git.zerfleddert.de Git - proxmark3-svn/blob

1 //-----------------------------------------------------------------------------

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 //-----------------------------------------------------------------------------

11 #include <stdio.h>

12 #include <string.h>

13 #include <stdlib.h>

14 #include <inttypes.h>

15 #include <unistd.h>

16 #include "proxmark3.h"

17 #include "util.h"

18 #include "flash.h"

19 #include "elf.h"

20 #include "proxendian.h"

21 #include "usb_cmd.h"

 void SendCommand(UsbCommand* txcmd);

 void ReceiveCommand(UsbCommand* rxcmd);

25 void CloseProxmark();

 int OpenProxmark(size_t i);

28 // FIXME: what the fuckity fuck

29 unsigned int current_command = CMD_UNKNOWN;

31 #define FLASH_START 0x100000

32 #define FLASH_SIZE (256*1024)

33 #define FLASH_END (FLASH_START + FLASH_SIZE)

34 #define BOOTLOADER_SIZE 0x2000

35 #define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)

37 #define BLOCK_SIZE 0x200

39 static const uint8_t elf_ident[] = {

         0x7f, 'E', 'L', 'F',

41 ELFCLASS32,

42 ELFDATA2LSB,

43 EV_CURRENT

44 };

46 // Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent

47 // unaligned segments if needed

 static int build_segs_from_phdrs(flash_file_t *ctx, FILE *fd, Elf32_Phdr *phdrs, int num_phdrs)

49 {

50 Elf32_Phdr *phdr = phdrs;

51 flash_seg_t *seg;

52 uint32_t last_end = 0;

         ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);

55 if (!ctx->segments) {

                 fprintf(stderr, "Out of memory\n");

57 return -1;

58 }

59 ctx->num_segs = 0;

60 seg = ctx->segments;

         fprintf(stderr, "Loading usable ELF segments:\n");

         for (int i = 0; i < num_phdrs; i++) {

                 if (le32(phdr->p_type) != PT_LOAD) {

65 phdr++;

66 continue;

67 }

                 uint32_t vaddr = le32(phdr->p_vaddr);

                 uint32_t paddr = le32(phdr->p_paddr);

                 uint32_t filesz = le32(phdr->p_filesz);

                 uint32_t memsz = le32(phdr->p_memsz);

                 uint32_t offset = le32(phdr->p_offset);

                 uint32_t flags = le32(phdr->p_flags);

74 if (!filesz) {

75 phdr++;

76 continue;

77 }

                 fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",

                         i, vaddr, paddr, filesz, memsz,

                         flags & PF_R ? 'R' : ' ',

                         flags & PF_W ? 'W' : ' ',

                         flags & PF_X ? 'X' : ' ',

83 offset);

84 if (filesz != memsz) {

                         fprintf(stderr, "Error: PHDR file size does not equal memory size\n"

86 "(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");

87 return -1;

88 }

89 if (paddr < last_end) {

                         fprintf(stderr, "Error: PHDRs not sorted or overlap\n");

91 return -1;

92 }

                 if (paddr < FLASH_START || (paddr+filesz) > FLASH_END) {

                         fprintf(stderr, "Error: PHDR is not contained in Flash\n");

95 return -1;

96 }

                 if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {

                         fprintf(stderr, "Error: Flash VMA segment is writable\n");

99 return -1;

100 }

101

102 uint8_t *data;

103 // make extra space if we need to move the data forward

                 data = malloc(filesz + BLOCK_SIZE);

105 if (!data) {

                         fprintf(stderr, "Out of memory\n");

107 return -1;

108 }

                 if (fseek(fd, offset, SEEK_SET) < 0 || fread(data, 1, filesz, fd) != filesz) {

                         fprintf(stderr, "Error while reading PHDR payload\n");

111 free(data);

112 return -1;

113 }

114

                 uint32_t block_offset = paddr & (BLOCK_SIZE-1);

116 if (block_offset) {

117 if (ctx->num_segs) {

                                 flash_seg_t *prev_seg = seg - 1;

119 uint32_t this_end = paddr + filesz;

                                 uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);

                                 uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);

122

123 if (this_firstblock == prev_lastblock) {

                                         uint32_t new_length = this_end - prev_seg->start;

                                         uint32_t this_offset = paddr - prev_seg->start;

                                         uint32_t hole = this_offset - prev_seg->length;

                                         uint8_t *new_data = malloc(new_length);

128 if (!new_data) {

                                                 fprintf(stderr, "Out of memory\n");

130 free(data);

131 return -1;

132 }

                                         memset(new_data, 0xff, new_length);

                                         memcpy(new_data, prev_seg->data, prev_seg->length);

                                         memcpy(new_data + this_offset, data, filesz);

                                         fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",

137 prev_seg->length, new_length);

138 if (hole)

