blob: 8d3fef40279a5bdaf6ee48d6137f18be06d3a013 [file] [log] [blame]
Simon Glass1043d0a2015-06-23 15:38:28 -06001/*
2 * Copyright (c) 2013, Google Inc.
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 *
7 * Perform a grep of an FDT either displaying the source subset or producing
8 * a new .dtb subset which can be used as required.
9 */
10
11#include <assert.h>
12#include <ctype.h>
13#include <getopt.h>
14#include <stdio.h>
15#include <stdlib.h>
16#include <string.h>
17#include <unistd.h>
18
19#include <../include/libfdt.h>
20#include <libfdt_internal.h>
21
22/* Define DEBUG to get some debugging output on stderr */
23#ifdef DEBUG
24#define debug(a, b...) fprintf(stderr, a, ## b)
25#else
26#define debug(a, b...)
27#endif
28
29/* A linked list of values we are grepping for */
30struct value_node {
31 int type; /* Types this value matches (FDT_IS... mask) */
32 int include; /* 1 to include matches, 0 to exclude */
33 const char *string; /* String to match */
34 struct value_node *next; /* Pointer to next node, or NULL */
35};
36
37/* Output formats we support */
38enum output_t {
39 OUT_DTS, /* Device tree source */
40 OUT_DTB, /* Valid device tree binary */
41 OUT_BIN, /* Fragment of .dtb, for hashing */
42};
43
44/* Holds information which controls our output and options */
45struct display_info {
46 enum output_t output; /* Output format */
47 int add_aliases; /* Add aliases node to output */
48 int all; /* Display all properties/nodes */
49 int colour; /* Display output in ANSI colour */
50 int region_list; /* Output a region list */
51 int flags; /* Flags (FDT_REG_...) */
52 int list_strings; /* List strings in string table */
53 int show_offset; /* Show offset */
54 int show_addr; /* Show address */
55 int header; /* Output an FDT header */
56 int diff; /* Show +/- diff markers */
57 int include_root; /* Include the root node and all properties */
58 int remove_strings; /* Remove unused strings */
59 int show_dts_version; /* Put '/dts-v1/;' on the first line */
60 int types_inc; /* Mask of types that we include (FDT_IS...) */
61 int types_exc; /* Mask of types that we exclude (FDT_IS...) */
62 int invert; /* Invert polarity of match */
63 struct value_node *value_head; /* List of values to match */
64 const char *output_fname; /* Output filename */
65 FILE *fout; /* File to write dts/dtb output */
66};
67
68static void report_error(const char *where, int err)
69{
70 fprintf(stderr, "Error at '%s': %s\n", where, fdt_strerror(err));
71}
72
73/* Supported ANSI colours */
74enum {
75 COL_BLACK,
76 COL_RED,
77 COL_GREEN,
78 COL_YELLOW,
79 COL_BLUE,
80 COL_MAGENTA,
81 COL_CYAN,
82 COL_WHITE,
83
84 COL_NONE = -1,
85};
86
87/**
88 * print_ansi_colour() - Print out the ANSI sequence for a colour
89 *
90 * @fout: Output file
91 * @col: Colour to output (COL_...), or COL_NONE to reset colour
92 */
93static void print_ansi_colour(FILE *fout, int col)
94{
95 if (col == COL_NONE)
96 fprintf(fout, "\033[0m");
97 else
98 fprintf(fout, "\033[1;%dm", col + 30);
99}
100
101
102/**
103 * value_add() - Add a new value to our list of things to grep for
104 *
105 * @disp: Display structure, holding info about our options
106 * @headp: Pointer to header pointer of list
107 * @type: Type of this value (FDT_IS_...)
108 * @include: 1 if we want to include matches, 0 to exclude
109 * @str: String value to match
110 */
111static int value_add(struct display_info *disp, struct value_node **headp,
112 int type, int include, const char *str)
113{
114 struct value_node *node;
115
116 /*
117 * Keep track of which types we are excluding/including. We don't
118 * allow both including and excluding things, because it doesn't make
119 * sense. 'Including' means that everything not mentioned is
120 * excluded. 'Excluding' means that everything not mentioned is
121 * included. So using the two together would be meaningless.
