cvs.zerfleddert.de Git - proxmark3-svn/blob - client/flash.c

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) 2010 Hector Martin "marcan" <marcan@marcansoft.com>
   3 //
   4 // This code is licensed to you under the terms of the GNU GPL, version 2 or,
   5 // at your option, any later version. See the LICENSE.txt file for the text of
   6 // the license.
   7 //-----------------------------------------------------------------------------
   8 // ELF file flasher
   9 //-----------------------------------------------------------------------------
  10
  11 #include <stdio.h>
  12 #include <string.h>
  13 #include <stdlib.h>
  14 #include "sleep.h"
  15 #include "proxusb.h"
  16 #include "flash.h"
  17 #include "elf.h"
  18 #include "proxendian.h"
  19
  20 //static uint32_t ExpectedAddr;
  21 //static uint8_t QueuedToSend[256];
  22
  23 // TODO: what the fuckity fuck
  24 unsigned int current_command = CMD_UNKNOWN;
  25
  26 #define FLASH_START            0x100000
  27 #define FLASH_SIZE             (256*1024)
  28 #define FLASH_END              (FLASH_START + FLASH_SIZE)
  29 #define BOOTLOADER_SIZE        0x2000
  30 #define BOOTLOADER_END         (FLASH_START + BOOTLOADER_SIZE)
  31
  32 #define BLOCK_SIZE             0x100
  33
  34 static const uint8_t elf_ident[] = {
  35         0x7f, 'E', 'L', 'F',
  36         ELFCLASS32,
  37         ELFDATA2LSB,
  38         EV_CURRENT
  39 };
  40
  41 // Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
  42 // unaligned segments if needed
  43 static int build_segs_from_phdrs(flash_file_t *ctx, FILE *fd, Elf32_Phdr *phdrs, int num_phdrs)
  44 {
  45         Elf32_Phdr *phdr = phdrs;
  46         flash_seg_t *seg;
  47         uint32_t last_end = 0;
  48
  49         ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
  50         if (!ctx->segments) {
  51                 fprintf(stderr, "Out of memory\n");
  52                 return -1;
  53         }
  54         ctx->num_segs = 0;
  55         seg = ctx->segments;
  56
  57         fprintf(stderr, "Loading usable ELF segments:\n");
  58         for (int i = 0; i < num_phdrs; i++) {
  59                 if (le32(phdr->p_type) != PT_LOAD) {
  60                         phdr++;
  61                         continue;
  62                 }
  63                 uint32_t vaddr = le32(phdr->p_vaddr);
  64                 uint32_t paddr = le32(phdr->p_paddr);
  65                 uint32_t filesz = le32(phdr->p_filesz);
  66                 uint32_t memsz = le32(phdr->p_memsz);
  67                 uint32_t offset = le32(phdr->p_offset);
  68                 uint32_t flags = le32(phdr->p_flags);
  69                 if (!filesz) {
  70                         phdr++;
  71                         continue;
  72                 }
  73                 fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
  74                         i, vaddr, paddr, filesz, memsz,
  75                         flags & PF_R ? 'R' : ' ',
  76                         flags & PF_W ? 'W' : ' ',
  77                         flags & PF_X ? 'X' : ' ',
  78                         offset);
  79                 if (filesz != memsz) {
  80                         fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
  81                                         "(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
  82                         return -1;
  83                 }
  84                 if (paddr < last_end) {
  85                         fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
  86                         return -1;
  87                 }
  88                 if (paddr < FLASH_START || (paddr+filesz) > FLASH_END) {
  89                         fprintf(stderr, "Error: PHDR is not contained in Flash\n");
  90                         return -1;
  91                 }
  92                 if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
  93                         fprintf(stderr, "Error: Flash VMA segment is writable\n");
  94                         return -1;
  95                 }
  96
  97                 uint8_t *data;
  98                 // make extra space if we need to move the data forward
  99                 data = malloc(filesz + BLOCK_SIZE);
 100                 if (!data) {
 101                         fprintf(stderr, "Out of memory\n");
 102                         return -1;
 103                 }
 104                 if (fseek(fd, offset, SEEK_SET) < 0 || fread(data, 1, filesz, fd) != filesz) {
 105                         fprintf(stderr, "Error while reading PHDR payload\n");
 106                         free(data);
 107                         return -1;
 108                 }
 109
 110                 uint32_t block_offset = paddr & (BLOCK_SIZE-1);
 111                 if (block_offset) {
 112                         if (ctx->num_segs) {
 113                                 flash_seg_t *prev_seg = seg - 1;
 114                                 uint32_t this_end = paddr + filesz;
 115                                 uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
 116                                 uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
 117
 118                                 if (this_firstblock == prev_lastblock) {
