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circuitpython/supervisor/shared/safe_mode.c

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/*
* 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/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 current_safe_mode;
safe_mode_t wait_for_safe_mode_reset(void) {
uint32_t reset_state = port_get_saved_word();
safe_mode_t safe_mode = NO_SAFE_MODE;
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 != NO_SAFE_MODE) {
port_set_saved_word(SAFE_MODE_DATA_GUARD);
current_safe_mode = safe_mode;
return safe_mode;
} else {
current_safe_mode = 0;
}
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 NO_SAFE_MODE;
}
#ifdef CIRCUITPY_SKIP_SAFE_MODE_WAIT
return NO_SAFE_MODE;
#endif
port_set_saved_word(SAFE_MODE_DATA_GUARD | (MANUAL_SAFE_MODE << 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 USER_SAFE_MODE;
}
// Restore the original state of the saved word if no reset occured during our wait period.
port_set_saved_word(reset_state);
return NO_SAFE_MODE;
}
void 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,)) reset_into_safe_mode(safe_mode_t reason) {
if (current_safe_mode > BROWNOUT && reason > 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 == NO_SAFE_MODE) {
return;
}
serial_write("\r\n");
serial_write_compressed(translate("You are in safe mode because:\n"));
const compressed_string_t *message = NULL;
// First check for safe mode reasons that do not necessarily reflect bugs.
switch (reason) {
case USER_SAFE_MODE:
#ifdef BOARD_USER_SAFE_MODE_ACTION
message = BOARD_USER_SAFE_MODE_ACTION;
#elif defined(CIRCUITPY_BOOT_BUTTON)
message = translate("pressing boot button at start up.\n");
#endif
if (message != NULL) {
// Output a user safe mode string if it's set.
serial_write_compressed(translate("You requested starting safe mode by "));
serial_write_compressed(message);
serial_write_compressed(translate("To exit, please reset the board without "));
// The final piece is printed below.
}
break;
case MANUAL_SAFE_MODE:
message = translate("You pressed the reset button during boot. Press again to exit safe mode.");
break;
case PROGRAMMATIC_SAFE_MODE:
message = translate("The `microcontroller` module was used to boot into safe mode. Press reset to exit safe mode.");
break;
case BROWNOUT:
message = translate("The microcontroller's power dipped. Make sure your power supply provides\nenough power for the whole circuit and press reset (after ejecting CIRCUITPY).");
break;
case USB_TOO_MANY_ENDPOINTS:
message = translate("USB devices need more endpoints than are available.");
break;
case USB_TOO_MANY_INTERFACE_NAMES:
message = translate("USB devices specify too many interface names.");
break;
case USB_BOOT_DEVICE_NOT_INTERFACE_ZERO:
message = translate("Boot device must be first device (interface #0).");
break;
case WATCHDOG_RESET:
message = translate("Internal watchdog timer expired.");
break;
case NO_CIRCUITPY:
message = translate("CIRCUITPY drive could not be found or created.");
break;
default:
break;
}
if (message) {
serial_write_compressed(message);
serial_write("\r\n");
return;
}
// Something worse happened.
serial_write_compressed(translate("CircuitPython core code crashed hard. Whoops!\n"));
switch (reason) {
case HARD_CRASH:
message = translate("Crash into the HardFault_Handler.");
break;
case MICROPY_NLR_JUMP_FAIL:
message = translate("NLR jump failed. Likely memory corruption.");
break;
case MICROPY_FATAL_ERROR:
message = translate("Fatal error.");
break;
case NO_HEAP:
message = translate("CircuitPython was unable to allocate the heap.");
break;
case HEAP_OVERWRITTEN:
message = translate("The CircuitPython heap was corrupted because the stack was too small.\nIncrease the stack size if you know how. If not:");
break;
case GC_ALLOC_OUTSIDE_VM:
message = translate("Attempted heap allocation when VM not running.");
break;
#ifdef SOFTDEVICE_PRESENT
// defined in ports/nrf/bluetooth/bluetooth_common.mk
// will print "Unknown reason" if somehow encountered on other ports
case NORDIC_SOFT_DEVICE_ASSERT:
message = translate("Nordic system firmware failure assertion.");
break;
#endif
case FLASH_WRITE_FAIL:
message = translate("Failed to write internal flash.");
break;
case MEM_MANAGE:
message = translate("Invalid memory access.");
break;
default:
message = translate("Unknown reason.");
break;
}
serial_write_compressed(message);
serial_write_compressed(translate("\nPlease file an issue with the contents of your CIRCUITPY drive at \nhttps://github.com/adafruit/circuitpython/issues\n"));
}
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