source: trunk/minix/lib/i386/em/em_set.s@ 9

.sect .text; .sect .rom; .sect .data; .sect .bss
.sect .text
.define .set

        ! #bytes in ecx
        ! bit # in eax
.set:
        pop     ebx              ! return address
        xor     edx,edx
!ifdef create set
        sub     esp,ecx
        push    ebx
        push    edi
        mov     ebx,esp
        xor     edi,edi
        sar     ecx,2
1:
        mov     8(ebx)(edi),edx
        add     edi,4
        loop    1b
!endif
        mov     ebx,8
        div     ebx
        cmp     eax,edi
        jae     2f
        mov     edi,edx
        movb    dl,bits(edi)
        mov     edi,esp
        add     edi,eax
        orb     8(edi),dl
        pop     edi
        ret
2:
.extern ESET
.extern .trp
        pop     edi
        mov     eax,ESET
        jmp     .trp

        .sect .rom
bits:
        .data1   1,2,4,8,16,32,64,128