[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 "sleep.h"
#include "proxusb.h"
#include "flash.h"
#include "elf.h"
#include "proxendian.h"

// 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             0x100

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%04x\n", resp.cmd);
			return -1;
			break;
	}

	return 0;
}

// Enter the bootloader to be able to start flashing
static int enter_bootloader(void)
{
	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");
		}
		fprintf(stderr,"Waiting for Proxmark to reappear on USB...");

		CloseProxmark();
		sleep(1);
		while (!OpenProxmark(0)) {
			sleep(1);
			fprintf(stderr, ".");
		}
		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%04x (expected ACK)\n", ack.cmd);
		return -1;
	}
	return 0;
}

// Go into flashing mode
int flash_start_flashing(int enable_bl_writes)
{
	uint32_t state;

	if (enter_bootloader() < 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 = {CMD_SETUP_WRITE};
	for (int i = 0; i < 240; i += 48) {
		memcpy(c.d.asBytes, block_buf + i, 48);
		c.arg[0] = i / 4;
		SendCommand(&c);
		if (wait_for_ack() < 0)
			return -1;
	}

	c.cmd = CMD_FINISH_WRITE;
	c.arg[0] = address;
	memcpy(c.d.asBytes, block_buf+240, 16);
	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);
	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>
4cd41f34	14	#include "sleep.h"
4cd41f34	15	#include "proxusb.h"
6e4d4ee6	16	#include "flash.h"
2cab856f	17	#include "elf.h"
8fe1a992	18	#include "proxendian.h"
6e4d4ee6	19
0ae6234a	20	// FIXME: what the fuckity fuck
8fe1a992	21	unsigned int current_command = CMD_UNKNOWN;
	22
	23	#define FLASH_START 0x100000
	24	#define FLASH_SIZE (256*1024)
	25	#define FLASH_END (FLASH_START + FLASH_SIZE)
	26	#define BOOTLOADER_SIZE 0x2000
	27	#define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
	28
	29	#define BLOCK_SIZE 0x100
	30
	31	static const uint8_t elf_ident[] = {
	32	0x7f, 'E', 'L', 'F',
	33	ELFCLASS32,
	34	ELFDATA2LSB,
	35	EV_CURRENT
	36	};
	37
	38	// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
	39	// unaligned segments if needed
	40	static int build_segs_from_phdrs(flash_file_t ctx, FILE fd, Elf32_Phdr *phdrs, int num_phdrs)
7fe9b0b7	41	{
8fe1a992	42	Elf32_Phdr *phdr = phdrs;
	43	flash_seg_t *seg;
	44	uint32_t last_end = 0;
	45
	46	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	47	if (!ctx->segments) {
	48	fprintf(stderr, "Out of memory\n");
	49	return -1;
	50	}
	51	ctx->num_segs = 0;
	52	seg = ctx->segments;
	53
	54	fprintf(stderr, "Loading usable ELF segments:\n");
	55	for (int i = 0; i < num_phdrs; i++) {
	56	if (le32(phdr->p_type) != PT_LOAD) {
	57	phdr++;
	58	continue;
	59	}
	60	uint32_t vaddr = le32(phdr->p_vaddr);
	61	uint32_t paddr = le32(phdr->p_paddr);
	62	uint32_t filesz = le32(phdr->p_filesz);
	63	uint32_t memsz = le32(phdr->p_memsz);
	64	uint32_t offset = le32(phdr->p_offset);
	65	uint32_t flags = le32(phdr->p_flags);
	66	if (!filesz) {
	67	phdr++;
	68	continue;
	69	}
	70	fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
	71	i, vaddr, paddr, filesz, memsz,
	72	flags & PF_R ? 'R' : ' ',
	73	flags & PF_W ? 'W' : ' ',
	74	flags & PF_X ? 'X' : ' ',
	75	offset);
	76	if (filesz != memsz) {
	77	fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
	78	"(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
	79	return -1;
	80	}
	81	if (paddr < last_end) {
	82	fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
	83	return -1;
	84	}
	85	if (paddr < FLASH_START \|\| (paddr+filesz) > FLASH_END) {
	86	fprintf(stderr, "Error: PHDR is not contained in Flash\n");
	87	return -1;
	88	}
	89	if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
