Subversion Repositories openrisc_2011-10-31

/* Disassemble AVR instructions.

   Copyright 1999, 2000, 2002, 2004, 2005, 2006, 2007, 2008

   Free Software Foundation, Inc.

   Contributed by Denis Chertykov <denisc@overta.ru>

   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.  */

#include <assert.h>

#include "sysdep.h"

#include "dis-asm.h"

#include "opintl.h"

#include "libiberty.h"

struct avr_opcodes_s

{

  char *name;

  char *constraints;

  char *opcode;

  int insn_size;                /* In words.  */

  int isa;

  unsigned int bin_opcode;

};

#define AVR_INSN(NAME, CONSTR, OPCODE, SIZE, ISA, BIN) \

{#NAME, CONSTR, OPCODE, SIZE, ISA, BIN},

const struct avr_opcodes_s avr_opcodes[] =

{

  #include "opcode/avr.h"

  {NULL, NULL, NULL, 0, 0, 0}

};

static const char * comment_start = "0x";

static int

avr_operand (unsigned int insn, unsigned int insn2, unsigned int pc, int constraint,

             char *buf, char *comment, int regs, int *sym, bfd_vma *sym_addr)

{

  int ok = 1;

  *sym = 0;

  switch (constraint)

    {

      /* Any register operand.  */

    case 'r':

      if (regs)

        insn = (insn & 0xf) | ((insn & 0x0200) >> 5); /* Source register.  */

      else

        insn = (insn & 0x01f0) >> 4; /* Destination register.  */

      sprintf (buf, "r%d", insn);

      break;

    case 'd':

      if (regs)

        sprintf (buf, "r%d", 16 + (insn & 0xf));

      else

        sprintf (buf, "r%d", 16 + ((insn & 0xf0) >> 4));

      break;

    case 'w':

      sprintf (buf, "r%d", 24 + ((insn & 0x30) >> 3));

      break;

    case 'a':

      if (regs)

        sprintf (buf, "r%d", 16 + (insn & 7));

      else

        sprintf (buf, "r%d", 16 + ((insn >> 4) & 7));

      break;

    case 'v':

      if (regs)

        sprintf (buf, "r%d", (insn & 0xf) * 2);

      else

        sprintf (buf, "r%d", ((insn & 0xf0) >> 3));

      break;

    case 'e':

      {

        char *xyz;

        switch (insn & 0x100f)

          {

            case 0x0000: xyz = "Z";  break;

            case 0x1001: xyz = "Z+"; break;

            case 0x1002: xyz = "-Z"; break;

            case 0x0008: xyz = "Y";  break;

            case 0x1009: xyz = "Y+"; break;

            case 0x100a: xyz = "-Y"; break;

            case 0x100c: xyz = "X";  break;

            case 0x100d: xyz = "X+"; break;

            case 0x100e: xyz = "-X"; break;

            default: xyz = "??"; ok = 0;

          }

        strcpy (buf, xyz);

        if (AVR_UNDEF_P (insn))

          sprintf (comment, _("undefined"));

      }

      break;

    case 'z':

      *buf++ = 'Z';

      if (insn & 0x1)

        *buf++ = '+';

      *buf = '\0';

      if (AVR_UNDEF_P (insn))

        sprintf (comment, _("undefined"));

      break;

    case 'b':

      {

        unsigned int x;

        x = (insn & 7);

        x |= (insn >> 7) & (3 << 3);

        x |= (insn >> 8) & (1 << 5);

        if (insn & 0x8)

          *buf++ = 'Y';

        else

          *buf++ = 'Z';

        sprintf (buf, "+%d", x);

        sprintf (comment, "0x%02x", x);

      }

      break;

    case 'h':

      *sym = 1;

      *sym_addr = ((((insn & 1) | ((insn & 0x1f0) >> 3)) << 16) | insn2) * 2;

      /* See PR binutils/2454.  Ideally we would like to display the hex

         value of the address only once, but this would mean recoding

         objdump_print_address() which would affect many targets.  */

      sprintf (buf, "%#lx", (unsigned long) *sym_addr);

      strcpy (comment, comment_start);

      break;

    case 'L':

      {

        int rel_addr = (((insn & 0xfff) ^ 0x800) - 0x800) * 2;

        sprintf (buf, ".%+-8d", rel_addr);

        *sym = 1;

        *sym_addr = pc + 2 + rel_addr;

        strcpy (comment, comment_start);

      }

      break;

    case 'l':

      {

        int rel_addr = ((((insn >> 3) & 0x7f) ^ 0x40) - 0x40) * 2;

        sprintf (buf, ".%+-8d", rel_addr);

        *sym = 1;

        *sym_addr = pc + 2 + rel_addr;

        strcpy (comment, comment_start);

      }

      break;

    case 'i':

      sprintf (buf, "0x%04X", insn2);

      break;

    case 'M':

      sprintf (buf, "0x%02X", ((insn & 0xf00) >> 4) | (insn & 0xf));

      sprintf (comment, "%d", ((insn & 0xf00) >> 4) | (insn & 0xf));

      break;

    case 'n':

      sprintf (buf, "??");

      fprintf (stderr, _("Internal disassembler error"));

      ok = 0;

      break;

    case 'K':

