diff options
Diffstat (limited to 'sys/vm/vm_unix.c')
| -rw-r--r-- | sys/vm/vm_unix.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/sys/vm/vm_unix.c b/sys/vm/vm_unix.c new file mode 100644 index 0000000..3d49ea7 --- /dev/null +++ b/sys/vm/vm_unix.c @@ -0,0 +1,137 @@ +/* + * Copyright (c) 1988 University of Utah. + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * the Systems Programming Group of the University of Utah Computer + * Science Department. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ + * + * @(#)vm_unix.c 8.1 (Berkeley) 6/11/93 + */ + +/* + * Traditional sbrk/grow interface to VM + */ +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/proc.h> +#include <sys/resourcevar.h> + +#include <vm/vm.h> + +struct obreak_args { + char *nsiz; +}; +/* ARGSUSED */ +int +obreak(p, uap, retval) + struct proc *p; + struct obreak_args *uap; + int *retval; +{ + register struct vmspace *vm = p->p_vmspace; + vm_offset_t new, old; + int rv; + register int diff; + + old = (vm_offset_t)vm->vm_daddr; + new = round_page(uap->nsiz); + if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur) + return(ENOMEM); + old = round_page(old + ctob(vm->vm_dsize)); + diff = new - old; + if (diff > 0) { + rv = vm_allocate(&vm->vm_map, &old, diff, FALSE); + if (rv != KERN_SUCCESS) { + uprintf("sbrk: grow failed, return = %d\n", rv); + return(ENOMEM); + } + vm->vm_dsize += btoc(diff); + } else if (diff < 0) { + diff = -diff; + rv = vm_deallocate(&vm->vm_map, new, diff); + if (rv != KERN_SUCCESS) { + uprintf("sbrk: shrink failed, return = %d\n", rv); + return(ENOMEM); + } + vm->vm_dsize -= btoc(diff); + } + return(0); +} + +/* + * Enlarge the "stack segment" to include the specified + * stack pointer for the process. + */ +int +grow(p, sp) + struct proc *p; + unsigned sp; +{ + register struct vmspace *vm = p->p_vmspace; + register int si; + + /* + * For user defined stacks (from sendsig). + */ + if (sp < (unsigned)vm->vm_maxsaddr) + return (0); + /* + * For common case of already allocated (from trap). + */ + if (sp >= USRSTACK - ctob(vm->vm_ssize)) + return (1); + /* + * Really need to check vs limit and increment stack size if ok. + */ + si = clrnd(btoc(USRSTACK-sp) - vm->vm_ssize); + if (vm->vm_ssize + si > btoc(p->p_rlimit[RLIMIT_STACK].rlim_cur)) + return (0); + vm->vm_ssize += si; + return (1); +} + +struct ovadvise_args { + int anom; +}; +/* ARGSUSED */ +int +ovadvise(p, uap, retval) + struct proc *p; + struct ovadvise_args *uap; + int *retval; +{ + + return (EINVAL); +} |
