Subversion Repositories openrisc_2011-10-31

/* Disassemble V850 instructions.

   Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2007

   Free Software Foundation, Inc.

   This file is part of the GNU opcodes library.

   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.  */

#include <stdio.h>

#include "sysdep.h"

#include "opcode/v850.h"

#include "dis-asm.h"

#include "opintl.h"

static const char *const v850_reg_names[] =

{ "r0", "r1", "r2", "sp", "gp", "r5", "r6", "r7",

  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",

  "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",

  "r24", "r25", "r26", "r27", "r28", "r29", "ep", "lp" };

static const char *const v850_sreg_names[] =

{ "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7",

  "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15",

  "ctpc", "ctpsw", "dbpc", "dbpsw", "ctbp", "sr21", "sr22", "sr23",

  "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31",

  "sr16", "sr17", "sr18", "sr19", "sr20", "sr21", "sr22", "sr23",

  "sr24", "sr25", "sr26", "sr27", "sr28", "sr29", "sr30", "sr31" };

static const char *const v850_cc_names[] =

{ "v", "c/l", "z", "nh", "s/n", "t", "lt", "le",

  "nv", "nc/nl", "nz", "h", "ns/p", "sa", "ge", "gt" };

static int

disassemble (bfd_vma memaddr,

             struct disassemble_info * info,

             unsigned long insn)

{

  struct v850_opcode * op = (struct v850_opcode *) v850_opcodes;

  const struct v850_operand * operand;

  int match = 0;

  int short_op = ((insn & 0x0600) != 0x0600);

  int bytes_read;

  int target_processor;

  /* Special case: 32 bit MOV.  */

  if ((insn & 0xffe0) == 0x0620)

    short_op = 1;

  bytes_read = short_op ? 2 : 4;

  /* If this is a two byte insn, then mask off the high bits.  */

  if (short_op)

    insn &= 0xffff;

  switch (info->mach)

    {

    case 0:

    default:

      target_processor = PROCESSOR_V850;

      break;

    case bfd_mach_v850e:

      target_processor = PROCESSOR_V850E;

      break;

    case bfd_mach_v850e1:

      target_processor = PROCESSOR_V850E1;

      break;

    }

  /* Find the opcode.  */

  while (op->name)

    {

      if ((op->mask & insn) == op->opcode

          && (op->processors & target_processor))

        {

          const unsigned char *opindex_ptr;

          unsigned int opnum;

          unsigned int memop;

          match = 1;

          (*info->fprintf_func) (info->stream, "%s\t", op->name);

          memop = op->memop;

          /* Now print the operands.

             MEMOP is the operand number at which a memory

             address specification starts, or zero if this

             instruction has no memory addresses.

             A memory address is always two arguments.

             This information allows us to determine when to

             insert commas into the output stream as well as

             when to insert disp[reg] expressions onto the

             output stream.  */

          for (opindex_ptr = op->operands, opnum = 1;

               *opindex_ptr != 0;

               opindex_ptr++, opnum++)

            {

              long value;

              int flag;

              int status;

              bfd_byte buffer[4];

              operand = &v850_operands[*opindex_ptr];

              if (operand->extract)

                value = (operand->extract) (insn, 0);

              else

                {

                  if (operand->bits == -1)

                    value = (insn & operand->shift);

                  else

                    value = (insn >> operand->shift) & ((1 << operand->bits) - 1);

                  if (operand->flags & V850_OPERAND_SIGNED)

                    value = ((long)(value << (32 - operand->bits))

                             >> (32 - operand->bits));

                }

              /* The first operand is always output without any

                 special handling.

                 For the following arguments:

                   If memop && opnum == memop + 1, then we need '[' since

                   we're about to output the register used in a memory

                   reference.

                   If memop && opnum == memop + 2, then we need ']' since

                   we just finished the register in a memory reference.  We

                   also need a ',' before this operand.

