arch/mips/boot/compressed/calc_vmlinuz_load_addr.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2010 "Wu Zhangjin" <wuzhangjin@gmail.com>
   4  */
   5
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <linux/sizes.h>
  13
  14 int main(int argc, char *argv[])
  15 {
  16         unsigned long long vmlinux_size, vmlinux_load_addr, vmlinuz_load_addr;
  17         struct stat sb;
  18
  19         if (argc != 3) {
  20                 fprintf(stderr, "Usage: %s <pathname> <vmlinux_load_addr>\n",
  21                                 argv[0]);
  22                 return EXIT_FAILURE;
  23         }
  24
  25         if (stat(argv[1], &sb) == -1) {
  26                 perror("stat");
  27                 return EXIT_FAILURE;
  28         }
  29
  30         /* Convert hex characters to dec number */
  31         errno = 0;
  32         if (sscanf(argv[2], "%llx", &vmlinux_load_addr) != 1) {
  33                 if (errno != 0)
  34                         perror("sscanf");
  35                 else
  36                         fprintf(stderr, "No matching characters\n");
  37
  38                 return EXIT_FAILURE;
  39         }
  40
  41         vmlinux_size = (uint64_t)sb.st_size;
  42         vmlinuz_load_addr = vmlinux_load_addr + vmlinux_size;
  43
  44         /*
  45          * Align with 64KB: KEXEC needs load sections to be aligned to PAGE_SIZE,
  46          * which may be as large as 64KB depending on the kernel configuration.
  47          */
  48
  49         vmlinuz_load_addr += (SZ_64K - vmlinux_size % SZ_64K);
  50
  51         printf("0x%llx\n", vmlinuz_load_addr);
  52
  53         return EXIT_SUCCESS;
  54 }