flthdr.c

   1 /****************************************************************************/
   2 /*
   3  *      A simple program to manipulate flat files
   4  *
   5  *      Copyright (C) 2001-2003 SnapGear Inc, davidm@snapgear.com
   6  *      Copyright (C) 2001 Lineo, davidm@lineo.com
   7  *
   8  * This is Free Software, under the GNU Public Licence v2 or greater.
   9  *
  10  */
  11 /****************************************************************************/
  12
  13 #include <stdio.h>    /* Userland pieces of the ANSI C standard I/O package  */
  14 #include <unistd.h>   /* Userland prototypes of the Unix std system calls    */
  15 #include <time.h>
  16 #include <stdlib.h>   /* exit() */
  17 #include <string.h>   /* strcat(), strcpy() */
  18 #include <inttypes.h>
  19 #include <assert.h>
  20
  21 /* macros for conversion between host and (internet) network byte order */
  22 #ifndef WIN32
  23 #include <netinet/in.h> /* Consts and structs defined by the internet system */
  24 #define BINARY_FILE_OPTS
  25 #else
  26 #include <winsock2.h>
  27 #define BINARY_FILE_OPTS "b"
  28 #endif
  29
  30 #include "compress.h"
  31 #include <libiberty.h>
  32
  33 /* from uClinux-x.x.x/include/linux */
  34 #include "flat.h"     /* Binary flat header description                      */
  35
  36 #if defined(__MINGW32__)
  37 #include <getopt.h>
  38
  39 #define mkstemp(p) mktemp(p)
  40
  41 #endif
  42
  43 #if defined TARGET_bfin
  44 # define flat_get_relocate_addr(addr) (addr & 0x03ffffff)
  45 #else
  46 # define flat_get_relocate_addr(addr) (addr)
  47 #endif
  48
  49 /****************************************************************************/
  50
  51 char *program_name;
  52
  53 static int print = 0, print_relocs = 0, docompress = 0, ramload = 0,
  54            stacksize = 0, ktrace = 0;
  55
  56 /****************************************************************************/
  57
  58 void
  59 process_file(char *ifile, char *ofile)
  60 {
  61         int old_flags, old_stack, new_flags, new_stack;
  62         stream ifp, ofp;
  63         struct flat_hdr old_hdr, new_hdr;
  64         char *tfile, tmpbuf[256];
  65         int input_error, output_error;
  66
  67         *tmpbuf = '\0';
  68
  69         if (fopen_stream_u(&ifp, ifile, "r" BINARY_FILE_OPTS)) {
  70                 fprintf(stderr, "Cannot open %s\n", ifile);
  71                 return;
  72         }
  73
  74         if (fread_stream(&old_hdr, sizeof(old_hdr), 1, &ifp) != 1) {
  75                 fprintf(stderr, "Cannot read header of %s\n", ifile);
  76                 fclose_stream(&ifp);
  77                 return;
  78         }
  79
  80         if (strncmp(old_hdr.magic, "bFLT", 4) != 0) {
  81                 fprintf(stderr, "Cannot read header of %s\n", ifile);
  82                 fclose_stream(&ifp);
  83                 return;
  84         }
  85
  86         new_flags = old_flags = ntohl(old_hdr.flags);
  87         new_stack = old_stack = ntohl(old_hdr.stack_size);
  88         new_hdr = old_hdr;
  89
  90         if (docompress == 1) {
  91                 new_flags |= FLAT_FLAG_GZIP;
  92                 new_flags &= ~FLAT_FLAG_GZDATA;
  93         } else if (docompress == 2) {
  94                 new_flags |= FLAT_FLAG_GZDATA;
  95                 new_flags &= ~FLAT_FLAG_GZIP;
  96         } else if (docompress < 0)
  97                 new_flags &= ~(FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA);
  98
  99         if (ramload > 0)
 100                 new_flags |= FLAT_FLAG_RAM;
 101         else if (ramload < 0)
 102                 new_flags &= ~FLAT_FLAG_RAM;
 103
 104         if (ktrace > 0)
 105                 new_flags |= FLAT_FLAG_KTRACE;
 106         else if (ktrace < 0)
 107                 new_flags &= ~FLAT_FLAG_KTRACE;
 108
 109         if (stacksize)
 110                 new_stack = stacksize;
 111
 112         if (print == 1) {
 113                 time_t t;
 114                 uint32_t reloc_count, reloc_start;
 115
 116                 printf("%s\n", ifile);
 117                 printf("    Magic:        %4.4s\n", old_hdr.magic);
