启用分页导致三重故障已解决

如何解决启用分页导致三重故障已解决

如果这对将来的某人有所帮助：

检查全局描述符表是否正常工作
检查页表条目结构的元素是否正确排序

gdt.s

section .data
gdt:
    .null:
        dq 0
    .code:
        dw 0xFFFF
        dw 0x0000
        db 0x00
        db 0x9A
        db 0xCF
        db 0x00
    .data:
        dw 0xFFFF
        dw 0x0000
        db 0x00
        db 0x92
        db 0xCF
        db 0x00

gdtr:
    dw $-gdt-1
    dd gdt

section .text

global init_global_descriptor_table
init_global_descriptor_table:
    lgdt [gdtr]
    jmp 0x08:.reload_cs

.reload_cs:
    mov ax,0x10
    mov ds,ax
    mov es,ax
    mov fs,ax
    mov gs,ax
    mov ss,ax
    ret

paging.c

enum flags {
    Present = 1 << 0,ReadWrite = 1 << 1,AccessAll = 1 << 2,WriteThroughCashing = 1 << 3,disableCashing = 1 << 4,Accessed = 1 << 5,Dirty = 1 << 6,// only for page-table-entries
    MPages = 1 << 7,Global = 1 << 8,// only for page-table-entries
};

struct entry {
    unsigned int flags : 9;
    unsigned int available : 3;
    unsigned int addr : 20;
};

extern void load_paging_directory(int *ptr);

void init_paging() {
    struct entry *dir = (struct entry *)0x00105000;
    struct entry *t1 = (struct entry *)0x00106000;      

    for (int i = 0; i < 1024; i++) {
        dir[i] = (struct entry){0};
        if (i <= 262) t1[i] = (struct entry){Present | ReadWrite,i};
    }

    dir[0] = (struct entry){Present,(int)t1 >> 12};
    load_paging_directory((int *)dir);
}

paging_asm.s

global load_paging_directory
load_paging_directory:
    push ebp,mov ebp,esp
    mov eax,[ebp + 8]
    mov cr3,eax
    mov eax,cr0
    or eax,0x80000001
    mov cr0,eax   
    mov esp,ebp
    pop ebp
    ret

我的错误是我的结构在低位中有地址字段，在高位中有标志字段。这是一些非常奇怪的行为的原因。最后它没有在 mov cr0,eax 崩溃，而是在 mov esp,ebp 崩溃。感谢每一位评论的人。

解决方法

问题已使用此结构解决：

struct entry {
    unsigned int flags : 9;
    unsigned int available : 3;
    unsigned int addr : 20;
};