lld/test/ELF/eh-frame-negative-pcrel-sdata2.s

   1 # REQUIRES: x86
   2
   3 # Test handling of FDE pc negative relative addressing with DW_EH_PE_sdata2.
   4 # This situation can arise when .eh_frame is placed after .text.
   5
   6 # RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
   7 # RUN: echo "SECTIONS { .text : { *(.text) } .eh_frame : { *(.eh_frame) } }" > %t.script
   8 # RUN: ld.lld --eh-frame-hdr --script %t.script --section-start .text=0x1000 %t.o -o %t
   9 # RUN: llvm-readobj -S --section-data %t | FileCheck %s
  10
  11 # CHECK:      Section {
  12 # CHECK:        Index:
  13 # CHECK:        Name: .eh_frame
  14 # CHECK-NEXT:   Type: SHT_PROGBITS
  15 # CHECK-NEXT:   Flags [
  16 # CHECK-NEXT:     SHF_ALLOC
  17 # CHECK-NEXT:   ]
  18 # CHECK-NEXT:   Address: 0x1001
  19 # CHECK-NEXT:   Offset: 0x1001
  20 # CHECK-NEXT:   Size:
  21 # CHECK-NEXT:   Link:
  22 # CHECK-NEXT:   Info:
  23 # CHECK-NEXT:   AddressAlignment:
  24 # CHECK-NEXT:   EntrySize:
  25 # CHECK-NEXT:   SectionData (
  26 # CHECK-NEXT:     0000: 10000000 00000000 017A5200 01010101
  27 # CHECK-NEXT:     0010: 1A000000 0A000000 18000000 E3FFFFFF
  28 # CHECK-NEXT:     0020: 00000000 0000
  29 #                       ^
  30 #   DFFFFFFF = _start(0x1000) - PC(.eh_frame(0x1001) + 0x20)
  31
  32 # CHECK:      Section {
  33 # CHECK:        Index:
  34 # CHECK:        Name: .eh_frame_hdr
  35 # CHECK-NEXT:   Type: SHT_PROGBITS
  36 # CHECK-NEXT:   Flags [
  37 # CHECK-NEXT:     SHF_ALLOC
  38 # CHECK-NEXT:   ]
  39 # CHECK-NEXT:   Address: 0x1028
  40 # CHECK-NEXT:   Offset: 0x1028
  41 # CHECK-NEXT:   Size: 20
  42 # CHECK-NEXT:   Link: 0
  43 # CHECK-NEXT:   Info: 0
  44 # CHECK-NEXT:   AddressAlignment: 4
  45 # CHECK-NEXT:   EntrySize: 0
  46 # CHECK-NEXT:   SectionData (
  47 # CHECK-NEXT:     0000: 011B033B D5FFFFFF 01000000 D8FFFFFF
  48 # CHECK-NEXT:     0010: EDFFFFFF
  49 #   Header (always 4 bytes): 011B033B
  50 #   D5FFFFFF = .eh_frame(0x1001) - .eh_frame_hdr(0x1028) - 4
  51 #   01000000 = 1 = the number of FDE pointers in the table.
  52 #   D8FFFFFF = _start(0x1000) - .eh_frame_hdr(0x1028)
  53 #   EDFFFFFF = FDE(.eh_frame(0x1001) + 0x18) - .eh_frame_hdr(0x1028)
  54
  55 .text
  56 .global _start
  57 _start:
  58  nop
  59
  60 .section .eh_frame,"a",@unwind
  61   .long 16   # Size
  62   .long 0x00 # ID
  63   .byte 0x01 # Version.
  64
  65   .byte 0x7A # Augmentation string: "zR"
  66   .byte 0x52
  67   .byte 0x00
  68
  69   .byte 0x01
  70
  71   .byte 0x01 # LEB128
  72   .byte 0x01 # LEB128
  73
  74   .byte 0x01 # LEB128
  75   .byte 0x1A # DW_EH_PE_pcrel | DW_EH_PE_sdata2
  76
  77   .byte 0x00
  78   .byte 0x00
  79   .byte 0x00
  80
  81   .long 10   # Size
  82   .long 24   # ID
  83 fde:
  84   .long _start - fde
  85   .word 0