summaryrefslogtreecommitdiffstats
path: root/scripts/mod/file2alias.c
blob: 908bff6d1eefda049420abac6f8857660f88b3e9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
/* Simple code to turn various tables in an ELF file into alias definitions.
 * This deals with kernel datastructures where they should be
 * dealt with: in the kernel source.
 *
 * Copyright 2002-2003  Rusty Russell, IBM Corporation
 *           2003       Kai Germaschewski
 *
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 */

#include "modpost.h"

/* We use the ELF typedefs for kernel_ulong_t but bite the bullet and
 * use either stdint.h or inttypes.h for the rest. */
#if KERNEL_ELFCLASS == ELFCLASS32
typedef Elf32_Addr	kernel_ulong_t;
#else
typedef Elf64_Addr	kernel_ulong_t;
#endif
#ifdef __sun__
#include <inttypes.h>
#else
#include <stdint.h>
#endif

typedef uint32_t	__u32;
typedef uint16_t	__u16;
typedef unsigned char	__u8;

/* Big exception to the "don't include kernel headers into userspace, which
 * even potentially has different endianness and word sizes, since 
 * we handle those differences explicitly below */
#include "../../include/linux/mod_devicetable.h"

#define ADD(str, sep, cond, field)                              \
do {                                                            \
        strcat(str, sep);                                       \
        if (cond)                                               \
                sprintf(str + strlen(str),                      \
                        sizeof(field) == 1 ? "%02X" :           \
                        sizeof(field) == 2 ? "%04X" :           \
                        sizeof(field) == 4 ? "%08X" : "",       \
                        field);                                 \
        else                                                    \
                sprintf(str + strlen(str), "*");                \
} while(0)

/* USB is special because the bcdDevice can be matched against a numeric range */
/* Looks like "usb:vNpNdNdcNdscNdpNicNiscNipN" */
static void do_usb_entry(struct usb_device_id *id,
			 unsigned int bcdDevice_initial, int bcdDevice_initial_digits,
			 unsigned char range_lo, unsigned char range_hi,
			 struct module *mod)
{
	char alias[500];
	strcpy(alias, "usb:");
	ADD(alias, "v", id->match_flags&USB_DEVICE_ID_MATCH_VENDOR,
	    id->idVendor);
	ADD(alias, "p", id->match_flags&USB_DEVICE_ID_MATCH_PRODUCT,
	    id->idProduct);

	strcat(alias, "d");
	if (bcdDevice_initial_digits)
		sprintf(alias + strlen(alias), "%0*X",
			bcdDevice_initial_digits, bcdDevice_initial);
	if (range_lo == range_hi)
		sprintf(alias + strlen(alias), "%u", range_lo);
	else if (range_lo > 0 || range_hi < 9)
		sprintf(alias + strlen(alias), "[%u-%u]", range_lo, range_hi);
	if (bcdDevice_initial_digits < (sizeof(id->bcdDevice_lo) * 2 - 1))
		strcat(alias, "*");

	ADD(alias, "dc", id->match_flags&USB_DEVICE_ID_MATCH_DEV_CLASS,
	    id->bDeviceClass);
	ADD(alias, "dsc",
	    id->match_flags&USB_DEVICE_ID_MATCH_DEV_SUBCLASS,
	    id->bDeviceSubClass);
	ADD(alias, "dp",
	    id->match_flags&USB_DEVICE_ID_MATCH_DEV_PROTOCOL,
	    id->bDeviceProtocol);
	ADD(alias, "ic",
	    id->match_flags&USB_DEVICE_ID_MATCH_INT_CLASS,
	    id->bInterfaceClass);
	ADD(alias, "isc",
	    id->match_flags&USB_DEVICE_ID_MATCH_INT_SUBCLASS,
	    id->bInterfaceSubClass);
	ADD(alias, "ip",
	    id->match_flags&USB_DEVICE_ID_MATCH_INT_PROTOCOL,
	    id->bInterfaceProtocol);

