[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"
#include "comms.h"

#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, uint16_t 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, bool can_write_bl)
{
	FILE *fd = NULL;
	Elf32_Ehdr ehdr;
	Elf32_Phdr *phdrs = NULL;
	uint16_t 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 = {0};
	c.cmd = CMD_DEVICE_INFO;
	SendCommand(&c);
	UsbCommand resp;
	WaitForResponse(CMD_UNKNOWN, &resp);  // wait for any response. No timeout.

	// 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();

		bool opened = OpenProxmark(serial_port_name, true, 120);   // wait for 2 minutes
		if (opened) {
			fprintf(stderr," Found.\n");
			return 0;
		} else {
			fprintf(stderr,"Error: Proxmark not found.\n");
			return -1;
		}
	}

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

static int wait_for_ack(void)
{
	UsbCommand ack;
	WaitForResponse(CMD_UNKNOWN, &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"
ad939de5	23	#include "comms.h"
6e4d4ee6	24
8fe1a992	25	#define FLASH_START 0x100000
	26	#define FLASH_SIZE (256*1024)
	27	#define FLASH_END (FLASH_START + FLASH_SIZE)
	28	#define BOOTLOADER_SIZE 0x2000
	29	#define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
	30
28fdb04f	31	#define BLOCK_SIZE 0x200
8fe1a992	32
	33	static const uint8_t elf_ident[] = {
	34	0x7f, 'E', 'L', 'F',
	35	ELFCLASS32,
	36	ELFDATA2LSB,
	37	EV_CURRENT
	38	};
	39
f5ecd97b	40
8fe1a992	41	// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
8fe1a992	42	// unaligned segments if needed
44964fd1	43	static int build_segs_from_phdrs(flash_file_t ctx, FILE fd, Elf32_Phdr *phdrs, uint16_t num_phdrs)
7fe9b0b7	44	{
8fe1a992	45	Elf32_Phdr *phdr = phdrs;
	46	flash_seg_t *seg;
	47	uint32_t last_end = 0;
	48
	49	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	50	if (!ctx->segments) {
	51	fprintf(stderr, "Out of memory\n");
	52	return -1;
	53	}
	54	ctx->num_segs = 0;
	55	seg = ctx->segments;
	56
	57	fprintf(stderr, "Loading usable ELF segments:\n");
	58	for (int i = 0; i < num_phdrs; i++) {
	59	if (le32(phdr->p_type) != PT_LOAD) {
	60	phdr++;
	61	continue;
	62	}
	63	uint32_t vaddr = le32(phdr->p_vaddr);
	64	uint32_t paddr = le32(phdr->p_paddr);
	65	uint32_t filesz = le32(phdr->p_filesz);
	66	uint32_t memsz = le32(phdr->p_memsz);
	67	uint32_t offset = le32(phdr->p_offset);
	68	uint32_t flags = le32(phdr->p_flags);
	69	if (!filesz) {
	70	phdr++;
	71	continue;
	72	}
	73	fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
	74	i, vaddr, paddr, filesz, memsz,
	75	flags & PF_R ? 'R' : ' ',
	76	flags & PF_W ? 'W' : ' ',
	77	flags & PF_X ? 'X' : ' ',
	78	offset);
	79	if (filesz != memsz) {
	80	fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
	81	"(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
	82	return -1;
	83	}
	84	if (paddr < last_end) {
	85	fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
	86	return -1;
	87	}
	88	if (paddr < FLASH_START \|\| (paddr+filesz) > FLASH_END) {
	89	fprintf(stderr, "Error: PHDR is not contained in Flash\n");
	90	return -1;
	91	}
	92	if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
	93	fprintf(stderr, "Error: Flash VMA segment is writable\n");
	94	return -1;
	95	}
	96
	97	uint8_t *data;
	98	// make extra space if we need to move the data forward
	99	data = malloc(filesz + BLOCK_SIZE);
	100	if (!data) {
	101	fprintf(stderr, "Out of memory\n");
	102	return -1;
	103	}
	104	if (fseek(fd, offset, SEEK_SET) < 0 \|\| fread(data, 1, filesz, fd) != filesz) {
	105	fprintf(stderr, "Error while reading PHDR payload\n");
	106	free(data);
	107	return -1;
	108	}
109
