[llvm] [clang] [RISCV] Add MC layer support for Zicfiss. (PR #66043)
Yeting Kuo via cfe-commits
cfe-commits at lists.llvm.org
Wed Dec 13 00:22:10 PST 2023
https://github.com/yetingk updated https://github.com/llvm/llvm-project/pull/66043
>From 01222b781e3a0a925d2cdf793c54c7d6050f82af Mon Sep 17 00:00:00 2001
From: Yeting Kuo <yeting.kuo at sifive.com>
Date: Tue, 12 Sep 2023 12:28:00 +0800
Subject: [PATCH] [RISCV] Add MC layer support for Zicfiss.
The patch adds the instructions in Zicfiss extension. Zicfiss extension is
to support shadow stack for control flow integrity.
Differential Revision: https://reviews.llvm.org/D152793
---
.../test/Preprocessor/riscv-target-features.c | 9 ++
llvm/docs/RISCVUsage.rst | 2 +-
llvm/lib/Support/RISCVISAInfo.cpp | 2 +
.../RISCV/Disassembler/RISCVDisassembler.cpp | 25 +++++
llvm/lib/Target/RISCV/RISCVFeatures.td | 7 ++
llvm/lib/Target/RISCV/RISCVInstrInfo.td | 9 +-
.../lib/Target/RISCV/RISCVInstrInfoZicfiss.td | 71 ++++++++++++
llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp | 3 +
llvm/lib/Target/RISCV/RISCVRegisterInfo.td | 9 ++
llvm/test/MC/RISCV/attribute-arch.s | 3 +
llvm/test/MC/RISCV/compressed-zicfiss.s | 53 +++++++++
llvm/test/MC/RISCV/rv32zicfiss-invalid.s | 17 +++
llvm/test/MC/RISCV/rv64zicfiss-invalid.s | 17 +++
llvm/test/MC/RISCV/zicfiss-valid.s | 102 ++++++++++++++++++
llvm/unittests/Support/RISCVISAInfoTest.cpp | 1 +
15 files changed, 325 insertions(+), 5 deletions(-)
create mode 100644 llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
create mode 100644 llvm/test/MC/RISCV/compressed-zicfiss.s
create mode 100644 llvm/test/MC/RISCV/rv32zicfiss-invalid.s
create mode 100644 llvm/test/MC/RISCV/rv64zicfiss-invalid.s
create mode 100644 llvm/test/MC/RISCV/zicfiss-valid.s
diff --git a/clang/test/Preprocessor/riscv-target-features.c b/clang/test/Preprocessor/riscv-target-features.c
index 35208b2eae8fb..a480877dc5f2a 100644
--- a/clang/test/Preprocessor/riscv-target-features.c
+++ b/clang/test/Preprocessor/riscv-target-features.c
@@ -119,6 +119,7 @@
// CHECK-NOT: __riscv_zfa {{.*$}}
// CHECK-NOT: __riscv_zfbfmin {{.*$}}
// CHECK-NOT: __riscv_zicfilp {{.*$}}
+// CHECK-NOT: __riscv_zicfiss {{.*$}}
// CHECK-NOT: __riscv_zicond {{.*$}}
// CHECK-NOT: __riscv_ztso {{.*$}}
// CHECK-NOT: __riscv_zvbb {{.*$}}
@@ -1278,3 +1279,11 @@
// RUN: %clang --target=riscv64-unknown-linux-gnu -march=rv64i -E -dM %s \
// RUN: -munaligned-access -o - | FileCheck %s --check-prefix=CHECK-MISALIGNED-FAST
// CHECK-MISALIGNED-FAST: __riscv_misaligned_fast 1
+
+// RUN: %clang -target riscv32 -menable-experimental-extensions \
+// RUN: -march=rv32izicfiss0p4 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZICFISS-EXT %s
+// RUN: %clang -target riscv64 -menable-experimental-extensions \
+// RUN: -march=rv64izicfiss0p4 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZICFISS-EXT %s
+// CHECK-ZICFISS-EXT: __riscv_zicfiss 4000{{$}}
diff --git a/llvm/docs/RISCVUsage.rst b/llvm/docs/RISCVUsage.rst
index 842ebf4530595..6bb00c096fde3 100644
--- a/llvm/docs/RISCVUsage.rst
+++ b/llvm/docs/RISCVUsage.rst
@@ -196,7 +196,7 @@ The primary goal of experimental support is to assist in the process of ratifica
``experimental-zfbfmin``, ``experimental-zvfbfmin``, ``experimental-zvfbfwma``
LLVM implements assembler support for the `0.8.0 draft specification <https://github.com/riscv/riscv-bfloat16/releases/tag/20230629>`_.
