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Annotation of coherent/b/lib/libc/crt/i386/scount.s, revision 1.1

1.1     ! root        1: ////////
        !             2: / libc/crt/i386/scount.s
        !             3: / i386 C runtime library.
        !             4: / Profile call counter.
        !             5: ////////
        !             6: 
        !             7:        .globl  _scount
        !             8:        .globl  _fnclst
        !             9:        .globl  _mhdr
        !            10: 
        !            11: ////////
        !            12: / Profile count routine.
        !            13: / Called from the entry sequence of every function
        !            14: / compiled with the -VPROF profile option.
        !            15: / On entry:
        !            16: /      %ecx    pointer to 12 byte block in BSS
        !            17: / The block looks like this:
        !            18: /      .long   ?       ; vaddr_t pc
        !            19: /      .long   ?       ; long count
        !            20: /      .long   ?       ; struct m_flst * link into _fnclst
        !            21: /
        !            22: / C source (roughly; delete prolog and epilog, hack parameters):
        !            23: /      #include <mon.h>
        !            24: /
        !            25: /      void
        !            26: /      _scount(pc, flp)
        !            27: /      vaddr_t pc;                     /* actually passed in (%esp) */
        !            28: /      register struct m_flst  *flp;   /* actually passed in %ecx */
        !            29: /      {
        !            30: /              ++flp->m_data.m_ncalls;
        !            31: /              if ((vaddr_t)&pc < _mhdr.m_lowsp)
        !            32: /                      _mhdr.m_lowsp = (vaddr_t)&pc;
        !            33: /              if (flp->m_link == NULL) {
        !            34: /                      flp->m_link = _fnclst;
        !            35: /                      _fnclst = flp;
        !            36: /                      flp->m_data.m_addr = pc;
        !            37: /              }
        !            38: /      }
        !            39: ////////
        !            40: 
        !            41:        .text
        !            42: 
        !            43: _scount:
        !            44:        incl    4(%ecx)
        !            45:        cmpl    %esp, _mhdr+12
        !            46:        jae     .L2
        !            47:        movl    _mhdr+12, %esp
        !            48: .L2:
        !            49:        cmpl    8(%ecx), $0
        !            50:        jne     .L1
        !            51:        movl    %eax, _fnclst
        !            52:        movl    8(%ecx), %eax
        !            53:        movl    _fnclst, %ecx
        !            54:        movl    %eax, (%esp)
        !            55:        movl    (%ecx), %eax
        !            56: .L1:
        !            57:        ret
        !            58: 
        !            59: / end of libc/crt/i386/scount.s

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