2008-10-23 12:26:29 +07:00
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#ifndef _ASM_X86_UACCESS_64_H
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#define _ASM_X86_UACCESS_64_H
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2005-04-17 05:20:36 +07:00
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/*
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* User space memory access functions
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*/
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#include <linux/compiler.h>
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#include <linux/errno.h>
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2008-10-03 04:50:12 +07:00
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#include <linux/lockdep.h>
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2009-12-18 23:12:56 +07:00
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#include <asm/alternative.h>
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#include <asm/cpufeature.h>
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2005-04-17 05:20:36 +07:00
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#include <asm/page.h>
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/*
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* Copy To/From Userspace
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*/
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/* Handles exceptions in both to and from, but doesn't do access_ok */
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2006-09-26 15:52:39 +07:00
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__must_check unsigned long
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2012-05-25 08:19:45 +07:00
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copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
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__must_check unsigned long
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2009-12-18 23:12:56 +07:00
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copy_user_generic_string(void *to, const void *from, unsigned len);
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__must_check unsigned long
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copy_user_generic_unrolled(void *to, const void *from, unsigned len);
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static __always_inline __must_check unsigned long
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copy_user_generic(void *to, const void *from, unsigned len)
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{
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unsigned ret;
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2012-05-25 08:19:45 +07:00
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/*
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* If CPU has ERMS feature, use copy_user_enhanced_fast_string.
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* Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
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* Otherwise, use copy_user_generic_unrolled.
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*/
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alternative_call_2(copy_user_generic_unrolled,
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2009-12-18 23:12:56 +07:00
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copy_user_generic_string,
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X86_FEATURE_REP_GOOD,
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2012-05-25 08:19:45 +07:00
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copy_user_enhanced_fast_string,
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X86_FEATURE_ERMS,
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2009-12-18 23:12:56 +07:00
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ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
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"=d" (len)),
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"1" (to), "2" (from), "3" (len)
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: "memory", "rcx", "r8", "r9", "r10", "r11");
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return ret;
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}
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2006-09-26 15:52:39 +07:00
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__must_check unsigned long
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copy_in_user(void __user *to, const void __user *from, unsigned len);
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static __always_inline __must_check
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2013-08-17 04:17:19 +07:00
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int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
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2008-03-23 15:03:49 +07:00
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{
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2006-09-26 15:52:40 +07:00
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int ret = 0;
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2008-09-10 18:37:17 +07:00
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2005-04-17 05:20:36 +07:00
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if (!__builtin_constant_p(size))
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2008-03-23 15:03:49 +07:00
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return copy_user_generic(dst, (__force void *)src, size);
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switch (size) {
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2015-12-18 00:45:09 +07:00
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case 1:
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__uaccess_begin();
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__get_user_asm(*(u8 *)dst, (u8 __user *)src,
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2008-03-23 15:03:49 +07:00
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ret, "b", "b", "=q", 1);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 2:
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__uaccess_begin();
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__get_user_asm(*(u16 *)dst, (u16 __user *)src,
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2008-03-23 15:03:49 +07:00
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ret, "w", "w", "=r", 2);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 4:
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__uaccess_begin();
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__get_user_asm(*(u32 *)dst, (u32 __user *)src,
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2008-03-23 15:03:49 +07:00
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ret, "l", "k", "=r", 4);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 8:
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__uaccess_begin();
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__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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2008-03-23 15:03:49 +07:00
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ret, "q", "", "=r", 8);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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case 10:
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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2008-11-14 09:06:04 +07:00
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ret, "q", "", "=r", 10);
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2015-12-18 00:45:09 +07:00
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if (likely(!ret))
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__get_user_asm(*(u16 *)(8 + (char *)dst),
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(u16 __user *)(8 + (char __user *)src),
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ret, "w", "w", "=r", 2);
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2005-04-17 05:20:36 +07:00
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case 16:
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(*(u64 *)dst, (u64 __user *)src,
