git.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 <inttypes.h>
  15 #include <unistd.h>
  16 #include "proxmark3.h"
  17 #include "util.h"
  18 #include "util_posix.h"
  19 #include "flash.h"
  20 #include "elf.h"
  21 #include "proxendian.h"
  22 #include "usb_cmd.h"
  23 #include "uart.h"
  24
  25 void SendCommand(UsbCommand* txcmd);
  26 void ReceiveCommand(UsbCommand* rxcmd);
  27
  28 serial_port sp;
  29
  30 // FIXME: what the fuckity fuck
  31 unsigned int current_command = CMD_UNKNOWN;
  32
  33 #define FLASH_START            0x100000
  34 #define FLASH_SIZE             (256*1024)
  35 #define FLASH_END              (FLASH_START + FLASH_SIZE)
  36 #define BOOTLOADER_SIZE        0x2000
  37 #define BOOTLOADER_END         (FLASH_START + BOOTLOADER_SIZE)
  38
  39 #define BLOCK_SIZE             0x200
  40
  41 static const uint8_t elf_ident[] = {
  42         0x7f, 'E', 'L', 'F',
  43         ELFCLASS32,
  44         ELFDATA2LSB,
  45         EV_CURRENT
  46 };
  47
  48 void CloseProxmark(const char *serial_port_name) {
  49         // Clean up the port
  50         uart_close(sp);
  51         // Fix for linux, it seems that it is extremely slow to release the serial port file descriptor /dev/*
  52         unlink(serial_port_name);
  53 }
  54
  55 int OpenProxmark(size_t i, const char *serial_port_name) {
  56         sp = uart_open(serial_port_name);
  57         if (sp == INVALID_SERIAL_PORT || sp == CLAIMED_SERIAL_PORT) {
  58                 //poll once a second
  59                 return 0;
  60         }
  61         return 1;
  62 }
  63
  64 // Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
  65 // unaligned segments if needed
  66 static int build_segs_from_phdrs(flash_file_t *ctx, FILE *fd, Elf32_Phdr *phdrs, int num_phdrs)
  67 {
  68         Elf32_Phdr *phdr = phdrs;
  69         flash_seg_t *seg;
  70         uint32_t last_end = 0;
  71
  72         ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
  73         if (!ctx->segments) {
  74                 fprintf(stderr, "Out of memory\n");
  75                 return -1;
  76         }
  77         ctx->num_segs = 0;
  78         seg = ctx->segments;
  79
  80         fprintf(stderr, "Loading usable ELF segments:\n");
  81         for (int i = 0; i < num_phdrs; i++) {
  82                 if (le32(phdr->p_type) != PT_LOAD) {
  83                         phdr++;
  84                         continue;
  85                 }
  86                 uint32_t vaddr = le32(phdr->p_vaddr);
  87                 uint32_t paddr = le32(phdr->p_paddr);
  88                 uint32_t filesz = le32(phdr->p_filesz);
  89                 uint32_t memsz = le32(phdr->p_memsz);
  90                 uint32_t offset = le32(phdr->p_offset);
  91                 uint32_t flags = le32(phdr->p_flags);
  92                 if (!filesz) {
  93                         phdr++;
  94                         continue;
  95                 }
  96                 fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
  97                         i, vaddr, paddr, filesz, memsz,
  98                         flags & PF_R ? 'R' : ' ',
  99                         flags & PF_W ? 'W' : ' ',
 100                         flags & PF_X ? 'X' : ' ',
 101                         offset);
 102                 if (filesz != memsz) {
 103                         fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
 104                                         "(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
 105                         return -1;
 106                 }
 107                 if (paddr < last_end) {
 108                         fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
 109                         return -1;
 110                 }
 111                 if (paddr < FLASH_START || (paddr+filesz) > FLASH_END) {
 112                         fprintf(stderr, "Error: PHDR is not contained in Flash\n");
 113                         return -1;
 114                 }
 115                 if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
 116                         fprintf(stderr, "Error: Flash VMA segment is writable\n");
 117                         return -1;
 118                 }
 119
 120                 uint8_t *data;
 121                 // make extra space if we need to move the data forward
 122                 data = malloc(filesz + BLOCK_SIZE);
 123                 if (!data) {
 124                         fprintf(stderr, "Out of memory\n");
 125                         return -1;
 126                 }
 127                 if (fseek(fd, offset, SEEK_SET) < 0 || fread(data, 1, filesz, fd) != filesz) {
 128                         fprintf(stderr, "Error while reading PHDR payload\n");
 129                         free(data);
 130                         return -1;
 131                 }
 132
 133                 uint32_t block_offset = paddr & (BLOCK_SIZE-1);
 134                 if (block_offset) {
 135                         if (ctx->num_segs) {
 136                                 flash_seg_t *prev_seg = seg - 1;
 137                                 uint32_t this_end = paddr + filesz;
 138                                 uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
 139                                 uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
 140
