tests/dtbs_equal_ordered.c

// SPDX-License-Identifier: LGPL-2.1-or-later
/*
 * libfdt - Flat Device Tree manipulation
 *	Tests if two given dtbs are structurally equal (including order)
 * Copyright (C) 2007 David Gibson, IBM Corporation.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>

#include <libfdt.h>

#include "tests.h"
#include "testdata.h"

static int notequal; /* = 0 */

#define MISMATCH(fmt, ...)			\
	do { \
		if (notequal) \
			PASS(); \
		else \
			FAIL(fmt, ##__VA_ARGS__);	\
	} while (0)

#define MATCH()			\
	do { \
		if (!notequal) \
			PASS(); \
		else \
			FAIL("Trees match which shouldn't");	\
	} while (0)

#define CHECK(code) \
	{ \
		err = (code); \
		if (err) \
			FAIL(#code ": %s", fdt_strerror(err)); \
	}

static void compare_mem_rsv(const void *fdt1, const void *fdt2)
{
	int i;
	uint64_t addr1, size1, addr2, size2;
	int err;

	if (fdt_num_mem_rsv(fdt1) != fdt_num_mem_rsv(fdt2))
		MISMATCH("Trees have different number of reserve entries");
	for (i = 0; i < fdt_num_mem_rsv(fdt1); i++) {
		CHECK(fdt_get_mem_rsv(fdt1, i, &addr1, &size1));
		CHECK(fdt_get_mem_rsv(fdt2, i, &addr2, &size2));

		if ((addr1 != addr2) || (size1 != size2))
			MISMATCH("Mismatch in reserve entry %d: "
				 "(0x%llx, 0x%llx) != (0x%llx, 0x%llx)", i,
				 (unsigned long long)addr1,
				 (unsigned long long)size1,
				 (unsigned long long)addr2,
				 (unsigned long long)size2);
	}
}

static void compare_structure(const void *fdt1, const void *fdt2)
{
	int nextoffset1 = 0, nextoffset2 = 0;
	int offset1, offset2;
	uint32_t tag1, tag2;
	const char *name1, *name2;
	int err;
	const struct fdt_property *prop1, *prop2;
	int len1, len2;

	while (1) {
		do {
			offset1 = nextoffset1;
			tag1 = fdt_next_tag(fdt1, offset1, &nextoffset1);
		} while (tag1 == FDT_NOP);
		do {
			offset2 = nextoffset2;
			tag2 = fdt_next_tag(fdt2, offset2, &nextoffset2);
		} while (tag2 == FDT_NOP);

		if (tag1 != tag2)
			MISMATCH("Tag mismatch (%d != %d) at (%d, %d)",
			     tag1, tag2, offset1, offset2);

		switch (tag1) {
		case FDT_BEGIN_NODE:
			name1 = fdt_get_name(fdt1, offset1, &err);
			if (!name1)
				FAIL("fdt_get_name(fdt1, %d, ..): %s",
				     offset1, fdt_strerror(err));
			name2 = fdt_get_name(fdt2, offset2, NULL);
			if (!name2)
				FAIL("fdt_get_name(fdt2, %d, ..): %s",
				     offset2, fdt_strerror(err));

			if (!streq(name1, name2))
			    MISMATCH("Name mismatch (\"%s\" != \"%s\") at (%d, %d)",
				     name1, name2, offset1, offset2);
			break;

		case FDT_PROP:
			prop1 = fdt_offset_ptr(fdt1, offset1, sizeof(*prop1));
			if (!prop1)
				FAIL("Could get fdt1 property at %d", offset1);
			prop2 = fdt_offset_ptr(fdt2, offset2, sizeof(*prop2));
			if (!prop2)
				FAIL("Could get fdt2 property at %d", offset2);

			name1 = fdt_string(fdt1, fdt32_to_cpu(prop1->nameoff));
			name2 = fdt_string(fdt2, fdt32_to_cpu(prop2->nameoff));
			if (!streq(name1, name2))
				MISMATCH("Property name mismatch \"%s\" != \"%s\" "
					 "at (%d, %d)", name1, name2, offset1, offset2);
			len1 = fdt32_to_cpu(prop1->len);
			len2 = fdt32_to_cpu(prop2->len);
			if (len1 != len2)
				MISMATCH("Property length mismatch %u != %u "
					 "at (%d, %d)", len1, len2, offset1, offset2);

			if (memcmp(prop1->data, prop2->data, len1) != 0)
				MISMATCH("Property value mismatch at (%d, %d)",
					 offset1, offset2);
			break;

		case FDT_END:
			return;
		}
	}
}

int main(int argc, char *argv[])
{
	void *fdt1, *fdt2;
	uint32_t cpuid1, cpuid2;

	test_init(argc, argv);
	if ((argc != 3)
	    && ((argc != 4) || !streq(argv[1], "-n")))
		CONFIG("Usage: %s [-n] <dtb file> <dtb file>", argv[0]);
	if (argc == 4)
		notequal = 1;

	fdt1 = load_blob(argv[argc-2]);
	fdt2 = load_blob(argv[argc-1]);

	compare_mem_rsv(fdt1, fdt2);
	compare_structure(fdt1, fdt2);

	cpuid1 = fdt_boot_cpuid_phys(fdt1);
	cpuid2 = fdt_boot_cpuid_phys(fdt2);
	if (cpuid1 != cpuid2)
		MISMATCH("boot_cpuid_phys mismatch 0x%x != 0x%x",
			 cpuid1, cpuid2);

	MATCH();
}