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llvm-project/clang/test/CodeGen/arm-branch-protection-attr-2.c

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[clang][ARM] PACBTI-M frontend support Handle branch protection option on the commandline as well as a function attribute. One patch for both mechanisms, as they use the same underlying parsing mechanism. These are recorded in a set of LLVM IR module-level attributes like we do for AArch64 PAC/BTI (see https://reviews.llvm.org/D85649): - command-line options are "translated" to module-level LLVM IR attributes (metadata). - functions have PAC/BTI specific attributes iff the __attribute__((target("branch-protection=...))) was used in the function declaration. - command-line option -mbranch-protection to armclang targeting Arm, following this grammar: branch-protection ::= "-mbranch-protection=" <protection> protection ::= "none" | "standard" | "bti" [ "+" <pac-ret-clause> ] | <pac-ret-clause> [ "+" "bti"] pac-ret-clause ::= "pac-ret" [ "+" <pac-ret-option> ] pac-ret-option ::= "leaf" ["+" "b-key"] | "b-key" ["+" "leaf"] b-key is simply a placeholder to make it consistent with AArch64's version. In Arm, however, it triggers a warning informing that b-key is unsupported and a-key will be selected instead. - Handle _attribute_((target(("branch-protection=..."))) for AArch32 with the same grammer as the commandline options. This patch is part of a series that adds support for the PACBTI-M extension of the Armv8.1-M architecture, as detailed here: https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/armv8-1-m-pointer-authentication-and-branch-target-identification-extension The PACBTI-M specification can be found in the Armv8-M Architecture Reference Manual: https://developer.arm.com/documentation/ddi0553/latest The following people contributed to this patch: - Momchil Velikov - Victor Campos - Ties Stuij Reviewed By: vhscampos Differential Revision: https://reviews.llvm.org/D112421
2021-12-01 18:22:19 +08:00
// REQUIRES: arm-registered-target
// RUN: %clang -target arm-arm-none-eabi -march=armv7-m -S -emit-llvm -o - -mbranch-protection=none %s | FileCheck %s --check-prefix=CHECK --check-prefix=NONE
// RUN: %clang -target arm-arm-none-eabi -march=armv7-m -S -emit-llvm -o - -mbranch-protection=pac-ret %s | FileCheck %s --check-prefix=CHECK --check-prefix=PART
// RUN: %clang -target arm-arm-none-eabi -march=armv7-m -S -emit-llvm -o - -mbranch-protection=pac-ret+leaf %s | FileCheck %s --check-prefix=CHECK --check-prefix=ALL
// RUN: %clang -target arm-arm-none-eabi -march=armv7-m -S -emit-llvm -o - -mbranch-protection=pac-ret+b-key %s | FileCheck %s --check-prefix=CHECK --check-prefix=PART
// RUN: %clang -target arm-arm-none-eabi -march=armv7-m -S -emit-llvm -o - -mbranch-protection=bti %s | FileCheck %s --check-prefix=CHECK --check-prefix=BTE
// Check there are no branch protection function attributes
// CHECK-LABEL: @foo() #[[#ATTR:]]
// CHECK-NOT: attributes #[[#ATTR]] = { {{.*}} "sign-return-address"
// CHECK-NOT: attributes #[[#ATTR]] = { {{.*}} "sign-return-address-key"
// CHECK-NOT: attributes #[[#ATTR]] = { {{.*}} "branch-target-enforcement"
// Check module attributes
// NONE: !{i32 1, !"branch-target-enforcement", i32 0}
// PART: !{i32 1, !"branch-target-enforcement", i32 0}
// ALL: !{i32 1, !"branch-target-enforcement", i32 0}
// BTE: !{i32 1, !"branch-target-enforcement", i32 1}
// NONE: !{i32 1, !"sign-return-address", i32 0}
// PART: !{i32 1, !"sign-return-address", i32 1}
// ALL: !{i32 1, !"sign-return-address", i32 1}
// BTE: !{i32 1, !"sign-return-address", i32 0}
// NONE: !{i32 1, !"sign-return-address-all", i32 0}
// PART: !{i32 1, !"sign-return-address-all", i32 0}
// ALL: !{i32 1, !"sign-return-address-all", i32 1}
// BTE: !{i32 1, !"sign-return-address-all", i32 0}
void foo() {}