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Annotation of Net2/vm/vm_unix.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988 University of Utah.
        !             3:  * Copyright (c) 1991 The Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * This code is derived from software contributed to Berkeley by
        !             7:  * the Systems Programming Group of the University of Utah Computer
        !             8:  * Science Department.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. All advertising materials mentioning features or use of this software
        !            19:  *    must display the following acknowledgement:
        !            20:  *     This product includes software developed by the University of
        !            21:  *     California, Berkeley and its contributors.
        !            22:  * 4. Neither the name of the University nor the names of its contributors
        !            23:  *    may be used to endorse or promote products derived from this software
        !            24:  *    without specific prior written permission.
        !            25:  *
        !            26:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            27:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            28:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            29:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            30:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            31:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            32:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            33:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            34:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            35:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            36:  * SUCH DAMAGE.
        !            37:  *
        !            38:  * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
        !            39:  *
        !            40:  *     @(#)vm_unix.c   7.2 (Berkeley) 4/20/91
        !            41:  */
        !            42: 
        !            43: /*
        !            44:  * Traditional sbrk/grow interface to VM
        !            45:  */
        !            46: #include "param.h"
        !            47: #include "systm.h"
        !            48: #include "proc.h"
        !            49: #include "resourcevar.h"
        !            50: 
        !            51: #include "vm.h"
        !            52: 
        !            53: /* ARGSUSED */
        !            54: obreak(p, uap, retval)
        !            55:        struct proc *p;
        !            56:        struct args {
        !            57:                char    *nsiz;
        !            58:        } *uap;
        !            59:        int *retval;
        !            60: {
        !            61:        register struct vmspace *vm = p->p_vmspace;
        !            62:        vm_offset_t new, old;
        !            63:        int rv;
        !            64:        register int diff;
        !            65: 
        !            66:        old = (vm_offset_t)vm->vm_daddr;
        !            67:        new = round_page(uap->nsiz);
        !            68:        if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
        !            69:                return(ENOMEM);
        !            70:        old = round_page(old + ctob(vm->vm_dsize));
        !            71:        diff = new - old;
        !            72:        if (diff > 0) {
        !            73:                rv = vm_allocate(&vm->vm_map, &old, diff, FALSE);
        !            74:                if (rv != KERN_SUCCESS) {
        !            75:                        uprintf("sbrk: grow failed, return = %d\n", rv);
        !            76:                        return(ENOMEM);
        !            77:                }
        !            78:                vm->vm_dsize += btoc(diff);
        !            79:        } else if (diff < 0) {
        !            80:                diff = -diff;
        !            81:                rv = vm_deallocate(&vm->vm_map, new, diff);
        !            82:                if (rv != KERN_SUCCESS) {
        !            83:                        uprintf("sbrk: shrink failed, return = %d\n", rv);
        !            84:                        return(ENOMEM);
        !            85:                }
        !            86:                vm->vm_dsize -= btoc(diff);
        !            87:        }
        !            88:        return(0);
        !            89: }
        !            90: 
        !            91: /*
        !            92:  * Enlarge the "stack segment" to include the specified
        !            93:  * stack pointer for the process.
        !            94:  */
        !            95: grow(p, sp)
        !            96:        struct proc *p;
        !            97:        unsigned sp;
        !            98: {
        !            99:        register struct vmspace *vm = p->p_vmspace;
        !           100:        register int si;
        !           101: 
        !           102:        /*
        !           103:         * For user defined stacks (from sendsig).
        !           104:         */
        !           105:        if (sp < (unsigned)vm->vm_maxsaddr)
        !           106:                return (0);
        !           107:        /*
        !           108:         * For common case of already allocated (from trap).
        !           109:         */
        !           110:        if (sp >= USRSTACK - ctob(vm->vm_ssize))
        !           111:                return (1);
        !           112:        /*
        !           113:         * Really need to check vs limit and increment stack size if ok.
        !           114:         */
        !           115:        si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize);
        !           116:        if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
        !           117:                return (0);
        !           118:        vm->vm_ssize += si;
        !           119:        return (1);
        !           120: }
        !           121: 
        !           122: /* ARGSUSED */
        !           123: ovadvise(p, uap, retval)
        !           124:        struct proc *p;
        !           125:        struct args {
        !           126:                int     anom;
        !           127:        } *uap;
        !           128:        int *retval;
        !           129: {
        !           130: 
        !           131:        return (EINVAL);
        !           132: }

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