1 #include <linux/string.h> 2 3 char *strstr(const char *cs, const char *ct) 4 { 5 int d0, d1; 6 register char *__res; 7 __asm__ __volatile__( 8 "movl %6,%%edi\n\t" 9 "repne\n\t" 10 "scasb\n\t" 11 "notl %%ecx\n\t" 12 "decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */ 13 "movl %%ecx,%%edx\n" 14 "1:\tmovl %6,%%edi\n\t" 15 "movl %%esi,%%eax\n\t" 16 "movl %%edx,%%ecx\n\t" 17 "repe\n\t" 18 "cmpsb\n\t" 19 "je 2f\n\t" /* also works for empty string, see above */ 20 "xchgl %%eax,%%esi\n\t" 21 "incl %%esi\n\t" 22 "cmpb $0,-1(%%eax)\n\t" 23 "jne 1b\n\t" 24 "xorl %%eax,%%eax\n\t" 25 "2:" 26 : "=a" (__res), "=&c" (d0), "=&S" (d1) 27 : "0" (0), "1" (0xffffffff), "2" (cs), "g" (ct) 28 : "dx", "di"); 29 return __res; 30 } 31 32