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llvm-project/llvm/test/CodeGen/AArch64/note-gnu-property-pac-bti-0.ll

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[AArch64] Emit PAC/BTI .note.gnu.property flags This patch make LLVM emit the processor specific program property types defined in AArch64 ELF spec https://developer.arm.com/docs/ihi0056/f/elf-for-the-arm-64-bit-architecture-aarch64-abi-2019q2-documentation A file containing no functions gets both property flags. Otherwise, a property is set iff all the functions in the file have the corresponding attribute. Patch by Daniel Kiss and Momchil Velikov. Differential Revision: https://reviews.llvm.org/D71019
2019-12-14 01:37:22 +08:00
; RUN: llc -mtriple=aarch64-linux %s -o - | \
; RUN: FileCheck %s --check-prefix=ASM
; RUN: llc -mtriple=aarch64-linux %s -filetype=obj -o - | \
[llvm-readobj] Update tests because of changes in llvm-readobj behavior This patch updates tests using llvm-readobj and llvm-readelf, because soon reading from stdin will be achievable only via a '-' as described here: https://bugs.llvm.org/show_bug.cgi?id=46400. Patch with changes to llvm-readobj behavior is here: https://reviews.llvm.org/D83704 Differential Revision: https://reviews.llvm.org/D83912 Reviewed by: jhenderson, MaskRay, grimar
2020-07-20 15:39:14 +08:00
; RUN: llvm-readelf --notes - | FileCheck %s --check-prefix=OBJ
[AArch64] Emit PAC/BTI .note.gnu.property flags This patch make LLVM emit the processor specific program property types defined in AArch64 ELF spec https://developer.arm.com/docs/ihi0056/f/elf-for-the-arm-64-bit-architecture-aarch64-abi-2019q2-documentation A file containing no functions gets both property flags. Otherwise, a property is set iff all the functions in the file have the corresponding attribute. Patch by Daniel Kiss and Momchil Velikov. Differential Revision: https://reviews.llvm.org/D71019
2019-12-14 01:37:22 +08:00
@x = common dso_local global i32 0, align 4
[AArch64] PAC/BTI code generation for LLVM generated functions PAC/BTI-related codegen in the AArch64 backend is controlled by a set of LLVM IR function attributes, added to the function by Clang, based on command-line options and GCC-style function attributes. However, functions, generated in the LLVM middle end (for example, asan.module.ctor or __llvm_gcov_write_out) do not get any attributes and the backend incorrectly does not do any PAC/BTI code generation. This patch record the default state of PAC/BTI codegen in a set of LLVM IR module-level attributes, based on command-line options: * "sign-return-address", with non-zero value means generate code to sign return addresses (PAC-RET), zero value means disable PAC-RET. * "sign-return-address-all", with non-zero value means enable PAC-RET for all functions, zero value means enable PAC-RET only for functions, which spill LR. * "sign-return-address-with-bkey", with non-zero value means use B-key for signing, zero value mean use A-key. This set of attributes are always added for AArch64 targets (as opposed, for example, to interpreting a missing attribute as having a value 0) in order to be able to check for conflicts when combining module attributed during LTO. Module-level attributes are overridden by function level attributes. All the decision making about whether to not to generate PAC and/or BTI code is factored out into AArch64FunctionInfo, there shouldn't be any places left, other than AArch64FunctionInfo, which directly examine PAC/BTI attributes, except AArch64AsmPrinter.cpp, which is/will-be handled by a separate patch. Differential Revision: https://reviews.llvm.org/D85649
2020-09-25 18:45:22 +08:00
attributes #0 = { "branch-target-enforcement"="true" }
[AArch64] Emit PAC/BTI .note.gnu.property flags This patch make LLVM emit the processor specific program property types defined in AArch64 ELF spec https://developer.arm.com/docs/ihi0056/f/elf-for-the-arm-64-bit-architecture-aarch64-abi-2019q2-documentation A file containing no functions gets both property flags. Otherwise, a property is set iff all the functions in the file have the corresponding attribute. Patch by Daniel Kiss and Momchil Velikov. Differential Revision: https://reviews.llvm.org/D71019
2019-12-14 01:37:22 +08:00
[AArch64] Generate .note.gnu.property based on module flags. Flags of the module derived exclusively from the compiler flag `-mbranch-protection`. The note is generated based on the module flags accordingly. After this change in case of compile unit without function won't have the .note.gnu.property if the compiler flag is not present [1]. [1] https://bugs.llvm.org/show_bug.cgi?id=46480 Reviewed By: chill Differential Revision: https://reviews.llvm.org/D80791
2020-09-28 19:57:21 +08:00
!llvm.module.flags = !{!0, !1, !2, !3}
!0 = !{i32 1, !"branch-target-enforcement", i32 1}
!1 = !{i32 1, !"sign-return-address", i32 1}
!2 = !{i32 1, !"sign-return-address-all", i32 0}
!3 = !{i32 1, !"sign-return-address-with-bkey", i32 0}
[AArch64] Emit PAC/BTI .note.gnu.property flags This patch make LLVM emit the processor specific program property types defined in AArch64 ELF spec https://developer.arm.com/docs/ihi0056/f/elf-for-the-arm-64-bit-architecture-aarch64-abi-2019q2-documentation A file containing no functions gets both property flags. Otherwise, a property is set iff all the functions in the file have the corresponding attribute. Patch by Daniel Kiss and Momchil Velikov. Differential Revision: https://reviews.llvm.org/D71019
2019-12-14 01:37:22 +08:00
; Both attributes present in a file with no functions.
; ASM: .word 3221225472
; ASM-NEXT: .word 4
[llvm] Fix missing FileCheck directive colons https://reviews.llvm.org/D77352
2020-04-03 06:28:32 +08:00
; ASM-NEXT: .word 3
[AArch64] Emit PAC/BTI .note.gnu.property flags This patch make LLVM emit the processor specific program property types defined in AArch64 ELF spec https://developer.arm.com/docs/ihi0056/f/elf-for-the-arm-64-bit-architecture-aarch64-abi-2019q2-documentation A file containing no functions gets both property flags. Otherwise, a property is set iff all the functions in the file have the corresponding attribute. Patch by Daniel Kiss and Momchil Velikov. Differential Revision: https://reviews.llvm.org/D71019
2019-12-14 01:37:22 +08:00
; OBJ: Properties: aarch64 feature: BTI, PAC