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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 <drivers/bochs.h> >> 023 #include <sos/thread.h> >> 024 022 #include "exception.h" 025 #include "exception.h" 023 026 024 /* array of exception wrappers, defined in exc 027 /* array of exception wrappers, defined in exception_wrappers.S */ 025 extern sos_vaddr_t sos_exception_wrapper_array 028 extern sos_vaddr_t sos_exception_wrapper_array[SOS_EXCEPT_NUM]; 026 029 027 /* arrays of exception handlers, shared with e 030 /* arrays of exception handlers, shared with exception_wrappers.S */ 028 sos_exception_handler_t sos_exception_handler_ 031 sos_exception_handler_t sos_exception_handler_array[SOS_EXCEPT_NUM] = 029 { NULL, }; 032 { NULL, }; 030 033 >> 034 /* List of exception names for the x86 architecture */ >> 035 static const char * sos_x86_exnames[] = { >> 036 [SOS_EXCEPT_DIVIDE_ERROR] = "Division by zero", >> 037 [SOS_EXCEPT_DEBUG] = "Debug", >> 038 [SOS_EXCEPT_NMI_INTERRUPT] = "Non Maskable Interrupt", >> 039 [SOS_EXCEPT_BREAKPOINT] = "Breakpoint", >> 040 [SOS_EXCEPT_OVERFLOW] = "Overflow", >> 041 [SOS_EXCEPT_BOUND_RANGE_EXCEDEED] = "Bound Range Exceeded", >> 042 [SOS_EXCEPT_INVALID_OPCODE] = "Invalid Opcode", >> 043 [SOS_EXCEPT_DEVICE_NOT_AVAILABLE] = "Device Unavailable", >> 044 [SOS_EXCEPT_DOUBLE_FAULT] = "Double Fault", >> 045 [SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN] = "Coprocessor Segment Overrun", >> 046 [SOS_EXCEPT_INVALID_TSS] = "Invalid TSS", >> 047 [SOS_EXCEPT_SEGMENT_NOT_PRESENT] = "Segment Not Present", >> 048 [SOS_EXCEPT_STACK_SEGMENT_FAULT] = "Stack Segfault", >> 049 [SOS_EXCEPT_GENERAL_PROTECTION] = "General Protection", >> 050 [SOS_EXCEPT_PAGE_FAULT] = "Page Fault", >> 051 [SOS_EXCEPT_INTEL_RESERVED_1] = "INTEL1", >> 052 [SOS_EXCEPT_FLOATING_POINT_ERROR] = "FP Error", >> 053 [SOS_EXCEPT_ALIGNEMENT_CHECK] = "Alignment Check", >> 054 [SOS_EXCEPT_MACHINE_CHECK] = "Machine Check", >> 055 [SOS_EXCEPT_INTEL_RESERVED_2] = "INTEL2", >> 056 [SOS_EXCEPT_INTEL_RESERVED_3] = "INTEL3", >> 057 [SOS_EXCEPT_INTEL_RESERVED_4] = "INTEL4", >> 058 [SOS_EXCEPT_INTEL_RESERVED_5] = "INTEL5", >> 059 [SOS_EXCEPT_INTEL_RESERVED_6] = "INTEL6", >> 060 [SOS_EXCEPT_INTEL_RESERVED_7] = "INTEL7", >> 061 [SOS_EXCEPT_INTEL_RESERVED_8] = "INTEL8", >> 062 [SOS_EXCEPT_INTEL_RESERVED_9] = "INTEL9", >> 063 [SOS_EXCEPT_INTEL_RESERVED_10] = "INTEL10", >> 064 [SOS_EXCEPT_INTEL_RESERVED_11] = "INTEL11", >> 065 [SOS_EXCEPT_INTEL_RESERVED_12] = "INTEL12", >> 066 [SOS_EXCEPT_INTEL_RESERVED_13] = "INTEL13", >> 067 [SOS_EXCEPT_INTEL_RESERVED_14] = "INTEL14" >> 068 }; >> 069 >> 070 >> 071 /* Catch-all exception handler */ >> 072 static void sos_generic_ex(int exid, struct sos_cpu_state *ctxt) >> 073 __attribute__((noreturn)); >> 074 static void sos_generic_ex(int exid, struct sos_cpu_state *ctxt) >> 075 { >> 076 const char *exname = sos_exception_get_name(exid); >> 077 >> 078 if (sos_cpu_context_is_in_user_mode(ctxt)) >> 079 { >> 080 /* Exception while in user mode */ >> 081 sos_bochs_printf("Exception %s in User mode at instruction 0x%x (info=%x)!\n", >> 082 exname, >> 083 sos_cpu_context_get_PC(ctxt), >> 084 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 085 sos_bochs_printf("Terminating User thread\n"); >> 086 sos_thread_exit(); >> 087 } >> 088 else >> 089 sos_display_fatal_error("Exception %s in Kernel at instruction 0x%x (info=%x)!