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 typedef uint32_t        __u32;
  29 typedef uint16_t        __u16;
  30 typedef unsigned char   __u8;
  31
  32 /* Big exception to the "don't include kernel headers into userspace, which
  33  * even potentially has different endianness and word sizes, since
  34  * we handle those differences explicitly below */
  35 #include "../../include/linux/mod_devicetable.h"
  36
  37 #define ADD(str, sep, cond, field)                              \
  38 do {                                                            \
  39         strcat(str, sep);                                       \
  40         if (cond)                                               \
  41                 sprintf(str + strlen(str),                      \
  42                         sizeof(field) == 1 ? "%02X" :           \
  43                         sizeof(field) == 2 ? "%04X" :           \
  44                         sizeof(field) == 4 ? "%08X" : "",       \
  45                         field);                                 \
  46         else                                                    \
  47                 sprintf(str + strlen(str), "*");                \
  48 } while(0)
  49
  50 /* Looks like "usb:vNpNdlNdhNdcNdscNdpNicNiscNipN" */
  51 static int do_usb_entry(const char *filename,
  52                         struct usb_device_id *id, char *alias)
  53 {
  54         id->match_flags = TO_NATIVE(id->match_flags);
  55         id->idVendor = TO_NATIVE(id->idVendor);
  56         id->idProduct = TO_NATIVE(id->idProduct);
  57         id->bcdDevice_lo = TO_NATIVE(id->bcdDevice_lo);
  58         id->bcdDevice_hi = TO_NATIVE(id->bcdDevice_hi);
  59
  60         /*
  61          * Some modules (visor) have empty slots as placeholder for
  62          * run-time specification that results in catch-all alias
  63          */
  64         if (!(id->idVendor | id->bDeviceClass | id->bInterfaceClass))
  65                 return 1;
  66
  67         strcpy(alias, "usb:");
  68         ADD(alias, "v", id->match_flags&USB_DEVICE_ID_MATCH_VENDOR,
  69             id->idVendor);
  70         ADD(alias, "p", id->match_flags&USB_DEVICE_ID_MATCH_PRODUCT,
  71             id->idProduct);
  72         ADD(alias, "dl", id->match_flags&USB_DEVICE_ID_MATCH_DEV_LO,
  73             id->bcdDevice_lo);
  74         ADD(alias, "dh", id->match_flags&USB_DEVICE_ID_MATCH_DEV_HI,
  75             id->bcdDevice_hi);
  76         ADD(alias, "dc", id->match_flags&USB_DEVICE_ID_MATCH_DEV_CLASS,
  77             id->bDeviceClass);
  78         ADD(alias, "dsc",
  79             id->match_flags&USB_DEVICE_ID_MATCH_DEV_SUBCLASS,
  80             id->bDeviceSubClass);
  81         ADD(alias, "dp",
  82             id->match_flags&USB_DEVICE_ID_MATCH_DEV_PROTOCOL,
  83             id->bDeviceProtocol);
  84         ADD(alias, "ic",
  85             id->match_flags&USB_DEVICE_ID_MATCH_INT_CLASS,
  86             id->bInterfaceClass);
  87         ADD(alias, "isc",
  88             id->match_flags&USB_DEVICE_ID_MATCH_INT_SUBCLASS,
  89             id->bInterfaceSubClass);
  90         ADD(alias, "ip",
  91             id->match_flags&USB_DEVICE_ID_MATCH_INT_PROTOCOL,
  92             id->bInterfaceProtocol);
  93         return 1;
  94 }
  95
  96 /* Looks like: ieee1394:venNmoNspNverN */
  97 static int do_ieee1394_entry(const char *filename,
  98                              struct ieee1394_device_id *id, char *alias)
  99 {
 100         id->match_flags = TO_NATIVE(id->match_flags);
 101         id->vendor_id = TO_NATIVE(id->vendor_id);
 102         id->model_id = TO_NATIVE(id->model_id);
 103         id->specifier_id = TO_NATIVE(id->specifier_id);
 104         id->version = TO_NATIVE(id->version);
 105
 106         strcpy(alias, "ieee1394:");
 107         ADD(alias, "ven", id->match_flags & IEEE1394_MATCH_VENDOR_ID,
