lib/i386/em/em_inn.s

   1 .sect .text; .sect .rom; .sect .data; .sect .bss
   2 .sect .text
   3 .define .inn
   4
   5         ! #bytes in ecx
   6         ! bit # in eax
   7 .inn:
   8         xor     edx,edx
   9         mov     ebx,8
  10         div     ebx
  11         mov     ebx,esp
  12         add     ebx,4
  13         add     ebx,eax
  14         cmp     eax,ecx
  15         jae     1f
  16         movb    al,(ebx)
  17         mov     ebx,edx
  18         testb   al,bits(ebx)
  19         jz      1f
  20         mov     eax,1
  21         jmp     2f
  22 1:
  23         xor     eax,eax
  24 2:
  25         pop     ebx
  26         add     esp,ecx
  27         ! eax is result
  28         jmp     ebx
  29
  30         .sect .rom
  31 bits:
  32         .data1 1,2,4,8,16,32,64,128