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ret, "q", "", "=r", 16);
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2015-12-18 00:45:09 +07:00
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if (likely(!ret))
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__get_user_asm(*(u64 *)(8 + (char *)dst),
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(u64 __user *)(8 + (char __user *)src),
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ret, "q", "", "=r", 8);
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2005-04-17 05:20:36 +07:00
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default:
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2008-03-23 15:03:49 +07:00
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return copy_user_generic(dst, (__force void *)src, size);
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2005-04-17 05:20:36 +07:00
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}
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2008-03-23 15:03:49 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2006-09-26 15:52:39 +07:00
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static __always_inline __must_check
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2013-08-17 04:17:19 +07:00
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int __copy_from_user(void *dst, const void __user *src, unsigned size)
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{
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might_fault();
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return __copy_from_user_nocheck(dst, src, size);
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}
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static __always_inline __must_check
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int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
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2008-03-23 15:03:49 +07:00
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{
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2006-09-26 15:52:40 +07:00
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int ret = 0;
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2008-09-10 18:37:17 +07:00
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2005-04-17 05:20:36 +07:00
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if (!__builtin_constant_p(size))
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2008-03-23 15:03:49 +07:00
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return copy_user_generic((__force void *)dst, src, size);
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switch (size) {
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2015-12-18 00:45:09 +07:00
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case 1:
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__uaccess_begin();
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__put_user_asm(*(u8 *)src, (u8 __user *)dst,
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2008-03-23 15:03:49 +07:00
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ret, "b", "b", "iq", 1);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 2:
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__uaccess_begin();
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__put_user_asm(*(u16 *)src, (u16 __user *)dst,
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2008-03-23 15:03:49 +07:00
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ret, "w", "w", "ir", 2);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 4:
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__uaccess_begin();
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__put_user_asm(*(u32 *)src, (u32 __user *)dst,
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2008-03-23 15:03:49 +07:00
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ret, "l", "k", "ir", 4);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2015-12-18 00:45:09 +07:00
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case 8:
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__uaccess_begin();
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__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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2009-07-19 23:06:35 +07:00
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ret, "q", "", "er", 8);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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case 10:
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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2009-07-19 23:06:35 +07:00
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ret, "q", "", "er", 10);
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2015-12-18 00:45:09 +07:00
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if (likely(!ret)) {
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asm("":::"memory");
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__put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
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ret, "w", "w", "ir", 2);
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}
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2005-04-17 05:20:36 +07:00
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case 16:
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__put_user_asm(*(u64 *)src, (u64 __user *)dst,
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2009-07-19 23:06:35 +07:00
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ret, "q", "", "er", 16);
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2015-12-18 00:45:09 +07:00
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if (likely(!ret)) {
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asm("":::"memory");
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__put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
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ret, "q", "", "er", 8);
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}
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__uaccess_end();
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2008-03-23 15:03:49 +07:00
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return ret;
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2005-04-17 05:20:36 +07:00
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default:
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2008-03-23 15:03:49 +07:00
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return copy_user_generic((__force void *)dst, src, size);
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2005-04-17 05:20:36 +07:00
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}
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2008-03-23 15:03:49 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2013-08-17 04:17:19 +07:00
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static __always_inline __must_check
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int __copy_to_user(void __user *dst, const void *src, unsigned size)
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{
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might_fault();
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return __copy_to_user_nocheck(dst, src, size);
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}
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2006-09-26 15:52:39 +07:00
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static __always_inline __must_check
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int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
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2008-03-23 15:03:49 +07:00
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{
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2006-09-26 15:52:40 +07:00
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int ret = 0;
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2008-09-10 18:37:17 +07:00
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2008-09-10 18:37:17 +07:00
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might_fault();
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2005-04-17 05:20:36 +07:00