 119                                         uint32_t new_length = this_end - prev_seg->start;
 120                                         uint32_t this_offset = paddr - prev_seg->start;
 121                                         uint32_t hole = this_offset - prev_seg->length;
 122                                         uint8_t *new_data = malloc(new_length);
 123                                         if (!new_data) {
 124                                                 fprintf(stderr, "Out of memory\n");
 125                                                 free(data);
 126                                                 return -1;
 127                                         }
 128                                         memset(new_data, 0xff, new_length);
 129                                         memcpy(new_data, prev_seg->data, prev_seg->length);
 130                                         memcpy(new_data + this_offset, data, filesz);
 131                                         fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
 132                                                 prev_seg->length, new_length);
 133                                         if (hole)
 134                                                 fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
 135                                         free(data);
 136                                         free(prev_seg->data);
 137                                         prev_seg->data = new_data;
 138                                         prev_seg->length = new_length;
 139                                         last_end = this_end;
 140                                         phdr++;
 141                                         continue;
 142                                 }
 143                         }
 144                         fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
 145                         memmove(data + block_offset, data, filesz);
 146                         memset(data, 0xFF, block_offset);
 147                         filesz += block_offset;
 148                         paddr -= block_offset;
 149                 }
 150
 151                 seg->data = data;
 152                 seg->start = paddr;
 153                 seg->length = filesz;
 154                 seg++;
 155                 ctx->num_segs++;
 156
 157                 last_end = paddr + filesz;
 158                 phdr++;
 159         }
 160         return 0;
 161 }
 162
 163 // Sanity check segments and check for bootloader writes
 164 static int check_segs(flash_file_t *ctx, int can_write_bl) {
 165         for (int i = 0; i < ctx->num_segs; i++) {
 166                 flash_seg_t *seg = &ctx->segments[i];
 167
 168                 if (seg->start & (BLOCK_SIZE-1)) {
 169                         fprintf(stderr, "Error: Segment is not aligned\n");
 170                         return -1;
 171                 }
 172                 if (seg->start < FLASH_START) {
 173                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");
 174                         return -1;
 175                 }
 176                 if (seg->start + seg->length > FLASH_END) {
 177                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");
 178                         return -1;
 179                 }
 180                 if (!can_write_bl && seg->start < BOOTLOADER_END) {
 181                         fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
 182                         return -1;
 183                 }
 184         }
 185         return 0;
 186 }
 187
 188 // Load an ELF file and prepare it for flashing
 189 int flash_load(flash_file_t *ctx, const char *name, int can_write_bl)
 190 {
 191         FILE *fd = NULL;
 192         Elf32_Ehdr ehdr;
 193         Elf32_Phdr *phdrs = NULL;
 194         int num_phdrs;
 195         int res;
 196
 197         fd = fopen(name, "rb");
 198         if (!fd) {
 199                 fprintf(stderr, "Could not open file '%s': ", name);
 200                 perror(NULL);
 201                 goto fail;
 202         }
 203
 204         fprintf(stderr, "Loading ELF file '%s'...\n", name);
 205
 206         if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
 207                 fprintf(stderr, "Error while reading ELF file header\n");
 208                 goto fail;
 209         }
 210         if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
 211                 || le32(ehdr.e_version) != 1)
 212         {
 213                 fprintf(stderr, "Not an ELF file or wrong ELF type\n");
 214                 goto fail;
 215         }
 216         if (le16(ehdr.e_type) != ET_EXEC) {
 217                 fprintf(stderr, "ELF is not executable\n");
 218                 goto fail;
 219         }
 220         if (le16(ehdr.e_machine) != EM_ARM) {
 221                 fprintf(stderr, "Wrong ELF architecture\n");
 222                 goto fail;
 223         }
 224         if (!ehdr.e_phnum || !ehdr.e_phoff) {
 225                 fprintf(stderr, "ELF has no PHDRs\n");
 226                 goto fail;
 227         }
 228         if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
 229                 // could be a structure padding issue...
