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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/arch/hexagon/mm/vm_fault.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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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.c187
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);
-}