[proxmark3-svn] / client / flash.c

//-----------------------------------------------------------------------------
// Copyright (C) 2010 Hector Martin "marcan" <marcan@marcansoft.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// ELF file flasher
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "proxmark3.h"
#include "sleep.h"
#include "flash.h"
#include "elf.h"
#include "proxendian.h"
#include "usb_cmd.h"

void SendCommand(UsbCommand* txcmd);
void ReceiveCommand(UsbCommand* rxcmd);
void CloseProxmark();
int OpenProxmark(size_t i);

// FIXME: what the fuckity fuck
unsigned int current_command = CMD_UNKNOWN;

#define FLASH_START            0x100000
#define FLASH_SIZE             (256*1024)
#define FLASH_END              (FLASH_START + FLASH_SIZE)
#define BOOTLOADER_SIZE        0x2000
#define BOOTLOADER_END         (FLASH_START + BOOTLOADER_SIZE)

#define BLOCK_SIZE             0x200

static const uint8_t elf_ident[] = {
	0x7f, 'E', 'L', 'F',
	ELFCLASS32,
	ELFDATA2LSB,
	EV_CURRENT
};

// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
// unaligned segments if needed
static int build_segs_from_phdrs(flash_file_t *ctx, FILE *fd, Elf32_Phdr *phdrs, int num_phdrs)
{
	Elf32_Phdr *phdr = phdrs;
	flash_seg_t *seg;
	uint32_t last_end = 0;

	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	if (!ctx->segments) {
		fprintf(stderr, "Out of memory\n");
		return -1;
	}
	ctx->num_segs = 0;
	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) {
			phdr++;
			continue;
		}
		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);
		if (!filesz) {
			phdr++;
			continue;
		}
		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' : ' ',
		        offset);
		if (filesz != memsz) {
			fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
			                "(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
			return -1;
		}
		if (paddr < last_end) {
			fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
			return -1;
		}
		if (paddr < FLASH_START || (paddr+filesz) > FLASH_END) {
			fprintf(stderr, "Error: PHDR is not contained in Flash\n");
			return -1;
		}
		if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
			fprintf(stderr, "Error: Flash VMA segment is writable\n");
			return -1;
		}

		uint8_t *data;
		// make extra space if we need to move the data forward
		data = malloc(filesz + BLOCK_SIZE);
		if (!data) {
			fprintf(stderr, "Out of memory\n");
			return -1;
		}
		if (fseek(fd, offset, SEEK_SET) < 0 || fread(data, 1, filesz, fd) != filesz) {
			fprintf(stderr, "Error while reading PHDR payload\n");
			free(data);
			return -1;
		}

		uint32_t block_offset = paddr & (BLOCK_SIZE-1);
		if (block_offset) {
			if (ctx->num_segs) {
				flash_seg_t *prev_seg = seg - 1;
				uint32_t this_end = paddr + filesz;
				uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
				uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);

				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);
					if (!new_data) {
						fprintf(stderr, "Out of memory\n");
						free(data);
						return -1;
					}
					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",
					        prev_seg->length, new_length);
					if (hole)
						fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
					free(data);
					free(prev_seg->data);
					prev_seg->data = new_data;
					prev_seg->length = new_length;
					last_end = this_end;
					phdr++;
					continue;
				}
			}
			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);
			filesz += block_offset;
			paddr -= block_offset;
		}

		seg->data = data;
		seg->start = paddr;
		seg->length = filesz;
		seg++;
		ctx->num_segs++;

		last_end = paddr + filesz;
		phdr++;
	}
	return 0;
}

// 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];

		if (seg->start & (BLOCK_SIZE-1)) {
			fprintf(stderr, "Error: Segment is not aligned\n");
			return -1;
		}
		if (seg->start < FLASH_START) {
			fprintf(stderr, "Error: Segment is outside of flash bounds\n");
			return -1;
		}
		if (seg->start + seg->length > FLASH_END) {
			fprintf(stderr, "Error: Segment is outside of flash bounds\n");
			return -1;
		}
		if (!can_write_bl && seg->start < BOOTLOADER_END) {
			fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
			return -1;
		}
	}
	return 0;
}