122 */
123 if (include)
124 disp->types_inc |= type;
125 else
126 disp->types_exc |= type;
127 if (disp->types_inc & disp->types_exc & type) {
128 fprintf(stderr,
129 "Cannot use both include and exclude for '%s'\n", str);
130 return -1;
131 }
132
133 str = strdup(str);
134 node = malloc(sizeof(*node));
135 if (!str || !node) {
136 fprintf(stderr, "Out of memory\n");
137 return -1;
138 }
139 node->next = *headp;
140 node->type = type;
141 node->include = include;
142 node->string = str;
143 *headp = node;
144
145 return 0;
146}
147
148static bool util_is_printable_string(const void *data, int len)
149{
150 const char *s = data;
151 const char *ss, *se;
152
153 /* zero length is not */
154 if (len == 0)
155 return 0;
156
157 /* must terminate with zero */
158 if (s[len - 1] != '\0')
159 return 0;
160
161 se = s + len;
162
163 while (s < se) {
164 ss = s;
165 while (s < se && *s && isprint((unsigned char)*s))
166 s++;
167
168 /* not zero, or not done yet */
169 if (*s != '\0' || s == ss)
170 return 0;
171
172 s++;
173 }
174
175 return 1;
176}
177
178static void utilfdt_print_data(const char *data, int len)
179{
180 int i;
181 const char *p = data;
182 const char *s;
183
184 /* no data, don't print */
185 if (len == 0)
186 return;
187
188 if (util_is_printable_string(data, len)) {
189 printf(" = ");
190
191 s = data;
192 do {
193 printf("\"%s\"", s);
194 s += strlen(s) + 1;
195 if (s < data + len)
196 printf(", ");
197 } while (s < data + len);
198
199 } else if ((len % 4) == 0) {
200 const uint32_t *cell = (const uint32_t *)data;
201
202 printf(" = <");
203 for (i = 0, len /= 4; i < len; i++)
204 printf("0x%08x%s", fdt32_to_cpu(cell[i]),
205 i < (len - 1) ? " " : "");
206 printf(">");
207 } else {
208 printf(" = [");
209 for (i = 0; i < len; i++)
210 printf("%02x%s", *p++, i < len - 1 ? " " : "");
211 printf("]");
212 }
213}
214
215/**
216 * display_fdt_by_regions() - Display regions of an FDT source
217 *
218 * This dumps an FDT as source, but only certain regions of it. This is the
219 * final stage of the grep - we have a list of regions we want to display,
220 * and this function displays them.
221 *
222 * @disp: Display structure, holding info about our options
223 * @blob: FDT blob to display
224 * @region: List of regions to display
225 * @count: Number of regions
226 */
227static int display_fdt_by_regions(struct display_info *disp, const void *blob,
228 struct fdt_region region[], int count)
229{
230 struct fdt_region *reg = region, *reg_end = region + count;
231 uint32_t off_mem_rsvmap = fdt_off_mem_rsvmap(blob);
232 int base = fdt_off_dt_struct(blob);
233 int version = fdt_version(blob);
234 int offset, nextoffset;
235 int tag, depth, shift;
236 FILE *f = disp->fout;
237 uint64_t addr, size;
238 int in_region;
239 int file_ofs;
240 int i;
241
242 if (disp->show_dts_version)
243 fprintf(f, "/dts-v1/;\n");
244
245 if (disp->header) {
246 fprintf(f, "// magic:\t\t0x%x\n", fdt_magic(blob));
247 fprintf(f, "// totalsize:\t\t0x%x (%d)\n", fdt_totalsize(blob),
248 fdt_totalsize(blob));
249 fprintf(f, "// off_dt_struct:\t0x%x\n",
250 fdt_off_dt_struct(blob));
251 fprintf(f, "// off_dt_strings:\t0x%x\n",
252 fdt_off_dt_strings(blob));
253 fprintf(f, "// off_mem_rsvmap:\t0x%x\n", off_mem_rsvmap);
254 fprintf(f, "// version:\t\t%d\n", version);
255 fprintf(f, "// last_comp_version:\t%d\n",
256 fdt_last_comp_version(blob));
257 if (version >= 2) {
258 fprintf(f, "// boot_cpuid_phys:\t0x%x\n",
259 fdt_boot_cpuid_phys(blob));
260 }
261 if (version >= 3) {
262 fprintf(f, "// size_dt_strings:\t0x%x\n",
263 fdt_size_dt_strings(blob));
264 }
265 if (version >= 17) {
266 fprintf(f, "// size_dt_struct:\t0x%x\n",
267 fdt_size_dt_struct(blob));
268 }
269 fprintf(f, "\n");
270 }
271
272 if (disp->flags & FDT_REG_ADD_MEM_RSVMAP) {
273 const struct fdt_reserve_entry *p_rsvmap;
274
275 p_rsvmap = (const struct fdt_reserve_entry *)
276 ((const char *)blob + off_mem_rsvmap);
277 for (i = 0; ; i++) {
278 addr = fdt64_to_cpu(p_rsvmap[i].address);
279 size = fdt64_to_cpu(p_rsvmap[i].size);
280 if (addr == 0 && size == 0)
281 break;
282
283 fprintf(f, "/memreserve/ %llx %llx;\n",
284 (unsigned long long)addr,
285 (unsigned long long)size);
286 }
287 }
288
289 depth = 0;
290 nextoffset = 0;
291 shift = 4; /* 4 spaces per indent */
292 do {
293 const struct fdt_property *prop;
294 const char *name;
295 int show;
296 int len;
297
298 offset = nextoffset;
299
300 /*
301 * Work out the file offset of this offset, and decide
302 * whether it is in the region list or not
