1 //-----------------------------------------------------------------------------
2 // Copyright (C) 2010 Hector Martin "marcan" <marcan@marcansoft.com>
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
7 //-----------------------------------------------------------------------------
9 //-----------------------------------------------------------------------------
17 #include "proxendian.h"
19 // FIXME: what the fuckity fuck
20 unsigned int current_command
= CMD_UNKNOWN
;
22 #define FLASH_START 0x100000
23 #define FLASH_SIZE (256*1024)
24 #define FLASH_END (FLASH_START + FLASH_SIZE)
25 #define BOOTLOADER_SIZE 0x2000
26 #define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
28 #define BLOCK_SIZE 0x100
30 static const uint8_t elf_ident
[] = {
37 // Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
38 // unaligned segments if needed
39 static int build_segs_from_phdrs(flash_file_t
*ctx
, FILE *fd
, Elf32_Phdr
*phdrs
, int num_phdrs
)
41 Elf32_Phdr
*phdr
= phdrs
;
43 uint32_t last_end
= 0;
45 ctx
->segments
= malloc(sizeof(flash_seg_t
) * num_phdrs
);
47 fprintf(stderr
, "Out of memory\n");
53 fprintf(stderr
, "Loading usable ELF segments:\n");
54 for (int i
= 0; i
< num_phdrs
; i
++) {
55 if (le32(phdr
->p_type
) != PT_LOAD
) {
59 uint32_t vaddr
= le32(phdr
->p_vaddr
);
60 uint32_t paddr
= le32(phdr
->p_paddr
);
61 uint32_t filesz
= le32(phdr
->p_filesz
);
62 uint32_t memsz
= le32(phdr
->p_memsz
);
63 uint32_t offset
= le32(phdr
->p_offset
);
64 uint32_t flags
= le32(phdr
->p_flags
);
69 fprintf(stderr
, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
70 i
, vaddr
, paddr
, filesz
, memsz
,
71 flags
& PF_R
? 'R' : ' ',
72 flags
& PF_W
? 'W' : ' ',
73 flags
& PF_X
? 'X' : ' ',
75 if (filesz
!= memsz
) {
76 fprintf(stderr
, "Error: PHDR file size does not equal memory size\n"
77 "(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
80 if (paddr
< last_end
) {
81 fprintf(stderr
, "Error: PHDRs not sorted or overlap\n");
84 if (paddr
< FLASH_START
|| (paddr
+filesz
) > FLASH_END
) {
85 fprintf(stderr
, "Error: PHDR is not contained in Flash\n");
88 if (vaddr
>= FLASH_START
&& vaddr
< FLASH_END
&& (flags
& PF_W
)) {
89 fprintf(stderr
, "Error: Flash VMA segment is writable\n");
94 // make extra space if we need to move the data forward
95 data
= malloc(filesz
+ BLOCK_SIZE
);
97 fprintf(stderr
, "Out of memory\n");
100 if (fseek(fd
, offset
, SEEK_SET
) < 0 || fread(data
, 1, filesz
, fd
) != filesz
) {
101 fprintf(stderr
, "Error while reading PHDR payload\n");
106 uint32_t block_offset
= paddr
& (BLOCK_SIZE
-1);
109 flash_seg_t
*prev_seg
= seg
- 1;
110 uint32_t this_end
= paddr
+ filesz
;
111 uint32_t this_firstblock
= paddr
& ~(BLOCK_SIZE
-1);
112 uint32_t prev_lastblock
= (last_end
- 1) & ~(BLOCK_SIZE
-1);
114 if (this_firstblock
== prev_lastblock
) {
115 uint32_t new_length
= this_end
- prev_seg
->start
;
116 uint32_t this_offset
= paddr
- prev_seg
->start
;
117 uint32_t hole
= this_offset
- prev_seg
->length
;
118 uint8_t *new_data
= malloc(new_length
);
120 fprintf(stderr
, "Out of memory\n");
124 memset(new_data
, 0xff, new_length
);
125 memcpy(new_data
, prev_seg
->data
, prev_seg
->length
);
126 memcpy(new_data
+ this_offset
, data
, filesz
);
127 fprintf(stderr
, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
128 prev_seg
->length
, new_length
);
130 fprintf(stderr
, "Note: 0x%x-byte hole created\n", hole
);
132 free(prev_seg
->data
);
133 prev_seg
->data
= new_data
;
134 prev_seg
->length
= new_length
;
140 fprintf(stderr
, "Warning: segment does not begin on a block boundary, will pad\n");
141 memmove(data
+ block_offset
, data
, filesz
);
142 memset(data
, 0xFF, block_offset
