Home | History | Annotate | Download | only in testsuite
      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
     67