source: trunk/kernel/kern/do_exception.h @ 16

Last change on this file since 16 was 16, checked in by alain, 5 years ago

mprove the HAL for interrupt, exception, syscall handling.

File size: 3.5 KB
Line 
1/*
2 * do_exception.h - Architecture independant exception handler definition.
3 *
4 * Author    Ghassan Almaless (2008,2009,2010,2011,2012)
5 *           Mohamed Lamine Karaoui (2015)
6 *           Alain Greiner (2016)
7 *
8 * Copyright (c) UPMC Sorbonne Universites
9 *
10 * This file is part of ALMOS-MKH.
11 *
12 * ALMOS-MKH is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; version 2.0 of the License.
15 *
16 * ALMOS-MKH is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
23 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#ifndef _DO_EXCEPTION_H_
27#define _DO_EXCEPTION_H_
28
29#include <hal_types.h>
30#include <thread.h>
31
32///////////////////////////////////////////////////////////////////////////////////////
33// This file defines the architecture independant exception handler.
34///////////////////////////////////////////////////////////////////////////////////////
35
36/**************************************************************************************
37 * This enum defines the various error codes returned by this generic
38 * exception handler to the architecture specific exception handler.
39 *************************************************************************************/
40
41typedef enum
42{
43        EXCP_NON_FATAL     = 0,   // page fault of FPU unusable handled => non fatal
44        EXCP_USER_ERROR    = 1,   // User error => user process will receive a SIGSEGV
45    EXCP_KERNEL_PANIC  = 2,   // Kernel error => kernel panic
46}
47excp_classes_t;
48
49/**************************************************************************************
50 * This defines the masks used to analyse the MMU exception code
51 * TODO : these values have been defined to fit the TSAR MMU,
52 * but a more generic abstraction must be defined...
53 *************************************************************************************/
54
55#define    MMU_EXCP_PAGE_UNMAPPED   0x0003    // page fault (PTE unmapped)
56#define    MMU_EXCP_USER_PRIVILEGE  0x0004    // user access to a kernel segment
57#define    MMU_EXCP_USER_WRITE      0x0008    // user access to non writable segment
58#define    MMU_EXCP_USER_EXEC       0x0010    // user access to non executable segment
59
60/**************************************************************************************
61 * This function is called by the hal_do_exception() function associated to a specific
62 * hardware architecture.
63 * The fatal errors are mostly handled by the architecture specific handler,
64 * and this generic handler handles only two non fatal exceptions types:
65 * - MMU page fault
66 * - FPU unavailable
67 * As some MMU exceptions can be fatal, the returned error code can take three values:
68 * - Non Fatal Exception
69 * - Fatal User Error
70 * - Kernel Panic Error
71 **************************************************************************************
72 * @ this      : pointer on the faulty (user) thread descriptor.
73 * @ is_mmu    : MMU exception if true / FPU exception if false
74 * @ return an error code in [EXCP_NON_FATAL / EXCP_USER_ERROR / EXCP_KERNEL_PANIC]
75 *************************************************************************************/
76error_t do_exception( thread_t * this,
77                      bool_t     is_mmu );
78
79#endif  /* _DO_EXCEPTION_H_ */
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