2 * Copyright (c) 1993 Jan-Simon Pendry
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
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33 * @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
35 * $FreeBSD: src/sys/miscfs/procfs/procfs_map.c,v 1.24.2.1 2001/08/04 13:12:24 rwatson Exp $
36 * $DragonFly: src/sys/vfs/procfs/procfs_map.c,v 1.7 2007/02/19 01:14:24 corecode Exp $
39 #include <sys/param.h>
40 #include <sys/systm.h>
42 #include <sys/vnode.h>
43 #include <vfs/procfs/procfs.h>
48 #include <vm/vm_map.h>
49 #include <vm/vm_page.h>
50 #include <vm/vm_object.h>
53 #define MEBUFFERSIZE 256
56 * The map entries can *almost* be read with programs like cat. However,
57 * large maps need special programs to read. It is not easy to implement
58 * a program that can sense the required size of the buffer, and then
59 * subsequently do a read with the appropriate size. This operation cannot
60 * be atomic. The best that we can do is to allow the program to do a read
61 * with an arbitrarily large buffer, and return as much as we can. We can
62 * return an error code if the buffer is too small (EFBIG), then the program
63 * can try a bigger buffer.
66 procfs_domap(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
69 struct proc *p = lp->lwp_proc;
72 char *fullpath, *freepath;
74 vm_map_t map = &p->p_vmspace->vm_map;
75 pmap_t pmap = vmspace_pmap(p->p_vmspace);
77 char mebuffer[MEBUFFERSIZE];
79 if (uio->uio_rw != UIO_READ)
82 if (uio->uio_offset != 0)
86 vm_map_lock_read(map);
87 for (entry = map->header.next;
88 ((uio->uio_resid > 0) && (entry != &map->header));
89 entry = entry->next) {
90 vm_object_t obj, tobj, lobj;
91 int ref_count, shadow_count, flags;
94 int resident, privateresident;
97 if (entry->maptype != VM_MAPTYPE_NORMAL &&
98 entry->maptype != VM_MAPTYPE_VPAGETABLE) {
102 obj = entry->object.vm_object;
103 if (obj && (obj->shadow_count == 1))
104 privateresident = obj->resident_page_count;
109 * Use map->hint as a poor man's ripout detector.
112 ostart = entry->start;
115 * Count resident pages (XXX can be horrible on 64-bit)
119 while (addr < entry->end) {
120 if (pmap_extract( pmap, addr))
125 for( lobj = tobj = obj; tobj; tobj = tobj->backing_object)
153 ref_count = obj->ref_count;
154 shadow_count = obj->shadow_count;
156 vn_fullpath(p, vp, &fullpath, &freepath, 1);
168 * start, end, res, priv res, cow, access, type, (fullpath).
170 ksnprintf(mebuffer, sizeof(mebuffer),
171 "0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s %s\n",
172 (u_long)entry->start, (u_long)entry->end,
173 resident, privateresident, obj,
174 (entry->protection & VM_PROT_READ)?"r":"-",
175 (entry->protection & VM_PROT_WRITE)?"w":"-",
176 (entry->protection & VM_PROT_EXECUTE)?"x":"-",
177 ref_count, shadow_count, flags,
178 (entry->eflags & MAP_ENTRY_COW)?"COW":"NCOW",
179 (entry->eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
182 if (freepath != NULL) {
183 kfree(freepath, M_TEMP);
187 len = strlen(mebuffer);
188 if (len > uio->uio_resid) {
194 * We cannot safely hold the map locked while accessing
195 * userspace as a VM fault might recurse the locked map.
197 vm_map_unlock_read(map);
198 error = uiomove(mebuffer, len, uio);
199 vm_map_lock_read(map);
204 * We use map->hint as a poor man's ripout detector. If
205 * it does not match the entry we set it to prior to
206 * unlocking the map the entry MIGHT now be stale. In
207 * this case we do an expensive lookup to find our place
208 * in the iteration again.
210 if (map->hint != entry) {
211 vm_map_entry_t reentry;
213 vm_map_lookup_entry(map, ostart, &reentry);
217 vm_map_unlock_read(map);
223 procfs_validmap(struct lwp *lp)
225 return ((lp->lwp_proc->p_flag & P_SYSTEM) == 0);