133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1991 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 7.2 (Berkeley) 4/20/91
|
|
*/
|
|
|
|
/*
|
|
* Traditional sbrk/grow interface to VM
|
|
*/
|
|
#include "param.h"
|
|
#include "systm.h"
|
|
#include "proc.h"
|
|
#include "resourcevar.h"
|
|
|
|
#include "vm.h"
|
|
|
|
/* ARGSUSED */
|
|
obreak(p, uap, retval)
|
|
struct proc *p;
|
|
struct args {
|
|
char *nsiz;
|
|
} *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.
|
|
*/
|
|
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 >= (unsigned)vm->vm_maxsaddr + MAXSSIZ - ctob(vm->vm_ssize))
|
|
return (1);
|
|
/*
|
|
* Really need to check vs limit and increment stack size if ok.
|
|
*/
|
|
si = clrnd(btoc(vm->vm_maxsaddr + MAXSSIZ - 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);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
ovadvise(p, uap, retval)
|
|
struct proc *p;
|
|
struct args {
|
|
int anom;
|
|
} *uap;
|
|
int *retval;
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|