This source file includes following definitions.
- do_page_fault
1
2
3
4
5
6
7 #include <linux/signal.h>
8 #include <linux/sched.h>
9 #include <linux/head.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/types.h>
14 #include <linux/ptrace.h>
15 #include <linux/mman.h>
16 #include <linux/mm.h>
17
18 #include <asm/system.h>
19 #include <asm/segment.h>
20 #include <asm/pgtable.h>
21
22 extern void die_if_kernel(char *,struct pt_regs *,long);
23 extern void tbi(unsigned long type, unsigned long arg);
24 #define tbisi(x) tbi(1,(x))
25 #define tbisd(x) tbi(2,(x))
26 #define tbis(x) tbi(3,(x))
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44 asmlinkage void do_page_fault(unsigned long address, unsigned long mmcsr, long cause,
45 unsigned long a3, unsigned long a4, unsigned long a5,
46 struct pt_regs regs)
47 {
48 struct vm_area_struct * vma;
49
50 vma = find_vma(current, address);
51 if (!vma)
52 goto bad_area;
53 if (vma->vm_start <= address)
54 goto good_area;
55 if (!(vma->vm_flags & VM_GROWSDOWN))
56 goto bad_area;
57 if (expand_stack(vma, address))
58 goto bad_area;
59
60
61
62
63 good_area:
64 if (cause < 0) {
65 if (!(vma->vm_flags & VM_EXEC))
66 goto bad_area;
67 } else if (!cause) {
68
69 if (!(vma->vm_flags & (VM_READ | VM_WRITE)))
70 goto bad_area;
71 } else {
72 if (!(vma->vm_flags & VM_WRITE))
73 goto bad_area;
74 }
75 tbis(address);
76 handle_mm_fault(vma, address, cause > 0);
77 return;
78
79
80
81
82
83 bad_area:
84 if (user_mode(®s)) {
85 printk("memory violation at pc=%08lx (%08lx)\n", regs.pc, address);
86 die_if_kernel("oops", ®s, cause);
87 send_sig(SIGSEGV, current, 1);
88 return;
89 }
90
91
92
93
94 printk(KERN_ALERT "Unable to handle kernel paging request at virtual address %08lx\n",address);
95 die_if_kernel("Oops", ®s, cause);
96 do_exit(SIGKILL);
97 }