lld/test/ELF/i386-plt.s

   1 // REQUIRES: x86
   2 // RUN: llvm-mc -filetype=obj -triple=i686-unknown-linux %s -o %t.o
   3 // RUN: llvm-mc -filetype=obj -triple=i686-unknown-linux %p/Inputs/shared.s -o %t2.o
   4 // RUN: ld.lld -shared %t2.o -soname=t2.so -o %t2.so
   5 // RUN: ld.lld %t.o %t2.so -o %t
   6 // RUN: llvm-readobj -S -r %t | FileCheck %s
   7 // RUN: llvm-objdump -d --no-show-raw-insn --print-imm-hex %t | FileCheck --check-prefix=DISASM %s
   8 // RUN: ld.lld -shared %t.o %t2.so -o %t
   9 // RUN: llvm-readobj -S -r %t | FileCheck --check-prefix=CHECKSHARED %s
  10 // RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t | FileCheck --check-prefix=DISASMSHARED %s
  11 // RUN: ld.lld -pie %t.o %t2.so -o %t
  12 // RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t | FileCheck --check-prefix=DISASMPIE %s
  13
  14 // CHECK:      Name: .plt
  15 // CHECK-NEXT: Type: SHT_PROGBITS
  16 // CHECK-NEXT: Flags [
  17 // CHECK-NEXT:   SHF_ALLOC
  18 // CHECK-NEXT:   SHF_EXECINSTR
  19 // CHECK-NEXT: ]
  20 // CHECK-NEXT: Address: 0x4011E0
  21 // CHECK-NEXT: Offset:
  22 // CHECK-NEXT: Size: 48
  23 // CHECK-NEXT: Link: 0
  24 // CHECK-NEXT: Info: 0
  25 // CHECK-NEXT: AddressAlignment: 16
  26
  27 // CHECK:      Name: .got.plt
  28 // CHECK-NEXT: Type: SHT_PROGBITS
  29 // CHECK-NEXT: Flags [
  30 // CHECK-NEXT:   SHF_ALLOC
  31 // CHECK-NEXT:   SHF_WRITE
  32 // CHECK-NEXT: ]
  33 // CHECK-NEXT: Address: 0x403278
  34 // CHECK-NEXT: Offset: 0x278
  35 // CHECK-NEXT: Size: 20
  36 // CHECK-NEXT: Link: 0
  37 // CHECK-NEXT: Info: 0
  38 // CHECK-NEXT: AddressAlignment: 4
  39 // CHECK-NEXT: EntrySize: 0
  40
  41 // First 3 slots of .got.plt are reserved.
  42 // &.got.plt[3] = 0x403278 + 12 = 0x403284
  43 // &.got.plt[4] = 0x403278 + 16 = 0x403288
  44 // CHECK:      Relocations [
  45 // CHECK-NEXT:   Section ({{.*}}) .rel.plt {
  46 // CHECK-NEXT:     0x403284 R_386_JUMP_SLOT bar
  47 // CHECK-NEXT:     0x403288 R_386_JUMP_SLOT zed
  48 // CHECK-NEXT:   }
  49 // CHECK-NEXT: ]
  50
  51 // DISASM:       <local>:
  52 // DISASM-NEXT:  4011bc:
  53 // DISASM-NEXT:  4011be:
  54 // DISASM:       <_start>:
  55 // DISASM-NEXT: 4011c0:       jmp 0x4011f0 <bar@plt>
  56 // DISASM-NEXT: 4011c5:       jmp 0x4011f0 <bar@plt>
  57 // DISASM-NEXT: 4011ca:       jmp 0x401200 <zed@plt>
  58 // DISASM-NEXT: 4011cf:       jmp 0x4011bc <local>
  59
  60 // DISASM:      Disassembly of section .plt:
  61 // DISASM-EMPTY:
  62 // DISASM-NEXT: <.plt>:
  63 /// Push .got.plt[1], then jump to .got.plt[2]
  64 // DISASM-NEXT: 4011e0:       pushl 0x40327c
  65 // DISASM-NEXT:               jmpl *0x403280
  66 // DISASM-NEXT:               nop
  67 // DISASM-NEXT:               nop
  68 // DISASM-NEXT:               nop
  69 // DISASM-NEXT:               nop
  70 // DISASM-EMPTY:
  71 // DISASM-NEXT: <bar@plt>:
  72 /// .got.plt[3] = 0x403278 + 12 = 0x403284
  73 // DISASM-NEXT: 4011f0:       jmpl *0x403284
  74 // DISASM-NEXT:               pushl $0x0
  75 // DISASM-NEXT:               jmp 0x4011e0 <.plt>
  76 // DISASM-EMPTY:
  77 // DISASM-NEXT: <zed@plt>:
  78 /// .got.plt[4] = 0x403278 + 16 = 0x403288
  79 // DISASM-NEXT: 401200:       jmpl *0x403288
  80 // DISASM-NEXT:               pushl $0x8
  81 // DISASM-NEXT:               jmp 0x4011e0 <.plt>
  82
  83 // CHECKSHARED:        Name: .plt
  84 // CHECKSHARED-NEXT:   Type: SHT_PROGBITS
  85 // CHECKSHARED-NEXT:   Flags [
  86 // CHECKSHARED-NEXT:     SHF_ALLOC
