Import of uvm from NetBSD. Some local changes, some code disabled

1 files changed, 258 insertions, 0 deletions

diff --git a/sys/uvm/uvm_unix.c b/sys/uvm/uvm_unix.c
new file mode 100644
index 00000000000..ed1588491cc
--- /dev/null
+++ b/sys/uvm/uvm_unix.c
@@ -0,0 +1,258 @@
+/*	$NetBSD: uvm_unix.c,v 1.7 1998/10/11 23:18:21 chuck Exp $	*/
+
+/*
+ * XXXCDC: "ROUGH DRAFT" QUALITY UVM PRE-RELEASE FILE!   
+ *         >>>USE AT YOUR OWN RISK, WORK IS NOT FINISHED<<<
+ */
+/*
+ * Copyright (c) 1997 Charles D. Cranor and Washington University.
+ * Copyright (c) 1991, 1993 The Regents of the University of California.  
+ * Copyright (c) 1988 University of Utah.
+ *
+ * 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 Charles D. Cranor,
+ *	Washington University, 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
+ * from: Id: uvm_unix.c,v 1.1.2.2 1997/08/25 18:52:30 chuck Exp
+ */
+
+/*
+ * uvm_unix.c: traditional sbrk/grow interface to vm.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/vnode.h>
+#include <sys/core.h>
+
+#include <sys/mount.h>
+#include <sys/syscallargs.h>
+
+#include <vm/vm.h>
+#include <uvm/uvm.h>
+
+
+/*
+ * sys_obreak: set break
+ */
+
+int
+sys_obreak(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_obreak_args /* {
+		syscallarg(char *) nsize;
+	} */ *uap = v;
+	register struct vmspace *vm = p->p_vmspace;
+	vaddr_t new, old;
+	int rv;
+	register int diff;
+
+	old = (vaddr_t)vm->vm_daddr;
+	new = round_page(SCARG(uap, nsize));
+	if ((int)(new - old) > p->p_rlimit[RLIMIT_DATA].rlim_cur)
+		return(ENOMEM);
+
+	old = round_page(old + ctob(vm->vm_dsize));
+	diff = new - old;
+
+	/*
+	 * grow or shrink?
+	 */
+
+	if (diff > 0) {
+
+		rv = uvm_map(&vm->vm_map, &old, diff, NULL, UVM_UNKNOWN_OFFSET,
+		    UVM_MAPFLAG(UVM_PROT_ALL, UVM_PROT_ALL, UVM_INH_COPY,
+		    UVM_ADV_NORMAL, UVM_FLAG_AMAPPAD|UVM_FLAG_FIXED|
+		    UVM_FLAG_OVERLAY|UVM_FLAG_COPYONW)); 
+
+		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 = uvm_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);
+}
+
+/*
+ * uvm_grow: enlarge the "stack segment" to include sp.
+ */
+
+int
+uvm_grow(p, sp)
+	struct proc *p;
+	vaddr_t sp;
+{
+	register struct vmspace *vm = p->p_vmspace;
+	register int si;
+
+	/*
+	 * For user defined stacks (from sendsig).
+	 */
+	if (sp < (vaddr_t)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);
+}
+
+/*
+ * sys_oadvise: old advice system call
+ */
+
+/* ARGSUSED */
+int
+sys_ovadvise(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+#if 0
+	struct sys_ovadvise_args /* {
+		syscallarg(int) anom;
+	} */ *uap = v;
+#endif
+
+	return (EINVAL);
+}
+
+/*
+ * uvm_coredump: dump core!
+ */
+
+int
+uvm_coredump(p, vp, cred, chdr)
+	struct proc *p;
+	struct vnode *vp;
+	struct ucred *cred;
+	struct core *chdr;
+{
+	register struct vmspace *vm = p->p_vmspace;
+	register vm_map_t map = &vm->vm_map;
+	register vm_map_entry_t entry;
+	vaddr_t start, end;
+	struct coreseg cseg;
+	off_t offset;
+	int flag, error = 0;
+
+	offset = chdr->c_hdrsize + chdr->c_seghdrsize + chdr->c_cpusize;
+
+	for (entry = map->header.next; entry != &map->header;
+	    entry = entry->next) {
+
+		/* should never happen for a user process */
+		if (UVM_ET_ISSUBMAP(entry)) {
+			panic("uvm_coredump: user process with submap?");
+		}
+
+		if (!(entry->protection & VM_PROT_WRITE))
+			continue;
+
+		start = entry->start;
+		end = entry->end;
+
+		if (start >= VM_MAXUSER_ADDRESS)
+			continue;
+
+		if (end > VM_MAXUSER_ADDRESS)
+			end = VM_MAXUSER_ADDRESS;
+
+		if (start >= (vaddr_t)vm->vm_maxsaddr) {
+			flag = CORE_STACK;
+			start = trunc_page(USRSTACK - ctob(vm->vm_ssize));
+			if (start >= end)
+				continue;
+		} else
+			flag = CORE_DATA;
+
+		/*
+		 * Set up a new core file segment.
+		 */
+		CORE_SETMAGIC(cseg, CORESEGMAGIC, CORE_GETMID(*chdr), flag);
+		cseg.c_addr = start;
+		cseg.c_size = end - start;
+
+		error = vn_rdwr(UIO_WRITE, vp,
+		    (caddr_t)&cseg, chdr->c_seghdrsize,
+		    offset, UIO_SYSSPACE,
+		    IO_NODELOCKED|IO_UNIT, cred, NULL, p);
+		if (error)
+			break;
+
+		offset += chdr->c_seghdrsize;
+		error = vn_rdwr(UIO_WRITE, vp,
+		    (caddr_t)cseg.c_addr, (int)cseg.c_size,
+		    offset, UIO_USERSPACE,
+		    IO_NODELOCKED|IO_UNIT, cred, NULL, p);
+		if (error)
+			break;
+		
+		offset += cseg.c_size;
+		chdr->c_nseg++;
+	}
+
+	return (error);
+}
+