64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_UACCESS_32_H
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#define _ASM_X86_UACCESS_32_H
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/*
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* User space memory access functions
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*/
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#include <linux/string.h>
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#include <asm/asm.h>
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#include <asm/page.h>
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unsigned long __must_check __copy_user_ll
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(void *to, const void *from, unsigned long n);
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unsigned long __must_check __copy_from_user_ll_nocache_nozero
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(void *to, const void __user *from, unsigned long n);
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static __always_inline unsigned long __must_check
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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_user_ll((__force void *)to, from, n);
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}
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static __always_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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if (__builtin_constant_p(n)) {
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unsigned long ret;
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switch (n) {
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case 1:
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ret = 0;
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__uaccess_begin_nospec();
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__get_user_asm_nozero(*(u8 *)to, from, ret,
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"b", "b", "=q", 1);
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__uaccess_end();
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return ret;
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case 2:
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ret = 0;
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__uaccess_begin_nospec();
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__get_user_asm_nozero(*(u16 *)to, from, ret,
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"w", "w", "=r", 2);
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__uaccess_end();
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return ret;
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case 4:
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ret = 0;
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__uaccess_begin_nospec();
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__get_user_asm_nozero(*(u32 *)to, from, ret,
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"l", "k", "=r", 4);
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__uaccess_end();
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return ret;
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}
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}
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return __copy_user_ll(to, (__force const void *)from, n);
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}
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static __always_inline unsigned long
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__copy_from_user_inatomic_nocache(void *to, const void __user *from,
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unsigned long n)
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{
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return __copy_from_user_ll_nocache_nozero(to, from, n);
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}
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#endif /* _ASM_X86_UACCESS_32_H */
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