Fix disassembly of RX zero-offset register indirect instructions.

[deliverable/binutils-gdb.git] / opcodes / rx-dis.c

/* Disassembler code for Renesas RX.
   Copyright (C) 2008-2015 Free Software Foundation, Inc.
   Contributed by Red Hat.
   Written by DJ Delorie.

   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 "sysdep.h"
#include <stdio.h>

#include "bfd.h"
#include "dis-asm.h"
#include "opcode/rx.h"

typedef struct
{
  bfd_vma pc;
  disassemble_info * dis;
} RX_Data;

static int
rx_get_byte (void * vdata)
{
  bfd_byte buf[1];
  RX_Data *rx_data = (RX_Data *) vdata;

  rx_data->dis->read_memory_func (rx_data->pc,
				  buf,
				  1,
				  rx_data->dis);

  rx_data->pc ++;
  return buf[0];
}

static char const * size_names[RX_MAX_SIZE] =
{
  "", ".b", ".ub", ".b", ".w", ".uw", ".w", ".a", ".l", "<error>"
};

static char const * opsize_names[RX_MAX_SIZE] =
{
  "", ".b", ".b", ".b", ".w", ".w", ".w", ".a", ".l", "<error>"
};

static char const * register_names[] =
{
  /* general registers */
  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
  /* control register */
  "psw", "pc", "usp", "fpsw", NULL, NULL, NULL, NULL,
  "bpsw", "bpc", "isp", "fintv", "intb", NULL, NULL, NULL,
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
  NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};

static char const * condition_names[] =
{
  /* condition codes */
  "eq", "ne", "c", "nc", "gtu", "leu", "pz", "n",
  "ge", "lt", "gt", "le", "o", "no", "always", "never"
};

static const char * flag_names[] =
{
  "c", "z", "s", "o", "", "", "", "",
  "", "", "", "", "", "", "", "",
  "i", "u", "", "", "", "", "", ""
  "", "", "", "", "", "", "", "",
};

int
print_insn_rx (bfd_vma addr, disassemble_info * dis)
{
  int rv;
  RX_Data rx_data;
  RX_Opcode_Decoded opcode;
  const char * s;

  rx_data.pc = addr;
  rx_data.dis = dis;

  rv = rx_decode_opcode (addr, &opcode, rx_get_byte, &rx_data);

  dis->bytes_per_line = 10;

#define PR (dis->fprintf_func)
#define PS (dis->stream)
#define PC(c) PR (PS, "%c", c)

  /* Detect illegal instructions.  */
  if (opcode.op[0].size == RX_Bad_Size
      || register_names [opcode.op[0].reg] == NULL
      || register_names [opcode.op[1].reg] == NULL
      || register_names [opcode.op[2].reg] == NULL)
    {
      bfd_byte buf[10];
      int i;

      PR (PS, ".byte ");
      rx_data.dis->read_memory_func (rx_data.pc - rv, buf, rv, rx_data.dis);
      
      for (i = 0 ; i < rv; i++)
	PR (PS, "0x%02x ", buf[i]);
      return rv;
    }
      
  for (s = opcode.syntax; *s; s++)
    {
      if (*s != '%')
	{
	  PC (*s);
	}
      else
	{
	  RX_Opcode_Operand * oper;
	  int do_size = 0;
	  int do_hex = 0;
	  int do_addr = 0;

	  s ++;

	  if (*s == 'S')
	    {
	      do_size = 1;
	      s++;
	    }
	  if (*s == 'x')
	    {
	      do_hex = 1;
	      s++;
	    }
	  if (*s == 'a')
	    {
	      do_addr = 1;
	      s++;
	    }

	  switch (*s)
	    {
	    case '%':
	      PC ('%');
	      break;

	    case 's':
	      PR (PS, "%s", opsize_names[opcode.size]);
	      break;

	    case '0':
	    case '1':
	    case '2':
	      oper = opcode.op + *s - '0';
	      if (do_size)
		{
		  if (oper->type == RX_Operand_Indirect || oper->type == RX_Operand_Zero_Indirect)
		    PR (PS, "%s", size_names[oper->size]);
		}
	      else
		switch (oper->type)
		  {
		  case RX_Operand_Immediate:
		    if (do_addr)
		      dis->print_address_func (oper->addend, dis);
		    else if (do_hex
			     || oper->addend > 999
			     || oper->addend < -999)
		      PR (PS, "%#x", oper->addend);
		    else
		      PR (PS, "%d", oper->addend);
		    break;
		  case RX_Operand_Register:
		  case RX_Operand_TwoReg:
		    PR (PS, "%s", register_names[oper->reg]);
		    break;
		  case RX_Operand_Indirect:
		    PR (PS, "%d[%s]", oper->addend, register_names[oper->reg]);
		    break;
		  case RX_Operand_Zero_Indirect:
		    PR (PS, "[%s]", register_names[oper->reg]);
		    break;
		  case RX_Operand_Postinc:
		    PR (PS, "[%s+]", register_names[oper->reg]);
		    break;
		  case RX_Operand_Predec:
		    PR (PS, "[-%s]", register_names[oper->reg]);
		    break;
		  case RX_Operand_Condition:
		    PR (PS, "%s", condition_names[oper->reg]);
		    break;
		  case RX_Operand_Flag:
		    PR (PS, "%s", flag_names[oper->reg]);
		    break;
		  default:
		    PR (PS, "[???]");
		    break;
		  }
	    }
	}
    }

  return rv;
}