-``experimental-zicfilp``
+``experimental-zicfilp``, ``experimental-zicfiss``
LLVM implements the `0.4 draft specification <https://github.com/riscv/riscv-cfi/releases/tag/v0.4.0>`__.
``experimental-zicond``
diff --git a/llvm/lib/Support/RISCVISAInfo.cpp b/llvm/lib/Support/RISCVISAInfo.cpp
index 85c34dd620630..c8f1047c2fd47 100644
--- a/llvm/lib/Support/RISCVISAInfo.cpp
+++ b/llvm/lib/Support/RISCVISAInfo.cpp
@@ -175,6 +175,8 @@ static const RISCVSupportedExtension SupportedExperimentalExtensions[] = {
{"zfbfmin", RISCVExtensionVersion{0, 8}},
{"zicfilp", RISCVExtensionVersion{0, 4}},
+ {"zicfiss", RISCVExtensionVersion{0, 4}},
+
{"zicond", RISCVExtensionVersion{1, 0}},
{"ztso", RISCVExtensionVersion{0, 1}},
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 53e2b6b4d94ea..8e7ba6a7029c2 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -74,6 +74,17 @@ static DecodeStatus DecodeGPRRegisterClass(MCInst &Inst, uint32_t RegNo,
return MCDisassembler::Success;
}
+static DecodeStatus DecodeGPRX1X5RegisterClass(MCInst &Inst, uint32_t RegNo,
+ uint64_t Address,
+ const MCDisassembler *Decoder) {
+ MCRegister Reg = RISCV::X0 + RegNo;
+ if (Reg != RISCV::X1 && Reg != RISCV::X5)
+ return MCDisassembler::Fail;
+
+ Inst.addOperand(MCOperand::createReg(Reg));
+ return MCDisassembler::Success;
+}
+
static DecodeStatus DecodeFPR16RegisterClass(MCInst &Inst, uint32_t RegNo,
uint64_t Address,
const MCDisassembler *Decoder) {
@@ -359,6 +370,10 @@ static DecodeStatus decodeRegReg(MCInst &Inst, uint32_t Insn, uint64_t Address,
static DecodeStatus decodeZcmpSpimm(MCInst &Inst, unsigned Imm,
uint64_t Address, const void *Decoder);
+static DecodeStatus decodeCSSPushPopchk(MCInst &Inst, uint32_t Insn,
+ uint64_t Address,
+ const MCDisassembler *Decoder);
+
#include "RISCVGenDisassemblerTables.inc"
static DecodeStatus decodeRVCInstrRdRs1ImmZero(MCInst &Inst, uint32_t Insn,
@@ -373,6 +388,16 @@ static DecodeStatus decodeRVCInstrRdRs1ImmZero(MCInst &Inst, uint32_t Insn,
return MCDisassembler::Success;
}
+static DecodeStatus decodeCSSPushPopchk(MCInst &Inst, uint32_t Insn,
+ uint64_t Address,
+ const MCDisassembler *Decoder) {
+ uint32_t Rs1 = fieldFromInstruction(Insn, 7, 5);
+ DecodeStatus Result = DecodeGPRX1X5RegisterClass(Inst, Rs1, Address, Decoder);
+ (void)Result;
+ assert(Result == MCDisassembler::Success && "Invalid register");
+ return MCDisassembler::Success;
+}
+
static DecodeStatus decodeRVCInstrRdSImm(MCInst &Inst, uint32_t Insn,
uint64_t Address,
const MCDisassembler *Decoder) {
diff --git a/llvm/lib/Target/RISCV/RISCVFeatures.td b/llvm/lib/Target/RISCV/RISCVFeatures.td
index 294927aecb94b..af33e8dffb909 100644
--- a/llvm/lib/Target/RISCV/RISCVFeatures.td
+++ b/llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -79,6 +79,13 @@ def HasStdExtZihintntl : Predicate<"Subtarget->hasStdExtZihintntl()">,
AssemblerPredicate<(all_of FeatureStdExtZihintntl),
"'Zihintntl' (Non-Temporal Locality Hints)">;
+def FeatureStdExtZicfiss
+ : SubtargetFeature<"experimental-zicfiss", "HasStdExtZicfiss", "true",
+ "'Zicfiss' (Shadow stack)">;
+def HasStdExtZicfiss : Predicate<"Subtarget->hasStdExtZicfiss()">,
+ AssemblerPredicate<(all_of FeatureStdExtZicfiss),
+ "'Zicfiss' (Shadow stack)">;
