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