPF_OPERAND_DISP16 :
+      errmsg = insert_normal (cd, fields->f_offset16, 0|(1<<CGEN_IFLD_SIGNED), 16, 15, 16, 16, total_length, buffer);
+      break;
+    case BPF_OPERAND_DISP32 :
+      errmsg = insert_normal (cd, fields->f_imm32, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, buffer);
+      break;
+    case BPF_OPERAND_DSTBE :
+      errmsg = insert_normal (cd, fields->f_dstbe, 0, 8, 7, 4, 8, total_length, buffer);
+      break;
+    case BPF_OPERAND_DSTLE :
+      errmsg = insert_normal (cd, fields->f_dstle, 0, 8, 3, 4, 8, total_length, buffer);
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      errmsg = insert_normal (cd, fields->f_imm32, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, buffer);
+      break;
+    case BPF_OPERAND_IMM32 :
+      errmsg = insert_normal (cd, fields->f_imm32, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, buffer);
+      break;
+    case BPF_OPERAND_IMM64 :
+      {
+{
+  FLD (f_imm64_b) = 0;
+  FLD (f_imm64_c) = ((UDI) (FLD (f_imm64)) >> (32));
+  FLD (f_imm64_a) = ((FLD (f_imm64)) & (MAKEDI (0, 0xffffffff)));
+}
+        errmsg = insert_normal (cd, fields->f_imm64_a, 0, 32, 31, 32, 32, total_length, buffer);
+        if (errmsg)
+          break;
+        errmsg = insert_normal (cd, fields->f_imm64_b, 0, 64, 31, 32, 32, total_length, buffer);
+        if (errmsg)
+          break;
+        errmsg = insert_normal (cd, fields->f_imm64_c, 0, 96, 31, 32, 32, total_length, buffer);
+        if (errmsg)
+          break;
+      }
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      errmsg = insert_normal (cd, fields->f_offset16, 0|(1<<CGEN_IFLD_SIGNED), 16, 15, 16, 16, total_length, buffer);
+      break;
+    case BPF_OPERAND_SRCBE :
+      errmsg = insert_normal (cd, fields->f_srcbe, 0, 8, 3, 4, 8, total_length, buffer);
+      break;
+    case BPF_OPERAND_SRCLE :
+      errmsg = insert_normal (cd, fields->f_srcle, 0, 8, 7, 4, 8, total_length, buffer);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while building insn"),
+	 opindex);
+      abort ();
+  }
+
+  return errmsg;
+}
+
+int bpf_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
+bpf_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 BPF_OPERAND_DISP16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 16, 15, 16, 16, total_length, pc, & fields->f_offset16);
+      break;
+    case BPF_OPERAND_DISP32 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, pc, & fields->f_imm32);
+      break;
+    case BPF_OPERAND_DSTBE :
+      length = extract_normal (cd, ex_info, insn_value, 0, 8, 7, 4, 8, total_length, pc, & fields->f_dstbe);
+      break;
+    case BPF_OPERAND_DSTLE :
+      length = extract_normal (cd, ex_info, insn_value, 0, 8, 3, 4, 8, total_length, pc, & fields->f_dstle);
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, pc, & fields->f_imm32);
+      break;
+    case BPF_OPERAND_IMM32 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 32, 31, 32, 32, total_length, pc, & fields->f_imm32);
+      break;
+    case BPF_OPERAND_IMM64 :
+      {
+        length = extract_normal (cd, ex_info, insn_value, 0, 32, 31, 32, 32, total_length, pc, & fields->f_imm64_a);
+        if (length <= 0) break;
+        length = extract_normal (cd, ex_info, insn_value, 0, 64, 31, 32, 32, total_length, pc, & fields->f_imm64_b);
+        if (length <= 0) break;
+        length = extract_normal (cd, ex_info, insn_value, 0, 96, 31, 32, 32, total_length, pc, & fields->f_imm64_c);
+        if (length <= 0) break;
+{
+  FLD (f_imm64) = ((((((DI) (UINT) (FLD (f_imm64_c)))) << (32))) | (((DI) (UINT) (FLD (f_imm64_a)))));
+}
+      }
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 16, 15, 16, 16, total_length, pc, & fields->f_offset16);
+      break;
+    case BPF_OPERAND_SRCBE :
+      length = extract_normal (cd, ex_info, insn_value, 0, 8, 3, 4, 8, total_length, pc, & fields->f_srcbe);
+      break;
+    case BPF_OPERAND_SRCLE :
+      length = extract_normal (cd, ex_info, insn_value, 0, 8, 7, 4, 8, total_length, pc, & fields->f_srcle);
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while decoding insn"),
+	 opindex);
+      abort ();
+    }
+
+  return length;
+}
+
+cgen_insert_fn * const bpf_cgen_insert_handlers[] =
+{
+  insert_insn_normal,
+};
+
+cgen_extract_fn * const bpf_cgen_extract_handlers[] =
+{
+  extract_insn_normal,
+};
+
+int bpf_cgen_get_int_operand     (CGEN_CPU_DESC, int, const CGEN_FIELDS *);
+bfd_vma bpf_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
+bpf_cgen_get_int_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     const CGEN_FIELDS * fields)
+{
