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trezor-firmware/util.h
Jochen Hoenicke be64864efc
Put persistent variables at end of stack
Two variables of the bootloader are persistent:
- __stack_chk_guard is used by interrupt handlers
- system_millis is used by timer interrupt and service routines

Note that currently __stack_chk_guard is shared between unprivileged
firmware and bootloader.

If we get more variables later it may make sense to make a section for
this.
2018-03-29 01:30:40 +02:00

85 lines
2.6 KiB
C

/*
* This file is part of the TREZOR project, https://trezor.io/
*
* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.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/>.
*/
#ifndef __UTIL_H_
#define __UTIL_H_
#include <stdint.h>
#include <setup.h>
#if !EMULATOR
#include <libopencm3/cm3/scb.h>
#include <libopencm3/cm3/vector.h>
#endif
// Statement expressions make these macros side-effect safe
#define MIN(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b); _a < _b ? _a : _b; })
#define MAX(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b); _a > _b ? _a : _b; })
void delay(uint32_t wait);
// converts uint32 to hexa (8 digits)
void uint32hex(uint32_t num, char *str);
// converts data to hexa
void data2hex(const void *data, uint32_t len, char *str);
// read protobuf integer and advance pointer
uint32_t readprotobufint(uint8_t **ptr);
extern void __attribute__((noreturn)) shutdown(void);
#if !EMULATOR
// defined in memory.ld
extern uint8_t _ram_start[], _ram_end[];
extern uint8_t _stack[];
// defined in startup.s
extern void memset_reg(void *start, void *stop, uint32_t val);
#define FW_SIGNED 0x5A3CA5C3
#define FW_UNTRUSTED 0x00000000
static inline void __attribute__((noreturn)) jump_to_firmware(const vector_table_t *vector_table, int trust)
{
if (FW_SIGNED == trust) { // trusted signed firmware
SCB_VTOR = (uint32_t)vector_table; // * relocate vector table
// Set stack pointer
__asm__ volatile("msr msp, %0" :: "r" (vector_table->initial_sp_value));
} else { // untrusted firmware
mpu_config(); // * configure MPU
__asm__ volatile("msr msp, %0" :: "r" (_stack));
}
// Jump to address
vector_table->reset();
// Prevent compiler from generating stack protector code (which causes CPU fault because the stack is moved)
for (;;);
}
static inline void set_mode_unprivileged(void)
{
// http://infocenter.arm.com/help/topic/com.arm.doc.dui0552a/CHDBIBGJ.html
__asm__ volatile("msr control, %0" :: "r" (0x1));
}
#endif
#endif