Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 616 deletions

diff --git a/ANDROID_3.4.5/arch/arm/mm/fault.c b/ANDROID_3.4.5/arch/arm/mm/fault.c
deleted file mode 100644
index 5bb48356..00000000
--- a/ANDROID_3.4.5/arch/arm/mm/fault.c
+++ /dev/null
@@ -1,616 +0,0 @@
-/*
- *  linux/arch/arm/mm/fault.c
- *
- *  Copyright (C) 1995  Linus Torvalds
- *  Modifications for ARM processor (c) 1995-2004 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/module.h>
-#include <linux/signal.h>
-#include <linux/mm.h>
-#include <linux/hardirq.h>
-#include <linux/init.h>
-#include <linux/kprobes.h>
-#include <linux/uaccess.h>
-#include <linux/page-flags.h>
-#include <linux/sched.h>
-#include <linux/highmem.h>
-#include <linux/perf_event.h>
-
-#include <asm/exception.h>
-#include <asm/pgtable.h>
-#include <asm/system_misc.h>
-#include <asm/system_info.h>
-#include <asm/tlbflush.h>
-
-#include "fault.h"
-
-#ifdef CONFIG_MMU
-
-#ifdef CONFIG_KPROBES
-static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
-{
-	int ret = 0;
-
-	if (!user_mode(regs)) {
-		/* kprobe_running() needs smp_processor_id() */
-		preempt_disable();
-		if (kprobe_running() && kprobe_fault_handler(regs, fsr))
-			ret = 1;
-		preempt_enable();
-	}
-
-	return ret;
-}
-#else
-static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
-{
-	return 0;
-}
-#endif
-
-/*
- * This is useful to dump out the page tables associated with
- * 'addr' in mm 'mm'.
- */
-void show_pte(struct mm_struct *mm, unsigned long addr)
-{
-	pgd_t *pgd;
-
-	if (!mm)
-		mm = &init_mm;
-
-	printk(KERN_ALERT "pgd = %p\n", mm->pgd);
-	pgd = pgd_offset(mm, addr);
-	printk(KERN_ALERT "[%08lx] *pgd=%08llx",
-			addr, (long long)pgd_val(*pgd));
-
-	do {
-		pud_t *pud;
-		pmd_t *pmd;
-		pte_t *pte;
-
-		if (pgd_none(*pgd))
-			break;
-
-		if (pgd_bad(*pgd)) {
-			printk("(bad)");
-			break;
-		}
-
-		pud = pud_offset(pgd, addr);
-		if (PTRS_PER_PUD != 1)
-			printk(", *pud=%08llx", (long long)pud_val(*pud));
-
-		if (pud_none(*pud))
-			break;
-
-		if (pud_bad(*pud)) {
-			printk("(bad)");
-			break;
-		}
-
-		pmd = pmd_offset(pud, addr);
-		if (PTRS_PER_PMD != 1)
-			printk(", *pmd=%08llx", (long long)pmd_val(*pmd));
-
-		if (pmd_none(*pmd))
-			break;
-
-		if (pmd_bad(*pmd)) {
-			printk("(bad)");
-			break;
-		}
-
-		/* We must not map this if we have highmem enabled */
-		if (PageHighMem(pfn_to_page(pmd_val(*pmd) >> PAGE_SHIFT)))
-			break;
-
-		pte = pte_offset_map(pmd, addr);
-		printk(", *pte=%08llx", (long long)pte_val(*pte));
-#ifndef CONFIG_ARM_LPAE
-		printk(", *ppte=%08llx",
-		       (long long)pte_val(pte[PTE_HWTABLE_PTRS]));
-#endif
-		pte_unmap(pte);
-	} while(0);
-
-	printk("\n");
-}
-#else					/* CONFIG_MMU */
-void show_pte(struct mm_struct *mm, unsigned long addr)
-{ }
-#endif					/* CONFIG_MMU */
-
-/*
- * Oops.  The kernel tried to access some page that wasn't present.
