/* * This file is part of the MicroPython project, http://micropython.org/ * * The MIT License (MIT) * * Copyright (c) 2018 Scott Shawcroft for Adafruit Industries * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "supervisor/shared/safe_mode.h" #include "mphalport.h" #if defined(CIRCUITPY_BOOT_BUTTON) #include "shared-bindings/digitalio/DigitalInOut.h" #endif #include "shared-bindings/microcontroller/Processor.h" #include "shared-bindings/microcontroller/ResetReason.h" #include "supervisor/linker.h" #include "supervisor/serial.h" #include "supervisor/shared/rgb_led_colors.h" #include "supervisor/shared/status_leds.h" #include "supervisor/shared/translate/translate.h" #include "supervisor/shared/tick.h" #define SAFE_MODE_DATA_GUARD 0xad0000af #define SAFE_MODE_DATA_GUARD_MASK 0xff0000ff static safe_mode_t _safe_mode; safe_mode_t get_safe_mode(void) { return _safe_mode; } void set_safe_mode(safe_mode_t safe_mode) { _safe_mode = safe_mode; } safe_mode_t wait_for_safe_mode_reset(void) { uint32_t reset_state = port_get_saved_word(); safe_mode_t safe_mode = SAFE_MODE_NONE; if ((reset_state & SAFE_MODE_DATA_GUARD_MASK) == SAFE_MODE_DATA_GUARD) { safe_mode = (reset_state & ~SAFE_MODE_DATA_GUARD_MASK) >> 8; } if (safe_mode != SAFE_MODE_NONE) { port_set_saved_word(SAFE_MODE_DATA_GUARD); _safe_mode = safe_mode; return safe_mode; } else { _safe_mode = SAFE_MODE_NONE; } const mcu_reset_reason_t reset_reason = common_hal_mcu_processor_get_reset_reason(); if (reset_reason != RESET_REASON_POWER_ON && reset_reason != RESET_REASON_RESET_PIN && reset_reason != RESET_REASON_UNKNOWN && reset_reason != RESET_REASON_SOFTWARE) { return SAFE_MODE_NONE; } #if CIRCUITPY_SKIP_SAFE_MODE_WAIT return SAFE_MODE_NONE; #endif port_set_saved_word(SAFE_MODE_DATA_GUARD | (SAFE_MODE_USER << 8)); // Wait for a while to allow for reset. #if CIRCUITPY_STATUS_LED status_led_init(); #endif #ifdef CIRCUITPY_BOOT_BUTTON digitalio_digitalinout_obj_t boot_button; common_hal_digitalio_digitalinout_construct(&boot_button, CIRCUITPY_BOOT_BUTTON); common_hal_digitalio_digitalinout_switch_to_input(&boot_button, PULL_UP); #endif uint64_t start_ticks = supervisor_ticks_ms64(); uint64_t diff = 0; bool boot_in_safe_mode = false; while (diff < 1000) { #ifdef CIRCUITPY_STATUS_LED // Blink on for 100, off for 100 bool led_on = (diff % 250) < 125; if (led_on) { new_status_color(SAFE_MODE); } else { new_status_color(BLACK); } #endif #ifdef CIRCUITPY_BOOT_BUTTON if (!common_hal_digitalio_digitalinout_get_value(&boot_button)) { boot_in_safe_mode = true; break; } #endif diff = supervisor_ticks_ms64() - start_ticks; } #if CIRCUITPY_STATUS_LED new_status_color(BLACK); status_led_deinit(); #endif if (boot_in_safe_mode) { return SAFE_MODE_USER; } // Restore the original state of the saved word if no reset occurred during our wait period. port_set_saved_word(reset_state); return SAFE_MODE_NONE; } void PLACE_IN_ITCM(safe_mode_on_next_reset)(safe_mode_t reason) { port_set_saved_word(SAFE_MODE_DATA_GUARD | (reason << 8)); } // Don't inline this so it's easy to break on it from GDB. void __attribute__((noinline, )) PLACE_IN_ITCM(reset_into_safe_mode)(safe_mode_t reason) { if (_safe_mode > SAFE_MODE_BROWNOUT && reason > SAFE_MODE_BROWNOUT) { while (true) { // This very bad because it means running in safe mode didn't save us. Only ignore brownout // because it may be due to a switch bouncing. } } safe_mode_on_next_reset(reason); reset_cpu(); } void print_safe_mode_message(safe_mode_t reason) { if (reason == SAFE_MODE_NONE) { return; } serial_write_compressed(MP_ERROR_TEXT("\nYou are in safe mode because:\n")); mp_rom_error_text_t message = NULL; // First check for safe mode reasons that do not necessarily reflect bugs. switch (reason) { case SAFE_MODE_BROWNOUT: message = MP_ERROR_TEXT("Power dipped. Make sure you are providing enough power."); break; case SAFE_MODE_USER: #if defined(BOARD_USER_SAFE_MODE_ACTION) message = BOARD_USER_SAFE_MODE_ACTION; #elif defined(CIRCUITPY_BOOT_BUTTON) message = MP_ERROR_TEXT("You pressed the BOOT button at start up"); #else message = MP_ERROR_TEXT("You pressed the reset button during boot."); #endif break; case SAFE_MODE_NO_CIRCUITPY: message = MP_ERROR_TEXT("CIRCUITPY drive could not be found or created."); break; case SAFE_MODE_PROGRAMMATIC: message = MP_ERROR_TEXT("The `microcontroller` module was used to boot into safe mode."); break; #if CIRCUITPY_SAFEMODE_PY case SAFE_MODE_SAFEMODE_PY_ERROR: message = MP_ERROR_TEXT("Error in safemode.py."); break; #endif case SAFE_MODE_STACK_OVERFLOW: message = MP_ERROR_TEXT("Heap was corrupted because the stack was too small. Increase stack size."); break; case SAFE_MODE_USB_TOO_MANY_ENDPOINTS: message = MP_ERROR_TEXT("USB devices need more endpoints than are available."); break; case SAFE_MODE_USB_TOO_MANY_INTERFACE_NAMES: message = MP_ERROR_TEXT("USB devices specify too many interface names."); break; case SAFE_MODE_USB_BOOT_DEVICE_NOT_INTERFACE_ZERO: message = MP_ERROR_TEXT("Boot device must be first (interface #0)."); break; case SAFE_MODE_WATCHDOG: message = MP_ERROR_TEXT("Internal watchdog timer expired."); break; default: break; } if (message) { // Non-crash safe mode. serial_write_compressed(message); } else { // Something worse happened. serial_write_compressed(MP_ERROR_TEXT("CircuitPython core code crashed hard. Whoops!\n")); switch (reason) { case SAFE_MODE_GC_ALLOC_OUTSIDE_VM: message = MP_ERROR_TEXT("Heap allocation when VM not running."); break; case SAFE_MODE_FLASH_WRITE_FAIL: message = MP_ERROR_TEXT("Failed to write internal flash."); break; case SAFE_MODE_HARD_FAULT: message = MP_ERROR_TEXT("Hard fault: memory access or instruction error."); break; case SAFE_MODE_INTERRUPT_ERROR: message = MP_ERROR_TEXT("Interrupt error."); break; case SAFE_MODE_NLR_JUMP_FAIL: message = MP_ERROR_TEXT("NLR jump failed. Likely memory corruption."); break; case SAFE_MODE_NO_HEAP: message = MP_ERROR_TEXT("Unable to allocate to the heap."); break; case SAFE_MODE_SDK_FATAL_ERROR: message = MP_ERROR_TEXT("Third-party firmware fatal error."); break; default: message = MP_ERROR_TEXT("Unknown reason."); break; } serial_write_compressed(message); serial_write_compressed(MP_ERROR_TEXT("\nPlease file an issue with your program at github.com/adafruit/circuitpython/issues.")); } // Always tell user how to get out of safe mode. serial_write_compressed(MP_ERROR_TEXT("\nPress reset to exit safe mode.\n")); }