1 /* Simple code to turn various tables in an ELF file into alias definitions. 2 * This deals with kernel datastructures where they should be 3 * dealt with: in the kernel source. 4 * 5 * Copyright 2002-2003 Rusty Russell, IBM Corporation 6 * 2003 Kai Germaschewski 7 * 8 * 9 * This software may be used and distributed according to the terms 10 * of the GNU General Public License, incorporated herein by reference. 11 */ 12 13 #include "modpost.h" 14 15 /* We use the ELF typedefs for kernel_ulong_t but bite the bullet and 16 * use either stdint.h or inttypes.h for the rest. */ 17 #if KERNEL_ELFCLASS == ELFCLASS32 18 typedef Elf32_Addr kernel_ulong_t; 19 #else 20 typedef Elf64_Addr kernel_ulong_t; 21 #endif 22 #ifdef __sun__ 23 #include <inttypes.h> 24 #else 25 #include <stdint.h> 26 #endif 27 28 #include <ctype.h> 29 30 typedef uint32_t __u32; 31 typedef uint16_t __u16; 32 typedef unsigned char __u8; 33 34 /* Big exception to the "don't include kernel headers into userspace, which 35 * even potentially has different endianness and word sizes, since 36 * we handle those differences explicitly below */ 37 #include "../../include/linux/mod_devicetable.h" 38 39 #define ADD(str, sep, cond, field) \ 40 do { \ 41 strcat(str, sep); \ 42 if (cond) \ 43 sprintf(str + strlen(str), \ 44 sizeof(field) == 1 ? "%02X" : \ 45 sizeof(field) == 2 ? "%04X" : \ 46 sizeof(field) == 4 ? "%08X" : "", \ 47 field); \ 48 else \ 49 sprintf(str + strlen(str), "*"); \ 50 } while(0) 51 52 /* USB is special because the bcdDevice can be matched against a numeric range */ 53 /* Looks like "usb:vNpNdNdcNdscNdpNicNiscNipN" */ 54 static void do_usb_entry(struct usb_device_id *id, 55 unsigned int bcdDevice_initial, int bcdDevice_initial_digits, 56 unsigned char range_lo, unsigned char range_hi, 57 struct module *mod) 58 { 59 char alias[500]; 60 strcpy(alias, "usb:"); 61 ADD(alias, "v", id->match_flags&USB_DEVICE_ID_MATCH_VENDOR, 62 id->idVendor); 63 ADD(alias, "p", id->match_flags&USB_DEVICE_ID_MATCH_PRODUCT, 64 id->idProduct); 65 66 strcat(alias, "d"); 67 if (bcdDevice_initial_digits) 68 sprintf(alias + strlen(alias), "%0*X", 69 bcdDevice_initial_digits, bcdDevice_initial); 70 if (range_lo == range_hi) 71 sprintf(alias + strlen(alias), "%u", range_lo); 72 else if (range_lo > 0 || range_hi < 9) 73 sprintf(alias + strlen(alias), "[%u-%u]", range_lo, range_hi); 74 if (bcdDevice_initial_digits < (sizeof(id->bcdDevice_lo) * 2 - 1)) 75 strcat(alias, "*"); 76 77 ADD(alias, "dc", id->match_flags&USB_DEVICE_ID_MATCH_DEV_CLASS, 78 id->bDeviceClass); 79 ADD(alias, "dsc", 80 id->match_flags&USB_DEVICE_ID_MATCH_DEV_SUBCLASS, 81 id->bDeviceSubClass); 82 ADD(alias, "dp", 83 id->match_flags&USB_DEVICE_ID_MATCH_DEV_PROTOCOL, 84 id->bDeviceProtocol); 85 ADD(alias, "ic", 86 id->match_flags&USB_DEVICE_ID_MATCH_INT_CLASS, 87 id->bInterfaceClass); 88 ADD(alias, "isc", 89 id->match_flags&USB_DEVICE_ID_MATCH_INT_SUBCLASS, 90 id->bInterfaceSubClass); 91 ADD(alias, "ip", 92 id->match_flags&USB_DEVICE_ID_MATCH_INT_PROTOCOL, 93 id->bInterfaceProtocol); 94 95 /* Always end in a wildcard, for future extension */ 96 if (alias[strlen(alias)-1] != '*') 97 strcat(alias, "*"); 98 buf_printf(&mod->dev_table_buf, 99 "MODULE_ALIAS(\"%s\");\n", alias); 100 } 101 102 static void do_usb_entry_multi(struct usb_device_id *id, struct module *mod) 103 { 104 unsigned int devlo, devhi; 105 unsigned char chi, clo; 106 int ndigits; 107 108 id->match_flags = TO_NATIVE(id->match_flags); 109 id->idVendor = TO_NATIVE(id->idVendor); 110 id->idProduct = TO_NATIVE(id->idProduct); 111 112 devlo = id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO ? 113 TO_NATIVE(id->bcdDevice_lo) : 0x0U; 114 devhi = id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI ? 