matos/core/exception_handler.c

#include "exception.h"
#include "vga.h"

// Need GCC > 6
__attribute__((interrupt)) void print_handler(struct interrupt_frame *frame, ulong error_code)
{

        printStringDetails("EXCEPTION", RED, BLACK, 0, VGA_HEIGHT - 1);
        printIntDetails(error_code, RED, BLACK, 11, VGA_HEIGHT - 1);
        (void)frame;
        (void)error_code;
}

// c.f. https://wiki.osdev.org/Paging#Handling
// error_code   bit0: Present ?
//              bit1: Trying to write ?
//              bit2: User page try to access?
__attribute__((interrupt)) void pagefault_handler(struct interrupt_frame *frame,
                                                  ulong error_code)
{
        // A page fault has occurred.
        // The faulting address is stored in the CR2 register.
        uint32_t faulting_address;
        asm volatile("mov %%cr2, %0" : "=r"(faulting_address));

        printStringDetails("PAGE FAULT", RED, BLACK, 0, VGA_HEIGHT - 1);
        printIntDetails(error_code, RED, BLACK, 11, VGA_HEIGHT - 1);
        (void)faulting_address;
        (void)frame;
        (void)error_code;
}