184 lines
6.4 KiB
C
184 lines
6.4 KiB
C
/* Copyright (C) 2004 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#include "idt.h"
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#include "irq.h"
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#include <sos/assert.h>
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#include <drivers/bochs.h>
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#include <sos/thread.h>
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#include "exception.h"
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/* array of exception wrappers, defined in exception_wrappers.S */
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extern sos_vaddr_t sos_exception_wrapper_array[SOS_EXCEPT_NUM];
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/* arrays of exception handlers, shared with exception_wrappers.S */
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sos_exception_handler_t sos_exception_handler_array[SOS_EXCEPT_NUM] =
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{ NULL, };
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/* List of exception names for the x86 architecture */
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static const char * sos_x86_exnames[] = {
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[SOS_EXCEPT_DIVIDE_ERROR] = "Division by zero",
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[SOS_EXCEPT_DEBUG] = "Debug",
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[SOS_EXCEPT_NMI_INTERRUPT] = "Non Maskable Interrupt",
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[SOS_EXCEPT_BREAKPOINT] = "Breakpoint",
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[SOS_EXCEPT_OVERFLOW] = "Overflow",
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[SOS_EXCEPT_BOUND_RANGE_EXCEDEED] = "Bound Range Exceeded",
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[SOS_EXCEPT_INVALID_OPCODE] = "Invalid Opcode",
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[SOS_EXCEPT_DEVICE_NOT_AVAILABLE] = "Device Unavailable",
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[SOS_EXCEPT_DOUBLE_FAULT] = "Double Fault",
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[SOS_EXCEPT_COPROCESSOR_SEGMENT_OVERRUN] = "Coprocessor Segment Overrun",
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[SOS_EXCEPT_INVALID_TSS] = "Invalid TSS",
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[SOS_EXCEPT_SEGMENT_NOT_PRESENT] = "Segment Not Present",
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[SOS_EXCEPT_STACK_SEGMENT_FAULT] = "Stack Segfault",
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[SOS_EXCEPT_GENERAL_PROTECTION] = "General Protection",
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[SOS_EXCEPT_PAGE_FAULT] = "Page Fault",
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[SOS_EXCEPT_INTEL_RESERVED_1] = "INTEL1",
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[SOS_EXCEPT_FLOATING_POINT_ERROR] = "FP Error",
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[SOS_EXCEPT_ALIGNEMENT_CHECK] = "Alignment Check",
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[SOS_EXCEPT_MACHINE_CHECK] = "Machine Check",
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[SOS_EXCEPT_INTEL_RESERVED_2] = "INTEL2",
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[SOS_EXCEPT_INTEL_RESERVED_3] = "INTEL3",
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[SOS_EXCEPT_INTEL_RESERVED_4] = "INTEL4",
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[SOS_EXCEPT_INTEL_RESERVED_5] = "INTEL5",
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[SOS_EXCEPT_INTEL_RESERVED_6] = "INTEL6",
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[SOS_EXCEPT_INTEL_RESERVED_7] = "INTEL7",
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[SOS_EXCEPT_INTEL_RESERVED_8] = "INTEL8",
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[SOS_EXCEPT_INTEL_RESERVED_9] = "INTEL9",
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[SOS_EXCEPT_INTEL_RESERVED_10] = "INTEL10",
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[SOS_EXCEPT_INTEL_RESERVED_11] = "INTEL11",
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[SOS_EXCEPT_INTEL_RESERVED_12] = "INTEL12",
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[SOS_EXCEPT_INTEL_RESERVED_13] = "INTEL13",
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[SOS_EXCEPT_INTEL_RESERVED_14] = "INTEL14"
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};
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/* Catch-all exception handler */
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static void sos_generic_ex(int exid, struct sos_cpu_state *ctxt)
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__attribute__((noreturn));
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static void sos_generic_ex(int exid, struct sos_cpu_state *ctxt)
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{
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const char *exname = sos_exception_get_name(exid);
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if (sos_cpu_context_is_in_user_mode(ctxt))
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{
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/* Exception while in user mode */
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sos_bochs_printf("Exception %s in User mode at instruction 0x%x (info=%x)!\n",
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exname,
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sos_cpu_context_get_PC(ctxt),
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(unsigned)sos_cpu_context_get_EX_info(ctxt));
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sos_bochs_printf("Terminating User thread\n");
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sos_thread_exit();
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}
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else
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sos_display_fatal_error("Exception %s in Kernel at instruction 0x%x (info=%x)!\n",
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exname,
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sos_cpu_context_get_PC(ctxt),
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(unsigned)sos_cpu_context_get_EX_info(ctxt));
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}
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sos_ret_t sos_exception_subsystem_setup(void)
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{
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sos_ret_t retval;
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int exid;
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/* Setup the generic exception handler by default for everybody
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except for the double fault exception */
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for (exid = 0 ; exid < SOS_EXCEPT_NUM ; exid ++)
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{
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/* Skip double fault (see below) */
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if (exid == SOS_EXCEPT_DOUBLE_FAULT)
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continue;
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retval = sos_exception_set_routine(exid, sos_generic_ex);
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if (SOS_OK != retval)
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return retval;
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}
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/* We inidicate that the double fault exception handler is defined,
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and give its address. this handler is a do-nothing handler (see
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exception_wrappers.S), and it can NOT be overriden by the
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functions below */
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return sos_idt_set_handler(SOS_EXCEPT_BASE + SOS_EXCEPT_DOUBLE_FAULT,
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(sos_vaddr_t) sos_exception_wrapper_array[SOS_EXCEPT_DOUBLE_FAULT],
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0 /* CPL0 routine */);
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}
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sos_ret_t sos_exception_set_routine(int exception_number,
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sos_exception_handler_t routine)
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{
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sos_ret_t retval;
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sos_ui32_t flags;
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if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM))
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return -SOS_EINVAL;
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/* Double fault not supported */
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if (exception_number == SOS_EXCEPT_DOUBLE_FAULT)
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return -SOS_ENOSUP;
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sos_disable_IRQs(flags);
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retval = SOS_OK;
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/* Set the exception routine to be called by the exception wrapper */
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sos_exception_handler_array[exception_number] = routine;
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/* If the exception is to be enabled, update the IDT with the exception
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wrapper */
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if (routine != NULL)
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retval
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= sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number,
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(sos_vaddr_t) sos_exception_wrapper_array[exception_number],
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0 /* CPL0 routine */);
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else /* Disable the IDT entry */
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retval
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= sos_idt_set_handler(SOS_EXCEPT_BASE + exception_number,
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(sos_vaddr_t)NULL /* No routine => disable IDTE */,
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0 /* don't care */);
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sos_restore_IRQs(flags);
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return retval;
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}
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sos_exception_handler_t sos_exception_get_routine(int exception_number)
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{
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if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM))
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return NULL;
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/* Double fault not supported */
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if (exception_number == SOS_EXCEPT_DOUBLE_FAULT)
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return NULL;
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/* Expected to be atomic */
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return sos_exception_handler_array[exception_number];
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}
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const char * sos_exception_get_name(int exception_number)
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{
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if ((exception_number < 0) || (exception_number >= SOS_EXCEPT_NUM))
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return NULL;
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return sos_x86_exnames[exception_number];
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}
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