 141                                 if (this_firstblock == prev_lastblock) {
 142                                         uint32_t new_length = this_end - prev_seg->start;
 143                                         uint32_t this_offset = paddr - prev_seg->start;
 144                                         uint32_t hole = this_offset - prev_seg->length;
 145                                         uint8_t *new_data = malloc(new_length);
 146                                         if (!new_data) {
 147                                                 fprintf(stderr, "Out of memory\n");
 148                                                 free(data);
 149                                                 return -1;
 150                                         }
 151                                         memset(new_data, 0xff, new_length);
 152                                         memcpy(new_data, prev_seg->data, prev_seg->length);
 153                                         memcpy(new_data + this_offset, data, filesz);
 154                                         fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
 155                                                 prev_seg->length, new_length);
 156                                         if (hole)
 157                                                 fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
 158                                         free(data);
 159                                         free(prev_seg->data);
 160                                         prev_seg->data = new_data;
 161                                         prev_seg->length = new_length;
 162                                         last_end = this_end;
 163                                         phdr++;
 164                                         continue;
 165                                 }
 166                         }
 167                         fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
 168                         memmove(data + block_offset, data, filesz);
 169                         memset(data, 0xFF, block_offset);
 170                         filesz += block_offset;
 171                         paddr -= block_offset;
 172                 }
 173
 174                 seg->data = data;
 175                 seg->start = paddr;
 176                 seg->length = filesz;
 177                 seg++;
 178                 ctx->num_segs++;
 179
 180                 last_end = paddr + filesz;
 181                 phdr++;
 182         }
 183         return 0;
 184 }
 185
 186 // Sanity check segments and check for bootloader writes
 187 static int check_segs(flash_file_t *ctx, int can_write_bl) {
 188         for (int i = 0; i < ctx->num_segs; i++) {
 189                 flash_seg_t *seg = &ctx->segments[i];
 190
 191                 if (seg->start & (BLOCK_SIZE-1)) {
 192                         fprintf(stderr, "Error: Segment is not aligned\n");
 193                         return -1;
 194                 }
 195                 if (seg->start < FLASH_START) {
 196                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");
 197                         return -1;
 198                 }
 199                 if (seg->start + seg->length > FLASH_END) {
 200                         fprintf(stderr, "Error: Segment is outside of flash bounds\n");
 201                         return -1;
 202                 }
 203                 if (!can_write_bl && seg->start < BOOTLOADER_END) {
 204                         fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
 205                         return -1;
 206                 }
 207         }
 208         return 0;
 209 }
 210
 211 // Load an ELF file and prepare it for flashing
 212 int flash_load(flash_file_t *ctx, const char *name, int can_write_bl)
 213 {
 214         FILE *fd = NULL;
 215         Elf32_Ehdr ehdr;
 216         Elf32_Phdr *phdrs = NULL;
 217         int num_phdrs;
 218         int res;
 219
 220         fd = fopen(name, "rb");
 221         if (!fd) {
 222                 fprintf(stderr, "Could not open file '%s': ", name);
 223                 perror(NULL);
 224                 goto fail;
 225         }
 226
 227         fprintf(stderr, "Loading ELF file '%s'...\n", name);
 228
 229         if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
 230                 fprintf(stderr, "Error while reading ELF file header\n");
 231                 goto fail;
 232         }
 233         if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
 234                 || le32(ehdr.e_version) != 1)
 235         {
 236                 fprintf(stderr, "Not an ELF file or wrong ELF type\n");
 237                 goto fail;
 238         }
 239         if (le16(ehdr.e_type) != ET_EXEC) {
 240                 fprintf(stderr, "ELF is not executable\n");
 241                 goto fail;
 242         }
 243         if (le16(ehdr.e_machine) != EM_ARM) {
 244                 fprintf(stderr, "Wrong ELF architecture\n");
 245                 goto fail;
 246         }
 247         if (!ehdr.e_phnum || !ehdr.e_phoff) {
 248                 fprintf(stderr, "ELF has no PHDRs\n");
 249                 goto fail;
 250         }
 251         if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
 252                 // could be a structure padding issue...
