1 files changed, 27 insertions, 0 deletions

diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index cc84a24c023f..f00286bd2ef9 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1501,6 +1501,33 @@ static struct insn *find_insn(unsigned char *code)
         return NULL;
 }
 
+/**
+ * insn_to_mnemonic - decode an s390 instruction
+ * @instruction: instruction to decode
+ * @buf: buffer to fill with mnemonic
+ *
+ * Decode the instruction at @instruction and store the corresponding
+ * mnemonic into @buf.
+ * @buf is left unchanged if the instruction could not be decoded.
+ * Returns:
+ *  %0 on success, %-ENOENT if the instruction was not found.
+ */
+int insn_to_mnemonic(unsigned char *instruction, char buf[8])
+{
+        struct insn *insn;
+
+        insn = find_insn(instruction);
+        if (!insn)
+                return -ENOENT;
+        if (insn->name[0] == '\0')
+                snprintf(buf, sizeof(buf), "%s",
+                         long_insn_name[(int) insn->name[1]]);
+        else
+                snprintf(buf, sizeof(buf), "%.5s", insn->name);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(insn_to_mnemonic);
+
 static int print_insn(char *buffer, unsigned char *code, unsigned long addr)
 {
         struct insn *insn;