diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/s390/mm/mmap.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/s390/mm/mmap.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/ANDROID_3.4.5/arch/s390/mm/mmap.c b/ANDROID_3.4.5/arch/s390/mm/mmap.c deleted file mode 100644 index 2857c484..00000000 --- a/ANDROID_3.4.5/arch/s390/mm/mmap.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * linux/arch/s390/mm/mmap.c - * - * flexible mmap layout support - * - * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina. - * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * - * Started by Ingo Molnar <mingo@elte.hu> - */ - -#include <linux/personality.h> -#include <linux/mm.h> -#include <linux/mman.h> -#include <linux/module.h> -#include <linux/random.h> -#include <linux/compat.h> -#include <asm/pgalloc.h> - -static unsigned long stack_maxrandom_size(void) -{ - if (!(current->flags & PF_RANDOMIZE)) - return 0; - if (current->personality & ADDR_NO_RANDOMIZE) - return 0; - return STACK_RND_MASK << PAGE_SHIFT; -} - -/* - * Top of mmap area (just below the process stack). - * - * Leave at least a ~32 MB hole. - */ -#define MIN_GAP (32*1024*1024) -#define MAX_GAP (STACK_TOP/6*5) - -static inline int mmap_is_legacy(void) -{ - if (current->personality & ADDR_COMPAT_LAYOUT) - return 1; - if (rlimit(RLIMIT_STACK) == RLIM_INFINITY) - return 1; - return sysctl_legacy_va_layout; -} - -static unsigned long mmap_rnd(void) -{ - if (!(current->flags & PF_RANDOMIZE)) - return 0; - /* 8MB randomization for mmap_base */ - return (get_random_int() & 0x7ffUL) << PAGE_SHIFT; -} - -static inline unsigned long mmap_base(void) -{ - unsigned long gap = rlimit(RLIMIT_STACK); - - if (gap < MIN_GAP) - gap = MIN_GAP; - else if (gap > MAX_GAP) - gap = MAX_GAP; - gap &= PAGE_MASK; - return STACK_TOP - stack_maxrandom_size() - mmap_rnd() - gap; -} - -#ifndef CONFIG_64BIT - -/* - * This function, called very early during the creation of a new - * process VM image, sets up which VM layout function to use: - */ -void arch_pick_mmap_layout(struct mm_struct *mm) -{ - /* - * Fall back to the standard layout if the personality - * bit is set, or if the expected stack growth is unlimited: - */ - if (mmap_is_legacy()) { - mm->mmap_base = TASK_UNMAPPED_BASE; - mm->get_unmapped_area = arch_get_unmapped_area; - mm->unmap_area = arch_unmap_area; - } else { - mm->mmap_base = mmap_base(); - mm->get_unmapped_area = arch_get_unmapped_area_topdown; - mm->unmap_area = arch_unmap_area_topdown; - } -} - -#else - -int s390_mmap_check(unsigned long addr, unsigned long len) -{ - if (!is_compat_task() && - len >= TASK_SIZE && TASK_SIZE < (1UL << 53)) - return crst_table_upgrade(current->mm, 1UL << 53); - return 0; -} - -static unsigned long -s390_get_unmapped_area(struct file *filp, unsigned long addr, - unsigned long len, unsigned long pgoff, unsigned long flags) -{ - struct mm_struct *mm = current->mm; - unsigned long area; - int rc; - - area = arch_get_unmapped_area(filp, addr, len, pgoff, flags); - if (!(area & ~PAGE_MASK)) - return area; - if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) { - /* Upgrade the page table to 4 levels and retry. */ - rc = crst_table_upgrade(mm, 1UL << 53); - if (rc) - return (unsigned long) rc; - area = arch_get_unmapped_area(filp, addr, len, pgoff, flags); - } - return area; -} - -static unsigned long -s390_get_unmapped_area_topdown(struct file *filp, const unsigned long addr, - const unsigned long len, const unsigned long pgoff, - const unsigned long flags) -{ - struct mm_struct *mm = current->mm; - unsigned long area; - int rc; - - area = arch_get_unmapped_area_topdown(filp, addr, len, pgoff, flags); - if (!(area & ~PAGE_MASK)) - return area; - if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) { - /* Upgrade the page table to 4 levels and retry. */ - rc = crst_table_upgrade(mm, 1UL << 53); - if (rc) - return (unsigned long) rc; - area = arch_get_unmapped_area_topdown(filp, addr, len, - pgoff, flags); - } - return area; -} -/* - * This function, called very early during the creation of a new - * process VM image, sets up which VM layout function to use: - */ -void arch_pick_mmap_layout(struct mm_struct *mm) -{ - /* - * Fall back to the standard layout if the personality - * bit is set, or if the expected stack growth is unlimited: - */ - if (mmap_is_legacy()) { - mm->mmap_base = TASK_UNMAPPED_BASE; - mm->get_unmapped_area = s390_get_unmapped_area; - mm->unmap_area = arch_unmap_area; - } else { - mm->mmap_base = mmap_base(); - mm->get_unmapped_area = s390_get_unmapped_area_topdown; - mm->unmap_area = arch_unmap_area_topdown; - } -} - -#endif |