);
143 filesz
+= block_offset
;
144 paddr
-= block_offset
;
149 seg
->length
= filesz
;
153 last_end
= paddr
+ filesz
;
159 // Sanity check segments and check for bootloader writes
160 static int check_segs(flash_file_t
*ctx
, int can_write_bl
) {
161 for (int i
= 0; i
< ctx
->num_segs
; i
++) {
162 flash_seg_t
*seg
= &ctx
->segments
[i
];
164 if (seg
->start
& (BLOCK_SIZE
-1)) {
165 fprintf(stderr
, "Error: Segment is not aligned\n");
168 if (seg
->start
< FLASH_START
) {
169 fprintf(stderr
, "Error: Segment is outside of flash bounds\n");
172 if (seg
->start
+ seg
->length
> FLASH_END
) {
173 fprintf(stderr
, "Error: Segment is outside of flash bounds\n");
176 if (!can_write_bl
&& seg
->start
< BOOTLOADER_END
) {
177 fprintf(stderr
, "Attempted to write bootloader but bootloader writes are not enabled\n");
184 // Load an ELF file and prepare it for flashing
185 int flash_load(flash_file_t
*ctx
, const char *name
, int can_write_bl
)
189 Elf32_Phdr
*phdrs
= NULL
;
193 fd
= fopen(name
, "rb");
195 fprintf(stderr
, "Could not open file '%s': ", name
);
200 fprintf(stderr
, "Loading ELF file '%s'...\n", name
);
202 if (fread(&ehdr
, sizeof(ehdr
), 1, fd
) != 1) {
203 fprintf(stderr
, "Error while reading ELF file header\n");
206 if (memcmp(ehdr
.e_ident
, elf_ident
, sizeof(elf_ident
))
207 || le32(ehdr
.e_version
) != 1)
209 fprintf(stderr
, "Not an ELF file or wrong ELF type\n");
212 if (le16(ehdr
.e_type
) != ET_EXEC
) {
213 fprintf(stderr
, "ELF is not executable\n");
216 if (le16(ehdr
.e_machine
) != EM_ARM
) {
217 fprintf(stderr
, "Wrong ELF architecture\n");
220 if (!ehdr
.e_phnum
|| !ehdr
.e_phoff
) {
221 fprintf(stderr
, "ELF has no PHDRs\n");
224 if (le16(ehdr
.e_phentsize
) != sizeof(Elf32_Phdr
)) {
225 // could be a structure padding issue...
226 fprintf(stderr
, "Either the ELF file or this code is made of fail\n");
229 num_phdrs
= le16(ehdr
.e_phnum
);
231 phdrs
= malloc(le16(ehdr
.e_phnum
) * sizeof(Elf32_Phdr
));
233 fprintf(stderr
, "Out of memory\n");
236 if (fseek(fd
, le32(ehdr
.e_phoff
), SEEK_SET
) < 0) {
237 fprintf(stderr
, "Error while reading ELF PHDRs\n");
240 if (fread(phdrs
, sizeof(Elf32_Phdr
), num_phdrs
, fd
) != num_phdrs
) {
241 fprintf(stderr
, "Error while reading ELF PHDRs\n");
245 res
= build_segs_from_phdrs(ctx
, fd
, phdrs
, num_phdrs
);
248 res
= check_segs(ctx
, can_write_bl
);
254 ctx
->filename
= name
;
266 // Get the state of the proxmark, backwards compatible
267 static int get_proxmark_state(uint32_t *state
)
270 c
.cmd
= CMD_DEVICE_INFO
;
274 ReceiveCommand(&resp
);
277 // 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
278 // 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
279 // 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
283 *state
= DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM
;
285 case CMD_DEBUG_PRINT_STRING
:
286 *state
= DEVICE_INFO_FLAG_CURRENT_MODE_OS
;
288 case CMD_DEVICE_INFO
:
289 *state
= resp
.arg
[0];
292 fprintf(stderr
, "Error: Couldn't get proxmark state, bad response type: 0x%04x\n", resp
.cmd
);
300 // Enter the bootloader to be able to start flashing
301 static int enter_bootloader(void)
305 if (get_proxmark_state(&state
) < 0)
308 if (state
& DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM
) {
309 /* Already in flash state, we're done. */
313 if (state
& DEVICE_INFO_FLAG_CURRENT_MODE_OS
) {
314 fprintf(stderr
,"Entering bootloader...\n");
316 memset(&c
, 0, sizeof (c
));
318 if ((state
& DEVICE_INFO_FLAG_BOOTROM_PRESENT
)
319 && (state
& DEVICE_INFO_FLAG_OSIMAGE_PRESENT
))
321 // New style handover: Send CMD_START_FLASH, which will reset the board
322 // and enter the bootrom on the next boot.