 118                 printf("    Rev:          %d\n",    ntohl(old_hdr.rev));
 119                 t = (time_t) htonl(old_hdr.build_date);
 120                 printf("    Build Date:   %s",      t?ctime(&t):"not specified\n");
 121                 printf("    Entry:        0x%x\n",  ntohl(old_hdr.entry));
 122                 printf("    Data Start:   0x%x\n",  ntohl(old_hdr.data_start));
 123                 printf("    Data End:     0x%x\n",  ntohl(old_hdr.data_end));
 124                 printf("    BSS End:      0x%x\n",  ntohl(old_hdr.bss_end));
 125                 printf("    Stack Size:   0x%x\n",  ntohl(old_hdr.stack_size));
 126                 reloc_start = ntohl(old_hdr.reloc_start);
 127                 printf("    Reloc Start:  0x%x\n",  reloc_start);
 128                 reloc_count = ntohl(old_hdr.reloc_count);
 129                 printf("    Reloc Count:  0x%x\n",  reloc_count);
 130                 printf("    Flags:        0x%x ( ",  ntohl(old_hdr.flags));
 131                 if (old_flags) {
 132                         if (old_flags & FLAT_FLAG_RAM)
 133                                 printf("Load-to-Ram ");
 134                         if (old_flags & FLAT_FLAG_GOTPIC)
 135                                 printf("Has-PIC-GOT ");
 136                         if (old_flags & FLAT_FLAG_GZIP)
 137                                 printf("Gzip-Compressed ");
 138                         if (old_flags & FLAT_FLAG_GZDATA)
 139                                 printf("Gzip-Data-Compressed ");
 140                         if (old_flags & FLAT_FLAG_KTRACE)
 141                                 printf("Kernel-Traced-Load ");
 142                         printf(")\n");
 143                 }
 144
 145                 if (print_relocs) {
 146                         uint32_t *relocs = xcalloc(reloc_count, sizeof(uint32_t));
 147                         uint32_t i;
 148                         unsigned long r;
 149
 150                         printf("    Relocs:\n");
 151                         printf("    #\treloc      (  address )\tdata\n");
 152
 153                         if (old_flags & FLAT_FLAG_GZIP)
 154                                 reopen_stream_compressed(&ifp);
 155                         if (fseek_stream(&ifp, reloc_start, SEEK_SET)) {
 156                                 fprintf(stderr, "Cannot seek to relocs of %s\n", ifile);
 157                                 fclose_stream(&ifp);
 158                                 return;
 159                         }
 160                         if (fread_stream(relocs, sizeof(uint32_t), reloc_count, &ifp) == -1) {
 161                                 fprintf(stderr, "Cannot read relocs of %s\n", ifile);
 162                                 fclose_stream(&ifp);
 163                                 return;
 164                         }
 165
 166                         for (i = 0; i < reloc_count; ++i) {
 167                                 uint32_t raddr, addr;
 168                                 r = ntohl(relocs[i]);
 169                                 raddr = flat_get_relocate_addr(r);
 170                                 printf("    %u\t0x%08lx (0x%08"PRIx32")\t", i, r, raddr);
 171                                 fseek_stream(&ifp, sizeof(old_hdr) + raddr, SEEK_SET);
 172                                 fread_stream(&addr, sizeof(addr), 1, &ifp);
 173                                 printf("%"PRIx32"\n", addr);
 174                         }
 175
 176                         /* reset file position for below */
 177                         fseek_stream(&ifp, sizeof(old_hdr), SEEK_SET);
 178                 }
 179         } else if (print > 1) {
 180                 static int first = 1;
 181                 unsigned int text, data, bss, stk, rel, tot;
 182
 183                 if (first) {
 184                         printf("Flag Rev   Text   Data    BSS  Stack Relocs    RAM Filename\n");
 185                         printf("-----------------------------------------------------------\n");
 186                         first = 0;
