lld/test/ELF/gnu-ifunc-plt-i386.s

   1 // REQUIRES: x86
   2 // RUN: llvm-mc -filetype=obj -triple=i686-pc-linux %S/Inputs/shared2-x86-64.s -o %t1.o
   3 // RUN: ld.lld %t1.o --shared --soname=t.so -o %t.so
   4 // RUN: llvm-mc -filetype=obj -triple=i686-pc-linux %s -o %t.o
   5 // RUN: ld.lld --hash-style=sysv %t.so %t.o -o %tout
   6 // RUN: llvm-objdump -d --no-show-raw-insn --print-imm-hex %tout | FileCheck %s --check-prefix=DISASM
   7 // RUN: llvm-objdump -s %tout | FileCheck %s --check-prefix=GOTPLT
   8 // RUN: llvm-readobj -r --dynamic-table %tout | FileCheck %s
   9
  10 /// Check that the PLTRELSZ tag does not include the IRELATIVE relocations
  11 // CHECK: DynamicSection [
  12 // CHECK:  0x00000012 RELSZ                24 (bytes)
  13 // CHECK:  0x00000002 PLTRELSZ             16 (bytes)
  14
  15 /// Check that the IRELATIVE relocations are placed to the .rel.dyn section after
  16 /// other regular relocations (e.g. GLOB_DAT).
  17 // CHECK: Relocations [
  18 // CHECK-NEXT:   Section (4) .rel.dyn {
  19 // CHECK-NEXT:     0x4022C8 R_386_GLOB_DAT bar3
  20 // CHECK-NEXT:     0x4032E0 R_386_IRELATIVE -
  21 // CHECK-NEXT:     0x4032E4 R_386_IRELATIVE -
  22 // CHECK-NEXT:   }
  23 // CHECK-NEXT:   Section (5) .rel.plt {
  24 // CHECK-NEXT:     0x4032D8 R_386_JUMP_SLOT bar2
  25 // CHECK-NEXT:     0x4032DC R_386_JUMP_SLOT zed2
  26 // CHECK-NEXT:   }
  27
  28 // Check that IRELATIVE .got.plt entries point to ifunc resolver and not
  29 // back to the plt entry + 6.
  30 // GOTPLT: Contents of section .got.plt:
  31 // GOTPLT:       4032cc 50224000 00000000 00000000 16124000
  32 // GOTPLT-NEXT:  4032dc 26124000 dc114000 dd114000
  33 //                                  ^        ^-- <bar> (0x4011dd)
  34 //                                  -- <foo> (0x4011dcd)
  35
  36 /// Check that we have 2 PLT sections: one regular .plt section and one
  37 /// .iplt section for ifunc entries.
  38 // DISASM: Disassembly of section .text:
  39 // DISASM-EMPTY:
  40 // DISASM-NEXT: <foo>:
  41 // DISASM-NEXT:    4011dc:       retl
  42 // DISASM:      <bar>:
  43 // DISASM-NEXT:    4011dd:       retl
  44 // DISASM:      <_start>:
  45 // DISASM-NEXT:    4011de:       calll   0x401230
  46 // DISASM-NEXT:                  calll   0x401240
  47 // DISASM-NEXT:                  calll   0x401210 <bar2@plt>
  48 // DISASM-NEXT:                  calll   0x401220 <zed2@plt>
  49 // DISASM-NEXT:                  movl    -0x1004(%eax), %eax
  50 // DISASM-EMPTY:
  51 // DISASM-NEXT: Disassembly of section .plt:
  52 // DISASM-EMPTY:
  53 // DISASM-NEXT: <.plt>:
  54 // DISASM-NEXT:    401200:       pushl   0x4032d0
  55 // DISASM-NEXT:                  jmpl    *0x4032d4
  56 // DISASM-NEXT:                  nop
  57 // DISASM-NEXT:                  nop
  58 // DISASM-NEXT:                  nop
  59 // DISASM-NEXT:                  nop
  60 // DISASM-EMPTY:
  61 // DISASM-NEXT:   <bar2@plt>:
  62 // DISASM-NEXT:    401210:       jmpl    *0x4032d8
  63 // DISASM-NEXT:                  pushl   $0x0
  64 // DISASM-NEXT:                  jmp     0x401200 <.plt>
  65 // DISASM-EMPTY:
  66 // DISASM-NEXT:   <zed2@plt>:
  67 // DISASM-NEXT:    401220:       jmpl    *0x4032dc
  68 // DISASM-NEXT:                  pushl   $0x8
  69 // DISASM-NEXT:                  jmp     0x401200 <.plt>
  70 // DISASM-EMPTY:
  71 // DISASM-NEXT: Disassembly of section .iplt:
  72 // DISASM-EMPTY:
  73 // DISASM-NEXT: <.iplt>:
  74 // DISASM-NEXT:                  jmpl    *0x4032e0
  75 // DISASM-NEXT:                  pushl   $0x0
  76 // DISASM-NEXT:                  jmp     0x401200 <.plt>
  77 // DISASM-NEXT:                  jmpl    *0x4032e4
  78 // DISASM-NEXT:                  pushl   $0x8
  79 // DISASM-NEXT:                  jmp     0x401200 <.plt>
  80
  81 .text
  82 .type foo STT_GNU_IFUNC
  83 .globl foo
  84 foo:
  85  ret
  86
  87 .type bar STT_GNU_IFUNC
  88 .globl bar
  89 bar:
  90  ret
  91
  92 .globl _start
  93 _start:
  94  call foo@plt
  95  call bar@plt
  96  call bar2@plt
  97  call zed2@plt
  98  movl bar3@GOT(%eax), %eax