	/* Always end in a wildcard, for future extension */
	if (alias[strlen(alias)-1] != '*')
		strcat(alias, "*");
	buf_printf(&mod->dev_table_buf,
		   "MODULE_ALIAS(\"%s\");\n", alias);
}

static void do_usb_entry_multi(struct usb_device_id *id, struct module *mod)
{
	unsigned int devlo, devhi;
	unsigned char chi, clo;
	int ndigits;

	id->match_flags = TO_NATIVE(id->match_flags);
	id->idVendor = TO_NATIVE(id->idVendor);
	id->idProduct = TO_NATIVE(id->idProduct);

	devlo = id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO ?
		TO_NATIVE(id->bcdDevice_lo) : 0x0U;
	devhi = id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI ?
		TO_NATIVE(id->bcdDevice_hi) : ~0x0U;

	/*
	 * Some modules (visor) have empty slots as placeholder for
	 * run-time specification that results in catch-all alias
	 */
	if (!(id->idVendor | id->bDeviceClass | id->bInterfaceClass))
		return;

	/* Convert numeric bcdDevice range into fnmatch-able pattern(s) */
	for (ndigits = sizeof(id->bcdDevice_lo) * 2 - 1; devlo <= devhi; ndigits--) {
		clo = devlo & 0xf;
		chi = devhi & 0xf;
		if (chi > 9)	/* it's bcd not hex */
			chi = 9;
		devlo >>= 4;
		devhi >>= 4;

		if (devlo == devhi || !ndigits) {
			do_usb_entry(id, devlo, ndigits, clo, chi, mod);
			break;
		}

		if (clo > 0)
			do_usb_entry(id, devlo++, ndigits, clo, 9, mod);

		if (chi < 9)
			do_usb_entry(id, devhi--, ndigits, 0, chi, mod);
	}
}

static void do_usb_table(void *symval, unsigned long size,
			 struct module *mod)
{
	unsigned int i;
	const unsigned long id_size = sizeof(struct usb_device_id);

	if (size % id_size || size < id_size) {
		fprintf(stderr, "*** Warning: %s ids %lu bad size "
			"(each on %lu)\n", mod->name, size, id_size);
	}
	/* Leave last one: it's the terminator. */
	size -= id_size;

	for (i = 0; i < size; i += id_size)
		do_usb_entry_multi(symval + i, mod);
}

/* Looks like: ieee1394:venNmoNspNverN */
static int do_ieee1394_entry(const char *filename,
			     struct ieee1394_device_id *id, char *alias)
{
	id->match_flags = TO_NATIVE(id->match_flags);
	id->vendor_id = TO_NATIVE(id->vendor_id);
	id->model_id = TO_NATIVE(id->model_id);
	id->specifier_id = TO_NATIVE(id->specifier_id);
	id->version = TO_NATIVE(id->version);

	strcpy(alias, "ieee1394:");
	ADD(alias, "ven", id->match_flags & IEEE1394_MATCH_VENDOR_ID,
	    id->vendor_id);
	ADD(alias, "mo", id->match_flags & IEEE1394_MATCH_MODEL_ID,
	    id->model_id);
	ADD(alias, "sp", id->match_flags & IEEE1394_MATCH_SPECIFIER_ID,
	    id->specifier_id);
	ADD(alias, "ver", id->match_flags & IEEE1394_MATCH_VERSION,
	    id->version);

	return 1;
}

/* Looks like: pci:vNdNsvNsdNbcNscNiN. */
static int do_pci_entry(const char *filename,
			struct pci_device_id *id, char *alias)
{
	/* Class field can be divided into these three. */
	unsigned char baseclass, subclass, interface,
		baseclass_mask, subclass_mask, interface_mask;

	id->vendor = TO_NATIVE(id->vendor);
	id->device = TO_NATIVE(id->device);
	id->subvendor = TO_NATIVE(id->subvendor);
	id->subdevice = TO_NATIVE(id->subdevice);
	id->class = TO_NATIVE(id->class);
	id->class_mask = TO_NATIVE(id->class_mask);

	strcpy(alias, "pci:");
	ADD(alias, "v", id->vendor != PCI_ANY_ID, id->vendor);
	ADD(alias, "d", id->device != PCI_ANY_ID, id->device);
	ADD(alias, "sv", id->subvendor != PCI_ANY_ID, id->subvendor);
	ADD(alias, "sd", id->subdevice != PCI_ANY_ID, id->subdevice);

	baseclass = (id->class) >> 16;
	baseclass_mask = (id->class_mask) >> 16;
	subclass = (id->class) >> 8;
	subclass_mask = (id->class_mask) >> 8;
	interface = id->class;
	interface_mask = id->class_mask;

	if ((baseclass_mask != 0 && baseclass_mask != 0xFF)
	    || (subclass_mask != 0 && subclass_mask != 0xFF)
	    || (interface_mask != 0 && interface_mask != 0xFF)) {
		fprintf(stderr,
			"*** Warning: Can't handle masks in %s:%04X\n",
			filename, id->class_mask);
		return 0;
	}

