mirror of
https://github.com/Proxmark/proxmark3.git
synced 2024-09-21 15:26:35 +08:00
CHG: USB_CMD_DATA_SIZE is now used as maxsize for transfer of data between client and pm3device CHG: suggested a fix for the underscore problem in ioclass\fileutils.c ADD: tnp3xx support ADD: nxp tag idents. ADD: identifiction of chinese backdoor commands to hf 14a reader.
476 lines
12 KiB
C
476 lines
12 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2010 Hector Martin "marcan" <marcan@marcansoft.com>
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// ELF file flasher
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//-----------------------------------------------------------------------------
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "proxmark3.h"
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#include "sleep.h"
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#include "flash.h"
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#include "elf.h"
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#include "proxendian.h"
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#include "usb_cmd.h"
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void SendCommand(UsbCommand* txcmd);
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void ReceiveCommand(UsbCommand* rxcmd);
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void CloseProxmark();
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int OpenProxmark(size_t i);
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// FIXME: what the fuckity fuck
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unsigned int current_command = CMD_UNKNOWN;
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#define FLASH_START 0x100000
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#define FLASH_SIZE (256*1024)
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#define FLASH_END (FLASH_START + FLASH_SIZE)
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#define BOOTLOADER_SIZE 0x2000
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#define BOOTLOADER_END (FLASH_START + BOOTLOADER_SIZE)
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#define BLOCK_SIZE 0x200
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static const uint8_t elf_ident[] = {
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0x7f, 'E', 'L', 'F',
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ELFCLASS32,
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ELFDATA2LSB,
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EV_CURRENT
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};
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// Turn PHDRs into flasher segments, checking for PHDR sanity and merging adjacent
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// unaligned segments if needed
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static int build_segs_from_phdrs(flash_file_t *ctx, FILE *fd, Elf32_Phdr *phdrs, int num_phdrs)
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{
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Elf32_Phdr *phdr = phdrs;
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flash_seg_t *seg;
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uint32_t last_end = 0;
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ctx->segments = malloc(sizeof(flash_seg_t) * num_phdrs);
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if (!ctx->segments) {
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fprintf(stderr, "Out of memory\n");
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return -1;
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}
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ctx->num_segs = 0;
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seg = ctx->segments;
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fprintf(stderr, "Loading usable ELF segments:\n");
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for (int i = 0; i < num_phdrs; i++) {
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if (le32(phdr->p_type) != PT_LOAD) {
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phdr++;
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continue;
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}
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uint32_t vaddr = le32(phdr->p_vaddr);
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uint32_t paddr = le32(phdr->p_paddr);
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uint32_t filesz = le32(phdr->p_filesz);
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uint32_t memsz = le32(phdr->p_memsz);
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uint32_t offset = le32(phdr->p_offset);
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uint32_t flags = le32(phdr->p_flags);
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if (!filesz) {
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phdr++;
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continue;
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}
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fprintf(stderr, "%d: V 0x%08x P 0x%08x (0x%08x->0x%08x) [%c%c%c] @0x%x\n",
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i, vaddr, paddr, filesz, memsz,
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flags & PF_R ? 'R' : ' ',
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flags & PF_W ? 'W' : ' ',
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flags & PF_X ? 'X' : ' ',
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offset);
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if (filesz != memsz) {
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fprintf(stderr, "Error: PHDR file size does not equal memory size\n"
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"(DATA+BSS PHDRs do not make sense on ROM platforms!)\n");
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return -1;
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}
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if (paddr < last_end) {
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fprintf(stderr, "Error: PHDRs not sorted or overlap\n");
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return -1;
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}
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if (paddr < FLASH_START || (paddr+filesz) > FLASH_END) {
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fprintf(stderr, "Error: PHDR is not contained in Flash\n");
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return -1;
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}
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if (vaddr >= FLASH_START && vaddr < FLASH_END && (flags & PF_W)) {
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fprintf(stderr, "Error: Flash VMA segment is writable\n");
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return -1;
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}
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uint8_t *data;
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// make extra space if we need to move the data forward
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data = malloc(filesz + BLOCK_SIZE);
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if (!data) {
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fprintf(stderr, "Out of memory\n");
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return -1;
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}
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if (fseek(fd, offset, SEEK_SET) < 0 || fread(data, 1, filesz, fd) != filesz) {
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fprintf(stderr, "Error while reading PHDR payload\n");
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free(data);
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return -1;
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}
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uint32_t block_offset = paddr & (BLOCK_SIZE-1);
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if (block_offset) {
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if (ctx->num_segs) {
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flash_seg_t *prev_seg = seg - 1;
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uint32_t this_end = paddr + filesz;
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uint32_t this_firstblock = paddr & ~(BLOCK_SIZE-1);
