This source file includes following definitions.
- do_page_fault
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7 #include <linux/config.h>
8 #include <linux/signal.h>
9 #include <linux/sched.h>
10 #include <linux/head.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/types.h>
15 #include <linux/ptrace.h>
16 #include <linux/mman.h>
17 #include <linux/mm.h>
18
19 #include <asm/system.h>
20 #include <asm/segment.h>
21 #include <asm/pgtable.h>
22
23 extern void die_if_kernel(char *,struct pt_regs *,long);
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42 asmlinkage void do_page_fault(unsigned long address, unsigned long mmcsr,
43 long cause, struct pt_regs * regs)
44 {
45 struct vm_area_struct * vma;
46
47 if (mmcsr == 1)
48 goto bad_area;
49 vma = find_vma(current, address);
50 if (!vma)
51 goto bad_area;
52 if (vma->vm_start <= address)
53 goto good_area;
54 if (!(vma->vm_flags & VM_GROWSDOWN))
55 goto bad_area;
56 if (vma->vm_end - address > current->rlim[RLIMIT_STACK].rlim_cur)
57 goto bad_area;
58 vma->vm_offset -= vma->vm_start - (address & PAGE_MASK);
59 vma->vm_start = (address & PAGE_MASK);
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64 good_area:
65 if (cause < 0) {
66 if (!(vma->vm_flags & VM_EXEC))
67 goto bad_area;
68 } else if (!cause) {
69 if (!(vma->vm_flags & VM_READ))
70 goto bad_area;
71 } else {
72 if (!(vma->vm_flags & VM_WRITE))
73 goto bad_area;
74 }
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76 if (mmcsr) {
77 do_wp_page(vma, address, cause > 0);
78 return;
79 }
80 do_no_page(vma, address, cause > 0);
81 return;
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87 bad_area:
88 if (user_mode(regs)) {
89 send_sig(SIGSEGV, current, 1);
90 return;
91 }
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96 printk(KERN_ALERT "Unable to handle kernel paging request at virtual address %08lx\n",address);
97 die_if_kernel("Oops", regs, cause);
98 do_exit(SIGKILL);
99 }