1 # thumb_blx_in_range.s 2 # 3 # Test THUMB/THUMB-2 blx instructions just within the branch range limits. 4 # Because bit 1 of the branch target comes from the branch instruction 5 # address, the branch range from PC (branch instruction address + 4) is 6 # acutally -((1<<22) + 2) to ((1<<22) - 4) for THUMB and -((1<<24) + 2) to 7 # ((1<<24) - 4) from THUMB2. 8 9 .syntax unified 10 .section .text.pre,"x" 11 12 # Add padding so that target is just in branch range. 13 .space 8 14 15 .align 2 16 .global _backward_target 17 .code 32 18 .type _backword_target, %function 19 _backward_target: 20 bx lr 21 .size _backward_target, .-_backward_target 22 23 .text 24 25 # Define _start so that linker does not complain. 26 .global _start 27 .code 32 28 .align 2 29 .type _start, %function 30 _start: 31 bx lr 32 .size _start, .-_start 33 34 .global _backward_test 35 .code 16 36 .thumb_func 37 .type _backward_test, %function 38 _backward_test: 39 nop.n 40 blx _backward_target 41 .size _backward_test, .-_backward_test 42 43 .align 2 44 .global _forward_test 45 .code 16 46 .thumb_func 47 .type _forward_test, %function 48 _forward_test: 49 blx _forward_target 50 .size _forward_test, .-_forward_test 51 .code 32 52 53 .section .text.post,"x" 54 55 # Add padding so that target is just in branch range. 56 .space 12 57 58 .align 2 59 .global _forward_target 60 .code 32 61 .type _forward_target, %function 62 _forward_target: 63 bx lr 64 .size _forward_target, .-_forward_target 65
