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llvm-project/lld/test/ELF/eh-frame-negative-pcrel-sda...

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[ELF] Fix handling of FDE negative relative PC addr Signed values for the FDE PC addr were not correctly handled in readFdeAddr(). If the value is negative and the type of the value is smaller than 64 bits, the FDE PC addr overflow error would be incorrectly triggered. Fixed readFdeAddr() to properly handle signed values by sign extending where appropriate. Differential Revision: https://reviews.llvm.org/D49557 llvm-svn: 337683
2018-07-23 19:29:46 +08:00
# REQUIRES: x86
# Test handling of FDE pc negative relative addressing with DW_EH_PE_sdata4.
# This situation can arise when .eh_frame is placed after .text.
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: echo "SECTIONS { .text : { *(.text) } .eh_frame : { *(.eh_frame) } }" > %t.script
# RUN: ld.lld --eh-frame-hdr --script %t.script --section-start .text=0x1000 %t.o -o %t
[test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC Also change some options that have different semantics (cause confusion) in llvm-readelf mode: -s => -S -t => --symbols -sd => --section-data llvm-svn: 359651
2019-05-01 13:49:01 +08:00
# RUN: llvm-readobj -S --section-data %t | FileCheck %s
[ELF] Fix handling of FDE negative relative PC addr Signed values for the FDE PC addr were not correctly handled in readFdeAddr(). If the value is negative and the type of the value is smaller than 64 bits, the FDE PC addr overflow error would be incorrectly triggered. Fixed readFdeAddr() to properly handle signed values by sign extending where appropriate. Differential Revision: https://reviews.llvm.org/D49557 llvm-svn: 337683
2018-07-23 19:29:46 +08:00
# CHECK: Section {
# CHECK: Index:
# CHECK: Name: .eh_frame
# CHECK-NEXT: Type: SHT_PROGBITS
# CHECK-NEXT: Flags [
# CHECK-NEXT: SHF_ALLOC
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x1001
# CHECK-NEXT: Offset: 0x1001
# CHECK-NEXT: Size:
# CHECK-NEXT: Link:
# CHECK-NEXT: Info:
# CHECK-NEXT: AddressAlignment:
# CHECK-NEXT: EntrySize:
# CHECK-NEXT: SectionData (
# CHECK-NEXT: 0000: 14000000 00000000 017A5200 01010101
# CHECK-NEXT: 0010: 1B000000 00000000 0C000000 1C000000
# CHECK-NEXT: 0020: DFFFFFFF
# ^
# DFFFFFFF = _start(0x1000) - PC(.eh_frame(0x1001) + 0x20)
# CHECK: Section {
# CHECK: Index:
# CHECK: Name: .eh_frame_hdr
# CHECK-NEXT: Type: SHT_PROGBITS
# CHECK-NEXT: Flags [
# CHECK-NEXT: SHF_ALLOC
# CHECK-NEXT: ]
# CHECK-NEXT: Address: 0x1030
# CHECK-NEXT: Offset: 0x1030
# CHECK-NEXT: Size: 20
# CHECK-NEXT: Link: 0
# CHECK-NEXT: Info: 0
# CHECK-NEXT: AddressAlignment: 4
# CHECK-NEXT: EntrySize: 0
# CHECK-NEXT: SectionData (
# CHECK-NEXT: 0000: 011B033B CDFFFFFF 01000000 D0FFFFFF
# CHECK-NEXT: 0010: E9FFFFFF
# Header (always 4 bytes): 011B033B
# CDFFFFFF = .eh_frame(0x1001) - .eh_frame_hdr(0x1030) - 4
# 01000000 = 1 = the number of FDE pointers in the table.
# D0FFFFFF = _start(0x1000) - .eh_frame_hdr(0x1030)
# E9FFFFFF = FDE(.eh_frame(0x1001) + 0x18) - .eh_frame_hdr(0x1030)
.text
.global _start
_start:
nop
[ELF][test] Fix section sh_type and sh_flags A future MC change may add a warning/error when a .section directive specifies incorrect sh_flags/sh_type.
2020-02-20 13:27:13 +08:00
.section .eh_frame,"a",@unwind
[ELF] Fix handling of FDE negative relative PC addr Signed values for the FDE PC addr were not correctly handled in readFdeAddr(). If the value is negative and the type of the value is smaller than 64 bits, the FDE PC addr overflow error would be incorrectly triggered. Fixed readFdeAddr() to properly handle signed values by sign extending where appropriate. Differential Revision: https://reviews.llvm.org/D49557 llvm-svn: 337683
2018-07-23 19:29:46 +08:00
.long 16 # Size
.long 0x00 # ID
.byte 0x01 # Version.
.byte 0x7A # Augmentation string: "zR"
.byte 0x52
.byte 0x00
.byte 0x01
.byte 0x01 # LEB128
.byte 0x01 # LEB128
.byte 0x01 # LEB128
.byte 0x1B # DW_EH_PE_pcrel | DW_EH_PE_sdata4
.byte 0x00
.byte 0x00
.byte 0x00
.long 12 # Size
.long 24 # ID
fde:
.long _start - fde
.long 0