| 1 | /* |
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| 2 | * hal_do_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_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 fault" or "FPU unusable" are non fatal. |
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| 35 | // The calling thread resumes execution when the exception has been handled. |
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| 36 | // |
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| 37 | // - USER_ERROR : these exceptions such a "illegal vaddr" or "illegal write access" |
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| 38 | // are fatal. The calling thread process is killed, after an "error" message on the |
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| 39 | // kernel terminal. |
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| 40 | // |
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| 41 | // - KERNEL_PANIC : events such as "no memory" or "kernel mistakes" are considered |
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| 42 | // abnormal events. The calling core goes to sleep, after a "panic" message |
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| 43 | // on the kernel terminal. |
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| 44 | // |
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| 45 | // For all exceptions, the faulty core context has been saved in a registers |
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| 46 | // array stored in the user thread descriptor (core in user mode), and in the |
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| 47 | // kernel stack (core in kernel mode). |
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| 48 | // |
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| 49 | // Any architecture specific implementation must implement this API. |
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| 50 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 51 | |
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| 52 | /**** forward declaration ****/ |
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| 53 | |
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| 54 | struct thread_s; |
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| 55 | |
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| 56 | /***************************************************************************************** |
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| 57 | * This function implements the ALMOS-MKH exception handler. |
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| 58 | * It is called by the hal_kentry function when an exception is detected |
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| 59 | * by the hardware for an user thread running on a given core. |
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| 60 | ***************************************************************************************** |
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| 61 | * @ this : pointer on the faulty thread descriptor. |
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| 62 | * @ regs_tbl : array containing the core registers values saved by hal_kentry. |
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| 63 | ****************************************************************************************/ |
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| 64 | void hal_do_exception( struct thread_s * this, |
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| 65 | reg_t * regs_tbl ); |
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| 66 | |
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| 67 | /***************************************************************************************** |
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| 68 | * This function prints on the kernel terminal the saved context (core registers) |
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| 69 | * and the thread state of a faulty thread. |
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| 70 | ***************************************************************************************** |
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| 71 | * @ this : pointer on the faulty thread descriptor. |
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| 72 | * @ regs_tbl : pointer on the array containing the core registers values. |
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| 73 | ****************************************************************************************/ |
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| 74 | void hal_exception_dump( struct thread_s * this, |
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| 75 | reg_t * regs_tbl ); |
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| 76 | |
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| 77 | #endif // _HAL_EXCEPTION_H_ |
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