Function testSelfModifyingMovsb

source/test/testCPU.cpp:10861–10908

}

void testSelfModifyingMovsb() {
    // initialize
    newInstruction(0);

    EDI = 0;
    ESI = 512;
    ECX = 3; // 3 bytes to copy

    // code to copy
    // sub eax, 0x05
    memory->writeb(CODE_ADDRESS + 512, 0x83);
    memory->writeb(CODE_ADDRESS + 513, 0xe8);
    memory->writeb(CODE_ADDRESS + 514, 0x05);

    cpu->setSeg(ES, CODE_ADDRESS, 1);

    // add eax, 0x20 (3 bytes)
    pushCode8(0x83);
    pushCode8(0xc0);
    pushCode8(0x20);

    // test edx, edx (2 bytes)
    pushCode8(0x85);
    pushCode8(0xd2);

    // jnz (2 bytes)
    pushCode8(0x75);
    pushCode8(0x6);

    // inc edx (1 byte)
    pushCode8(0x42);

    // modify previous block
    // movsb es:edi cs:esi (3 bytes)

    pushCode8(0xf3); // repeat
    pushCode8(0x2e); // CS source
    pushCode8(0xa4); // movsb    

    // jmp (2 bytes)
    pushCode8(0xeb);
    pushCode8(0xf3); // jmp -13

    runTestCPU();

    assertTrue(EDX == 1);
    assertTrue(EAX == 0x1b); // 0x20 from first run - 0x05 from second run
}

void testReverseBits() {
    // initialize