323 c
.cmd
= CMD_START_FLASH
;
325 fprintf(stderr
,"(Press and release the button only to abort)\n");
327 // Old style handover: Ask the user to press the button, then reset the board
328 c
.cmd
= CMD_HARDWARE_RESET
;
330 fprintf(stderr
,"Press and hold down button NOW if your bootloader requires it.\n");
332 fprintf(stderr
,"Waiting for Proxmark to reappear on USB...");
336 while (!OpenProxmark(0)) {
338 fprintf(stderr
, ".");
340 fprintf(stderr
," Found.\n");
345 fprintf(stderr
, "Error: Unknown Proxmark mode\n");
349 static int wait_for_ack(void)
352 ReceiveCommand(&ack
);
353 if (ack
.cmd
!= CMD_ACK
) {
354 printf("Error: Unexpected reply 0x%04x (expected ACK)\n", ack
.cmd
);
360 // Go into flashing mode
361 int flash_start_flashing(int enable_bl_writes
)
365 if (enter_bootloader() < 0)
368 if (get_proxmark_state(&state
) < 0)
371 if (state
& DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH
) {
372 // This command is stupid. Why the heck does it care which area we're
373 // flashing, as long as it's not the bootloader area? The mind boggles.
374 UsbCommand c
= {CMD_START_FLASH
};
376 if (enable_bl_writes
) {
377 c
.arg
[0] = FLASH_START
;
378 c
.arg
[1] = FLASH_END
;
379 c
.arg
[2] = START_FLASH_MAGIC
;
381 c
.arg
[0] = BOOTLOADER_END
;
382 c
.arg
[1] = FLASH_END
;
386 return wait_for_ack();
388 fprintf(stderr
, "Note: Your bootloader does not understand the new START_FLASH command\n");
389 fprintf(stderr
, " It is recommended that you update your bootloader\n\n");
395 static int write_block(uint32_t address
, uint8_t *data
, uint32_t length
)
397 uint8_t block_buf
[BLOCK_SIZE
];
399 memset(block_buf
, 0xFF, BLOCK_SIZE
);
400 memcpy(block_buf
, data
, length
);
402 UsbCommand c
= {CMD_SETUP_WRITE
};
403 for (int i
= 0; i
< 240; i
+= 48) {
404 memcpy(c
.d
.asBytes
, block_buf
+ i
, 48);
407 if (wait_for_ack() < 0)
411 c
.cmd
= CMD_FINISH_WRITE
;
413 memcpy(c
.d
.asBytes
, block_buf
+240, 16);
415 return wait_for_ack();
418 // Write a file's segments to Flash
419 int flash_write(flash_file_t
*ctx
)
421 fprintf(stderr
, "Writing segments for file: %s\n", ctx
->filename
);
422 for (int i
= 0; i
< ctx
->num_segs
; i
++) {
423 flash_seg_t
*seg
= &ctx
->segments
[i
];
425 uint32_t length
= seg
->length
;
426 uint32_t blocks
= (length
+ BLOCK_SIZE
- 1) / BLOCK_SIZE
;
427 uint32_t end
= seg
->start
+ length
;
429 fprintf(stderr
, " 0x%08x..0x%08x [0x%x / %d blocks]",
430 seg
->start
, end
- 1, length
, blocks
);
433 uint8_t *data
= seg
->data
;
434 uint32_t baddr
= seg
->start
;
437 uint32_t block_size
= length
;
438 if (block_size
> BLOCK_SIZE
)
439 block_size
= BLOCK_SIZE
;
441 if (write_block(baddr
, data
, block_size
) < 0) {
442 fprintf(stderr
, " ERROR\n");
443 fprintf(stderr
, "Error writing block %d of %d\n", block
, blocks
);
449 length
-= block_size
;
451 fprintf(stderr
, ".");
453 fprintf(stderr
, " OK\n");
458 // free a file context
459 void flash_free(flash_file_t
*ctx
)
464 for (int i
= 0; i
< ctx
->num_segs
; i
++)
465 free(ctx
->segments
[i
].data
);
467 ctx
->segments
= NULL
;
472 // just reset the unit
473 int flash_stop_flashing(void) {
474 UsbCommand c
= {CMD_HARDWARE_RESET
};