Author Topic: STDCALL unpluged  (Read 10056 times)

Offline TightCoderEx

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STDCALL unpluged
« on: June 06, 2012, 02:25:19 AM »
A lot of times I'll preserve registers above frame rather than below

Code: [Select]

        push    rsi
        push    rdi
        push    rbx

        push    rbp
        mov     rbp, rsp

        ..... Function ....

        pop     rbx
        pop     rdi
        pop     rsi

This alleviates the need to know where the stack is pointing as LEAVE will fix that up.  If values were passed on stack then RET must reflect that and those parameters are accessed by RBP + 16, plus the the number of pushes * 8 or 4 if 32 bit.  This method become particularly handy when creating a dynamic array of pointers that are only needed inside procedure