gold/testsuite/thumb_blx_out_of_range.s

   1 # thumb_blx_out_of_range.s
   2 # Test THUMB/THUMB-2 blx instructions just out of the branch range limits.
   3         .syntax unified
   4
   5         .section        .text.pre,"x"
   6
   7 # Add padding so that target is just output of branch range.
   8         .space  4
   9
  10         .global _forward_target
  11         .global _backward_target
  12         .type   _backword_target, %function
  13 _backward_target:
  14         bx      lr
  15         .size   _backward_target, .-_backward_target
  16
  17         .text
  18 # Use 256-byte alignment so that we know where the stubs start.
  19         .align  8
  20
  21 # Define _start so that linker does not complain.
  22         .align  2
  23         .global _start
  24         .code   32
  25         .type   _start, %function
  26 _start:
  27         bx      lr
  28         .size   _start, .-_start
  29
  30         .global _backward_test
  31         .code   16
  32         .thumb_func
  33         .type   _backward_test, %function
  34 _backward_test:
  35         bl      _backward_target
  36         .size   _backward_test, .-_backward_test
  37
  38         .align  2
  39         .global _forward_test
  40         .code   16
  41         .thumb_func
  42         .type   _forward_test, %function
  43 _forward_test:
  44         # Bit 1 of the BLX target comes from bit 1 of branch base address,
  45         # which is BLX instruction's address + 4.  We intentionally put this
  46         # forward BLX at an address n*4 + 2 so that the branch offset is
  47         # bumped up by 2.
  48         nop.n
  49         bl      _forward_target
  50         .size   _forward_test, .-_forward_test
  51
  52 # switch back to ARM mode so that stubs are disassembled correctly.
  53         .code   32
  54         nop
  55
  56         .section        .text.post,"x"
  57
  58 # Add padding so that target is just out of branch range.
  59         .space  12
  60         .align 2
  61         .code   32
  62         .global _forward_target
  63         .type   _forward_target, %function
  64 _forward_target:
  65         bx      lr
  66         .size   _forward_target, .-_forward_target