[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 "proxmark3.h"
#include "sleep.h"
//#include "proxusb.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);
  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"llx"\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%04"llx" (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);
//		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_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);
//		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);
	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);
  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>
125a98a1	14	#include "proxmark3.h"
4cd41f34	15	#include "sleep.h"
28fdb04f	16	//#include "proxusb.h"
6e4d4ee6	17	#include "flash.h"
2cab856f	18	#include "elf.h"
8fe1a992	19	#include "proxendian.h"
28fdb04f	20	#include "usb_cmd.h"
	21
	22	void SendCommand(UsbCommand* txcmd);
	23	void ReceiveCommand(UsbCommand* rxcmd);
	24	void CloseProxmark();
	25	int OpenProxmark(size_t i);
6e4d4ee6	26
0ae6234a	27	// FIXME: what the fuckity fuck
8fe1a992	28	unsigned int current_command = CMD_UNKNOWN;
	29
	30	#define FLASH_START 0x100000
	31	#define FLASH_SIZE (256*1024)
	32	#define FLASH_END (FLASH_START + FLASH_SIZE)
	33	#define BOOTLOADER_SIZE 0x2000
	34	#define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
	35
28fdb04f	36	#define BLOCK_SIZE 0x200
8fe1a992	37
	38	static const uint8_t elf_ident[] = {
	39	0x7f, 'E', 'L', 'F',
	40	ELFCLASS32,
	41	ELFDATA2LSB,
	42	EV_CURRENT
	43	};
	44
	45	// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
	46	// unaligned segments if needed
	47	static int build_segs_from_phdrs(flash_file_t ctx, FILE fd, Elf32_Phdr *phdrs, int num_phdrs)
7fe9b0b7	48	{
8fe1a992	49	Elf32_Phdr *phdr = phdrs;
	50	flash_seg_t *seg;
	51	uint32_t last_end = 0;
	52
	53	ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
	54	if (!ctx->segments) {
	55	fprintf(stderr, "Out of memory\n");
	56	return -1;
	57	}
	58	ctx->num_segs = 0;
	59	seg = ctx->segments;
	60
	61	fprintf(stderr, "Loading usable ELF segments:\n");
	62	for (int i = 0; i < num_phdrs; i++) {
	63	if (le32(phdr->p_type) != PT_LOAD) {
	64	phdr++;
	65	continue;
	66	}
	67	uint32_t vaddr = le32(phdr->p_vaddr);
	68	uint32_t paddr = le32(phdr->p_paddr);
	69	uint32_t filesz = le32(phdr->p_filesz);
	70	uint32_t memsz = le32(phdr->p_memsz);
	71	uint32_t offset = le32(phdr->p_offset);
	72	uint32_t flags = le32(phdr->p_flags);
	73	if (!filesz) {
	74	phdr++;
	75	continue;
	76	}
	77	fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
	78	i, vaddr, paddr, filesz, memsz,
	79	flags & PF_R ? 'R' : ' ',
	80	flags & PF_W ? 'W' : ' ',
	81	flags & PF_X ? 'X' : ' ',
	82	offset);
	83	if (filesz != memsz) {
	84	fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
	85	"(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
	86	return -1;
	87	}
	88	if (paddr < last_end) {
	89	fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
	90	return -1;
	91	}
	92	if (paddr < FLASH_START \|\| (paddr+filesz) > FLASH_END) {
	93	fprintf(stderr, "Error: PHDR is not contained in Flash\n");
	94	return -1;
	95	}
	96	if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
	97	fprintf(stderr, "Error: Flash VMA segment is writable\n");
	98	return -1;
	99	}
	100
	101	uint8_t *data;
	102	// make extra space if we need to move the data forward
	103	data = malloc(filesz + BLOCK_SIZE);
	104	if (!data) {
	105	fprintf(stderr, "Out of memory\n");
	106	return -1;
	107	}
	108	if (fseek(fd, offset, SEEK_SET) < 0 \|\| fread(data, 1, filesz, fd) != filesz) {
	109	fprintf(stderr, "Error while reading PHDR payload\n");