  87 // CHECKSHARED-NEXT:     SHF_EXECINSTR
  88 // CHECKSHARED-NEXT:   ]
  89 // CHECKSHARED-NEXT:   Address: 0x1200
  90 // CHECKSHARED-NEXT:   Offset: 0x200
  91 // CHECKSHARED-NEXT:   Size: 48
  92 // CHECKSHARED-NEXT:   Link: 0
  93 // CHECKSHARED-NEXT:   Info: 0
  94 // CHECKSHARED-NEXT:   AddressAlignment: 16
  95 // CHECKSHARED-NEXT:   EntrySize: 0
  96 // CHECKSHARED-NEXT:   }
  97 // CHECKSHARED:        Name: .got.plt
  98 // CHECKSHARED-NEXT:   Type: SHT_PROGBITS
  99 // CHECKSHARED-NEXT:   Flags [
 100 // CHECKSHARED-NEXT:     SHF_ALLOC
 101 // CHECKSHARED-NEXT:     SHF_WRITE
 102 // CHECKSHARED-NEXT:   ]
 103 // CHECKSHARED-NEXT:   Address: 0x3290
 104 // CHECKSHARED-NEXT:   Offset: 0x290
 105 // CHECKSHARED-NEXT:   Size: 20
 106 // CHECKSHARED-NEXT:   Link: 0
 107 // CHECKSHARED-NEXT:   Info: 0
 108 // CHECKSHARED-NEXT:   AddressAlignment: 4
 109 // CHECKSHARED-NEXT:   EntrySize: 0
 110 // CHECKSHARED-NEXT:   }
 111
 112 // 0x3000 + got.plt.reserved(12) = 0x300C
 113 // 0x3000 + got.plt.reserved(12) + 4 = 0x3010
 114 // CHECKSHARED:        Relocations [
 115 // CHECKSHARED-NEXT:     Section ({{.*}}) .rel.plt {
 116 // CHECKSHARED-NEXT:       0x329C R_386_JUMP_SLOT bar
 117 // CHECKSHARED-NEXT:       0x32A0 R_386_JUMP_SLOT zed
 118 // CHECKSHARED-NEXT:     }
 119 // CHECKSHARED-NEXT:   ]
 120
 121 // DISASMSHARED:      <local>:
 122 // DISASMSHARED-NEXT: 11e0:
 123 // DISASMSHARED-NEXT: 11e2:
 124 // DISASMSHARED:      <_start>:
 125 // DISASMSHARED-NEXT: 11e4:       jmp 0x1210 <bar@plt>
 126 // DISASMSHARED-NEXT:             jmp 0x1210 <bar@plt>
 127 // DISASMSHARED-NEXT:             jmp 0x1220 <zed@plt>
 128 // DISASMSHARED-NEXT:             jmp 0x11e0 <local>
 129 // DISASMSHARED-EMPTY:
 130 // DISASMSHARED-NEXT: Disassembly of section .plt:
 131 // DISASMSHARED-EMPTY:
 132 // DISASMSHARED-NEXT: <.plt>:
 133 // DISASMSHARED-NEXT: 1200:       pushl 4(%ebx)
 134 // DISASMSHARED-NEXT:             jmpl *8(%ebx)
 135 // DISASMSHARED-NEXT:             nop
 136 // DISASMSHARED-NEXT:             nop
 137 // DISASMSHARED-NEXT:             nop
 138 // DISASMSHARED-NEXT:             nop
 139 // DISASMSHARED:      <bar@plt>:
 140 // DISASMSHARED-NEXT: 1210:       jmpl *12(%ebx)
 141 // DISASMSHARED-NEXT:             pushl $0
 142 // DISASMSHARED-NEXT:             jmp 0x1200 <.plt>
 143 // DISASMSHARED:      <zed@plt>:
 144 // DISASMSHARED-NEXT: 1220:       jmpl *16(%ebx)
 145 // DISASMSHARED-NEXT:             pushl $8
 146 // DISASMSHARED-NEXT:             jmp 0x1200 <.plt>
 147
 148 // DISASMPIE:      Disassembly of section .plt:
 149 // DISASMPIE-EMPTY:
 150 // DISASMPIE-NEXT: <.plt>:
 151 // DISASMPIE-NEXT: 11e0:       pushl 4(%ebx)
 152 // DISASMPIE-NEXT:             jmpl *8(%ebx)
 153 // DISASMPIE-NEXT:             nop
 154 // DISASMPIE-NEXT:             nop
 155 // DISASMPIE-NEXT:             nop
 156 // DISASMPIE-NEXT:             nop
 157 // DISASMPIE-EMPTY:
 158 // DISASMPIE-NEXT: <bar@plt>:
 159 // DISASMPIE-NEXT: 11f0:       jmpl *12(%ebx)
 160 // DISASMPIE-NEXT:             pushl $0
 161 // DISASMPIE-NEXT:             jmp 0x11e0 <.plt>
 162 // DISASMPIE-EMPTY:
 163 // DISASMPIE-NEXT: <zed@plt>:
 164 // DISASMPIE-NEXT: 1200:       jmpl *16(%ebx)
 165 // DISASMPIE-NEXT:             pushl $8
 166 // DISASMPIE-NEXT:             jmp 0x11e0 <.plt>
 167
 168 local:
 169 .long 0
 170
 171 .global _start
 172 _start:
 173   jmp bar@PLT
 174   jmp bar@PLT
 175   jmp zed@PLT
 176   jmp local@plt