 230                 fprintf(stderr, "Either the ELF file or this code is made of fail\n");
 231                 goto fail;
 232         }
 233         num_phdrs = le16(ehdr.e_phnum);
 234
 235         phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
 236         if (!phdrs) {
 237                 fprintf(stderr, "Out of memory\n");
 238                 goto fail;
 239         }
 240         if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
 241                 fprintf(stderr, "Error while reading ELF PHDRs\n");
 242                 goto fail;
 243         }
 244         if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
 245                 fprintf(stderr, "Error while reading ELF PHDRs\n");
 246                 goto fail;
 247         }
 248
 249         res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
 250         if (res < 0)
 251                 goto fail;
 252         res = check_segs(ctx, can_write_bl);
 253         if (res < 0)
 254                 goto fail;
 255
 256         fclose(fd);
 257         ctx->filename = name;
 258         return 0;
 259
 260 fail:
 261         if (phdrs)
 262                 free(phdrs);
 263         if (fd)
 264                 fclose(fd);
 265         flash_free(ctx);
 266         return -1;
 267 }
 268
 269 // Get the state of the proxmark, backwards compatible
 270 static int get_proxmark_state(uint32_t *state)
 271 {
 272         UsbCommand c;
 273         c.cmd = CMD_DEVICE_INFO;
 274         SendCommand(&c);
 275
 276         UsbCommand resp;
 277         ReceiveCommand(&resp);
 278
 279         // Three outcomes:
 280         // 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
 281         // 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
 282         // 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
 283
 284         switch (resp.cmd) {
 285                 case CMD_ACK:
 286                         *state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
 287                         break;
 288                 case CMD_DEBUG_PRINT_STRING:
 289                         *state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
 290                         break;
 291                 case CMD_DEVICE_INFO:
 292                         *state = resp.arg[0];
 293                         break;
 294                 default:
 295                         fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04x\n", resp.cmd);
 296                         return -1;
 297                         break;
 298         }
 299
 300         return 0;
 301 }
 302
 303 // Enter the bootloader to be able to start flashing
 304 static int enter_bootloader(void)
 305 {
 306         uint32_t state;
 307
 308         if (get_proxmark_state(&state) < 0)
 309                 return -1;
 310
 311         if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
 312                 /* Already in flash state, we're done. */
 313                 return 0;
 314         }
 315
 316         if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
 317                 fprintf(stderr,"Entering bootloader...\n");
 318                 UsbCommand c;
 319                 memset(&c, 0, sizeof (c));
 320
 321                 if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
 322                         && (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
 323                 {
 324                         // New style handover: Send CMD_START_FLASH, which will reset the board
 325                         // and enter the bootrom on the next boot.
 326                         c.cmd = CMD_START_FLASH;
 327                         SendCommand(&c);
 328                         fprintf(stderr,"(Press and release the button only to abort)\n");
 329                 } else {
 330                         // Old style handover: Ask the user to press the button, then reset the board
 331                         c.cmd = CMD_HARDWARE_RESET;
 332                         SendCommand(&c);
 333                         fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
 334                 }
 335                 fprintf(stderr,"Waiting for Proxmark to reappear on USB...");
 336
 337                 CloseProxmark();
 338                 sleep(1);
 339                 while (!OpenProxmark(0)) {
 340                         sleep(1);
 341                         fprintf(stderr, ".");
 342                 }
 343                 fprintf(stderr," Found.\n");
 344
 345                 return 0;
 346         }
 347
 348         fprintf(stderr, "Error: Unknown Proxmark mode\n");
 349         return -1;
 350 }
 351
 352 static int wait_for_ack(void)
 353 {
 354         UsbCommand ack;
 355         ReceiveCommand(&ack);
 356         if (ack.cmd != CMD_ACK) {
 357                 printf("Error: Unexpected reply 0x%04x (expected ACK)\n", ack.cmd);
 358                 return -1;
 359         }
 360         return 0;
 361 }
 362
 363 // Go into flashing mode
 364 int flash_start_flashing(int enable_bl_writes)
 365 {
 366         uint32_t state;
 367
 368         if (enter_bootloader() < 0)
 369                 return -1;
 370
 371         if (get_proxmark_state(&state) < 0)
 372                 return -1;
 373
 374         if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
 375                 // This command is stupid. Why the heck does it care which area we're
 376                 // flashing, as long as it's not the bootloader area? The mind boggles.
