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249 lines
6.1 KiB
249 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* fdtdump.c - Contributed by Pantelis Antoniou <pantelis.antoniou AT gmail.com>
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include <libfdt.h>
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#include <libfdt_env.h>
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#include <fdt.h>
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#include "util.h"
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#define FDT_MAGIC_SIZE 4
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#define MAX_VERSION 17
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#define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1))
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#define PALIGN(p, a) ((void *)(ALIGN((unsigned long)(p), (a))))
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#define GET_CELL(p) (p += 4, *((const fdt32_t *)(p-4)))
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static const char *tagname(uint32_t tag)
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{
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static const char * const names[] = {
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#define TN(t) [t] = #t
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TN(FDT_BEGIN_NODE),
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TN(FDT_END_NODE),
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TN(FDT_PROP),
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TN(FDT_NOP),
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TN(FDT_END),
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#undef TN
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};
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if (tag < ARRAY_SIZE(names))
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if (names[tag])
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return names[tag];
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return "FDT_???";
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}
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#define dumpf(fmt, args...) \
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do { if (debug) printf("// " fmt, ## args); } while (0)
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static void dump_blob(void *blob, bool debug)
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{
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uintptr_t blob_off = (uintptr_t)blob;
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struct fdt_header *bph = blob;
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uint32_t off_mem_rsvmap = fdt32_to_cpu(bph->off_mem_rsvmap);
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uint32_t off_dt = fdt32_to_cpu(bph->off_dt_struct);
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uint32_t off_str = fdt32_to_cpu(bph->off_dt_strings);
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struct fdt_reserve_entry *p_rsvmap =
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(struct fdt_reserve_entry *)((char *)blob + off_mem_rsvmap);
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const char *p_struct = (const char *)blob + off_dt;
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const char *p_strings = (const char *)blob + off_str;
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uint32_t version = fdt32_to_cpu(bph->version);
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uint32_t totalsize = fdt32_to_cpu(bph->totalsize);
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uint32_t tag;
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const char *p, *s, *t;
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int depth, sz, shift;
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int i;
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uint64_t addr, size;
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depth = 0;
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shift = 4;
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printf("/dts-v1/;\n");
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printf("// magic:\t\t0x%"PRIx32"\n", fdt32_to_cpu(bph->magic));
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printf("// totalsize:\t\t0x%"PRIx32" (%"PRIu32")\n",
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totalsize, totalsize);
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printf("// off_dt_struct:\t0x%"PRIx32"\n", off_dt);
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printf("// off_dt_strings:\t0x%"PRIx32"\n", off_str);
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printf("// off_mem_rsvmap:\t0x%"PRIx32"\n", off_mem_rsvmap);
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printf("// version:\t\t%"PRIu32"\n", version);
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printf("// last_comp_version:\t%"PRIu32"\n",
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fdt32_to_cpu(bph->last_comp_version));
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if (version >= 2)
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printf("// boot_cpuid_phys:\t0x%"PRIx32"\n",
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fdt32_to_cpu(bph->boot_cpuid_phys));
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if (version >= 3)
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printf("// size_dt_strings:\t0x%"PRIx32"\n",
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fdt32_to_cpu(bph->size_dt_strings));
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if (version >= 17)
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printf("// size_dt_struct:\t0x%"PRIx32"\n",
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fdt32_to_cpu(bph->size_dt_struct));
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printf("\n");
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for (i = 0; ; i++) {
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addr = fdt64_to_cpu(p_rsvmap[i].address);
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size = fdt64_to_cpu(p_rsvmap[i].size);
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if (addr == 0 && size == 0)
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break;
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printf("/memreserve/ %#"PRIx64" %#"PRIx64";\n",
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addr, size);
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}
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p = p_struct;
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while ((tag = fdt32_to_cpu(GET_CELL(p))) != FDT_END) {
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dumpf("%04"PRIxPTR": tag: 0x%08"PRIx32" (%s)\n",
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(uintptr_t)p - blob_off - 4, tag, tagname(tag));
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if (tag == FDT_BEGIN_NODE) {
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s = p;
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p = PALIGN(p + strlen(s) + 1, 4);
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if (*s == '\0')
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s = "/";
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printf("%*s%s {\n", depth * shift, "", s);
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depth++;
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continue;
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}
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if (tag == FDT_END_NODE) {
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depth--;
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printf("%*s};\n", depth * shift, "");
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continue;
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}
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if (tag == FDT_NOP) {
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printf("%*s// [NOP]\n", depth * shift, "");
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continue;
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}
