| 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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