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>
10#include <asm/elf.h>
11
12static struct vm_area_struct gate_vma;
13
14static 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
25	return 0;
26}
27__initcall(gate_vma_init);
28
29struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
30{
31	return FIXADDR_USER_START ? &gate_vma : NULL;
32}
33
34int 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
45int 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}

 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>
10#include <asm/elf.h>
11
12static struct vm_area_struct gate_vma;
13
14static 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
25	return 0;
26}
27__initcall(gate_vma_init);
28
29struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
30{
31	return FIXADDR_USER_START ? &gate_vma : NULL;
32}
33
34int 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
45int 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}