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https://github.com/WinampDesktop/winamp.git
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51 lines
989 B
NASM
51 lines
989 B
NASM
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.686
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.model FLAT
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PUBLIC _lifo_push
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_TEXT SEGMENT
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lifo = 4 ; size = 4
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entry = 8 ; size = 4
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_lifo_push PROC
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mov ecx, DWORD PTR 4[esp] ; ecx holds lifo
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mov edx, DWORD PTR 8[esp] ; edx holds the new entry
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again:
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mov eax, DWORD PTR [ecx] ; eax holds the old head
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mov DWORD PTR[edx], eax ; new node's 'next' is set to the old head
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lock cmpxchg DWORD PTR [ecx], edx
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jnz again
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ret 0
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_lifo_push ENDP
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PUBLIC _lifo_pop
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_TEXT SEGMENT
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lifo = 4 ; size = 4
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_lifo_pop PROC
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push esi
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push ebx
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mov esi, DWORD PTR 12[esp] ; esi holds lifo
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again:
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; if re-ordered loads become an issue, we could use cmpxchg8b to read in (after zeroing ebx/ecx) or maybe use movq
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mov edx, DWORD PTR [esi+4] ; counter
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; or we could put an LFENCE here
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mov eax, DWORD PTR [esi] ; pointer
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test eax, eax
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jz bail
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mov ecx, edx ; counter
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mov ebx, DWORD PTR [eax] ; pointer->next
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inc ecx
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lock cmpxchg8b QWORD PTR [esi]
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jnz again
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bail:
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pop ebx
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pop esi
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ret 0
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_lifo_pop ENDP
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_TEXT ENDS
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END
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