aboutsummaryrefslogtreecommitdiffstats
path: root/buildtools/pmdinfogen/pmdinfogen.c
blob: 79bb343af591dcc73184967bb83a4bcbb149d550 (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
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
/* Postprocess pmd object files to export hw support
 *
 * Copyright 2016 Neil Horman <nhorman@tuxdriver.com>
 * Based in part on modpost.c from the linux kernel
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License V2, incorporated herein by reference.
 *
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <limits.h>
#include <stdbool.h>
#include <errno.h>
#include <libgen.h>

#include <rte_common.h>
#include "pmdinfogen.h"

#ifdef RTE_ARCH_64
#define ADDR_SIZE 64
#else
#define ADDR_SIZE 32
#endif


static const char *sym_name(struct elf_info *elf, Elf_Sym *sym)
{
	if (sym)
		return elf->strtab + sym->st_name;
	else
		return "(unknown)";
}

static void *grab_file(const char *filename, unsigned long *size)
{
	struct stat st;
	void *map = MAP_FAILED;
	int fd;

	fd = open(filename, O_RDONLY);
	if (fd < 0)
		return NULL;
	if (fstat(fd, &st))
		goto failed;

	*size = st.st_size;
	map = mmap(NULL, *size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);

failed:
	close(fd);
	if (map == MAP_FAILED)
		return NULL;
	return map;
}

/**
  * Return a copy of the next line in a mmap'ed file.
  * spaces in the beginning of the line is trimmed away.
  * Return a pointer to a static buffer.
  **/
static void release_file(void *file, unsigned long size)
{
	munmap(file, size);
}


static void *get_sym_value(struct elf_info *info, const Elf_Sym *sym)
{
	return RTE_PTR_ADD(info->hdr,
		info->sechdrs[sym->st_shndx].sh_offset + sym->st_value);
}

static Elf_Sym *find_sym_in_symtab(struct elf_info *info,
				   const char *name, Elf_Sym *last)
{
	Elf_Sym *idx;
	if (last)
		idx = last+1;
	else
		idx = info->symtab_start;

	for (; idx < info->symtab_stop; idx++) {
		const char *n = sym_name(info, idx);
		if (!strncmp(n, name, strlen(name)))
			return idx;
	}
	return NULL;
}

static int parse_elf(struct elf_info *info, const char *filename)
{
	unsigned int i;
	Elf_Ehdr *hdr;
	Elf_Shdr *sechdrs;
	Elf_Sym  *sym;
	int endian;
	unsigned int symtab_idx = ~0U, symtab_shndx_idx = ~0U;

	hdr = grab_file(filename, &info->size);
	if (!hdr) {
		perror(filename);
		exit(1);
	}
	info->hdr = hdr;
	if (info->size < sizeof(*hdr)) {
		/* file too small, assume this is an empty .o file */
		return 0;
	}
	/* Is this a valid ELF file? */
	if ((hdr->e_ident[EI_MAG0] != ELFMAG0) ||
	    (hdr->e_ident[EI_MAG1] != ELFMAG1) ||
	    (hdr->e_ident[EI_MAG2] != ELFMAG2) ||
	    (hdr->e_ident[EI_MAG3] != ELFMAG3)) {
		/* Not an ELF file - silently ignore it */
		return 0;
	}

	if (!hdr->e_ident[EI_DATA]) {
		/* Unknown endian */
		return 0;
	}

	endian = hdr->e_ident[EI_DATA];

	/* Fix endianness in ELF header */
	hdr->e_type      = TO_NATIVE(endian, 16, hdr->e_type);
	hdr->e_machine   = TO_NATIVE(endian, 16, hdr->e_machine);
	hdr->e_version   = TO_NATIVE(endian, 32, hdr->e_version);
	hdr->e_entry     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_entry);
	hdr->e_phoff     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_phoff);
	hdr->e_shoff     = TO_NATIVE(endian, ADDR_SIZE, hdr->e_shoff);
	hdr->e_flags     = TO_NATIVE(endian, 32, hdr->e_flags);
	hdr->e_ehsize    = TO_NATIVE(endian, 16, hdr->e_ehsize);
	hdr->e_phentsize = TO_NATIVE(endian, 16, hdr->e_phentsize);
	hdr->e_phnum     = TO_NATIVE(endian, 16, hdr->e_phnum);
	hdr->e_shentsize = TO_NATIVE(endian, 16, hdr->e_shentsize);
	hdr->e_shnum     = TO_NATIVE(endian, 16, hdr->e_shnum);
	hdr->e_shstrndx  = TO_NATIVE(endian, 16, hdr->e_shstrndx);

	sechdrs = RTE_PTR_ADD(hdr, hdr->e_shoff);
	info->sechdrs = sechdrs;

