270 lines
7.0 KiB
C
270 lines
7.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2008-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*/
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#ifndef _ASM_MICROBLAZE_UACCESS_H
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#define _ASM_MICROBLAZE_UACCESS_H
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#include <linux/kernel.h>
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#include <asm/mmu.h>
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#include <asm/page.h>
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#include <linux/pgtable.h>
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#include <asm/extable.h>
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#include <linux/string.h>
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#include <asm-generic/access_ok.h>
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# define __FIXUP_SECTION ".section .fixup,\"ax\"\n"
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# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
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extern unsigned long __copy_tofrom_user(void __user *to,
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const void __user *from, unsigned long size);
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/* Return: number of not copied bytes, i.e. 0 if OK or non-zero if fail. */
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static inline unsigned long __must_check __clear_user(void __user *to,
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unsigned long n)
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{
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/* normal memset with two words to __ex_table */
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__asm__ __volatile__ ( \
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"1: sb r0, %1, r0;" \
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" addik %0, %0, -1;" \
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" bneid %0, 1b;" \
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" addik %1, %1, 1;" \
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"2: " \
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__EX_TABLE_SECTION \
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".word 1b,2b;" \
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".previous;" \
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: "=r"(n), "=r"(to) \
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: "0"(n), "1"(to)
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);
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return n;
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}
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static inline unsigned long __must_check clear_user(void __user *to,
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unsigned long n)
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{
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might_fault();
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if (unlikely(!access_ok(to, n)))
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return n;
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return __clear_user(to, n);
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}
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/* put_user and get_user macros */
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extern long __user_bad(void);
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#define __get_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0;" \
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" addk %0, r0, r0;" \
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"2: " \
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__FIXUP_SECTION \
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"3: brid 2b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,3b;" \
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".previous;" \
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: "=&r"(__gu_err), "=r"(__gu_val) \
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: "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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/**
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* get_user: - Get a simple variable from user space.
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and the result of
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* dereferencing @ptr must be assignable to @x without a cast.
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*
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* Returns zero on success, or -EFAULT on error.
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* On error, the variable @x is set to zero.
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*/
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#define get_user(x, ptr) ({ \
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const typeof(*(ptr)) __user *__gu_ptr = (ptr); \
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access_ok(__gu_ptr, sizeof(*__gu_ptr)) ? \
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__get_user(x, __gu_ptr) : -EFAULT; \
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})
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#define __get_user(x, ptr) \
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({ \
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long __gu_err; \
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switch (sizeof(*(ptr))) { \
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case 1: \
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__get_user_asm("lbu", (ptr), x, __gu_err); \
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break; \
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case 2: \
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__get_user_asm("lhu", (ptr), x, __gu_err); \
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break; \
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case 4: \
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__get_user_asm("lw", (ptr), x, __gu_err); \
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break; \
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case 8: { \
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__u64 __x = 0; \
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__gu_err = raw_copy_from_user(&__x, ptr, 8) ? \
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-EFAULT : 0; \
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(x) = (typeof(x))(typeof((x) - (x)))__x; \
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break; \
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} \
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default: \
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/* __gu_val = 0; __gu_err = -EINVAL;*/ __gu_err = __user_bad();\
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} \
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__gu_err; \
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})
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#define __put_user_asm(insn, __gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ ( \
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"1:" insn " %1, %2, r0;" \
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" addk %0, r0, r0;" \
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"2: " \
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__FIXUP_SECTION \
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"3: brid 2b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,3b;" \
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".previous;" \
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: "=&r"(__gu_err) \
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: "r"(__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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#define __put_user_asm_8(__gu_ptr, __gu_val, __gu_err) \
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({ \
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__asm__ __volatile__ (" lwi %0, %1, 0;" \
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"1: swi %0, %2, 0;" \
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" lwi %0, %1, 4;" \
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"2: swi %0, %2, 4;" \
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" addk %0, r0, r0;" \
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"3: " \
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__FIXUP_SECTION \
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"4: brid 3b;" \
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" addik %0, r0, %3;" \
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".previous;" \
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__EX_TABLE_SECTION \
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".word 1b,4b,2b,4b;" \
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".previous;" \
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: "=&r"(__gu_err) \
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: "r"(&__gu_val), "r"(__gu_ptr), "i"(-EFAULT) \
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); \
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})
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/**
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* put_user: - Write a simple value into user space.
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* data types like structures or arrays.
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*
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* @ptr must have pointer-to-simple-variable type, and @x must be assignable
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* to the result of dereferencing @ptr.
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*
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* Returns zero on success, or -EFAULT on error.
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*/
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#define put_user(x, ptr) \
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__put_user_check((x), (ptr), sizeof(*(ptr)))
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#define __put_user_check(x, ptr, size) \
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({ \
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typeof(*(ptr)) volatile __pu_val = x; \
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typeof(*(ptr)) __user *__pu_addr = (ptr); \
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int __pu_err = 0; \
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\
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if (access_ok(__pu_addr, size)) { \
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switch (size) { \
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case 1: \
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__put_user_asm("sb", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 2: \
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__put_user_asm("sh", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 4: \
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__put_user_asm("sw", __pu_addr, __pu_val, \
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__pu_err); \
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break; \
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case 8: \
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__put_user_asm_8(__pu_addr, __pu_val, __pu_err);\
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break; \
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default: \
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__pu_err = __user_bad(); \
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break; \
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} \
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} else { \
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__pu_err = -EFAULT; \
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} \
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__pu_err; \
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})
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#define __put_user(x, ptr) \
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({ \
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__typeof__(*(ptr)) volatile __gu_val = (x); \
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long __gu_err = 0; \
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switch (sizeof(__gu_val)) { \
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case 1: \
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__put_user_asm("sb", (ptr), __gu_val, __gu_err); \
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break; \
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case 2: \
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__put_user_asm("sh", (ptr), __gu_val, __gu_err); \
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break; \
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case 4: \
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__put_user_asm("sw", (ptr), __gu_val, __gu_err); \
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break; \
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case 8: \
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__put_user_asm_8((ptr), __gu_val, __gu_err); \
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break; \
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default: \
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/*__gu_err = -EINVAL;*/ __gu_err = __user_bad(); \
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} \
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__gu_err; \
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})
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static inline unsigned long
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raw_copy_from_user(void *to, const void __user *from, unsigned long n)
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{
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return __copy_tofrom_user((__force void __user *)to, from, n);
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}
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static inline unsigned long
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raw_copy_to_user(void __user *to, const void *from, unsigned long n)
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{
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return __copy_tofrom_user(to, (__force const void __user *)from, n);
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}
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#define INLINE_COPY_FROM_USER
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#define INLINE_COPY_TO_USER
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/*
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* Copy a null terminated string from userspace.
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*/
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__must_check long strncpy_from_user(char *dst, const char __user *src,
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long count);
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/*
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* Return the size of a string (including the ending 0)
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*
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* Return 0 on exception, a value greater than N if too long
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*/
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__must_check long strnlen_user(const char __user *sstr, long len);
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#endif /* _ASM_MICROBLAZE_UACCESS_H */
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