115 TO_NATIVE(id->bcdDevice_hi) : ~0x0U; 116 117 /* 118 * Some modules (visor) have empty slots as placeholder for 119 * run-time specification that results in catch-all alias 120 */ 121 if (!(id->idVendor | id->bDeviceClass | id->bInterfaceClass)) 122 return; 123 124 /* Convert numeric bcdDevice range into fnmatch-able pattern(s) */ 125 for (ndigits = sizeof(id->bcdDevice_lo) * 2 - 1; devlo <= devhi; ndigits--) { 126 clo = devlo & 0xf; 127 chi = devhi & 0xf; 128 if (chi > 9) /* it's bcd not hex */ 129 chi = 9; 130 devlo >>= 4; 131 devhi >>= 4; 132 133 if (devlo == devhi || !ndigits) { 134 do_usb_entry(id, devlo, ndigits, clo, chi, mod); 135 break; 136 } 137 138 if (clo > 0) 139 do_usb_entry(id, devlo++, ndigits, clo, 9, mod); 140 141 if (chi < 9) 142 do_usb_entry(id, devhi--, ndigits, 0, chi, mod); 143 } 144 } 145 146 static void do_usb_table(void *symval, unsigned long size, 147 struct module *mod) 148 { 149 unsigned int i; 150 const unsigned long id_size = sizeof(struct usb_device_id); 151 152 if (size % id_size || size < id_size) { 153 fprintf(stderr, "*** Warning: %s ids %lu bad size " 154 "(each on %lu)\n", mod->name, size, id_size); 155 } 156 /* Leave last one: it's the terminator. */ 157 size -= id_size; 158 159 for (i = 0; i < size; i += id_size) 160 do_usb_entry_multi(symval + i, mod); 161 } 162 163 /* Looks like: ieee1394:venNmoNspNverN */ 164 static int do_ieee1394_entry(const char *filename, 165 struct ieee1394_device_id *id, char *alias) 166 { 167 id->match_flags = TO_NATIVE(id->match_flags); 168 id->vendor_id = TO_NATIVE(id->vendor_id); 169 id->model_id = TO_NATIVE(id->model_id); 170 id->specifier_id = TO_NATIVE(id->specifier_id); 171 id->version = TO_NATIVE(id->version); 172 173 strcpy(alias, "ieee1394:"); 174 ADD(alias, "ven", id->match_flags & IEEE1394_MATCH_VENDOR_ID, 175 id->vendor_id); 176 ADD(alias, "mo", id->match_flags & IEEE1394_MATCH_MODEL_ID, 177 id->model_id); 178 ADD(alias, "sp", id->match_flags & IEEE1394_MATCH_SPECIFIER_ID, 179 id->specifier_id); 180 ADD(alias, "ver", id->match_flags & IEEE1394_MATCH_VERSION, 181 id->version); 182 183 return 1; 184 } 185 186 /* Looks like: pci:vNdNsvNsdNbcNscNiN. */ 187 static int do_pci_entry(const char *filename, 188 struct pci_device_id *id, char *alias) 189 { 190 /* Class field can be divided into these three. */ 191 unsigned char baseclass, subclass, interface, 192 baseclass_mask, subclass_mask, interface_mask; 193 194 id->vendor = TO_NATIVE(id->vendor); 195 id->device = TO_NATIVE(id->device); 196 id->subvendor = TO_NATIVE(id->subvendor); 197 id->subdevice = TO_NATIVE(id->subdevice); 198 id->class = TO_NATIVE(id->class); 199 id->class_mask = TO_NATIVE(id->class_mask); 200 201 strcpy(alias, "pci:"); 202 ADD(alias, "v", id->vendor != PCI_ANY_ID, id->vendor); 203 ADD(alias, "d", id->device != PCI_ANY_ID, id->device); 204 ADD(alias, "sv", id->subvendor != PCI_ANY_ID, id->subvendor); 205 ADD(alias, "sd", id->subdevice != PCI_ANY_ID, id->subdevice); 206 207 baseclass = (id->class) >> 16; 208 baseclass_mask = (id->class_mask) >> 16; 209 subclass = (id->class) >> 8; 210 subclass_mask = (id->class_mask) >> 8; 211 interface = id->class; 212 interface_mask = id->class_mask; 213 214 if ((baseclass_mask != 0 && baseclass_mask != 0xFF) 215 || (subclass_mask != 0 && subclass_mask != 0xFF) 216 || (interface_mask != 0 && interface_mask != 0xFF)) { 217 fprintf(stderr, 218 "*** Warning: Can't handle masks in %s:%04X\n", 219 filename, id->class_mask); 220 return 0; 221 } 222 223 ADD(alias, "bc", baseclass_mask == 0xFF, baseclass); 224 ADD(alias, "sc", subclass_mask == 0xFF, subclass); 225 ADD(alias, "i", interface_mask == 0xFF, interface); 226 return 1; 227 } 228 229 /* looks like: "ccw:tNmNdtNdmN" */ 230 static int do_ccw_entry(const char *filename, 