- */
-static void
-__do_kernel_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
-		  struct pt_regs *regs)
-{
-	/*
-	 * Are we prepared to handle this kernel fault?
-	 */
-	if (fixup_exception(regs))
-		return;
-
-	/*
-	 * No handler, we'll have to terminate things with extreme prejudice.
-	 */
-	bust_spinlocks(1);
-	printk(KERN_ALERT
-		"Unable to handle kernel %s at virtual address %08lx\n",
-		(addr < PAGE_SIZE) ? "NULL pointer dereference" :
-		"paging request", addr);
-
-	show_pte(mm, addr);
-	die("Oops", regs, fsr);
-	bust_spinlocks(0);
-	do_exit(SIGKILL);
-}
-
-/*
- * Something tried to access memory that isn't in our memory map..
- * User mode accesses just cause a SIGSEGV
- */
-static void
-__do_user_fault(struct task_struct *tsk, unsigned long addr,
-		unsigned int fsr, unsigned int sig, int code,
-		struct pt_regs *regs)
-{
-	struct siginfo si;
-
-#ifdef CONFIG_DEBUG_USER
-	if (((user_debug & UDBG_SEGV) && (sig == SIGSEGV)) ||
-	    ((user_debug & UDBG_BUS)  && (sig == SIGBUS))) {
-		printk(KERN_DEBUG "%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",
-		       tsk->comm, sig, addr, fsr);
-		show_pte(tsk->mm, addr);
-		show_regs(regs);
-	}
-#endif
-
-	tsk->thread.address = addr;
-	tsk->thread.error_code = fsr;
-	tsk->thread.trap_no = 14;
-	si.si_signo = sig;
-	si.si_errno = 0;
-	si.si_code = code;
-	si.si_addr = (void __user *)addr;
-	force_sig_info(sig, &si, tsk);
-}
-
-void do_bad_area(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	struct task_struct *tsk = current;
-	struct mm_struct *mm = tsk->active_mm;
-
-	/*
-	 * If we are in kernel mode at this point, we
-	 * have no context to handle this fault with.
-	 */
-	if (user_mode(regs))
-		__do_user_fault(tsk, addr, fsr, SIGSEGV, SEGV_MAPERR, regs);
-	else
-		__do_kernel_fault(mm, addr, fsr, regs);
-}
-
-#ifdef CONFIG_MMU
-#define VM_FAULT_BADMAP		0x010000
-#define VM_FAULT_BADACCESS	0x020000
-
-/*
- * Check that the permissions on the VMA allow for the fault which occurred.
- * If we encountered a write fault, we must have write permission, otherwise
- * we allow any permission.
- */
-static inline bool access_error(unsigned int fsr, struct vm_area_struct *vma)
-{
-	unsigned int mask = VM_READ | VM_WRITE | VM_EXEC;
-
-	if (fsr & FSR_WRITE)
-		mask = VM_WRITE;
-	if (fsr & FSR_LNX_PF)
-		mask = VM_EXEC;
-
-	return vma->vm_flags & mask ? false : true;
-}
-
-static int __kprobes
-__do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
-		unsigned int flags, struct task_struct *tsk)
-{
-	struct vm_area_struct *vma;
-	int fault;
-
-	vma = find_vma(mm, addr);
-	fault = VM_FAULT_BADMAP;
-	if (unlikely(!vma))
-		goto out;
-	if (unlikely(vma->vm_start > addr))
-		goto check_stack;
-
-	/*
-	 * Ok, we have a good vm_area for this
-	 * memory access, so we can handle it.
