page.s

/*
 * linux/mm/page.s
 *
 * (C) 1991 Linus Torvalds
 */

/*
 * page.s contains the low-level page-exception code.
 * the real work is done in mm.c
 */

.globl _page_fault

_page_fault:
    xchgl %eax,(%esp)
    pushl %ecx
    pushl %edx
    push %ds
    push %es
    push %fs
    movl $0x10,%edx
    mov %dx,%ds
    mov %dx,%es
    mov %dx,%fs
    movl %cr2,%edx
    pushl %edx
    pushl %eax
    testl $1,%eax
    jne 1f
    call _do_no_page//调用缺页中断处理函数，error_code是有CPU自动产生的，mm/memory.c line 365
    jmp 2f
1:    call _do_wp_page//调用写保护处理函数,error_code是有CPU自动产生的，mm/memory.c line 247
2:    addl $8,%esp
    pop %fs
    pop %es
    pop %ds
    popl %edx
    popl %ecx
    popl %eax
    iret