_cerrno.s - scc - simple c99 compiler
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       ---
       _cerrno.s (133B)
       ---
            1         .file        "_cerrno.s"
            2         .globl        _cerrno
            3 
            4 _cerrno:
            5         cmp        r0,#0
            6         blt        1f
            7         bx        lr
            8 
            9 1:
           10         neg        r0,r0
           11         ldr        r1,=errno
           12         str        r0,[r1]
           13         mov        r0,#-1
           14         bx        lr