303 */
304 file_ofs = base + offset;
305 if (reg < reg_end && file_ofs >= reg->offset + reg->size)
306 reg++;
307 in_region = reg < reg_end && file_ofs >= reg->offset &&
308 file_ofs < reg->offset + reg->size;
309 tag = fdt_next_tag(blob, offset, &nextoffset);
310
311 if (tag == FDT_END)
312 break;
313 show = in_region || disp->all;
314 if (show && disp->diff)
315 fprintf(f, "%c", in_region ? '+' : '-');
316
317 if (!show) {
318 /* Do this here to avoid 'if (show)' in every 'case' */
319 if (tag == FDT_BEGIN_NODE)
320 depth++;
321 else if (tag == FDT_END_NODE)
322 depth--;
323 continue;
324 }
325 if (tag != FDT_END) {
326 if (disp->show_addr)
327 fprintf(f, "%4x: ", file_ofs);
328 if (disp->show_offset)
329 fprintf(f, "%4x: ", file_ofs - base);
330 }
331
332 /* Green means included, red means excluded */
333 if (disp->colour)
334 print_ansi_colour(f, in_region ? COL_GREEN : COL_RED);
335
336 switch (tag) {
337 case FDT_PROP:
338 prop = fdt_get_property_by_offset(blob, offset, NULL);
339 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
340 fprintf(f, "%*s%s", depth * shift, "", name);
341 utilfdt_print_data(prop->data,
342 fdt32_to_cpu(prop->len));
343 fprintf(f, ";");
344 break;
345
346 case FDT_NOP:
347 fprintf(f, "%*s// [NOP]", depth * shift, "");
348 break;
349
350 case FDT_BEGIN_NODE:
351 name = fdt_get_name(blob, offset, &len);
352 fprintf(f, "%*s%s {", depth++ * shift, "",
353 *name ? name : "/");
354 break;
355
356 case FDT_END_NODE:
357 fprintf(f, "%*s};", --depth * shift, "");
358 break;
359 }
360
361 /* Reset colour back to normal before end of line */
362 if (disp->colour)
363 print_ansi_colour(f, COL_NONE);
364 fprintf(f, "\n");
365 } while (1);
366
367 /* Print a list of strings if requested */
368 if (disp->list_strings) {
369 const char *str;
370 int str_base = fdt_off_dt_strings(blob);
371
372 for (offset = 0; offset < fdt_size_dt_strings(blob);
373 offset += strlen(str) + 1) {
374 str = fdt_string(blob, offset);
375 int len = strlen(str) + 1;
376 int show;
377
378 /* Only print strings that are in the region */
379 file_ofs = str_base + offset;
380 in_region = reg < reg_end &&
381 file_ofs >= reg->offset &&
382 file_ofs + len < reg->offset +
383 reg->size;
384 show = in_region || disp->all;
385 if (show && disp->diff)
386 printf("%c", in_region ? '+' : '-');
387 if (disp->show_addr)
388 printf("%4x: ", file_ofs);
389 if (disp->show_offset)
390 printf("%4x: ", offset);
391 printf("%s\n", str);
392 }
393 }
394
395 return 0;
396}
397
398/**
399 * dump_fdt_regions() - Dump regions of an FDT as binary data
400 *
401 * This dumps an FDT as binary, but only certain regions of it. This is the
402 * final stage of the grep - we have a list of regions we want to dump,
403 * and this function dumps them.
404 *
405 * The output of this function may or may not be a valid FDT. To ensure it
406 * is, these disp->flags must be set:
407 *
408 * FDT_REG_SUPERNODES: ensures that subnodes are preceeded by their
409 * parents. Without this option, fragments of subnode data may be
410 * output without the supernodes above them. This is useful for
411 * hashing but cannot produce a valid FDT.
412 * FDT_REG_ADD_STRING_TAB: Adds a string table to the end of the FDT.
413 * Without this none of the properties will have names
414 * FDT_REG_ADD_MEM_RSVMAP: Adds a mem_rsvmap table - an FDT is invalid
415 * without this.
416 *
417 * @disp: Display structure, holding info about our options
418 * @blob: FDT blob to display
419 * @region: List of regions to display
420 * @count: Number of regions
421 * @out: Output destination
422 */
423static int dump_fdt_regions(struct display_info *disp, const void *blob,
424 struct fdt_region region[], int count, char *out)
425{
426 struct fdt_header *fdt;
427 int size, struct_start;
428 int ptr;
429 int i;
430
431 /* Set up a basic header (even if we don't actually write it) */
432 fdt = (struct fdt_header *)out;
433 memset(fdt, '\0', sizeof(*fdt));
434 fdt_set_magic(fdt, FDT_MAGIC);
435 struct_start = FDT_ALIGN(sizeof(struct fdt_header),
436 sizeof(struct fdt_reserve_entry));
437 fdt_set_off_mem_rsvmap(fdt, struct_start);
438 fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
439 fdt_set_last_comp_version(fdt, FDT_FIRST_SUPPORTED_VERSION);
440
441 /*
442 * Calculate the total size of the regions we are writing out. The
443 * first will be the mem_rsvmap if the FDT_REG_ADD_MEM_RSVMAP flag
444 * is set. The last will be the string table if FDT_REG_ADD_STRING_TAB
445 * is set.