+
def FeatureStdExtZifencei
: SubtargetFeature<"zifencei", "HasStdExtZifencei", "true",
"'Zifencei' (fence.i)">;
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
index edc08187d8f77..cd416699d0fac 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -2111,14 +2111,15 @@ include "RISCVInstrInfoZk.td"
include "RISCVInstrInfoV.td"
include "RISCVInstrInfoZvk.td"
-// Integer
-include "RISCVInstrInfoZicbo.td"
-include "RISCVInstrInfoZicond.td"
-
// Compressed
include "RISCVInstrInfoC.td"
include "RISCVInstrInfoZc.td"
+// Integer
+include "RISCVInstrInfoZicbo.td"
+include "RISCVInstrInfoZicond.td"
+include "RISCVInstrInfoZicfiss.td"
+
//===----------------------------------------------------------------------===//
// Vendor extensions
//===----------------------------------------------------------------------===//
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td b/llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
new file mode 100644
index 0000000000000..631f36624bd8f
--- /dev/null
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
@@ -0,0 +1,71 @@
+//===------ RISCVInstrInfoZicfiss.td - RISC-V Zicfiss -*- tablegen -*------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Instruction class templates
+//===----------------------------------------------------------------------===//
+
+class RVC_SSInst<bits<5> rs1val, RegisterClass reg_class, string opcodestr> :
+ RVInst16<(outs), (ins reg_class:$rs1), opcodestr, "$rs1", [], InstFormatOther> {
+ let Inst{15-13} = 0b011;
+ let Inst{12} = 0;
+ let Inst{11-7} = rs1val;
+ let Inst{6-2} = 0b00000;
+ let Inst{1-0} = 0b01;
+ let DecoderMethod = "decodeCSSPushPopchk";
+}
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasStdExtZicfiss] in {
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
+def SSPOPCHK : RVInstI<0b100, OPC_SYSTEM, (outs), (ins GPRX1X5:$rs1), "sspopchk",
+ "$rs1"> {
+ let rd = 0;
+ let imm12 = 0b110011011100;
+} // Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 1, mayStore = 0
+
+let Uses = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 0 in {
+def SSRDP : RVInstI<0b100, OPC_SYSTEM, (outs GPRNoX0:$rd), (ins), "ssrdp", "$rd"> {
+ let imm12 = 0b110011011100;
+ let rs1 = 0b00000;
+}
+} // Uses = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 0
+
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def SSPUSH : RVInstR<0b1100111, 0b100, OPC_SYSTEM, (outs), (ins GPRX1X5:$rs2),
+ "sspush", "$rs2"> {
+ let rd = 0b00000;
+ let rs1 = 0b00000;
+}
+} // Predicates = [HasStdExtZicfiss]
+
+let Predicates = [HasStdExtZicfiss, HasStdExtCOrZca] in {
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def C_SSPUSH : RVC_SSInst<0b00001, GPRX1, "c.sspush">;
+
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
+def C_SSPOPCHK : RVC_SSInst<0b00101, GPRX5, "c.sspopchk">;
+} // Predicates = [HasStdExtZicfiss, HasStdExtCOrZca]
+
+let Predicates = [HasStdExtZicfiss] in
+defm SSAMOSWAP_W : AMO_rr_aq_rl<0b01001, 0b010, "ssamoswap.w">;
+
+let Predicates = [HasStdExtZicfiss, IsRV64] in
+defm SSAMOSWAP_D : AMO_rr_aq_rl<0b01001, 0b011, "ssamoswap.d">;
+
+//===----------------------------------------------------------------------===/
+// Compress Instruction tablegen backend.