	90	fprintf(stderr, "Error: Flash VMA segment is writable\n");
	91	return -1;
	92	}
	93
	94	uint8_t *data;
	95	// make extra space if we need to move the data forward
	96	data = malloc(filesz + BLOCK_SIZE);
	97	if (!data) {
	98	fprintf(stderr, "Out of memory\n");
	99	return -1;
	100	}
	101	if (fseek(fd, offset, SEEK_SET) < 0 \|\| fread(data, 1, filesz, fd) != filesz) {
	102	fprintf(stderr, "Error while reading PHDR payload\n");
	103	free(data);
	104	return -1;
	105	}
106
107	uint32_t block_offset = paddr & (BLOCK_SIZE-1);
108	if (block_offset) {
109	if (ctx->num_segs) {
110	flash_seg_t *prev_seg = seg - 1;
111	uint32_t this_end = paddr + filesz;
112	uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
113	uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
114
115	if (this_firstblock == prev_lastblock) {
116	uint32_t new_length = this_end - prev_seg->start;
117	uint32_t this_offset = paddr - prev_seg->start;
118	uint32_t hole = this_offset - prev_seg->length;
119	uint8_t *new_data = malloc(new_length);
120	if (!new_data) {
121	fprintf(stderr, "Out of memory\n");
122	free(data);
123	return -1;
124	}
125	memset(new_data, 0xff, new_length);
126	memcpy(new_data, prev_seg->data, prev_seg->length);
127	memcpy(new_data + this_offset, data, filesz);
128	fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
129	prev_seg->length, new_length);
130	if (hole)
131	fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
132	free(data);
133	free(prev_seg->data);
134	prev_seg->data = new_data;
135	prev_seg->length = new_length;
136	last_end = this_end;
137	phdr++;
138	continue;
139	}
140	}
141	fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
142	memmove(data + block_offset, data, filesz);
143	memset(data, 0xFF, block_offset);
144	filesz += block_offset;
145	paddr -= block_offset;
146	}
147
148	seg->data = data;
149	seg->start = paddr;
150	seg->length = filesz;
151	seg++;
152	ctx->num_segs++;
153
154	last_end = paddr + filesz;
155	phdr++;
156	}
157	return 0;
6e4d4ee6	158	}
6e4d4ee6	159
8fe1a992	160	// Sanity check segments and check for bootloader writes
	161	static int check_segs(flash_file_t *ctx, int can_write_bl) {
	162	for (int i = 0; i < ctx->num_segs; i++) {
	163	flash_seg_t *seg = &ctx->segments[i];
	164
	165	if (seg->start & (BLOCK_SIZE-1)) {
	166	fprintf(stderr, "Error: Segment is not aligned\n");
	167	return -1;
	168	}
	169	if (seg->start < FLASH_START) {
	170	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	171	return -1;
	172	}
	173	if (seg->start + seg->length > FLASH_END) {
	174	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	175	return -1;
	176	}
	177	if (!can_write_bl && seg->start < BOOTLOADER_END) {
	178	fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
	179	return -1;
	180	}
	181	}
	182	return 0;
	183	}
	184
	185	// Load an ELF file and prepare it for flashing
	186	int flash_load(flash_file_t ctx, const char name, int can_write_bl)
	187	{
	188	FILE *fd = NULL;
	189	Elf32_Ehdr ehdr;
	190	Elf32_Phdr *phdrs = NULL;
	191	int num_phdrs;
	192	int res;
	193
	194	fd = fopen(name, "rb");
	195	if (!fd) {
	196	fprintf(stderr, "Could not open file '%s': ", name);
	197	perror(NULL);
	198	goto fail;
	199	}
	200
	201	fprintf(stderr, "Loading ELF file '%s'...\n", name);
	202
	203	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
	204	fprintf(stderr, "Error while reading ELF file header\n");
	205	goto fail;
	206	}
	207	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
	208	\|\| le32(ehdr.e_version) != 1)
	209	{
	210	fprintf(stderr, "Not an ELF file or wrong ELF type\n");
	211	goto fail;
	212	}
	213	if (le16(ehdr.e_type) != ET_EXEC) {