446 */
447 for (i = size = 0; i < count; i++)
448 size += region[i].size;
449
450 /* Bring in the mem_rsvmap section from the old file if requested */
451 if (count > 0 && (disp->flags & FDT_REG_ADD_MEM_RSVMAP)) {
452 struct_start += region[0].size;
453 size -= region[0].size;
454 }
455 fdt_set_off_dt_struct(fdt, struct_start);
456
457 /* Update the header to have the correct offsets/sizes */
458 if (count >= 2 && (disp->flags & FDT_REG_ADD_STRING_TAB)) {
459 int str_size;
460
461 str_size = region[count - 1].size;
462 fdt_set_size_dt_struct(fdt, size - str_size);
463 fdt_set_off_dt_strings(fdt, struct_start + size - str_size);
464 fdt_set_size_dt_strings(fdt, str_size);
465 fdt_set_totalsize(fdt, struct_start + size);
466 }
467
468 /* Write the header if required */
469 ptr = 0;
470 if (disp->header) {
471 ptr = sizeof(*fdt);
472 while (ptr < fdt_off_mem_rsvmap(fdt))
473 out[ptr++] = '\0';
474 }
475
476 /* Output all the nodes including any mem_rsvmap/string table */
477 for (i = 0; i < count; i++) {
478 struct fdt_region *reg = &region[i];
479
480 memcpy(out + ptr, (const char *)blob + reg->offset, reg->size);
481 ptr += reg->size;
482 }
483
484 return ptr;
485}
486
487/**
488 * show_region_list() - Print out a list of regions
489 *
490 * The list includes the region offset (absolute offset from start of FDT
491 * blob in bytes) and size
492 *
493 * @reg: List of regions to print
494 * @count: Number of regions
495 */
496static void show_region_list(struct fdt_region *reg, int count)
497{
498 int i;
499
500 printf("Regions: %d\n", count);
501 for (i = 0; i < count; i++, reg++) {
502 printf("%d: %-10x %-10x\n", i, reg->offset,
503 reg->offset + reg->size);
504 }
505}
506
507static int check_type_include(void *priv, int type, const char *data, int size)
508{
509 struct display_info *disp = priv;
510 struct value_node *val;
511 int match, none_match = FDT_IS_ANY;
512
513 /* If none of our conditions mention this type, we know nothing */
514 debug("type=%x, data=%s\n", type, data ? data : "(null)");
515 if (!((disp->types_inc | disp->types_exc) & type)) {
516 debug(" - not in any condition\n");
517 return -1;
518 }
519
520 /*
521 * Go through the list of conditions. For inclusive conditions, we
522 * return 1 at the first match. For exclusive conditions, we must
523 * check that there are no matches.
524 */
525 for (val = disp->value_head; val; val = val->next) {
526 if (!(type & val->type))
527 continue;
528 match = fdt_stringlist_contains(data, size, val->string);
529 debug(" - val->type=%x, str='%s', match=%d\n",
530 val->type, val->string, match);
531 if (match && val->include) {
532 debug(" - match inc %s\n", val->string);
533 return 1;
534 }
535 if (match)
536 none_match &= ~val->type;
537 }
538
539 /*
540 * If this is an exclusive condition, and nothing matches, then we
541 * should return 1.
542 */
543 if ((type & disp->types_exc) && (none_match & type)) {
544 debug(" - match exc\n");
545 /*
546 * Allow FDT_IS_COMPAT to make the final decision in the
547 * case where there is no specific type
548 */
549 if (type == FDT_IS_NODE && disp->types_exc == FDT_ANY_GLOBAL) {
550 debug(" - supressed exc node\n");
551 return -1;
552 }
553 return 1;
554 }
555
556 /*
557 * Allow FDT_IS_COMPAT to make the final decision in the
558 * case where there is no specific type (inclusive)
559 */
560 if (type == FDT_IS_NODE && disp->types_inc == FDT_ANY_GLOBAL)
561 return -1;
562
563 debug(" - no match, types_inc=%x, types_exc=%x, none_match=%x\n",
564 disp->types_inc, disp->types_exc, none_match);
565
566 return 0;
567}
568
569/**
570 * h_include() - Include handler function for fdt_find_regions()
571 *
572 * This function decides whether to include or exclude a node, property or
573 * compatible string. The function is defined by fdt_find_regions().
574 *
575 * The algorithm is documented in the code - disp->invert is 0 for normal
576 * operation, and 1 to invert the sense of all matches.