                                                 fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);

140 free(data);

141 free(prev_seg->data);

142 prev_seg->data = new_data;

143 prev_seg->length = new_length;

144 last_end = this_end;

145 phdr++;

146 continue;

147 }

148 }

                         fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");

                         memmove(data + block_offset, data, filesz);

                         memset(data, 0xFF, block_offset);

152 filesz += block_offset;

153 paddr -= block_offset;

154 }

155

156 seg->data = data;

157 seg->start = paddr;

158 seg->length = filesz;

159 seg++;

160 ctx->num_segs++;

161

162 last_end = paddr + filesz;

163 phdr++;

164 }

165 return 0;

166 }

167

168 // Sanity check segments and check for bootloader writes

 static int check_segs(flash_file_t *ctx, int can_write_bl) {

         for (int i = 0; i < ctx->num_segs; i++) {

                 flash_seg_t *seg = &ctx->segments[i];

172

                 if (seg->start & (BLOCK_SIZE-1)) {

                         fprintf(stderr, "Error: Segment is not aligned\n");

175 return -1;

176 }

                 if (seg->start < FLASH_START) {

                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");

179 return -1;

180 }

                 if (seg->start + seg->length > FLASH_END) {

                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");

183 return -1;

184 }

                 if (!can_write_bl && seg->start < BOOTLOADER_END) {

                         fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");

187 return -1;

188 }

189 }

190 return 0;

191 }

192

193 // Load an ELF file and prepare it for flashing

 int flash_load(flash_file_t *ctx, const char *name, int can_write_bl)

195 {

196 FILE *fd = NULL;

197 Elf32_Ehdr ehdr;

198 Elf32_Phdr *phdrs = NULL;

199 int num_phdrs;

200 int res;

201

         fd = fopen(name, "rb");

203 if (!fd) {

                 fprintf(stderr, "Could not open file '%s': ", name);

205 perror(NULL);

206 goto fail;

207 }

208

         fprintf(stderr, "Loading ELF file '%s'...\n", name);

210

         if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {

                 fprintf(stderr, "Error while reading ELF file header\n");

213 goto fail;

214 }

         if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))

                 || le32(ehdr.e_version) != 1)

217 {

                 fprintf(stderr, "Not an ELF file or wrong ELF type\n");

219 goto fail;

220 }

         if (le16(ehdr.e_type) != ET_EXEC) {

                 fprintf(stderr, "ELF is not executable\n");

223 goto fail;

224 }

         if (le16(ehdr.e_machine) != EM_ARM) {

                 fprintf(stderr, "Wrong ELF architecture\n");

227 goto fail;

228 }

         if (!ehdr.e_phnum || !ehdr.e_phoff) {

                 fprintf(stderr, "ELF has no PHDRs\n");

231 goto fail;

232 }

         if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {

234 // could be a structure padding issue...

                 fprintf(stderr, "Either the ELF file or this code is made of fail\n");

236 goto fail;

237 }

         num_phdrs = le16(ehdr.e_phnum);

239

         phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));

241 if (!phdrs) {

                 fprintf(stderr, "Out of memory\n");

243 goto fail;

244 }

         if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {

                 fprintf(stderr, "Error while reading ELF PHDRs\n");

247 goto fail;

248 }

         if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {

                 fprintf(stderr, "Error while reading ELF PHDRs\n");

251 goto fail;

252 }

253

         res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);

         if (res < 0)

256 goto fail;

         res = check_segs(ctx, can_write_bl);

         if (res < 0)

259 goto fail;

260

261 free(phdrs);

262 fclose(fd);

263 ctx->filename = name;

264 return 0;

265

266 fail:

267 if (phdrs)

268 free(phdrs);

269 if (fd)

270 fclose(fd);

271 flash_free(ctx);

272 return -1;

273 }

274

275 // Get the state of the proxmark, backwards compatible

 static int get_proxmark_state(uint32_t *state)

277 {

278 UsbCommand c;

279 c.cmd = CMD_DEVICE_INFO;

280 SendCommand(&c);

281 UsbCommand resp;

282 ReceiveCommand(&resp);

283

284 // Three outcomes:

285 // 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK

286 // 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"

287 // 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags

288

289 switch (resp.cmd) {

290 case CMD_ACK:

291 *state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;

292 break;

293 case CMD_DEBUG_PRINT_STRING:

294 *state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;

295 break;

296 case CMD_DEVICE_INFO:

                         *state = resp.arg[0];

298 break;

299 default:

                         fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04" PRIx64 "\n", resp.cmd);

301 return -1;

302 break;

303 }

304

305 return 0;

306 }

307

308 // Enter the bootloader to be able to start flashing

 static int enter_bootloader(char *serial_port_name)

310 {

311 uint32_t state;

312

         if (get_proxmark_state(&state) < 0)

314 return -1;

315

316 if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {

317 /* Already in flash state, we're done. */

318 return 0;

319 }

320

321 if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {

                 fprintf(stderr,"Entering bootloader...\n");

323 UsbCommand c;

                 memset(&c, 0, sizeof (c));

325

326 if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)

327 && (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))

328 {

329 // New style handover: Send CMD_START_FLASH, which will reset the board

330 // and enter the bootrom on the next boot.

