Return to sbrk.s CVS log

Up to [Research Unix] / researchv9 / libc / sys

Annotation of researchv9/libc/sys/sbrk.s, revision 1.1

1.1     ! root        1: #old = sbrk(increment);
        !             2: #
        !             3: #sbrk gets increment more core, and returns a pointer
        !             4: #      to the beginning of the new core area
        !             5: #
        !             6:        break = 17
        !             7: .globl _sbrk
        !             8: .globl _end
        !             9: .globl  cerror
        !            10: 
        !            11: _sbrk:
        !            12:        addql   #3,sp@(4)
        !            13:        andl    #0xfffffffc,sp@(4)
        !            14:        movl    nd,d0
        !            15:        addl    sp@(4),d0
        !            16:        movl    d0,sp@-
        !            17:        jsr     1f
        !            18:        bcc     noerr1
        !            19:        addql   #4,sp
        !            20:        jmp     cerror2
        !            21: noerr1:
        !            22:        addql   #4,sp
        !            23:        movl    nd,d0
        !            24:        movl    sp@(4),d1
        !            25:        addl    d1,nd
        !            26:        movl    d0,a0
        !            27:        rts
        !            28: 1:
        !            29:        pea     break
        !            30:        trap    #0
        !            31:        rts
        !            32: 
        !            33: .globl _brk
        !            34: # brk(value)
        !            35: # as described in man2.
        !            36: # returns 0 for ok, -1 for error.
        !            37: 
        !            38: _brk:
        !            39:        pea     break
        !            40:        trap    #0
        !            41:        bcc     noerr2
        !            42:        jmp     cerror2
        !            43: noerr2:
        !            44:        movl    sp@(4),nd
        !            45:        clrl    d0
        !            46:        lea     0,a0
        !            47:        rts
        !            48: 
        !            49:        .data
        !            50: nd:    .long   _end

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.