247 lines
6.6 KiB
C
247 lines
6.6 KiB
C
/*
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993 Sean Eric Fagan
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* Copyright (c) 1993
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* The Regents of the University of California. 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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* Jan-Simon Pendry and Sean Eric Fagan.
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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 the University of
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* California, Berkeley and 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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* @(#)procfs_mem.c 8.4 (Berkeley) 1/21/94
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*
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* $Id: procfs_mem.c,v 1.13 1995/12/11 04:56:31 dyson Exp $
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*/
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/*
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* This is a lightly hacked and merged version
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* of sef's pread/pwrite functions
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <miscfs/procfs/procfs.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <vm/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_extern.h>
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static int procfs_rwmem __P((struct proc *p, struct uio *uio));
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static int
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procfs_rwmem(p, uio)
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struct proc *p;
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struct uio *uio;
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{
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int error;
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int writing;
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writing = uio->uio_rw == UIO_WRITE;
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/*
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* Only map in one page at a time. We don't have to, but it
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* makes things easier. This way is trivial - right?
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*/
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do {
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vm_map_t map, tmap;
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vm_object_t object;
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vm_offset_t kva = 0;
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vm_offset_t uva;
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int page_offset; /* offset into page */
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vm_offset_t pageno; /* page number */
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vm_map_entry_t out_entry;
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vm_prot_t out_prot;
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vm_page_t m;
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boolean_t wired, single_use;
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vm_pindex_t pindex;
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u_int len;
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int fix_prot;
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uva = (vm_offset_t) uio->uio_offset;
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if (uva >= VM_MAXUSER_ADDRESS) {
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if (writing || (uva >= (VM_MAXUSER_ADDRESS + UPAGES * PAGE_SIZE))) {
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error = 0;
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break;
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}
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}
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/*
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* Get the page number of this segment.
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*/
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pageno = trunc_page(uva);
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page_offset = uva - pageno;
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/*
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* How many bytes to copy
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*/
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len = min(PAGE_SIZE - page_offset, uio->uio_resid);
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/*
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* The map we want...
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*/
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map = &p->p_vmspace->vm_map;
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/*
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* Check the permissions for the area we're interested
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* in.
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*/
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fix_prot = 0;
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if (writing)
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fix_prot = !vm_map_check_protection(map, pageno,
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pageno + PAGE_SIZE, VM_PROT_WRITE);
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if (fix_prot) {
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/*
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* If the page is not writable, we make it so.
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* XXX It is possible that a page may *not* be
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* read/executable, if a process changes that!
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* We will assume, for now, that a page is either
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* VM_PROT_ALL, or VM_PROT_READ|VM_PROT_EXECUTE.
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*/
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error = vm_map_protect(map, pageno,
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pageno + PAGE_SIZE, VM_PROT_ALL, 0);
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if (error)
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break;
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}
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/*
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* Now we need to get the page. out_entry, out_prot, wired,
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* and single_use aren't used. One would think the vm code
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* would be a *bit* nicer... We use tmap because
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* vm_map_lookup() can change the map argument.
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*/
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tmap = map;
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error = vm_map_lookup(&tmap, pageno,
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writing ? VM_PROT_WRITE : VM_PROT_READ,
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&out_entry, &object, &pindex, &out_prot,
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&wired, &single_use);
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/*
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* We're done with tmap now.
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*/
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if (!error)
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vm_map_lookup_done(tmap, out_entry);
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/*
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* Fault the page in...
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*/
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if (!error && writing && object->backing_object) {
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m = vm_page_lookup(object, pindex);
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if (m == 0)
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error = vm_fault(map, pageno,
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VM_PROT_WRITE, FALSE);
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}
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/* Find space in kernel_map for the page we're interested in */
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if (!error)
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error = vm_map_find(kernel_map, object,
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IDX_TO_OFF(pindex), &kva, PAGE_SIZE, 1);
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if (!error) {
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/*
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* Neither vm_map_lookup() nor vm_map_find() appear
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* to add a reference count to the object, so we do
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* that here and now.
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*/
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vm_object_reference(object);
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/*
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* Mark the page we just found as pageable.
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*/
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error = vm_map_pageable(kernel_map, kva,
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kva + PAGE_SIZE, 0);
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/*
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* Now do the i/o move.
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*/
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if (!error)
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error = uiomove((caddr_t)(kva + page_offset),
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len, uio);
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vm_map_remove(kernel_map, kva, kva + PAGE_SIZE);
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}
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if (fix_prot)
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vm_map_protect(map, pageno, pageno + PAGE_SIZE,
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VM_PROT_READ|VM_PROT_EXECUTE, 0);
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} while (error == 0 && uio->uio_resid > 0);
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return (error);
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}
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/*
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* Copy data in and out of the target process.
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* We do this by mapping the process's page into
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* the kernel and then doing a uiomove direct
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* from the kernel address space.
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*/
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int
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procfs_domem(curp, p, pfs, uio)
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struct proc *curp;
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struct proc *p;
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struct pfsnode *pfs;
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struct uio *uio;
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{
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int error;
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if (uio->uio_resid == 0)
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return (0);
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error = procfs_rwmem(p, uio);
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return (error);
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}
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/*
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* Given process (p), find the vnode from which
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* it's text segment is being executed.
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*
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* It would be nice to grab this information from
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* the VM system, however, there is no sure-fire
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* way of doing that. Instead, fork(), exec() and
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* wait() all maintain the p_textvp field in the
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* process proc structure which contains a held
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* reference to the exec'ed vnode.
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*/
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struct vnode *
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procfs_findtextvp(p)
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struct proc *p;
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{
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return (p->p_textvp);
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}
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