-	 */
-good_area:
-	if (access_error(fsr, vma)) {
-		fault = VM_FAULT_BADACCESS;
-		goto out;
-	}
-
-	return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
-
-check_stack:
-	/* Don't allow expansion below FIRST_USER_ADDRESS */
-	if (vma->vm_flags & VM_GROWSDOWN &&
-	    addr >= FIRST_USER_ADDRESS && !expand_stack(vma, addr))
-		goto good_area;
-out:
-	return fault;
-}
-
-static int __kprobes
-do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	struct task_struct *tsk;
-	struct mm_struct *mm;
-	int fault, sig, code;
-	int write = fsr & FSR_WRITE;
-	unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE |
-				(write ? FAULT_FLAG_WRITE : 0);
-
-	if (notify_page_fault(regs, fsr))
-		return 0;
-
-	tsk = current;
-	mm  = tsk->mm;
-
-	/* Enable interrupts if they were enabled in the parent context. */
-	if (interrupts_enabled(regs))
-		local_irq_enable();
-
-	/*
-	 * If we're in an interrupt or have no user
-	 * context, we must not take the fault..
-	 */
-	if (in_atomic() || !mm)
-		goto no_context;
-
-	/*
-	 * As per x86, we may deadlock here.  However, since the kernel only
-	 * validly references user space from well defined areas of the code,
-	 * we can bug out early if this is from code which shouldn't.
-	 */
-	if (!down_read_trylock(&mm->mmap_sem)) {
-		if (!user_mode(regs) && !search_exception_tables(regs->ARM_pc))
-			goto no_context;
-retry:
-		down_read(&mm->mmap_sem);
-	} else {
-		/*
-		 * The above down_read_trylock() might have succeeded in
-		 * which case, we'll have missed the might_sleep() from
-		 * down_read()
-		 */
-		might_sleep();
-#ifdef CONFIG_DEBUG_VM
-		if (!user_mode(regs) &&
-		    !search_exception_tables(regs->ARM_pc))
-			goto no_context;
-#endif
-	}
-
-	fault = __do_page_fault(mm, addr, fsr, flags, tsk);
-
-	/* If we need to retry but a fatal signal is pending, handle the
-	 * signal first. We do not need to release the mmap_sem because
-	 * it would already be released in __lock_page_or_retry in
-	 * mm/filemap.c. */
-	if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current))
-		return 0;
-
-	/*
-	 * Major/minor page fault accounting is only done on the
-	 * initial attempt. If we go through a retry, it is extremely
-	 * likely that the page will be found in page cache at that point.
-	 */
-
-	perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, regs, addr);
-	if (!(fault & VM_FAULT_ERROR) && flags & FAULT_FLAG_ALLOW_RETRY) {
-		if (fault & VM_FAULT_MAJOR) {
-			tsk->maj_flt++;
-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MAJ, 1,
-					regs, addr);
-		} else {
-			tsk->min_flt++;
-			perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS_MIN, 1,
-					regs, addr);
-		}
-		if (fault & VM_FAULT_RETRY) {
-			/* Clear FAULT_FLAG_ALLOW_RETRY to avoid any risk
-			* of starvation. */
-			flags &= ~FAULT_FLAG_ALLOW_RETRY;
-			goto retry;
-		}
-	}
-
-	up_read(&mm->mmap_sem);
-
-	/*
-	 * Handle the "normal" case first - VM_FAULT_MAJOR / VM_FAULT_MINOR
-	 */
-	if (likely(!(fault & (VM_FAULT_ERROR | VM_FAULT_BADMAP | VM_FAULT_BADACCESS))))
-		return 0;
-
-	if (fault & VM_FAULT_OOM) {
-		/*
-		 * We ran out of memory, call the OOM killer, and return to
-		 * userspace (which will retry the fault, or kill us if we
-		 * got oom-killed)
-		 */
-		pagefault_out_of_memory();
-		return 0;
-	}
-
-	/*
-	 * If we are in kernel mode at this point, we
-	 * have no context to handle this fault with.
-	 */
-	if (!user_mode(regs))
-		goto no_context;
-
-	if (fault & VM_FAULT_SIGBUS) {
-		/*
-		 * We had some memory, but were unable to
-		 * successfully fix up this page fault.
