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108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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#include "IA32Brain.h"
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#include "IA32.h"
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#include "../../any_op.h"
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#include "../../misc.h"
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/*
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* DummyBrain is example how you create you own cpu brain to translate from
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* cpu to intel assembler, I have not add DummyBrain to the loader it is not
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* need it in our example. When you write you own brain, it must be setup in
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* misc.c function LoadPFileImage and PEFileStart, PEFileStart maybe does not
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* need the brain you have writen so you do not need setup it there then.
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*
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* input param:
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* cpu_buffer : the memory buffer with loaded program we whant translate
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* cpu_pos : the positions in the cpu_buffer
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* cpu_size : the alloced memory size of the cpu_buffer
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* BaseAddress : the virtual memory address we setup to use.
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* cpuarch : the sub arch for the brain, example if it exists more one
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* cpu with same desgin but few other opcode or extend opcode
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* outfp : the output file pointer
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*
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* mode : if we should run disambler of this binary or
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* translate it, Disambler will not calc the
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* the row name right so we simple give each
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row a name. In translations mode we run a
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* analys so we getting better optimzing and
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* only row name there we need.
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* value for mode are :
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* 0 = disambler mode
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* 1 = translate mode intel
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*
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* return value
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* 0 : Ok
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* 1 : unimplemt
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* 2 : Unkonwn Opcode
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* 3 : unimplement cpu
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* 4 : unknown machine
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*/
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CPU_INT IA32Brain( CPU_BYTE *cpu_buffer,
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CPU_UNINT cpu_pos,
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CPU_UNINT cpu_size,
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CPU_UNINT BaseAddress,
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CPU_UNINT cpuarch,
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FILE *outfp)
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{
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CPU_UNINT cpu_oldpos;
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CPU_INT cpuint;
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CPU_INT retcode = 0;
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CPU_INT retsize;
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/* now we start the process */
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while (cpu_pos<cpu_size)
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{
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cpu_oldpos = cpu_pos;
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/* use the GetData32Be or GetData32Le
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to read from the memory the
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Le is for small endian and the
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Be is for big endian
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the 32 is how many bits we should read
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*/
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cpuint = GetData32Be(&cpu_buffer[cpu_pos]);
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/* Add */
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if ((cpuint - (cpuint & GetMaskByte(cpuIA32Init_Add))) == ConvertBitToByte(cpuIA32Init_Add))
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{
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retsize = IA32_Add( outfp, cpu_buffer, cpu_pos, cpu_size,
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BaseAddress, cpuarch);
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if (retsize<0)
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retcode = 1;
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else
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cpu_pos += retsize;
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}
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/* Found all Opcode and breakout and return no error found */
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if (cpu_pos >=cpu_size)
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{
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break;
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}
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/* Check if we have found a cpu opcode */
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if (cpu_oldpos == cpu_pos)
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{
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if (retcode == 0)
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{
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/* no unimplement error where found so we return a msg for unknown opcode */
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printf("Unkonwn Opcode found at 0x%8x opcode 0x%2x\n",cpu_oldpos+BaseAddress,(unsigned int)cpu_buffer[cpu_oldpos]);
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retcode = 2;
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}
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}
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/* Erorro Found ? */
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if (retcode!=0)
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{
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/* Erorro Found break and return the error code */
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break;
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}
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}
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return retcode;
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}
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