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548f0a4e RW |
1 | /* |
2 | * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | */ | |
8 | ||
9 | #include <linux/mm.h> | |
27795673 | 10 | #include <asm/elf.h> |
548f0a4e RW |
11 | |
12 | static struct vm_area_struct gate_vma; | |
13 | ||
14 | static int __init gate_vma_init(void) | |
15 | { | |
16 | if (!FIXADDR_USER_START) | |
17 | return 0; | |
18 | ||
19 | gate_vma.vm_mm = NULL; | |
20 | gate_vma.vm_start = FIXADDR_USER_START; | |
21 | gate_vma.vm_end = FIXADDR_USER_END; | |
22 | gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; | |
23 | gate_vma.vm_page_prot = __P101; | |
24 | ||
548f0a4e RW |
25 | return 0; |
26 | } | |
27 | __initcall(gate_vma_init); | |
28 | ||
29 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
30 | { | |
31 | return FIXADDR_USER_START ? &gate_vma : NULL; | |
32 | } | |
33 | ||
34 | int in_gate_area_no_mm(unsigned long addr) | |
35 | { | |
36 | if (!FIXADDR_USER_START) | |
37 | return 0; | |
38 | ||
39 | if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) | |
40 | return 1; | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
46 | { | |
47 | struct vm_area_struct *vma = get_gate_vma(mm); | |
48 | ||
49 | if (!vma) | |
50 | return 0; | |
51 | ||
52 | return (addr >= vma->vm_start) && (addr < vma->vm_end); | |
53 | } |