577 *
578 * See
579 */
580static int h_include(void *priv, const void *fdt, int offset, int type,
581 const char *data, int size)
582{
583 struct display_info *disp = priv;
584 int inc, len;
585
586 inc = check_type_include(priv, type, data, size);
587 if (disp->include_root && type == FDT_IS_PROP && offset == 0 && inc)
588 return 1;
589
590 /*
591 * If the node name does not tell us anything, check the
592 * compatible string
593 */
594 if (inc == -1 && type == FDT_IS_NODE) {
595 debug(" - checking compatible2\n");
596 data = fdt_getprop(fdt, offset, "compatible", &len);
597 inc = check_type_include(priv, FDT_IS_COMPAT, data, len);
598 }
599
600 /* If we still have no idea, check for properties in the node */
601 if (inc != 1 && type == FDT_IS_NODE &&
602 (disp->types_inc & FDT_NODE_HAS_PROP)) {
603 debug(" - checking node '%s'\n",
604 fdt_get_name(fdt, offset, NULL));
605 for (offset = fdt_first_property_offset(fdt, offset);
606 offset > 0 && inc != 1;
607 offset = fdt_next_property_offset(fdt, offset)) {
608 const struct fdt_property *prop;
609 const char *str;
610
611 prop = fdt_get_property_by_offset(fdt, offset, NULL);
612 if (!prop)
613 continue;
614 str = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
615 inc = check_type_include(priv, FDT_NODE_HAS_PROP, str,
616 strlen(str));
617 }
618 if (inc == -1)
619 inc = 0;
620 }
621
622 switch (inc) {
623 case 1:
624 inc = !disp->invert;
625 break;
626 case 0:
627 inc = disp->invert;
628 break;
629 }
630 debug(" - returning %d\n", inc);
631
632 return inc;
633}
634
635static int h_cmp_region(const void *v1, const void *v2)
636{
637 const struct fdt_region *region1 = v1, *region2 = v2;
638
639 return region1->offset - region2->offset;
640}
641
642static int fdtgrep_find_regions(const void *fdt,
643 int (*include_func)(void *priv, const void *fdt, int offset,
644 int type, const char *data, int size),
645 struct display_info *disp, struct fdt_region *region,
646 int max_regions, char *path, int path_len, int flags)
647{
648 struct fdt_region_state state;
649 int count;
650 int ret;
651
652 count = 0;
653 ret = fdt_first_region(fdt, include_func, disp,
654 &region[count++], path, path_len,
655 disp->flags, &state);
656 while (ret == 0) {
657 ret = fdt_next_region(fdt, include_func, disp,
658 count < max_regions ? &region[count] : NULL,
659 path, path_len, disp->flags, &state);
660 if (!ret)
661 count++;
662 }
Simon Glass9404fc82016-03-06 19:45:32 -0700663 if (ret && ret != -FDT_ERR_NOTFOUND)
664 return ret;
Simon Glass1043d0a2015-06-23 15:38:28 -0600665
666 /* Find all the aliases and add those regions back in */
667 if (disp->add_aliases && count < max_regions) {
668 int new_count;
669
670 new_count = fdt_add_alias_regions(fdt, region, count,
671 max_regions, &state);
Simon Glass9404fc82016-03-06 19:45:32 -0700672 if (new_count == -FDT_ERR_NOTFOUND) {
673 /* No alias node found */
674 } else if (new_count < 0) {
675 return new_count;
676 } else if (new_count <= max_regions) {
Simon Glassf4039142015-10-17 19:41:16 -0600677 /*
678 * The alias regions will now be at the end of the list.
679 * Sort the regions by offset to get things into the
680 * right order
681 */
682 count = new_count;
683 qsort(region, count, sizeof(struct fdt_region),
684 h_cmp_region);
Simon Glass1043d0a2015-06-23 15:38:28 -0600685 }
Simon Glass1043d0a2015-06-23 15:38:28 -0600686 }
687
Simon Glass1043d0a2015-06-23 15:38:28 -0600688 return count;
689}
690
691int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len)
692{
693 int fd = 0; /* assume stdin */
694 char *buf = NULL;
695 off_t bufsize = 1024, offset = 0;
696 int ret = 0;
697
698 *buffp = NULL;
699 if (strcmp(filename, "-") != 0) {
700 fd = open(filename, O_RDONLY);
701 if (fd < 0)
702 return errno;
703 }
704
705 /* Loop until we have read everything */
706 buf = malloc(bufsize);
707 if (!buf)
708 return -ENOMEM;
709 do {
710 /* Expand the buffer to hold the next chunk */
711 if (offset == bufsize) {
712 bufsize *= 2;
713 buf = realloc(buf, bufsize);
714 if (!buf)
715 return -ENOMEM;
716 }
717
718 ret = read(fd, &buf[offset], bufsize - offset);
719 if (ret < 0) {
720 ret = errno;
721 break;
722 }
723 offset += ret;
724 } while (ret != 0);
725
726 /* Clean up, including closing stdin; return errno on error */
727 close(fd);
728 if (ret)
729 free(buf);
730 else
731 *buffp = buf;
732 *len = bufsize;
733 return ret;
734}
735
736int utilfdt_read_err(const char *filename, char **buffp)
737{
738 off_t len;
739 return utilfdt_read_err_len(filename, buffp, &len);
740}
741
742char *utilfdt_read_len(const char *filename, off_t *len)
743{
744 char *buff;
745 int ret = utilfdt_read_err_len(filename, &buff, len);
746
747 if (ret) {
748 fprintf(stderr, "Couldn't open blob from '%s': %s\n", filename,
749 strerror(ret));
750 return NULL;
751 }
752 /* Successful read */
753 return buff;
754}
755
756char *utilfdt_read(const char *filename)
757{
758 off_t len;
759 return utilfdt_read_len(filename, &len);
760}
761
762/**
763 * Run the main fdtgrep operation, given a filename and valid arguments
764 *
765 * @param disp Display information / options
766 * @param filename Filename of blob file
767 * @param return 0 if ok, -ve on error
768 */
769static int do_fdtgrep(struct display_info *disp, const char *filename)
770{
771 struct fdt_region *region;
772 int max_regions;
773 int count = 100;
774 char path[1024];
775 char *blob;
776 int i, ret;
777
778 blob = utilfdt_read(filename);
779 if (!blob)
780 return -1;
781 ret = fdt_check_header(blob);
782 if (ret) {
783 fprintf(stderr, "Error: %s\n", fdt_strerror(ret));
784 return ret;
785 }
786
787 /* Allow old files, but they are untested */
788 if (fdt_version(blob) < 17 && disp->value_head) {
789 fprintf(stderr,
790 "Warning: fdtgrep does not fully support version %d files\n",
791 fdt_version(blob));
792 }
793
794 /*
795 * We do two passes, since we don't know how many regions we need.
