Function common_cmpxchg8b_lock

source/emulation/cpu/common/common_lock.cpp:39–71

U64 value1 = ((U64)EDX) << 32 | EAX; U64 value2 = cpu->memory->readq(address); cpu->fillFlags(); if (value1 == value2) { cpu->addZF(); cpu->memory->writed(address, EBX); cpu->memory->writed(address + 4, ECX); } else { cpu->removeZF(); EDX = (U32)(value2 >> 32); EAX = (U32)value2; } */

    }
*/
void common_cmpxchg8b_lock(CPU* cpu, U32 address) {
    U64 expected = ((U64)EDX) << 32 | EAX;
    if (address & 7) {
        BOXEDWINE_CRITICAL_SECTION_WITH_MUTEX(lockMutex); // hope for the best

        U64 oldValue = cpu->memory->readq(address);
        cpu->fillFlags();
        if (expected == oldValue) {
            cpu->addZF();
            cpu->memory->writed(address, EBX);
            cpu->memory->writed(address + 4, ECX);
        } else {
            cpu->removeZF();
            EDX = (U32)(oldValue >> 32);
            EAX = (U32)oldValue;
        }
    } else {
        U64 value = ((U64)ECX) << 32 | EBX;

        cpu->fillFlags();

        LockData64* p = (LockData64*)cpu->memory->getRamPtr(address, 8, true);
        std::atomic_ref<U64> mem(p->data);

        if (mem.compare_exchange_strong(expected, value)) {
            cpu->addZF();
        } else {
            cpu->removeZF();
            EDX = (U32)(expected >> 32);
            EAX = (U32)expected;
        }
    }
}

/*
    cpu->dst.u32 = EAX;