      {

        unsigned int x;

        x = (insn & 0xf) | ((insn >> 2) & 0x30);

        sprintf (buf, "0x%02x", x);

        sprintf (comment, "%d", x);

      }

      break;

    case 's':

      sprintf (buf, "%d", insn & 7);

      break;

    case 'S':

      sprintf (buf, "%d", (insn >> 4) & 7);

      break;

    case 'P':

      {

        unsigned int x;

        x = (insn & 0xf);

        x |= (insn >> 5) & 0x30;

        sprintf (buf, "0x%02x", x);

        sprintf (comment, "%d", x);

      }

      break;

    case 'p':

      {

        unsigned int x;

        x = (insn >> 3) & 0x1f;

        sprintf (buf, "0x%02x", x);

        sprintf (comment, "%d", x);

      }

      break;

    case '?':

      *buf = '\0';

      break;

    default:

      sprintf (buf, "??");

      fprintf (stderr, _("unknown constraint `%c'"), constraint);

      ok = 0;

    }

    return ok;

}

static unsigned short

avrdis_opcode (bfd_vma addr, disassemble_info *info)

{

  bfd_byte buffer[2];

  int status;

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

  if (status == 0)

    return bfd_getl16 (buffer);

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

  return -1;

}

int

print_insn_avr (bfd_vma addr, disassemble_info *info)

{

  unsigned int insn, insn2;

  const struct avr_opcodes_s *opcode;

  static unsigned int *maskptr;

  void *stream = info->stream;

  fprintf_ftype prin = info->fprintf_func;

  static unsigned int *avr_bin_masks;

  static int initialized;

  int cmd_len = 2;

  int ok = 0;

  char op1[20], op2[20], comment1[40], comment2[40];

  int sym_op1 = 0, sym_op2 = 0;

  bfd_vma sym_addr1, sym_addr2;

  if (!initialized)

    {

      unsigned int nopcodes;

      /* PR 4045: Try to avoid duplicating the 0x prefix that

         objdump_print_addr() will put on addresses when there

         is no symbol table available.  */

      if (info->symtab_size == 0)

        comment_start = " ";

      nopcodes = sizeof (avr_opcodes) / sizeof (struct avr_opcodes_s);

      avr_bin_masks = xmalloc (nopcodes * sizeof (unsigned int));

      for (opcode = avr_opcodes, maskptr = avr_bin_masks;

           opcode->name;

           opcode++, maskptr++)

        {

          char * s;

          unsigned int bin = 0;

          unsigned int mask = 0;

          for (s = opcode->opcode; *s; ++s)

            {

              bin <<= 1;

              mask <<= 1;

              bin |= (*s == '1');

              mask |= (*s == '1' || *s == '0');

            }

          assert (s - opcode->opcode == 16);

          assert (opcode->bin_opcode == bin);

          *maskptr = mask;

        }

      initialized = 1;

    }

  insn = avrdis_opcode (addr, info);

  for (opcode = avr_opcodes, maskptr = avr_bin_masks;

       opcode->name;

       opcode++, maskptr++)

    if ((insn & *maskptr) == opcode->bin_opcode)

      break;

  /* Special case: disassemble `ldd r,b+0' as `ld r,b', and

     `std b+0,r' as `st b,r' (next entry in the table).  */

  if (AVR_DISP0_P (insn))

    opcode++;

  op1[0] = 0;

  op2[0] = 0;

  comment1[0] = 0;

  comment2[0] = 0;

  if (opcode->name)

    {

      char *op = opcode->constraints;

      insn2 = 0;

      ok = 1;

      if (opcode->insn_size > 1)

        {

          insn2 = avrdis_opcode (addr + 2, info);

          cmd_len = 4;

        }

      if (*op && *op != '?')

        {

          int regs = REGISTER_P (*op);

          ok = avr_operand (insn, insn2, addr, *op, op1, comment1, 0, &sym_op1, &sym_addr1);

          if (ok && *(++op) == ',')

            ok = avr_operand (insn, insn2, addr, *(++op), op2,

                              *comment1 ? comment2 : comment1, regs, &sym_op2, &sym_addr2);

        }

    }

  if (!ok)

    {

      /* Unknown opcode, or invalid combination of operands.  */

      sprintf (op1, "0x%04x", insn);

      op2[0] = 0;

      sprintf (comment1, "????");

      comment2[0] = 0;

    }

  (*prin) (stream, "%s", ok ? opcode->name : ".word");

  if (*op1)

      (*prin) (stream, "\t%s", op1);

  if (*op2)

    (*prin) (stream, ", %s", op2);

  if (*comment1)

    (*prin) (stream, "\t; %s", comment1);

  if (sym_op1)

    info->print_address_func (sym_addr1, info);

  if (*comment2)

    (*prin) (stream, " %s", comment2);

  if (sym_op2)

    info->print_address_func (sym_addr2, info);

  return cmd_len;

}