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mov r0, sp
; microsoft device emulator v3 has a broken BLX LR instruction.
; detect the bug here so we can work around it in the jit.
; the buggy blx-lr is a no-op, so this code returns 0 on working
; hardware, and 1 on the broken emulator.
mov r0, #1
add lr, pc, #4 ; addr of blx_lr_helper
mov r0, #0