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

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -filetype=obj -triple=armv7a-linux-gnueabihf %S/Inputs/arm-shared.s -o %t1.o
   3 // RUN: ld.lld %t1.o --shared -soname=t.so -o %t.so
   4 // RUN: llvm-mc -filetype=obj -triple=armv7a-linux-gnueabihf %s -o %t.o
   5 // RUN: ld.lld %t.so %t.o -o %tout
   6 // RUN: llvm-objdump --no-print-imm-hex --triple=armv7a-linux-gnueabihf -d --no-show-raw-insn %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 IRELATIVE relocations are last in the .got
  11 // CHECK: Relocations [
  12 // CHECK-NEXT:   Section (5) .rel.dyn {
  13 // CHECK-NEXT:     0x302E0 R_ARM_GLOB_DAT bar2
  14 // CHECK-NEXT:     0x302E4 R_ARM_GLOB_DAT zed2
  15 // CHECK-NEXT:     0x302E8 R_ARM_IRELATIVE -
  16 // CHECK-NEXT:     0x302EC R_ARM_IRELATIVE -
  17 // CHECK-NEXT:   }
  18 // CHECK-NEXT:   Section (6) .rel.plt {
  19 // CHECK-NEXT:     0x402FC R_ARM_JUMP_SLOT bar2
  20 // CHECK-NEXT:     0x40300 R_ARM_JUMP_SLOT zed2
  21 // CHECK-NEXT:   }
  22 // CHECK-NEXT: ]
  23
  24 // Check that the GOT entries refer back to the ifunc resolver
  25 // GOTPLT: Contents of section .got:
  26 // GOTPLT-NEXT:  302e0 00000000 00000000 dc010200 e0010200
  27 // GOTPLT: Contents of section .got.plt:
  28 // GOTPLT-NEXT:  402f0 00000000 00000000 00000000 00020200
  29 // GOTPLT-NEXT:  40300 00020200
  30
  31 // DISASM: Disassembly of section .text:
  32 // DISASM-EMPTY:
  33 // DISASM-NEXT: <foo>:
  34 // DISASM-NEXT:    201dc:       bx      lr
  35 // DISASM: <bar>:
  36 // DISASM-NEXT:    201e0:       bx      lr
  37 // DISASM: <_start>:
  38 // DISASM-NEXT:    201e4:       bl      0x20240
  39 // DISASM-NEXT:    201e8:       bl      0x20250
  40 // DISASM-NEXT:    201ec:       00 00 00 00     .word   0x00000000
  41 // DISASM-NEXT:    201f0:       04 00 00 00     .word   0x00000004
  42 // DISASM:         201f4:       bl      0x20220
  43 // DISASM-NEXT:    201f8:       bl      0x20230
  44 // DISASM-EMPTY:
  45 // DISASM-NEXT: Disassembly of section .plt:
  46 // DISASM-EMPTY:
  47 // DISASM-NEXT: <.plt>:
  48 // DISASM-NEXT:    20200:       str     lr, [sp, #-4]!
  49 // DISASM-NEXT:    20204:       add     lr, pc, #0, #12
  50 // DISASM-NEXT:    20208:       add     lr, lr, #32
  51 // DISASM-NEXT:    2020c:       ldr     pc, [lr, #236]!
  52 // DISASM-NEXT:    20210:       d4 d4 d4 d4     .word   0xd4d4d4d4
  53 // DISASM-NEXT:    20214:       d4 d4 d4 d4     .word   0xd4d4d4d4
  54 // DISASM-NEXT:    20218:       d4 d4 d4 d4     .word   0xd4d4d4d4
  55 // DISASM-NEXT:    2021c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  56 // DISASM-NEXT:    20220:       add     r12, pc, #0, #12
  57 // DISASM-NEXT:    20224:       add     r12, r12, #32
  58 // DISASM-NEXT:    20228:       ldr     pc, [r12, #212]!
  59 // DISASM-NEXT:    2022c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  60 // DISASM-NEXT:    20230:       add     r12, pc, #0, #12
  61 // DISASM-NEXT:    20234:       add     r12, r12, #32
  62 // DISASM-NEXT:    20238:       ldr     pc, [r12, #200]!
  63 // DISASM-NEXT:    2023c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  64 // DISASM:       <.iplt>:
  65 // DISASM-NEXT:    20240:       add     r12, pc, #0, #12
  66 // DISASM-NEXT:    20244:       add     r12, r12, #16
  67 // DISASM-NEXT:    20248:       ldr     pc, [r12, #160]!
  68 // DISASM-NEXT:    2024c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  69 // DISASM-NEXT:    20250:       add     r12, pc, #0, #12
  70 // DISASM-NEXT:    20254:       add     r12, r12, #16
  71 // DISASM-NEXT:    20258:       ldr     pc, [r12, #148]!
  72 // DISASM-NEXT:    2025c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  73
  74 .syntax unified
  75 .text
  76 .type foo STT_GNU_IFUNC
  77 .globl foo
  78 foo:
  79  bx lr
  80
  81 .type bar STT_GNU_IFUNC
  82 .globl bar
  83 bar:
  84  bx lr
  85
  86 .globl _start
  87 _start:
  88  bl foo
  89  bl bar
  90  // Create entries in the .got and .rel.dyn so that we don't just have
  91  // IRELATIVE
  92  .word bar2(got)
  93  .word zed2(got)
  94  bl bar2
  95  bl zed2