arch/mips/boot/compressed/calc_vmlinuz_load_addr.c

   1 /*
   2  * Copyright (C) 2010 "Wu Zhangjin" <wuzhangjin@gmail.com>
   3  *
   4  * This program is free software; you can redistribute  it and/or modify it
   5  * under  the terms of  the GNU General  Public License as published by the
   6  * Free Software Foundation;  either version 2 of the  License, or (at your
   7  * option) any later version.
   8  */
   9
  10 #include <sys/types.h>
  11 #include <sys/stat.h>
  12 #include <errno.h>
  13 #include <stdint.h>
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16
  17 int main(int argc, char *argv[])
  18 {
  19         unsigned long long vmlinux_size, vmlinux_load_addr, vmlinuz_load_addr;
  20         struct stat sb;
  21
  22         if (argc != 3) {
  23                 fprintf(stderr, "Usage: %s <pathname> <vmlinux_load_addr>\n",
  24                                 argv[0]);
  25                 return EXIT_FAILURE;
  26         }
  27
  28         if (stat(argv[1], &sb) == -1) {
  29                 perror("stat");
  30                 return EXIT_FAILURE;
  31         }
  32
  33         /* Convert hex characters to dec number */
  34         errno = 0;
  35         if (sscanf(argv[2], "%llx", &vmlinux_load_addr) != 1) {
  36                 if (errno != 0)
  37                         perror("sscanf");
  38                 else
  39                         fprintf(stderr, "No matching characters\n");
  40
  41                 return EXIT_FAILURE;
  42         }
  43
  44         vmlinux_size = (uint64_t)sb.st_size;
  45         vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;
  46
  47         /*
  48          * Align with 16 bytes: "greater than that used for any standard data
  49          * types by a MIPS compiler." -- See MIPS Run Linux (Second Edition).
  50          */
  51
  52         vmlinuz_load_addr += (16 - vmlinux_size % 16);
  53
  54         printf("0x%llx\n", vmlinuz_load_addr);
  55
  56         return EXIT_SUCCESS;
  57 }