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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 Copyright (C) 1999 Free Software Foundatio << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 #include "idt.h" 018 #include "idt.h" 020 #include "irq.h" 019 #include "irq.h" 021 020 >> 021 #include <sos/assert.h> 022 #include "exception.h" 022 #include "exception.h" 023 023 024 /* array of exception wrappers, defined in exc 024 /* array of exception wrappers, defined in exception_wrappers.S */ 025 extern sos_vaddr_t sos_exception_wrapper_array 025 extern sos_vaddr_t sos_exception_wrapper_array[SOS_EXCEPT_NUM]; 026 026 027 /* arrays of exception handlers, shared with e 027 /* arrays of exception handlers, shared with exception_wrappers.S */ 028 sos_exception_handler_t sos_exception_handler_ 028 sos_exception_handler_t sos_exception_handler_array[SOS_EXCEPT_NUM] = 029 { NULL, }; 029 { NULL, }; 030 030 >> 031 /* List of exception names for the x86 architecture */ >> 032 static const char * sos_x86_exnames[] = { >> 033 [SOS_EXCEPT_DIVIDE_ERROR] = "Division by zero", >> 034 [SOS_EXCEPT_DEBUG] = "Debug", >> 035 [SOS_EXCEPT_NMI_INTERRUPT] = "Non Maskable Interrupt", >> 036 [SOS_EXCEPT_BREAKPOINT] = "Breakpoint", >> 037 [SOS_EXCEPT_OVERFLOW] = "Overflow", >> 038 [SOS_EXCEPT_BOUND_RANGE_EXCEDEED] = "Bound Range Exceeded", >> 039 [SOS_EXCEPT_INVALID_OPCODE] = "Invalid Opcode", >> 040 [SOS_EXCEPT_DEVICE_NOT_AVAILABLE] = "Device Unavailable", >> 041 [SOS_EXCEPT_DOUBLE_FAULT] = "Double Fault", >> 042 [SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN] = "Coprocessor Segment Overrun", >> 043 [SOS_EXCEPT_INVALID_TSS] = "Invalid TSS", >> 044 [SOS_EXCEPT_SEGMENT_NOT_PRESENT] = "Segment Not Present", >> 045 [SOS_EXCEPT_STACK_SEGMENT_FAULT] = "Stack Segfault", >> 046 [SOS_EXCEPT_GENERAL_PROTECTION] = "General Protection", >> 047 [SOS_EXCEPT_PAGE_FAULT] = "Page Fault", >> 048 [SOS_EXCEPT_INTEL_RESERVED_1] = "INTEL1", >> 049 [SOS_EXCEPT_FLOATING_POINT_ERROR] = "FP Error", >> 050 [SOS_EXCEPT_ALIGNEMENT_CHECK] = "Alignment Check", >> 051 [SOS_EXCEPT_MACHINE_CHECK] = "Machine Check", >> 052 [SOS_EXCEPT_INTEL_RESERVED_2] = "INTEL2", >> 053 [SOS_EXCEPT_INTEL_RESERVED_3] = "INTEL3", >> 054 [SOS_EXCEPT_INTEL_RESERVED_4] = "INTEL4", >> 055 [SOS_EXCEPT_INTEL_RESERVED_5] = "INTEL5", >> 056 [SOS_EXCEPT_INTEL_RESERVED_6] = "INTEL6", >> 057 [SOS_EXCEPT_INTEL_RESERVED_7] = "INTEL7", >> 058 [SOS_EXCEPT_INTEL_RESERVED_8] = "INTEL8", >> 059 [SOS_EXCEPT_INTEL_RESERVED_9] = "INTEL9", >> 060 [SOS_EXCEPT_INTEL_RESERVED_10] = "INTEL10", >> 061 [SOS_EXCEPT_INTEL_RESERVED_11] = "INTEL11", >> 062 [SOS_EXCEPT_INTEL_RESERVED_12] = "INTEL12", >> 063 [SOS_EXCEPT_INTEL_RESERVED_13] = "INTEL13", >> 064 [SOS_EXCEPT_INTEL_RESERVED_14] = "INTEL14" >> 065 }; >> 066 >> 067 >> 068 /* Catch-all exception handler */ >> 069 static void sos_generic_ex(int exid, const struct sos_cpu_state *ctxt) >> 070 { >> 071 const char *exname = sos_exception_get_name(exid); >> 072 >> 073 sos_display_fatal_error("Exception %s in Kernel at instruction 0x%x (info=%x)!\n", >> 074 exname, >> 075 sos_cpu_context_get_PC(ctxt), >> 076 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 077 } >> 078 >> 079 031 sos_ret_t sos_exception_subsystem_setup(void) 080 sos_ret_t sos_exception_subsystem_setup(void) 032 { 081 { >> 082 sos_ret_t retval; >> 083 int exid; >> 084 >> 085 /* Setup the generic exception handler by default for everybody >> 086 except for the double fault exception */ >> 087 for (exid = 0 ; exid < SOS_EXCEPT_NUM ; exid ++) >> 088 { >> 089 /* Skip double fault (see below) */ >> 090 if (exid == SOS_EXCEPT_DOUBLE_FAULT) >> 091 continue; >> 092 >> 093 retval = sos_exception_set_routine(exid, sos_generic_ex); >> 