binutils-gdb/opcodes/v850-dis.c

/* Disassemble V850 instructions.
   Copyright (C) 1996 Free Software Foundation, Inc.

This program 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 2 of the License, or
(at your option) any later version.

This program 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */


#include <stdio.h>

#include "ansidecl.h"
#include "opcode/v850.h" 
#include "dis-asm.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", "r31" };

static const char *const v850_sreg_names[] =
{ "eipc", "eipsw", "fepc", "fepsw", "ecr", "psw", "sr6", "sr7", 
  "sr8", "sr9", "sr10", "sr11", "sr12", "sr13", "sr14", "sr15", 
  "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 (memaddr, info, insn)
     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;


  /* Special case: 32 bit MOV */
  if ((insn & 0xffe0) == 0x0620)
    short_op = true;
      
  bytes_read = short_op ? 2 : 4;
  
  /* If this is a two byte insn, then mask off the high bits. */
  if (short_op)
    insn &= 0xffff;

  /* Find the opcode.  */
  while (op->name)
    {
      if ((op->mask & insn) == op->opcode)
	{
	  const unsigned char * opindex_ptr;
	  unsigned int          opnum;
	  unsigned int          memop;

	  match = 1;
	  (*info->fprintf_func) (info->stream, "%s\t", op->name);
//fprintf (stderr, "match: mask: %x insn: %x, opcode: %x, name: %s\n", op->mask, insn, op->opcode, 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;
		case V850_OPERAND_DISP: info->print_address_func (value + memaddr, info); break;
		default:                info->fprintf_func (info->stream, "%d", value); break;
/* start-sanitize-v850e */
		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 };
/* start-sanitize-v850eq */
		    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 };
/* end-sanitize-v850eq */
		    int *             regs;
		    int               i;
		    unsigned long int mask = 0;
		    int               pc   = false;
		    int               sr   = false;
		    
		    
		    switch (operand->shift)
		      {
		      case 0xffe00001: regs = list12_regs; break;
/* start-sanitize-v850eq */
		      case 0xfff8000f: regs = list18_h_regs; break;
		      case 0xfff8001f: regs = list18_l_regs; value &= ~0x10; break;  /* Do not include magic bit */
/* end-sanitize-v850eq */
		      default:
			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;
/* start-sanitize-v850eq */
			      case 0:  fprintf (stderr, "unknown pop reg: %d\n", i ); abort();
			      case -1: pc = true; break;
			      case -2: sr = true; break;
/* end-sanitize-v850eq */
			      }
			  }
		      }

		    info->fprintf_func (info->stream, "{");
		    
		    if (mask || pc || sr)
		      {
			if (mask)
			  {
			    unsigned int bit;
			    int          shown_one = false;
			    
			    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 = true;
				  
				  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%x", 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;
/* end-sanitize-v850e */
		}		  

	      /* 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%04x", insn);
      else
	info->fprintf_func (info->stream, ".long\t0x%08x", insn);
    }

  return bytes_read;
}

int 
print_insn_v850 (memaddr, info)
     bfd_vma memaddr;
     struct disassemble_info * info;
{
  int           status;
  bfd_byte      buffer[ 4 ];
  unsigned long insn;

  /* 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);
}