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasStdExtZicfiss, HasStdExtCOrZca] in {
+def : CompressPat<(SSPUSH X1), (C_SSPUSH X1)>;
+def : CompressPat<(SSPOPCHK X5), (C_SSPOPCHK X5)>;
+} // Predicates = [HasStdExtZicfiss, HasStdExtCOrZca]
diff --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
index a3c19115bd317..24f8d600f1eaf 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
@@ -127,6 +127,9 @@ BitVector RISCVRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
markSuperRegs(Reserved, RISCV::X27);
}
+ // Shadow stack pointer.
+ markSuperRegs(Reserved, RISCV::SSP);
+
assert(checkAllSuperRegsMarked(Reserved));
return Reserved;
}
diff --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.td b/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
index c59c9b294d793..4bd3e420debae 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.td
@@ -137,6 +137,8 @@ def GPR : GPRRegisterClass<(add (sequence "X%u", 10, 17),
(sequence "X%u", 0, 4))>;
def GPRX0 : GPRRegisterClass<(add X0)>;
+def GPRX1 : GPRRegisterClass<(add X1)>;
+def GPRX5 : GPRRegisterClass<(add X5)>;
def GPRNoX0 : GPRRegisterClass<(sub GPR, X0)>;
@@ -165,6 +167,10 @@ def SP : GPRRegisterClass<(add X2)>;
def SR07 : GPRRegisterClass<(add (sequence "X%u", 8, 9),
(sequence "X%u", 18, 23))>;
+def GPRX1X5 : RegisterClass<"RISCV", [XLenVT], 32, (add X1, X5)> {
+ let RegInfos = XLenRI;
+}
+
// Floating point registers
let RegAltNameIndices = [ABIRegAltName] in {
def F0_H : RISCVReg16<0, "f0", ["ft0"]>, DwarfRegNum<[32]>;
@@ -591,3 +597,6 @@ foreach m = LMULList in {
// Special registers
def FFLAGS : RISCVReg<0, "fflags">;
def FRM : RISCVReg<0, "frm">;
+
+// Shadow Stack register
+def SSP : RISCVReg<0, "ssp">;
diff --git a/llvm/test/MC/RISCV/attribute-arch.s b/llvm/test/MC/RISCV/attribute-arch.s
index 3ed48401e43fc..c10335e783ff1 100644
--- a/llvm/test/MC/RISCV/attribute-arch.s
+++ b/llvm/test/MC/RISCV/attribute-arch.s
@@ -311,3 +311,6 @@
.attribute arch, "rv32i_zicfilp0p4"
# CHECK: attribute 5, "rv32i2p1_zicfilp0p4"
+
+.attribute arch, "rv32i_zicfiss0p4"
+# CHECK: .attribute 5, "rv32i2p1_zicfiss0p4"
diff --git a/llvm/test/MC/RISCV/compressed-zicfiss.s b/llvm/test/MC/RISCV/compressed-zicfiss.s
new file mode 100644
index 0000000000000..54893555256d1
--- /dev/null
+++ b/llvm/test/MC/RISCV/compressed-zicfiss.s
@@ -0,0 +1,53 @@
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-zicfiss,+c < %s \
+# RUN: | llvm-objdump --mattr=+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zicfiss,+c < %s \
+# RUN: | llvm-objdump --mattr=+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+#
+# RUN: not llvm-mc -triple riscv32 -riscv-no-aliases -show-encoding < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+# CHECK-ASM-AND-OBJ: c.sspopchk t0
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk x5
+
+# CHECK-ASM-AND-OBJ: c.sspopchk t0
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk t0
+
+# CHECK-ASM-AND-OBJ: c.sspush ra
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush x1
+
+# CHECK-ASM-AND-OBJ: c.sspush ra
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush ra
+
+# CHECK-ASM-AND-OBJ: c.sspush ra
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions) or 'Zca' (part of the C extension, excluding compressed floating point loads/stores), 'Zicfiss' (Shadow stack)
