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Diffstat (limited to 'sys/fs/procfs/procfs_map.c')
| -rw-r--r-- | sys/fs/procfs/procfs_map.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sys/fs/procfs/procfs_map.c b/sys/fs/procfs/procfs_map.c new file mode 100644 index 0000000..c6b8966 --- /dev/null +++ b/sys/fs/procfs/procfs_map.c @@ -0,0 +1,185 @@ +/* + * Copyright (c) 1993 Jan-Simon Pendry + * Copyright (c) 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Jan-Simon Pendry. + * + * 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. + * + * @(#)procfs_status.c 8.3 (Berkeley) 2/17/94 + * + * $Id: procfs_map.c,v 1.18 1998/12/04 22:54:51 archie Exp $ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/proc.h> +#include <sys/vnode.h> +#include <miscfs/procfs/procfs.h> + +#include <vm/vm.h> +#include <vm/vm_prot.h> +#include <sys/lock.h> +#include <vm/pmap.h> +#include <vm/vm_map.h> +#include <vm/vm_page.h> +#include <vm/vm_object.h> + + +#define MEBUFFERSIZE 256 + +/* + * The map entries can *almost* be read with programs like cat. However, + * large maps need special programs to read. It is not easy to implement + * a program that can sense the required size of the buffer, and then + * subsequently do a read with the appropriate size. This operation cannot + * be atomic. The best that we can do is to allow the program to do a read + * with an arbitrarily large buffer, and return as much as we can. We can + * return an error code if the buffer is too small (EFBIG), then the program + * can try a bigger buffer. + */ +int +procfs_domap(curp, p, pfs, uio) + struct proc *curp; + struct proc *p; + struct pfsnode *pfs; + struct uio *uio; +{ + int len; + int error; + vm_map_t map = &p->p_vmspace->vm_map; + pmap_t pmap = &p->p_vmspace->vm_pmap; + vm_map_entry_t entry; + char mebuffer[MEBUFFERSIZE]; + + if (uio->uio_rw != UIO_READ) + return (EOPNOTSUPP); + + if (uio->uio_offset != 0) + return (0); + + error = 0; + if (map != &curproc->p_vmspace->vm_map) + vm_map_lock_read(map); + for (entry = map->header.next; + ((uio->uio_resid > 0) && (entry != &map->header)); + entry = entry->next) { + vm_object_t obj, tobj, lobj; + int ref_count, shadow_count, flags; + vm_offset_t addr; + int resident, privateresident; + char *type; + + if (entry->eflags & (MAP_ENTRY_IS_A_MAP|MAP_ENTRY_IS_SUB_MAP)) + continue; + + obj = entry->object.vm_object; + if (obj && (obj->shadow_count == 1)) + privateresident = obj->resident_page_count; + else + privateresident = 0; + + resident = 0; + addr = entry->start; + while (addr < entry->end) { + if (pmap_extract( pmap, addr)) + resident++; + addr += PAGE_SIZE; + } + + for( lobj = tobj = obj; tobj; tobj = tobj->backing_object) + lobj = tobj; + + if (lobj) { + switch(lobj->type) { + +default: +case OBJT_DEFAULT: + type = "default"; + break; +case OBJT_VNODE: + type = "vnode"; + break; +case OBJT_SWAP: + type = "swap"; + break; +case OBJT_DEVICE: + type = "device"; + break; + } + + flags = obj->flags; + ref_count = obj->ref_count; + shadow_count = obj->shadow_count; + } else { + type = "none"; + flags = 0; + ref_count = 0; + shadow_count = 0; + } + + + /* + * format: + * start, end, resident, private resident, cow, access, type. + */ + snprintf(mebuffer, sizeof(mebuffer), + "0x%x 0x%x %d %d %p %s%s%s %d %d 0x%x %s %s %s\n", + entry->start, entry->end, + resident, privateresident, obj, + (entry->protection & VM_PROT_READ)?"r":"-", + (entry->protection & VM_PROT_WRITE)?"w":"-", + (entry->protection & VM_PROT_EXECUTE)?"x":"-", + ref_count, shadow_count, flags, + (entry->eflags & MAP_ENTRY_COW)?"COW":"NCOW", + (entry->eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC", + type); + + len = strlen(mebuffer); + if (len > uio->uio_resid) { + error = EFBIG; + break; + } + error = uiomove(mebuffer, len, uio); + if (error) + break; + } + if (map != &curproc->p_vmspace->vm_map) + vm_map_unlock_read(map); + return error; +} + +int +procfs_validmap(p) + struct proc *p; +{ + return ((p->p_flag & P_SYSTEM) == 0); +} |