110	uint32_t block_offset = paddr & (BLOCK_SIZE-1);
111	if (block_offset) {
112	if (ctx->num_segs) {
113	flash_seg_t *prev_seg = seg - 1;
114	uint32_t this_end = paddr + filesz;
115	uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
116	uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
117
118	if (this_firstblock == prev_lastblock) {
119	uint32_t new_length = this_end - prev_seg->start;
120	uint32_t this_offset = paddr - prev_seg->start;
121	uint32_t hole = this_offset - prev_seg->length;
122	uint8_t *new_data = malloc(new_length);
123	if (!new_data) {
124	fprintf(stderr, "Out of memory\n");
125	free(data);
126	return -1;
127	}
128	memset(new_data, 0xff, new_length);
129	memcpy(new_data, prev_seg->data, prev_seg->length);
130	memcpy(new_data + this_offset, data, filesz);
131	fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
132	prev_seg->length, new_length);
133	if (hole)
134	fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
135	free(data);
136	free(prev_seg->data);
137	prev_seg->data = new_data;
138	prev_seg->length = new_length;
139	last_end = this_end;
140	phdr++;
141	continue;
142	}
143	}
144	fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
145	memmove(data + block_offset, data, filesz);
146	memset(data, 0xFF, block_offset);
147	filesz += block_offset;
148	paddr -= block_offset;
149	}
150
151	seg->data = data;
152	seg->start = paddr;
153	seg->length = filesz;
154	seg++;
155	ctx->num_segs++;
156
157	last_end = paddr + filesz;
158	phdr++;
159	}
160	return 0;
6e4d4ee6	161	}
6e4d4ee6	162
8fe1a992	163	// Sanity check segments and check for bootloader writes
	164	static int check_segs(flash_file_t *ctx, int can_write_bl) {
	165	for (int i = 0; i < ctx->num_segs; i++) {
	166	flash_seg_t *seg = &ctx->segments[i];
	167
	168	if (seg->start & (BLOCK_SIZE-1)) {
	169	fprintf(stderr, "Error: Segment is not aligned\n");
	170	return -1;
	171	}
	172	if (seg->start < FLASH_START) {
	173	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	174	return -1;
	175	}
	176	if (seg->start + seg->length > FLASH_END) {
	177	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	178	return -1;
	179	}
	180	if (!can_write_bl && seg->start < BOOTLOADER_END) {
	181	fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
	182	return -1;
	183	}
	184	}
	185	return 0;
	186	}
	187
	188	// Load an ELF file and prepare it for flashing
ad939de5	189	int flash_load(flash_file_t ctx, const char name, bool can_write_bl)
8fe1a992	190	{
	191	FILE *fd = NULL;
	192	Elf32_Ehdr ehdr;
	193	Elf32_Phdr *phdrs = NULL;
44964fd1	194	uint16_t num_phdrs;
8fe1a992	195	int res;
	196
	197	fd = fopen(name, "rb");
	198	if (!fd) {
	199	fprintf(stderr, "Could not open file '%s': ", name);
	200	perror(NULL);
	201	goto fail;
	202	}
	203
	204	fprintf(stderr, "Loading ELF file '%s'...\n", name);
	205
	206	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
	207	fprintf(stderr, "Error while reading ELF file header\n");
	208	goto fail;
	209	}
	210	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
	211	\|\| le32(ehdr.e_version) != 1)
	212	{
	213	fprintf(stderr, "Not an ELF file or wrong ELF type\n");
	214	goto fail;
	215	}
	216	if (le16(ehdr.e_type) != ET_EXEC) {
	217	fprintf(stderr, "ELF is not executable\n");
	218	goto fail;
	219	}
	220	if (le16(ehdr.e_machine) != EM_ARM) {
	221	fprintf(stderr, "Wrong ELF architecture\n");
	222	goto fail;
	223	}
	224	if (!ehdr.e_phnum \|\| !ehdr.e_phoff) {
	225	fprintf(stderr, "ELF has no PHDRs\n");
	226	goto fail;
	227	}
	228	if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
	229	// could be a structure padding issue...
