Inline assembly language
I am doing 64 bit migration and i need to port inline assembly code to cpp Here is he code
void ExternalFunctionCall::callFunction(ArgType resultType, void* resultBuffer)
{
// I386
// just copy the args buffer to the stack (it's already layed out correctly)
int* begin = m_argsBegin;
int* ptr = m_argsEnd;
while (ptr > begin) {
int val = *(--ptr);
__asm push val
}
}
I want to migrate this __asm push val to cpp. This function is called four times and for every call we get different values of m_argsBegin and m_argsEnd(both m_argsBegin and m_argsEnd are dynamic arrays). This while loop executes 4 times for every call of this "callFunction" function. So, in total 4x4 = 16 values are to be stored in a "CONTINUOUS memory location" this is what "__asm push val" does i guess. I need to implement this in c++ . I tried every possible way (stack, array, Lnked list, Queue even separated this into a separate asm file but none are working) Can anyone help?
I separated this inline assembly function into a separate assembly file . Here is the code:
.386
.model c,flat
public callFunction_asm
CSEG segment public 'CODE'
callFunction_asm PROC
push ebp
mov ebp, esp
mov ecx, [ebp+8] ;val
push dword ptr [ecx]
mov esp, ebp
pop ebp
RETN
callFunction_asm ENDP
CSEG ends
END
where callFunction_asm is an extern function , I declared it as:
extern "C" void callFunction_asm(int val);
and I am calling this function as:
while (ptr > begin) {
int val = *(--ptr);
callFunction_asm(val); //possible replacement
}
but even this is not working, can anyone tell where am I going wrong. I am new to assembly coding.
push
puts its operand on the stack, as well as decrementing the stack pointer.
If you looked at the stack pointer plus 1 ( 1($sp)
), you should see the value (but if you wanted it back, you'd typically use pop
).
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