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The exec_target binary could segfault calling _exit(2) because r13 is not set up properly (and libc looks at that when performing a syscall). Call SYS_exit using syscall(2) which doesn't seem to have this problem. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>