lld/test/ELF/arm-thunk-reuse.s

   1 # REQUIRES: arm
   2 # RUN: rm -rf %t && split-file %s %t
   3 # RUN: llvm-mc -filetype=obj -triple=armv7-a-none-eabi --arm-add-build-attributes %t/a.s -o %t/a.o
   4 # RUN: ld.lld -pie -T %t/lds %t/a.o -o %t/a
   5 # RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/a | FileCheck %s
   6 # RUN: llvm-objdump -s --triple=armv7a-none-linux-gnueabi %t/a | FileCheck --check-prefix=CHECK-LE %s
   7
   8 # RUN: llvm-mc -filetype=obj -triple=armv7eb-a-none-eabi --arm-add-build-attributes -mcpu=cortex-a8 %t/a.s -o %t/a.o
   9 # RUN: ld.lld -pie -T %t/lds %t/a.o -o %t/a
  10 # RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/a | FileCheck %s
  11 # RUN: llvm-objdump -s --triple=armv7eb-a-none-eabi %t/a| FileCheck --check-prefix=CHECK-EB %s
  12 # RUN: ld.lld --be8 -pie -T %t/lds %t/a.o -o %t/a
  13 # RUN: llvm-objdump --no-print-imm-hex -d --no-show-raw-insn %t/a | FileCheck %s
  14 # RUN: llvm-objdump -s --triple=armv7eb-a-none-eabi %t/a| FileCheck --check-prefix=CHECK-LE %s
  15
  16 ## We create a thunk for dest.
  17 # CHECK-LABEL: <mid>:
  18 # CHECK-NEXT:   2010004:     b       0x2010008 <__ARMV7PILongThunk_dest>
  19 # CHECK-EMPTY:
  20 # CHECK-NEXT:  <__ARMV7PILongThunk_dest>:
  21 # CHECK-NEXT:   2010008:     movw    r12, #65516
  22 # CHECK-NEXT:                movt    r12, #65023
  23 # CHECK-NEXT:                add     r12, r12, pc
  24 # CHECK-NEXT:                bx      r12
  25
  26 ## The first instruction can reuse the thunk but the second can't.
  27 ## If we reuse the thunk for b, we will get an "out of range" error.
  28 # CHECK-LABEL: <high>:
  29 # CHECK-NEXT:   4010000:      bl      0x2010008 <__ARMV7PILongThunk_dest>
  30 # CHECK-NEXT:                 b       0x4010008 <__ARMV7PILongThunk_dest>
  31 # CHECK-EMPTY:
  32 # CHECK-NEXT:  <__ARMV7PILongThunk_dest>:
  33 # CHECK-NEXT:   4010008:      movw    r12, #65516
  34 # CHECK-NEXT:                 movt    r12, #64511
  35 # CHECK-NEXT:                 add     r12, r12, pc
  36 # CHECK-NEXT:                 bx      r12
  37
  38 # CHECK-EB: Contents of section .text_low:
  39 # CHECK-EB-NEXT: 10000 e320f000 e12fff1e
  40 # CHECK-EB: Contents of section .text_mid:
  41 # CHECK-EB-NEXT: 2010004 eaffffff e30fcfec e34fcdff e08cc00f
  42 # CHECK-EB-NEXT: 2010014 e12fff1c
  43 # CHECK-EB: Contents of section .text_high:
  44 # CHECK-EB-NEXT: 4010000 eb800000 eaffffff e30fcfec e34fcbff
  45 # CHECK-EB-NEXT: 4010010 e08cc00f e12fff1c
  46
  47 # CHECK-LE: Contents of section .text_low:
  48 # CHECK-LE-NEXT: 10000 00f020e3 1eff2fe1
  49 # CHECK-LE: Contents of section .text_mid:
  50 # CHECK-LE-NEXT: 2010004 ffffffea eccf0fe3 ffcd4fe3 0fc08ce0
  51 # CHECK-LE-NEXT: 2010014 1cff2fe1
  52 # CHECK-LE: Contents of section .text_high:
  53 # CHECK-LE-NEXT: 4010000 000080eb ffffffea eccf0fe3 ffcb4fe3
  54 # CHECK-LE-NEXT: 4010010 0fc08ce0 1cff2fe1
  55
  56 #--- a.s
  57 .section .text_low, "ax", %progbits
  58
  59 .globl _start
  60 _start:
  61   nop
  62 dest:
  63   bx lr
  64
  65 .section .text_mid, "ax", %progbits
  66 mid:
  67   b dest
  68
  69 .section .text_high, "ax", %progbits
  70 high:
  71   bl dest
  72   b dest
  73
  74 #--- lds
  75 SECTIONS {
  76   .text_low 0x10000: { *(.text_low) }
  77   .text_mid 0x2010004 : { *(.text_mid) }
  78   .text_high 0x4010000 : { *(.text_high) }
  79 }