	110	free(data);
	111	return -1;
	112	}
113
114	uint32_t block_offset = paddr & (BLOCK_SIZE-1);
115	if (block_offset) {
116	if (ctx->num_segs) {
117	flash_seg_t *prev_seg = seg - 1;
118	uint32_t this_end = paddr + filesz;
119	uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
120	uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
121
122	if (this_firstblock == prev_lastblock) {
123	uint32_t new_length = this_end - prev_seg->start;
124	uint32_t this_offset = paddr - prev_seg->start;
125	uint32_t hole = this_offset - prev_seg->length;
126	uint8_t *new_data = malloc(new_length);
127	if (!new_data) {
128	fprintf(stderr, "Out of memory\n");
129	free(data);
130	return -1;
131	}
132	memset(new_data, 0xff, new_length);
133	memcpy(new_data, prev_seg->data, prev_seg->length);
134	memcpy(new_data + this_offset, data, filesz);
135	fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
136	prev_seg->length, new_length);
137	if (hole)
138	fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
139	free(data);
140	free(prev_seg->data);
141	prev_seg->data = new_data;
142	prev_seg->length = new_length;
143	last_end = this_end;
144	phdr++;
145	continue;
146	}
147	}
148	fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
149	memmove(data + block_offset, data, filesz);
150	memset(data, 0xFF, block_offset);
151	filesz += block_offset;
152	paddr -= block_offset;
153	}
154
155	seg->data = data;
156	seg->start = paddr;
157	seg->length = filesz;
158	seg++;
159	ctx->num_segs++;
160
161	last_end = paddr + filesz;
162	phdr++;
163	}
164	return 0;
6e4d4ee6	165	}
6e4d4ee6	166
8fe1a992	167	// Sanity check segments and check for bootloader writes
	168	static int check_segs(flash_file_t *ctx, int can_write_bl) {
	169	for (int i = 0; i < ctx->num_segs; i++) {
	170	flash_seg_t *seg = &ctx->segments[i];
	171
	172	if (seg->start & (BLOCK_SIZE-1)) {
	173	fprintf(stderr, "Error: Segment is not aligned\n");
	174	return -1;
	175	}
	176	if (seg->start < FLASH_START) {
	177	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	178	return -1;
	179	}
	180	if (seg->start + seg->length > FLASH_END) {
	181	fprintf(stderr, "Error: Segment is outside of flash bounds\n");
	182	return -1;
	183	}
	184	if (!can_write_bl && seg->start < BOOTLOADER_END) {
	185	fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
	186	return -1;
	187	}
	188	}
	189	return 0;
	190	}
	191
	192	// Load an ELF file and prepare it for flashing
	193	int flash_load(flash_file_t ctx, const char name, int can_write_bl)
	194	{
	195	FILE *fd = NULL;
	196	Elf32_Ehdr ehdr;
	197	Elf32_Phdr *phdrs = NULL;
	198	int num_phdrs;
	199	int res;
	200
	201	fd = fopen(name, "rb");
	202	if (!fd) {
	203	fprintf(stderr, "Could not open file '%s': ", name);
	204	perror(NULL);
	205	goto fail;
	206	}
	207
	208	fprintf(stderr, "Loading ELF file '%s'...\n", name);
	209
	210	if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
	211	fprintf(stderr, "Error while reading ELF file header\n");
	212	goto fail;
	213	}
	214	if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
	215	\|\| le32(ehdr.e_version) != 1)
	216	{
	217	fprintf(stderr, "Not an ELF file or wrong ELF type\n");
	218	goto fail;
	219	}
	220	if (le16(ehdr.e_type) != ET_EXEC) {
	221	fprintf(stderr, "ELF is not executable\n");
	222	goto fail;
	223	}
	224	if (le16(ehdr.e_machine) != EM_ARM) {
	225	fprintf(stderr, "Wrong ELF architecture\n");
	226	goto fail;
	227	}
	228	if (!ehdr.e_phnum \|\| !ehdr.e_phoff) {
	229	fprintf(stderr, "ELF has no PHDRs\n");
	230	goto fail;
231	}
232	if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
233	// could be a structure padding issue...