 187                 }
 188                 *tmpbuf = '\0';
 189                 strcat(tmpbuf, (old_flags & FLAT_FLAG_KTRACE) ? "k" : "");
 190                 strcat(tmpbuf, (old_flags & FLAT_FLAG_RAM) ? "r" : "");
 191                 strcat(tmpbuf, (old_flags & FLAT_FLAG_GOTPIC) ? "p" : "");
 192                 strcat(tmpbuf, (old_flags & FLAT_FLAG_GZIP) ? "z" :
 193                                         ((old_flags & FLAT_FLAG_GZDATA) ? "d" : ""));
 194                 printf("-%-3.3s ", tmpbuf);
 195                 printf("%3d ", ntohl(old_hdr.rev));
 196                 printf("%6d ", text=ntohl(old_hdr.data_start)-sizeof(struct flat_hdr));
 197                 printf("%6d ", data=ntohl(old_hdr.data_end)-ntohl(old_hdr.data_start));
 198                 printf("%6d ", bss=ntohl(old_hdr.bss_end)-ntohl(old_hdr.data_end));
 199                 printf("%6d ", stk=ntohl(old_hdr.stack_size));
 200                 printf("%6d ", rel=ntohl(old_hdr.reloc_count) * 4);
 201                 /*
 202                  * work out how much RAM is needed per invocation, this
 203                  * calculation is dependent on the binfmt_flat implementation
 204                  */
 205                 tot = data; /* always need data */
 206
 207                 if (old_flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP))
 208                         tot += text + sizeof(struct flat_hdr);
 209
 210                 if (bss + stk > rel) /* which is bigger ? */
 211                         tot += bss + stk;
 212                 else
 213                         tot += rel;
 214
 215                 printf("%6d ", tot);
 216                 /*
 217                  * the total depends on whether the relocs are smaller/bigger than
 218                  * the BSS
 219                  */
 220                 printf("%s\n", ifile);
 221         }
 222
 223         /* if there is nothing else to do, leave */
 224         if (new_flags == old_flags && new_stack == old_stack) {
 225                 fclose_stream(&ifp);
 226                 return;
 227         }
 228
 229         new_hdr.flags = htonl(new_flags);
 230         new_hdr.stack_size = htonl(new_stack);
 231
 232         tfile = make_temp_file("flthdr");
 233
 234         if (fopen_stream_u(&ofp, tfile, "w" BINARY_FILE_OPTS)) {
 235                 fprintf(stderr, "Failed to open %s for writing\n", tfile);
 236                 unlink(tfile);
 237                 exit(1);
 238         }
 239
 240         /* Copy header (always uncompressed).  */
 241         if (fwrite_stream(&new_hdr, sizeof(new_hdr), 1, &ofp) != 1) {
 242                 fprintf(stderr, "Failed to write to  %s\n", tfile);
 243                 unlink(tfile);
 244                 exit(1);
 245         }
 246
 247         /* Whole input file (including text) is compressed: start decompressing
 248            now.  */
 249         if (old_flags & FLAT_FLAG_GZIP)
 250                 reopen_stream_compressed(&ifp);
 251
 252         /* Likewise, output file is compressed. Start compressing now.  */
 253         if (new_flags & FLAT_FLAG_GZIP) {
 254                 printf("zflat %s --> %s\n", ifile, ofile);
 255                 reopen_stream_compressed(&ofp);
 256         }
 257
 258         transfer(&ifp, &ofp,
 259                   ntohl(old_hdr.data_start) - sizeof(struct flat_hdr));
 260
 261         /* Only data and relocs were compressed in input.  Start decompressing
 262            from here.  */
 263         if (old_flags & FLAT_FLAG_GZDATA)
 264                 reopen_stream_compressed(&ifp);
 265
 266         /* Only data/relocs to be compressed in output.  Start compressing
 267            from here.  */
 268         if (new_flags & FLAT_FLAG_GZDATA) {
 269                 printf("zflat-data %s --> %s\n", ifile, ofile);
 270                 reopen_stream_compressed(&ofp);
 271         }
 272
 273         transfer(&ifp, &ofp, -1);
 274
 275         input_error = ferror_stream(&ifp);
 276         output_error = ferror_stream(&ofp);
 277
 278         if (input_error || output_error) {
