[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;

	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
253	fclose(fd);
254	ctx->filename = name;
255	return 0;
256
257	fail:
258	if (phdrs)
259	free(phdrs);
260	if (fd)
261	fclose(fd);
262	flash_free(ctx);
263	return -1;
264	}
6e4d4ee6	265
8fe1a992	266	// Get the state of the proxmark, backwards compatible
8fe1a992	267	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	268	{
8fe1a992	269	UsbCommand c;
	270	c.cmd = CMD_DEVICE_INFO;
	271	SendCommand(&c);
	272
	273	UsbCommand resp;
	274	ReceiveCommand(&resp);
	275
	276	// Three outcomes:
	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
	280
	281	switch (resp.cmd) {
	282	case CMD_ACK:
	283	*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
	284	break;
	285	case CMD_DEBUG_PRINT_STRING:
	286	*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
	287	break;
	288	case CMD_DEVICE_INFO:
	289	*state = resp.arg[0];
	290	break;
	291	default:
	292	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04x\n", resp.cmd);
	293	return -1;
	294	break;
	295	}
	296
	297	return 0;
6e4d4ee6	298	}
6e4d4ee6	299
8fe1a992	300	// Enter the bootloader to be able to start flashing
8fe1a992	301	static int enter_bootloader(void)
6e4d4ee6	302	{
8fe1a992	303	uint32_t state;
	304
	305	if (get_proxmark_state(&state) < 0)
	306	return -1;
	307
	308	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
	309	/* Already in flash state, we're done. */
	310	return 0;
	311	}
	312
	313	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
	314	fprintf(stderr,"Entering bootloader...\n");
	315	UsbCommand c;
	316	memset(&c, 0, sizeof (c));
	317
	318	if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
	319	&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
	320	{
	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;
	324	SendCommand(&c);
	325	fprintf(stderr,"(Press and release the button only to abort)\n");
	326	} else {
	327	// Old style handover: Ask the user to press the button, then reset the board
	328	c.cmd = CMD_HARDWARE_RESET;
	329	SendCommand(&c);
	330	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
	331	}
	332	fprintf(stderr,"Waiting for Proxmark to reappear on USB...");
	333
	334	CloseProxmark();
	335	sleep(1);
	336	while (!OpenProxmark(0)) {
	337	sleep(1);
	338	fprintf(stderr, ".");
	339	}
	340	fprintf(stderr," Found.\n");
	341
	342	return 0;
	343	}
	344
	345	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	346	return -1;
6e4d4ee6	347	}
6e4d4ee6	348
8fe1a992	349	static int wait_for_ack(void)
6e4d4ee6	350	{
8fe1a992	351	UsbCommand ack;
	352	ReceiveCommand(&ack);
	353	if (ack.cmd != CMD_ACK) {
	354	printf("Error: Unexpected reply 0x%04x (expected ACK)\n", ack.cmd);
	355	return -1;
	356	}
	357	return 0;
6e4d4ee6	358	}
6e4d4ee6	359
8fe1a992	360	// Go into flashing mode
8fe1a992	361	int flash_start_flashing(int enable_bl_writes)
6e4d4ee6	362	{
8fe1a992	363	uint32_t state;
	364
	365	if (enter_bootloader() < 0)
	366	return -1;
	367
	368	if (get_proxmark_state(&state) < 0)
	369	return -1;
	370
	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};
	375
	376	if (enable_bl_writes) {
	377	c.arg[0] = FLASH_START;
	378	c.arg[1] = FLASH_END;
	379	c.arg[2] = START_FLASH_MAGIC;
	380	} else {
	381	c.arg[0] = BOOTLOADER_END;
	382	c.arg[1] = FLASH_END;
	383	c.arg[2] = 0;
	384	}
	385	SendCommand(&c);
	386	return wait_for_ack();
	387	} else {
	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");
	390	}
	391
	392	return 0;
6e4d4ee6	393	}
6e4d4ee6	394
8fe1a992	395	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
6e4d4ee6	396	{
8fe1a992	397	uint8_t block_buf[BLOCK_SIZE];
	398
	399	memset(block_buf, 0xFF, BLOCK_SIZE);
	400	memcpy(block_buf, data, length);
	401
	402	UsbCommand c = {CMD_SETUP_WRITE};
	403	for (int i = 0; i < 240; i += 48) {
	404	memcpy(c.d.asBytes, block_buf + i, 48);
	405	c.arg[0] = i / 4;
	406	SendCommand(&c);
	407	if (wait_for_ack() < 0)
	408	return -1;
	409	}
	410
	411	c.cmd = CMD_FINISH_WRITE;
	412	c.arg[0] = address;
	413	memcpy(c.d.asBytes, block_buf+240, 16);
	414	SendCommand(&c);
	415	return wait_for_ack();
6e4d4ee6	416	}
6e4d4ee6	417
8fe1a992	418	// Write a file's segments to Flash
8fe1a992	419	int flash_write(flash_file_t *ctx)
6e4d4ee6	420	{
8fe1a992	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];
	424
	425	uint32_t length = seg->length;
	426	uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
	427	uint32_t end = seg->start + length;
	428
	429	fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
	430	seg->start, end - 1, length, blocks);
	431
	432	int block = 0;
	433	uint8_t *data = seg->data;
	434	uint32_t baddr = seg->start;
	435
	436	while (length) {
	437	uint32_t block_size = length;
	438	if (block_size > BLOCK_SIZE)
	439	block_size = BLOCK_SIZE;
	440
	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);
	444	return -1;
	445	}
	446
	447	data += block_size;
	448	baddr += block_size;
	449	length -= block_size;
	450	block++;
	451	fprintf(stderr, ".");
	452	}
	453	fprintf(stderr, " OK\n");
	454	}
	455	return 0;
6e4d4ee6	456	}
6e4d4ee6	457
8fe1a992	458	// free a file context
8fe1a992	459	void flash_free(flash_file_t *ctx)
7fe9b0b7	460	{
8fe1a992	461	if (!ctx)
	462	return;
	463	if (ctx->segments) {
	464	for (int i = 0; i < ctx->num_segs; i++)
	465	free(ctx->segments[i].data);
	466	free(ctx->segments);
	467	ctx->segments = NULL;
	468	ctx->num_segs = 0;
	469	}
	470	}
	471
	472	// just reset the unit
	473	int flash_stop_flashing(void) {
	474	UsbCommand c = {CMD_HARDWARE_RESET};
	475	SendCommand(&c);
	476	return 0;
6e4d4ee6	477	}