mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 02:15:21 +07:00
4b842e4e25
Very few call sites where that would be triggered remain, and none of those is anywhere near hot enough to bother. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_UACCESS_64_H
|
|
#define _ASM_X86_UACCESS_64_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/kasan-checks.h>
|
|
#include <asm/alternative.h>
|
|
#include <asm/cpufeatures.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* Copy To/From Userspace
|
|
*/
|
|
|
|
/* Handles exceptions in both to and from, but doesn't do access_ok */
|
|
__must_check unsigned long
|
|
copy_user_enhanced_fast_string(void *to, const void *from, unsigned len);
|
|
__must_check unsigned long
|
|
copy_user_generic_string(void *to, const void *from, unsigned len);
|
|
__must_check unsigned long
|
|
copy_user_generic_unrolled(void *to, const void *from, unsigned len);
|
|
|
|
static __always_inline __must_check unsigned long
|
|
copy_user_generic(void *to, const void *from, unsigned len)
|
|
{
|
|
unsigned ret;
|
|
|
|
/*
|
|
* If CPU has ERMS feature, use copy_user_enhanced_fast_string.
|
|
* Otherwise, if CPU has rep_good feature, use copy_user_generic_string.
|
|
* Otherwise, use copy_user_generic_unrolled.
|
|
*/
|
|
alternative_call_2(copy_user_generic_unrolled,
|
|
copy_user_generic_string,
|
|
X86_FEATURE_REP_GOOD,
|
|
copy_user_enhanced_fast_string,
|
|
X86_FEATURE_ERMS,
|
|
ASM_OUTPUT2("=a" (ret), "=D" (to), "=S" (from),
|
|
"=d" (len)),
|
|
"1" (to), "2" (from), "3" (len)
|
|
: "memory", "rcx", "r8", "r9", "r10", "r11");
|
|
return ret;
|
|
}
|
|
|
|
static __always_inline __must_check unsigned long
|
|
copy_to_user_mcsafe(void *to, const void *from, unsigned len)
|
|
{
|
|
unsigned long ret;
|
|
|
|
__uaccess_begin();
|
|
/*
|
|
* Note, __memcpy_mcsafe() is explicitly used since it can
|
|
* handle exceptions / faults. memcpy_mcsafe() may fall back to
|
|
* memcpy() which lacks this handling.
|
|
*/
|
|
ret = __memcpy_mcsafe(to, from, len);
|
|
__uaccess_end();
|
|
return ret;
|
|
}
|
|
|
|
static __always_inline __must_check unsigned long
|
|
raw_copy_from_user(void *dst, const void __user *src, unsigned long size)
|
|
{
|
|
return copy_user_generic(dst, (__force void *)src, size);
|
|
}
|
|
|
|
static __always_inline __must_check unsigned long
|
|
raw_copy_to_user(void __user *dst, const void *src, unsigned long size)
|
|
{
|
|
return copy_user_generic((__force void *)dst, src, size);
|
|
}
|
|
|
|
static __always_inline __must_check
|
|
unsigned long raw_copy_in_user(void __user *dst, const void __user *src, unsigned long size)
|
|
{
|
|
return copy_user_generic((__force void *)dst,
|
|
(__force void *)src, size);
|
|
}
|
|
|
|
extern long __copy_user_nocache(void *dst, const void __user *src,
|
|
unsigned size, int zerorest);
|
|
|
|
extern long __copy_user_flushcache(void *dst, const void __user *src, unsigned size);
|
|
extern void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
|
|
size_t len);
|
|
|
|
static inline int
|
|
__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
|
|
unsigned size)
|
|
{
|
|
kasan_check_write(dst, size);
|
|
return __copy_user_nocache(dst, src, size, 0);
|
|
}
|
|
|
|
static inline int
|
|
__copy_from_user_flushcache(void *dst, const void __user *src, unsigned size)
|
|
{
|
|
kasan_check_write(dst, size);
|
|
return __copy_user_flushcache(dst, src, size);
|
|
}
|
|
|
|
unsigned long
|
|
mcsafe_handle_tail(char *to, char *from, unsigned len);
|
|
|
|
#endif /* _ASM_X86_UACCESS_64_H */
|