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| // SPDX-License-Identifier: GPL-2.0
| #include <linux/string.h>
| #include <linux/export.h>
|
| char *strstr(const char *cs, const char *ct)
| {
| int d0, d1;
| register char *__res;
| __asm__ __volatile__(
| "movl %6,%%edi\n\t"
| "repne\n\t"
| "scasb\n\t"
| "notl %%ecx\n\t"
| "decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */
| "movl %%ecx,%%edx\n"
| "1:\tmovl %6,%%edi\n\t"
| "movl %%esi,%%eax\n\t"
| "movl %%edx,%%ecx\n\t"
| "repe\n\t"
| "cmpsb\n\t"
| "je 2f\n\t" /* also works for empty string, see above */
| "xchgl %%eax,%%esi\n\t"
| "incl %%esi\n\t"
| "cmpb $0,-1(%%eax)\n\t"
| "jne 1b\n\t"
| "xorl %%eax,%%eax\n\t"
| "2:"
| : "=a" (__res), "=&c" (d0), "=&S" (d1)
| : "0" (0), "1" (0xffffffff), "2" (cs), "g" (ct)
| : "dx", "di");
| return __res;
| }
| EXPORT_SYMBOL(strstr);
|
|