 253                 fprintf(stderr, "Either the ELF file or this code is made of fail\n");
 254                 goto fail;
 255         }
 256         num_phdrs = le16(ehdr.e_phnum);
 257
 258         phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
 259         if (!phdrs) {
 260                 fprintf(stderr, "Out of memory\n");
 261                 goto fail;
 262         }
 263         if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
 264                 fprintf(stderr, "Error while reading ELF PHDRs\n");
 265                 goto fail;
 266         }
 267         if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
 268                 fprintf(stderr, "Error while reading ELF PHDRs\n");
 269                 goto fail;
 270         }
 271
 272         res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
 273         if (res < 0)
 274                 goto fail;
 275         res = check_segs(ctx, can_write_bl);
 276         if (res < 0)
 277                 goto fail;
 278
 279         free(phdrs);
 280         fclose(fd);
 281         ctx->filename = name;
 282         return 0;
 283
 284 fail:
 285         if (phdrs)
 286                 free(phdrs);
 287         if (fd)
 288                 fclose(fd);
 289         flash_free(ctx);
 290         return -1;
 291 }
 292
 293 // Get the state of the proxmark, backwards compatible
 294 static int get_proxmark_state(uint32_t *state)
 295 {
 296         UsbCommand c;
 297         c.cmd = CMD_DEVICE_INFO;
 298         SendCommand(&c);
 299         UsbCommand resp;
 300         ReceiveCommand(&resp);
 301
 302         // Three outcomes:
 303         // 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
 304         // 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
 305         // 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
 306
 307         switch (resp.cmd) {
 308                 case CMD_ACK:
 309                         *state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
 310                         break;
 311                 case CMD_DEBUG_PRINT_STRING:
 312                         *state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
 313                         break;
 314                 case CMD_DEVICE_INFO:
 315                         *state = resp.arg[0];
 316                         break;
 317                 default:
 318                         fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04" PRIx64 "\n", resp.cmd);
 319                         return -1;
 320                         break;
 321         }
 322
 323         return 0;
 324 }
 325
 326 // Enter the bootloader to be able to start flashing
 327 static int enter_bootloader(char *serial_port_name)
 328 {
 329         uint32_t state;
 330
 331         if (get_proxmark_state(&state) < 0)
 332                 return -1;
 333
 334         if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
 335                 /* Already in flash state, we're done. */
 336                 return 0;
 337         }
 338
 339         if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
 340                 fprintf(stderr,"Entering bootloader...\n");
 341                 UsbCommand c;
 342                 memset(&c, 0, sizeof (c));
 343
 344                 if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
 345                         && (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
 346                 {
 347                         // New style handover: Send CMD_START_FLASH, which will reset the board
 348                         // and enter the bootrom on the next boot.