+  int value;
+
+  switch (opindex)
+    {
+    case BPF_OPERAND_DISP16 :
+      value = fields->f_offset16;
+      break;
+    case BPF_OPERAND_DISP32 :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_DSTBE :
+      value = fields->f_dstbe;
+      break;
+    case BPF_OPERAND_DSTLE :
+      value = fields->f_dstle;
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_IMM32 :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_IMM64 :
+      value = fields->f_imm64;
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      value = fields->f_offset16;
+      break;
+    case BPF_OPERAND_SRCBE :
+      value = fields->f_srcbe;
+      break;
+    case BPF_OPERAND_SRCLE :
+      value = fields->f_srcle;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while getting int operand"),
+	 opindex);
+      abort ();
+  }
+
+  return value;
+}
+
+bfd_vma
+bpf_cgen_get_vma_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     const CGEN_FIELDS * fields)
+{
+  bfd_vma value;
+
+  switch (opindex)
+    {
+    case BPF_OPERAND_DISP16 :
+      value = fields->f_offset16;
+      break;
+    case BPF_OPERAND_DISP32 :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_DSTBE :
+      value = fields->f_dstbe;
+      break;
+    case BPF_OPERAND_DSTLE :
+      value = fields->f_dstle;
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_IMM32 :
+      value = fields->f_imm32;
+      break;
+    case BPF_OPERAND_IMM64 :
+      value = fields->f_imm64;
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      value = fields->f_offset16;
+      break;
+    case BPF_OPERAND_SRCBE :
+      value = fields->f_srcbe;
+      break;
+    case BPF_OPERAND_SRCLE :
+      value = fields->f_srcle;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while getting vma operand"),
+	 opindex);
+      abort ();
+  }
+
+  return value;
+}
+
+void bpf_cgen_set_int_operand  (CGEN_CPU_DESC, int, CGEN_FIELDS *, int);
+void bpf_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
+bpf_cgen_set_int_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     CGEN_FIELDS * fields,
+			     int value)
+{
+  switch (opindex)
+    {
+    case BPF_OPERAND_DISP16 :
+      fields->f_offset16 = value;
+      break;
+    case BPF_OPERAND_DISP32 :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_DSTBE :
+      fields->f_dstbe = value;
+      break;
+    case BPF_OPERAND_DSTLE :
+      fields->f_dstle = value;
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_IMM32 :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_IMM64 :
+      fields->f_imm64 = value;
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      fields->f_offset16 = value;
+      break;
+    case BPF_OPERAND_SRCBE :
+      fields->f_srcbe = value;
+      break;
+    case BPF_OPERAND_SRCLE :
+      fields->f_srcle = value;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while setting int operand"),
+	 opindex);
+      abort ();
+  }
+}
+
+void
+bpf_cgen_set_vma_operand (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
+			     int opindex,
+			     CGEN_FIELDS * fields,
+			     bfd_vma value)
+{
+  switch (opindex)
+    {
+    case BPF_OPERAND_DISP16 :
+      fields->f_offset16 = value;
+      break;
+    case BPF_OPERAND_DISP32 :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_DSTBE :
+      fields->f_dstbe = value;
+      break;
+    case BPF_OPERAND_DSTLE :
+      fields->f_dstle = value;
+      break;
+    case BPF_OPERAND_ENDSIZE :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_IMM32 :
+      fields->f_imm32 = value;
+      break;
+    case BPF_OPERAND_IMM64 :
+      fields->f_imm64 = value;
+      break;
+    case BPF_OPERAND_OFFSET16 :
+      fields->f_offset16 = value;
+      break;
+    case BPF_OPERAND_SRCBE :
+      fields->f_srcbe = value;
+      break;
+    case BPF_OPERAND_SRCLE :
+      fields->f_srcle = value;
+      break;
+
+    default :
+      /* xgettext:c-format */
+      opcodes_error_handler
+	(_("internal error: unrecognized field %d while setting vma operand"),
+	 opindex);
+      abort ();
+  }
+}
+
+/* Function to call before using the instruction builder tables.  */
+
+void
+bpf_cgen_init_ibld_table (CGEN_CPU_DESC cd)
+{
+  cd->insert_handlers = & bpf_cgen_insert_handlers[0];
+  cd->extract_handlers = & bpf_cgen_extract_handlers[0];
+
+  cd->insert_operand = bpf_cgen_insert_operand;
+  cd->extract_operand = bpf_cgen_extract_operand;
+
+  cd->get_int_operand = bpf_cgen_get_int_operand;
+  cd->set_int_operand = bpf_cgen_set_int_operand;
+  cd->get_vma_operand = bpf_cgen_get_vma_operand;
+  cd->set_vma_operand = bpf_cgen_set_vma_operand;
+}