1 /* 2 * Copyright (c) 2006 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/types.h> 36 #include <sys/systm.h> 37 #include <cpu/lwbuf.h> 38 #include <vm/vm_page.h> 39 #include <vm/vm_extern.h> 40 #include <assert.h> 41 42 #include <sys/stat.h> 43 #include <sys/mman.h> 44 45 /* 46 * A bcopy that works dring low level boot, before FP is working 47 */ 48 void 49 ovbcopy(const void *src, void *dst, size_t len) 50 { 51 bcopy(src, dst, len); 52 } 53 54 void 55 bcopyi(const void *src, void *dst, size_t len) 56 { 57 bcopy(src, dst, len); 58 } 59 60 int 61 copystr(const void *kfaddr, void *kdaddr, size_t len, size_t *lencopied) 62 { 63 size_t i; 64 65 for (i = 0; i < len; ++i) { 66 if ((((char *)kdaddr)[i] = ((const char *)kfaddr)[i]) == 0) { 67 if (lencopied) 68 *lencopied = i + 1; 69 return(0); 70 } 71 } 72 return (ENAMETOOLONG); 73 } 74 75 /* 76 * Copies a NUL-terminated string from user space to kernel space. 77 * The number of bytes copied, including the terminator, is returned in 78 * (*res). 79 * 80 * Returns 0 on success, EFAULT or ENAMETOOLONG on failure. 81 */ 82 int 83 copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *res) 84 { 85 int error; 86 size_t n; 87 const char *uptr = udaddr; 88 char *kptr = kaddr; 89 90 if (res) 91 *res = 0; 92 while (len) { 93 n = PAGE_SIZE - ((vm_offset_t)uptr & PAGE_MASK); 94 if (n > 32) 95 n = 32; 96 if (n > len) 97 n = len; 98 if ((error = copyin(uptr, kptr, n)) != 0) 99 return(error); 100 while (n) { 101 if (res) 102 ++*res; 103 if (*kptr == 0) 104 return(0); 105 ++kptr; 106 ++uptr; 107 --n; 108 --len; 109 } 110 111 } 112 return(ENAMETOOLONG); 113 } 114 115 /* 116 * Copy a binary buffer from user space to kernel space. 117 * 118 * NOTE: on a real system copyin/copyout are MP safe, but the current 119 * implementation on a vkernel is not so we get the mp lock. 120 * 121 * Returns 0 on success, EFAULT on failure. 122 */ 123 int 124 copyin(const void *udaddr, void *kaddr, size_t len) 125 { 126 struct vmspace *vm = curproc->p_vmspace; 127 struct lwbuf *lwb; 128 vm_page_t m; 129 int error; 130 size_t n; 131 132 error = 0; 133 while (len) { 134 m = vm_fault_page(&vm->vm_map, trunc_page((vm_offset_t)udaddr), 135 VM_PROT_READ, 136 VM_FAULT_NORMAL, &error); 137 if (error) 138 break; 139 n = PAGE_SIZE - ((vm_offset_t)udaddr & PAGE_MASK); 140 if (n > len) 141 n = len; 142 lwb = lwbuf_alloc(m); 143 bcopy((char *)lwbuf_kva(lwb)+((vm_offset_t)udaddr & PAGE_MASK), 144 kaddr, n); 145 len -= n; 146 udaddr = (const char *)udaddr + n; 147 kaddr = (char *)kaddr + n; 148 lwbuf_free(lwb); 149 vm_page_unhold(m); 150 } 151 return (error); 152 } 153 154 /* 155 * Copy a binary buffer from kernel space to user space. 156 * 157 * Returns 0 on success, EFAULT on failure. 158 */ 159 int 160 copyout(const void *kaddr, void *udaddr, size_t len) 161 { 162 struct vmspace *vm = curproc->p_vmspace; 163 struct lwbuf *lwb; 164 vm_page_t m; 165 int error; 166 size_t n; 167 168 error = 0; 169 while (len) { 170 m = vm_fault_page(&vm->vm_map, trunc_page((vm_offset_t)udaddr), 171 VM_PROT_READ|VM_PROT_WRITE, 172 VM_FAULT_NORMAL, &error); 173 if (error) 174 break; 175 n = PAGE_SIZE - ((vm_offset_t)udaddr & PAGE_MASK); 176 if (n > len) 177 n = len; 178 lwb = lwbuf_alloc(m); 179 bcopy(kaddr, (char *)lwbuf_kva(lwb) + 180 ((vm_offset_t)udaddr & PAGE_MASK), n); 181 len -= n; 182 udaddr = (char *)udaddr + n; 183 kaddr = (const char *)kaddr + n; 184 vm_page_dirty(m); 185 lwbuf_free(lwb); 186 vm_page_unhold(m); 187 } 188 return (error); 189 } 190 191 /* 192 * Fetch the byte at the specified user address. Returns -1 on failure. 193 */ 194 int 195 fubyte(const void *base) 196 { 197 unsigned char c; 198 199 if (copyin(base, &c, 1) == 0) 200 return((int)c); 201 return(-1); 202 } 203 204 /* 205 * Store a byte at the specified user address. Returns -1 on failure. 206 */ 207 int 208 subyte (void *base, int byte) 209 { 210 unsigned char c = byte; 211 212 if (copyout(&c, base, 1) == 0) 213 return(0); 214 return(-1); 215 } 216 217 /* 218 * Fetch a word (integer, 32 bits) from user space 219 */ 220 long 221 fuword(const void *base) 222 { 223 long v; 224 225 if (copyin(base, &v, sizeof(v)) == 0) 226 return((long)v); 227 return(-1); 228 } 229 230 /* 231 * Store a word (integer, 32 bits) to user space 232 */ 233 int 234 suword(void *base, long word) 235 { 236 if (copyout(&word, base, sizeof(word)) == 0) 237 return(0); 238 return(-1); 239 } 240 241 /* 242 * Fetch an short word (16 bits) from user space 243 */ 244 int 245 fusword(void *base) 246 { 247 unsigned short sword; 248 249 if (copyin(base, &sword, sizeof(sword)) == 0) 250 return((int)sword); 251 return(-1); 252 } 253 254 /* 255 * Store a short word (16 bits) to user space 256 */ 257 int 258 susword (void *base, int word) 259 { 260 unsigned short sword = word; 261 262 if (copyout(&sword, base, sizeof(sword)) == 0) 263 return(0); 264 return(-1); 265 } 266