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uint32_t prev_lastblock = (last_end - 1) & ~(BLOCK_SIZE-1);
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if (this_firstblock == prev_lastblock) {
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uint32_t new_length = this_end - prev_seg->start;
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uint32_t this_offset = paddr - prev_seg->start;
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uint32_t hole = this_offset - prev_seg->length;
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uint8_t *new_data = malloc(new_length);
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if (!new_data) {
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fprintf(stderr, "Out of memory\n");
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free(data);
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return -1;
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}
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memset(new_data, 0xff, new_length);
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memcpy(new_data, prev_seg->data, prev_seg->length);
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memcpy(new_data + this_offset, data, filesz);
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fprintf(stderr, "Note: Extending previous segment from 0x%x to 0x%x bytes\n",
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prev_seg->length, new_length);
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if (hole)
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fprintf(stderr, "Note: 0x%x-byte hole created\n", hole);
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free(data);
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free(prev_seg->data);
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prev_seg->data = new_data;
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prev_seg->length = new_length;
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last_end = this_end;
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phdr++;
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continue;
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}
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}
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fprintf(stderr, "Warning: segment does not begin on a block boundary, will pad\n");
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memmove(data + block_offset, data, filesz);
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memset(data, 0xFF, block_offset);
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filesz += block_offset;
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paddr -= block_offset;
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}
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seg->data = data;
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seg->start = paddr;
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seg->length = filesz;
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seg++;
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ctx->num_segs++;
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last_end = paddr + filesz;
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phdr++;
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}
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return 0;
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}
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// Sanity check segments and check for bootloader writes
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static int check_segs(flash_file_t *ctx, int can_write_bl) {
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for (int i = 0; i < ctx->num_segs; i++) {
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flash_seg_t *seg = &ctx->segments[i];
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if (seg->start & (BLOCK_SIZE-1)) {
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fprintf(stderr, "Error: Segment is not aligned\n");
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return -1;
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}
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if (seg->start < FLASH_START) {
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fprintf(stderr, "Error: Segment is outside of flash bounds\n");
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return -1;
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}
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if (seg->start + seg->length > FLASH_END) {
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fprintf(stderr, "Error: Segment is outside of flash bounds\n");
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return -1;
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}
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if (!can_write_bl && seg->start < BOOTLOADER_END) {
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fprintf(stderr, "Attempted to write bootloader but bootloader writes are not enabled\n");
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return -1;
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}
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}
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return 0;
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}
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// Load an ELF file and prepare it for flashing
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int flash_load(flash_file_t *ctx, const char *name, int can_write_bl)
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{
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FILE *fd = NULL;
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Elf32_Ehdr ehdr;
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Elf32_Phdr *phdrs = NULL;
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int num_phdrs;
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int res;
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fd = fopen(name, "rb");
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if (!fd) {
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fprintf(stderr, "Could not open file '%s': ", name);
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perror(NULL);
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goto fail;
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}
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fprintf(stderr, "Loading ELF file '%s'...\n", name);
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if (fread(&ehdr, sizeof(ehdr), 1, fd) != 1) {
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fprintf(stderr, "Error while reading ELF file header\n");
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goto fail;
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}
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if (memcmp(ehdr.e_ident, elf_ident, sizeof(elf_ident))
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|| le32(ehdr.e_version) != 1)
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{
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fprintf(stderr, "Not an ELF file or wrong ELF type\n");
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goto fail;
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}
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if (le16(ehdr.e_type) != ET_EXEC) {
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fprintf(stderr, "ELF is not executable\n");
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goto fail;
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}
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if (le16(ehdr.e_machine) != EM_ARM) {
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fprintf(stderr, "Wrong ELF architecture\n");
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goto fail;
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}
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if (!ehdr.e_phnum || !ehdr.e_phoff) {
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fprintf(stderr, "ELF has no PHDRs\n");
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goto fail;
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}
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if (le16(ehdr.e_phentsize) != sizeof(Elf32_Phdr)) {
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// could be a structure padding issue...
