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/*
 * User space memory access functions for Nios II
 *
 * Copyright (C) 2010-2011, Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2009, Wind River Systems Inc
 *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
 *
 * 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.
 */

#ifndef _ASM_NIOS2_UACCESS_H
#define _ASM_NIOS2_UACCESS_H

#include <linux/string.h>

#include <asm/page.h>

#include <asm/extable.h>

/*
 * Segment stuff
 */
#define MAKE_MM_SEG(s)		((mm_segment_t) { (s) })
#define USER_DS			MAKE_MM_SEG(0x80000000UL)
#define KERNEL_DS		MAKE_MM_SEG(0)

#define get_ds()		(KERNEL_DS)

#define get_fs()		(current_thread_info()->addr_limit)
#define set_fs(seg)		(current_thread_info()->addr_limit = (seg))

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

#define __access_ok(addr, len)			\
	(((signed long)(((long)get_fs().seg) &	\
		((long)(addr) | (((long)(addr)) + (len)) | (len)))) == 0)

#define access_ok(type, addr, len)		\
	likely(__access_ok((unsigned long)(addr), (unsigned long)(len)))

# define __EX_TABLE_SECTION	".section __ex_table,\"a\"\n"

#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)

/*
 * Zero Userspace
 */

static inline unsigned long __must_check __clear_user(void __user *to,
						      unsigned long n)
{
	__asm__ __volatile__ (
		"1:     stb     zero, 0(%1)\n"
		"       addi    %0, %0, -1\n"
		"       addi    %1, %1, 1\n"
		"       bne     %0, zero, 1b\n"
		"2:\n"
		__EX_TABLE_SECTION
		".word  1b, 2b\n"
		".previous\n"
		: "=r" (n), "=r" (to)
		: "0" (n), "1" (to)
	);

	return n;
}

static inline unsigned long __must_check clear_user(void __user *to,
						    unsigned long n)
{
	if (!access_ok(VERIFY_WRITE, to, n))
		return n;
	return __clear_user(to, n);
}

extern unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long n);
extern unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long n);
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

extern long strncpy_from_user(char *__to, const char __user *__from,
			      long __len);
extern __must_check long strlen_user(const char __user *str);
extern __must_check long strnlen_user(const char __user *s, long n);

/* Optimized macros */
#define __get_user_asm(val, insn, addr, err)				\
{									\
	__asm__ __volatile__(						\
	"       movi    %0, %3\n"					\
	"1:   " insn " %1, 0(%2)\n"					\
	"       movi     %0, 0\n"					\
	"2:\n"								\
	"       .section __ex_table,\"a\"\n"				\
	"       .word 1b, 2b\n"						\
	"       .previous"						\
	: "=&r" (err), "=r" (val)					\
	: "r" (addr), "i" (-EFAULT));					\
}

#define __get_user_unknown(val, size, ptr, err) do {			\
	err = 0;							\
	if (__copy_from_user(&(val), ptr, size)) {			\
		err = -EFAULT;						\
	}								\
	} while (0)

#define __get_user_common(val, size, ptr, err)				\
do {									\
	switch (size) {							\
	case 1:								\
		__get_user_asm(val, "ldbu", ptr, err);			\
		break;							\
	case 2:								\
		__get_user_asm(val, "ldhu", ptr, err);			\
		break;							\
	case 4:								\
		__get_user_asm(val, "ldw", ptr, err);			\
		break;							\
	default:							\
		__get_user_unknown(val, size, ptr, err);		\
		break;							\
	}								\
} while (0)

#define __get_user(x, ptr)						\
	({								\
	long __gu_err = -EFAULT;					\
	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
	unsigned long __gu_val = 0;					\
	__get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\
	(x) = (__force __typeof__(x))__gu_val;				\
	__gu_err;							\
	})

#define get_user(x, ptr)						\
({									\
	long __gu_err = -EFAULT;					\
	const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);		\
	unsigned long __gu_val = 0;					\
	if (access_ok(VERIFY_READ,  __gu_ptr, sizeof(*__gu_ptr)))	\
		__get_user_common(__gu_val, sizeof(*__gu_ptr),		\
			__gu_ptr, __gu_err);				\
	(x) = (__force __typeof__(x))__gu_val;				\
	__gu_err;							\
})

#define __put_user_asm(val, insn, ptr, err)				\
{									\
	__asm__ __volatile__(						\
	"       movi    %0, %3\n"					\
	"1:   " insn " %1, 0(%2)\n"					\
	"       movi     %0, 0\n"					\
	"2:\n"								\
	"       .section __ex_table,\"a\"\n"				\
	"       .word 1b, 2b\n"						\
	"       .previous\n"						\
	: "=&r" (err)							\
	: "r" (val), "r" (ptr), "i" (-EFAULT));				\
}

#define put_user(x, ptr)						\
({									\
	long __pu_err = -EFAULT;					\
	__typeof__(*(ptr)) __user *__pu_ptr = (ptr);			\
	__typeof__(*(ptr)) __pu_val = (__typeof(*ptr))(x);		\
	if (access_ok(VERIFY_WRITE, __pu_ptr, sizeof(*__pu_ptr))) {	\
		switch (sizeof(*__pu_ptr)) {				\
		case 1:							\
			__put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \
			break;						\
		case 2:							\
			__put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \
			break;						\
		case 4:							\
			__put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \
			break;						\
		default:						\
			/* XXX: This looks wrong... */			\
			__pu_err = 0;					\
			if (copy_to_user(__pu_ptr, &(__pu_val),		\
				sizeof(*__pu_ptr)))			\
				__pu_err = -EFAULT;			\
			break;						\
		}							\
	}								\
	__pu_err;							\
})

#define __put_user(x, ptr) put_user(x, ptr)

#endif /* _ASM_NIOS2_UACCESS_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 958 B 0644
asm-macros.h File 6.71 KB 0644
asm-offsets.h File 813 B 0644
cache.h File 1.14 KB 0644
cacheflush.h File 1.91 KB 0644
checksum.h File 2.03 KB 0644
cpuinfo.h File 1.42 KB 0644
delay.h File 547 B 0644
dma-mapping.h File 547 B 0644
elf.h File 3.2 KB 0644
entry.h File 2.6 KB 0644
io.h File 1.72 KB 0644
irq.h File 907 B 0644
irqflags.h File 1.75 KB 0644
kgdb.h File 1.88 KB 0644
linkage.h File 809 B 0644
mmu.h File 445 B 0644
mmu_context.h File 1.69 KB 0644
page.h File 3.08 KB 0644
pgalloc.h File 1.86 KB 0644
pgtable-bits.h File 1.05 KB 0644
pgtable.h File 7.99 KB 0644
processor.h File 2.18 KB 0644
ptrace.h File 2.29 KB 0644
registers.h File 2.15 KB 0644
setup.h File 1.04 KB 0644
shmparam.h File 804 B 0644
string.h File 618 B 0644
switch_to.h File 866 B 0644
syscall.h File 2.6 KB 0644
syscalls.h File 883 B 0644
thread_info.h File 3.37 KB 0644
timex.h File 912 B 0644
tlb.h File 963 B 0644
tlbflush.h File 1.56 KB 0644
traps.h File 514 B 0644
uaccess.h File 5.18 KB 0644