// Load an ELF file and prepare it for flashing
int flash_load(flash_file_t *ctx, const char *name, int can_write_bl)
{
	FILE *fd = NULL;
	Elf32_Ehdr ehdr;
	Elf32_Phdr *phdrs = NULL;
	int num_phdrs;
	int res;

	fd = fopen(name, "rb");
	if (!fd) {
		fprintf(stderr, "Could not open file '%s': ", name);
		perror(NULL);
		goto fail;
	}

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

	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
		fprintf(stderr, "Error while reading ELF file header\n");
		goto fail;
	}
	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
		|| le32(ehdr.e_version) != 1)
	{
		fprintf(stderr, "Not an ELF file or wrong ELF type\n");
		goto fail;
	}
	if (le16(ehdr.e_type) != ET_EXEC) {
		fprintf(stderr, "ELF is not executable\n");
		goto fail;
	}
	if (le16(ehdr.e_machine) != EM_ARM) {
		fprintf(stderr, "Wrong ELF architecture\n");
		goto fail;
	}
	if (!ehdr.e_phnum || !ehdr.e_phoff) {
		fprintf(stderr, "ELF has no PHDRs\n");
		goto fail;
	}
	if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
		// could be a structure padding issue...
		fprintf(stderr, "Either the ELF file or this code is made of fail\n");
		goto fail;
	}
	num_phdrs = le16(ehdr.e_phnum);

	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
	if (!phdrs) {
		fprintf(stderr, "Out of memory\n");
		goto fail;
	}
	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
		fprintf(stderr, "Error while reading ELF PHDRs\n");
		goto fail;
	}
	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
		fprintf(stderr, "Error while reading ELF PHDRs\n");
		goto fail;
	}

	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
	if (res < 0)
		goto fail;
	res = check_segs(ctx, can_write_bl);
	if (res < 0)
		goto fail;

	free(phdrs);
	fclose(fd);
	ctx->filename = name;
	return 0;

fail:
	if (phdrs)
		free(phdrs);
	if (fd)
		fclose(fd);
	flash_free(ctx);
	return -1;
}

// Get the state of the proxmark, backwards compatible
static int get_proxmark_state(uint32_t *state)
{
	UsbCommand c;
	c.cmd = CMD_DEVICE_INFO;
  SendCommand(&c);
	UsbCommand resp;
	ReceiveCommand(&resp);

	// Three outcomes:
	// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
	// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
	// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags

	switch (resp.cmd) {
		case CMD_ACK:
			*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
			break;
		case CMD_DEBUG_PRINT_STRING:
			*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
			break;
		case CMD_DEVICE_INFO:
			*state = resp.arg[0];
			break;
		default:
			fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04"llx"\n", resp.cmd);
			return -1;
			break;
	}

	return 0;
}

// Enter the bootloader to be able to start flashing
static int enter_bootloader(char *serial_port_name)
{
	uint32_t state;

	if (get_proxmark_state(&state) < 0)
		return -1;

	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
		/* Already in flash state, we're done. */
		return 0;
	}

	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
		fprintf(stderr,"Entering bootloader...\n");
		UsbCommand c;
		memset(&c, 0, sizeof (c));

		if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
			&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
		{
			// New style handover: Send CMD_START_FLASH, which will reset the board
			// and enter the bootrom on the next boot.
			c.cmd = CMD_START_FLASH;
			SendCommand(&c);
			fprintf(stderr,"(Press and release the button only to abort)\n");
		} else {
			// Old style handover: Ask the user to press the button, then reset the board
			c.cmd = CMD_HARDWARE_RESET;
			SendCommand(&c);
			fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
		}
    msleep(100);
		CloseProxmark();

		fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
    do {
			sleep(1);
			fprintf(stderr, ".");
		} while (!OpenProxmark(0));
		fprintf(stderr," Found.\n");

		return 0;
	}

	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	return -1;
}

static int wait_for_ack(void)
{
  UsbCommand ack;
	ReceiveCommand(&ack);
	if (ack.cmd != CMD_ACK) {
		printf("Error: Unexpected reply 0x%04"llx" (expected ACK)\n", ack.cmd);
		return -1;
	}
	return 0;
}

