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52e5ec1f09
Commit 6a2ea84600ba ("BPF: Add more relocation kinds")
added new relocations R_BPF_64_ABS64 and R_BPF_64_ABS32
for normal 64-bit and 32-bit data relocations.
This is to replace some of functionalities with
R_BPF_64_64 and R_BPF_64_32 so that new R_BPF_64_64
and R_BPF_64_32 semantics are for ld_imm64 and
call instructions only.
The BPF support in lib/Object/RelocationResolver.cpp
is used to perform normal data relocations for
the case like DWARFObjInMemory with an object file
(search function getRelocationResolver() in file
DebugInfo/DWARF/DWARFContext.cpp) or llvm-readobj
to dump ".stack_sizes" section data.
In all these casees, normal 64-bit and 32-bit relocations
are performed and such resolution resolution
is exactly what implemented in RelocationResolver.cpp.
But Commit 6a2ea84600ba missed to change
R_BPF_64_64/R_BPF_64_32 to R_BPF_64_ABS64/R_BPF_64_ABS32.
This patch fixed the issue and added a test for it
with llvm-readobj dumping ".stack_sizes" section.
Differential Revision: https://reviews.llvm.org/D103864
87 lines
2.4 KiB
YAML
87 lines
2.4 KiB
YAML
# RUN: yaml2obj %s -o %t
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# RUN: llvm-readobj -r --stack-sizes %t | FileCheck %s
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# CHECK: Relocations [
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# CHECK-NEXT: Section (3) .rel.text {
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# CHECK-NEXT: 0x0 R_BPF_64_64 g
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# CHECK-NEXT: }
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# CHECK-NEXT: Section (5) .rel.stack_sizes {
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# CHECK-NEXT: 0x0 R_BPF_64_ABS64 .text
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK: StackSizes [
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# CHECK-NEXT: Entry {
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# CHECK-NEXT: Function: test
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# CHECK-NEXT: Size: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_BPF
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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AddressAlign: 0x8
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Content: '1801000000000000000000000000000061100000000000009500000000000000'
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- Name: .stack_sizes
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Type: SHT_PROGBITS
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Flags: [ SHF_LINK_ORDER ]
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Link: .text
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AddressAlign: 0x1
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Entries:
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- Size: 0x0
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x4
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Size: 0x4
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- Name: .rel.text
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Type: SHT_REL
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Link: .symtab
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AddressAlign: 0x8
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Info: .text
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Relocations:
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- Symbol: g
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Type: R_BPF_64_64
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- Name: .rel.stack_sizes
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Type: SHT_REL
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Link: .symtab
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AddressAlign: 0x8
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Info: .stack_sizes
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Relocations:
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- Symbol: .text
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Type: R_BPF_64_ABS64
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- Type: SectionHeaderTable
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Sections:
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- Name: .strtab
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- Name: .text
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- Name: .rel.text
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- Name: .stack_sizes
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- Name: .rel.stack_sizes
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- Name: .bss
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- Name: .symtab
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- Name: .shstrtab
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Symbols:
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- Name: t.c
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Type: STT_FILE
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Index: SHN_ABS
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: test
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Type: STT_FUNC
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Section: .text
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Binding: STB_GLOBAL
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Size: 0x20
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- Name: g
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Type: STT_OBJECT
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Section: .bss
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Binding: STB_GLOBAL
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Size: 0x4
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...
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