187 lines
5.0 KiB
C
187 lines
5.0 KiB
C
/* $NetBSD: uvm_unix.c,v 1.38 2007/02/09 21:55:43 ad Exp $ */
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/*
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* Copyright (c) 1997 Charles D. Cranor and Washington University.
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* Copyright (c) 1991, 1993 The Regents of the University of California.
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* Copyright (c) 1988 University of Utah.
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*
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles D. Cranor,
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* Washington University, the University of California, Berkeley and
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* its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
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* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
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* from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
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*/
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/*
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* uvm_unix.c: traditional sbrk/grow interface to vm.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: uvm_unix.c,v 1.38 2007/02/09 21:55:43 ad Exp $");
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#include "opt_pax.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/mount.h>
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#include <sys/syscallargs.h>
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#ifdef PAX_MPROTECT
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#include <sys/pax.h>
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#endif /* PAX_MPROTECT */
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#include <uvm/uvm.h>
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/*
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* sys_obreak: set break
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*/
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int
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sys_obreak(struct lwp *l, void *v, register_t *retval)
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{
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struct sys_obreak_args /* {
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syscallarg(char *) nsize;
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} */ *uap = v;
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struct proc *p = l->l_proc;
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struct vmspace *vm = p->p_vmspace;
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vaddr_t new, old;
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int error;
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old = (vaddr_t)vm->vm_daddr;
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new = round_page((vaddr_t)SCARG(uap, nsize));
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if ((new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur && new > old)
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return (ENOMEM);
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old = round_page(old + ptoa(vm->vm_dsize));
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if (new == old)
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return (0);
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/*
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* grow or shrink?
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*/
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if (new > old) {
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vm_prot_t prot = UVM_PROT_READ | UVM_PROT_WRITE;
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vm_prot_t maxprot = UVM_PROT_ALL;
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#ifdef PAX_MPROTECT
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pax_mprotect(l, &prot, &maxprot);
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#endif /* PAX_MPROTECT */
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error = uvm_map(&vm->vm_map, &old, new - old, NULL,
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UVM_UNKNOWN_OFFSET, 0,
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UVM_MAPFLAG(prot, maxprot,
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UVM_INH_COPY,
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UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
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UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW));
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if (error) {
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uprintf("sbrk: grow %ld failed, error = %d\n",
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new - old, error);
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return (error);
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}
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vm->vm_dsize += atop(new - old);
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} else {
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uvm_deallocate(&vm->vm_map, new, old - new);
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vm->vm_dsize -= atop(old - new);
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}
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return (0);
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}
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/*
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* uvm_grow: enlarge the "stack segment" to include sp.
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*/
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int
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uvm_grow(struct proc *p, vaddr_t sp)
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{
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struct vmspace *vm = p->p_vmspace;
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vsize_t nss;
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/*
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* For user defined stacks (from sendsig).
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*/
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#ifdef __MACHINE_STACK_GROWS_UP
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if (sp < (vaddr_t)vm->vm_minsaddr)
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#else
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if (sp < (vaddr_t)vm->vm_maxsaddr)
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#endif
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return (0);
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/*
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* For common case of already allocated (from trap).
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*/
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#ifdef __MACHINE_STACK_GROWS_UP
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if (sp < USRSTACK + ctob(vm->vm_ssize))
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#else
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if (sp >= USRSTACK - ctob(vm->vm_ssize))
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#endif
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return (1);
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/*
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* Really need to check vs limit and increment stack size if ok.
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*/
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#ifdef __MACHINE_STACK_GROWS_UP
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nss = btoc(sp - USRSTACK);
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#else
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nss = btoc(USRSTACK - sp);
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#endif
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if (nss > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur))
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return (0);
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vm->vm_ssize = nss;
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return (1);
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}
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/*
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* sys_oadvise: old advice system call
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*/
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/* ARGSUSED */
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int
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sys_ovadvise(struct lwp *l, void *v, register_t *retval)
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{
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#if 0
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struct sys_ovadvise_args /* {
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syscallarg(int) anom;
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} */ *uap = v;
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#endif
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return (EINVAL);
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}
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