scripts/mod/file2alias.c

   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->manf_id = TO_NATIVE(id->manf_id);
 299         id->card_id = TO_NATIVE(id->card_id);
 300         id->func_id = TO_NATIVE(id->func_id);
 301         id->function = TO_NATIVE(id->function);
 302         id->device_no = TO_NATIVE(id->device_no);
 303         for (i=0; i<4; i++) {
 304                 id->prod_id_hash[i] = TO_NATIVE(id->prod_id_hash[i]);
 305        }
 306
 307        strcpy(alias, "pcmcia:");
 308        ADD(alias, "m", id->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID,
 309            id->manf_id);
 310        ADD(alias, "c", id->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID,
 311            id->card_id);
 312        ADD(alias, "f", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID,
 313            id->func_id);
 314        ADD(alias, "fn", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION,
 315            id->function);
 316        ADD(alias, "pfn", id->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO,
 317            id->device_no);
 318        ADD(alias, "pa", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1, id->prod_id_hash[0]);
 319        ADD(alias, "pb", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2, id->prod_id_hash[1]);
 320        ADD(alias, "pc", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3, id->prod_id_hash[2]);
 321        ADD(alias, "pd", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4, id->prod_id_hash[3]);
 322
 323        return 1;
 324 }
 325
 326
 327
 328 static int do_of_entry (const char *filename, struct of_device_id *of, char *alias)
 329 {
 330     char *tmp;
 331     sprintf (alias, "of:N%sT%sC%s",
 332                     of->name[0] ? of->name : "*",
 333                     of->type[0] ? of->type : "*",
 334                     of->compatible[0] ? of->compatible : "*");
 335
 336     /* Replace all whitespace with underscores */
 337     for (tmp = alias; tmp && *tmp; tmp++)
 338         if (isspace (*tmp))
 339             *tmp = '_';
 340
 341     return 1;
 342 }
 343
 344 /* Ignore any prefix, eg. v850 prepends _ */
 345 static inline int sym_is(const char *symbol, const char *name)
 346 {
 347         const char *match;
 348
 349         match = strstr(symbol, name);
 350         if (!match)
 351                 return 0;
 352         return match[strlen(symbol)] == '\0';
 353 }
 354
 355 static void do_table(void *symval, unsigned long size,
 356                      unsigned long id_size,
 357                      void *function,
 358                      struct module *mod)
 359 {
 360         unsigned int i;
 361         char alias[500];
 362         int (*do_entry)(const char *, void *entry, char *alias) = function;
 363
 364         if (size % id_size || size < id_size) {
 365                 fprintf(stderr, "*** Warning: %s ids %lu bad size "
 366                         "(each on %lu)\n", mod->name, size, id_size);
 367         }
 368         /* Leave last one: it's the terminator. */
 369         size -= id_size;
 370
 371         for (i = 0; i < size; i += id_size) {
 372                 if (do_entry(mod->name, symval+i, alias)) {
 373                         /* Always end in a wildcard, for future extension */
 374                         if (alias[strlen(alias)-1] != '*')
 375                                 strcat(alias, "*");
 376                         buf_printf(&mod->dev_table_buf,
 377                                    "MODULE_ALIAS(\"%s\");\n", alias);
 378                 }
 379         }
 380 }
 381
 382 /* Create MODULE_ALIAS() statements.
 383  * At this time, we cannot write the actual output C source yet,
 384  * so we write into the mod->dev_table_buf buffer. */
 385 void handle_moddevtable(struct module *mod, struct elf_info *info,
 386                         Elf_Sym *sym, const char *symname)
 387 {
 388         void *symval;
 389
 390         /* We're looking for a section relative symbol */
 391         if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum)
 392                 return;
 393
 394         symval = (void *)info->hdr
 395                 + info->sechdrs[sym->st_shndx].sh_offset
 396                 + sym->st_value;
 397
 398         if (sym_is(symname, "__mod_pci_device_table"))
 399                 do_table(symval, sym->st_size, sizeof(struct pci_device_id),
 400                          do_pci_entry, mod);
 401         else if (sym_is(symname, "__mod_usb_device_table"))
 402                 /* special case to handle bcdDevice ranges */
 403                 do_usb_table(symval, sym->st_size, mod);
 404         else if (sym_is(symname, "__mod_ieee1394_device_table"))
 405                 do_table(symval, sym->st_size, sizeof(struct ieee1394_device_id),
 406                          do_ieee1394_entry, mod);
 407         else if (sym_is(symname, "__mod_ccw_device_table"))
 408                 do_table(symval, sym->st_size, sizeof(struct ccw_device_id),
 409                          do_ccw_entry, mod);
 410         else if (sym_is(symname, "__mod_serio_device_table"))
 411                 do_table(symval, sym->st_size, sizeof(struct serio_device_id),
 412                          do_serio_entry, mod);
 413         else if (sym_is(symname, "__mod_pnp_device_table"))
 414                 do_table(symval, sym->st_size, sizeof(struct pnp_device_id),
 415                          do_pnp_entry, mod);
 416         else if (sym_is(symname, "__mod_pnp_card_device_table"))
 417                 do_table(symval, sym->st_size, sizeof(struct pnp_card_device_id),
 418                          do_pnp_card_entry, mod);
 419         else if (sym_is(symname, "__mod_pcmcia_device_table"))
 420                 do_table(symval, sym->st_size, sizeof(struct pcmcia_device_id),
 421                          do_pcmcia_entry, mod);
 422         else if (sym_is(symname, "__mod_of_device_table"))
 423                 do_table(symval, sym->st_size, sizeof(struct of_device_id),
 424                          do_of_entry, mod);
 425
 426 }
 427
 428 /* Now add out buffered information to the generated C source */
 429 void add_moddevtable(struct buffer *buf, struct module *mod)
 430 {
 431         buf_printf(buf, "\n");
 432         buf_write(buf, mod->dev_table_buf.p, mod->dev_table_buf.pos);
 433         free(mod->dev_table_buf.p);
 434 }