331 c.cmd = CMD_START_FLASH;

332 SendCommand(&c);

                         fprintf(stderr,"(Press and release the button only to abort)\n");

334 } else {

335 // Old style handover: Ask the user to press the button, then reset the board

336 c.cmd = CMD_HARDWARE_RESET;

337 SendCommand(&c);

                         fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");

339 }

340 msleep(100);

341 CloseProxmark();

342

                 fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);

344 do {

345 sleep(1);

                         fprintf(stderr, ".");

                 } while (!OpenProxmark(0));

                 fprintf(stderr," Found.\n");

349

350 return 0;

351 }

352

         fprintf(stderr, "Error: Unknown Proxmark mode\n");

354 return -1;

355 }

356

 static int wait_for_ack(void)

358 {

359 UsbCommand ack;

360 ReceiveCommand(&ack);

         if (ack.cmd != CMD_ACK) {

                 printf("Error: Unexpected reply 0x%04" PRIx64 " (expected ACK)\n", ack.cmd);

363 return -1;

364 }

365 return 0;

366 }

367

368 // Go into flashing mode

 int flash_start_flashing(int enable_bl_writes,char *serial_port_name)

370 {

371 uint32_t state;

372

         if (enter_bootloader(serial_port_name) < 0)

374 return -1;

375

         if (get_proxmark_state(&state) < 0)

377 return -1;

378

379 if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {

380 // This command is stupid. Why the heck does it care which area we're

381 // flashing, as long as it's not the bootloader area? The mind boggles.

382 UsbCommand c = {CMD_START_FLASH};

383

384 if (enable_bl_writes) {

                         c.arg[0] = FLASH_START;

                         c.arg[1] = FLASH_END;

                         c.arg[2] = START_FLASH_MAGIC;

388 } else {

                         c.arg[0] = BOOTLOADER_END;

                         c.arg[1] = FLASH_END;

                         c.arg[2] = 0;

392 }

393 SendCommand(&c);

394 return wait_for_ack();

395 } else {

                 fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");

                 fprintf(stderr, "      It is recommended that you update your bootloader\n\n");

398 }

399

400 return 0;

401 }

402

 static int write_block(uint32_t address, uint8_t *data, uint32_t length)

404 {

405 uint8_t block_buf[BLOCK_SIZE];

406

         memset(block_buf, 0xFF, BLOCK_SIZE);

         memcpy(block_buf, data, length);

409 UsbCommand c;

410 c.cmd = CMD_FINISH_WRITE;

         c.arg[0] = address;

         memcpy(c.d.asBytes, block_buf, length);

413 SendCommand(&c);

414 return wait_for_ack();

415 }

416

417 // Write a file's segments to Flash

 int flash_write(flash_file_t *ctx)

419 {

         fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);

         for (int i = 0; i < ctx->num_segs; i++) {

                 flash_seg_t *seg = &ctx->segments[i];

423

424 uint32_t length = seg->length;

                 uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;

                 uint32_t end = seg->start + length;

427

                 fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",

                         seg->start, end - 1, length, blocks);

430

431 int block = 0;

                 uint8_t *data = seg->data;

433 uint32_t baddr = seg->start;

434

435 while (length) {

436 uint32_t block_size = length;

437 if (block_size > BLOCK_SIZE)

438 block_size = BLOCK_SIZE;

439

                         if (write_block(baddr, data, block_size) < 0) {

                                 fprintf(stderr, " ERROR\n");

                                 fprintf(stderr, "Error writing block %d of %d\n", block, blocks);

443 return -1;

444 }

445

446 data += block_size;

447 baddr += block_size;

448 length -= block_size;

449 block++;

                         fprintf(stderr, ".");

451 }

                 fprintf(stderr, " OK\n");

453 }

454 return 0;

455 }

456

457 // free a file context

 void flash_free(flash_file_t *ctx)

459 {

460 if (!ctx)

461 return;

462 if (ctx->segments) {

                 for (int i = 0; i < ctx->num_segs; i++)

                         free(ctx->segments[i].data);

465 free(ctx->segments);

466 ctx->segments = NULL;

467 ctx->num_segs = 0;

468 }

469 }

470

471 // just reset the unit

 int flash_stop_flashing(void) {

473 UsbCommand c = {CMD_HARDWARE_RESET};

474 SendCommand(&c);

475 msleep(100);

476 return 0;

477 }