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/*
 * include/asm-xtensa/uaccess.h
 *
 * User space memory access functions
 *
 * These routines provide basic accessing functions to the user memory
 * space for the kernel. This header file provides functions such as:
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2005 Tensilica Inc.
 */

#ifndef _XTENSA_UACCESS_H
#define _XTENSA_UACCESS_H

#include <linux/prefetch.h>
#include <asm/types.h>
#include <asm/extable.h>

/*
 * The fs value determines whether argument validity checking should
 * be performed or not.  If get_fs() == USER_DS, checking is
 * performed, with get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons (Data Segment Register?), these macros are
 * grossly misnamed.
 */

#define KERNEL_DS	((mm_segment_t) { 0 })
#define USER_DS		((mm_segment_t) { 1 })

#define get_ds()	(KERNEL_DS)
#define get_fs()	(current->thread.current_ds)
#define set_fs(val)	(current->thread.current_ds = (val))

#define segment_eq(a, b)	((a).seg == (b).seg)

#define __kernel_ok (uaccess_kernel())
#define __user_ok(addr, size) \
		(((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
#define __access_ok(addr, size) (__kernel_ok || __user_ok((addr), (size)))
#define access_ok(type, addr, size) __access_ok((unsigned long)(addr), (size))

/*
 * These are the main single-value transfer routines.  They
 * automatically use the right size if we just have the right pointer
 * type.
 *
 * This gets kind of ugly. We want to return _two_ values in
 * "get_user()" and yet we don't want to do any pointers, because that
 * is too much of a performance impact. Thus we have a few rather ugly
 * macros here, and hide all the uglyness from the user.
 *
 * Careful to not
 * (a) re-use the arguments for side effects (sizeof is ok)
 * (b) require any knowledge of processes at this stage
 */
#define put_user(x, ptr)	__put_user_check((x), (ptr), sizeof(*(ptr)))
#define get_user(x, ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * The "__xxx" versions of the user access functions are versions that
 * do not verify the address space, that must have been done previously
 * with a separate "access_ok()" call (this is used when we do multiple
 * accesses to the same area of user memory).
 */
#define __put_user(x, ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
#define __get_user(x, ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))


extern long __put_user_bad(void);

#define __put_user_nocheck(x, ptr, size)		\
({							\
	long __pu_err;					\
	__put_user_size((x), (ptr), (size), __pu_err);	\
	__pu_err;					\
})

#define __put_user_check(x, ptr, size)					\
({									\
	long __pu_err = -EFAULT;					\
	__typeof__(*(ptr)) *__pu_addr = (ptr);				\
	if (access_ok(VERIFY_WRITE, __pu_addr, size))			\
		__put_user_size((x), __pu_addr, (size), __pu_err);	\
	__pu_err;							\
})

#define __put_user_size(x, ptr, size, retval)				\
do {									\
	int __cb;							\
	retval = 0;							\
	switch (size) {							\
	case 1: __put_user_asm(x, ptr, retval, 1, "s8i", __cb);  break;	\
	case 2: __put_user_asm(x, ptr, retval, 2, "s16i", __cb); break;	\
	case 4: __put_user_asm(x, ptr, retval, 4, "s32i", __cb); break;	\
	case 8: {							\
		     __typeof__(*ptr) __v64 = x;			\
		     retval = __copy_to_user(ptr, &__v64, 8);		\
		     break;						\
	        }							\
	default: __put_user_bad();					\
	}								\
} while (0)


/*
 * Consider a case of a user single load/store would cause both an
 * unaligned exception and an MMU-related exception (unaligned
 * exceptions happen first):
 *
 * User code passes a bad variable ptr to a system call.
 * Kernel tries to access the variable.
 * Unaligned exception occurs.
 * Unaligned exception handler tries to make aligned accesses.
 * Double exception occurs for MMU-related cause (e.g., page not mapped).
 * do_page_fault() thinks the fault address belongs to the kernel, not the
 * user, and panics.
 *
 * The kernel currently prohibits user unaligned accesses.  We use the
 * __check_align_* macros to check for unaligned addresses before
 * accessing user space so we don't crash the kernel.  Both
 * __put_user_asm and __get_user_asm use these alignment macros, so
 * macro-specific labels such as 0f, 1f, %0, %2, and %3 must stay in
 * sync.
 */

