calc_vmlinuz_load_addr.c

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/*
 * Copyright (C) 2010 "Wu Zhangjin" <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[])
{
    unsigned long long vmlinux_size, vmlinux_load_addr, vmlinuz_load_addr;
    struct stat sb;

    if (argc != 3) {
        fprintf(stderr, "Usage: %s <pathname> <vmlinux_load_addr>\n",
                argv[0]);
        return EXIT_FAILURE;
    }

    if (stat(argv[1], &sb) == -1) {
        perror("stat");
        return EXIT_FAILURE;
    }

    /* Convert hex characters to dec number */
    errno = 0;
    if (sscanf(argv[2], "%llx", &vmlinux_load_addr) != 1) {
        if (errno != 0)
            perror("sscanf");
        else
            fprintf(stderr, "No matching characters\n");

        return EXIT_FAILURE;
    }

    vmlinux_size = (uint64_t)sb.st_size;
    vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;

    /*
     * Align with 16 bytes: "greater than that used for any standard data
     * types by a MIPS compiler." -- See MIPS Run Linux (Second Edition).
     */

    vmlinuz_load_addr += (16 - vmlinux_size % 16);

    printf("0x%llx\n", vmlinuz_load_addr);

    return EXIT_SUCCESS;
}