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llvm-project/clang/test/CodeGen/stack-protector-guard.c
Ard Biesheuvel 9a1ebae029 [AARCH64] Support TPIDR_EL0 and TPIDRRO_EL0 as stack protector sysregs (#188054) 
Even though the command line option suggests that arbitrary system
registers may be chosen, the sysreg option for the stack protector guard
currently only permits SP_EL0, as this is what the Linux kernel uses.

While it makes no sense to permit arbitrary system registers here (which
usually have side effects), there is a desire to switch to TPIDR_EL0 or
TPIDRRO_EL0 from the Linux side, both of which are part of the base v8.0
AArch64 ISA, and can hold arbitrary 64-bit values without side effects.

So add TPIDR_EL0 and TPIDRRO_EL0 to the set of accepted arguments for
the -mstack-protected-guard-reg= command line option. For good measure,
add TPIDR_EL1, TPIDR_EL2, FAR_EL1 and FAR_EL2 as well, all of which
could potentially be useful to privileged software such as the Linux
kernel to stash a per-thread pointer to the stack protector guard value.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
2026-03-25 08:57:12 -07:00

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// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple x86_64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple powerpc64le-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple arm-linux-gnueabi \
// RUN: -mstack-protector-guard-offset=1024 -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple thumbv7-linux-gnueabi \
// RUN: -mstack-protector-guard-offset=1024 -emit-llvm %s -o - | FileCheck %s
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=sp_el0 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-SP
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=tpidrro_el0 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-TPIDRRO
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=tpidr_el0 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-TPIDR-EL0
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=tpidr_el1 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-TPIDR-EL1
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=tpidr_el2 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-TPIDR-EL2
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=far_el1 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-FAR-EL1
// RUN: %clang_cc1 -mstack-protector-guard=sysreg -triple aarch64-linux-gnu \
// RUN: -mstack-protector-guard-offset=1024 -mstack-protector-guard-reg=far_el2 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=AARCH64 --check-prefix=AARCH64-FAR-EL2
// RUN: %clang_cc1 -mstack-protector-guard=tls -triple riscv64-unknown-elf \
// RUN: -mstack-protector-guard-offset=44 -mstack-protector-guard-reg=tp \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=RISCV
// RUN: %clang_cc1 -mstack-protector-guard=tls -triple powerpc64-unknown-elf \
// RUN: -mstack-protector-guard-offset=52 -mstack-protector-guard-reg=r13 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=POWERPC64
// RUN: %clang_cc1 -mstack-protector-guard=tls -triple ppc32-unknown-elf \
// RUN: -mstack-protector-guard-offset=16 -mstack-protector-guard-reg=r2 \
// RUN: -emit-llvm %s -o - | FileCheck %s --check-prefix=POWERPC32
void foo(int*);
void bar(int x) {
int baz[x];
foo(baz);
}
// CHECK: !llvm.module.flags = !{{{.*}}[[ATTR1:![0-9]+]], [[ATTR2:![0-9]+]]}
// CHECK: [[ATTR1]] = !{i32 1, !"stack-protector-guard", !"sysreg"}
// CHECK: [[ATTR2]] = !{i32 1, !"stack-protector-guard-offset", i32 1024}
// AARCH64: !llvm.module.flags = !{{{.*}}[[ATTR1:![0-9]+]], [[ATTR2:![0-9]+]], [[ATTR3:![0-9]+]]}
// AARCH64: [[ATTR1]] = !{i32 1, !"stack-protector-guard", !"sysreg"}
// AARCH64-SP: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"sp_el0"}
// AARCH64-TPIDRRO: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"tpidrro_el0"}
// AARCH64-TPIDR-EL0: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"tpidr_el0"}
// AARCH64-TPIDR-EL1: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"tpidr_el1"}
// AARCH64-TPIDR-EL2: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"tpidr_el2"}
// AARCH64-FAR-EL1: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"far_el1"}
// AARCH64-FAR-EL2: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"far_el2"}
// AARCH64: [[ATTR3]] = !{i32 1, !"stack-protector-guard-offset", i32 1024}
// RISCV: !llvm.module.flags = !{{{.*}}[[ATTR1:![0-9]+]], [[ATTR2:![0-9]+]], [[ATTR3:![0-9]+]], [[ATTR4:![0-9]+]]}
// RISCV: [[ATTR1]] = !{i32 1, !"stack-protector-guard", !"tls"}
// RISCV: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"tp"}
// RISCV: [[ATTR3]] = !{i32 1, !"stack-protector-guard-offset", i32 44}
// POWERPC64: !llvm.module.flags = !{[[ATTR1:![0-9]+]], [[ATTR2:![0-9]+]], [[ATTR3:![0-9]+]]}
// POWERPC64: [[ATTR1]] = !{i32 1, !"stack-protector-guard", !"tls"}
// POWERPC64: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"r13"}
// POWERPC64: [[ATTR3]] = !{i32 1, !"stack-protector-guard-offset", i32 52}
// POWERPC32: !llvm.module.flags = !{[[ATTR1:![0-9]+]], [[ATTR2:![0-9]+]], [[ATTR3:![0-9]+]]}
// POWERPC32: [[ATTR1]] = !{i32 1, !"stack-protector-guard", !"tls"}
// POWERPC32: [[ATTR2]] = !{i32 1, !"stack-protector-guard-reg", !"r2"}
// POWERPC32: [[ATTR3]] = !{i32 1, !"stack-protector-guard-offset", i32 16}
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