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if (!__builtin_constant_p(size))
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2008-03-23 15:03:49 +07:00
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return copy_user_generic((__force void *)dst,
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(__force void *)src, size);
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switch (size) {
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case 1: {
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2005-04-17 05:20:36 +07:00
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u8 tmp;
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(tmp, (u8 __user *)src,
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ret, "b", "b", "=q", 1);
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2005-04-17 05:20:36 +07:00
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if (likely(!ret))
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2008-03-23 15:03:49 +07:00
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__put_user_asm(tmp, (u8 __user *)dst,
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ret, "b", "b", "iq", 1);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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}
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2008-03-23 15:03:49 +07:00
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case 2: {
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2005-04-17 05:20:36 +07:00
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u16 tmp;
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(tmp, (u16 __user *)src,
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ret, "w", "w", "=r", 2);
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2005-04-17 05:20:36 +07:00
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if (likely(!ret))
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2008-03-23 15:03:49 +07:00
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__put_user_asm(tmp, (u16 __user *)dst,
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ret, "w", "w", "ir", 2);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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}
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2008-03-23 15:03:49 +07:00
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case 4: {
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2005-04-17 05:20:36 +07:00
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u32 tmp;
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(tmp, (u32 __user *)src,
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ret, "l", "k", "=r", 4);
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2005-04-17 05:20:36 +07:00
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if (likely(!ret))
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2008-03-23 15:03:49 +07:00
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__put_user_asm(tmp, (u32 __user *)dst,
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ret, "l", "k", "ir", 4);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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}
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2008-03-23 15:03:49 +07:00
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case 8: {
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2005-04-17 05:20:36 +07:00
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u64 tmp;
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2015-12-18 00:45:09 +07:00
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__uaccess_begin();
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2008-03-23 15:03:49 +07:00
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__get_user_asm(tmp, (u64 __user *)src,
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ret, "q", "", "=r", 8);
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2005-04-17 05:20:36 +07:00
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if (likely(!ret))
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2008-03-23 15:03:49 +07:00
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__put_user_asm(tmp, (u64 __user *)dst,
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2009-07-19 23:06:35 +07:00
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ret, "q", "", "er", 8);
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2015-12-18 00:45:09 +07:00
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__uaccess_end();
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2005-04-17 05:20:36 +07:00
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return ret;
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}
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default:
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2008-03-23 15:03:49 +07:00
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return copy_user_generic((__force void *)dst,
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(__force void *)src, size);
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2005-04-17 05:20:36 +07:00
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}
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2008-03-23 15:03:49 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2009-11-13 18:56:24 +07:00
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static __must_check __always_inline int
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__copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
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{
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2014-01-04 04:45:00 +07:00
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return __copy_from_user_nocheck(dst, src, size);
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2009-11-13 18:56:24 +07:00
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}
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2006-09-30 06:47:55 +07:00
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static __must_check __always_inline int
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__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
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{
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2014-01-04 04:45:00 +07:00
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return __copy_to_user_nocheck(dst, src, size);
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2006-09-30 06:47:55 +07:00
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}
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2005-04-17 05:20:36 +07:00
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2008-03-23 15:03:49 +07:00
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extern long __copy_user_nocache(void *dst, const void __user *src,
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unsigned size, int zerorest);
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2007-02-13 19:26:19 +07:00
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2009-03-02 17:00:57 +07:00
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static inline int
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__copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
|
2007-02-13 19:26:19 +07:00
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{
|
2013-05-26 21:31:55 +07:00
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might_fault();
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2009-03-02 17:00:57 +07:00
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return __copy_user_nocache(dst, src, size, 1);
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2007-02-13 19:26:19 +07:00
|
|
|
}
|
|
|
|
|
2009-03-02 17:00:57 +07:00
|
|
|
static inline int
|
|
|
|
__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
|
|
|
|
unsigned size)
|
2007-02-13 19:26:19 +07:00
|
|
|
{
|
2009-03-02 17:00:57 +07:00
|
|
|
return __copy_user_nocache(dst, src, size, 0);
|
2007-02-13 19:26:19 +07:00
|
|
|
}
|
|
|
|
|
2008-07-02 20:48:21 +07:00
|
|
|
unsigned long
|
2015-04-07 00:26:17 +07:00
|
|
|
copy_user_handle_tail(char *to, char *from, unsigned len);
|
2008-07-02 20:48:21 +07:00
|
|
|
|
2008-10-23 12:26:29 +07:00
|
|
|
#endif /* _ASM_X86_UACCESS_64_H */
|