234	fprintf(stderr, "Either the ELF file or this code is made of fail\n");
235	goto fail;
236	}
237	num_phdrs = le16(ehdr.e_phnum);
238
239	phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
240	if (!phdrs) {
241	fprintf(stderr, "Out of memory\n");
242	goto fail;
243	}
244	if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
245	fprintf(stderr, "Error while reading ELF PHDRs\n");
246	goto fail;
247	}
248	if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
249	fprintf(stderr, "Error while reading ELF PHDRs\n");
250	goto fail;
251	}
252
253	res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
254	if (res < 0)
255	goto fail;
256	res = check_segs(ctx, can_write_bl);
257	if (res < 0)
258	goto fail;
259
66d6ba70	260	free(phdrs);
8fe1a992	261	fclose(fd);
	262	ctx->filename = name;
	263	return 0;
	264
	265	fail:
	266	if (phdrs)
	267	free(phdrs);
	268	if (fd)
	269	fclose(fd);
	270	flash_free(ctx);
	271	return -1;
	272	}
6e4d4ee6	273
8fe1a992	274	// Get the state of the proxmark, backwards compatible
8fe1a992	275	static int get_proxmark_state(uint32_t *state)
6e4d4ee6	276	{
28fdb04f	277	UsbCommand c;
8fe1a992	278	c.cmd = CMD_DEVICE_INFO;
28fdb04f	279	// SendCommand_(&c);
	280	SendCommand(&c);
	281	UsbCommand resp;
8fe1a992	282	ReceiveCommand(&resp);
	283
	284	// Three outcomes:
	285	// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
	286	// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
	287	// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
	288
	289	switch (resp.cmd) {
	290	case CMD_ACK:
	291	*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
	292	break;
	293	case CMD_DEBUG_PRINT_STRING:
	294	*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
	295	break;
	296	case CMD_DEVICE_INFO:
	297	*state = resp.arg[0];
	298	break;
	299	default:
125a98a1	300	fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04"llx"\n", resp.cmd);
8fe1a992	301	return -1;
	302	break;
	303	}
	304
	305	return 0;
6e4d4ee6	306	}
6e4d4ee6	307
8fe1a992	308	// Enter the bootloader to be able to start flashing
8fe1a992	309	static int enter_bootloader(void)
6e4d4ee6	310	{
8fe1a992	311	uint32_t state;
	312
	313	if (get_proxmark_state(&state) < 0)
	314	return -1;
	315
	316	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
	317	/* Already in flash state, we're done. */
	318	return 0;
	319	}
	320
	321	if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
	322	fprintf(stderr,"Entering bootloader...\n");
28fdb04f	323	UsbCommand c;
8fe1a992	324	memset(&c, 0, sizeof (c));
	325
	326	if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
	327	&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
	328	{
	329	// New style handover: Send CMD_START_FLASH, which will reset the board
	330	// and enter the bootrom on the next boot.
	331	c.cmd = CMD_START_FLASH;
28fdb04f	332	SendCommand(&c);
8fe1a992	333	fprintf(stderr,"(Press and release the button only to abort)\n");
	334	} else {
	335	// Old style handover: Ask the user to press the button, then reset the board
	336	c.cmd = CMD_HARDWARE_RESET;
28fdb04f	337	SendCommand(&c);
8fe1a992	338	fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
	339	}
	340	fprintf(stderr,"Waiting for Proxmark to reappear on USB...");
	341
	342	CloseProxmark();
	343	sleep(1);
	344	while (!OpenProxmark(0)) {
	345	sleep(1);
	346	fprintf(stderr, ".");
	347	}
	348	fprintf(stderr," Found.\n");
	349
	350	return 0;
	351	}
	352
	353	fprintf(stderr, "Error: Unknown Proxmark mode\n");
	354	return -1;
6e4d4ee6	355	}
6e4d4ee6	356
8fe1a992	357	static int wait_for_ack(void)
6e4d4ee6	358	{
28fdb04f	359	UsbCommand ack;
8fe1a992	360	ReceiveCommand(&ack);
8fe1a992	361	if (ack.cmd != CMD_ACK) {
125a98a1	362	printf("Error: Unexpected reply 0x%04"llx" (expected ACK)\n", ack.cmd);
8fe1a992	363	return -1;
	364	}
	365	return 0;
6e4d4ee6	366	}
6e4d4ee6	367
8fe1a992	368	// Go into flashing mode
8fe1a992	369	int flash_start_flashing(int enable_bl_writes)
6e4d4ee6	370	{
8fe1a992	371	uint32_t state;
	372
	373	if (enter_bootloader() < 0)
	374	return -1;
	375
	376	if (get_proxmark_state(&state) < 0)
	377	return -1;
	378
	379	if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
	380	// This command is stupid. Why the heck does it care which area we're
	381	// flashing, as long as it's not the bootloader area? The mind boggles.