                   Else we just need a comma.

                   We may need to output a trailing ']' if the last operand

                   in an instruction is the register for a memory address.

                   The exception (and there's always an exception) is the

                   "jmp" insn which needs square brackets around it's only

                   register argument.  */

                   if (memop && opnum == memop + 1)

                     info->fprintf_func (info->stream, "[");

                   else if (memop && opnum == memop + 2)

                     info->fprintf_func (info->stream, "],");

                   else if (memop == 1 && opnum == 1

                            && (operand->flags & V850_OPERAND_REG))

                     info->fprintf_func (info->stream, "[");

                   else if (opnum > 1)

                     info->fprintf_func (info->stream, ", ");

              /* Extract the flags, ignorng ones which

                 do not effect disassembly output. */

              flag = operand->flags;

              flag &= ~ V850_OPERAND_SIGNED;

              flag &= ~ V850_OPERAND_RELAX;

              flag &= - flag;

              switch (flag)

                {

                case V850_OPERAND_REG:

                  info->fprintf_func (info->stream, "%s", v850_reg_names[value]);

                  break;

                case V850_OPERAND_SRG:

                  info->fprintf_func (info->stream, "%s", v850_sreg_names[value]);

                  break;

                case V850_OPERAND_CC:

                  info->fprintf_func (info->stream, "%s", v850_cc_names[value]);

                  break;

                case V850_OPERAND_EP:

                  info->fprintf_func (info->stream, "ep");

                  break;

                default:

                  info->fprintf_func (info->stream, "%ld", value);

                  break;

                case V850_OPERAND_DISP:

                  {

                    bfd_vma addr = value + memaddr;

                    /* On the v850 the top 8 bits of an address are used by an

                       overlay manager.  Thus it may happen that when we are

                       looking for a symbol to match against an address with

                       some of its top bits set, the search fails to turn up an

                       exact match.  In this case we try to find an exact match

                       against a symbol in the lower address space, and if we

                       find one, we use that address.   We only do this for

                       JARL instructions however, as we do not want to

                       misinterpret branch instructions.  */

                    if (operand->bits == 22)

                      {

                        if ( ! info->symbol_at_address_func (addr, info)

                            && ((addr & 0xFF000000) != 0)

                            && info->symbol_at_address_func (addr & 0x00FFFFFF, info))

                          addr &= 0x00FFFFFF;

                      }

                    info->print_address_func (addr, info);

                    break;

                  }

                case V850E_PUSH_POP:

                  {

                    static int list12_regs[32]   = { 30,  0,  0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0,  0, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };

                    static int list18_h_regs[32] = { 19, 18, 17, 16, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 30, 31, 29, 28, 23, 22, 21, 20, 27, 26, 25, 24 };

                    static int list18_l_regs[32] = {  3,  2,  1, -2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 14, 15, 13, 12,  7,  6,  5,  4, 11, 10,  9,  8 };

                    int *regs;

                    int i;

                    unsigned long int mask = 0;

                    int pc = 0;

                    int sr = 0;

                    switch (operand->shift)

                      {

                      case 0xffe00001: regs = list12_regs; break;

                      case 0xfff8000f: regs = list18_h_regs; break;

                      case 0xfff8001f:

                        regs = list18_l_regs;

                        value &= ~0x10;  /* Do not include magic bit.  */

                          break;

                      default:

                        /* xgettext:c-format */

                        fprintf (stderr, _("unknown operand shift: %x\n"),

                                 operand->shift);

                        abort ();

                      }

                    for (i = 0; i < 32; i++)

                      {

                        if (value & (1 << i))

                          {

                            switch (regs[ i ])

                              {

                              default: mask |= (1 << regs[ i ]); break;

                                /* xgettext:c-format */

                              case 0:

                                fprintf (stderr, _("unknown pop reg: %d\n"), i );

                                abort ();

                              case -1: pc = 1; break;

