[proxmark3-svn] / client / hid-flasher / 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 "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
e9281ae8 JH	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>
e9281ae8 JH	14	#include "proxusb.h"
	15	#include "flash.h"
	16	#include "elf.h"
	17	#include "proxendian.h"
	18
	19	// FIXME: what the fuckity fuck
	20	unsigned int current_command = CMD_UNKNOWN;
	21
	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)
	27
	28	#define BLOCK_SIZE 0x100
	29
	30	static const uint8_t elf_ident[] = {
	31	0x7f, 'E', 'L', 'F',
	32	ELFCLASS32,
	33	ELFDATA2LSB,
	34	EV_CURRENT
	35	};
	36
	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)
	40	{
	41	Elf32_Phdr *phdr = phdrs;
	42	flash_seg_t *seg;
	43	uint32_t last_end = 0;
	44
	45	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	46	if (!ctx->segments) {
	47	fprintf(stderr, "Out of memory\n");
	48	return -1;
	49	}
	50	ctx->num_segs = 0;
	51	seg = ctx->segments;
	52
	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) {
	56	phdr++;
	57	continue;
	58	}
	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);
	65	if (!filesz) {
	66	phdr++;
	67	continue;
	68	}
	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' : ' ',
	74	offset);
	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");
78	return -1;
79	}
80	if (paddr < last_end) {
81	fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
82	return -1;
83	}
84	if (paddr < FLASH_START \|\| (paddr+filesz) > FLASH_END) {
85	fprintf(stderr, "Error: PHDR is not contained in Flash\n");
86	return -1;
87	}
88	if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
89	fprintf(stderr, "Error: Flash VMA segment is writable\n");
90	return -1;
91	}
92
93	uint8_t *data;
94	// make extra space if we need to move the data forward
95	data = malloc(filesz + BLOCK_SIZE);
96	if (!data) {
97	fprintf(stderr, "Out of memory\n");
98	return -1;
99	}
100	if (fseek(fd, offset, SEEK_SET) < 0 \|\| fread(data, 1, filesz, fd) != filesz) {
101	fprintf(stderr, "Error while reading PHDR payload\n");
102	free(data);
103	return -1;
104	}
105
106	uint32_t block_offset = paddr & (BLOCK_SIZE-1);
107	if (block_offset) {
108	if (ctx->num_segs) {
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);
113
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);
119	if (!new_data) {
120	fprintf(stderr, "Out of memory\n");
121	free(data);
122	return -1;
123	}
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);
129	if (hole)
130	fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
131	free(data);
132	free(prev_seg->data);
133	prev_seg->data = new_data;
134	prev_seg->length = new_length;
135	last_end = this_end;
136	phdr++;
137	continue;
138	}
139	}
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;
145	}
146
147	seg->data = data;
148	seg->start = paddr;
149	seg->length = filesz;
150	seg++;
151	ctx->num_segs++;
152
153	last_end = paddr + filesz;
154	phdr++;
155	}
156	return 0;
157	}
158
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];
163
164	if (seg->start & (BLOCK_SIZE-1)) {
165	fprintf(stderr, "Error: Segment is not aligned\n");
166	return -1;
167	}
168	if (seg->start < FLASH_START) {
169	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
170	return -1;
171	}
172	if (seg->start + seg->length > FLASH_END) {
173	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
174	return -1;
175	}
176	if (!can_write_bl && seg->start < BOOTLOADER_END) {
177	fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
178	return -1;
179	}
180	}
181	return 0;
182	}
183
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)
186	{
187	FILE *fd = NULL;
188	Elf32_Ehdr ehdr;
189	Elf32_Phdr *phdrs = NULL;
190	int num_phdrs;
191	int res;
192
193	fd = fopen(name, "rb");
194	if (!fd) {
195	fprintf(stderr, "Could not open file '%s': ", name);
196	perror(NULL);
197	goto fail;
198	}
199
200	fprintf(stderr, "Loading ELF file '%s'...\n", name);
201
202	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
203	fprintf(stderr, "Error while reading ELF file header\n");
204	goto fail;
205	}
206	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
207	\|\| le32(ehdr.e_version) != 1)
208	{
209	fprintf(stderr, "Not an ELF file or wrong ELF type\n");
210	goto fail;
211	}
212	if (le16(ehdr.e_type) != ET_EXEC) {
213	fprintf(stderr, "ELF is not executable\n");
214	goto fail;
215	}
216	if (le16(ehdr.e_machine) != EM_ARM) {
217	fprintf(stderr, "Wrong ELF architecture\n");
218	goto fail;
219	}
220	if (!ehdr.e_phnum \|\| !ehdr.e_phoff) {
221	fprintf(stderr, "ELF has no PHDRs\n");
222	goto fail;
223	}
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");
227	goto fail;
228	}
229	num_phdrs = le16(ehdr.e_phnum);
230
231	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
232	if (!phdrs) {
233	fprintf(stderr, "Out of memory\n");
234	goto fail;
235	}
236	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
237	fprintf(stderr, "Error while reading ELF PHDRs\n");
238	goto fail;
239	}
240	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
241	fprintf(stderr, "Error while reading ELF PHDRs\n");
242	goto fail;
243	}
244
245	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
246	if (res < 0)
247	goto fail;
248	res = check_segs(ctx, can_write_bl);
249	if (res < 0)
250	goto fail;
251
252	free(phdrs);
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	}
265
266	// Get the state of the proxmark, backwards compatible
267	static int get_proxmark_state(uint32_t *state)
268	{
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;
298	}
299
300	// Enter the bootloader to be able to start flashing
301	static int enter_bootloader(void)
302	{
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;
347	}
348
349	static int wait_for_ack(void)
350	{
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;
358	}
359
360	// Go into flashing mode
361	int flash_start_flashing(int enable_bl_writes)
362	{
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;
393	}
394
395	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
396	{
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();
416	}
417
418	// Write a file's segments to Flash
419	int flash_write(flash_file_t *ctx)
420	{
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;
456	}
457
458	// free a file context
459	void flash_free(flash_file_t *ctx)
460	{
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;
477	}