386BSD 0.1 development

Work on file usr/src/sys.386bsd/vm/vm_unix.c

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.1

diff --git a/usr/src/sys.386bsd/vm/vm_unix.c b/usr/src/sys.386bsd/vm/vm_unix.c
new file mode 100644 (file)
index 0000000..0a9d97c
--- /dev/null
+++ b/usr/src/sys.386bsd/vm/vm_unix.c
@@ -0,0 +1,132 @@
+/*
+ * 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);
+}