tools/default_image.c

   1 /*
   2  * (C) Copyright 2008 Semihalf
   3  *
   4  * (C) Copyright 2000-2004
   5  * DENX Software Engineering
   6  * Wolfgang Denk, wd@denx.de
   7  *
   8  * Updated-by: Prafulla Wadaskar <prafulla@marvell.com>
   9  *              default_image specific code abstracted from mkimage.c
  10  *              some functions added to address abstraction
  11  *
  12  * All rights reserved.
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include "imagetool.h"
  18 #include <image.h>
  19 #include <u-boot/crc.h>
  20
  21 static image_header_t header;
  22
  23 static int image_check_image_types(uint8_t type)
  24 {
  25         if (((type > IH_TYPE_INVALID) && (type < IH_TYPE_FLATDT)) ||
  26             (type == IH_TYPE_KERNEL_NOLOAD))
  27                 return EXIT_SUCCESS;
  28         else
  29                 return EXIT_FAILURE;
  30 }
  31
  32 static int image_check_params(struct image_tool_params *params)
  33 {
  34         return  ((params->dflag && (params->fflag || params->lflag)) ||
  35                 (params->fflag && (params->dflag || params->lflag)) ||
  36                 (params->lflag && (params->dflag || params->fflag)));
  37 }
  38
  39 static int image_verify_header(unsigned char *ptr, int image_size,
  40                         struct image_tool_params *params)
  41 {
  42         uint32_t len;
  43         const unsigned char *data;
  44         uint32_t checksum;
  45         image_header_t header;
  46         image_header_t *hdr = &header;
  47
  48         /*
  49          * create copy of header so that we can blank out the
  50          * checksum field for checking - this can't be done
  51          * on the PROT_READ mapped data.
  52          */
  53         memcpy(hdr, ptr, sizeof(image_header_t));
  54
  55         if (be32_to_cpu(hdr->ih_magic) != IH_MAGIC) {
  56                 fprintf(stderr,
  57                         "%s: Bad Magic Number: \"%s\" is no valid image\n",
  58                         params->cmdname, params->imagefile);
  59                 return -FDT_ERR_BADMAGIC;
  60         }
  61
  62         data = (const unsigned char *)hdr;
  63         len  = sizeof(image_header_t);
  64
  65         checksum = be32_to_cpu(hdr->ih_hcrc);
  66         hdr->ih_hcrc = cpu_to_be32(0);  /* clear for re-calculation */
  67
  68         if (crc32(0, data, len) != checksum) {
  69                 fprintf(stderr,
  70                         "%s: ERROR: \"%s\" has bad header checksum!\n",
  71                         params->cmdname, params->imagefile);
  72                 return -FDT_ERR_BADSTATE;
  73         }
  74
  75         data = (const unsigned char *)ptr + sizeof(image_header_t);
  76         len  = image_size - sizeof(image_header_t) ;
  77
  78         checksum = be32_to_cpu(hdr->ih_dcrc);
  79         if (crc32(0, data, len) != checksum) {
  80                 fprintf(stderr,
  81                         "%s: ERROR: \"%s\" has corrupted data!\n",
  82                         params->cmdname, params->imagefile);
  83                 return -FDT_ERR_BADSTRUCTURE;
  84         }
  85         return 0;
  86 }
  87
  88 static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
  89                                 struct image_tool_params *params)
  90 {
  91         uint32_t checksum;
  92
  93         image_header_t * hdr = (image_header_t *)ptr;
  94
  95         checksum = crc32(0,
  96                         (const unsigned char *)(ptr +
  97                                 sizeof(image_header_t)),
  98                         sbuf->st_size - sizeof(image_header_t));
  99
 100         /* Build new header */
 101         image_set_magic(hdr, IH_MAGIC);
 102         image_set_time(hdr, sbuf->st_mtime);
 103         image_set_size(hdr, sbuf->st_size - sizeof(image_header_t));
 104         image_set_load(hdr, params->addr);
 105         image_set_ep(hdr, params->ep);
 106         image_set_dcrc(hdr, checksum);
 107         image_set_os(hdr, params->os);
 108         image_set_arch(hdr, params->arch);
 109         image_set_type(hdr, params->type);
 110         image_set_comp(hdr, params->comp);
 111
 112         image_set_name(hdr, params->imagename);
 113
 114         checksum = crc32(0, (const unsigned char *)hdr,
 115                                 sizeof(image_header_t));
 116
 117         image_set_hcrc(hdr, checksum);
 118 }
 119
 120 static int image_extract_subimage(void *ptr, struct image_tool_params *params)
 121 {
 122         const image_header_t *hdr = (const image_header_t *)ptr;
 123         ulong file_data;
 124         ulong file_len;
 125
 126         if (image_check_type(hdr, IH_TYPE_MULTI)) {
 127                 ulong idx = params->pflag;
 128                 ulong count;
 129
 130                 /* get the number of data files present in the image */
 131                 count = image_multi_count(hdr);
 132
 133                 /* retrieve the "data file" at the idx position */
 134                 image_multi_getimg(hdr, idx, &file_data, &file_len);
 135
 136                 if ((file_len == 0) || (idx >= count)) {
 137                         fprintf(stderr, "%s: No such data file %ld in \"%s\"\n",
 138                                 params->cmdname, idx, params->imagefile);
 139                         return -1;
 140                 }
 141         } else {
 142                 file_data = image_get_data(hdr);
 143                 file_len = image_get_size(hdr);
 144         }
 145
 146         /* save the "data file" into the file system */
 147         return imagetool_save_subimage(params->outfile, file_data, file_len);
 148 }
 149
 150 /*
 151  * Default image type parameters definition
 152  */
 153 U_BOOT_IMAGE_TYPE(
 154         defimage,
 155         "Default Image support",
 156         sizeof(image_header_t),
 157         (void *)&header,
 158         image_check_params,
 159         image_verify_header,
 160         image_print_contents,
 161         image_set_header,
 162         image_extract_subimage,
 163         image_check_image_types,
 164         NULL,
 165         NULL
 166 );