 108             id->vendor_id);
 109         ADD(alias, "mo", id->match_flags & IEEE1394_MATCH_MODEL_ID,
 110             id->model_id);
 111         ADD(alias, "sp", id->match_flags & IEEE1394_MATCH_SPECIFIER_ID,
 112             id->specifier_id);
 113         ADD(alias, "ver", id->match_flags & IEEE1394_MATCH_VERSION,
 114             id->version);
 115
 116         return 1;
 117 }
 118
 119 /* Looks like: pci:vNdNsvNsdNbcNscNiN. */
 120 static int do_pci_entry(const char *filename,
 121                         struct pci_device_id *id, char *alias)
 122 {
 123         /* Class field can be divided into these three. */
 124         unsigned char baseclass, subclass, interface,
 125                 baseclass_mask, subclass_mask, interface_mask;
 126
 127         id->vendor = TO_NATIVE(id->vendor);
 128         id->device = TO_NATIVE(id->device);
 129         id->subvendor = TO_NATIVE(id->subvendor);
 130         id->subdevice = TO_NATIVE(id->subdevice);
 131         id->class = TO_NATIVE(id->class);
 132         id->class_mask = TO_NATIVE(id->class_mask);
 133
 134         strcpy(alias, "pci:");
 135         ADD(alias, "v", id->vendor != PCI_ANY_ID, id->vendor);
 136         ADD(alias, "d", id->device != PCI_ANY_ID, id->device);
 137         ADD(alias, "sv", id->subvendor != PCI_ANY_ID, id->subvendor);
 138         ADD(alias, "sd", id->subdevice != PCI_ANY_ID, id->subdevice);
 139
 140         baseclass = (id->class) >> 16;
 141         baseclass_mask = (id->class_mask) >> 16;
 142         subclass = (id->class) >> 8;
 143         subclass_mask = (id->class_mask) >> 8;
 144         interface = id->class;
 145         interface_mask = id->class_mask;
 146
 147         if ((baseclass_mask != 0 && baseclass_mask != 0xFF)
 148             || (subclass_mask != 0 && subclass_mask != 0xFF)
 149             || (interface_mask != 0 && interface_mask != 0xFF)) {
 150                 fprintf(stderr,
 151                         "*** Warning: Can't handle masks in %s:%04X\n",
 152                         filename, id->class_mask);
 153                 return 0;
 154         }
 155
 156         ADD(alias, "bc", baseclass_mask == 0xFF, baseclass);
 157         ADD(alias, "sc", subclass_mask == 0xFF, subclass);
 158         ADD(alias, "i", interface_mask == 0xFF, interface);
 159         return 1;
 160 }
 161
 162 /* looks like: "ccw:tNmNdtNdmN" */
 163 static int do_ccw_entry(const char *filename,
 164                         struct ccw_device_id *id, char *alias)
 165 {
 166         id->match_flags = TO_NATIVE(id->match_flags);
 167         id->cu_type = TO_NATIVE(id->cu_type);
 168         id->cu_model = TO_NATIVE(id->cu_model);
 169         id->dev_type = TO_NATIVE(id->dev_type);
 170         id->dev_model = TO_NATIVE(id->dev_model);
 171
 172         strcpy(alias, "ccw:");
 173         ADD(alias, "t", id->match_flags&CCW_DEVICE_ID_MATCH_CU_TYPE,
 174             id->cu_type);
 175         ADD(alias, "m", id->match_flags&CCW_DEVICE_ID_MATCH_CU_MODEL,
 176             id->cu_model);
 177         ADD(alias, "dt", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE,
 178             id->dev_type);
 179         ADD(alias, "dm", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE,
 180             id->dev_model);
 181         return 1;
 182 }
 183
 184 /* looks like: "pnp:dD" */
 185 static int do_pnp_entry(const char *filename,
 186                         struct pnp_device_id *id, char *alias)
 187 {
 188         sprintf(alias, "pnp:d%s", id->id);
 189         return 1;
 190 }
 191
 192 /* looks like: "pnp:cCdD..." */
 193 static int do_pnp_card_entry(const char *filename,
 194                         struct pnp_card_device_id *id, char *alias)
 195 {
 196         int i;
 197
 198         sprintf(alias, "pnp:c%s", id->id);
 199         for (i = 0; i < PNP_MAX_DEVICES; i++) {
