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trezor-firmware/legacy/emulator/setup.c

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/*
* This file is part of the Trezor project, https://trezor.io/
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*
* Copyright (C) 2017 Saleem Rashid <trezor@saleemrashid.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <libopencm3/stm32/flash.h>
#include "memory.h"
#include "oled.h"
#include "rng.h"
#include "setup.h"
#include "timer.h"
#define EMULATOR_FLASH_FILE "emulator.img"
uint8_t *emulator_flash_base = NULL;
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uint32_t __stack_chk_guard;
static void setup_flash(void);
void setup(void) { setup_flash(); }
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void __attribute__((noreturn)) shutdown(void) {
sleep(5);
exit(4);
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}
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static void setup_flash(void) {
int fd = open(EMULATOR_FLASH_FILE, O_RDWR | O_SYNC | O_CREAT, 0644);
if (fd < 0) {
perror("Failed to open flash emulation file");
exit(1);
}
off_t length = lseek(fd, 0, SEEK_END);
if (length < 0) {
perror("Failed to read length of flash emulation file");
exit(1);
}
emulator_flash_base =
mmap(NULL, FLASH_TOTAL_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (emulator_flash_base == MAP_FAILED) {
perror("Failed to map flash emulation file");
exit(1);
}
if (length < FLASH_TOTAL_SIZE) {
if (ftruncate(fd, FLASH_TOTAL_SIZE) != 0) {
perror("Failed to initialize flash emulation file");
exit(1);
}
/* Initialize the flash */
flash_erase_all_sectors(FLASH_CR_PROGRAM_X32);
}
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}