231 struct ccw_device_id *id, char *alias) 232 { 233 id->match_flags = TO_NATIVE(id->match_flags); 234 id->cu_type = TO_NATIVE(id->cu_type); 235 id->cu_model = TO_NATIVE(id->cu_model); 236 id->dev_type = TO_NATIVE(id->dev_type); 237 id->dev_model = TO_NATIVE(id->dev_model); 238 239 strcpy(alias, "ccw:"); 240 ADD(alias, "t", id->match_flags&CCW_DEVICE_ID_MATCH_CU_TYPE, 241 id->cu_type); 242 ADD(alias, "m", id->match_flags&CCW_DEVICE_ID_MATCH_CU_MODEL, 243 id->cu_model); 244 ADD(alias, "dt", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE, 245 id->dev_type); 246 ADD(alias, "dm", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE, 247 id->dev_model); 248 return 1; 249 } 250 251 /* Looks like: "serio:tyNprNidNexN" */ 252 static int do_serio_entry(const char *filename, 253 struct serio_device_id *id, char *alias) 254 { 255 id->type = TO_NATIVE(id->type); 256 id->proto = TO_NATIVE(id->proto); 257 id->id = TO_NATIVE(id->id); 258 id->extra = TO_NATIVE(id->extra); 259 260 strcpy(alias, "serio:"); 261 ADD(alias, "ty", id->type != SERIO_ANY, id->type); 262 ADD(alias, "pr", id->proto != SERIO_ANY, id->proto); 263 ADD(alias, "id", id->id != SERIO_ANY, id->id); 264 ADD(alias, "ex", id->extra != SERIO_ANY, id->extra); 265 266 return 1; 267 } 268 269 /* looks like: "pnp:dD" */ 270 static int do_pnp_entry(const char *filename, 271 struct pnp_device_id *id, char *alias) 272 { 273 sprintf(alias, "pnp:d%s", id->id); 274 return 1; 275 } 276 277 /* looks like: "pnp:cCdD..." */ 278 static int do_pnp_card_entry(const char *filename, 279 struct pnp_card_device_id *id, char *alias) 280 { 281 int i; 282 283 sprintf(alias, "pnp:c%s", id->id); 284 for (i = 0; i < PNP_MAX_DEVICES; i++) { 285 if (! *id->devs[i].id) 286 break; 287 sprintf(alias + strlen(alias), "d%s", id->devs[i].id); 288 } 289 return 1; 290 } 291 292 /* Looks like: pcmcia:mNcNfNfnNpfnNvaNvbNvcNvdN. */ 293 static int do_pcmcia_entry(const char *filename, 294 struct pcmcia_device_id *id, char *alias) 295 { 296 unsigned int i; 297 298 id->match_flags = TO_NATIVE(id->match_flags); 299 id->manf_id = TO_NATIVE(id->manf_id); 300 id->card_id = TO_NATIVE(id->card_id); 301 id->func_id = TO_NATIVE(id->func_id); 302 id->function = TO_NATIVE(id->function); 303 id->device_no = TO_NATIVE(id->device_no); 304 305 for (i=0; i<4; i++) { 306 id->prod_id_hash[i] = TO_NATIVE(id->prod_id_hash[i]); 307 } 308 309 strcpy(alias, "pcmcia:"); 310 ADD(alias, "m", id->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID, 311 id->manf_id); 312 ADD(alias, "c", id->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID, 313 id->card_id); 314 ADD(alias, "f", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID, 315 id->func_id); 316 ADD(alias, "fn", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION, 317 id->function); 318 ADD(alias, "pfn", id->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO, 319 id->device_no); 320 ADD(alias, "pa", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1, id->prod_id_hash[0]); 321 ADD(alias, "pb", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2, id->prod_id_hash[1]); 322 ADD(alias, "pc", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3, id->prod_id_hash[2]); 323 ADD(alias, "pd", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4, id->prod_id_hash[3]); 324 325 return 1; 326 } 327 328 329 330 static int do_of_entry (const char *filename, struct of_device_id *of, char *alias) 331 { 332 char *tmp; 333 sprintf (alias, "of:N%sT%sC%s", 334 of->name[0] ? of->name : "*", 335 of->type[0] ? of->type : "*", 336 of->compatible[0] ? of->compatible : "*"); 337 338 /* Replace all whitespace with underscores */ 339 for (tmp = alias; tmp && *tmp; tmp++) 340 if (isspace (*tmp)) 341 *tmp = '_'; 342 343 return 1; 344 } 345 346 static