This source file includes following definitions.
- do_page_fault
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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>
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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))
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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;
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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 (vma->vm_end - address > current->rlim[RLIMIT_STACK].rlim_cur)
58 goto bad_area;
59 vma->vm_offset -= vma->vm_start - (address & PAGE_MASK);
60 vma->vm_start = (address & PAGE_MASK);
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65 good_area:
66 if (cause < 0) {
67 if (!(vma->vm_flags & VM_EXEC))
68 goto bad_area;
69 } else if (!cause) {
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71 if (!(vma->vm_flags & (VM_READ | VM_WRITE)))
72 goto bad_area;
73 } else {
74 if (!(vma->vm_flags & VM_WRITE))
75 goto bad_area;
76 }
77 tbis(address);
78 handle_mm_fault(vma, address, cause > 0);
79 return;
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85 bad_area:
86 if (user_mode(®s)) {
87 printk("memory violation at pc=%08lx (%08lx)\n", regs.pc, address);
88 die_if_kernel("oops", ®s, cause);
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", ®s, cause);
98 do_exit(SIGKILL);
99 }