108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
#include "exception.h"
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#include "cpu_context.h"
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#include "idt.h"
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#include "interrupt.h"
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#include "irq.h"
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#include "klibc.h"
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#include "process.h"
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#include "thread.h"
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#include "types.h"
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#include "uaddrspace.h"
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#include "vga.h"
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exception_handler exception_handler_array[EXCEPTION_NUM] = {
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NULL,
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};
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extern vaddr_t exception_handler_wrapper_array[EXCEPTION_NUM];
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void exception_handler_wrap(int intr, struct cpu_state *frame)
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{
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if (0 > intr || EXCEPTION_NUM <= intr) {
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pr_err("Trying to handle unknow exception %d\n", intr);
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return;
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}
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if (exception_handler_array[intr] != NULL)
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exception_handler_array[intr](frame, intr);
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}
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int exceptionSetRoutine(int exception, exception_handler handler)
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{
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uint32_t flags;
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if ((exception < 0) || exception >= EXCEPTION_NUM)
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return -1;
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disable_IRQs(flags);
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exception_handler_array[exception] = handler;
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idt_set_handler(EXCEPTION_INTERRUPT_BASE_ADDRESS + exception,
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(unsigned int)exception_handler_wrapper_array[exception], 0);
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restore_IRQs(flags);
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return 0;
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}
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void print_handler(struct cpu_state *frame, ulong intr)
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{
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VGAPrintf(RED, BLACK, 0, VGA_HEIGHT - 1, "EXCEPTION %lu", intr);
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printf("Exception %lu at 0x%p\n", intr, (void *)cpu_context_get_PC(frame));
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asm("hlt");
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}
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void pagefault_handler(struct cpu_state *frame, ulong intr)
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{
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// PAGE_FAULT is a interrupt with an error code (see exception_wrapper.S)
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uint32_t error_code = cpu_context_get_EX_err(frame);
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struct thread *current = getCurrentThread();
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if (cpu_context_is_in_user_mode(current->cpuState)) {
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assert(frame == current->cpuState); // pagefault in kernel not supported ATM
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struct uAddrSpace *as = processGetAddrSpace(current->process);
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vaddr_t faultAddr = cpu_context_get_EX_faulting_vaddr(frame);
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int needMMUSetup =
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(uAddrSpaceGetMMUContext(as) != getCurrentThread()->squattedContext);
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if (needMMUSetup) {
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threadChangeCurrentContext(uAddrSpaceGetMMUContext(as));
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}
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if (!uAddrSpaceHeapCheckNAlloc(as, faultAddr))
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goto release_context;
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int ret = uAddrSpaceSolvePageFault(as, faultAddr, error_code & 0x2);
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if (!ret)
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goto release_context;
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printf(
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"page fault while in thread [%s] at 0x%p when trying to access 0x%p err_code 0x%x ressource ret %d\n",
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current->name, (void *)cpu_context_get_PC(frame), (void *)faultAddr, error_code,
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ret);
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printf("Killing User Thread\n");
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threadExit();
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release_context:
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if (needMMUSetup)
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threadChangeCurrentContext(NULL);
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return;
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}
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VGAPrintf(RED, BLACK, 0, VGA_HEIGHT - 1, "PAGE FAULT %d", intr);
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for (;;)
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continue;
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}
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int exceptionSetup()
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{
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for (int i = 0; i < EXCEPTION_NUM; i++) {
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exceptionSetRoutine(i, print_handler);
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}
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exceptionSetRoutine(EXCEPTION_PAGE_FAULT, pagefault_handler);
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return 0;
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}
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