// Go into flashing mode
int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
{
	uint32_t state;

	if (enter_bootloader(serial_port_name) < 0)
		return -1;

	if (get_proxmark_state(&state) < 0)
		return -1;

	if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
		// This command is stupid. Why the heck does it care which area we're
		// flashing, as long as it's not the bootloader area? The mind boggles.
		UsbCommand c = {CMD_START_FLASH};

		if (enable_bl_writes) {
			c.arg[0] = FLASH_START;
			c.arg[1] = FLASH_END;
			c.arg[2] = START_FLASH_MAGIC;
		} else {
			c.arg[0] = BOOTLOADER_END;
			c.arg[1] = FLASH_END;
			c.arg[2] = 0;
		}
		SendCommand(&c);
		return wait_for_ack();
	} 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");
	}

	return 0;
}

static int write_block(uint32_t address, uint8_t *data, uint32_t length)
{
	uint8_t block_buf[BLOCK_SIZE];

	memset(block_buf, 0xFF, BLOCK_SIZE);
	memcpy(block_buf, data, length);
  UsbCommand c;
	c.cmd = CMD_FINISH_WRITE;
	c.arg[0] = address;
	memcpy(c.d.asBytes, block_buf, length);
  SendCommand(&c);
  return wait_for_ack();
}

// Write a file's segments to Flash
int flash_write(flash_file_t *ctx)
{
	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];

		uint32_t length = seg->length;
		uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
		uint32_t end = seg->start + length;

		fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
		        seg->start, end - 1, length, blocks);

		int block = 0;
		uint8_t *data = seg->data;
		uint32_t baddr = seg->start;

		while (length) {
			uint32_t block_size = length;
			if (block_size > BLOCK_SIZE)
				block_size = BLOCK_SIZE;

			if (write_block(baddr, data, block_size) < 0) {
				fprintf(stderr, " ERROR\n");
				fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
				return -1;
			}

			data += block_size;
			baddr += block_size;
			length -= block_size;
			block++;
			fprintf(stderr, ".");
		}
		fprintf(stderr, " OK\n");
	}
	return 0;
}

// free a file context
void flash_free(flash_file_t *ctx)
{
	if (!ctx)
		return;
	if (ctx->segments) {
		for (int i = 0; i < ctx->num_segs; i++)
			free(ctx->segments[i].data);
		free(ctx->segments);
		ctx->segments = NULL;
		ctx->num_segs = 0;
	}
}

