Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
81 lines
2.0 KiB
C
81 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ARC700 mmap
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*
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* (started from arm version - for VIPT alias handling)
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*
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* Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/mman.h>
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#include <linux/sched/mm.h>
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#include <asm/cacheflush.h>
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/*
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* Ensure that shared mappings are correctly aligned to
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* avoid aliasing issues with VIPT caches.
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* We need to ensure that
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* a specific page of an object is always mapped at a multiple of
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* SHMLBA bytes.
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*/
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unsigned long
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arch_get_unmapped_area(struct file *filp, unsigned long addr,
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unsigned long len, unsigned long pgoff,
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unsigned long flags, vm_flags_t vm_flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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struct vm_unmapped_area_info info = {};
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/*
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* We enforce the MAP_FIXED case.
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*/
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if (flags & MAP_FIXED) {
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if (flags & MAP_SHARED &&
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(addr - (pgoff << PAGE_SHIFT)) & (SHMLBA - 1))
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return -EINVAL;
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return addr;
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}
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if (len > TASK_SIZE)
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return -ENOMEM;
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if (addr) {
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addr = PAGE_ALIGN(addr);
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vma = find_vma(mm, addr);
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if (TASK_SIZE - len >= addr &&
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(!vma || addr + len <= vm_start_gap(vma)))
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return addr;
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}
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info.length = len;
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info.low_limit = mm->mmap_base;
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info.high_limit = TASK_SIZE;
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info.align_offset = pgoff << PAGE_SHIFT;
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return vm_unmapped_area(&info);
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}
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static const pgprot_t protection_map[16] = {
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[VM_NONE] = PAGE_U_NONE,
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[VM_READ] = PAGE_U_R,
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[VM_WRITE] = PAGE_U_R,
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[VM_WRITE | VM_READ] = PAGE_U_R,
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[VM_EXEC] = PAGE_U_X_R,
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[VM_EXEC | VM_READ] = PAGE_U_X_R,
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[VM_EXEC | VM_WRITE] = PAGE_U_X_R,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_U_X_R,
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[VM_SHARED] = PAGE_U_NONE,
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[VM_SHARED | VM_READ] = PAGE_U_R,
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[VM_SHARED | VM_WRITE] = PAGE_U_W_R,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_U_W_R,
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[VM_SHARED | VM_EXEC] = PAGE_U_X_R,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_U_X_R,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_U_X_W_R,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_U_X_W_R
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};
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DECLARE_VM_GET_PAGE_PROT
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