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204d2c93a7
Remove nonos-sdk-v2.2.0-28-g89920dc aka 3v0, since we have a real v3 Remove 3.0.0...3.0.4 to reduce overhead in maintaining a bunch or binary patches Update our docs and menu opts to mention 'experimental' status Old versions still remains in git history, so anyone wanting to play around with 3.0.x could still make use of that work
116 lines
4.3 KiB
C++
116 lines
4.3 KiB
C++
/*
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* Adaptation of _xtos_set_exception_handler for Arduino ESP8266 core
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*
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* This replacement for the Boot ROM `_xtos_set_exception_handler` is used to
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* install our replacement `_xtos_c_wrapper_handler`. This change protects the
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* value of `excvaddr` from corruption.
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*
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*
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* Details
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*
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* The issue, the Boot ROM "C" wrapper for exception handlers,
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* `_xtos_c_wrapper_handler`, turns interrupts back on. This leaves `excvaddr`
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* exposed to possible overwrite before it is read. For example, if an interrupt
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* is taken during the exception handler processing and the ISR handler
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* generates a new exception, the original value of `excvaddr` is lost. To
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* address this issue we have a replacement `_xtos_c_wrapper_handler` in file
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* `exc-c-wrapper-handler.S`.
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*
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* An overview, of an exception at entry: New interrupts are blocked by EXCM
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* being set. Once cleared, interrupts above the current INTLEVEL and exceptions
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* (w/o creating a DoubleException) can occur.
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*
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* Using our replacement for `_xtos_c_wrapper_handler`, INTLEVEL is raised to 15
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* with EXCM cleared.
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*
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* The original Boot ROM `_xtos_c_wrapper_handler` at entry would set INTLEVEL
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* to 3 with EXCM cleared, save registers, then do a `rsil 0` (interrupts fully
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* enabled!) just before calling the registered "C" Exception handler. Our
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* replacement keeps INTLEVEL at 15. This is needed to support the Arduino model
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* of interrupts disabled while an ISR runs.
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*
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* And we also need it for umm_malloc to work safely with an IRAM heap from an
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* ISR call. While malloc() will supply DRAM for all allocation from an ISR, we
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* want free() to safely operate from an ISR to avoid a leak potential.
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*
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* If an exception handler needs interrupts enabled, it would be done after it
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* has consumed the value of `excvaddr`. Whether such action is safe is left to
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* the exception handler writer to determine. However, with our current
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* architecture, I am not convinced it can be done safely.
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*
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*/
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#include <user_interface.h> // need NONOSDK
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#if defined(NON32XFER_HANDLER) || defined(MMU_IRAM_HEAP) || \
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defined(NEW_EXC_C_WRAPPER) || defined(MMU_EXTERNAL_HEAP) || (NONOSDK >= (0x30000))
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/*
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* The original module source code came from:
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* https://github.com/qca/open-ath9k-htc-firmware/blob/master/sboot/magpie_1_1/sboot/athos/src/xtos/exc-sethandler.c
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*
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* It has been revised to use Arduino ESP8266 core includes, types, and
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* formatting.
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*/
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/* exc-sethandler.c - register an exception handler in XTOS */
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/*
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* Copyright (c) 1999-2006 Tensilica Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <Arduino.h>
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#include "esp8266_undocumented.h"
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extern "C" {
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/*
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* Register a C handler for the specified general exception
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* (specified EXCCAUSE value).
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*/
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fn_c_exception_handler_t _xtos_set_exception_handler(int cause, fn_c_exception_handler_t fn)
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{
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fn_c_exception_handler_t ret;
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if( (unsigned) cause >= XCHAL_EXCCAUSE_NUM )
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return 0;
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if( fn == 0 )
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fn = &_xtos_p_none;
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ret = _xtos_c_handler_table[cause];
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_xtos_exc_handler_table[cause] = ( (fn == &_xtos_p_none)
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? &_xtos_unhandled_exception
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: &_xtos_c_wrapper_handler );
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_xtos_c_handler_table[cause] = fn;
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if( ret == &_xtos_p_none )
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ret = 0;
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return ret;
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}
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};
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#endif
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