lld/test/ELF/mips-jalr-non-functions.s

   1 # REQUIRES: mips
   2 ## Check that we ignore R_MIPS_JALR relocations agains non-function symbols.
   3 ## Older versions of clang were erroneously generating them for function pointers
   4 ## loaded from any table (not just the GOT) as well as against TLS function
   5 ## pointers (when using the local-dynamic model), so we need to ignore these
   6 ## relocations to avoid generating binaries that crash when executed.
   7
   8 # RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux %s -o %t.o
   9 ## Link in another object file with a .bss as a regression test:
  10 ## Previously LLD asserted when skipping over .bss sections when determining the
  11 ## location for a warning/error message. By adding another file with a .bss
  12 ## section before the actual %t.o we can reproduce this case.
  13 # RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux %S/Inputs/common.s -o %t-common.o
  14 # RUN: ld.lld -shared %t-common.o %t.o -o %t.so 2>&1 | FileCheck %s -check-prefix WARNING-MESSAGE
  15 # RUN: llvm-objdump --no-show-raw-insn --no-leading-addr -d %t.so | FileCheck %s
  16
  17 .set    noreorder
  18 test:
  19   .reloc .Ltmp1, R_MIPS_JALR, tls_obj
  20 .Ltmp1:
  21   jr  $t9
  22   nop
  23 # WARNING-MESSAGE: warning: {{.+}}.tmp.o:(.text+0x0): found R_MIPS_JALR relocation against non-function symbol tls_obj. This is invalid and most likely a compiler bug.
  24
  25   .reloc .Ltmp2, R_MIPS_JALR, reg_obj
  26 .Ltmp2:
  27   jr  $t9
  28   nop
  29 # WARNING-MESSAGE: warning: {{.+}}.tmp.o:(.text+0x8): found R_MIPS_JALR relocation against non-function symbol reg_obj. This is invalid and most likely a compiler bug.
  30
  31   .reloc .Ltmp3, R_MIPS_JALR, untyped
  32 .Ltmp3:
  33   jr  $t9
  34   nop
  35
  36 ## However, we do perform the optimization for untyped symbols:
  37 untyped:
  38   nop
  39
  40   .type  tls_obj,@object
  41   .section  .tbss,"awT",@nobits
  42 tls_obj:
  43   .word 0
  44
  45   .type  reg_obj,@object
  46   .data
  47 reg_obj:
  48   .word 0
  49
  50 # CHECK-LABEL: Disassembly of section .text:
  51 # CHECK-EMPTY:
  52 # CHECK-NEXT: <test>:
  53 # CHECK-NEXT: jr        $25
  54 # CHECK-NEXT: nop
  55 # CHECK-NEXT: jr        $25
  56 # CHECK-NEXT: nop
  57 # CHECK-NEXT: b 8 <untyped>
  58 # CHECK-NEXT: nop