28fdb04f	382	UsbCommand c = {CMD_START_FLASH};
8fe1a992	383
	384	if (enable_bl_writes) {
	385	c.arg[0] = FLASH_START;
	386	c.arg[1] = FLASH_END;
	387	c.arg[2] = START_FLASH_MAGIC;
	388	} else {
	389	c.arg[0] = BOOTLOADER_END;
	390	c.arg[1] = FLASH_END;
	391	c.arg[2] = 0;
	392	}
28fdb04f	393	SendCommand(&c);
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;
	411	/*
	412	c.cmd = {CMD_SETUP_WRITE};
8fe1a992	413	for (int i = 0; i < 240; i += 48) {
	414	memcpy(c.d.asBytes, block_buf + i, 48);
	415	c.arg[0] = i / 4;
28fdb04f	416	SendCommand(&c);
	417	// SendCommand_(&c);
	418	if (wait_for_ack() < 0) {
8fe1a992	419	return -1;
28fdb04f	420	}
8fe1a992	421	}
28fdb04f	422	*/
8fe1a992	423	c.cmd = CMD_FINISH_WRITE;
8fe1a992	424	c.arg[0] = address;
28fdb04f	425	// memcpy(c.d.asBytes, block_buf+240, 16);
	426	// SendCommand_(&c);
	427	memcpy(c.d.asBytes, block_buf, length);
	428	SendCommand(&c);
	429	return wait_for_ack();
6e4d4ee6	430	}
6e4d4ee6	431
8fe1a992	432	// Write a file's segments to Flash
8fe1a992	433	int flash_write(flash_file_t *ctx)
6e4d4ee6	434	{
8fe1a992	435	fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
	436	for (int i = 0; i < ctx->num_segs; i++) {
	437	flash_seg_t *seg = &ctx->segments[i];
	438
	439	uint32_t length = seg->length;
	440	uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
	441	uint32_t end = seg->start + length;
	442
	443	fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
	444	seg->start, end - 1, length, blocks);
	445
	446	int block = 0;
	447	uint8_t *data = seg->data;
	448	uint32_t baddr = seg->start;
	449
	450	while (length) {
	451	uint32_t block_size = length;
	452	if (block_size > BLOCK_SIZE)
	453	block_size = BLOCK_SIZE;
	454
	455	if (write_block(baddr, data, block_size) < 0) {
	456	fprintf(stderr, " ERROR\n");
	457	fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
	458	return -1;
	459	}
	460
	461	data += block_size;
	462	baddr += block_size;
	463	length -= block_size;
	464	block++;
	465	fprintf(stderr, ".");
	466	}
	467	fprintf(stderr, " OK\n");
	468	}
	469	return 0;
6e4d4ee6	470	}
6e4d4ee6	471
8fe1a992	472	// free a file context
8fe1a992	473	void flash_free(flash_file_t *ctx)
7fe9b0b7	474	{
8fe1a992	475	if (!ctx)
	476	return;
	477	if (ctx->segments) {
	478	for (int i = 0; i < ctx->num_segs; i++)
	479	free(ctx->segments[i].data);
	480	free(ctx->segments);
	481	ctx->segments = NULL;
	482	ctx->num_segs = 0;
	483	}
	484	}
	485
	486	// just reset the unit
	487	int flash_stop_flashing(void) {
28fdb04f	488	UsbCommand c = {CMD_HARDWARE_RESET};
	489	// SendCommand_(&c);
	490	SendCommand(&c);
	491	return 0;
6e4d4ee6	492	}