Intel ARCHITECTURE IA-32 User Manual download pdf (Page 543)

Stack Alignment D

Example D-2 Aligned ebp-based Stack Frames

void _stdcall foo (int k)

mov ebx, esp

sub esp, 0x00000008

and esp, 0xfffffff0

add esp, 0x00000008 // esp is (8 mod 16)

foo.aligned:

push ebx // esp is (8 mod 16)

mov ebx, esp

push ebp // this slot will be

// duplicate return pt

push ebp // esp is (0 mod 16)

// (rtn,ebx,ebp,ebp)

mov ebp, [ebx + 4] // fetch return pointer

mov [esp + 4], ebp // relative to ebp

// (rtn,ebx,rtn,ebp)

mov ebp, esp // ebp is (0 mod 16)

sub esp, 28 // esp is (4 mod 16)

//see Note A

push edx // esp is (0 mod 16)

Intel ARCHITECTURE IA-32 User Manual Page 543