lld/test/ELF/arm-branch-undef-weak-plt-thunk.s

   1 // REQUIRES: arm
   2 // RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv7a-none-linux-gnueabi %S/Inputs/arm-shared.s -o %t1.o
   3 // RUN: ld.lld %t1.o --shared -soname=t1.so -o %t1.so
   4 // RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv7a-none-linux-gnueabi %s -o %t.o
   5 // RUN: ld.lld %t.o %t1.so -o %t
   6 // RUN: llvm-objdump --no-print-imm-hex -d --triple=armv7a-none-linux-gnueabi --start-address=0x201e4 --stop-address=0x20204 %t | FileCheck %s
   7
   8 /// When we are dynamic linking, undefined weak references have a PLT entry so
   9 /// we must create a thunk for the branch to the PLT entry.
  10
  11  .text
  12  .globl bar2
  13  .weak undefined_weak_we_expect_a_plt_entry_for
  14 _start:
  15  .globl _start
  16  .type _start, %function
  17  b undefined_weak_we_expect_a_plt_entry_for
  18  bl bar2
  19 /// Create 32 Mb gap between the call to the weak reference and the PLT so that
  20 /// the b and bl need a range-extension thunk.
  21  .section .text.1, "ax", %progbits
  22  .space 32 * 1024 * 1024
  23
  24 // CHECK: Disassembly of section .text:
  25 // CHECK-EMPTY:
  26 // CHECK-NEXT: <_start>:
  27 // CHECK-NEXT:    201e4:       ea000000        b       0x201ec <__ARMv7ABSLongThunk_undefined_weak_we_expect_a_plt_entry_for>
  28 // CHECK-NEXT:    201e8:       eb000002        bl      0x201f8 <__ARMv7ABSLongThunk_bar2>
  29 // CHECK: <__ARMv7ABSLongThunk_undefined_weak_we_expect_a_plt_entry_for>:
  30 // CHECK-NEXT:    201ec:        e300c240        movw    r12, #576
  31 // CHECK-NEXT:    201f0:        e340c202        movt    r12, #514
  32 // CHECK-NEXT:    201f4:        e12fff1c        bx      r12
  33 // CHECK: <__ARMv7ABSLongThunk_bar2>:
  34 // CHECK-NEXT:    201f8:        e300c230        movw    r12, #560
  35 // CHECK-NEXT:    201fc:        e340c202        movt    r12, #514
  36 // CHECK-NEXT:    20200:        e12fff1c        bx      r12