| /* | |
| * Copyright (C) 2011 Richard Weinberger <richrd@nod.at> | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License version 2 as | |
| * published by the Free Software Foundation. | |
| */ | |
| #include <linux/mm.h> | |
| #include <asm/elf.h> | |
| static struct vm_area_struct gate_vma; | |
| static int __init gate_vma_init(void) | |
| { | |
| if (!FIXADDR_USER_START) | |
| return 0; | |
| gate_vma.vm_mm = NULL; | |
| gate_vma.vm_start = FIXADDR_USER_START; | |
| gate_vma.vm_end = FIXADDR_USER_END; | |
| gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC; | |
| gate_vma.vm_page_prot = __P101; | |
| return 0; | |
| } | |
| __initcall(gate_vma_init); | |
| struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | |
| { | |
| return FIXADDR_USER_START ? &gate_vma : NULL; | |
| } | |
| int in_gate_area_no_mm(unsigned long addr) | |
| { | |
| if (!FIXADDR_USER_START) | |
| return 0; | |
| if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) | |
| return 1; | |
| return 0; | |
| } | |
| int in_gate_area(struct mm_struct *mm, unsigned long addr) | |
| { | |
| struct vm_area_struct *vma = get_gate_vma(mm); | |
| if (!vma) | |
| return 0; | |
| return (addr >= vma->vm_start) && (addr < vma->vm_end); | |
| } |