diff options
Diffstat (limited to 'kernel/arch/x86/lib/strstr_32.c')
| -rw-r--r-- | kernel/arch/x86/lib/strstr_32.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/kernel/arch/x86/lib/strstr_32.c b/kernel/arch/x86/lib/strstr_32.c new file mode 100644 index 000000000..8e2d55f75 --- /dev/null +++ b/kernel/arch/x86/lib/strstr_32.c @@ -0,0 +1,31 @@ +#include <linux/string.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; +} + |