796 * The first pass will count the regions, but if it is too many,
797 * we do another pass to actually record them.
798 */
Simon Glassf4039142015-10-17 19:41:16 -0600799 for (i = 0; i < 3; i++) {
Simon Glass1043d0a2015-06-23 15:38:28 -0600800 region = malloc(count * sizeof(struct fdt_region));
801 if (!region) {
802 fprintf(stderr, "Out of memory for %d regions\n",
803 count);
804 return -1;
805 }
806 max_regions = count;
807 count = fdtgrep_find_regions(blob,
808 h_include, disp,
809 region, max_regions, path, sizeof(path),
810 disp->flags);
811 if (count < 0) {
812 report_error("fdt_find_regions", count);
Simon Glass9404fc82016-03-06 19:45:32 -0700813 if (count == -FDT_ERR_BADLAYOUT)
814 fprintf(stderr,
815 "/aliases node must come before all other nodes\n");
Simon Glass1043d0a2015-06-23 15:38:28 -0600816 return -1;
817 }
818 if (count <= max_regions)
819 break;
820 free(region);
821 }
822
823 /* Optionally print a list of regions */
824 if (disp->region_list)
825 show_region_list(region, count);
826
827 /* Output either source .dts or binary .dtb */
828 if (disp->output == OUT_DTS) {
829 ret = display_fdt_by_regions(disp, blob, region, count);
830 } else {
831 void *fdt;
832 /* Allow reserved memory section to expand slightly */
833 int size = fdt_totalsize(blob) + 16;
834
835 fdt = malloc(size);
836 if (!fdt) {
837 fprintf(stderr, "Out_of_memory\n");
838 ret = -1;
839 goto err;
840 }
841 size = dump_fdt_regions(disp, blob, region, count, fdt);
842 if (disp->remove_strings) {
843 void *out;
844
845 out = malloc(size);
846 if (!out) {
847 fprintf(stderr, "Out_of_memory\n");
848 ret = -1;
849 goto err;
850 }
851 ret = fdt_remove_unused_strings(fdt, out);
852 if (ret < 0) {
853 fprintf(stderr,
854 "Failed to remove unused strings: err=%d\n",
855 ret);
856 goto err;
857 }
858 free(fdt);
859 fdt = out;
860 ret = fdt_pack(fdt);
861 if (ret < 0) {
862 fprintf(stderr, "Failed to pack: err=%d\n",
863 ret);
864 goto err;
865 }
866 size = fdt_totalsize(fdt);
867 }
868
869 if (size != fwrite(fdt, 1, size, disp->fout)) {
870 fprintf(stderr, "Write failure, %d bytes\n", size);
871 free(fdt);
872 ret = 1;
873 goto err;
874 }
875 free(fdt);
876 }
877err:
878 free(blob);
879 free(region);
880
881 return ret;
882}
883
884static const char usage_synopsis[] =
885 "fdtgrep - extract portions from device tree\n"
886 "\n"
887 "Usage:\n"
888 " fdtgrep <options> <dt file>|-\n\n"
889 "Output formats are:\n"
890 "\tdts - device tree soure text\n"
891 "\tdtb - device tree blob (sets -Hmt automatically)\n"
892 "\tbin - device tree fragment (may not be a valid .dtb)";
893
894/* Helper for usage_short_opts string constant */
895#define USAGE_COMMON_SHORT_OPTS "hV"
896
897/* Helper for aligning long_opts array */
898#define a_argument required_argument
899
900/* Helper for usage_long_opts option array */
901#define USAGE_COMMON_LONG_OPTS \
902 {"help", no_argument, NULL, 'h'}, \
903 {"version", no_argument, NULL, 'V'}, \
904 {NULL, no_argument, NULL, 0x0}
905
906/* Helper for usage_opts_help array */
907#define USAGE_COMMON_OPTS_HELP \
908 "Print this help and exit", \
909 "Print version and exit", \
910 NULL
911
912/* Helper for getopt case statements */
913#define case_USAGE_COMMON_FLAGS \
914 case 'h': usage(NULL); \
915 case 'V': util_version(); \
916 case '?': usage("unknown option");
917
918static const char usage_short_opts[] =
919 "haAc:b:C:defg:G:HIlLmn:N:o:O:p:P:rRsStTv"
920 USAGE_COMMON_SHORT_OPTS;
921static struct option const usage_long_opts[] = {
922 {"show-address", no_argument, NULL, 'a'},
923 {"colour", no_argument, NULL, 'A'},
924 {"include-node-with-prop", a_argument, NULL, 'b'},
925 {"include-compat", a_argument, NULL, 'c'},
926 {"exclude-compat", a_argument, NULL, 'C'},
927 {"diff", no_argument, NULL, 'd'},
928 {"enter-node", no_argument, NULL, 'e'},
929 {"show-offset", no_argument, NULL, 'f'},
930 {"include-match", a_argument, NULL, 'g'},
931 {"exclude-match", a_argument, NULL, 'G'},
932 {"show-header", no_argument, NULL, 'H'},