	214	fprintf(stderr, "ELF is not executable\n");
	215	goto fail;
	216	}
	217	if (le16(ehdr.e_machine) != EM_ARM) {
	218	fprintf(stderr, "Wrong ELF architecture\n");
	219	goto fail;
	220	}
	221	if (!ehdr.e_phnum \|\| !ehdr.e_phoff) {
	222	fprintf(stderr, "ELF has no PHDRs\n");
	223	goto fail;
224	}
225	if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
226	// could be a structure padding issue...
227	fprintf(stderr, "Either the ELF file or this code is made of fail\n");
228	goto fail;
229	}
230	num_phdrs = le16(ehdr.e_phnum);
231
232	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
233	if (!phdrs) {
234	fprintf(stderr, "Out of memory\n");
235	goto fail;
236	}
237	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
238	fprintf(stderr, "Error while reading ELF PHDRs\n");
239	goto fail;
240	}
241	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
242	fprintf(stderr, "Error while reading ELF PHDRs\n");
243	goto fail;
244	}
245
246	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
247	if (res < 0)
248	goto fail;
249	res = check_segs(ctx, can_write_bl);
250	if (res < 0)
251	goto fail;
252
66d6ba70	253	free(phdrs);
8fe1a992	254	fclose(fd);
	255	ctx->filename = name;
	256	return 0;
	257
	258	fail:
	259	if (phdrs)
	260	free(phdrs);
	261	if (fd)
	262	fclose(fd);
	263	flash_free(ctx);
	264	return -1;
	265	}
6e4d4ee6	266
8fe1a992	267	// Get the state of the proxmark, backwards compatible
8fe1a992	268	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	269	{
8fe1a992	270	UsbCommand c;
	271	c.cmd = CMD_DEVICE_INFO;
	272	SendCommand(&c);
	273
	274	UsbCommand resp;
	275	ReceiveCommand(&resp);
	276
	277	// Three outcomes:
	278	// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
	279	// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
	280	// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
	281
	282	switch (resp.cmd) {
	283	case CMD_ACK:
	284	*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
	285	break;
	286	case CMD_DEBUG_PRINT_STRING:
	287	*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
	288	break;
	289	case CMD_DEVICE_INFO:
	290	*state = resp.arg[0];
	291	break;
	292	default:
	293	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04x\n", resp.cmd);
	294	return -1;
	295	break;
	296	}
	297
	298	return 0;
6e4d4ee6	299	}
6e4d4ee6	300
8fe1a992	301	// Enter the bootloader to be able to start flashing
8fe1a992	302	static int enter_bootloader(void)
6e4d4ee6	303	{
8fe1a992	304	uint32_t state;
	305
	306	if (get_proxmark_state(&state) < 0)
	307	return -1;
	308
	309	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
	310	/* Already in flash state, we're done. */
	311	return 0;
	312	}
	313
	314	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
	315	fprintf(stderr,"Entering bootloader...\n");
	316	UsbCommand c;
	317	memset(&c, 0, sizeof (c));
	318
	319	if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
	320	&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
	321	{
	322	// New style handover: Send CMD_START_FLASH, which will reset the board
	323	// and enter the bootrom on the next boot.
	324	c.cmd = CMD_START_FLASH;
	325	SendCommand(&c);
	326	fprintf(stderr,"(Press and release the button only to abort)\n");
	327	} else {
	328	// Old style handover: Ask the user to press the button, then reset the board
	329	c.cmd = CMD_HARDWARE_RESET;
	330	SendCommand(&c);
	331	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
	332	}
	333	fprintf(stderr,"Waiting for Proxmark to reappear on USB...");
	334
	335	CloseProxmark();
	336	sleep(1);
	337	while (!OpenProxmark(0)) {
	338	sleep(1);
	339	fprintf(stderr, ".");
	340	}
	341	fprintf(stderr," Found.\n");
	342
	343	return 0;
