lld/test/ELF/mips-eh_frame-pic.s

   1 # REQUIRES: mips
   2 ## Check that we can link a shared library containing an eh_frame section without
   3 ## -z notext. This was not possible LLVM started emitting values using the
   4 ## DW_EH_PE_pcrel | DW_EH_PE_sdata4 encoding.
   5
   6 ## It should not be possible to link code compiled without -fPIC:
   7 # RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux %s -o %t-nopic.o
   8 # RUN: llvm-dwarfdump --eh-frame %t-nopic.o | FileCheck %s --check-prefix=ABS64-EH-FRAME
   9 # RUN: llvm-readobj -r %t-nopic.o | FileCheck %s --check-prefixes=RELOCS,ABS64-RELOCS
  10 # RUN: not ld.lld -shared %t-nopic.o -o /dev/null 2>&1 | FileCheck %s --check-prefix=NOPIC-ERR
  11 ## Note: ld.bfd can link this file because it rewrites the .eh_frame section to use
  12 ## relative addressing.
  13 # NOPIC-ERR: ld.lld: error: relocation R_MIPS_64 cannot be used against local symbol
  14
  15 ## For -fPIC, .eh_frame should contain DW_EH_PE_pcrel | DW_EH_PE_sdata4 values:
  16 # RUN: llvm-mc -filetype=obj -triple=mips64-unknown-linux --position-independent %s -o %t-pic.o
  17 # RUN: llvm-readobj -r %t-pic.o | FileCheck %s --check-prefixes=RELOCS,PIC64-RELOCS
  18 # RUN: ld.lld -shared %t-pic.o -o %t-pic.so
  19 # RUN: llvm-dwarfdump --eh-frame %t-pic.so | FileCheck %s --check-prefix=PIC-EH-FRAME
  20
  21 ## Also check MIPS32:
  22 # RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux %s -o %t-nopic32.o
  23 # RUN: llvm-dwarfdump --eh-frame %t-nopic32.o | FileCheck %s --check-prefix=ABS32-EH-FRAME
  24 # RUN: llvm-readobj -r %t-nopic32.o | FileCheck %s --check-prefixes=RELOCS,ABS32-RELOCS
  25 # RUN: not ld.lld -shared %t-nopic32.o -o /dev/null 2>&1 | FileCheck %s --check-prefix=NOPIC32-ERR
  26 ## Note: ld.bfd can link this file because it rewrites the .eh_frame section to use
  27 ## relative addressing.
  28 # NOPIC32-ERR: ld.lld: error: relocation R_MIPS_32 cannot be used against local symbol
  29
  30 ## For -fPIC, .eh_frame should contain DW_EH_PE_pcrel | DW_EH_PE_sdata4 values:
  31 # RUN: llvm-mc -filetype=obj -triple=mips-unknown-linux --position-independent %s -o %t-pic32.o
  32 # RUN: llvm-readobj -r %t-pic32.o | FileCheck %s --check-prefixes=RELOCS,PIC32-RELOCS
  33 # RUN: ld.lld -shared %t-pic32.o -o %t-pic32.so
  34 # RUN: llvm-dwarfdump --eh-frame %t-pic32.so | FileCheck %s --check-prefix=PIC-EH-FRAME
  35
  36 # RELOCS:            .rel{{a?}}.eh_frame {
  37 # ABS32-RELOCS-NEXT:   0x1C R_MIPS_32 .text
  38 # ABS64-RELOCS-NEXT:   0x1C R_MIPS_64/R_MIPS_NONE/R_MIPS_NONE .text
  39 # PIC64-RELOCS-NEXT:   0x1C R_MIPS_PC32/R_MIPS_NONE/R_MIPS_NONE <null>
  40 # PIC32-RELOCS-NEXT:   0x1C R_MIPS_PC32 <null>
  41 # RELOCS-NEXT:       }
  42
  43 # ABS64-EH-FRAME: Augmentation data: 0C
  44 ##                                   ^^ fde pointer encoding: DW_EH_PE_sdata8
  45 # ABS32-EH-FRAME: Augmentation data: 0B
  46 ##                                   ^^ fde pointer encoding: DW_EH_PE_sdata4
  47 # PIC-EH-FRAME: Augmentation data: 1B
  48 ##                                 ^^ fde pointer encoding: DW_EH_PE_pcrel | DW_EH_PE_sdata4
  49 ## Note: ld.bfd converts the R_MIPS_64 relocs to DW_EH_PE_pcrel | DW_EH_PE_sdata8
  50 ## for N64 ABI (and DW_EH_PE_pcrel | DW_EH_PE_sdata4 for MIPS32)
  51
  52 .ent func
  53 .global func
  54 func:
  55         .cfi_startproc
  56         nop
  57         .cfi_endproc
  58 .end func