#define __check_align_1  ""

#define __check_align_2				\
	"   _bbci.l %3,  0, 1f		\n"	\
	"   movi    %0, %4		\n"	\
	"   _j      2f			\n"

#define __check_align_4				\
	"   _bbsi.l %3,  0, 0f		\n"	\
	"   _bbci.l %3,  1, 1f		\n"	\
	"0: movi    %0, %4		\n"	\
	"   _j      2f			\n"


/*
 * We don't tell gcc that we are accessing memory, but this is OK
 * because we do not write to any memory gcc knows about, so there
 * are no aliasing issues.
 *
 * WARNING: If you modify this macro at all, verify that the
 * __check_align_* macros still work.
 */
#define __put_user_asm(x, addr, err, align, insn, cb)	\
__asm__ __volatile__(					\
	__check_align_##align				\
	"1: "insn"  %2, %3, 0		\n"		\
	"2:				\n"		\
	"   .section  .fixup,\"ax\"	\n"		\
	"   .align 4			\n"		\
	"4:				\n"		\
	"   .long  2b			\n"		\
	"5:				\n"		\
	"   l32r   %1, 4b		\n"		\
	"   movi   %0, %4		\n"		\
	"   jx     %1			\n"		\
	"   .previous			\n"		\
	"   .section  __ex_table,\"a\"	\n"		\
	"   .long	1b, 5b		\n"		\
	"   .previous"					\
	:"=r" (err), "=r" (cb)				\
	:"r" ((int)(x)), "r" (addr), "i" (-EFAULT), "0" (err))

#define __get_user_nocheck(x, ptr, size)			\
({								\
	long __gu_err, __gu_val;				\
	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;		\
	__gu_err;						\
})

#define __get_user_check(x, ptr, size)					\
({									\
	long __gu_err = -EFAULT, __gu_val = 0;				\
	const __typeof__(*(ptr)) *__gu_addr = (ptr);			\
	if (access_ok(VERIFY_READ, __gu_addr, size))			\
		__get_user_size(__gu_val, __gu_addr, (size), __gu_err);	\
	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
	__gu_err;							\
})

extern long __get_user_bad(void);

#define __get_user_size(x, ptr, size, retval)				\
do {									\
	int __cb;							\
	retval = 0;							\
	switch (size) {							\
	case 1: __get_user_asm(x, ptr, retval, 1, "l8ui", __cb);  break;\
	case 2: __get_user_asm(x, ptr, retval, 2, "l16ui", __cb); break;\
	case 4: __get_user_asm(x, ptr, retval, 4, "l32i", __cb);  break;\
	case 8: retval = __copy_from_user(&x, ptr, 8);    break;	\
	default: (x) = __get_user_bad();				\
	}								\
} while (0)


/*
 * WARNING: If you modify this macro at all, verify that the
 * __check_align_* macros still work.
 */
#define __get_user_asm(x, addr, err, align, insn, cb) \
__asm__ __volatile__(			\
	__check_align_##align			\
	"1: "insn"  %2, %3, 0		\n"	\
	"2:				\n"	\
	"   .section  .fixup,\"ax\"	\n"	\
	"   .align 4			\n"	\
	"4:				\n"	\
	"   .long  2b			\n"	\
	"5:				\n"	\
	"   l32r   %1, 4b		\n"	\
	"   movi   %2, 0		\n"	\
	"   movi   %0, %4		\n"	\
	"   jx     %1			\n"	\
	"   .previous			\n"	\
	"   .section  __ex_table,\"a\"	\n"	\
	"   .long	1b, 5b		\n"	\
	"   .previous"				\
	:"=r" (err), "=r" (cb), "=r" (x)	\
	:"r" (addr), "i" (-EFAULT), "0" (err))


/*
 * Copy to/from user space
 */

extern unsigned __xtensa_copy_user(void *to, const void *from, unsigned n);

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n)
{
	prefetchw(to);
	return __xtensa_copy_user(to, (__force const void *)from, n);
}
static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n)
{
	prefetch(from);
	return __xtensa_copy_user((__force void *)to, from, n);
}
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

