1 files changed, 33 insertions, 0 deletions

diff --git a/arch/s390/include/uapi/asm/sie.h b/arch/s390/include/uapi/asm/sie.h
index ec793e188681..3d97f610198d 100644
--- a/arch/s390/include/uapi/asm/sie.h
+++ b/arch/s390/include/uapi/asm/sie.h
@@ -209,4 +209,37 @@
         { 0x40, "I/O instruction" },                            \
         { 0x48, "Timing subset" }
 
+/*
+ * This is the simple interceptable instructions decoder.
+ *
+ * It will be used as userspace interface and it can be used in places
+ * that does not allow to use general decoder functions,
+ * such as trace events declarations.
+ *
+ * Some userspace tools may want to parse this code
+ * and would be confused by switch(), if() and other statements,
+ * but they can understand conditional operator.
+ */
+#define INSN_DECODE_IPA0(ipa0, insn, rshift, mask)              \
+        (insn >> 56) == (ipa0) ?                                \
+                ((ipa0 << 8) | ((insn >> rshift) & mask)) :
+
+#define INSN_DECODE(insn) (insn >> 56)
+
+/*
+ * The macro icpt_insn_decoder() takes an intercepted instruction
+ * and returns a key, which can be used to find a mnemonic name
+ * of the instruction in the icpt_insn_codes table.
+ */
+#define icpt_insn_decoder(insn)                 \
+        INSN_DECODE_IPA0(0x01, insn, 48, 0xff)  \
+        INSN_DECODE_IPA0(0xaa, insn, 48, 0x0f)  \
+        INSN_DECODE_IPA0(0xb2, insn, 48, 0xff)  \
+        INSN_DECODE_IPA0(0xb9, insn, 48, 0xff)  \
+        INSN_DECODE_IPA0(0xe3, insn, 48, 0xff)  \
+        INSN_DECODE_IPA0(0xe5, insn, 48, 0xff)  \
+        INSN_DECODE_IPA0(0xeb, insn, 16, 0xff)  \
+        INSN_DECODE_IPA0(0xc8, insn, 48, 0x0f)  \
+        INSN_DECODE(insn)
+
 #endif /* _UAPI_ASM_S390_SIE_H */