KVM: s390: decoder of SIE intercepted instructions

[deliverable/linux.git] / arch / s390 / include / uapi / asm / sie.h

diff --git a/arch/s390/include/uapi/asm/sie.h b/arch/s390/include/uapi/asm/sie.h
index ec793e188681774eac8fe38092fb0f62d37e3d9f..3d97f610198dfb6ea1212553a1c9568b28df8f9f 100644 (file)
--- 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 */