[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 <inttypes.h>
#include <unistd.h>
#include "proxmark3.h"
#include "util.h"
#include "util_posix.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" PRIx64 "\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" PRIx64 " (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>
43534cba	14	#include <inttypes.h>
acf0582d	15	#include <unistd.h>
125a98a1	16	#include "proxmark3.h"
acf0582d	17	#include "util.h"
ec9c7112	18	#include "util_posix.h"
6e4d4ee6	19	#include "flash.h"
2cab856f	20	#include "elf.h"
8fe1a992	21	#include "proxendian.h"
28fdb04f	22	#include "usb_cmd.h"
	23
	24	void SendCommand(UsbCommand* txcmd);
	25	void ReceiveCommand(UsbCommand* rxcmd);
	26	void CloseProxmark();
	27	int OpenProxmark(size_t i);
6e4d4ee6	28
0ae6234a	29	// FIXME: what the fuckity fuck
8fe1a992	30	unsigned int current_command = CMD_UNKNOWN;
	31
	32	#define FLASH_START 0x100000
	33	#define FLASH_SIZE (256*1024)
	34	#define FLASH_END (FLASH_START + FLASH_SIZE)
	35	#define BOOTLOADER_SIZE 0x2000
	36	#define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
	37
28fdb04f	38	#define BLOCK_SIZE 0x200
8fe1a992	39
	40	static const uint8_t elf_ident[] = {
	41	0x7f, 'E', 'L', 'F',
	42	ELFCLASS32,
	43	ELFDATA2LSB,
	44	EV_CURRENT
	45	};
	46
	47	// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
	48	// unaligned segments if needed
	49	static int build_segs_from_phdrs(flash_file_t ctx, FILE fd, Elf32_Phdr *phdrs, int num_phdrs)
7fe9b0b7	50	{
8fe1a992	51	Elf32_Phdr *phdr = phdrs;
	52	flash_seg_t *seg;
	53	uint32_t last_end = 0;
	54
	55	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	56	if (!ctx->segments) {
	57	fprintf(stderr, "Out of memory\n");
	58	return -1;
	59	}
	60	ctx->num_segs = 0;
	61	seg = ctx->segments;
	62
	63	fprintf(stderr, "Loading usable ELF segments:\n");
	64	for (int i = 0; i < num_phdrs; i++) {
	65	if (le32(phdr->p_type) != PT_LOAD) {
	66	phdr++;
	67	continue;
	68	}
	69	uint32_t vaddr = le32(phdr->p_vaddr);
	70	uint32_t paddr = le32(phdr->p_paddr);
	71	uint32_t filesz = le32(phdr->p_filesz);
	72	uint32_t memsz = le32(phdr->p_memsz);
	73	uint32_t offset = le32(phdr->p_offset);
	74	uint32_t flags = le32(phdr->p_flags);
	75	if (!filesz) {
	76	phdr++;
	77	continue;
	78	}
	79	fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
	80	i, vaddr, paddr, filesz, memsz,
	81	flags & PF_R ? 'R' : ' ',
	82	flags & PF_W ? 'W' : ' ',
	83	flags & PF_X ? 'X' : ' ',
	84	offset);
	85	if (filesz != memsz) {
	86	fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
	87	"(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
	88	return -1;
	89	}
	90	if (paddr < last_end) {
	91	fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
	92	return -1;
	93	}
	94	if (paddr < FLASH_START \|\| (paddr+filesz) > FLASH_END) {
	95	fprintf(stderr, "Error: PHDR is not contained in Flash\n");
	96	return -1;
	97	}
	98	if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
	99	fprintf(stderr, "Error: Flash VMA segment is writable\n");
	100	return -1;
	101	}
	102
	103	uint8_t *data;
	104	// make extra space if we need to move the data forward
	105	data = malloc(filesz + BLOCK_SIZE);
	106	if (!data) {
	107	fprintf(stderr, "Out of memory\n");
	108	return -1;
	109	}
	110	if (fseek(fd, offset, SEEK_SET) < 0 \|\| fread(data, 1, filesz, fd) != filesz) {
	111	fprintf(stderr, "Error while reading PHDR payload\n");
	112	free(data);
	113	return -1;
	114	}
115
116	uint32_t block_offset = paddr & (BLOCK_SIZE-1);
117	if (block_offset) {
118	if (ctx->num_segs) {
119	flash_seg_t *prev_seg = seg - 1;
120	uint32_t this_end = paddr + filesz;
121	uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
122	uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
123
124	if (this_firstblock == prev_lastblock) {
125	uint32_t new_length = this_end - prev_seg->start;
126	uint32_t this_offset = paddr - prev_seg->start;
127	uint32_t hole = this_offset - prev_seg->length;
128	uint8_t *new_data = malloc(new_length);
129	if (!new_data) {
130	fprintf(stderr, "Out of memory\n");
131	free(data);
132	return -1;
133	}
134	memset(new_data, 0xff, new_length);
135	memcpy(new_data, prev_seg->data, prev_seg->length);
136	memcpy(new_data + this_offset, data, filesz);
137	fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
138	prev_seg->length, new_length);
139	if (hole)
140	fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
141	free(data);
142	free(prev_seg->data);
143	prev_seg->data = new_data;
144	prev_seg->length = new_length;
145	last_end = this_end;
146	phdr++;
147	continue;
148	}
149	}
150	fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
151	memmove(data + block_offset, data, filesz);
152	memset(data, 0xFF, block_offset);
153	filesz += block_offset;
154	paddr -= block_offset;
155	}
156
157	seg->data = data;
158	seg->start = paddr;
159	seg->length = filesz;
160	seg++;
161	ctx->num_segs++;
