mirror of
https://github.com/trezor/trezor-firmware.git
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100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* This file is part of the TREZOR project, https://trezor.io/
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*
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* Copyright (C) 2014 Pavol Rusnak <stick@satoshilabs.com>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __UTIL_H_
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#define __UTIL_H_
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#include <stdint.h>
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#include <stdbool.h>
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#include <setup.h>
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#if !EMULATOR
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#include <libopencm3/cm3/scb.h>
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#include <libopencm3/cm3/vector.h>
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#endif
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// Statement expressions make these macros side-effect safe
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#define MIN(a, b) ({ typeof(a) _a = (a); typeof(b) _b = (b); _a < _b ? _a : _b; })
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#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)
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void uint32hex(uint32_t num, char *str);
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// converts data to hexa
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void data2hex(const void *data, uint32_t len, char *str);
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// read protobuf integer and advance pointer
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uint32_t readprotobufint(uint8_t **ptr);
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extern void __attribute__((noreturn)) shutdown(void);
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#if !EMULATOR
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// defined in memory.ld
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extern uint8_t _ram_start[], _ram_end[];
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extern uint8_t _stack[];
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// defined in startup.s
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extern void memset_reg(void *start, void *stop, uint32_t val);
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#define FW_SIGNED 0x5A3CA5C3
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#define FW_UNTRUSTED 0x00000000
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static inline void __attribute__((noreturn)) jump_to_firmware(const vector_table_t *vector_table, int trust)
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{
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if (FW_SIGNED == trust) { // trusted signed firmware
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SCB_VTOR = (uint32_t)vector_table; // * relocate vector table
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// Set stack pointer
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__asm__ volatile("msr msp, %0" :: "r" (vector_table->initial_sp_value));
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} else { // untrusted firmware
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mpu_config(); // * configure MPU
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__asm__ volatile("msr msp, %0" :: "r" (_stack));
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}
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// Jump to address
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vector_table->reset();
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// Prevent compiler from generating stack protector code (which causes CPU fault because the stack is moved)
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for (;;);
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}
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static inline void set_mode_unprivileged(void)
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{
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// http://infocenter.arm.com/help/topic/com.arm.doc.dui0552a/CHDBIBGJ.html
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__asm__ volatile("msr control, %0" :: "r" (0x1));
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}
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static inline bool is_mode_unprivileged(void)
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{
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uint32_t r0;
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__asm__ volatile("mrs %0, control" : "=r" (r0));
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return r0 & 1;
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}
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#else /* EMULATOR */
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static inline bool is_mode_unprivileged(void)
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{
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return true;
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}
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#endif
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#endif
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