	344	}
	345
	346	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	347	return -1;
6e4d4ee6	348	}
6e4d4ee6	349
8fe1a992	350	static int wait_for_ack(void)
6e4d4ee6	351	{
8fe1a992	352	UsbCommand ack;
	353	ReceiveCommand(&ack);
	354	if (ack.cmd != CMD_ACK) {
	355	printf("Error: Unexpected reply 0x%04x (expected ACK)\n", ack.cmd);
	356	return -1;
	357	}
	358	return 0;
6e4d4ee6	359	}
6e4d4ee6	360
8fe1a992	361	// Go into flashing mode
8fe1a992	362	int flash_start_flashing(int enable_bl_writes)
6e4d4ee6	363	{
8fe1a992	364	uint32_t state;
	365
	366	if (enter_bootloader() < 0)
	367	return -1;
	368
	369	if (get_proxmark_state(&state) < 0)
	370	return -1;
	371
	372	if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
	373	// This command is stupid. Why the heck does it care which area we're
	374	// flashing, as long as it's not the bootloader area? The mind boggles.
	375	UsbCommand c = {CMD_START_FLASH};
	376
	377	if (enable_bl_writes) {
	378	c.arg[0] = FLASH_START;
	379	c.arg[1] = FLASH_END;
	380	c.arg[2] = START_FLASH_MAGIC;
	381	} else {
	382	c.arg[0] = BOOTLOADER_END;
	383	c.arg[1] = FLASH_END;
	384	c.arg[2] = 0;
	385	}
	386	SendCommand(&c);
	387	return wait_for_ack();
	388	} else {
	389	fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
	390	fprintf(stderr, " It is recommended that you update your bootloader\n\n");
	391	}
	392
	393	return 0;
6e4d4ee6	394	}
6e4d4ee6	395
8fe1a992	396	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
6e4d4ee6	397	{
8fe1a992	398	uint8_t block_buf[BLOCK_SIZE];
	399
	400	memset(block_buf, 0xFF, BLOCK_SIZE);
	401	memcpy(block_buf, data, length);
	402
	403	UsbCommand c = {CMD_SETUP_WRITE};
	404	for (int i = 0; i < 240; i += 48) {
	405	memcpy(c.d.asBytes, block_buf + i, 48);
	406	c.arg[0] = i / 4;
	407	SendCommand(&c);
	408	if (wait_for_ack() < 0)
	409	return -1;
	410	}
	411
	412	c.cmd = CMD_FINISH_WRITE;
	413	c.arg[0] = address;
	414	memcpy(c.d.asBytes, block_buf+240, 16);
	415	SendCommand(&c);
	416	return wait_for_ack();
6e4d4ee6	417	}
6e4d4ee6	418
8fe1a992	419	// Write a file's segments to Flash
8fe1a992	420	int flash_write(flash_file_t *ctx)
6e4d4ee6	421	{
8fe1a992	422	fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
	423	for (int i = 0; i < ctx->num_segs; i++) {
	424	flash_seg_t *seg = &ctx->segments[i];
	425
	426	uint32_t length = seg->length;
	427	uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
	428	uint32_t end = seg->start + length;
	429
	430	fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
	431	seg->start, end - 1, length, blocks);
	432
	433	int block = 0;
	434	uint8_t *data = seg->data;
	435	uint32_t baddr = seg->start;
	436
	437	while (length) {
	438	uint32_t block_size = length;
	439	if (block_size > BLOCK_SIZE)
	440	block_size = BLOCK_SIZE;
	441
	442	if (write_block(baddr, data, block_size) < 0) {
	443	fprintf(stderr, " ERROR\n");
	444	fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
	445	return -1;
	446	}
	447
	448	data += block_size;
	449	baddr += block_size;
	450	length -= block_size;
	451	block++;
	452	fprintf(stderr, ".");
	453	}
	454	fprintf(stderr, " OK\n");
	455	}
	456	return 0;
6e4d4ee6	457	}
6e4d4ee6	458
8fe1a992	459	// free a file context
8fe1a992	460	void flash_free(flash_file_t *ctx)
7fe9b0b7	461	{
8fe1a992	462	if (!ctx)
	463	return;
	464	if (ctx->segments) {
	465	for (int i = 0; i < ctx->num_segs; i++)
	466	free(ctx->segments[i].data);
	467	free(ctx->segments);
	468	ctx->segments = NULL;
	469	ctx->num_segs = 0;
	470	}
	471	}
	472
	473	// just reset the unit
	474	int flash_stop_flashing(void) {
	475	UsbCommand c = {CMD_HARDWARE_RESET};
	476	SendCommand(&c);
	477	return 0;
6e4d4ee6	478	}