-		 */
-		sig = SIGBUS;
-		code = BUS_ADRERR;
-	} else {
-		/*
-		 * Something tried to access memory that
-		 * isn't in our memory map..
-		 */
-		sig = SIGSEGV;
-		code = fault == VM_FAULT_BADACCESS ?
-			SEGV_ACCERR : SEGV_MAPERR;
-	}
-
-	__do_user_fault(tsk, addr, fsr, sig, code, regs);
-	return 0;
-
-no_context:
-	__do_kernel_fault(mm, addr, fsr, regs);
-	return 0;
-}
-#else					/* CONFIG_MMU */
-static int
-do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	return 0;
-}
-#endif					/* CONFIG_MMU */
-
-/*
- * First Level Translation Fault Handler
- *
- * We enter here because the first level page table doesn't contain
- * a valid entry for the address.
- *
- * If the address is in kernel space (>= TASK_SIZE), then we are
- * probably faulting in the vmalloc() area.
- *
- * If the init_task's first level page tables contains the relevant
- * entry, we copy the it to this task.  If not, we send the process
- * a signal, fixup the exception, or oops the kernel.
- *
- * NOTE! We MUST NOT take any locks for this case. We may be in an
- * interrupt or a critical region, and should only copy the information
- * from the master page table, nothing more.
- */
-#ifdef CONFIG_MMU
-static int __kprobes
-do_translation_fault(unsigned long addr, unsigned int fsr,
-		     struct pt_regs *regs)
-{
-	unsigned int index;
-	pgd_t *pgd, *pgd_k;
-	pud_t *pud, *pud_k;
-	pmd_t *pmd, *pmd_k;
-
-	if (addr < TASK_SIZE)
-		return do_page_fault(addr, fsr, regs);
-
-	if (user_mode(regs))
-		goto bad_area;
-
-	index = pgd_index(addr);
-
-	/*
-	 * FIXME: CP15 C1 is write only on ARMv3 architectures.
-	 */
-	pgd = cpu_get_pgd() + index;
-	pgd_k = init_mm.pgd + index;
-
-	if (pgd_none(*pgd_k))
-		goto bad_area;
-	if (!pgd_present(*pgd))
-		set_pgd(pgd, *pgd_k);
-
-	pud = pud_offset(pgd, addr);
-	pud_k = pud_offset(pgd_k, addr);
-
-	if (pud_none(*pud_k))
-		goto bad_area;
-	if (!pud_present(*pud))
-		set_pud(pud, *pud_k);
-
-	pmd = pmd_offset(pud, addr);
-	pmd_k = pmd_offset(pud_k, addr);
-
-#ifdef CONFIG_ARM_LPAE
-	/*
-	 * Only one hardware entry per PMD with LPAE.
-	 */
-	index = 0;
-#else
-	/*
-	 * On ARM one Linux PGD entry contains two hardware entries (see page
-	 * tables layout in pgtable.h). We normally guarantee that we always
-	 * fill both L1 entries. But create_mapping() doesn't follow the rule.
-	 * It can create inidividual L1 entries, so here we have to call
-	 * pmd_none() check for the entry really corresponded to address, not
-	 * for the first of pair.
-	 */
-	index = (addr >> SECTION_SHIFT) & 1;
-#endif
-	if (pmd_none(pmd_k[index]))
-		goto bad_area;
-
-	copy_pmd(pmd, pmd_k);
-	return 0;
-
-bad_area:
-	do_bad_area(addr, fsr, regs);
-	return 0;
-}
-#else					/* CONFIG_MMU */
-static int
-do_translation_fault(unsigned long addr, unsigned int fsr,
-		     struct pt_regs *regs)
-{
-	return 0;
-}
-#endif					/* CONFIG_MMU */
-
-/*
- * Some section permission faults need to be handled gracefully.
