llvm/test/MC/ELF/relocation-alias.s

   1 # RUN: llvm-mc -filetype=obj -triple x86_64 %s -o %t
   2 # RUN: llvm-objdump --no-print-imm-hex -dr %t | FileCheck %s
   3 # RUN: llvm-readelf -s %t | FileCheck %s --check-prefix=SYM
   4
   5 # RUN: not llvm-mc -filetype=obj -triple x86_64 --defsym ERR=1 %s 2>&1 | FileCheck %s --check-prefix=ERR
   6
   7 ## If a fixup symbol is equated to an undefined symbol, convert the fixup
   8 ## to be against the target symbol, even if there is a variant (@PLT).
   9 # CHECK:      callq {{.*}}
  10 # CHECK-NEXT:   R_X86_64_PLT32  __GI_memcpy-0x4
  11 # CHECK:      movabsq $0, %rax
  12 # CHECK-NEXT:   R_X86_64_64  __GI_memcpy+0x2
  13 memcpy = __GI_memcpy
  14 call memcpy@PLT
  15 movabsq $memcpy+2, %rax
  16
  17 # CHECK:      movq (%rip), %rax
  18 # CHECK-NEXT:   R_X86_64_REX_GOTPCRELX  abs-0x4
  19 # CHECK:      movq (%rip), %r16
  20 # CHECK-NEXT:   R_X86_64_CODE_4_GOTPCRELX abs-0x4
  21 movq abs@GOTPCREL(%rip), %rax
  22 movq abs@GOTPCREL(%rip), %r16
  23 abs = 42
  24
  25 # CHECK:      movabsq $0, %rbx
  26 # CHECK-NEXT:   R_X86_64_64  data_alias
  27 .globl data_alias
  28 .set data_alias, data
  29 movabsq $data_alias, %rbx
  30
  31 ## A local alias to a defined symbol still references a section symbol.
  32 # CHECK:      movabsq $0, %rbx
  33 # CHECK-NEXT:   R_X86_64_64  .data+0x1
  34 .set data_alias_l, data
  35 movabsq $data_alias_l, %rbx
  36
  37 .data
  38 .byte 0
  39 .globl data
  40 data:
  41
  42 .ifdef ERR
  43 .text
  44 ## Note, GNU as emits a relocation for this erroneous fixup.
  45 # ERR: {{.*}}.s:[[#@LINE+2]]:1: error: expected relocatable expression
  46 memcpy_plus_1 = __GI_memcpy+1
  47 call memcpy_plus_1@PLT
  48 .endif
  49
  50 ## Redirected symbols do not have a symbol table entry.
  51 # SYM:      NOTYPE  LOCAL  DEFAULT UND
  52 # SYM-NEXT: NOTYPE  LOCAL  DEFAULT ABS abs
  53 # SYM-NEXT: NOTYPE  LOCAL  DEFAULT   4 data_alias_l
  54 # SYM-NEXT: SECTION LOCAL  DEFAULT   4 .data
  55 # SYM-NEXT: NOTYPE  GLOBAL DEFAULT UND __GI_memcpy
  56 # SYM-NEXT: NOTYPE  GLOBAL DEFAULT   4 data_alias
  57 # SYM-NEXT: NOTYPE  GLOBAL DEFAULT   4 data
  58 # SYM-NOT:  {{.}}