/*
 * We need to return the number of bytes not cleared.  Our memset()
 * returns zero if a problem occurs while accessing user-space memory.
 * In that event, return no memory cleared.  Otherwise, zero for
 * success.
 */

static inline unsigned long
__xtensa_clear_user(void *addr, unsigned long size)
{
	if ( ! memset(addr, 0, size) )
		return size;
	return 0;
}

static inline unsigned long
clear_user(void *addr, unsigned long size)
{
	if (access_ok(VERIFY_WRITE, addr, size))
		return __xtensa_clear_user(addr, size);
	return size ? -EFAULT : 0;
}

#define __clear_user  __xtensa_clear_user


extern long __strncpy_user(char *, const char *, long);

static inline long
strncpy_from_user(char *dst, const char *src, long count)
{
	if (access_ok(VERIFY_READ, src, 1))
		return __strncpy_user(dst, src, count);
	return -EFAULT;
}

/*
 * Return the size of a string (including the ending 0!)
 */
extern long __strnlen_user(const char *, long);

static inline long strnlen_user(const char *str, long len)
{
	unsigned long top = __kernel_ok ? ~0UL : TASK_SIZE - 1;

	if ((unsigned long)str > top)
		return 0;
	return __strnlen_user(str, len);
}

#endif	/* _XTENSA_UACCESS_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 685 B 0644
asm-offsets.h File 35 B 0644
asm-uaccess.h File 4.11 KB 0644
asmmacro.h File 2.76 KB 0644
atomic.h File 7.38 KB 0644
barrier.h File 542 B 0644
bitops.h File 5.08 KB 0644
bootparam.h File 1.37 KB 0644
bugs.h File 451 B 0644
cache.h File 969 B 0644
cacheasm.h File 3.77 KB 0644
cacheflush.h File 5.76 KB 0644
checksum.h File 6 KB 0644
cmpxchg.h File 3.9 KB 0644
coprocessor.h File 5.05 KB 0644
current.h File 675 B 0644
delay.h File 1.63 KB 0644
dma-mapping.h File 855 B 0644
dma.h File 1.79 KB 0644
elf.h File 5.75 KB 0644
fixmap.h File 2.5 KB 0644
flat.h File 686 B 0644
ftrace.h File 979 B 0644
futex.h File 2.59 KB 0644
highmem.h File 2.33 KB 0644
hw_breakpoint.h File 1.45 KB 0644
hw_irq.h File 320 B 0644
initialize_mmu.h File 4.58 KB 0644
io.h File 2.09 KB 0644
irq.h File 1.46 KB 0644
irqflags.h File 1.99 KB 0644
kmem_layout.h File 2.07 KB 0644
mmu.h File 462 B 0644
mmu_context.h File 3.62 KB 0644
module.h File 525 B 0644
mxregs.h File 1.3 KB 0644
nommu_context.h File 602 B 0644
page.h File 5.69 KB 0644
pci-bridge.h File 2.16 KB 0644
pci.h File 1.37 KB 0644
perf_event.h File 108 B 0644
pgalloc.h File 1.84 KB 0644
pgtable.h File 14.89 KB 0644
platform.h File 1.75 KB 0644
processor.h File 7.44 KB 0644
ptrace.h File 3.74 KB 0644
regs.h File 3.87 KB 0644
segment.h File 376 B 0644
serial.h File 443 B 0644
shmparam.h File 561 B 0644
signal.h File 502 B 0644
smp.h File 967 B 0644
spinlock.h File 4.6 KB 0644
spinlock_types.h File 412 B 0644
stacktrace.h File 1.13 KB 0644
string.h File 2.65 KB 0644
switch_to.h File 601 B 0644
syscall.h File 982 B 0644
sysmem.h File 426 B 0644
thread_info.h File 3.62 KB 0644
timex.h File 1.79 KB 0644
tlb.h File 1.1 KB 0644
tlbflush.h File 5.53 KB 0644
traps.h File 1.87 KB 0644
types.h File 501 B 0644
uaccess.h File 8.67 KB 0644
ucontext.h File 540 B 0644
unaligned.h File 864 B 0644
unistd.h File 639 B 0644
user.h File 507 B 0644
vectors.h File 4.05 KB 0644
vga.h File 434 B 0644