ba9caf9170
According to the ABI for the Arm Architecture, the value for the
Tag_also_compatible_with eabi attribute is represented by an NTBS entry.
This string value, in turn, is composed of a pair of tag+value encoded
in one of two formats:
- ULEB128: tag, ULEB128: value, 0.
- ULEB128: tag, NBTS: data.
(See [[ 60a8eb8c55/addenda32/addenda32.rst (3373secondary-compatibility-tag) | section 3.3.7.3 on the Addenda to, and Errata in, the ABI for the Arm Architecture ]].)
Currently the Arm assembly parser and streamer ignore the encoding of
the attribute's NTBS value, which can result in incorrect attributes
being emitted in both assembly and object file outputs.
This patch fixes these issues by properly handing the value's encoding.
An update to llvm-readobj to properly handle the attribute's value will be
covered by a separate patch.
Patch by Victor Campos and Lucas Prates.
Reviewed By: vhscampos
Differential Revision: https://reviews.llvm.org/D129500
105 lines
2.4 KiB
ArmAsm
105 lines
2.4 KiB
ArmAsm
// This tests that ARM attributes are properly encoded.
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// RUN: llvm-mc < %s -triple=arm-linux-gnueabi -filetype=obj -o - \
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// RUN: | llvm-readobj -S --sd - | FileCheck %s
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// Tag_CPU_name (=5)
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.cpu cortex-a8
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// Tag_CPU_arch (=6)
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.eabi_attribute 6, 10
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// Tag_arch_profile (=7)
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.eabi_attribute 7, 'A'
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// Tag_ARM_ISA_use (=8)
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.eabi_attribute 8, 1
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// Tag_THUMB_ISA_use (=9)
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.eabi_attribute 9, 2
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// Tag_FP_arch (=10)
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.fpu vfpv3
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// Tag_Advanced_SIMD_arch (=12)
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.eabi_attribute 12, 2
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// Tag_ABI_FP_denormal (=20)
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.eabi_attribute 20, 1
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// Tag_ABI_FP_exceptions (=21)
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.eabi_attribute 21, 1
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// Tag_ABI_FP_number_model (=23)
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.eabi_attribute 23, 1
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// Tag_ABI_align_needed (=24)
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.eabi_attribute 24, 1
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// Tag_ABI_align_preserved (=25)
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.eabi_attribute 25, 1
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// Tag_ABI_HardFP_use (=27)
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.eabi_attribute 27, 0
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// Tag_ABI_VFP_args (=28)
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.eabi_attribute 28, 1
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// Tag_FP_HP_extension (=36)
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.eabi_attribute 36, 1
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// Tag_MPextension_use (=42)
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.eabi_attribute 42, 1
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// Tag_DIV_use (=44)
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.eabi_attribute 44, 2
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// Tag_DSP_extension (=46)
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.eabi_attribute 46, 1
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// Tag_PAC_extension (=50)
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.eabi_attribute 50, 0
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// Tag_BTI_extension (=52)
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.eabi_attribute 52, 0
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// Tag_also_compatible_with (=65)
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.eabi_attribute 65, "\006\017"
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// Tag_BTI_use (=74)
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.eabi_attribute 74, 0
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// Tag_PACRET_use (=76)
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.eabi_attribute 76, 0
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// Tag_Virtualization_use (=68)
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.eabi_attribute 68, 3
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// Check that values > 128 are encoded properly
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.eabi_attribute 110, 160
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// Check that tags > 128 are encoded properly
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.eabi_attribute 129, "1"
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.eabi_attribute 250, 1
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// CHECK: Section {
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// CHECK: Name: .ARM.attributes (7)
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// CHECK-NEXT: Type: SHT_ARM_ATTRIBUTES (0x70000003)
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// CHECK-NEXT: Flags [ (0x0)
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// CHECK-NEXT: ]
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// CHECK-NEXT: Address: 0x0
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// CHECK-NEXT: Offset: 0x34
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// CHECK-NEXT: Size: 85
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// CHECK-NEXT: Link: 0
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// CHECK-NEXT: Info: 0
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// CHECK-NEXT: AddressAlignment: 1
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// CHECK-NEXT: EntrySize: 0
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// CHECK-NEXT: SectionData (
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// CHECK-NEXT: 0000: 41540000 00616561 62690001 4A000000 |AT...aeabi..J...|
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// CHECK-NEXT: 0010: 05636F72 7465782D 61380006 0A074108 |.cortex-a8....A.|
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// CHECK-NEXT: 0020: 0109020A 030C0214 01150117 01180119 |................|
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// CHECK-NEXT: 0030: 011B001C 0124012A 012C022E 01320034 |.....$.*.,...2.4|
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// CHECK-NEXT: 0040: 0041060F 0044034A 004C006E A0018101 |.A...D.J.L.n....|
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// CHECK-NEXT: 0050: 3100FA01 01 |1....|
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// CHECK-NEXT: )
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