239 lines
6.7 KiB
C
239 lines
6.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* OpenRISC Linux
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*
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* Linux architectural port borrowing liberally from similar works of
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* others. All original copyrights apply as per the original source
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* declaration.
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*
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* OpenRISC implementation:
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* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
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* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
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* et al.
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*/
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#ifndef __ASM_OPENRISC_UACCESS_H
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#define __ASM_OPENRISC_UACCESS_H
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/*
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* User space memory access functions
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*/
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#include <linux/prefetch.h>
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#include <linux/string.h>
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#include <asm/page.h>
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#include <asm/extable.h>
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#include <asm-generic/access_ok.h>
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/*
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* These are the main single-value transfer routines. They automatically
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* use the right size if we just have the right pointer type.
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*
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* This gets kind of ugly. We want to return _two_ values in "get_user()"
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* and yet we don't want to do any pointers, because that is too much
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* of a performance impact. Thus we have a few rather ugly macros here,
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* and hide all the uglyness from the user.
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*
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* The "__xxx" versions of the user access functions are versions that
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* do not verify the address space, that must have been done previously
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* with a separate "access_ok()" call (this is used when we do multiple
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* accesses to the same area of user memory).
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*
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* As we use the same address space for kernel and user data on the
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* PowerPC, we can just do these as direct assignments. (Of course, the
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* exception handling means that it's no longer "just"...)
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*/
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#define get_user(x, ptr) \
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__get_user_check((x), (ptr), sizeof(*(ptr)))
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#define put_user(x, ptr) \
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__put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
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#define __get_user(x, ptr) \
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__get_user_nocheck((x), (ptr), sizeof(*(ptr)))
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#define __put_user(x, ptr) \
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__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
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extern long __put_user_bad(void);
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#define __put_user_nocheck(x, ptr, size) \
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({ \
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long __pu_err; \
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__put_user_size((x), (ptr), (size), __pu_err); \
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__pu_err; \
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})
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#define __put_user_check(x, ptr, size) \
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({ \
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long __pu_err = -EFAULT; \
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__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
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if (access_ok(__pu_addr, size)) \
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__put_user_size((x), __pu_addr, (size), __pu_err); \
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__pu_err; \
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})
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#define __put_user_size(x, ptr, size, retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: __put_user_asm(x, ptr, retval, "l.sb"); break; \
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case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \
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case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \
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case 8: __put_user_asm2(x, ptr, retval); break; \
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default: __put_user_bad(); \
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} \
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} while (0)
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struct __large_struct {
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unsigned long buf[100];
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};
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#define __m(x) (*(struct __large_struct *)(x))
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/*
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* We don't tell gcc that we are accessing memory, but this is OK
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* because we do not write to any memory gcc knows about, so there
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* are no aliasing issues.
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*/
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#define __put_user_asm(x, addr, err, op) \
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__asm__ __volatile__( \
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"1: "op" 0(%2),%1\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: l.addi %0,r0,%3\n" \
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" l.j 2b\n" \
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" l.nop\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 2\n" \
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" .long 1b,3b\n" \
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".previous" \
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: "=r"(err) \
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: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
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#define __put_user_asm2(x, addr, err) \
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__asm__ __volatile__( \
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"1: l.sw 0(%2),%1\n" \
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"2: l.sw 4(%2),%H1\n" \
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"3:\n" \
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".section .fixup,\"ax\"\n" \
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"4: l.addi %0,r0,%3\n" \
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" l.j 3b\n" \
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" l.nop\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 2\n" \
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" .long 1b,4b\n" \
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" .long 2b,4b\n" \
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".previous" \
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: "=r"(err) \
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: "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
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#define __get_user_nocheck(x, ptr, size) \
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({ \
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long __gu_err; \
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__get_user_size((x), (ptr), (size), __gu_err); \
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__gu_err; \
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})
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#define __get_user_check(x, ptr, size) \
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({ \
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long __gu_err = -EFAULT; \
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const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
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if (access_ok(__gu_addr, size)) \
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__get_user_size((x), __gu_addr, (size), __gu_err); \
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else \
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(x) = (__typeof__(*(ptr))) 0; \
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__gu_err; \
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})
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extern long __get_user_bad(void);
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#define __get_user_size(x, ptr, size, retval) \
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do { \
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retval = 0; \
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switch (size) { \
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case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break; \
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case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \
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case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \
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case 8: __get_user_asm2(x, ptr, retval); break; \
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default: (x) = (__typeof__(*(ptr)))__get_user_bad(); \
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} \
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} while (0)
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#define __get_user_asm(x, addr, err, op) \
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{ \
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unsigned long __gu_tmp; \
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__asm__ __volatile__( \
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"1: "op" %1,0(%2)\n" \
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"2:\n" \
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".section .fixup,\"ax\"\n" \
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"3: l.addi %0,r0,%3\n" \
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" l.addi %1,r0,0\n" \
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" l.j 2b\n" \
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" l.nop\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 2\n" \
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" .long 1b,3b\n" \
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".previous" \
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: "=r"(err), "=r"(__gu_tmp) \
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: "r"(addr), "i"(-EFAULT), "0"(err)); \
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(x) = (__typeof__(*(addr)))__gu_tmp; \
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}
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#define __get_user_asm2(x, addr, err) \
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{ \
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unsigned long long __gu_tmp; \
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__asm__ __volatile__( \
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"1: l.lwz %1,0(%2)\n" \
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"2: l.lwz %H1,4(%2)\n" \
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"3:\n" \
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".section .fixup,\"ax\"\n" \
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"4: l.addi %0,r0,%3\n" \
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" l.addi %1,r0,0\n" \
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" l.addi %H1,r0,0\n" \
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" l.j 3b\n" \
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" l.nop\n" \
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".previous\n" \
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".section __ex_table,\"a\"\n" \
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" .align 2\n" \
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" .long 1b,4b\n" \
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" .long 2b,4b\n" \
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".previous" \
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: "=r"(err), "=&r"(__gu_tmp) \
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: "r"(addr), "i"(-EFAULT), "0"(err)); \
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(x) = (__typeof__(*(addr)))( \
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(__typeof__((x)-(x)))__gu_tmp); \
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}
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/* more complex routines */
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extern unsigned long __must_check
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__copy_tofrom_user(void *to, const void *from, unsigned long size);
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static inline unsigned long
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raw_copy_from_user(void *to, const void __user *from, unsigned long size)
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{
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return __copy_tofrom_user(to, (__force const void *)from, size);
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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 size)
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{
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return __copy_tofrom_user((__force void *)to, from, size);
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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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extern unsigned long __clear_user(void __user *addr, unsigned long size);
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static inline __must_check unsigned long
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clear_user(void __user *addr, unsigned long size)
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{
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if (likely(access_ok(addr, size)))
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size = __clear_user(addr, size);
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return size;
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}
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extern long strncpy_from_user(char *dest, const char __user *src, long count);
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extern __must_check long strnlen_user(const char __user *str, long n);
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#endif /* __ASM_OPENRISC_UACCESS_H */
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