procfs_map.c revision 118907
1/* 2 * Copyright (c) 1993 Jan-Simon Pendry 3 * Copyright (c) 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Jan-Simon Pendry. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)procfs_status.c 8.3 (Berkeley) 2/17/94 38 * 39 * $FreeBSD: head/sys/fs/procfs/procfs_map.c 118907 2003-08-14 15:26:44Z rwatson $ 40 */ 41 42#include <sys/param.h> 43#include <sys/systm.h> 44#include <sys/lock.h> 45#include <sys/mutex.h> 46#include <sys/proc.h> 47#include <sys/uio.h> 48 49#include <fs/pseudofs/pseudofs.h> 50#include <fs/procfs/procfs.h> 51 52#include <vm/vm.h> 53#include <vm/pmap.h> 54#include <vm/vm_map.h> 55#include <vm/vm_page.h> 56#include <vm/vm_object.h> 57 58 59#define MEBUFFERSIZE 256 60 61/* 62 * The map entries can *almost* be read with programs like cat. However, 63 * large maps need special programs to read. It is not easy to implement 64 * a program that can sense the required size of the buffer, and then 65 * subsequently do a read with the appropriate size. This operation cannot 66 * be atomic. The best that we can do is to allow the program to do a read 67 * with an arbitrarily large buffer, and return as much as we can. We can 68 * return an error code if the buffer is too small (EFBIG), then the program 69 * can try a bigger buffer. 70 */ 71int 72procfs_doprocmap(PFS_FILL_ARGS) 73{ 74 int len; 75 int error; 76 vm_map_t map = &p->p_vmspace->vm_map; 77 pmap_t pmap = vmspace_pmap(p->p_vmspace); 78 vm_map_entry_t entry; 79 char mebuffer[MEBUFFERSIZE]; 80 81 GIANT_REQUIRED; 82 83 PROC_LOCK(p); 84 error = p_candebug(td, p); 85 PROC_UNLOCK(p); 86 if (error) 87 return (error); 88 89 if (uio->uio_rw != UIO_READ) 90 return (EOPNOTSUPP); 91 92 if (uio->uio_offset != 0) 93 return (0); 94 95 error = 0; 96 if (map != &curthread->td_proc->p_vmspace->vm_map) 97 vm_map_lock_read(map); 98 for (entry = map->header.next; 99 ((uio->uio_resid > 0) && (entry != &map->header)); 100 entry = entry->next) { 101 vm_object_t obj, tobj, lobj; 102 int ref_count, shadow_count, flags; 103 vm_offset_t addr; 104 int resident, privateresident; 105 char *type; 106 107 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) 108 continue; 109 110 obj = entry->object.vm_object; 111 if (obj && (obj->shadow_count == 1)) 112 privateresident = obj->resident_page_count; 113 else 114 privateresident = 0; 115 116 resident = 0; 117 addr = entry->start; 118 while (addr < entry->end) { 119 if (pmap_extract( pmap, addr)) 120 resident++; 121 addr += PAGE_SIZE; 122 } 123 124 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) 125 lobj = tobj; 126 127 if (lobj) { 128 switch(lobj->type) { 129 default: 130 case OBJT_DEFAULT: 131 type = "default"; 132 break; 133 case OBJT_VNODE: 134 type = "vnode"; 135 break; 136 case OBJT_SWAP: 137 type = "swap"; 138 break; 139 case OBJT_DEVICE: 140 type = "device"; 141 break; 142 } 143 144 flags = obj->flags; 145 ref_count = obj->ref_count; 146 shadow_count = obj->shadow_count; 147 } else { 148 type = "none"; 149 flags = 0; 150 ref_count = 0; 151 shadow_count = 0; 152 } 153 154 /* 155 * format: 156 * start, end, resident, private resident, cow, access, type. 157 */ 158 snprintf(mebuffer, sizeof mebuffer, 159 "0x%lx 0x%lx %d %d %p %s%s%s %d %d 0x%x %s %s %s\n", 160 (u_long)entry->start, (u_long)entry->end, 161 resident, privateresident, obj, 162 (entry->protection & VM_PROT_READ)?"r":"-", 163 (entry->protection & VM_PROT_WRITE)?"w":"-", 164 (entry->protection & VM_PROT_EXECUTE)?"x":"-", 165 ref_count, shadow_count, flags, 166 (entry->eflags & MAP_ENTRY_COW)?"COW":"NCOW", 167 (entry->eflags & MAP_ENTRY_NEEDS_COPY)?"NC":"NNC", 168 type); 169 170 len = strlen(mebuffer); 171 if (len > uio->uio_resid) { 172 error = EFBIG; 173 break; 174 } 175 error = uiomove(mebuffer, len, uio); 176 if (error) 177 break; 178 } 179 if (map != &curthread->td_proc->p_vmspace->vm_map) 180 vm_map_unlock_read(map); 181 182 return (error); 183} 184