933 {"show-version", no_argument, NULL, 'I'},
934 {"list-regions", no_argument, NULL, 'l'},
935 {"list-strings", no_argument, NULL, 'L'},
936 {"include-mem", no_argument, NULL, 'm'},
937 {"include-node", a_argument, NULL, 'n'},
938 {"exclude-node", a_argument, NULL, 'N'},
939 {"include-prop", a_argument, NULL, 'p'},
940 {"exclude-prop", a_argument, NULL, 'P'},
941 {"remove-strings", no_argument, NULL, 'r'},
942 {"include-root", no_argument, NULL, 'R'},
943 {"show-subnodes", no_argument, NULL, 's'},
944 {"skip-supernodes", no_argument, NULL, 'S'},
945 {"show-stringtab", no_argument, NULL, 't'},
946 {"show-aliases", no_argument, NULL, 'T'},
947 {"out", a_argument, NULL, 'o'},
948 {"out-format", a_argument, NULL, 'O'},
949 {"invert-match", no_argument, NULL, 'v'},
950 USAGE_COMMON_LONG_OPTS,
951};
952static const char * const usage_opts_help[] = {
953 "Display address",
954 "Show all nodes/tags, colour those that match",
955 "Include contains containing property",
956 "Compatible nodes to include in grep",
957 "Compatible nodes to exclude in grep",
958 "Diff: Mark matching nodes with +, others with -",
959 "Enter direct subnode names of matching nodes",
960 "Display offset",
961 "Node/property/compatible string to include in grep",
962 "Node/property/compatible string to exclude in grep",
963 "Output a header",
964 "Put \"/dts-v1/;\" on first line of dts output",
965 "Output a region list",
966 "List strings in string table",
967 "Include mem_rsvmap section in binary output",
968 "Node to include in grep",
969 "Node to exclude in grep",
970 "Property to include in grep",
971 "Property to exclude in grep",
972 "Remove unused strings from string table",
973 "Include root node and all properties",
974 "Show all subnodes matching nodes",
975 "Don't include supernodes of matching nodes",
976 "Include string table in binary output",
977 "Include matching aliases in output",
978 "-o <output file>",
979 "-O <output format>",
980 "Invert the sense of matching (select non-matching lines)",
981 USAGE_COMMON_OPTS_HELP
982};
983
984/**
985 * Call getopt_long() with standard options
986 *
987 * Since all util code runs getopt in the same way, provide a helper.
988 */
989#define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \
990 usage_long_opts, NULL)
991
992void util_usage(const char *errmsg, const char *synopsis,
993 const char *short_opts, struct option const long_opts[],
994 const char * const opts_help[])
995{
996 FILE *fp = errmsg ? stderr : stdout;
997 const char a_arg[] = "<arg>";
998 size_t a_arg_len = strlen(a_arg) + 1;
999 size_t i;
1000 int optlen;
1001
1002 fprintf(fp,
1003 "Usage: %s\n"
1004 "\n"
1005 "Options: -[%s]\n", synopsis, short_opts);
1006
1007 /* prescan the --long opt length to auto-align */
1008 optlen = 0;
1009 for (i = 0; long_opts[i].name; ++i) {
1010 /* +1 is for space between --opt and help text */
1011 int l = strlen(long_opts[i].name) + 1;
1012 if (long_opts[i].has_arg == a_argument)
1013 l += a_arg_len;
1014 if (optlen < l)
1015 optlen = l;
1016 }
1017
1018 for (i = 0; long_opts[i].name; ++i) {
1019 /* helps when adding new applets or options */
1020 assert(opts_help[i] != NULL);
1021
1022 /* first output the short flag if it has one */
1023 if (long_opts[i].val > '~')
1024 fprintf(fp, " ");
1025 else
1026 fprintf(fp, " -%c, ", long_opts[i].val);
1027
1028 /* then the long flag */
1029 if (long_opts[i].has_arg == no_argument) {
1030 fprintf(fp, "--%-*s", optlen, long_opts[i].name);
1031 } else {
1032 fprintf(fp, "--%s %s%*s", long_opts[i].name, a_arg,
1033 (int)(optlen - strlen(long_opts[i].name) -
1034 a_arg_len), "");
1035 }
1036
1037 /* finally the help text */
1038 fprintf(fp, "%s\n", opts_help[i]);
1039 }
1040
1041 if (errmsg) {
1042 fprintf(fp, "\nError: %s\n", errmsg);
1043 exit(EXIT_FAILURE);
1044 } else {
1045 exit(EXIT_SUCCESS);
1046 }
1047}
1048
1049/**
1050 * Show usage and exit
1051 *
1052 * If you name all your usage variables with usage_xxx, then you can call this
1053 * help macro rather than expanding all arguments yourself.
