6738cfe0a4
The CXX module initializer function, which is called at program startup, needs to be tagged with Pointer Authentication and Branch Target Identification marks whenever relevant. Before this patch, in CPUs set up for PACBTI execution, the function wasn't protected with return address signing and no BTI instruction was inserted at the start of it, thus leading to an execution fault. This patch fixes the issue by marking the function with the function attributes related to PAC and BTI if relevant.
18 lines
1.3 KiB
C++
18 lines
1.3 KiB
C++
// RUN: %clang_cc1 -triple thumbv8.1m.main-unknown-none-eabi -emit-module-interface -target-feature +pacbti -msign-return-address=all -mbranch-target-enforce -std=c++20 %s -o %t.pcm
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// RUN: %clang_cc1 -triple thumbv8.1m.main-unknown-none-eabi -std=c++20 %t.pcm -emit-llvm -o - | \
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// RUN: FileCheck --check-prefixes=CHECK,CHECK-PAC-ARM %s
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// RUN: %clang_cc1 -triple aarch64-unknown-none-elf -emit-module-interface -target-feature +pacbti -msign-return-address=all -msign-return-address-key=b_key -mbranch-target-enforce -std=c++20 %s -o %t.pcm
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// RUN: %clang_cc1 -triple aarch64-unknown-none-elf -std=c++20 %t.pcm -emit-llvm -o - | \
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// RUN: FileCheck --check-prefixes=CHECK,CHECK-PAC-AARCH64 %s
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// CHECK: define void @_ZGIW3foo() #0
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// CHECK-PAC-ARM: attributes #0 = { noinline nounwind "branch-target-enforcement" "no-trapping-math"="true" "sign-return-address"="all" "sign-return-address-key"="a_key" "stack-protector-buffer-size"="8" "target-features"="+armv8.1-m.main,+pacbti,+thumb-mode" }
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// CHECK-PAC-AARCH64: attributes #0 = { noinline nounwind "branch-target-enforcement" "no-trapping-math"="true" "sign-return-address"="all" "sign-return-address-key"="b_key" "stack-protector-buffer-size"="8" "target-features"="+pacbti" }
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module;
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export module foo;
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export void func();
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