tools/imagetool.h

   1 /*
   2  * (C) Copyright 2013
   3  *
   4  * Written by Guilherme Maciel Ferreira <guilherme.maciel.ferreira@gmail.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #ifndef _IMAGETOOL_H_
  10 #define _IMAGETOOL_H_
  11
  12 #include "os_support.h"
  13 #include <errno.h>
  14 #include <fcntl.h>
  15 #include <stdio.h>
  16 #include <stdlib.h>
  17 #include <string.h>
  18 #include <sys/stat.h>
  19 #include <sys/types.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <u-boot/sha1.h>
  23
  24 #include "fdt_host.h"
  25
  26 #define ARRAY_SIZE(x)           (sizeof(x) / sizeof((x)[0]))
  27
  28 #define IH_ARCH_DEFAULT         IH_ARCH_INVALID
  29
  30 /* Information about a file that needs to be placed into the FIT */
  31 struct content_info {
  32         struct content_info *next;
  33         int type;               /* File type (IH_TYPE_...) */
  34         const char *fname;
  35 };
  36
  37 /*
  38  * This structure defines all such variables those are initialized by
  39  * mkimage and dumpimage main core and need to be referred by image
  40  * type specific functions
  41  */
  42 struct image_tool_params {
  43         int dflag;
  44         int eflag;
  45         int fflag;
  46         int iflag;
  47         int lflag;
  48         int pflag;
  49         int vflag;
  50         int xflag;
  51         int skipcpy;
  52         int os;
  53         int arch;
  54         int type;
  55         int comp;
  56         char *dtc;
  57         unsigned int addr;
  58         unsigned int ep;
  59         char *imagename;
  60         char *imagename2;
  61         char *datafile;
  62         char *imagefile;
  63         char *cmdname;
  64         const char *outfile;    /* Output filename */
  65         const char *keydir;     /* Directory holding private keys */
  66         const char *keydest;    /* Destination .dtb for public key */
  67         const char *comment;    /* Comment to add to signature node */
  68         int require_keys;       /* 1 to mark signing keys as 'required' */
  69         int file_size;          /* Total size of output file */
  70         int orig_file_size;     /* Original size for file before padding */
  71         bool auto_its;          /* Automatically create the .its file */
  72         int fit_image_type;     /* Image type to put into the FIT */
  73         char *fit_ramdisk;      /* Ramdisk file to include */
  74         struct content_info *content_head;      /* List of files to include */
  75         struct content_info *content_tail;
  76         bool external_data;     /* Store data outside the FIT */
  77         bool quiet;             /* Don't output text in normal operation */
  78         unsigned int external_offset;   /* Add padding to external data */
  79         const char *engine_id;  /* Engine to use for signing */
  80 };
  81
  82 /*
  83  * image type specific variables and callback functions
  84  */
  85 struct image_type_params {
  86         /* name is an identification tag string for added support */
  87         char *name;
  88         /*
  89          * header size is local to the specific image type to be supported,
  90          * mkimage core treats this as number of bytes
  91          */
  92         uint32_t header_size;
  93         /* Image type header pointer */
  94         void *hdr;
  95         /*
  96          * There are several arguments that are passed on the command line
  97          * and are registered as flags in image_tool_params structure.
  98          * This callback function can be used to check the passed arguments
  99          * are in-lined with the image type to be supported
 100          *
 101          * Returns 1 if parameter check is successful
 102          */
 103         int (*check_params) (struct image_tool_params *);
 104         /*
 105          * This function is used by list command (i.e. mkimage -l <filename>)
 106          * image type verification code must be put here
 107          *
 108          * Returns 0 if image header verification is successful
 109          * otherwise, returns respective negative error codes
 110          */
 111         int (*verify_header) (unsigned char *, int, struct image_tool_params *);
 112         /* Prints image information abstracting from image header */
 113         void (*print_header) (const void *);
 114         /*
 115          * The header or image contents need to be set as per image type to
 116          * be generated using this callback function.
 117          * further output file post processing (for ex. checksum calculation,
 118          * padding bytes etc..) can also be done in this callback function.
 119          */
 120         void (*set_header) (void *, struct stat *, int,
 121                                         struct image_tool_params *);
 122         /*
 123          * This function is used by the command to retrieve a component
 124          * (sub-image) from the image (i.e. dumpimage -i <image> -p <position>
 125          * <sub-image-name>).
 126          * Thus the code to extract a file from an image must be put here.
 127          *
 128          * Returns 0 if the file was successfully retrieved from the image,
 129          * or a negative value on error.
 130          */
 131         int (*extract_subimage)(void *, struct image_tool_params *);
 132         /*
 133          * Some image generation support for ex (default image type) supports
 134          * more than one type_ids, this callback function is used to check
 135          * whether input (-T <image_type>) is supported by registered image
 136          * generation/list low level code
 137          */
 138         int (*check_image_type) (uint8_t);
 139         /* This callback function will be executed if fflag is defined */
 140         int (*fflag_handle) (struct image_tool_params *);
 141         /*
 142          * This callback function will be executed for variable size record
 143          * It is expected to build this header in memory and return its length
 144          * and a pointer to it by using image_type_params.header_size and
 145          * image_type_params.hdr. The return value shall indicate if an
 146          * additional padding should be used when copying the data image
 147          * by returning the padding length.