1054 *
1055 * @param errmsg If non-NULL, an error message to display
1056 */
1057#define usage(errmsg) \
1058 util_usage(errmsg, usage_synopsis, usage_short_opts, \
1059 usage_long_opts, usage_opts_help)
1060
1061void util_version(void)
1062{
1063 printf("Version: %s\n", "(U-Boot)");
1064 exit(0);
1065}
1066
1067static void scan_args(struct display_info *disp, int argc, char *argv[])
1068{
1069 int opt;
1070
1071 while ((opt = util_getopt_long()) != EOF) {
1072 int type = 0;
1073 int inc = 1;
1074
1075 switch (opt) {
1076 case_USAGE_COMMON_FLAGS
1077 case 'a':
1078 disp->show_addr = 1;
1079 break;
1080 case 'A':
1081 disp->all = 1;
1082 break;
1083 case 'b':
1084 type = FDT_NODE_HAS_PROP;
1085 break;
1086 case 'C':
1087 inc = 0;
1088 /* no break */
1089 case 'c':
1090 type = FDT_IS_COMPAT;
1091 break;
1092 case 'd':
1093 disp->diff = 1;
1094 break;
1095 case 'e':
1096 disp->flags |= FDT_REG_DIRECT_SUBNODES;
1097 break;
1098 case 'f':
1099 disp->show_offset = 1;
1100 break;
1101 case 'G':
1102 inc = 0;
1103 /* no break */
1104 case 'g':
1105 type = FDT_ANY_GLOBAL;
1106 break;
1107 case 'H':
1108 disp->header = 1;
1109 break;
1110 case 'l':
1111 disp->region_list = 1;
1112 break;
1113 case 'L':
1114 disp->list_strings = 1;
1115 break;
1116 case 'm':
1117 disp->flags |= FDT_REG_ADD_MEM_RSVMAP;
1118 break;
1119 case 'N':
1120 inc = 0;
1121 /* no break */
1122 case 'n':
1123 type = FDT_IS_NODE;
1124 break;
1125 case 'o':
1126 disp->output_fname = optarg;
1127 break;
1128 case 'O':
1129 if (!strcmp(optarg, "dtb"))
1130 disp->output = OUT_DTB;
1131 else if (!strcmp(optarg, "dts"))
1132 disp->output = OUT_DTS;
1133 else if (!strcmp(optarg, "bin"))
1134 disp->output = OUT_BIN;
1135 else
1136 usage("Unknown output format");
1137 break;
1138 case 'P':
1139 inc = 0;
1140 /* no break */
1141 case 'p':
1142 type = FDT_IS_PROP;
1143 break;
1144 case 'r':
1145 disp->remove_strings = 1;
1146 break;
1147 case 'R':
1148 disp->include_root = 1;
1149 break;
1150 case 's':
1151 disp->flags |= FDT_REG_ALL_SUBNODES;
1152 break;
1153 case 'S':
1154 disp->flags &= ~FDT_REG_SUPERNODES;
1155 break;
1156 case 't':
1157 disp->flags |= FDT_REG_ADD_STRING_TAB;
1158 break;
1159 case 'T':
1160 disp->add_aliases = 1;
1161 break;
1162 case 'v':
1163 disp->invert = 1;
1164 break;
1165 case 'I':
1166 disp->show_dts_version = 1;
1167 break;
1168 }
1169
1170 if (type && value_add(disp, &disp->value_head, type, inc,
1171 optarg))
1172 usage("Cannot add value");
1173 }
1174
1175 if (disp->invert && disp->types_exc)
1176 usage("-v has no meaning when used with 'exclude' conditions");
1177}
1178
1179int main(int argc, char *argv[])
1180{
1181 char *filename = NULL;
1182 struct display_info disp;
1183 int ret;
1184
1185 /* set defaults */
1186 memset(&disp, '\0', sizeof(disp));
1187 disp.flags = FDT_REG_SUPERNODES; /* Default flags */
1188
1189 scan_args(&disp, argc, argv);
1190
1191 /* Show matched lines in colour if we can */
1192 disp.colour = disp.all && isatty(0);
1193
1194 /* Any additional arguments can match anything, just like -g */
1195 while (optind < argc - 1) {
1196 if (value_add(&disp, &disp.value_head, FDT_IS_ANY, 1,
1197 argv[optind++]))
1198 usage("Cannot add value");
1199 }
1200
1201 if (optind < argc)
1202 filename = argv[optind++];
1203 if (!filename)
1204 usage("Missing filename");
1205
1206 /* If a valid .dtb is required, set flags to ensure we get one */
1207 if (disp.output == OUT_DTB) {
1208 disp.header = 1;
1209 disp.flags |= FDT_REG_ADD_MEM_RSVMAP | FDT_REG_ADD_STRING_TAB;
1210 }
1211
1212 if (disp.output_fname) {
1213 disp.fout = fopen(disp.output_fname, "w");
1214 if (!disp.fout)
1215 usage("Cannot open output file");
1216 } else {
1217 disp.fout = stdout;
1218 }
1219
1220 /* Run the grep and output the results */
1221 ret = do_fdtgrep(&disp, filename);
1222 if (disp.output_fname)
1223 fclose(disp.fout);
1224 if (ret)
1225 return 1;
1226
1227 return 0;
1228}