+c.sspush x1
+
+# CHECK-ASM-AND-OBJ: c.sspush ra
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions) or 'Zca' (part of the C extension, excluding compressed floating point loads/stores), 'Zicfiss' (Shadow stack)
+c.sspush ra
+
+# CHECK-ASM-AND-OBJ: c.sspopchk t0
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions) or 'Zca' (part of the C extension, excluding compressed floating point loads/stores), 'Zicfiss' (Shadow stack)
+c.sspopchk x5
+
+# CHECK-ASM-AND-OBJ: c.sspopchk t0
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions) or 'Zca' (part of the C extension, excluding compressed floating point loads/stores), 'Zicfiss' (Shadow stack)
+c.sspopchk t0
diff --git a/llvm/test/MC/RISCV/rv32zicfiss-invalid.s b/llvm/test/MC/RISCV/rv32zicfiss-invalid.s
new file mode 100644
index 0000000000000..1cedcb97e2e7f
--- /dev/null
+++ b/llvm/test/MC/RISCV/rv32zicfiss-invalid.s
@@ -0,0 +1,17 @@
+# RUN: not llvm-mc %s -triple=riscv32 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: 2>&1 | FileCheck -check-prefixes=CHECK-ERR %s
+
+# CHECK-ERR: error: invalid operand for instruction
+sspopchk a1
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspush t0
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspopchk ra
+
+# CHECK-ERR: error: invalid operand for instruction
+sspush a0
+
+# CHECK-ERR: error: invalid operand for instruction
+ssrdp zero
diff --git a/llvm/test/MC/RISCV/rv64zicfiss-invalid.s b/llvm/test/MC/RISCV/rv64zicfiss-invalid.s
new file mode 100644
index 0000000000000..1296940455e85
--- /dev/null
+++ b/llvm/test/MC/RISCV/rv64zicfiss-invalid.s
@@ -0,0 +1,17 @@
+# RUN: not llvm-mc %s -triple=riscv64 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: 2>&1 | FileCheck -check-prefixes=CHECK-ERR %s
+
+# CHECK-ERR: error: invalid operand for instruction
+sspopchk a1
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspush t0
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspopchk ra
+
+# CHECK-ERR: error: invalid operand for instruction
+sspush a0
+
+# CHECK-ERR: error: invalid operand for instruction
+ssrdp zero
diff --git a/llvm/test/MC/RISCV/zicfiss-valid.s b/llvm/test/MC/RISCV/zicfiss-valid.s
new file mode 100644
index 0000000000000..fd69d37d7cfa0
--- /dev/null
+++ b/llvm/test/MC/RISCV/zicfiss-valid.s
@@ -0,0 +1,102 @@
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+a,+experimental-zicfiss -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+a,+experimental-zicfiss < %s \
+# RUN: | llvm-objdump --mattr=+a,+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc %s -triple=riscv64 -defsym=RV64=1 -mattr=+a,+experimental-zicfiss -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM-RV64,CHECK-ASM,CHECK-ASM-AND-OBJ-RV64,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -defsym=RV64=1 -mattr=+a,+experimental-zicfiss < %s \
+# RUN: | llvm-objdump --mattr=+a,+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefixes=CHECK-ASM-AND-OBJ-RV64,CHECK-ASM-AND-OBJ %s
+#
+# RUN: not llvm-mc -triple riscv32 -riscv-no-aliases -show-encoding < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+# RUN: not llvm-mc -triple riscv64 -defsym=RV64=1 -riscv-no-aliases -show-encoding < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK-NO-EXT-RV64 %s
+
+# CHECK-ASM-AND-OBJ: sspopchk ra