 148          */
 149         int (*vrec_header) (struct image_tool_params *,
 150                 struct image_type_params *);
 151 };
 152
 153 /**
 154  * imagetool_get_type() - find the image type params for a given image type
 155  *
 156  * It scans all registers image type supports
 157  * checks the input type for each supported image type
 158  *
 159  * if successful,
 160  *     returns respective image_type_params pointer if success
 161  * if input type_id is not supported by any of image_type_support
 162  *     returns NULL
 163  */
 164 struct image_type_params *imagetool_get_type(int type);
 165
 166 /*
 167  * imagetool_verify_print_header() - verifies the image header
 168  *
 169  * Scan registered image types and verify the image_header for each
 170  * supported image type. If verification is successful, this prints
 171  * the respective header.
 172  *
 173  * @return 0 on success, negative if input image format does not match with
 174  * any of supported image types
 175  */
 176 int imagetool_verify_print_header(
 177         void *ptr,
 178         struct stat *sbuf,
 179         struct image_type_params *tparams,
 180         struct image_tool_params *params);
 181
 182 /**
 183  * imagetool_save_subimage - store data into a file
 184  * @file_name: name of the destination file
 185  * @file_data: data to be written
 186  * @file_len: the amount of data to store
 187  *
 188  * imagetool_save_subimage() store file_len bytes of data pointed by file_data
 189  * into the file name by file_name.
 190  *
 191  * returns:
 192  *     zero in case of success or a negative value if fail.
 193  */
 194 int imagetool_save_subimage(
 195         const char *file_name,
 196         ulong file_data,
 197         ulong file_len);
 198
 199 /**
 200  * imagetool_get_filesize() - Utility function to obtain the size of a file
 201  *
 202  * This function prints a message if an error occurs, showing the error that
 203  * was obtained.
 204  *
 205  * @params:     mkimage parameters
 206  * @fname:      filename to check
 207  * @return size of file, or -ve value on error
 208  */
 209 int imagetool_get_filesize(struct image_tool_params *params, const char *fname);
 210
 211 /**
 212  * imagetool_get_source_date() - Get timestamp for build output.
 213  *
 214  * Gets a timestamp for embedding it in a build output. If set
 215  * SOURCE_DATE_EPOCH is used. Else the given fallback value is returned. Prints
 216  * an error message if SOURCE_DATE_EPOCH contains an invalid value and returns
 217  * 0.
 218  *
 219  * @params:     mkimage parameters
 220  * @fallback:   timestamp to use if SOURCE_DATE_EPOCH isn't set
 221  * @return timestamp based on SOURCE_DATE_EPOCH
 222  */
 223 time_t imagetool_get_source_date(
 224         struct image_tool_params *params,
 225         time_t fallback);
 226
 227 /*
 228  * There is a c file associated with supported image type low level code
 229  * for ex. default_image.c, fit_image.c
 230  */
 231
 232
 233 void pbl_load_uboot(int fd, struct image_tool_params *mparams);
 234
 235 #define ___cat(a, b) a ## b
 236 #define __cat(a, b) ___cat(a, b)
 237
 238 /* we need some special handling for this host tool running eventually on
 239  * Darwin. The Mach-O section handling is a bit different than ELF section
 240  * handling. The differnces in detail are:
 241  *  a) we have segments which have sections
 242  *  b) we need a API call to get the respective section symbols */
 243 #if defined(__MACH__)
 244 #include <mach-o/getsect.h>
 245
 246 #define INIT_SECTION(name)  do {                                        \
 247                 unsigned long name ## _len;                             \
 248                 char *__cat(pstart_, name) = getsectdata("__TEXT",      \
 249                         #name, &__cat(name, _len));                     \
 250                 char *__cat(pstop_, name) = __cat(pstart_, name) +      \
 251                         __cat(name, _len);                              \
 252                 __cat(__start_, name) = (void *)__cat(pstart_, name);   \
 253                 __cat(__stop_, name) = (void *)__cat(pstop_, name);     \
 254         } while (0)
 255 #define SECTION(name)   __attribute__((section("__TEXT, " #name)))
 256
 257 struct image_type_params **__start_image_type, **__stop_image_type;
 258 #else
 259 #define INIT_SECTION(name) /* no-op for ELF */
 260 #define SECTION(name)   __attribute__((section(#name)))
 261
 262 /* We construct a table of pointers in an ELF section (pointers generally
 263  * go unpadded by gcc).  ld creates boundary syms for us. */
 264 extern struct image_type_params *__start_image_type[], *__stop_image_type[];
 265 #endif /* __MACH__ */
 266
 267 #if !defined(__used)
 268 # if __GNUC__ == 3 && __GNUC_MINOR__ < 3
 269 #  define __used                        __attribute__((__unused__))
 270 # else
 271 #  define __used                        __attribute__((__used__))
 272 # endif
 273 #endif
 274
 275 #define U_BOOT_IMAGE_TYPE( \
 276                 _id, \
 277                 _name, \
 278                 _header_size, \
 279                 _header, \
 280                 _check_params, \
 281                 _verify_header, \
 282                 _print_header, \
 283                 _set_header, \
 284                 _extract_subimage, \
 285                 _check_image_type, \
 286                 _fflag_handle, \
 287                 _vrec_header \
 288         ) \
 289         static struct image_type_params __cat(image_type_, _id) = \
 290         { \
 291                 .name = _name, \
 292                 .header_size = _header_size, \
 293                 .hdr = _header, \
 294                 .check_params = _check_params, \
 295                 .verify_header = _verify_header, \
 296                 .print_header = _print_header, \
 297                 .set_header = _set_header, \
 298                 .extract_subimage = _extract_subimage, \
 299                 .check_image_type = _check_image_type, \
 300                 .fflag_handle = _fflag_handle, \
 301                 .vrec_header = _vrec_header \
 302         }; \
 303         static struct image_type_params *SECTION(image_type) __used \
 304                 __cat(image_type_ptr_, _id) = &__cat(image_type_, _id)
 305
 306 #endif /* _IMAGETOOL_H_ */