d52675e0a7
This patch enables lld to read AArch64 Build Attributes and convert them
into GNU Properties.
Changes:
- Parses AArch64 Build Attributes from input object files.
- Converts known attributes into corresponding GNU Properties.
- Merges attributes when linking multiple objects.
Spec reference:
https://github.com/ARM-software/abi-aa/pull/230/files#r1030
Co-authored-by: Sivan Shani <sivan.shani@arm.com>
---------
Co-authored-by: Sivan Shani <sivan.shani@arm.com>
51 lines
2.0 KiB
ArmAsm
51 lines
2.0 KiB
ArmAsm
// REQUIRES: aarch64
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// RUN: rm -rf %t && split-file %s %t && cd %t
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// RUN: llvm-mc -triple=aarch64 -filetype=obj %s -o %t1.o
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// RUN: llvm-mc -triple=aarch64 -filetype=obj pauth-bti-gcs.s -o %t2.o
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// RUN: llvm-mc -triple=aarch64 -filetype=obj pauth-bti-pac.s -o %t3.o
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// RUN: ld.lld -r %t1.o %t2.o %t3.o -o %t.merged.o
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// RUN: llvm-readelf -n %t.merged.o | FileCheck %s --check-prefix=NOTE
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/// This test merges three object files with AArch64 build attributes.
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/// All contain identical PAuth ABI info (platform/version), which must be preserved.
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/// Only BTI is common across all three in the AND feature set, so the merged output
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/// must show BTI only. PAC and GCS are present in subsets and should not appear.
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// NOTE: Displaying notes found in: .note.gnu.property
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// NOTE-NEXT: Owner Data size Description
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// NOTE-NEXT: GNU 0x00000028 NT_GNU_PROPERTY_TYPE_0 (property note)
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// NOTE-NEXT: Properties: aarch64 feature: BTI
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// NOTE-NEXT: AArch64 PAuth ABI core info: platform 0x31 (unknown), version 0x13
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// CHECK: .note.gnu.property
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// CHECK-NOT: .ARM.attributes
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.aeabi_subsection aeabi_pauthabi, required, uleb128
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.aeabi_attribute Tag_PAuth_Platform, 49
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.aeabi_attribute Tag_PAuth_Schema, 19
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.aeabi_subsection aeabi_feature_and_bits, optional, uleb128
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.aeabi_attribute Tag_Feature_BTI, 1
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.aeabi_attribute Tag_Feature_PAC, 1
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.aeabi_attribute Tag_Feature_GCS, 1
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//--- pauth-bti-gcs.s
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.aeabi_subsection aeabi_pauthabi, required, uleb128
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.aeabi_attribute Tag_PAuth_Platform, 49
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.aeabi_attribute Tag_PAuth_Schema, 19
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.aeabi_subsection aeabi_feature_and_bits, optional, uleb128
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.aeabi_attribute Tag_Feature_BTI, 1
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.aeabi_attribute Tag_Feature_PAC, 0
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.aeabi_attribute Tag_Feature_GCS, 1
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//--- pauth-bti-pac.s
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.aeabi_subsection aeabi_pauthabi, required, uleb128
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.aeabi_attribute Tag_PAuth_Platform, 49
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.aeabi_attribute Tag_PAuth_Schema, 19
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.aeabi_subsection aeabi_feature_and_bits, optional, uleb128
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.aeabi_attribute Tag_Feature_BTI, 1
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.aeabi_attribute Tag_Feature_PAC, 1
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.aeabi_attribute Tag_Feature_GCS, 0
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