!106 Support stack clash protection
From: @wcleungaj Reviewed-by: @cf-zhao Signed-off-by: @cf-zhao
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@ -0,0 +1,99 @@
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From da192e499e442fc433ef8ab2290cf0021e214c85 Mon Sep 17 00:00:00 2001
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From: Momchil Velikov <momchil.velikov@arm.com>
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Date: Thu, 30 Nov 2023 11:18:02 +0000
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Subject: [PATCH 2/7] [clang][AArch64] Pass down stack clash protection options
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to LLVM/Backend (#68993)
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---
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clang/lib/CodeGen/CodeGenModule.cpp | 13 +++++++++++++
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clang/lib/Driver/ToolChains/Clang.cpp | 2 +-
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clang/test/CodeGen/stack-clash-protection.c | 18 +++++++++++-------
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3 files changed, 25 insertions(+), 8 deletions(-)
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diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
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index f09d1129b128..eabc4aabea06 100644
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--- a/clang/lib/CodeGen/CodeGenModule.cpp
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+++ b/clang/lib/CodeGen/CodeGenModule.cpp
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@@ -1067,6 +1067,15 @@ void CodeGenModule::Release() {
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"sign-return-address-with-bkey", 1);
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}
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+ if (CodeGenOpts.StackClashProtector)
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+ getModule().addModuleFlag(
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+ llvm::Module::Override, "probe-stack",
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+ llvm::MDString::get(TheModule.getContext(), "inline-asm"));
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+
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+ if (CodeGenOpts.StackProbeSize && CodeGenOpts.StackProbeSize != 4096)
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+ getModule().addModuleFlag(llvm::Module::Min, "stack-probe-size",
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+ CodeGenOpts.StackProbeSize);
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+
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if (!CodeGenOpts.MemoryProfileOutput.empty()) {
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llvm::LLVMContext &Ctx = TheModule.getContext();
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getModule().addModuleFlag(
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@@ -2261,6 +2270,10 @@ void CodeGenModule::SetLLVMFunctionAttributesForDefinition(const Decl *D,
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if (CodeGenOpts.StackClashProtector)
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B.addAttribute("probe-stack", "inline-asm");
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+ if (CodeGenOpts.StackProbeSize && CodeGenOpts.StackProbeSize != 4096)
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+ B.addAttribute("stack-probe-size",
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+ std::to_string(CodeGenOpts.StackProbeSize));
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+
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if (!hasUnwindExceptions(LangOpts))
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B.addAttribute(llvm::Attribute::NoUnwind);
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diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
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index 6b5930990f11..25627c72f858 100644
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--- a/clang/lib/Driver/ToolChains/Clang.cpp
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+++ b/clang/lib/Driver/ToolChains/Clang.cpp
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@@ -3473,7 +3473,7 @@ static void RenderSCPOptions(const ToolChain &TC, const ArgList &Args,
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return;
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if (!EffectiveTriple.isX86() && !EffectiveTriple.isSystemZ() &&
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- !EffectiveTriple.isPPC64())
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+ !EffectiveTriple.isPPC64() && !EffectiveTriple.isAArch64())
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return;
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Args.addOptInFlag(CmdArgs, options::OPT_fstack_clash_protection,
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diff --git a/clang/test/CodeGen/stack-clash-protection.c b/clang/test/CodeGen/stack-clash-protection.c
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index 67571f5cdb2c..dab9ee768c28 100644
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--- a/clang/test/CodeGen/stack-clash-protection.c
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+++ b/clang/test/CodeGen/stack-clash-protection.c
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@@ -1,8 +1,9 @@
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// Check the correct function attributes are generated
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-// RUN: %clang_cc1 -triple x86_64-linux -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
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-// RUN: %clang_cc1 -triple s390x-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
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-// RUN: %clang_cc1 -triple powerpc64le-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
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-// RUN: %clang_cc1 -triple powerpc64-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection | FileCheck %s
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+// RUN: %clang_cc1 -triple x86_64-linux -O0 -S -emit-llvm -o- %s -fstack-clash-protection -mstack-probe-size=8192 | FileCheck %s
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+// RUN: %clang_cc1 -triple s390x-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection -mstack-probe-size=8192 | FileCheck %s
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+// RUN: %clang_cc1 -triple powerpc64le-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection -mstack-probe-size=8192 | FileCheck %s
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+// RUN: %clang_cc1 -triple powerpc64-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection -mstack-probe-size=8192 | FileCheck %s
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+// RUN: %clang_cc1 -triple aarch64-linux-gnu -O0 -S -emit-llvm -o- %s -fstack-clash-protection -mstack-probe-size=8192 | FileCheck %s
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// CHECK: define{{.*}} void @large_stack() #[[A:.*]] {
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void large_stack(void) {
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@@ -11,15 +12,18 @@ void large_stack(void) {
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stack[i] = i;
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}
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-// CHECK: define{{.*}} void @vla({{.*}}) #[[A:.*]] {
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+// CHECK: define{{.*}} void @vla({{.*}}) #[[A]] {
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void vla(int n) {
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volatile int vla[n];
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__builtin_memset(&vla[0], 0, 1);
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}
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-// CHECK: define{{.*}} void @builtin_alloca({{.*}}) #[[A:.*]] {
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+// CHECK: define{{.*}} void @builtin_alloca({{.*}}) #[[A]] {
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void builtin_alloca(int n) {
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volatile void *mem = __builtin_alloca(n);
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}
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-// CHECK: attributes #[[A]] = {{.*}} "probe-stack"="inline-asm"
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+// CHECK: attributes #[[A]] = {{.*}}"probe-stack"="inline-asm" {{.*}}"stack-probe-size"="8192"
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+
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+// CHECK: !{i32 4, !"probe-stack", !"inline-asm"}
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+// CHECK: !{i32 8, !"stack-probe-size", i32 8192}
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--
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2.42.0.windows.2
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@ -37,7 +37,7 @@
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Name: %{pkg_name}
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Version: %{clang_version}
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Release: 16
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Release: 17
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Summary: A C language family front-end for LLVM
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License: NCSA
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@ -60,6 +60,7 @@ Patch11: 0011-Add-the-support-for-classic-flang.patch
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Patch12: 0012-Fix-declaration-definition-mismatch-for-classic-flang.patch
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Patch13: 0013-Ignored-option-Wa-generate-missing-build-notes.patch
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Patch14: 0014-Update-llvm-lit-config-to-support-build_for_openeule.patch
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Patch15: 0015-Backport-clang-AArch64-Pass-down-stack-clash-protection-options-to-LLVM-Backend.patch
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# Patches for clang-tools-extra
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# See https://reviews.llvm.org/D120301
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@ -394,6 +395,9 @@ LD_LIBRARY_PATH=%{buildroot}/%{install_libdir} %{__ninja} check-all -C ./_build
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%{install_bindir}/git-clang-format
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%changelog
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* Fri May 10 2024 rickyleung <leung.wing.chung@huawei.com> - 17.0.6-17
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- Backport the patch to support stack clash protection
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* Mon Apr 29 2024 wangqiang <wangqiang1@kylinos.cn> - 17.0.6-16
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- Ignored the `-Wa,--generate-missing-build-notes=` option, update llvm-lit config to support macro `build_for_openeuler`
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