binutils-gdb/opcodes/rl78-dis.c

/* Disassembler code for Renesas RL78.
   Copyright 2011, 2012 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/rl78.h"

#define DEBUG_SEMANTICS 0

typedef struct
{
  bfd_vma pc;
  disassemble_info * dis;
} RL78_Data;

static int
rl78_get_byte (void * vdata)
{
  bfd_byte buf[1];
  RL78_Data *rl78_data = (RL78_Data *) vdata;

  rl78_data->dis->read_memory_func (rl78_data->pc,
				  buf,
				  1,
				  rl78_data->dis);

  rl78_data->pc ++;
  return buf[0];
}

static char const *
register_names[] =
{
  "",
  "x", "a", "c", "b", "e", "d", "l", "h",
  "ax", "bc", "de", "hl",
  "sp", "psw", "cs", "es", "pmc", "mem"
};

static char const *
condition_names[] =
{
  "t", "f", "c", "nc", "h", "nh", "z", "nz"
};

static int
indirect_type (int t)
{
  switch (t)
    {
    case RL78_Operand_Indirect:
    case RL78_Operand_BitIndirect:
    case RL78_Operand_PostInc:
    case RL78_Operand_PreDec:
      return 1;
    default:
      return 0;
    }
}

int
print_insn_rl78 (bfd_vma addr, disassemble_info * dis)
{
  int rv;
  RL78_Data rl78_data;
  RL78_Opcode_Decoded opcode;
  const char * s;
#if DEBUG_SEMANTICS
  static char buf[200];
#endif

  rl78_data.pc = addr;
  rl78_data.dis = dis;

  rv = rl78_decode_opcode (addr, &opcode, rl78_get_byte, &rl78_data);

  dis->bytes_per_line = 10;

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

  s = opcode.syntax;

#if DEBUG_SEMANTICS

  switch (opcode.id)
    {
    case RLO_unknown: s = "uknown"; break;
    case RLO_add: s = "add: %e0%0 += %e1%1"; break;
    case RLO_addc: s = "addc: %e0%0 += %e1%1 + CY"; break;
    case RLO_and: s = "and: %e0%0 &= %e1%1"; break;
    case RLO_branch: s = "branch: pc = %e0%0"; break;
    case RLO_branch_cond: s = "branch_cond: pc = %e0%0 if %c1 / %e1%1"; break;
    case RLO_branch_cond_clear: s = "branch_cond_clear: pc = %e0%0 if %c1 / %e1%1, %e1%1 = 0"; break;
    case RLO_call: s = "call: pc = %e1%0"; break;
    case RLO_cmp: s = "cmp: %e0%0 - %e1%1"; break;
    case RLO_mov: s = "mov: %e0%0 = %e1%1"; break;
    case RLO_or: s = "or: %e0%0 |= %e1%1"; break;
    case RLO_rol: s = "rol: %e0%0 <<= %e1%1"; break;
    case RLO_rolc: s = "rol: %e0%0 <<= %e1%1,CY"; break;
    case RLO_ror: s = "ror: %e0%0 >>= %e1%1"; break;
    case RLO_rorc: s = "ror: %e0%0 >>= %e1%1,CY"; break;
    case RLO_sar: s = "sar: %e0%0 >>= %e1%1 signed"; break;
    case RLO_sel: s = "sel: rb = %1"; break;
    case RLO_shr: s = "shr: %e0%0 >>= %e1%1 unsigned"; break;
    case RLO_shl: s = "shl: %e0%0 <<= %e1%1"; break;
    case RLO_skip: s = "skip: if %c1"; break;
    case RLO_sub: s = "sub: %e0%0 -= %e1%1"; break;
    case RLO_subc: s = "subc: %e0%0 -= %e1%1 - CY"; break;
    case RLO_xch: s = "xch: %e0%0 <-> %e1%1"; break;
    case RLO_xor: s = "xor: %e0%0 ^= %e1%1"; break;
    }

  sprintf(buf, "%s%%W%%f\t\033[32m%s\033[0m", s, opcode.syntax);
  s = buf;