	230	fprintf(stderr, "Either the ELF file or this code is made of fail\n");
	231	goto fail;
	232	}
	233	num_phdrs = le16(ehdr.e_phnum);
	234
	235	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
	236	if (!phdrs) {
	237	fprintf(stderr, "Out of memory\n");
	238	goto fail;
	239	}
	240	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
	241	fprintf(stderr, "Error while reading ELF PHDRs\n");
	242	goto fail;
	243	}
	244	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
	245	fprintf(stderr, "Error while reading ELF PHDRs\n");
	246	goto fail;
	247	}
	248
	249	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
	250	if (res < 0)
	251	goto fail;
	252	res = check_segs(ctx, can_write_bl);
	253	if (res < 0)
	254	goto fail;
	255
66d6ba70	256	free(phdrs);
8fe1a992	257	fclose(fd);
	258	ctx->filename = name;
	259	return 0;
	260
	261	fail:
	262	if (phdrs)
	263	free(phdrs);
	264	if (fd)
	265	fclose(fd);
	266	flash_free(ctx);
	267	return -1;
	268	}
6e4d4ee6	269
8fe1a992	270	// Get the state of the proxmark, backwards compatible
8fe1a992	271	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	272	{
44964fd1	273	UsbCommand c = {0};
8fe1a992	274	c.cmd = CMD_DEVICE_INFO;
f5ecd97b	275	SendCommand(&c);
28fdb04f	276	UsbCommand resp;
ad939de5	277	WaitForResponse(CMD_UNKNOWN, &resp); // wait for any response. No timeout.
8fe1a992	278
	279	// Three outcomes:
	280	// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
	281	// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
	282	// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
	283
	284	switch (resp.cmd) {
	285	case CMD_ACK:
	286	*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
	287	break;
	288	case CMD_DEBUG_PRINT_STRING:
	289	*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
	290	break;
	291	case CMD_DEVICE_INFO:
	292	*state = resp.arg[0];
	293	break;
	294	default:
43534cba	295	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04" PRIx64 "\n", resp.cmd);
8fe1a992	296	return -1;
	297	break;
	298	}
	299
	300	return 0;
6e4d4ee6	301	}
6e4d4ee6	302
8fe1a992	303	// Enter the bootloader to be able to start flashing
3851172d	304	static int enter_bootloader(char *serial_port_name)
6e4d4ee6	305	{
8fe1a992	306	uint32_t state;
	307
	308	if (get_proxmark_state(&state) < 0)
	309	return -1;
	310
	311	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
	312	/* Already in flash state, we're done. */
	313	return 0;
	314	}
	315
	316	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
	317	fprintf(stderr,"Entering bootloader...\n");
28fdb04f	318	UsbCommand c;
8fe1a992	319	memset(&c, 0, sizeof (c));
	320
	321	if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
	322	&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
	323	{
	324	// New style handover: Send CMD_START_FLASH, which will reset the board
	325	// and enter the bootrom on the next boot.
	326	c.cmd = CMD_START_FLASH;
28fdb04f	327	SendCommand(&c);
8fe1a992	328	fprintf(stderr,"(Press and release the button only to abort)\n");
	329	} else {
	330	// Old style handover: Ask the user to press the button, then reset the board
	331	c.cmd = CMD_HARDWARE_RESET;
28fdb04f	332	SendCommand(&c);
8fe1a992	333	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
8fe1a992	334	}
61aaee35	335
f5ecd97b	336	msleep(100);
ad939de5	337	CloseProxmark();
61aaee35	338
929b61c6	339	bool opened = OpenProxmark(serial_port_name, true, 120); // wait for 2 minutes
ad939de5	340	if (opened) {
	341	fprintf(stderr," Found.\n");
	342	return 0;
	343	} else {
	344	fprintf(stderr,"Error: Proxmark not found.\n");
	345	return -1;
	346	}
8fe1a992	347	}
	348
	349	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	350	return -1;
6e4d4ee6	351	}
6e4d4ee6	352
3851172d	353	static int wait_for_ack(void)
6e4d4ee6	354	{
f5ecd97b	355	UsbCommand ack;
ad939de5	356	WaitForResponse(CMD_UNKNOWN, &ack);
3851172d	357	if (ack.cmd != CMD_ACK) {
3851172d	358	printf("Error: Unexpected reply 0x%04" PRIx64 " (expected ACK)\n", ack.cmd);
8fe1a992	359	return -1;
	360	}
	361	return 0;
6e4d4ee6	362	}
6e4d4ee6	363
8fe1a992	364	// Go into flashing mode
3851172d	365	int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
6e4d4ee6	366	{
8fe1a992	367	uint32_t state;
8fe1a992	368
3851172d	369	if (enter_bootloader(serial_port_name) < 0)
8fe1a992	370	return -1;
	371
	372	if (get_proxmark_state(&state) < 0)
	373	return -1;
	374
	375	if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
	376	// This command is stupid. Why the heck does it care which area we're
	377	// flashing, as long as it's not the bootloader area? The mind boggles.
