CODEWITHSUNDEEP
c++x86
n00b
n00b

Reputation: 5732

How to set zero flag

LONG WINAPI MyUnhandledExceptionFilter(PEXCEPTION_POINTERS p)
{

    if(p->ExceptionRecord->ExceptionCode==EXCEPTION_ACCESS_VIOLATION){
        if(p->ContextRecord->Eip==6F3A15FD){
            p->ContextRecord->EFlags
        }

i want my exception handler to set zero flag if exception occured in a specified address ;) how do i do it p->ContextRecord->EFlags|= ??

also if i just give EXCEPTION_CONTINUE_EXECUTION after access violation will it work ? :D and, do i have to inc the EIP or it will fall on next instruction ?

Upvotes: 3

Views: 977

Answers (1)

Alexey Frunze
Alexey Frunze

Reputation: 62086

ZF is bit 6 of EFLAGS, so EFlags |= 1 << 6;

Download Intel's or AMD's CPU manual. You'll find all this info there.

Upvotes: 5

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