162
163	last_end = paddr + filesz;
164	phdr++;
165	}
166	return 0;
6e4d4ee6	167	}
6e4d4ee6	168
8fe1a992	169	// Sanity check segments and check for bootloader writes
	170	static int check_segs(flash_file_t *ctx, int can_write_bl) {
	171	for (int i = 0; i < ctx->num_segs; i++) {
	172	flash_seg_t *seg = &ctx->segments[i];
	173
	174	if (seg->start & (BLOCK_SIZE-1)) {
	175	fprintf(stderr, "Error: Segment is not aligned\n");
	176	return -1;
	177	}
	178	if (seg->start < FLASH_START) {
	179	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	180	return -1;
	181	}
	182	if (seg->start + seg->length > FLASH_END) {
	183	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	184	return -1;
	185	}
	186	if (!can_write_bl && seg->start < BOOTLOADER_END) {
	187	fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
	188	return -1;
	189	}
	190	}
	191	return 0;
	192	}
	193
	194	// Load an ELF file and prepare it for flashing
	195	int flash_load(flash_file_t ctx, const char name, int can_write_bl)
	196	{
	197	FILE *fd = NULL;
	198	Elf32_Ehdr ehdr;
	199	Elf32_Phdr *phdrs = NULL;
	200	int num_phdrs;
	201	int res;
	202
	203	fd = fopen(name, "rb");
	204	if (!fd) {
	205	fprintf(stderr, "Could not open file '%s': ", name);
	206	perror(NULL);
	207	goto fail;
	208	}
	209
	210	fprintf(stderr, "Loading ELF file '%s'...\n", name);
	211
	212	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
	213	fprintf(stderr, "Error while reading ELF file header\n");
	214	goto fail;
	215	}
	216	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
	217	\|\| le32(ehdr.e_version) != 1)
	218	{
	219	fprintf(stderr, "Not an ELF file or wrong ELF type\n");
	220	goto fail;
	221	}
	222	if (le16(ehdr.e_type) != ET_EXEC) {
	223	fprintf(stderr, "ELF is not executable\n");
	224	goto fail;
	225	}
	226	if (le16(ehdr.e_machine) != EM_ARM) {
	227	fprintf(stderr, "Wrong ELF architecture\n");
	228	goto fail;
	229	}
	230	if (!ehdr.e_phnum \|\| !ehdr.e_phoff) {
	231	fprintf(stderr, "ELF has no PHDRs\n");
	232	goto fail;
233	}
234	if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
235	// could be a structure padding issue...
236	fprintf(stderr, "Either the ELF file or this code is made of fail\n");
237	goto fail;
238	}
239	num_phdrs = le16(ehdr.e_phnum);
240
241	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
242	if (!phdrs) {
243	fprintf(stderr, "Out of memory\n");
244	goto fail;
245	}
246	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
247	fprintf(stderr, "Error while reading ELF PHDRs\n");
248	goto fail;
249	}
250	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
251	fprintf(stderr, "Error while reading ELF PHDRs\n");
252	goto fail;
253	}
254
255	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
256	if (res < 0)
257	goto fail;
258	res = check_segs(ctx, can_write_bl);
259	if (res < 0)
260	goto fail;
261
66d6ba70	262	free(phdrs);
8fe1a992	263	fclose(fd);
	264	ctx->filename = name;
	265	return 0;
	266
	267	fail:
	268	if (phdrs)
	269	free(phdrs);
	270	if (fd)
	271	fclose(fd);
	272	flash_free(ctx);
	273	return -1;
	274	}
6e4d4ee6	275
8fe1a992	276	// Get the state of the proxmark, backwards compatible
8fe1a992	277	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	278	{
28fdb04f	279	UsbCommand c;
8fe1a992	280	c.cmd = CMD_DEVICE_INFO;
28fdb04f	281	SendCommand(&c);
28fdb04f	282	UsbCommand resp;
8fe1a992	283	ReceiveCommand(&resp);
	284
	285	// Three outcomes:
	286	// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
	287	// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
	288	// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
	289
	290	switch (resp.cmd) {
	291	case CMD_ACK:
	292	*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
	293	break;
	294	case CMD_DEBUG_PRINT_STRING:
	295	*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
	296	break;
	297	case CMD_DEVICE_INFO:
	298	*state = resp.arg[0];
	299	break;
	300	default:
43534cba	301	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04" PRIx64 "\n", resp.cmd);
8fe1a992	302	return -1;
	303	break;
	304	}
	305
	306	return 0;
6e4d4ee6	307	}
6e4d4ee6	308
8fe1a992	309	// Enter the bootloader to be able to start flashing
e12b82d3	310	static int enter_bootloader(char *serial_port_name)
6e4d4ee6	311	{
8fe1a992	312	uint32_t state;
	313
	314	if (get_proxmark_state(&state) < 0)
	315	return -1;
	316
	317	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
	318	/* Already in flash state, we're done. */
	319	return 0;
	320	}
	321
	322	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
	323	fprintf(stderr,"Entering bootloader...\n");
28fdb04f	324	UsbCommand c;
8fe1a992	325	memset(&c, 0, sizeof (c));
	326
	327	if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
	328	&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
	329	{
	330	// New style handover: Send CMD_START_FLASH, which will reset the board
	331	// and enter the bootrom on the next boot.