094 if (SOS_OK != retval) >> 095 return retval; >> 096 } >> 097 >> 098 033 /* We inidicate that the double fault except 099 /* We inidicate that the double fault exception handler is defined, 034 and give its address. this handler is a d 100 and give its address. this handler is a do-nothing handler (see 035 exception_wrappers.S), and it can NOT be 101 exception_wrappers.S), and it can NOT be overriden by the 036 functions below */ 102 functions below */ 037 return sos_idt_set_handler(SOS_EXCEPT_BASE + 103 return sos_idt_set_handler(SOS_EXCEPT_BASE + SOS_EXCEPT_DOUBLE_FAULT, 038 (sos_vaddr_t) sos_ 104 (sos_vaddr_t) sos_exception_wrapper_array[SOS_EXCEPT_DOUBLE_FAULT], 039 0 /* CPL0 routine 105 0 /* CPL0 routine */); 040 } 106 } 041 107 042 108 043 sos_ret_t sos_exception_set_routine(int except 109 sos_ret_t sos_exception_set_routine(int exception_number, 044 sos_except 110 sos_exception_handler_t routine) 045 { 111 { 046 sos_ret_t retval; 112 sos_ret_t retval; 047 sos_ui32_t flags; 113 sos_ui32_t flags; 048 114 049 if ((exception_number < 0) || (exception_num 115 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 050 return -SOS_EINVAL; 116 return -SOS_EINVAL; 051 117 052 /* Double fault not supported */ 118 /* Double fault not supported */ 053 if (exception_number == SOS_EXCEPT_DOUBLE_FA 119 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 054 return -SOS_ENOSUP; 120 return -SOS_ENOSUP; 055 121 056 sos_disable_IRQs(flags); 122 sos_disable_IRQs(flags); 057 123 058 retval = SOS_OK; 124 retval = SOS_OK; 059 125 060 /* Set the exception routine to be called by 126 /* Set the exception routine to be called by the exception wrapper */ 061 sos_exception_handler_array[exception_number 127 sos_exception_handler_array[exception_number] = routine; 062 128 063 /* If the exception is to be enabled, update 129 /* If the exception is to be enabled, update the IDT with the exception 064 wrapper */ 130 wrapper */ 065 if (routine != NULL) 131 if (routine != NULL) 066 retval 132 retval 067 = sos_idt_set_handler(SOS_EXCEPT_BASE + 133 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 068 (sos_vaddr_t) sos_ 134 (sos_vaddr_t) sos_exception_wrapper_array[exception_number], 069 0 /* CPL0 routine 135 0 /* CPL0 routine */); 070 else /* Disable the IDT entry */ 136 else /* Disable the IDT entry */ 071 retval 137 retval 072 = sos_idt_set_handler(SOS_EXCEPT_BASE + 138 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 073 (sos_vaddr_t)NULL 139 (sos_vaddr_t)NULL /* No routine => disable IDTE */, 074 0 /* don't care */ 140 0 /* don't care */); 075 141 076 sos_restore_IRQs(flags); 142 sos_restore_IRQs(flags); 077 return retval; 143 return retval; 078 } 144 } 079 145 080 146 081 sos_exception_handler_t sos_exception_get_rout 147 sos_exception_handler_t sos_exception_get_routine(int exception_number) 082 { 148 { 083 if ((exception_number < 0) || (exception_num 149 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 084 return NULL; 150 return NULL; 085 151 086 /* Double fault not supported */ 152 /* Double fault not supported */ 087 if (exception_number == SOS_EXCEPT_DOUBLE_FA 153 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 088 return NULL; 154 return NULL; 089 155 090 /* Expected to be atomic */ 156 /* Expected to be atomic */ 091 return sos_exception_handler_array[exception 157 return sos_exception_handler_array[exception_number]; >> 158 } >> 159 >> 160 >> 161 const char * sos_exception_get_name(int exception_number) >> 162 { >> 163 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) >> 164 return NULL; >> 165 >> 166 return sos_x86_exnames[exception_number]; 092 } 167 }
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