From d62cbf45a84d442a6b79d993c05edfb283bab8f8 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 19 Mar 2009 19:34:11 +0000 Subject: powerpc/mm: Rename arch/powerpc/kernel/mmap.c to mmap_64.c This file is only useful on 64-bit, so we name it accordingly. Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/mm/Makefile | 2 +- arch/powerpc/mm/mmap.c | 109 ---------------------------------------------- arch/powerpc/mm/mmap_64.c | 109 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 110 insertions(+), 110 deletions(-) delete mode 100644 arch/powerpc/mm/mmap.c create mode 100644 arch/powerpc/mm/mmap_64.c diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile index 6d2838f..17290bc 100644 --- a/arch/powerpc/mm/Makefile +++ b/arch/powerpc/mm/Makefile @@ -14,7 +14,7 @@ obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \ hash-$(CONFIG_PPC_NATIVE) := hash_native_64.o obj-$(CONFIG_PPC64) += hash_utils_64.o \ slb_low.o slb.o stab.o \ - mmap.o $(hash-y) + mmap_64.o $(hash-y) obj-$(CONFIG_PPC_STD_MMU_32) += ppc_mmu_32.o obj-$(CONFIG_PPC_STD_MMU) += hash_low_$(CONFIG_WORD_SIZE).o \ tlb_hash$(CONFIG_WORD_SIZE).o \ diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c deleted file mode 100644 index 0d957a4..0000000 --- a/arch/powerpc/mm/mmap.c +++ /dev/null @@ -1,109 +0,0 @@ -/* - * 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 - */ - -#include -#include -#include -#include - -/* - * Top of mmap area (just below the process stack). - * - * Leave at least a ~128 MB hole on 32bit applications. - * - * On 64bit applications we randomise the stack by 1GB so we need to - * space our mmap start address by a further 1GB, otherwise there is a - * chance the mmap area will end up closer to the stack than our ulimit - * requires. - */ -#define MIN_GAP32 (128*1024*1024) -#define MIN_GAP64 ((128 + 1024)*1024*1024UL) -#define MIN_GAP ((is_32bit_task()) ? MIN_GAP32 : MIN_GAP64) -#define MAX_GAP (TASK_SIZE/6*5) - -static inline int mmap_is_legacy(void) -{ - if (current->personality & ADDR_COMPAT_LAYOUT) - return 1; - - if (current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) - return 1; - - return sysctl_legacy_va_layout; -} - -/* - * Since get_random_int() returns the same value within a 1 jiffy window, - * we will almost always get the same randomisation for the stack and mmap - * region. This will mean the relative distance between stack and mmap will - * be the same. - * - * To avoid this we can shift the randomness by 1 bit. - */ -static unsigned long mmap_rnd(void) -{ - unsigned long rnd = 0; - - if (current->flags & PF_RANDOMIZE) { - /* 8MB for 32bit, 1GB for 64bit */ - if (is_32bit_task()) - rnd = (long)(get_random_int() % (1<<(22-PAGE_SHIFT))); - else - rnd = (long)(get_random_int() % (1<<(29-PAGE_SHIFT))); - } - return (rnd << PAGE_SHIFT) * 2; -} - -static inline unsigned long mmap_base(void) -{ - unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur; - - if (gap < MIN_GAP) - gap = MIN_GAP; - else if (gap > MAX_GAP) - gap = MAX_GAP; - - return PAGE_ALIGN(TASK_SIZE - gap - mmap_rnd()); -} - -/* - * 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; - } -} diff --git a/arch/powerpc/mm/mmap_64.c b/arch/powerpc/mm/mmap_64.c new file mode 100644 index 0000000..0d957a4 --- /dev/null +++ b/arch/powerpc/mm/mmap_64.c @@ -0,0 +1,109 @@ +/* + * 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 + */ + +#include +#include +#include +#include + +/* + * Top of mmap area (just below the process stack). + * + * Leave at least a ~128 MB hole on 32bit applications. + * + * On 64bit applications we randomise the stack by 1GB so we need to + * space our mmap start address by a further 1GB, otherwise there is a + * chance the mmap area will end up closer to the stack than our ulimit + * requires. + */ +#define MIN_GAP32 (128*1024*1024) +#define MIN_GAP64 ((128 + 1024)*1024*1024UL) +#define MIN_GAP ((is_32bit_task()) ? MIN_GAP32 : MIN_GAP64) +#define MAX_GAP (TASK_SIZE/6*5) + +static inline int mmap_is_legacy(void) +{ + if (current->personality & ADDR_COMPAT_LAYOUT) + return 1; + + if (current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY) + return 1; + + return sysctl_legacy_va_layout; +} + +/* + * Since get_random_int() returns the same value within a 1 jiffy window, + * we will almost always get the same randomisation for the stack and mmap + * region. This will mean the relative distance between stack and mmap will + * be the same. + * + * To avoid this we can shift the randomness by 1 bit. + */ +static unsigned long mmap_rnd(void) +{ + unsigned long rnd = 0; + + if (current->flags & PF_RANDOMIZE) { + /* 8MB for 32bit, 1GB for 64bit */ + if (is_32bit_task()) + rnd = (long)(get_random_int() % (1<<(22-PAGE_SHIFT))); + else + rnd = (long)(get_random_int() % (1<<(29-PAGE_SHIFT))); + } + return (rnd << PAGE_SHIFT) * 2; +} + +static inline unsigned long mmap_base(void) +{ + unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur; + + if (gap < MIN_GAP) + gap = MIN_GAP; + else if (gap > MAX_GAP) + gap = MAX_GAP; + + return PAGE_ALIGN(TASK_SIZE - gap - mmap_rnd()); +} + +/* + * 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; + } +} -- cgit v1.1