28fdb04f	378	UsbCommand c = {CMD_START_FLASH};
8fe1a992	379
	380	if (enable_bl_writes) {
	381	c.arg[0] = FLASH_START;
	382	c.arg[1] = FLASH_END;
	383	c.arg[2] = START_FLASH_MAGIC;
	384	} else {
	385	c.arg[0] = BOOTLOADER_END;
	386	c.arg[1] = FLASH_END;
	387	c.arg[2] = 0;
	388	}
28fdb04f	389	SendCommand(&c);
8fe1a992	390	return wait_for_ack();
	391	} else {
	392	fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
	393	fprintf(stderr, " It is recommended that you update your bootloader\n\n");
	394	}
	395
	396	return 0;
6e4d4ee6	397	}
6e4d4ee6	398
8fe1a992	399	static int write_block(uint32_t address, uint8_t *data, uint32_t length)
6e4d4ee6	400	{
8fe1a992	401	uint8_t block_buf[BLOCK_SIZE];
	402
	403	memset(block_buf, 0xFF, BLOCK_SIZE);
	404	memcpy(block_buf, data, length);
ad939de5	405	UsbCommand c;
8fe1a992	406	c.cmd = CMD_FINISH_WRITE;
8fe1a992	407	c.arg[0] = address;
28fdb04f	408	memcpy(c.d.asBytes, block_buf, length);
ad939de5	409	SendCommand(&c);
ad939de5	410	return wait_for_ack();
6e4d4ee6	411	}
6e4d4ee6	412
8fe1a992	413	// Write a file's segments to Flash
8fe1a992	414	int flash_write(flash_file_t *ctx)
6e4d4ee6	415	{
8fe1a992	416	fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
	417	for (int i = 0; i < ctx->num_segs; i++) {
	418	flash_seg_t *seg = &ctx->segments[i];
	419
	420	uint32_t length = seg->length;
	421	uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
	422	uint32_t end = seg->start + length;
	423
	424	fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
	425	seg->start, end - 1, length, blocks);
	426
	427	int block = 0;
	428	uint8_t *data = seg->data;
	429	uint32_t baddr = seg->start;
	430
	431	while (length) {
	432	uint32_t block_size = length;
	433	if (block_size > BLOCK_SIZE)
	434	block_size = BLOCK_SIZE;
	435
	436	if (write_block(baddr, data, block_size) < 0) {
	437	fprintf(stderr, " ERROR\n");
	438	fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
	439	return -1;
	440	}
	441
	442	data += block_size;
	443	baddr += block_size;
	444	length -= block_size;
	445	block++;
	446	fprintf(stderr, ".");
	447	}
	448	fprintf(stderr, " OK\n");
	449	}
	450	return 0;
6e4d4ee6	451	}
6e4d4ee6	452
8fe1a992	453	// free a file context
8fe1a992	454	void flash_free(flash_file_t *ctx)
7fe9b0b7	455	{
8fe1a992	456	if (!ctx)
	457	return;
	458	if (ctx->segments) {
	459	for (int i = 0; i < ctx->num_segs; i++)
	460	free(ctx->segments[i].data);
	461	free(ctx->segments);
	462	ctx->segments = NULL;
	463	ctx->num_segs = 0;
	464	}
	465	}
	466
	467	// just reset the unit
3851172d	468	int flash_stop_flashing(void) {
28fdb04f	469	UsbCommand c = {CMD_HARDWARE_RESET};
f5ecd97b	470	SendCommand(&c);
	471	msleep(100);
	472	return 0;
6e4d4ee6	473	}