- * They can happen due to a __{get,put}_user during an oops.
- */
-static int
-do_sect_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	do_bad_area(addr, fsr, regs);
-	return 0;
-}
-
-/*
- * This abort handler always returns "fault".
- */
-static int
-do_bad(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	return 1;
-}
-
-struct fsr_info {
-	int	(*fn)(unsigned long addr, unsigned int fsr, struct pt_regs *regs);
-	int	sig;
-	int	code;
-	const char *name;
-};
-
-/* FSR definition */
-#ifdef CONFIG_ARM_LPAE
-#include "fsr-3level.c"
-#else
-#include "fsr-2level.c"
-#endif
-
-void __init
-hook_fault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
-		int sig, int code, const char *name)
-{
-	if (nr < 0 || nr >= ARRAY_SIZE(fsr_info))
-		BUG();
-
-	fsr_info[nr].fn   = fn;
-	fsr_info[nr].sig  = sig;
-	fsr_info[nr].code = code;
-	fsr_info[nr].name = name;
-}
-
-/*
- * Dispatch a data abort to the relevant handler.
- */
-asmlinkage void __exception
-do_DataAbort(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
-{
-	const struct fsr_info *inf = fsr_info + fsr_fs(fsr);
-	struct siginfo info;
-
-	if (!inf->fn(addr, fsr & ~FSR_LNX_PF, regs))
-		return;
-
-	printk(KERN_ALERT "Unhandled fault: %s (0x%03x) at 0x%08lx\n",
-		inf->name, fsr, addr);
-
-	info.si_signo = inf->sig;
-	info.si_errno = 0;
-	info.si_code  = inf->code;
-	info.si_addr  = (void __user *)addr;
-	arm_notify_die("", regs, &info, fsr, 0);
-}
-
-void __init
-hook_ifault_code(int nr, int (*fn)(unsigned long, unsigned int, struct pt_regs *),
-		 int sig, int code, const char *name)
-{
-	if (nr < 0 || nr >= ARRAY_SIZE(ifsr_info))
-		BUG();
-
-	ifsr_info[nr].fn   = fn;
-	ifsr_info[nr].sig  = sig;
-	ifsr_info[nr].code = code;
-	ifsr_info[nr].name = name;
-}
-
-asmlinkage void __exception
-do_PrefetchAbort(unsigned long addr, unsigned int ifsr, struct pt_regs *regs)
-{
-	const struct fsr_info *inf = ifsr_info + fsr_fs(ifsr);
-	struct siginfo info;
-
-	if (!inf->fn(addr, ifsr | FSR_LNX_PF, regs))
-		return;
-
-	printk(KERN_ALERT "Unhandled prefetch abort: %s (0x%03x) at 0x%08lx\n",
-		inf->name, ifsr, addr);
-
-	info.si_signo = inf->sig;
-	info.si_errno = 0;
-	info.si_code  = inf->code;
-	info.si_addr  = (void __user *)addr;
-	arm_notify_die("", regs, &info, ifsr, 0);
-}
-
-#ifndef CONFIG_ARM_LPAE
-static int __init exceptions_init(void)
-{
-	if (cpu_architecture() >= CPU_ARCH_ARMv6) {
-		hook_fault_code(4, do_translation_fault, SIGSEGV, SEGV_MAPERR,
-				"I-cache maintenance fault");
-	}
-
-	if (cpu_architecture() >= CPU_ARCH_ARMv7) {
-		/*
-		 * TODO: Access flag faults introduced in ARMv6K.
-		 * Runtime check for 'K' extension is needed
-		 */
-		hook_fault_code(3, do_bad, SIGSEGV, SEGV_MAPERR,
-				"section access flag fault");
-		hook_fault_code(6, do_bad, SIGSEGV, SEGV_MAPERR,
-				"section access flag fault");
-	}
-
-	return 0;
-}
-
-arch_initcall(exceptions_init);
-#endif