#endif

  for (; *s; s++)
    {
      if (*s != '%')
	{
	  PC (*s);
	}
      else
	{
	  RL78_Opcode_Operand * oper;
	  int do_hex = 0;
	  int do_addr = 0;
	  int do_es = 0;
	  int do_sfr = 0;
	  int do_cond = 0;
	  int do_bang = 0;

	  while (1)
	    {
	      s ++;
	      switch (*s)
		{
		case 'x':
		  do_hex = 1;
		  break;
		case '!':
		  do_bang = 1;
		  break;
		case 'e':
		  do_es = 1;
		  break;
		case 'a':
		  do_addr = 1;
		  break;
		case 's':
		  do_sfr = 1;
		  break;
		case 'c':
		  do_cond = 1;
		  break;
		default:
		  goto no_more_modifiers;
		}
	    }
	no_more_modifiers:;

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

#if DEBUG_SEMANTICS

	    case 'W':
	      if (opcode.size == RL78_Word)
		PR (PS, " \033[33mW\033[0m");
	      break;

	    case 'f':
	      if (opcode.flags)
		{
		  char *comma = "";
		  PR (PS, "  \033[35m");
	      
		  if (opcode.flags & RL78_PSW_Z)
		    { PR (PS, "Z"); comma = ","; }
		  if (opcode.flags & RL78_PSW_AC)
		    { PR (PS, "%sAC", comma); comma = ","; }
		  if (opcode.flags & RL78_PSW_CY)
		    { PR (PS, "%sCY", comma); comma = ","; }
		  PR (PS, "\033[0m");
		}
	      break;

#endif

	    case '0':
	    case '1':
	      oper = *s == '0' ? &opcode.op[0] : &opcode.op[1];
	    if (do_es)
	      {
		if (oper->use_es && indirect_type (oper->type))
		  PR (PS, "es:");
	      }

	    if (do_bang)
	      PC ('!');

	    if (do_cond)
	      {
		PR (PS, "%s", condition_names[oper->condition]);
		break;
	      }

	    switch (oper->type)
	      {
	      case RL78_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 RL78_Operand_Register:
		PR (PS, "%s", register_names[oper->reg]);
		break;

	      case RL78_Operand_Bit:
		PR (PS, "%s.%d", register_names[oper->reg], oper->bit_number);
		break;

	      case RL78_Operand_Indirect:
	      case RL78_Operand_BitIndirect:
		switch (oper->reg)
		  {
		  case RL78_Reg_None:
		    if (oper->addend == 0xffffa && do_sfr && opcode.size == RL78_Byte)
		      PR (PS, "psw");
		    else if (oper->addend == 0xffff8 && do_sfr && opcode.size == RL78_Word)
		      PR (PS, "sp");
		    else if (oper->addend >= 0xffe20)
		      PR (PS, "%#x", oper->addend);
		    else
		      {
			int faddr = oper->addend;
			if (do_es && ! oper->use_es)
			  faddr += 0xf0000;
			dis->print_address_func (faddr, dis);
		      }
		    break;

		  case RL78_Reg_B:
		  case RL78_Reg_C:
		  case RL78_Reg_BC:
		    PR (PS, "%d[%s]", oper->addend, register_names[oper->reg]);
		    break;

		  default:
		    PR (PS, "[%s", register_names[oper->reg]);
		    if (oper->reg2 != RL78_Reg_None)
		      PR (PS, "+%s", register_names[oper->reg2]);
		    if (oper->addend)
		      PR (PS, "+%d", oper->addend);
		    PC (']');
		    break;
		      
		  }
		if (oper->type == RL78_Operand_BitIndirect)
		  PR (PS, ".%d", oper->bit_number);
		break;

#if DEBUG_SEMANTICS
		/* Shouldn't happen - push and pop don't print
		   [SP] directly.  But we *do* use them for
		   semantic debugging.  */
	      case RL78_Operand_PostInc:
		PR (PS, "[%s++]", register_names[oper->reg]);
		break;
	      case RL78_Operand_PreDec:
		PR (PS, "[--%s]", register_names[oper->reg]);
		break;
#endif

	      default:
		/* If we ever print this, that means the
		   programmer tried to print an operand with a
		   type we don't expect.  Print the line and
		   operand number from rl78-decode.opc for
		   them.  */
		PR (PS, "???%d.%d", opcode.lineno, *s - '0');
		break;
	      }
	    }
	}
    }

#if DEBUG_SEMANTICS

  PR (PS, "\t\033[34m(line %d)\033[0m", opcode.lineno);

#endif

  return rv;
}