	ADD(alias, "bc", baseclass_mask == 0xFF, baseclass);
	ADD(alias, "sc", subclass_mask == 0xFF, subclass);
	ADD(alias, "i", interface_mask == 0xFF, interface);
	return 1;
}

/* looks like: "ccw:tNmNdtNdmN" */ 
static int do_ccw_entry(const char *filename,
			struct ccw_device_id *id, char *alias)
{
	id->match_flags = TO_NATIVE(id->match_flags);
	id->cu_type = TO_NATIVE(id->cu_type);
	id->cu_model = TO_NATIVE(id->cu_model);
	id->dev_type = TO_NATIVE(id->dev_type);
	id->dev_model = TO_NATIVE(id->dev_model);

	strcpy(alias, "ccw:");
	ADD(alias, "t", id->match_flags&CCW_DEVICE_ID_MATCH_CU_TYPE,
	    id->cu_type);
	ADD(alias, "m", id->match_flags&CCW_DEVICE_ID_MATCH_CU_MODEL,
	    id->cu_model);
	ADD(alias, "dt", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE,
	    id->dev_type);
	ADD(alias, "dm", id->match_flags&CCW_DEVICE_ID_MATCH_DEVICE_TYPE,
	    id->dev_model);
	return 1;
}

/* Looks like: "serio:tyNprNidNexN" */
static int do_serio_entry(const char *filename,
			  struct serio_device_id *id, char *alias)
{
	id->type = TO_NATIVE(id->type);
	id->proto = TO_NATIVE(id->proto);
	id->id = TO_NATIVE(id->id);
	id->extra = TO_NATIVE(id->extra);

	strcpy(alias, "serio:");
	ADD(alias, "ty", id->type != SERIO_ANY, id->type);
	ADD(alias, "pr", id->proto != SERIO_ANY, id->proto);
	ADD(alias, "id", id->id != SERIO_ANY, id->id);
	ADD(alias, "ex", id->extra != SERIO_ANY, id->extra);

	return 1;
}

/* looks like: "pnp:dD" */
static int do_pnp_entry(const char *filename,
			struct pnp_device_id *id, char *alias)
{
	sprintf(alias, "pnp:d%s", id->id);
	return 1;
}

/* looks like: "pnp:cCdD..." */
static int do_pnp_card_entry(const char *filename,
			struct pnp_card_device_id *id, char *alias)
{
	int i;

	sprintf(alias, "pnp:c%s", id->id);
	for (i = 0; i < PNP_MAX_DEVICES; i++) {
		if (! *id->devs[i].id)
			break;
		sprintf(alias + strlen(alias), "d%s", id->devs[i].id);
	}
	return 1;
}

/* Looks like: pcmcia:mNcNfNfnNpfnNvaNvbNvcNvdN. */
static int do_pcmcia_entry(const char *filename,
			   struct pcmcia_device_id *id, char *alias)
{
	unsigned int i;

	id->manf_id = TO_NATIVE(id->manf_id);
	id->card_id = TO_NATIVE(id->card_id);
	id->func_id = TO_NATIVE(id->func_id);
	id->function = TO_NATIVE(id->function);
	id->device_no = TO_NATIVE(id->device_no);
	for (i=0; i<4; i++) {
		id->prod_id_hash[i] = TO_NATIVE(id->prod_id_hash[i]);
       }