 279                 fprintf(stderr, "Error on file pointer%s%s\n",
 280                                 input_error ? " input" : "",
 281                                 output_error ? " output" : "");
 282                 unlink(tfile);
 283                 exit(1);
 284         }
 285
 286         fclose_stream(&ifp);
 287         fclose_stream(&ofp);
 288
 289         /* Copy temporary file to output location.  */
 290         fopen_stream_u(&ifp, tfile, "r" BINARY_FILE_OPTS);
 291         fopen_stream_u(&ofp, ofile, "w" BINARY_FILE_OPTS);
 292
 293         transfer(&ifp, &ofp, -1);
 294
 295         fclose_stream(&ifp);
 296         fclose_stream(&ofp);
 297
 298         unlink(tfile);
 299         free(tfile);
 300 }
 301
 302 /****************************************************************************/
 303
 304 void
 305 usage(char *s)
 306 {
 307         if (s)
 308                 fprintf(stderr, "%s\n", s);
 309         fprintf(stderr, "usage: %s [options] flat-file\n", program_name);
 310         fprintf(stderr, "       Allows you to change an existing flat file\n\n");
 311         fprintf(stderr, "       -p      : print current settings\n");
 312         fprintf(stderr, "       -P      : print relocations\n");
 313         fprintf(stderr, "       -z      : compressed flat file\n");
 314         fprintf(stderr, "       -d      : compressed data-only flat file\n");
 315         fprintf(stderr, "       -Z      : un-compressed flat file\n");
 316         fprintf(stderr, "       -r      : ram load\n");
 317         fprintf(stderr, "       -R      : do not RAM load\n");
 318         fprintf(stderr, "       -k      : kernel traced load (for debug)\n");
 319         fprintf(stderr, "       -K      : normal non-kernel traced load\n");
 320         fprintf(stderr, "       -s size : stack size\n");
 321         fprintf(stderr, "       -o file : output-file\n"
 322                         "                 (default is to modify input file)\n");
 323         exit(1);
 324 }
 325
 326 /****************************************************************************/
 327
 328 int
 329 main(int argc, char *argv[])
 330 {
 331         int c;
 332         char *ofile = NULL, *ifile;
 333
 334         program_name = argv[0];
 335
 336         while ((c = getopt(argc, argv, "pPdzZrRkKs:o:")) != EOF) {
 337                 switch (c) {
 338                 case 'p': print = 1;                break;
 339                 case 'P': print_relocs = 1;         break;
 340                 case 'z': docompress = 1;           break;
 341                 case 'd': docompress = 2;           break;
 342                 case 'Z': docompress = -1;          break;
 343                 case 'r': ramload = 1;              break;
 344                 case 'R': ramload = -1;             break;
 345                 case 'k': ktrace = 1;               break;
 346                 case 'K': ktrace = -1;              break;
 347                 case 'o': ofile = optarg;           break;
 348                 case 's':
 349                         if (sscanf(optarg, "%i", &stacksize) != 1)
 350                                 usage("invalid stack size");
 351                         break;
 352                 default:
 353                         usage("invalid option");
 354                         break;
 355                 }
 356         }
 357
 358         if (optind >= argc)
 359                 usage("No input files provided");
 360
 361         if (ofile && argc - optind > 1)
 362                 usage("-o can only be used with a single file");
 363
 364         if (!print && !docompress && !ramload && !stacksize) /* no args == print */
 365                 print = argc - optind; /* greater than 1 is short format */
 366
 367         for (c = optind; c < argc; c++) {
 368                 ifile = argv[c];
 369                 if (!ofile)
 370                         ofile = ifile;
 371                 process_file(ifile, ofile);
 372                 ofile = NULL;
 373         }
 374
 375         exit(0);
 376 }
 377
 378 /****************************************************************************/