2 * Copyright (c) 1993 Jan-Simon Pendry
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6 * This code is derived from software contributed to Berkeley by
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37 * @(#)procfs_status.c 8.3 (Berkeley) 2/17/94
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_map.c,v 1.24.2.1 2001/08/04 13:12:24 rwatson Exp $
40 * $DragonFly: src/sys/vfs/procfs/procfs_map.c,v 1.2 2003/06/17 04:28:42 dillon Exp $
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/vnode.h>
47 #include <miscfs/procfs/procfs.h>
52 #include <vm/vm_map.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_object.h>
57 #define MEBUFFERSIZE 256
60 * The map entries can *almost* be read with programs like cat. However,
61 * large maps need special programs to read. It is not easy to implement
62 * a program that can sense the required size of the buffer, and then
63 * subsequently do a read with the appropriate size. This operation cannot
64 * be atomic. The best that we can do is to allow the program to do a read
65 * with an arbitrarily large buffer, and return as much as we can. We can
66 * return an error code if the buffer is too small (EFBIG), then the program
67 * can try a bigger buffer.
70 procfs_domap(curp, p, pfs, uio)
78 vm_map_t map = &p->p_vmspace->vm_map;
79 pmap_t pmap = vmspace_pmap(p->p_vmspace);
81 char mebuffer[MEBUFFERSIZE];
83 if (uio->uio_rw != UIO_READ)
86 if (uio->uio_offset != 0)
90 if (map != &curproc->p_vmspace->vm_map)
91 vm_map_lock_read(map);
92 for (entry = map->header.next;
93 ((uio->uio_resid > 0) && (entry != &map->header));
94 entry = entry->next) {
95 vm_object_t obj, tobj, lobj;
96 int ref_count, shadow_count, flags;
98 int resident, privateresident;
101 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP)
104 obj = entry->object.vm_object;
105 if (obj && (obj->shadow_count == 1))
106 privateresident = obj->resident_page_count;
112 while (addr < entry->end) {
113 if (pmap_extract( pmap, addr))
118 for( lobj = tobj = obj; tobj; tobj = tobj->backing_object)
140 ref_count = obj->ref_count;
141 shadow_count = obj->shadow_count;
152 * start, end, resident, private resident, cow, access, type.
154 snprintf(mebuffer, sizeof(mebuffer),
155 "0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s\n",
156 (u_long)entry->start, (u_long)entry->end,
157 resident, privateresident, obj,
158 (entry->protection & VM_PROT_READ)?"r":"-",
159 (entry->protection & VM_PROT_WRITE)?"w":"-",
160 (entry->protection & VM_PROT_EXECUTE)?"x":"-",
161 ref_count, shadow_count, flags,
162 (entry->eflags & MAP_ENTRY_COW)?"COW":"NCOW",
163 (entry->eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC",
166 len = strlen(mebuffer);
167 if (len > uio->uio_resid) {
171 error = uiomove(mebuffer, len, uio);
175 if (map != &curproc->p_vmspace->vm_map)
176 vm_map_unlock_read(map);
185 return ((p->p_flag & P_SYSTEM) == 0);