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fprintf(stderr, "Either the ELF file or this code is made of fail\n");
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goto fail;
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}
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num_phdrs = le16(ehdr.e_phnum);
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phdrs = malloc(le16(ehdr.e_phnum) * sizeof(Elf32_Phdr));
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if (!phdrs) {
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fprintf(stderr, "Out of memory\n");
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goto fail;
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}
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if (fseek(fd, le32(ehdr.e_phoff), SEEK_SET) < 0) {
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fprintf(stderr, "Error while reading ELF PHDRs\n");
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goto fail;
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}
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if (fread(phdrs, sizeof(Elf32_Phdr), num_phdrs, fd) != num_phdrs) {
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fprintf(stderr, "Error while reading ELF PHDRs\n");
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goto fail;
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}
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res = build_segs_from_phdrs(ctx, fd, phdrs, num_phdrs);
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if (res < 0)
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goto fail;
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res = check_segs(ctx, can_write_bl);
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if (res < 0)
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goto fail;
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free(phdrs);
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fclose(fd);
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ctx->filename = name;
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return 0;
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fail:
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if (phdrs)
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free(phdrs);
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if (fd)
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fclose(fd);
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flash_free(ctx);
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return -1;
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}
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// Get the state of the proxmark, backwards compatible
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static int get_proxmark_state(uint32_t *state)
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{
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UsbCommand c;
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c.cmd = CMD_DEVICE_INFO;
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SendCommand(&c);
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UsbCommand resp;
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ReceiveCommand(&resp);
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// Three outcomes:
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// 1. The old bootrom code will ignore CMD_DEVICE_INFO, but respond with an ACK
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// 2. The old os code will respond with CMD_DEBUG_PRINT_STRING and "unknown command"
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// 3. The new bootrom and os codes will respond with CMD_DEVICE_INFO and flags
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switch (resp.cmd) {
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case CMD_ACK:
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*state = DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM;
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break;
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case CMD_DEBUG_PRINT_STRING:
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*state = DEVICE_INFO_FLAG_CURRENT_MODE_OS;
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break;
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case CMD_DEVICE_INFO:
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*state = resp.arg[0];
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break;
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default:
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fprintf(stderr, "Error: Couldn't get proxmark state, bad response type: 0x%04"llx"\n", resp.cmd);
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return -1;
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break;
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}
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return 0;
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}
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// Enter the bootloader to be able to start flashing
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static int enter_bootloader(char *serial_port_name)
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{
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uint32_t state;
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if (get_proxmark_state(&state) < 0)
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return -1;
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if (state & DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM) {
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/* Already in flash state, we're done. */
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return 0;
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}
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if (state & DEVICE_INFO_FLAG_CURRENT_MODE_OS) {
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fprintf(stderr,"Entering bootloader...\n");
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UsbCommand c;
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memset(&c, 0, sizeof (c));
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if ((state & DEVICE_INFO_FLAG_BOOTROM_PRESENT)
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&& (state & DEVICE_INFO_FLAG_OSIMAGE_PRESENT))
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{
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// New style handover: Send CMD_START_FLASH, which will reset the board
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// and enter the bootrom on the next boot.
