📄 m68kbrain.c
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#include <stdio.h>
#include <stdlib.h>
#include "M68kBrain.h"
#include "m68k.h"
#include "../../misc.h"
/*
* DummyBrain is example how you create you own cpu brain to translate from
* cpu to intel assembler, I have not add DummyBrain to the loader it is not
* need it in our example. When you write you own brain, it must be setup in
* misc.c function LoadPFileImage and PEFileStart, PEFileStart maybe does not
* need the brain you have writen so you do not need setup it there then.
*
* input param:
* cpu_buffer : the memory buffer with loaded program we whant translate
* cpu_pos : the positions in the cpu_buffer
* cpu_size : the alloced memory size of the cpu_buffer
* BaseAddress : the virtual memory address we setup to use.
* cpuarch : the sub arch for the brain, example if it exists more one
* cpu with same desgin but few other opcode or extend opcode
* outfp : the output file pointer
*
* return value
* 0 : Ok
* 1 : unimplemt
* 2 : Unkonwn Opcode
* 3 : unimplement cpu
* 4 : unknown machine
*/
CPU_INT M68KBrain( CPU_BYTE *cpu_buffer,
CPU_UNINT cpu_pos,
CPU_UNINT cpu_size,
CPU_UNINT BaseAddress,
CPU_UNINT cpuarch,
FILE *outfp)
{
CPU_UNINT cpu_oldpos;
CPU_INT cpuint;
CPU_INT retcode = 0;
CPU_INT retsize;
/* now we start the process */
while (cpu_pos<cpu_size)
{
cpu_oldpos = cpu_pos;
cpuint = cpu_buffer[cpu_pos];
/* Abcd */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Abcd))) == ConvertBitToByte(cpuM68kInit_Abcd))
{
retsize = M68k_Abcd( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Add */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Add))) == ConvertBitToByte(cpuM68kInit_Add))
{
retsize = M68k_Add( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Addi */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Addi))) == ConvertBitToByte(cpuM68kInit_Addi))
{
retsize = M68k_Addi( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Addq */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Addq))) == ConvertBitToByte(cpuM68kInit_Addq))
{
retsize = M68k_Addq( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Addx */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Addx))) == ConvertBitToByte(cpuM68kInit_Addx))
{
retsize = M68k_Addx( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* And */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_And))) == ConvertBitToByte(cpuM68kInit_And))
{
retsize = M68k_Add( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Andi */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Andi))) == ConvertBitToByte(cpuM68kInit_Andi))
{
retsize = M68k_Andi( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* AndToCCR */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_AndToCCRF))) == ConvertBitToByte(cpuM68kInit_AndToCCRF))
{
cpuint = cpu_buffer[cpu_pos+1];
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_AndToCCRS))) == ConvertBitToByte(cpuM68kInit_AndToCCRS))
{
cpu_pos++;
retsize = M68k_AndToCCR( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
else
{
cpuint = cpu_buffer[cpu_pos];
}
}
/* Bhi */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bhi))) == ConvertBitToByte(cpuM68kInit_Bhi))
{
retsize = M68k_Bhi( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bls */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bls))) == ConvertBitToByte(cpuM68kInit_Bls))
{
retsize = M68k_Bls( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bcc */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bcc))) == ConvertBitToByte(cpuM68kInit_Bcc))
{
retsize = M68k_Bcc( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bcs */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bcs))) == ConvertBitToByte(cpuM68kInit_Bcs))
{
retsize = M68k_Bcs( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bne */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bne))) == ConvertBitToByte(cpuM68kInit_Bne))
{
retsize = M68k_Bne( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Beq */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Beq))) == ConvertBitToByte(cpuM68kInit_Beq))
{
retsize = M68k_Beq( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bvc */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bvc))) == ConvertBitToByte(cpuM68kInit_Bvc))
{
retsize = M68k_Bvc( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bvs */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bvs))) == ConvertBitToByte(cpuM68kInit_Bvs))
{
retsize = M68k_Bvs( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bpl */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bpl))) == ConvertBitToByte(cpuM68kInit_Bpl))
{
retsize = M68k_Bpl( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bmi */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bmi))) == ConvertBitToByte(cpuM68kInit_Bmi))
{
retsize = M68k_Bmi( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bge */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bge))) == ConvertBitToByte(cpuM68kInit_Bge))
{
retsize = M68k_Bge( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Blt */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Blt))) == ConvertBitToByte(cpuM68kInit_Blt))
{
retsize = M68k_Blt( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Bgt */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Bgt))) == ConvertBitToByte(cpuM68kInit_Bgt))
{
retsize = M68k_Bgt( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Ble */
if ((cpuint - (cpuint & GetMaskByte(cpuM68kInit_Ble))) == ConvertBitToByte(cpuM68kInit_Ble))
{
retsize = M68k_Ble( outfp, cpu_buffer, cpu_pos, cpu_size,
BaseAddress, cpuarch);
if (retsize<0)
retcode = 1;
else
cpu_pos += retsize;
}
/* Found all Opcode and breakout and return no error found */
if (cpu_pos >=cpu_size)
{
break;
}
/* Check if we have found a cpu opcode */
if (cpu_oldpos == cpu_pos)
{
if (retcode == 0)
{
/* no unimplement error where found so we return a msg for unknown opcode */
printf("Unkonwn Opcode found at 0x%8x opcode 0x%2x\n",cpu_oldpos+BaseAddress,(unsigned int)cpu_buffer[cpu_oldpos]);
retcode = 2;
}
}
/* Erorro Found ? */
if (retcode!=0)
{
/* Erorro Found break and return the error code */
break;
}
}
return retcode;
}
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