69 lines
3.0 KiB
C
69 lines
3.0 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 Glenn Ruben Bakke
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* Copyright (c) 2018 Artur Pacholec
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/mphal.h"
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#include "supervisor/cpu.h"
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#if defined(CONFIG_IDF_TARGET_ESP32)
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#include "components/esp_rom/include/esp32/rom/ets_sys.h"
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#elif defined(CONFIG_IDF_TARGET_ESP32C3)
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#include "components/esp_rom/include/esp32c3/rom/ets_sys.h"
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#elif defined(CONFIG_IDF_TARGET_ESP32S2)
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#include "components/esp_rom/include/esp32s2/rom/ets_sys.h"
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#elif defined(CONFIG_IDF_TARGET_ESP32S3)
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#include "components/esp_rom/include/esp32s3/rom/ets_sys.h"
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#endif
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void mp_hal_delay_us(mp_uint_t delay) {
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ets_delay_us(delay);
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}
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// This is provided by the esp-idf/components/xtensa/esp32s2/libhal.a binary blob.
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#ifndef CONFIG_IDF_TARGET_ESP32C3
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extern void xthal_window_spill(void);
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#endif
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mp_uint_t cpu_get_regs_and_sp(mp_uint_t *regs) {
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// xtensa has more registers than an instruction can address. The 16 that
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// can be addressed are called the "window". When a function is called or
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// returns the window rotates. This allows for more efficient function calls
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// because ram doesn't need to be used. It's only used if the window wraps
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// around onto itself. At that point values are "spilled" to empty spots in
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// the stack that were set aside. When the window rotates back around (on
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// function return), the values are restored into the register from ram.
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// So, in order to read the values in the stack scan we must make sure all
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// of the register values we care about have been spilled to RAM. Luckily,
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// there is a HAL call to do it. There is a bit of a race condition here
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// because the register value could change after it's been restored but that
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// is unlikely to happen with a heap pointer while we do a GC.
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#ifndef CONFIG_IDF_TARGET_ESP32C3
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xthal_window_spill();
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#endif
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return (mp_uint_t)__builtin_frame_address(0);
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}
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