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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
download | FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.gz FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.tar.bz2 FOSSEE-netbook-kernel-source-871480933a1c28f8a9fed4c4d34d06c439a7a422.zip |
Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c')
-rw-r--r-- | ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c b/ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c deleted file mode 100644 index c10b76ff..00000000 --- a/ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c +++ /dev/null @@ -1,187 +0,0 @@ -/* - * Memory fault handling for Hexagon - * - * Copyright (c) 2010-2011 Code Aurora Forum. 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 version 2 and - * only version 2 as published by the Free Software Foundation. - * - * 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., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - */ - -/* - * Page fault handling for the Hexagon Virtual Machine. - * Can also be called by a native port emulating the HVM - * execptions. - */ - -#include <asm/pgtable.h> -#include <asm/traps.h> -#include <asm/uaccess.h> -#include <linux/mm.h> -#include <linux/signal.h> -#include <linux/module.h> -#include <linux/hardirq.h> - -/* - * Decode of hardware exception sends us to one of several - * entry points. At each, we generate canonical arguments - * for handling by the abstract memory management code. - */ -#define FLT_IFETCH -1 -#define FLT_LOAD 0 -#define FLT_STORE 1 - - -/* - * Canonical page fault handler - */ -void do_page_fault(unsigned long address, long cause, struct pt_regs *regs) -{ - struct vm_area_struct *vma; - struct mm_struct *mm = current->mm; - siginfo_t info; - int si_code = SEGV_MAPERR; - int fault; - const struct exception_table_entry *fixup; - - /* - * If we're in an interrupt or have no user context, - * then must not take the fault. - */ - if (unlikely(in_interrupt() || !mm)) - goto no_context; - - local_irq_enable(); - - down_read(&mm->mmap_sem); - vma = find_vma(mm, address); - if (!vma) - goto bad_area; - - if (vma->vm_start <= address) - goto good_area; - - if (!(vma->vm_flags & VM_GROWSDOWN)) - goto bad_area; - - if (expand_stack(vma, address)) - goto bad_area; - -good_area: - /* Address space is OK. Now check access rights. */ - si_code = SEGV_ACCERR; - - switch (cause) { - case FLT_IFETCH: - if (!(vma->vm_flags & VM_EXEC)) - goto bad_area; - break; - case FLT_LOAD: - if (!(vma->vm_flags & VM_READ)) - goto bad_area; - break; - case FLT_STORE: - if (!(vma->vm_flags & VM_WRITE)) - goto bad_area; - break; - } - - fault = handle_mm_fault(mm, vma, address, (cause > 0)); - - /* The most common case -- we are done. */ - if (likely(!(fault & VM_FAULT_ERROR))) { - if (fault & VM_FAULT_MAJOR) - current->maj_flt++; - else - current->min_flt++; - - up_read(&mm->mmap_sem); - return; - } - - up_read(&mm->mmap_sem); - - /* Handle copyin/out exception cases */ - if (!user_mode(regs)) - goto no_context; - - if (fault & VM_FAULT_OOM) { - pagefault_out_of_memory(); - return; - } - - /* User-mode address is in the memory map, but we are - * unable to fix up the page fault. - */ - if (fault & VM_FAULT_SIGBUS) { - info.si_signo = SIGBUS; - info.si_code = BUS_ADRERR; - } - /* Address is not in the memory map */ - else { - info.si_signo = SIGSEGV; - info.si_code = SEGV_ACCERR; - } - info.si_errno = 0; - info.si_addr = (void __user *)address; - force_sig_info(info.si_code, &info, current); - return; - -bad_area: - up_read(&mm->mmap_sem); - - if (user_mode(regs)) { - info.si_signo = SIGSEGV; - info.si_errno = 0; - info.si_code = si_code; - info.si_addr = (void *)address; - force_sig_info(SIGSEGV, &info, current); - return; - } - /* Kernel-mode fault falls through */ - -no_context: - fixup = search_exception_tables(pt_elr(regs)); - if (fixup) { - pt_set_elr(regs, fixup->fixup); - return; - } - - /* Things are looking very, very bad now */ - bust_spinlocks(1); - printk(KERN_EMERG "Unable to handle kernel paging request at " - "virtual address 0x%08lx, regs %p\n", address, regs); - die("Bad Kernel VA", regs, SIGKILL); -} - - -void read_protection_fault(struct pt_regs *regs) -{ - unsigned long badvadr = pt_badva(regs); - - do_page_fault(badvadr, FLT_LOAD, regs); -} - -void write_protection_fault(struct pt_regs *regs) -{ - unsigned long badvadr = pt_badva(regs); - - do_page_fault(badvadr, FLT_STORE, regs); -} - -void execute_protection_fault(struct pt_regs *regs) -{ - unsigned long badvadr = pt_badva(regs); - - do_page_fault(badvadr, FLT_IFETCH, regs); -} |