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.global __alloca

__alloca:

        pushl   %ecx            /* save temp */

        leal    8(%esp), %ecx   /* point past return addr */

        subl    %eax, %ecx

        cmpl    %fs:4, %ecx     # check low stack limit

        jb      1f

        movl    %ecx, %esp      /* decrement stack */

        movl    (%eax), %ecx    /* recover saved temp */

        movl    4(%eax), %eax   /* recover return address */

           jumping to %eax preserves the cached call-return stack

           used by most modern processors.  */

        pushl   %eax

        ret

1:

        int3                    #trap to debugger

        .ascii "Stack overflow"