lld/test/ELF/arm-thumb-thunk-v6m-xo.s

   1 // REQUIRES: arm
   2 // This test intentionally checks for fatal errors, and fatal errors aren't supported for testing when main is run twice.
   3 // XFAIL: main-run-twice
   4 // RUN: rm -rf %t && split-file %s %t
   5 // RUN: llvm-mc -arm-add-build-attributes -filetype=obj -triple=armv6m-none-eabi %t/a.s -o %t/a.o
   6 // RUN: ld.lld --no-rosegment --script %t/a.t %t/a.o -o %t/a
   7 // RUN: llvm-objdump --no-print-imm-hex --no-show-raw-insn -d %t/a --triple=armv6m-none-eabi | FileCheck %s
   8 // RUN: not ld.lld --no-rosegment --script %t/a.t %t/a.o -o %t/a2 --pie 2>&1 | FileCheck --check-prefix=CHECK-PI %s
   9 // RUN: rm -f %t/a %t/a2
  10
  11 // Range extension thunks for Arm Architecture v6m. Only Thumb instructions
  12 // are permitted which limits the access to instructions that can access the
  13 // high registers (r8 - r15), this means that the thunks have to spill
  14 // low registers (r0 - r7) in order to perform the transfer of control.
  15
  16 //--- a.t
  17 SECTIONS {
  18   .text_low  0x11345670 : { *(.text_low) }
  19   .text_high 0x12345678 : { *(.text_high) }
  20 }
  21
  22 //--- a.s
  23 // The 'y' on the .section directive  means that this section is eXecute Only code
  24  .syntax unified
  25  .section .text_low, "axy", %progbits
  26  .thumb
  27  .type _start, %function
  28  .balign 4
  29  .globl _start
  30 _start:
  31  bl far
  32
  33  .section .text_high, "ax", %progbits
  34  .globl far
  35  .type far, %function
  36 far:
  37  bx lr
  38
  39 // CHECK: Disassembly of section .text_low:
  40 // CHECK-EMPTY:
  41 // CHECK-NEXT: <_start>:
  42 // CHECK-NEXT: 11345670:        bl      0x11345674 <__Thumbv6MABSXOLongThunk_far>
  43 // CHECK: <__Thumbv6MABSXOLongThunk_far>:
  44 // CHECK-NEXT:                  push    {r0, r1}
  45 // CHECK-NEXT:                  movs    r0, #18
  46 // CHECK-NEXT:                  lsls    r0, r0, #8
  47 // CHECK-NEXT:                  adds    r0, #52
  48 // CHECK-NEXT:                  lsls    r0, r0, #8
  49 // CHECK-NEXT:                  adds    r0, #86
  50 // CHECK-NEXT:                  lsls    r0, r0, #8
  51 // CHECK-NEXT:                  adds    r0, #121
  52 // CHECK-NEXT:                  str     r0, [sp, #4]
  53 // CHECK-NEXT:                  pop     {r0, pc}
  54 // CHECK: Disassembly of section .text_high:
  55 // CHECK-EMPTY:
  56 // CHECK-NEXT: <far>:
  57 // CHECK-NEXT: 12345678:        bx      lr
  58
  59 // CHECK-PI:  error: relocation R_ARM_THM_CALL to far not supported for Armv6-M targets for position independent and execute only code