\n", >> 090 exname, >> 091 sos_cpu_context_get_PC(ctxt), >> 092 (unsigned)sos_cpu_context_get_EX_info(ctxt)); >> 093 } >> 094 >> 095 031 sos_ret_t sos_exception_subsystem_setup(void) 096 sos_ret_t sos_exception_subsystem_setup(void) 032 { 097 { >> 098 sos_ret_t retval; >> 099 int exid; >> 100 >> 101 /* Setup the generic exception handler by default for everybody >> 102 except for the double fault exception */ >> 103 for (exid = 0 ; exid < SOS_EXCEPT_NUM ; exid ++) >> 104 { >> 105 /* Skip double fault (see below) */ >> 106 if (exid == SOS_EXCEPT_DOUBLE_FAULT) >> 107 continue; >> 108 >> 109 retval = sos_exception_set_routine(exid, sos_generic_ex); >> 110 if (SOS_OK != retval) >> 111 return retval; >> 112 } >> 113 >> 114 033 /* We inidicate that the double fault except 115 /* We inidicate that the double fault exception handler is defined, 034 and give its address. this handler is a d 116 and give its address. this handler is a do-nothing handler (see 035 exception_wrappers.S), and it can NOT be 117 exception_wrappers.S), and it can NOT be overriden by the 036 functions below */ 118 functions below */ 037 return sos_idt_set_handler(SOS_EXCEPT_BASE + 119 return sos_idt_set_handler(SOS_EXCEPT_BASE + SOS_EXCEPT_DOUBLE_FAULT, 038 (sos_vaddr_t) sos_ 120 (sos_vaddr_t) sos_exception_wrapper_array[SOS_EXCEPT_DOUBLE_FAULT], 039 0 /* CPL0 routine 121 0 /* CPL0 routine */); 040 } 122 } 041 123 042 124 043 sos_ret_t sos_exception_set_routine(int except 125 sos_ret_t sos_exception_set_routine(int exception_number, 044 sos_except 126 sos_exception_handler_t routine) 045 { 127 { 046 sos_ret_t retval; 128 sos_ret_t retval; 047 sos_ui32_t flags; 129 sos_ui32_t flags; 048 130 049 if ((exception_number < 0) || (exception_num 131 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 050 return -SOS_EINVAL; 132 return -SOS_EINVAL; 051 133 052 /* Double fault not supported */ 134 /* Double fault not supported */ 053 if (exception_number == SOS_EXCEPT_DOUBLE_FA 135 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 054 return -SOS_ENOSUP; 136 return -SOS_ENOSUP; 055 137 056 sos_disable_IRQs(flags); 138 sos_disable_IRQs(flags); 057 139 058 retval = SOS_OK; 140 retval = SOS_OK; 059 141 060 /* Set the exception routine to be called by 142 /* Set the exception routine to be called by the exception wrapper */ 061 sos_exception_handler_array[exception_number 143 sos_exception_handler_array[exception_number] = routine; 062 144 063 /* If the exception is to be enabled, update 145 /* If the exception is to be enabled, update the IDT with the exception 064 wrapper */ 146 wrapper */ 065 if (routine != NULL) 147 if (routine != NULL) 066 retval 148 retval 067 = sos_idt_set_handler(SOS_EXCEPT_BASE + 149 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 068 (sos_vaddr_t) sos_ 150 (sos_vaddr_t) sos_exception_wrapper_array[exception_number], 069 0 /* CPL0 routine 151 0 /* CPL0 routine */); 070 else /* Disable the IDT entry */ 152 else /* Disable the IDT entry */ 071 retval 153 retval 072 = sos_idt_set_handler(SOS_EXCEPT_BASE + 154 = sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number, 073 (sos_vaddr_t)NULL 155 (sos_vaddr_t)NULL /* No routine => disable IDTE */, 074 0 /* don't care */ 156 0 /* don't care */); 075 157 076 sos_restore_IRQs(flags); 158 sos_restore_IRQs(flags); 077 return retval; 159 return retval; 078 } 160 } 079 161 080 162 081 sos_exception_handler_t sos_exception_get_rout 163 sos_exception_handler_t sos_exception_get_routine(int exception_number) 082 { 164 { 083 if ((exception_number < 0) || (exception_num 165 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) 084 return NULL; 166 return NULL; 085 167 086 /* Double fault not supported */ 168 /* Double fault not supported */ 087 if (exception_number == SOS_EXCEPT_DOUBLE_FA 169 if (exception_number == SOS_EXCEPT_DOUBLE_FAULT) 088 return NULL; 170 return NULL; 089 171 090 /* Expected to be atomic */ 172 /* Expected to be atomic */ 091 return sos_exception_handler_array[exception 173 return sos_exception_handler_array[exception_number]; >> 174 } >> 175 >> 176 >> 177 const char * sos_exception_get_name(int exception_number) >> 178 { >> 179 if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM)) >> 180 return NULL; >> 181 >> 182 return sos_x86_exnames[exception_number]; 092 } 183 }
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