i386: prepare shared lib/strstr.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 31 insertions, 0 deletions

diff --git a/arch/i386/lib/strstr_32.c b/arch/i386/lib/strstr_32.c
new file mode 100644
index 0000000..a3dafbf
--- /dev/null
+++ b/arch/i386/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;
+}
+