Exemplos de update_mm em C++ (Cpp)

Exemplo n.º 1

Arquivo: fault.c Projeto: turter99/android_kernel_samsung_jaltektt_perseus_4.2.2

void __kprobes do_asce_exception(struct pt_regs *regs)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma;
	unsigned long trans_exc_code;

	trans_exc_code = regs->int_parm_long;
	if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
		goto no_context;

	down_read(&mm->mmap_sem);
	vma = find_vma(mm, trans_exc_code & __FAIL_ADDR_MASK);
	up_read(&mm->mmap_sem);

	if (vma) {
		update_mm(mm, current);
		return;
	}

	/* User mode accesses just cause a SIGSEGV */
	if (regs->psw.mask & PSW_MASK_PSTATE) {
		do_sigsegv(regs, SEGV_MAPERR);
		return;
	}

no_context:
	do_no_context(regs);
}

Exemplo n.º 2

Arquivo: fault.c Projeto: 1n00bB/android_kernel_lenovo_a6010

void __kprobes do_asce_exception(struct pt_regs *regs)
{
	struct mm_struct *mm = current->mm;
	struct vm_area_struct *vma;
	unsigned long trans_exc_code;

	/*
	 * The instruction that caused the program check has
	 * been nullified. Don't signal single step via SIGTRAP.
	 */
	clear_tsk_thread_flag(current, TIF_PER_TRAP);

	trans_exc_code = regs->int_parm_long;
	if (unlikely(!user_space_fault(trans_exc_code) || in_atomic() || !mm))
		goto no_context;

	down_read(&mm->mmap_sem);
	vma = find_vma(mm, trans_exc_code & __FAIL_ADDR_MASK);
	up_read(&mm->mmap_sem);

	if (vma) {
		update_mm(mm, current);
		return;
	}

	/* User mode accesses just cause a SIGSEGV */
	if (user_mode(regs)) {
		do_sigsegv(regs, SEGV_MAPERR);
		return;
	}

no_context:
	do_no_context(regs);
}

Exemplo n.º 3

Arquivo: pgtable.c Projeto: mobilipia/iods

void crst_table_downgrade(struct mm_struct *mm, unsigned long limit)
{
	pgd_t *pgd;

	if (mm->context.asce_limit <= limit)
		return;
	__tlb_flush_mm(mm);
	while (mm->context.asce_limit > limit) {
		pgd = mm->pgd;
		switch (pgd_val(*pgd) & _REGION_ENTRY_TYPE_MASK) {
		case _REGION_ENTRY_TYPE_R2:
			mm->context.asce_limit = 1UL << 42;
			mm->context.asce_bits = _ASCE_TABLE_LENGTH |
						_ASCE_USER_BITS |
						_ASCE_TYPE_REGION3;
			break;
		case _REGION_ENTRY_TYPE_R3:
			mm->context.asce_limit = 1UL << 31;
			mm->context.asce_bits = _ASCE_TABLE_LENGTH |
						_ASCE_USER_BITS |
						_ASCE_TYPE_SEGMENT;
			break;
		default:
			BUG();
		}
		mm->pgd = (pgd_t *) (pgd_val(*pgd) & _REGION_ENTRY_ORIGIN);
		crst_table_free(mm, (unsigned long *) pgd);
	}
	update_mm(mm, current);
}

Exemplo n.º 4

Arquivo: mmap.c Projeto: TheDudeWithThreeHands/ubuntu-precise-lowlatency

int s390_mmap_check(unsigned long addr, unsigned long len)
{
	int rc;

	if (!is_compat_task() &&
	    len >= TASK_SIZE && TASK_SIZE < (1UL << 53)) {
		rc = crst_table_upgrade(current->mm, 1UL << 53);
		if (rc)
			return rc;
		update_mm(current->mm, current);
	}
	return 0;
}

Exemplo n.º 5

Arquivo: mmap.c Projeto: 03199618/linux

int s390_mmap_check(unsigned long addr, unsigned long len, unsigned long flags)
{
	int rc;

	if (is_compat_task() || (TASK_SIZE >= (1UL << 53)))
		return 0;
	if (!(flags & MAP_FIXED))
		addr = 0;
	if ((addr + len) >= TASK_SIZE) {
		rc = crst_table_upgrade(current->mm, 1UL << 53);
		if (rc)
			return rc;
		update_mm(current->mm, current);
	}
	return 0;
}

Exemplo n.º 6

Arquivo: mmap.c Projeto: 03199618/linux

static unsigned long
s390_get_unmapped_area(struct file *filp, unsigned long addr,
		unsigned long len, unsigned long pgoff, unsigned long flags)
{
	struct mm_struct *mm = current->mm;
	unsigned long area;
	int rc;

	area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
	if (!(area & ~PAGE_MASK))
		return area;
	if (area == -ENOMEM && !is_compat_task() && TASK_SIZE < (1UL << 53)) {
		/* Upgrade the page table to 4 levels and retry. */
		rc = crst_table_upgrade(mm, 1UL << 53);
		if (rc)
			return (unsigned long) rc;
		update_mm(mm, current);
		area = arch_get_unmapped_area(filp, addr, len, pgoff, flags);
	}
	return area;
}

Exemplo n.º 7

Arquivo: pgtable.c Projeto: mobilipia/iods

int crst_table_upgrade(struct mm_struct *mm, unsigned long limit)
{
	unsigned long *table, *pgd;
	unsigned long entry;

	BUG_ON(limit > (1UL << 53));
repeat:
	table = crst_table_alloc(mm, mm->context.noexec);
	if (!table)
		return -ENOMEM;
	spin_lock(&mm->page_table_lock);
	if (mm->context.asce_limit < limit) {
		pgd = (unsigned long *) mm->pgd;
		if (mm->context.asce_limit <= (1UL << 31)) {
			entry = _REGION3_ENTRY_EMPTY;
			mm->context.asce_limit = 1UL << 42;
			mm->context.asce_bits = _ASCE_TABLE_LENGTH |
						_ASCE_USER_BITS |
						_ASCE_TYPE_REGION3;
		} else {
			entry = _REGION2_ENTRY_EMPTY;
			mm->context.asce_limit = 1UL << 53;
			mm->context.asce_bits = _ASCE_TABLE_LENGTH |
						_ASCE_USER_BITS |
						_ASCE_TYPE_REGION2;
		}
		crst_table_init(table, entry);
		pgd_populate(mm, (pgd_t *) table, (pud_t *) pgd);
		mm->pgd = (pgd_t *) table;
		table = NULL;
	}
	spin_unlock(&mm->page_table_lock);
	if (table)
		crst_table_free(mm, table);
	if (mm->context.asce_limit < limit)
		goto repeat;
	update_mm(mm, current);
	return 0;
}