| 1 | /* |
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| 2 | * hal_exception.c - Architecture specific exception handler API definition |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2016,2017) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #ifndef _HAL_EXCEPTION_H_ |
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| 25 | #define _HAL_EXCEPTION_H_ |
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| 26 | |
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| 27 | #include <hal_kernel_types.h> |
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| 28 | |
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| 29 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 30 | // Architecture specific exception handler API |
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| 31 | // |
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| 32 | // ALMOS-MKH defines three classes of exceptions: |
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| 33 | // |
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| 34 | // - NON_FATAL : exceptions such as "page unmapped" or "FPU unusable" can be non fatal. |
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| 35 | // => The hal_do_exception() function call the generic vmm_handle_page_fault(), |
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| 36 | // or the fpu_handle_exception() function, and the calling thread resumes execution |
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| 37 | // when the exception has been handled. |
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| 38 | // |
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| 39 | // - USER_ERROR : exceptions such a "illegal vaddr" or "illegal write access" are fatal. |
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| 40 | // => The hal_do_exception() function send a kill signal to the calling thread process, |
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| 41 | // and displays an error message on TXT0. |
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| 42 | // |
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| 43 | // - KERNEL_PANIC : "kernel mistakes" are abnormal events. |
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| 44 | // => The hal_do_exception() function calls the generic panic() function, to display |
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| 45 | // a message on TXT0, disable IRQs and call the hal_core_sleep() function. |
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| 46 | // |
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| 47 | // For all exceptions, the faulty core registers have been saved in the "uzone" |
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| 48 | // that can be accessed through the "uzone" pointer stored in thread descriptor. |
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| 49 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 50 | |
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| 51 | |
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| 52 | /***************************************************************************************** |
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| 53 | * This function is called by the hal_kentry() function when an exception is detected by |
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| 54 | * the hardware for a given thread running on a given core. |
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| 55 | ****************************************************************************************/ |
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| 56 | void hal_do_exception( void ); |
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| 57 | |
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| 58 | #endif // _HAL_EXCEPTION_H_ |
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