lld/test/ELF/arm-thumb-plt-reloc.s

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %p/Inputs/arm-plt-reloc.s -o %t1
   3 // RUN: llvm-mc -filetype=obj -triple=thumbv7a-none-linux-gnueabi %s -o %t2
   4 // RUN: ld.lld %t1 %t2 -o %t
   5 // RUN: llvm-objdump --triple=thumbv7a-none-linux-gnueabi -d %t | FileCheck %s
   6 // RUN: ld.lld -shared %t1 %t2 -o %t.so
   7 // RUN: llvm-objdump --triple=thumbv7a-none-linux-gnueabi -d %t.so | FileCheck --check-prefix=DSO %s
   8 // RUN: llvm-readobj -S -r %t.so | FileCheck -check-prefix=DSOREL %s
   9 //
  10 // Test PLT entry generation
  11  .syntax unified
  12  .text
  13  .align 2
  14  .globl _start
  15  .type  _start,%function
  16 _start:
  17 // FIXME, interworking is only supported for BL via BLX at the moment, when
  18 // interworking thunks are available for b.w and b<cond>.w this can be altered
  19 // to test the different forms of interworking.
  20  bl func1
  21  bl func2
  22  bl func3
  23
  24 // Executable, expect no PLT
  25 // CHECK: Disassembly of section .text:
  26 // CHECK-EMPTY:
  27 // CHECK-NEXT: <func1>:
  28 // CHECK-NEXT:   200b4: 70 47   bx      lr
  29 // CHECK: <func2>:
  30 // CHECK-NEXT:   200b6: 70 47   bx      lr
  31 // CHECK: <func3>:
  32 // CHECK-NEXT:   200b8: 70 47   bx      lr
  33 // CHECK-NEXT:   200ba: d4 d4
  34 // CHECK: <_start>:
  35 // CHECK-NEXT:   200bc: ff f7 fa ff     bl      0x200b4 <func1>
  36 // CHECK-NEXT:   200c0: ff f7 f9 ff     bl      0x200b6 <func2>
  37 // CHECK-NEXT:   200c4: ff f7 f8 ff     bl      0x200b8 <func3>
  38
  39 // Expect PLT entries as symbols can be preempted
  40 // .text is Thumb and .plt is ARM, llvm-objdump can currently only disassemble
  41 // as ARM or Thumb. Work around by disassembling twice.
  42 // DSO: Disassembly of section .text:
  43 // DSO-EMPTY:
  44 // DSO-NEXT: <func1>:
  45 // DSO-NEXT:     10214:     70 47   bx      lr
  46 // DSO: <func2>:
  47 // DSO-NEXT:     10216:     70 47   bx      lr
  48 // DSO: <func3>:
  49 // DSO-NEXT:     10218:     70 47   bx      lr
  50 // DSO-NEXT:     1021a:     d4 d4
  51 // DSO: <_start>:
  52 // 0x10250 = PLT func1
  53 // DSO-NEXT:     1021c:     00 f0 18 e8     blx     0x10250
  54 // 0x10260 = PLT func2
  55 // DSO-NEXT:     10220:     00 f0 1e e8     blx     0x10260
  56 // 0x10270 = PLT func3
  57 // DSO-NEXT:     10224:     00 f0 24 e8     blx     0x10270
  58 // DSO: Disassembly of section .plt:
  59 // DSO-EMPTY:
  60 // DSO-NEXT: <$a>:
  61 // DSO-NEXT:     10230:       04 e0 2d e5     str     lr, [sp, #-4]!
  62 // (0x10234 + 8) + (0 RoR 12) + (32 RoR 20 = 0x20000) + 164 = 0x302e0 = .got.plt[2]
  63 // DSO-NEXT:     10234:       00 e6 8f e2     add     lr, pc, #0, #12
  64 // DSO-NEXT:     10238:       20 ea 8e e2     add     lr, lr, #32, #20
  65 // DSO-NEXT:     1023c:       a4 f0 be e5     ldr     pc, [lr, #164]!
  66 // DSO: <$d>:
  67
  68 // DSO-NEXT:     10240:       d4 d4 d4 d4     .word   0xd4d4d4d4
  69 // DSO-NEXT:     10244:       d4 d4 d4 d4     .word   0xd4d4d4d4
  70 // DSO-NEXT:     10248:       d4 d4 d4 d4     .word   0xd4d4d4d4
  71 // DSO-NEXT:     1024c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  72 // DSO: <$a>:
  73 // (0x10250 + 8) + (0 RoR 12) + (32 RoR 20 = 0x20000) + 140 = 0x302e4
  74 // DSO-NEXT:     10250:       00 c6 8f e2     add     r12, pc, #0, #12
  75 // DSO-NEXT:     10254:       20 ca 8c e2     add     r12, r12, #32, #20
  76 // DSO-NEXT:     10258:       8c f0 bc e5     ldr     pc, [r12, #140]!
  77 // DSO: <$d>:
  78 // DSO-NEXT:     1025c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  79 // DSO: <$a>:
  80 // (0x10260 + 8) + (0 RoR 12) + (32 RoR 20 = 0x20000) + 128 = 0x302e8
  81 // DSO-NEXT:     10260:       00 c6 8f e2     add     r12, pc, #0, #12
  82 // DSO-NEXT:     10264:       20 ca 8c e2     add     r12, r12, #32, #20
  83 // DSO-NEXT:     10268:       80 f0 bc e5     ldr     pc, [r12, #128]!
  84 // DSO: <$d>:
  85 // DSO-NEXT:     1026c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  86 // DSO: <$a>:
  87 // (0x10270 + 8) + (0 RoR 12) + (32 RoR 20 = 0x20000) + 116 = 0x302ec
  88 // DSO-NEXT:     10270:       00 c6 8f e2     add     r12, pc, #0, #12
  89 // DSO-NEXT:     10274:       20 ca 8c e2     add     r12, r12, #32, #20
  90 // DSO-NEXT:     10278:       74 f0 bc e5     ldr     pc, [r12, #116]!
  91 // DSO: <$d>:
  92 // DSO-NEXT:     1027c:       d4 d4 d4 d4     .word   0xd4d4d4d4
  93
  94 // DSOREL:    Name: .got.plt
  95 // DSOREL-NEXT:    Type: SHT_PROGBITS
  96 // DSOREL-NEXT:    Flags [
  97 // DSOREL-NEXT:      SHF_ALLOC
  98 // DSOREL-NEXT:      SHF_WRITE
  99 // DSOREL-NEXT:    ]
 100 // DSOREL-NEXT:    Address: 0x302D8
 101 // DSOREL-NEXT:    Offset:
 102 // DSOREL-NEXT:    Size: 24
 103 // DSOREL-NEXT:    Link:
 104 // DSOREL-NEXT:    Info:
 105 // DSOREL-NEXT:    AddressAlignment: 4
 106 // DSOREL-NEXT:    EntrySize:
 107 // DSOREL:  Relocations [
 108 // DSOREL-NEXT:  Section (5) .rel.plt {
 109 // DSOREL-NEXT:    0x302E4 R_ARM_JUMP_SLOT func1
 110 // DSOREL-NEXT:    0x302E8 R_ARM_JUMP_SLOT func2
 111 // DSOREL-NEXT:    0x302EC R_ARM_JUMP_SLOT func3