[ELF] - Add a test case to check DW_EH_PE_absptr address encoding.
This covers the following line of the code: https://github.com/llvm-mirror/lld/blob/master/ELF/SyntheticSections.cpp#L525 llvm-svn: 337377
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# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
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# RUN: ld.lld --eh-frame-hdr --section-start .text=0x1000 %t.o -o %t
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# RUN: llvm-readobj -s -section-data %t | FileCheck %s
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## Check we are able to handle DW_EH_PE_absptr encoding.
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# CHECK: Section {
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# CHECK: Index:
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# CHECK: Name: .eh_frame_hdr
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# CHECK-NEXT: Type: SHT_PROGBITS
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# CHECK-NEXT: Flags [
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# CHECK-NEXT: SHF_ALLOC
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x2000
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# CHECK-NEXT: Offset: 0x2000
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# CHECK-NEXT: Size: 20
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# CHECK-NEXT: Link: 0
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# CHECK-NEXT: Info: 0
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# CHECK-NEXT: AddressAlignment: 4
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# CHECK-NEXT: EntrySize: 0
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# CHECK-NEXT: SectionData (
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# CHECK-NEXT: 0000: 011B033B 10000000 01000000 34F2FFFF
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# CHECK-NEXT: 0010: 24000000
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# Header (always 4 bytes): 011B033B
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# 10000000 = .eh_frame(0x2014) - .eh_frame_hdr(0x2000) - 4
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# 01000000 = 1 = the number of FDE pointers in the table.
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# 34F2FFFF = foo(0x1000) - 0x234(addend) - .eh_frame_hdr(0x2000)
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# CHECK: Section {
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# CHECK: Index:
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# CHECK: Name: .eh_frame
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# CHECK-NEXT: Type: SHT_PROGBITS
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# CHECK-NEXT: Flags [
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# CHECK-NEXT: SHF_ALLOC
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# CHECK-NEXT: ]
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# CHECK-NEXT: Address: 0x2014
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# CHECK-NEXT: Offset: 0x2014
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# CHECK-NEXT: Size:
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# CHECK-NEXT: Link:
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# CHECK-NEXT: Info:
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# CHECK-NEXT: AddressAlignment:
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# CHECK-NEXT: EntrySize:
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# CHECK-NEXT: SectionData (
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# CHECK-NEXT: 0000: 0C000000 00000000 01520001 010100FF
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# CHECK-NEXT: 0010: 0C000000 14000000 34120000 00000000
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# ^
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# ---> ADDR(foo) + 0x234 = 0x1234
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.text
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.global foo
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foo:
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nop
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.section .eh_frame, "ax"
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.long 12 # Size
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.long 0x00 # ID
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.byte 0x01 # Version.
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.byte 0x52 # Augmentation string: 'R','\0'
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.byte 0x00
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.byte 0x01
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.byte 0x01 # LEB128
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.byte 0x01 # LEB128
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.byte 0x00 # DW_EH_PE_absptr
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.byte 0xFF
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.long 12 # Size
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.long 0x14 # ID
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.quad foo + 0x234
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