       strcpy(alias, "pcmcia:");
       ADD(alias, "m", id->match_flags & PCMCIA_DEV_ID_MATCH_MANF_ID,
	   id->manf_id);
       ADD(alias, "c", id->match_flags & PCMCIA_DEV_ID_MATCH_CARD_ID,
	   id->card_id);
       ADD(alias, "f", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNC_ID,
	   id->func_id);
       ADD(alias, "fn", id->match_flags & PCMCIA_DEV_ID_MATCH_FUNCTION,
	   id->function);
       ADD(alias, "pfn", id->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO,
	   id->device_no);
       ADD(alias, "pa", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID1, id->prod_id_hash[0]);
       ADD(alias, "pb", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID2, id->prod_id_hash[1]);
       ADD(alias, "pc", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID3, id->prod_id_hash[2]);
       ADD(alias, "pd", id->match_flags & PCMCIA_DEV_ID_MATCH_PROD_ID4, id->prod_id_hash[3]);

       return 1;
}



/* Ignore any prefix, eg. v850 prepends _ */
static inline int sym_is(const char *symbol, const char *name)
{
	const char *match;

	match = strstr(symbol, name);
	if (!match)
		return 0;
	return match[strlen(symbol)] == '\0';
}

static void do_table(void *symval, unsigned long size,
		     unsigned long id_size,
		     void *function,
		     struct module *mod)
{
	unsigned int i;
	char alias[500];
	int (*do_entry)(const char *, void *entry, char *alias) = function;

	if (size % id_size || size < id_size) {
		fprintf(stderr, "*** Warning: %s ids %lu bad size "
			"(each on %lu)\n", mod->name, size, id_size);
	}
	/* Leave last one: it's the terminator. */
	size -= id_size;

	for (i = 0; i < size; i += id_size) {
		if (do_entry(mod->name, symval+i, alias)) {
			/* Always end in a wildcard, for future extension */
			if (alias[strlen(alias)-1] != '*')
				strcat(alias, "*");
			buf_printf(&mod->dev_table_buf,
				   "MODULE_ALIAS(\"%s\");\n", alias);
		}
	}
}

/* Create MODULE_ALIAS() statements.
 * At this time, we cannot write the actual output C source yet,
 * so we write into the mod->dev_table_buf buffer. */
void handle_moddevtable(struct module *mod, struct elf_info *info,
			Elf_Sym *sym, const char *symname)
{
	void *symval;

	/* We're looking for a section relative symbol */
	if (!sym->st_shndx || sym->st_shndx >= info->hdr->e_shnum)
		return;

	symval = (void *)info->hdr
		+ info->sechdrs[sym->st_shndx].sh_offset
		+ sym->st_value;

	if (sym_is(symname, "__mod_pci_device_table"))
		do_table(symval, sym->st_size, sizeof(struct pci_device_id),
			 do_pci_entry, mod);
	else if (sym_is(symname, "__mod_usb_device_table"))
		/* special case to handle bcdDevice ranges */
		do_usb_table(symval, sym->st_size, mod);
	else if (sym_is(symname, "__mod_ieee1394_device_table"))
		do_table(symval, sym->st_size, sizeof(struct ieee1394_device_id),
			 do_ieee1394_entry, mod);
	else if (sym_is(symname, "__mod_ccw_device_table"))
		do_table(symval, sym->st_size, sizeof(struct ccw_device_id),
			 do_ccw_entry, mod);
	else if (sym_is(symname, "__mod_serio_device_table"))
		do_table(symval, sym->st_size, sizeof(struct serio_device_id),
			 do_serio_entry, mod);
	else if (sym_is(symname, "__mod_pnp_device_table"))
		do_table(symval, sym->st_size, sizeof(struct pnp_device_id),
			 do_pnp_entry, mod);
	else if (sym_is(symname, "__mod_pnp_card_device_table"))
		do_table(symval, sym->st_size, sizeof(struct pnp_card_device_id),
			 do_pnp_card_entry, mod);
	else if (sym_is(symname, "__mod_pcmcia_device_table"))
		do_table(symval, sym->st_size, sizeof(struct pcmcia_device_id),
			 do_pcmcia_entry, mod);
}

/* Now add out buffered information to the generated C source */
void add_moddevtable(struct buffer *buf, struct module *mod)
{
	buf_printf(buf, "\n");
	buf_write(buf, mod->dev_table_buf.p, mod->dev_table_buf.pos);
	free(mod->dev_table_buf.p);
}
OpenPOWER on IntegriCloud