lib/i386/em/em_set.s

   1 .sect .text; .sect .rom; .sect .data; .sect .bss
   2 .sect .text
   3 .define .set
   4
   5         ! #bytes in ecx
   6         ! bit # in eax
   7 .set:
   8         pop     ebx              ! return address
   9         xor     edx,edx
  10 !ifdef create set
  11         sub     esp,ecx
  12         push    ebx
  13         push    edi
  14         mov     ebx,esp
  15         xor     edi,edi
  16         sar     ecx,2
  17 1:
  18         mov     8(ebx)(edi),edx
  19         add     edi,4
  20         loop    1b
  21 !endif
  22         mov     ebx,8
  23         div     ebx
  24         cmp     eax,edi
  25         jae     2f
  26         mov     edi,edx
  27         movb    dl,bits(edi)
  28         mov     edi,esp
  29         add     edi,eax
  30         orb     8(edi),dl
  31         pop     edi
  32         ret
  33 2:
  34 .extern ESET
  35 .extern .trp
  36         pop     edi
  37         mov     eax,ESET
  38         jmp     .trp
  39
  40         .sect .rom
  41 bits:
  42         .data1   1,2,4,8,16,32,64,128