 377                 UsbCommand c = {CMD_START_FLASH};
 378
 379                 if (enable_bl_writes) {
 380                         c.arg[0] = FLASH_START;
 381                         c.arg[1] = FLASH_END;
 382                         c.arg[2] = START_FLASH_MAGIC;
 383                 } else {
 384                         c.arg[0] = BOOTLOADER_END;
 385                         c.arg[1] = FLASH_END;
 386                         c.arg[2] = 0;
 387                 }
 388                 SendCommand(&c);
 389                 return wait_for_ack();
 390         } else {
 391                 fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
 392                 fprintf(stderr, "      It is recommended that you update your bootloader\n\n");
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int write_block(uint32_t address, uint8_t *data, uint32_t length)
 399 {
 400         uint8_t block_buf[BLOCK_SIZE];
 401
 402         memset(block_buf, 0xFF, BLOCK_SIZE);
 403         memcpy(block_buf, data, length);
 404
 405         UsbCommand c = {CMD_SETUP_WRITE};
 406         for (int i = 0; i < 240; i += 48) {
 407                 memcpy(c.d.asBytes, block_buf + i, 48);
 408                 c.arg[0] = i / 4;
 409                 SendCommand(&c);
 410                 if (wait_for_ack() < 0)
 411                         return -1;
 412         }
 413
 414         c.cmd = CMD_FINISH_WRITE;
 415         c.arg[0] = address;
 416         memcpy(c.d.asBytes, block_buf+240, 16);
 417         SendCommand(&c);
 418         return wait_for_ack();
 419 }
 420
 421 // Write a file's segments to Flash
 422 int flash_write(flash_file_t *ctx)
 423 {
 424         fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
 425         for (int i = 0; i < ctx->num_segs; i++) {
 426                 flash_seg_t *seg = &ctx->segments[i];
 427
 428                 uint32_t length = seg->length;
 429                 uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
 430                 uint32_t end = seg->start + length;
 431
 432                 fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
 433                         seg->start, end - 1, length, blocks);
 434
 435                 int block = 0;
 436                 uint8_t *data = seg->data;
 437                 uint32_t baddr = seg->start;
 438
 439                 while (length) {
 440                         uint32_t block_size = length;
 441                         if (block_size > BLOCK_SIZE)
 442                                 block_size = BLOCK_SIZE;
 443
 444                         if (write_block(baddr, data, block_size) < 0) {
 445                                 fprintf(stderr, " ERROR\n");
 446                                 fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
 447                                 return -1;
 448                         }
 449
 450                         data += block_size;
 451                         baddr += block_size;
 452                         length -= block_size;
 453                         block++;
 454                         fprintf(stderr, ".");
 455                 }
 456                 fprintf(stderr, " OK\n");
 457         }
 458         return 0;
 459 }
 460
 461 // free a file context
 462 void flash_free(flash_file_t *ctx)
 463 {
 464         if (!ctx)
 465                 return;
 466         if (ctx->segments) {
 467                 for (int i = 0; i < ctx->num_segs; i++)
 468                         free(ctx->segments[i].data);
 469                 free(ctx->segments);
 470                 ctx->segments = NULL;
 471                 ctx->num_segs = 0;
 472         }
 473 }
 474
 475 // just reset the unit
 476 int flash_stop_flashing(void) {
 477         UsbCommand c = {CMD_HARDWARE_RESET};
 478         SendCommand(&c);
 479         return 0;
 480 }