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trezor-firmware/legacy/util.h

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/*
* This file is part of the Trezor project, https://trezor.io/
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*
* 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 <setup.h>
#include <stdbool.h>
#include <stdint.h>
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#if !EMULATOR
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#include <libopencm3/cm3/scb.h>
#include <libopencm3/cm3/vector.h>
#include "timer.h"
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#endif
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// Statement expressions make these macros side-effect safe
#define MIN_8bits(a, b) \
({ \
typeof(a) _a = (a); \
typeof(b) _b = (b); \
_a < _b ? (_a & 0xFF) : (_b & 0xFF); \
})
#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; \
})
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void delay(uint32_t wait);
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// converts uint32 to hexa (8 digits)
void uint32hex(uint32_t num, char *str);
// converts data to hexa
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void data2hex(const uint8_t *data, uint32_t len, char *str);
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// defined in startup.s (or setup.c for emulator)
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extern void __attribute__((noreturn)) shutdown(void);
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#if !EMULATOR
// defined in memory.ld
extern uint8_t _ram_start[], _ram_end[];
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// defined in startup.s
extern void memset_reg(void *start, void *stop, uint32_t val);
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#define FW_SIGNED 0x5A3CA5C3
#define FW_UNTRUSTED 0x00000000
static inline void __attribute__((noreturn))
jump_to_firmware(const vector_table_t *ivt, int trust) {
if (FW_SIGNED == trust) { // trusted signed firmware
SCB_VTOR = (uint32_t)ivt; // * relocate vector table
// Set stack pointer
__asm__ volatile("msr msp, %0" ::"r"(ivt->initial_sp_value));
} else { // untrusted firmware
timer_init();
mpu_config_firmware(); // * configure MPU for the firmware
// Setup stack in unprivileged mode (MSR works only for privileged)
// This syntax will use _stack as immediate value to put into SP
// instead of dereferencing it
__asm__ volatile("mov sp, %[input]" ::[input] "r"(&_stack));
}
// Jump to address
ivt->reset();
// Prevent compiler from generating stack protector code (which causes CPU
// fault because the stack is moved)
for (;;)
;
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}
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));
}
static inline bool is_mode_unprivileged(void) {
uint32_t r0;
__asm__ volatile("mrs %0, control" : "=r"(r0));
return r0 & 1;
}
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#else /* EMULATOR */
static inline bool is_mode_unprivileged(void) { return true; }
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#endif
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#endif