int do_vio_entry(const char *filename, struct vio_device_id *vio, 347 char *alias) 348 { 349 char *tmp; 350 351 sprintf(alias, "vio:T%sS%s", vio->type[0] ? vio->type : "*", 352 vio->compat[0] ? vio->compat : "*"); 353 354 /* Replace all whitespace with underscores */ 355 for (tmp = alias; tmp && *tmp; tmp++) 356 if (isspace (*tmp)) 357 *tmp = '_'; 358 359 return 1; 360 } 361 362 /* Ignore any prefix, eg. v850 prepends _ */ 363 static inline int sym_is(const char *symbol, const char *name) 364 { 365 const char *match; 366 367 match = strstr(symbol, name); 368 if (!match) 369 return 0; 370 return match[strlen(symbol)] == '\0'; 371 } 372 373 static void do_table(void *symval, unsigned long size, 374 unsigned long id_size, 375 void *function, 376 struct module *mod) 377 { 378 unsigned int i; 379 char alias[500]; 380 int (*do_entry)(const char *, void *entry, char *alias) = function; 381 382 if (size % id_size || size < id_size) { 383 fprintf(stderr, "*** Warning: %s ids %lu bad size " 384 "(each on %lu)\n", mod->name, size, id_size); 385 } 386 /* Leave last one: it's the terminator. */ 387 size -= id_size; 388 389 for (i = 0; i < size; i += id_size) { 390 if (do_entry(mod->name, symval+i, alias)) { 391 /* Always end in a wildcard, for future extension */ 392 if (alias[strlen(alias)-1] != '*') 393 strcat(alias, "*"); 394 buf_printf(&mod->dev_table_buf, 395 "MODULE_ALIAS(\"%s\");\n", alias); 396 } 397 } 398 } 399 400 /* Create MODULE_ALIAS() statements. 401 * At this time, we cannot write the actual output C source yet, 402 * so we write into the mod->dev_table_buf buffer. */ 403 void handle_moddevtable(struct module *mod, struct elf_info *info, 404 Elf_Sym *sym, const char *symname) 405 { 406 void *symval; 407 408 /* We're looking for a section relative symbol */ 409 if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum) 410 return; 411 412 symval = (void *)info->hdr 413 + info->sechdrs[sym->st_shndx].sh_offset 414 + sym->st_value; 415 416 if (sym_is(symname, "__mod_pci_device_table")) 417 do_table(symval, sym->st_size, sizeof(struct pci_device_id), 418 do_pci_entry, mod); 419 else if (sym_is(symname, "__mod_usb_device_table")) 420 /* special case to handle bcdDevice ranges */ 421 do_usb_table(symval, sym->st_size, mod); 422 else if (sym_is(symname, "__mod_ieee1394_device_table")) 423 do_table(symval, sym->st_size, sizeof(struct ieee1394_device_id), 424 do_ieee1394_entry, mod); 425 else if (sym_is(symname, "__mod_ccw_device_table")) 426 do_table(symval, sym->st_size, sizeof(struct ccw_device_id), 427 do_ccw_entry, mod); 428 else if (sym_is(symname, "__mod_serio_device_table")) 429 do_table(symval, sym->st_size, sizeof(struct serio_device_id), 430 do_serio_entry, mod); 431 else if (sym_is(symname, "__mod_pnp_device_table")) 432 do_table(symval, sym->st_size, sizeof(struct pnp_device_id), 433 do_pnp_entry, mod); 434 else if (sym_is(symname, "__mod_pnp_card_device_table")) 435 do_table(symval, sym->st_size, sizeof(struct pnp_card_device_id), 436 do_pnp_card_entry, mod); 437 else if (sym_is(symname, "__mod_pcmcia_device_table")) 438 do_table(symval, sym->st_size, sizeof(struct pcmcia_device_id), 439 do_pcmcia_entry, mod); 440 else if (sym_is(symname, "__mod_of_device_table")) 441 do_table(symval, sym->st_size, sizeof(struct of_device_id), 442 do_of_entry, mod); 443 else if (sym_is(symname, "__mod_vio_device_table")) 444 do_table(symval, sym->st_size, sizeof(struct vio_device_id), 445 do_vio_entry, mod); 446 447 } 448 449 /* Now add out buffered information to the generated C source */ 450 void add_moddevtable(struct buffer *buf, struct module *mod) 451 { 452 buf_printf(buf, "\n"); 453 buf_write(buf, mod->dev_table_buf.p, mod->dev_table_buf.pos); 454 free(mod->dev_table_buf.p); 455 } 456