                              case -2: sr = 1; break;

                              }

                          }

                      }

                    info->fprintf_func (info->stream, "{");

                    if (mask || pc || sr)

                      {

                        if (mask)

                          {

                            unsigned int bit;

                            int shown_one = 0;

                            for (bit = 0; bit < 32; bit++)

                              if (mask & (1 << bit))

                                {

                                  unsigned long int first = bit;

                                  unsigned long int last;

                                  if (shown_one)

                                    info->fprintf_func (info->stream, ", ");

                                  else

                                    shown_one = 1;

                                  info->fprintf_func (info->stream,

                                                      v850_reg_names[first]);

                                  for (bit++; bit < 32; bit++)

                                    if ((mask & (1 << bit)) == 0)

                                      break;

                                  last = bit;

                                  if (last > first + 1)

                                    info->fprintf_func (info->stream, " - %s",

                                                        v850_reg_names[last - 1]);

                                }

                          }

                        if (pc)

                          info->fprintf_func (info->stream, "%sPC", mask ? ", " : "");

                        if (sr)

                          info->fprintf_func (info->stream, "%sSR", (mask || pc) ? ", " : "");

                      }

                    info->fprintf_func (info->stream, "}");

                  }

                break;

                case V850E_IMMEDIATE16:

                  status = info->read_memory_func (memaddr + bytes_read,

                                                   buffer, 2, info);

                  if (status == 0)

                    {

                      bytes_read += 2;

                      value = bfd_getl16 (buffer);

                      /* If this is a DISPOSE instruction with ff

                         set to 0x10, then shift value up by 16.  */

                      if ((insn & 0x001fffc0) == 0x00130780)

                        value <<= 16;

                      info->fprintf_func (info->stream, "0x%lx", value);

                    }

                  else

                    info->memory_error_func (status, memaddr + bytes_read,

                                             info);

                  break;

                case V850E_IMMEDIATE32:

                  status = info->read_memory_func (memaddr + bytes_read,

                                                   buffer, 4, info);

                  if (status == 0)

                    {

                      bytes_read += 4;

                      value = bfd_getl32 (buffer);

                      info->fprintf_func (info->stream, "0x%lx", value);

                    }

                  else

                    info->memory_error_func (status, memaddr + bytes_read,

                                             info);

                  break;

                }

              /* Handle jmp correctly.  */

              if (memop == 1 && opnum == 1

                  && ((operand->flags & V850_OPERAND_REG) != 0))

                (*info->fprintf_func) (info->stream, "]");

            }

          /* Close any square bracket we left open.  */

          if (memop && opnum == memop + 2)

            (*info->fprintf_func) (info->stream, "]");

          /* All done. */

          break;

        }

      op++;

    }

  if (!match)

    {

      if (short_op)

        info->fprintf_func (info->stream, ".short\t0x%04lx", insn);

      else

        info->fprintf_func (info->stream, ".long\t0x%08lx", insn);

    }

  return bytes_read;

}

int

print_insn_v850 (bfd_vma memaddr, struct disassemble_info * info)

{

  int status;

  bfd_byte buffer[4];

  unsigned long insn = 0;

  /* First figure out how big the opcode is.  */

  status = info->read_memory_func (memaddr, buffer, 2, info);

  if (status == 0)

    {

      insn = bfd_getl16 (buffer);

      if (   (insn & 0x0600) == 0x0600

          && (insn & 0xffe0) != 0x0620)

        {

          /* If this is a 4 byte insn, read 4 bytes of stuff.  */

          status = info->read_memory_func (memaddr, buffer, 4, info);

          if (status == 0)

            insn = bfd_getl32 (buffer);

        }

    }

  if (status != 0)

    {

      info->memory_error_func (status, memaddr, info);

      return -1;

    }

  /* Make sure we tell our caller how many bytes we consumed.  */

  return disassemble (memaddr, info, insn);

}