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c.cmd = CMD_START_FLASH;
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SendCommand(&c);
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fprintf(stderr,"(Press and release the button only to abort)\n");
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} else {
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// Old style handover: Ask the user to press the button, then reset the board
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c.cmd = CMD_HARDWARE_RESET;
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SendCommand(&c);
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fprintf(stderr,"Press and hold down button NOW if your bootloader requires it.\n");
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}
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msleep(100);
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CloseProxmark();
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fprintf(stderr,"Waiting for Proxmark to reappear on %s",serial_port_name);
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do {
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sleep(1);
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fprintf(stderr, ".");
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} while (!OpenProxmark(0));
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fprintf(stderr," Found.\n");
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return 0;
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}
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fprintf(stderr, "Error: Unknown Proxmark mode\n");
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return -1;
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}
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static int wait_for_ack(void)
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{
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UsbCommand ack;
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ReceiveCommand(&ack);
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if (ack.cmd != CMD_ACK) {
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printf("Error: Unexpected reply 0x%04"llx" (expected ACK)\n", ack.cmd);
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return -1;
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}
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return 0;
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}
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// Go into flashing mode
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int flash_start_flashing(int enable_bl_writes,char *serial_port_name)
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{
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uint32_t state;
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if (enter_bootloader(serial_port_name) < 0)
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return -1;
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if (get_proxmark_state(&state) < 0)
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return -1;
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if (state & DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH) {
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// This command is stupid. Why the heck does it care which area we're
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// flashing, as long as it's not the bootloader area? The mind boggles.
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UsbCommand c = {CMD_START_FLASH};
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if (enable_bl_writes) {
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c.arg[0] = FLASH_START;
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c.arg[1] = FLASH_END;
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c.arg[2] = START_FLASH_MAGIC;
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} else {
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c.arg[0] = BOOTLOADER_END;
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c.arg[1] = FLASH_END;
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c.arg[2] = 0;
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}
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SendCommand(&c);
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return wait_for_ack();
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} else {
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fprintf(stderr, "Note: Your bootloader does not understand the new START_FLASH command\n");
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fprintf(stderr, " It is recommended that you update your bootloader\n\n");
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}
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return 0;
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}
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static int write_block(uint32_t address, uint8_t *data, uint32_t length)
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{
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uint8_t block_buf[BLOCK_SIZE];
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memset(block_buf, 0xFF, BLOCK_SIZE);
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memcpy(block_buf, data, length);
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UsbCommand c;
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c.cmd = CMD_FINISH_WRITE;
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c.arg[0] = address;
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memcpy(c.d.asBytes, block_buf, length);
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SendCommand(&c);
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return wait_for_ack();
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}
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// Write a file's segments to Flash
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int flash_write(flash_file_t *ctx)
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{
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fprintf(stderr, "Writing segments for file: %s\n", ctx->filename);
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for (int i = 0; i < ctx->num_segs; i++) {
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flash_seg_t *seg = &ctx->segments[i];
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uint32_t length = seg->length;
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uint32_t blocks = (length + BLOCK_SIZE - 1) / BLOCK_SIZE;
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uint32_t end = seg->start + length;
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fprintf(stderr, " 0x%08x..0x%08x [0x%x / %d blocks]",
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seg->start, end - 1, length, blocks);
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int block = 0;
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uint8_t *data = seg->data;
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uint32_t baddr = seg->start;
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while (length) {
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uint32_t block_size = length;
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if (block_size > BLOCK_SIZE)
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block_size = BLOCK_SIZE;
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if (write_block(baddr, data, block_size) < 0) {
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fprintf(stderr, " ERROR\n");
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fprintf(stderr, "Error writing block %d of %d\n", block, blocks);
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return -1;
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}
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data += block_size;
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baddr += block_size;
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length -= block_size;
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block++;
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fprintf(stderr, ".");
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}
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fprintf(stderr, " OK\n");
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}
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return 0;
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}
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// free a file context
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void flash_free(flash_file_t *ctx)
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{
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if (!ctx)
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return;
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if (ctx->segments) {
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for (int i = 0; i < ctx->num_segs; i++)
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free(ctx->segments[i].data);
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free(ctx->segments);
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ctx->segments = NULL;
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ctx->num_segs = 0;
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}
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}
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// just reset the unit
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int flash_stop_flashing(void) {
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UsbCommand c = {CMD_HARDWARE_RESET};
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SendCommand(&c);
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msleep(100);
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return 0;
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}
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