 349                         c.cmd = CMD_START_FLASH;
 350                         SendCommand(&c);
 351                         fprintf(stderr,"(Press and release the button only to abort)\n");
 352                 } else {
 353                         // Old style handover: Ask the user to press the button, then reset the board
 354                         c.cmd = CMD_HARDWARE_RESET;
 355                         SendCommand(&c);
 356                         fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
 357                 }
 358                 msleep(100);
 359                 CloseProxmark(serial_port_name);
 360
 361                 fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
 362                 do {
 363                         sleep(1);
 364                         fprintf(stderr, ".");
 365                 } while (!OpenProxmark(0, serial_port_name));
 366                 fprintf(stderr," Found.\n");
 367
 368                 return 0;
 369         }
 370
 371         fprintf(stderr, "Error: Unknown Proxmark mode\n");
 372         return -1;
 373 }
 374
 375 static int wait_for_ack(void)
 376 {
 377         UsbCommand ack;
 378         ReceiveCommand(&ack);
 379         if (ack.cmd != CMD_ACK) {
 380                 printf("Error: Unexpected reply 0x%04" PRIx64 " (expected ACK)\n", ack.cmd);
 381                 return -1;
 382         }
 383         return 0;
 384 }
 385
 386 // Go into flashing mode
 387 int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
 388 {
 389         uint32_t state;
 390
 391         if (enter_bootloader(serial_port_name) < 0)
 392                 return -1;
 393
 394         if (get_proxmark_state(&state) < 0)
 395                 return -1;
 396
 397         if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
 398                 // This command is stupid. Why the heck does it care which area we're
 399                 // flashing, as long as it's not the bootloader area? The mind boggles.
 400                 UsbCommand c = {CMD_START_FLASH};
 401
 402                 if (enable_bl_writes) {
 403                         c.arg[0] = FLASH_START;
 404                         c.arg[1] = FLASH_END;
 405                         c.arg[2] = START_FLASH_MAGIC;
 406                 } else {
 407                         c.arg[0] = BOOTLOADER_END;
 408                         c.arg[1] = FLASH_END;
 409                         c.arg[2] = 0;
 410                 }
 411                 SendCommand(&c);
 412                 return wait_for_ack();
 413         } else {
 414                 fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
 415                 fprintf(stderr, "      It is recommended that you update your bootloader\n\n");
 416         }
 417
 418         return 0;
 419 }
 420
 421 static int write_block(uint32_t address, uint8_t *data, uint32_t length)
 422 {
 423         uint8_t block_buf[BLOCK_SIZE];
 424
 425         memset(block_buf, 0xFF, BLOCK_SIZE);
 426         memcpy(block_buf, data, length);
 427   UsbCommand c;
 428         c.cmd = CMD_FINISH_WRITE;
 429         c.arg[0] = address;
 430         memcpy(c.d.asBytes, block_buf, length);
 431   SendCommand(&c);
 432   return wait_for_ack();
 433 }
 434
 435 // Write a file's segments to Flash
 436 int flash_write(flash_file_t *ctx)
 437 {
 438         fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
 439         for (int i = 0; i < ctx->num_segs; i++) {
 440                 flash_seg_t *seg = &ctx->segments[i];
 441
 442                 uint32_t length = seg->length;
 443                 uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
 444                 uint32_t end = seg->start + length;
 445
 446                 fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
 447                         seg->start, end - 1, length, blocks);
 448
 449                 int block = 0;
 450                 uint8_t *data = seg->data;
 451                 uint32_t baddr = seg->start;
 452
 453                 while (length) {
 454                         uint32_t block_size = length;
 455                         if (block_size > BLOCK_SIZE)
 456                                 block_size = BLOCK_SIZE;
 457
 458                         if (write_block(baddr, data, block_size) < 0) {
 459                                 fprintf(stderr, " ERROR\n");
 460                                 fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
 461                                 return -1;
 462                         }
 463
 464                         data += block_size;
 465                         baddr += block_size;
 466                         length -= block_size;
 467                         block++;
 468                         fprintf(stderr, ".");
 469                 }
 470                 fprintf(stderr, " OK\n");
 471         }
 472         return 0;
 473 }
 474
 475 // free a file context
 476 void flash_free(flash_file_t *ctx)
 477 {
 478         if (!ctx)
 479                 return;
 480         if (ctx->segments) {
 481                 for (int i = 0; i < ctx->num_segs; i++)
 482                         free(ctx->segments[i].data);
 483                 free(ctx->segments);
 484                 ctx->segments = NULL;
 485                 ctx->num_segs = 0;
 486         }
 487 }
 488
 489 // just reset the unit
 490 int flash_stop_flashing(void) {
 491         UsbCommand c = {CMD_HARDWARE_RESET};
 492         SendCommand(&c);
 493         msleep(100);
 494         return 0;
 495 }