+# CHECK-ASM: encoding: [0x73,0xc0,0xc0,0xcd]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk x1
+
+# CHECK-ASM-AND-OBJ: sspopchk ra
+# CHECK-ASM: encoding: [0x73,0xc0,0xc0,0xcd]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk ra
+
+# CHECK-ASM-AND-OBJ: sspopchk t0
+# CHECK-ASM: encoding: [0x73,0xc0,0xc2,0xcd]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk x5
+
+# CHECK-ASM-AND-OBJ: sspopchk t0
+# CHECK-ASM: encoding: [0x73,0xc0,0xc2,0xcd]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk t0
+
+# CHECK-ASM-AND-OBJ: sspush ra
+# CHECK-ASM: encoding: [0x73,0x40,0x10,0xce]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush x1
+
+# CHECK-ASM-AND-OBJ: sspush ra
+# CHECK-ASM: encoding: [0x73,0x40,0x10,0xce]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush ra
+
+# check-asm-and-obj: sspush t0
+# check-asm: encoding: [0x73,0x40,0x50,0xce]
+# check-no-ext: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush x5
+
+# check-asm-and-obj: sspush t0
+# check-asm: encoding: [0x73,0x40,0x50,0xce]
+# check-no-ext: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush t0
+
+# CHECK-ASM-AND-OBJ: ssrdp ra
+# CHECK-ASM: encoding: [0xf3,0x40,0xc0,0xcd]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssrdp ra
+
+# CHECK-ASM-AND-OBJ: ssamoswap.w a4, ra, (s0)
+# CHECK-ASM: encoding: [0x2f,0x27,0x14,0x48]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.w a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ: ssamoswap.w.aq a4, ra, (s0)
+# CHECK-ASM: encoding: [0x2f,0x27,0x14,0x4c]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.w.aq a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ: ssamoswap.w.rl a4, ra, (s0)
+# CHECK-ASM: encoding: [0x2f,0x27,0x14,0x4a]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.w.rl a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ: ssamoswap.w.aqrl a4, ra, (s0)
+# CHECK-ASM: encoding: [0x2f,0x27,0x14,0x4e]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.w.aqrl a4, ra, (s0)
+
+.ifdef RV64
+# CHECK-ASM-AND-OBJ-RV64: ssamoswap.d a4, ra, (s0)
+# CHECK-ASM-RV64: encoding: [0x2f,0x37,0x14,0x48]
+# CHECK-NO-EXT-RV64: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.d a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ-RV64: ssamoswap.d.aq a4, ra, (s0)
+# CHECK-ASM-RV64: encoding: [0x2f,0x37,0x14,0x4c]
+# CHECK-NO-EXT-RV64: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.d.aq a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ-RV64: ssamoswap.d.rl a4, ra, (s0)
+# CHECK-ASM-RV64: encoding: [0x2f,0x37,0x14,0x4a]
+# CHECK-NO-EXT-RV64: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.d.rl a4, ra, (s0)
+
+# CHECK-ASM-AND-OBJ-RV64: ssamoswap.d.aqrl a4, ra, (s0)
+# CHECK-ASM-RV64: encoding: [0x2f,0x37,0x14,0x4e]
+# CHECK-NO-EXT-RV64: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap.d.aqrl a4, ra, (s0)
+.endif
diff --git a/llvm/unittests/Support/RISCVISAInfoTest.cpp b/llvm/unittests/Support/RISCVISAInfoTest.cpp
index 3de14907899eb..b33452592da3d 100644
--- a/llvm/unittests/Support/RISCVISAInfoTest.cpp
+++ b/llvm/unittests/Support/RISCVISAInfoTest.cpp
@@ -737,6 +737,7 @@ R"(All available -march extensions for RISC-V
Experimental extensions
zicfilp 0.4 This is a long dummy description
+ zicfiss 0.4
zicond 1.0
zacas 1.0
zfbfmin 0.8
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