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        .globl  _sbrk
        .globl  __sbrk
_sbrk:
__sbrk:
        mov.w     tptr,r0
         test.w   [ap]
         je        justreport 
         add.w    r0,[ap]
         push     [ap]
         mov.w    ap,r3
         mov.w    sp,ap
         chlvl    #0x0,#0x11
         jnl     ok 
         add.w    #0x4,sp
         jmp      cerror
ok:      add.w    #0x4,sp
         mov.w    tptr,r0
         mov.w    [r3],tptr
justreport:
        ret       #0x0

        .globl  _brk
        .globl  __brk
__brk:
_brk:    chlvl    #0x0,#0x11
         jnl     ok1
         jmp     cerror 
ok1:     mov.w    [ap],63
         xor.w    r0,r0
         ret      #0x0
        
                .data
tptr:   .word   _end