// just reset the unit
int flash_stop_flashing(void) {
	UsbCommand c = {CMD_HARDWARE_RESET};
  SendCommand(&c);
  msleep(100);
  return 0;
}
Commit	Line	Data
a553f267	1	//-----------------------------------------------------------------------------
8fe1a992	2	// Copyright (C) 2010 Hector Martin "marcan" <marcan@marcansoft.com>
8fe1a992	3	//
a553f267	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	//-----------------------------------------------------------------------------
8fe1a992	8	// ELF file flasher
a553f267	9	//-----------------------------------------------------------------------------
a553f267	10
6e4d4ee6	11	#include <stdio.h>
6e4d4ee6	12	#include <string.h>
83a9b236	13	#include <stdlib.h>
125a98a1	14	#include "proxmark3.h"
4cd41f34	15	#include "sleep.h"
6e4d4ee6	16	#include "flash.h"
2cab856f	17	#include "elf.h"
8fe1a992	18	#include "proxendian.h"
28fdb04f	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);
6e4d4ee6	25
0ae6234a	26	// FIXME: what the fuckity fuck
8fe1a992	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
28fdb04f	35	#define BLOCK_SIZE 0x200
8fe1a992	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)
7fe9b0b7	47	{
8fe1a992	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;
6e4d4ee6	164	}
6e4d4ee6	165
8fe1a992	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
66d6ba70	259	free(phdrs);
8fe1a992	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	}
6e4d4ee6	272
8fe1a992	273	// Get the state of the proxmark, backwards compatible
8fe1a992	274	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	275	{
28fdb04f	276	UsbCommand c;
8fe1a992	277	c.cmd = CMD_DEVICE_INFO;
28fdb04f	278	SendCommand(&c);
28fdb04f	279	UsbCommand resp;
8fe1a992	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:
125a98a1	298	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04"llx"\n", resp.cmd);
8fe1a992	299	return -1;
	300	break;
	301	}
	302
	303	return 0;
6e4d4ee6	304	}
6e4d4ee6	305
8fe1a992	306	// Enter the bootloader to be able to start flashing
e12b82d3	307	static int enter_bootloader(char *serial_port_name)
6e4d4ee6	308	{
8fe1a992	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");
28fdb04f	321	UsbCommand c;
8fe1a992	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;
28fdb04f	330	SendCommand(&c);
8fe1a992	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;
28fdb04f	335	SendCommand(&c);
8fe1a992	336	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
8fe1a992	337	}
d8193fa5	338	msleep(100);
8fe1a992	339	CloseProxmark();
d8193fa5	340
e654346b	341	fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
d8193fa5	342	do {
8fe1a992	343	sleep(1);
8fe1a992	344	fprintf(stderr, ".");
d8193fa5	345	} while (!OpenProxmark(0));
8fe1a992	346	fprintf(stderr," Found.\n");
	347
	348	return 0;
	349	}
	350
	351	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	352	return -1;
6e4d4ee6	353	}
6e4d4ee6	354
8fe1a992	355	static int wait_for_ack(void)
6e4d4ee6	356	{
28fdb04f	357	UsbCommand ack;
8fe1a992	358	ReceiveCommand(&ack);
8fe1a992	359	if (ack.cmd != CMD_ACK) {
125a98a1	360	printf("Error: Unexpected reply 0x%04"llx" (expected ACK)\n", ack.cmd);
8fe1a992	361	return -1;
	362	}
	363	return 0;
6e4d4ee6	364	}
6e4d4ee6	365
8fe1a992	366	// Go into flashing mode
e12b82d3	367	int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
6e4d4ee6	368	{
8fe1a992	369	uint32_t state;
8fe1a992	370
e12b82d3	371	if (enter_bootloader(serial_port_name) < 0)
8fe1a992	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.
28fdb04f	380	UsbCommand c = {CMD_START_FLASH};
8fe1a992	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	}
28fdb04f	391	SendCommand(&c);
8fe1a992	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;
6e4d4ee6	399	}
6e4d4ee6	400
8fe1a992	401	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
6e4d4ee6	402	{
8fe1a992	403	uint8_t block_buf[BLOCK_SIZE];
	404
	405	memset(block_buf, 0xFF, BLOCK_SIZE);
	406	memcpy(block_buf, data, length);
28fdb04f	407	UsbCommand c;
8fe1a992	408	c.cmd = CMD_FINISH_WRITE;
8fe1a992	409	c.arg[0] = address;
28fdb04f	410	memcpy(c.d.asBytes, block_buf, length);
	411	SendCommand(&c);
	412	return wait_for_ack();
6e4d4ee6	413	}
6e4d4ee6	414
8fe1a992	415	// Write a file's segments to Flash
8fe1a992	416	int flash_write(flash_file_t *ctx)
6e4d4ee6	417	{
8fe1a992	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;
6e4d4ee6	453	}
6e4d4ee6	454
8fe1a992	455	// free a file context
8fe1a992	456	void flash_free(flash_file_t *ctx)
7fe9b0b7	457	{
8fe1a992	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) {
28fdb04f	471	UsbCommand c = {CMD_HARDWARE_RESET};
28fdb04f	472	SendCommand(&c);
d8193fa5	473	msleep(100);
28fdb04f	474	return 0;
6e4d4ee6	475	}