	/* Check if file offset is correct */
	if (hdr->e_shoff > info->size) {
		fprintf(stderr, "section header offset=%lu in file '%s' "
		      "is bigger than filesize=%lu\n",
		      (unsigned long)hdr->e_shoff,
		      filename, info->size);
		return 0;
	}

	if (hdr->e_shnum == SHN_UNDEF) {
		/*
		 * There are more than 64k sections,
		 * read count from .sh_size.
		 */
		info->num_sections =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[0].sh_size);
	} else {
		info->num_sections = hdr->e_shnum;
	}
	if (hdr->e_shstrndx == SHN_XINDEX)
		info->secindex_strings =
			TO_NATIVE(endian, 32, sechdrs[0].sh_link);
	else
		info->secindex_strings = hdr->e_shstrndx;

	/* Fix endianness in section headers */
	for (i = 0; i < info->num_sections; i++) {
		sechdrs[i].sh_name      =
			TO_NATIVE(endian, 32, sechdrs[i].sh_name);
		sechdrs[i].sh_type      =
			TO_NATIVE(endian, 32, sechdrs[i].sh_type);
		sechdrs[i].sh_flags     =
			TO_NATIVE(endian, 32, sechdrs[i].sh_flags);
		sechdrs[i].sh_addr      =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addr);
		sechdrs[i].sh_offset    =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_offset);
		sechdrs[i].sh_size      =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_size);
		sechdrs[i].sh_link      =
			TO_NATIVE(endian, 32, sechdrs[i].sh_link);
		sechdrs[i].sh_info      =
			TO_NATIVE(endian, 32, sechdrs[i].sh_info);
		sechdrs[i].sh_addralign =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_addralign);
		sechdrs[i].sh_entsize   =
			TO_NATIVE(endian, ADDR_SIZE, sechdrs[i].sh_entsize);
	}
	/* Find symbol table. */
	for (i = 1; i < info->num_sections; i++) {
		int nobits = sechdrs[i].sh_type == SHT_NOBITS;

		if (!nobits && sechdrs[i].sh_offset > info->size) {
			fprintf(stderr, "%s is truncated. "
			      "sechdrs[i].sh_offset=%lu > sizeof(*hrd)=%zu\n",
			      filename, (unsigned long)sechdrs[i].sh_offset,
			      sizeof(*hdr));
			return 0;
		}

		if (sechdrs[i].sh_type == SHT_SYMTAB) {
			unsigned int sh_link_idx;
			symtab_idx = i;
			info->symtab_start = RTE_PTR_ADD(hdr,
				sechdrs[i].sh_offset);
			info->symtab_stop  = RTE_PTR_ADD(hdr,
				sechdrs[i].sh_offset + sechdrs[i].sh_size);
			sh_link_idx = sechdrs[i].sh_link;
			info->strtab       = RTE_PTR_ADD(hdr,
				sechdrs[sh_link_idx].sh_offset);
		}

		/* 32bit section no. table? ("more than 64k sections") */
		if (sechdrs[i].sh_type == SHT_SYMTAB_SHNDX) {
			symtab_shndx_idx = i;
			info->symtab_shndx_start = RTE_PTR_ADD(hdr,
				sechdrs[i].sh_offset);
			info->symtab_shndx_stop  = RTE_PTR_ADD(hdr,
				sechdrs[i].sh_offset + sechdrs[i].sh_size);
		}
	}
	if (!info->symtab_start)
		fprintf(stderr, "%s has no symtab?\n", filename);
	else {
		/* Fix endianness in symbols */
		for (sym = info->symtab_start; sym < info->symtab_stop; sym++) {
			sym->st_shndx = TO_NATIVE(endian, 16, sym->st_shndx);
			sym->st_name  = TO_NATIVE(endian, 32, sym->st_name);
			sym->st_value = TO_NATIVE(endian, ADDR_SIZE, sym->st_value);
			sym->st_size  = TO_NATIVE(endian, ADDR_SIZE, sym->st_size);
		}
	}

	if (symtab_shndx_idx != ~0U) {
		Elf32_Word *p;
		if (symtab_idx != sechdrs[symtab_shndx_idx].sh_link)
			fprintf(stderr,
			      "%s: SYMTAB_SHNDX has bad sh_link: %u!=%u\n",
			      filename, sechdrs[symtab_shndx_idx].sh_link,
			      symtab_idx);
		/* Fix endianness */
		for (p = info->symtab_shndx_start; p < info->symtab_shndx_stop;
		     p++)
			*p = TO_NATIVE(endian, 32, *p);
	}

