page.s

最早的linux操作系统源代码（3）

/*
 * 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
	jmp 2f
1:	call do_wp_page
2:	addl $8,%esp
	pop %fs
	pop %es
	pop %ds
	popl %edx
	popl %ecx
	popl %eax
	iret