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if (tag != FDT_PROP) {
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fprintf(stderr, "%*s ** Unknown tag 0x%08"PRIx32"\n", depth * shift, "", tag);
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break;
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}
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sz = fdt32_to_cpu(GET_CELL(p));
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s = p_strings + fdt32_to_cpu(GET_CELL(p));
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if (version < 16 && sz >= 8)
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p = PALIGN(p, 8);
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t = p;
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p = PALIGN(p + sz, 4);
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dumpf("%04"PRIxPTR": string: %s\n", (uintptr_t)s - blob_off, s);
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dumpf("%04"PRIxPTR": value\n", (uintptr_t)t - blob_off);
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printf("%*s%s", depth * shift, "", s);
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utilfdt_print_data(t, sz);
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printf(";\n");
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}
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}
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/* Usage related data. */
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static const char usage_synopsis[] = "fdtdump [options] <file>";
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static const char usage_short_opts[] = "ds" USAGE_COMMON_SHORT_OPTS;
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static struct option const usage_long_opts[] = {
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{"debug", no_argument, NULL, 'd'},
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{"scan", no_argument, NULL, 's'},
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USAGE_COMMON_LONG_OPTS
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};
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static const char * const usage_opts_help[] = {
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"Dump debug information while decoding the file",
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"Scan for an embedded fdt in file",
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USAGE_COMMON_OPTS_HELP
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};
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static bool valid_header(char *p, off_t len)
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{
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if (len < sizeof(struct fdt_header) ||
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fdt_magic(p) != FDT_MAGIC ||
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fdt_version(p) > MAX_VERSION ||
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fdt_last_comp_version(p) > MAX_VERSION ||
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fdt_totalsize(p) >= len ||
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fdt_off_dt_struct(p) >= len ||
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fdt_off_dt_strings(p) >= len)
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return 0;
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else
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return 1;
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}
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int main(int argc, char *argv[])
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{
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int opt;
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const char *file;
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char *buf;
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bool debug = false;
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bool scan = false;
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size_t len;
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fprintf(stderr, "\n"
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"**** fdtdump is a low-level debugging tool, not meant for general use.\n"
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"**** If you want to decompile a dtb, you probably want\n"
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"**** dtc -I dtb -O dts <filename>\n\n"
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);
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while ((opt = util_getopt_long()) != EOF) {
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switch (opt) {
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case_USAGE_COMMON_FLAGS
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case 'd':
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debug = true;
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break;
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case 's':
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scan = true;
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break;
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}
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}
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if (optind != argc - 1)
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usage("missing input filename");
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file = argv[optind];
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buf = utilfdt_read(file, &len);
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if (!buf)
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die("could not read: %s\n", file);
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/* try and locate an embedded fdt in a bigger blob */
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if (scan) {
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unsigned char smagic[FDT_MAGIC_SIZE];
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char *p = buf;
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char *endp = buf + len;
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fdt_set_magic(smagic, FDT_MAGIC);
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/* poor man's memmem */
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while ((endp - p) >= FDT_MAGIC_SIZE) {
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p = memchr(p, smagic[0], endp - p - FDT_MAGIC_SIZE);
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if (!p)
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break;
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if (fdt_magic(p) == FDT_MAGIC) {
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/* try and validate the main struct */
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off_t this_len = endp - p;
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if (valid_header(p, this_len))
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break;
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if (debug)
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printf("%s: skipping fdt magic at offset %#tx\n",
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file, p - buf);
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}
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++p;
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}
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if (!p || endp - p < sizeof(struct fdt_header))
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die("%s: could not locate fdt magic\n", file);
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printf("%s: found fdt at offset %#tx\n", file, p - buf);
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buf = p;
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} else if (!valid_header(buf, len))
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die("%s: header is not valid\n", file);
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dump_blob(buf, debug);
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return 0;
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}
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