bionic/libc/arch-x86/string/index.S

   1 /*      $OpenBSD: index.S,v 1.4 2005/08/07 11:30:38 espie Exp $ */
   2 /*
   3  * Written by J.T. Conklin <jtc@netbsd.org>.
   4  * Public domain.
   5  */
   6
   7 #include <machine/asm.h>
   8
   9 #ifdef STRCHR
  10 ENTRY(strchr)
  11 #else
  12 ENTRY(index)
  13 #endif
  14         movl    4(%esp),%eax
  15         movb    8(%esp),%cl
  16         .align 2,0x90
  17 L1:
  18         movb    (%eax),%dl
  19         cmpb    %dl,%cl                 /* found char??? */
  20         je      L2
  21         incl    %eax
  22         testb   %dl,%dl                 /* null terminator??? */
  23         jnz     L1
  24         xorl    %eax,%eax
  25 L2:
  26         ret