	332	c.cmd = CMD_START_FLASH;
28fdb04f	333	SendCommand(&c);
8fe1a992	334	fprintf(stderr,"(Press and release the button only to abort)\n");
	335	} else {
	336	// Old style handover: Ask the user to press the button, then reset the board
	337	c.cmd = CMD_HARDWARE_RESET;
28fdb04f	338	SendCommand(&c);
8fe1a992	339	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
8fe1a992	340	}
d8193fa5	341	msleep(100);
8fe1a992	342	CloseProxmark();
d8193fa5	343
e654346b	344	fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
d8193fa5	345	do {
8fe1a992	346	sleep(1);
8fe1a992	347	fprintf(stderr, ".");
d8193fa5	348	} while (!OpenProxmark(0));
8fe1a992	349	fprintf(stderr," Found.\n");
	350
	351	return 0;
	352	}
	353
	354	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	355	return -1;
6e4d4ee6	356	}
6e4d4ee6	357
8fe1a992	358	static int wait_for_ack(void)
6e4d4ee6	359	{
28fdb04f	360	UsbCommand ack;
8fe1a992	361	ReceiveCommand(&ack);
8fe1a992	362	if (ack.cmd != CMD_ACK) {
43534cba	363	printf("Error: Unexpected reply 0x%04" PRIx64 " (expected ACK)\n", ack.cmd);
8fe1a992	364	return -1;
	365	}
	366	return 0;
6e4d4ee6	367	}
6e4d4ee6	368
8fe1a992	369	// Go into flashing mode
e12b82d3	370	int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
6e4d4ee6	371	{
8fe1a992	372	uint32_t state;
8fe1a992	373
e12b82d3	374	if (enter_bootloader(serial_port_name) < 0)
8fe1a992	375	return -1;
	376
	377	if (get_proxmark_state(&state) < 0)
	378	return -1;
	379
	380	if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
	381	// This command is stupid. Why the heck does it care which area we're
	382	// flashing, as long as it's not the bootloader area? The mind boggles.
28fdb04f	383	UsbCommand c = {CMD_START_FLASH};
8fe1a992	384
	385	if (enable_bl_writes) {
	386	c.arg[0] = FLASH_START;
	387	c.arg[1] = FLASH_END;
	388	c.arg[2] = START_FLASH_MAGIC;
	389	} else {
	390	c.arg[0] = BOOTLOADER_END;
	391	c.arg[1] = FLASH_END;
	392	c.arg[2] = 0;
	393	}
28fdb04f	394	SendCommand(&c);
8fe1a992	395	return wait_for_ack();
	396	} else {
	397	fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
	398	fprintf(stderr, " It is recommended that you update your bootloader\n\n");
	399	}
	400
	401	return 0;
6e4d4ee6	402	}
6e4d4ee6	403
8fe1a992	404	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
6e4d4ee6	405	{
8fe1a992	406	uint8_t block_buf[BLOCK_SIZE];
	407
	408	memset(block_buf, 0xFF, BLOCK_SIZE);
	409	memcpy(block_buf, data, length);
28fdb04f	410	UsbCommand c;
8fe1a992	411	c.cmd = CMD_FINISH_WRITE;
8fe1a992	412	c.arg[0] = address;
28fdb04f	413	memcpy(c.d.asBytes, block_buf, length);
	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) {
28fdb04f	474	UsbCommand c = {CMD_HARDWARE_RESET};
28fdb04f	475	SendCommand(&c);
d8193fa5	476	msleep(100);
28fdb04f	477	return 0;
6e4d4ee6	478	}