 200                 if (! *id->devs[i].id)
 201                         break;
 202                 sprintf(alias + strlen(alias), "d%s", id->devs[i].id);
 203         }
 204         return 1;
 205 }
 206
 207 /* Ignore any prefix, eg. v850 prepends _ */
 208 static inline int sym_is(const char *symbol, const char *name)
 209 {
 210         const char *match;
 211
 212         match = strstr(symbol, name);
 213         if (!match)
 214                 return 0;
 215         return match[strlen(symbol)] == '\0';
 216 }
 217
 218 static void do_table(void *symval, unsigned long size,
 219                      unsigned long id_size,
 220                      void *function,
 221                      struct module *mod)
 222 {
 223         unsigned int i;
 224         char alias[500];
 225         int (*do_entry)(const char *, void *entry, char *alias) = function;
 226
 227         if (size % id_size || size < id_size) {
 228                 fprintf(stderr, "*** Warning: %s ids %lu bad size "
 229                         "(each on %lu)\n", mod->name, size, id_size);
 230         }
 231         /* Leave last one: it's the terminator. */
 232         size -= id_size;
 233
 234         for (i = 0; i < size; i += id_size) {
 235                 if (do_entry(mod->name, symval+i, alias)) {
 236                         /* Always end in a wildcard, for future extension */
 237                         if (alias[strlen(alias)-1] != '*')
 238                                 strcat(alias, "*");
 239                         buf_printf(&mod->dev_table_buf,
 240                                    "MODULE_ALIAS(\"%s\");\n", alias);
 241                 }
 242         }
 243 }
 244
 245 /* Create MODULE_ALIAS() statements.
 246  * At this time, we cannot write the actual output C source yet,
 247  * so we write into the mod->dev_table_buf buffer. */
 248 void handle_moddevtable(struct module *mod, struct elf_info *info,
 249                         Elf_Sym *sym, const char *symname)
 250 {
 251         void *symval;
 252
 253         /* We're looking for a section relative symbol */
 254         if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum)
 255                 return;
 256
 257         symval = (void *)info->hdr
 258                 + info->sechdrs[sym->st_shndx].sh_offset
 259                 + sym->st_value;
 260
 261         if (sym_is(symname, "__mod_pci_device_table"))
 262                 do_table(symval, sym->st_size, sizeof(struct pci_device_id),
 263                          do_pci_entry, mod);
 264         else if (sym_is(symname, "__mod_usb_device_table"))
 265                 do_table(symval, sym->st_size, sizeof(struct usb_device_id),
 266                          do_usb_entry, mod);
 267         else if (sym_is(symname, "__mod_ieee1394_device_table"))
 268                 do_table(symval, sym->st_size, sizeof(struct ieee1394_device_id),
 269                          do_ieee1394_entry, mod);
 270         else if (sym_is(symname, "__mod_ccw_device_table"))
 271                 do_table(symval, sym->st_size, sizeof(struct ccw_device_id),
 272                          do_ccw_entry, mod);
 273         else if (sym_is(symname, "__mod_pnp_device_table"))
 274                 do_table(symval, sym->st_size, sizeof(struct pnp_device_id),
 275                          do_pnp_entry, mod);
 276         else if (sym_is(symname, "__mod_pnp_card_device_table"))
 277                 do_table(symval, sym->st_size, sizeof(struct pnp_card_device_id),
 278                          do_pnp_card_entry, mod);
 279 }
 280
 281 /* Now add out buffered information to the generated C source */
 282 void add_moddevtable(struct buffer *buf, struct module *mod)
 283 {
 284         buf_printf(buf, "\n");
 285         buf_write(buf, mod->dev_table_buf.p, mod->dev_table_buf.pos);
 286         free(mod->dev_table_buf.p);
 287 }