	return 1;
}

static void parse_elf_finish(struct elf_info *info)
{
	struct pmd_driver *tmp, *idx = info->drivers;
	release_file(info->hdr, info->size);
	while (idx) {
		tmp = idx->next;
		free(idx);
		idx = tmp;
	}
}

struct opt_tag {
	const char *suffix;
	const char *json_id;
};

static const struct opt_tag opt_tags[] = {
	{"_param_string_export", "params"},
};

static int complete_pmd_entry(struct elf_info *info, struct pmd_driver *drv)
{
	const char *tname;
	int i;
	char tmpsymname[128];
	Elf_Sym *tmpsym;

	drv->name = get_sym_value(info, drv->name_sym);

	for (i = 0; i < PMD_OPT_MAX; i++) {
		memset(tmpsymname, 0, 128);
		sprintf(tmpsymname, "__%s%s", drv->name, opt_tags[i].suffix);
		tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);
		if (!tmpsym)
			continue;
		drv->opt_vals[i] = get_sym_value(info, tmpsym);
	}

	memset(tmpsymname, 0, 128);
	sprintf(tmpsymname, "__%s_pci_tbl_export", drv->name);

	tmpsym = find_sym_in_symtab(info, tmpsymname, NULL);


	/*
	 * If this returns NULL, then this is a PMD_VDEV, because
	 * it has no pci table reference
	 */
	if (!tmpsym) {
		drv->pci_tbl = NULL;
		return 0;
	}

	tname = get_sym_value(info, tmpsym);
	tmpsym = find_sym_in_symtab(info, tname, NULL);
	if (!tmpsym)
		return -ENOENT;

	drv->pci_tbl = (struct rte_pci_id *)get_sym_value(info, tmpsym);
	if (!drv->pci_tbl)
		return -ENOENT;

	return 0;
}

static int locate_pmd_entries(struct elf_info *info)
{
	Elf_Sym *last = NULL;
	struct pmd_driver *new;

	info->drivers = NULL;

	do {
		new = calloc(sizeof(struct pmd_driver), 1);
		if (new == NULL) {
			fprintf(stderr, "Failed to calloc memory\n");
			return -1;
		}
		new->name_sym = find_sym_in_symtab(info, "this_pmd_name", last);
		last = new->name_sym;
		if (!new->name_sym)
			free(new);
		else {
			if (complete_pmd_entry(info, new)) {
				fprintf(stderr,
					"Failed to complete pmd entry\n");
				free(new);
			} else {
				new->next = info->drivers;
				info->drivers = new;
			}
		}
	} while (last);

	return 0;
}

static void output_pmd_info_string(struct elf_info *info, char *outfile)
{
	FILE *ofd;
	struct pmd_driver *drv;
	struct rte_pci_id *pci_ids;
	int idx = 0;

	ofd = fopen(outfile, "w+");
	if (!ofd) {
		fprintf(stderr, "Unable to open output file\n");
		return;
	}

	drv = info->drivers;

	while (drv) {
		fprintf(ofd, "const char %s_pmd_info[] __attribute__((used)) = "
			"\"PMD_INFO_STRING= {",
			drv->name);
		fprintf(ofd, "\\\"name\\\" : \\\"%s\\\", ", drv->name);

		for (idx = 0; idx < PMD_OPT_MAX; idx++) {
			if (drv->opt_vals[idx])
				fprintf(ofd, "\\\"%s\\\" : \\\"%s\\\", ",
					opt_tags[idx].json_id,
					drv->opt_vals[idx]);
		}

		pci_ids = drv->pci_tbl;
		fprintf(ofd, "\\\"pci_ids\\\" : [");

		while (pci_ids && pci_ids->device_id) {
			fprintf(ofd, "[%d, %d, %d, %d]",
				pci_ids->vendor_id, pci_ids->device_id,
				pci_ids->subsystem_vendor_id,
				pci_ids->subsystem_device_id);
			pci_ids++;
			if (pci_ids->device_id)
				fprintf(ofd, ",");
			else
				fprintf(ofd, " ");
		}
		fprintf(ofd, "]}\";\n");
		drv = drv->next;
	}

	fclose(ofd);
}

int main(int argc, char **argv)
{
	struct elf_info info;
	int rc = 1;

	if (argc < 3) {
		fprintf(stderr,
			"usage: %s <object file> <c output file>\n",
			basename(argv[0]));
		exit(127);
	}
	parse_elf(&info, argv[1]);

	if (locate_pmd_entries(&info) < 0)
		exit(1);

	if (info.drivers) {
		output_pmd_info_string(&info, argv[2]);
		rc = 0;
	} else {
		fprintf(stderr, "No drivers registered\n");
	}

	parse_elf_finish(&info);
	exit(rc);
}