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