1 files changed, 33 insertions, 0 deletions
diff --git a/arch/x86/lib/strstr_32.c b/arch/x86/lib/strstr_32.c
new file mode 100644
index 0000000000..38f37df056
--- /dev/null
+++ b/arch/x86/lib/strstr_32.c
@@ -0,0 +1,33 @@
+// 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);