mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 21:33:00 +00:00
cd4d09ec6f
Move them to a separate header and have the following dependency: x86/cpufeatures.h <- x86/processor.h <- x86/cpufeature.h This makes it easier to use the header in asm code and not include the whole cpufeature.h and add guards for asm. Suggested-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1453842730-28463-5-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
275 lines
6.8 KiB
C
275 lines
6.8 KiB
C
#ifndef _ASM_X86_UACCESS_64_H
|
|
#define _ASM_X86_UACCESS_64_H
|
|
|
|
/*
|
|
* User space memory access functions
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/lockdep.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;
|
|
}
|
|
|
|
__must_check unsigned long
|
|
copy_in_user(void __user *to, const void __user *from, unsigned len);
|
|
|
|
static __always_inline __must_check
|
|
int __copy_from_user_nocheck(void *dst, const void __user *src, unsigned size)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!__builtin_constant_p(size))
|
|
return copy_user_generic(dst, (__force void *)src, size);
|
|
switch (size) {
|
|
case 1:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u8 *)dst, (u8 __user *)src,
|
|
ret, "b", "b", "=q", 1);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 2:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u16 *)dst, (u16 __user *)src,
|
|
ret, "w", "w", "=r", 2);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 4:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u32 *)dst, (u32 __user *)src,
|
|
ret, "l", "k", "=r", 4);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 8:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u64 *)dst, (u64 __user *)src,
|
|
ret, "q", "", "=r", 8);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 10:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u64 *)dst, (u64 __user *)src,
|
|
ret, "q", "", "=r", 10);
|
|
if (likely(!ret))
|
|
__get_user_asm(*(u16 *)(8 + (char *)dst),
|
|
(u16 __user *)(8 + (char __user *)src),
|
|
ret, "w", "w", "=r", 2);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 16:
|
|
__uaccess_begin();
|
|
__get_user_asm(*(u64 *)dst, (u64 __user *)src,
|
|
ret, "q", "", "=r", 16);
|
|
if (likely(!ret))
|
|
__get_user_asm(*(u64 *)(8 + (char *)dst),
|
|
(u64 __user *)(8 + (char __user *)src),
|
|
ret, "q", "", "=r", 8);
|
|
__uaccess_end();
|
|
return ret;
|
|
default:
|
|
return copy_user_generic(dst, (__force void *)src, size);
|
|
}
|
|
}
|
|
|
|
static __always_inline __must_check
|
|
int __copy_from_user(void *dst, const void __user *src, unsigned size)
|
|
{
|
|
might_fault();
|
|
return __copy_from_user_nocheck(dst, src, size);
|
|
}
|
|
|
|
static __always_inline __must_check
|
|
int __copy_to_user_nocheck(void __user *dst, const void *src, unsigned size)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!__builtin_constant_p(size))
|
|
return copy_user_generic((__force void *)dst, src, size);
|
|
switch (size) {
|
|
case 1:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u8 *)src, (u8 __user *)dst,
|
|
ret, "b", "b", "iq", 1);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 2:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u16 *)src, (u16 __user *)dst,
|
|
ret, "w", "w", "ir", 2);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 4:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u32 *)src, (u32 __user *)dst,
|
|
ret, "l", "k", "ir", 4);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 8:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u64 *)src, (u64 __user *)dst,
|
|
ret, "q", "", "er", 8);
|
|
__uaccess_end();
|
|
return ret;
|
|
case 10:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u64 *)src, (u64 __user *)dst,
|
|
ret, "q", "", "er", 10);
|
|
if (likely(!ret)) {
|
|
asm("":::"memory");
|
|
__put_user_asm(4[(u16 *)src], 4 + (u16 __user *)dst,
|
|
ret, "w", "w", "ir", 2);
|
|
}
|
|
__uaccess_end();
|
|
return ret;
|
|
case 16:
|
|
__uaccess_begin();
|
|
__put_user_asm(*(u64 *)src, (u64 __user *)dst,
|
|
ret, "q", "", "er", 16);
|
|
if (likely(!ret)) {
|
|
asm("":::"memory");
|
|
__put_user_asm(1[(u64 *)src], 1 + (u64 __user *)dst,
|
|
ret, "q", "", "er", 8);
|
|
}
|
|
__uaccess_end();
|
|
return ret;
|
|
default:
|
|
return copy_user_generic((__force void *)dst, src, size);
|
|
}
|
|
}
|
|
|
|
static __always_inline __must_check
|
|
int __copy_to_user(void __user *dst, const void *src, unsigned size)
|
|
{
|
|
might_fault();
|
|
return __copy_to_user_nocheck(dst, src, size);
|
|
}
|
|
|
|
static __always_inline __must_check
|
|
int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
|
|
{
|
|
int ret = 0;
|
|
|
|
might_fault();
|
|
if (!__builtin_constant_p(size))
|
|
return copy_user_generic((__force void *)dst,
|
|
(__force void *)src, size);
|
|
switch (size) {
|
|
case 1: {
|
|
u8 tmp;
|
|
__uaccess_begin();
|
|
__get_user_asm(tmp, (u8 __user *)src,
|
|
ret, "b", "b", "=q", 1);
|
|
if (likely(!ret))
|
|
__put_user_asm(tmp, (u8 __user *)dst,
|
|
ret, "b", "b", "iq", 1);
|
|
__uaccess_end();
|
|
return ret;
|
|
}
|
|
case 2: {
|
|
u16 tmp;
|
|
__uaccess_begin();
|
|
__get_user_asm(tmp, (u16 __user *)src,
|
|
ret, "w", "w", "=r", 2);
|
|
if (likely(!ret))
|
|
__put_user_asm(tmp, (u16 __user *)dst,
|
|
ret, "w", "w", "ir", 2);
|
|
__uaccess_end();
|
|
return ret;
|
|
}
|
|
|
|
case 4: {
|
|
u32 tmp;
|
|
__uaccess_begin();
|
|
__get_user_asm(tmp, (u32 __user *)src,
|
|
ret, "l", "k", "=r", 4);
|
|
if (likely(!ret))
|
|
__put_user_asm(tmp, (u32 __user *)dst,
|
|
ret, "l", "k", "ir", 4);
|
|
__uaccess_end();
|
|
return ret;
|
|
}
|
|
case 8: {
|
|
u64 tmp;
|
|
__uaccess_begin();
|
|
__get_user_asm(tmp, (u64 __user *)src,
|
|
ret, "q", "", "=r", 8);
|
|
if (likely(!ret))
|
|
__put_user_asm(tmp, (u64 __user *)dst,
|
|
ret, "q", "", "er", 8);
|
|
__uaccess_end();
|
|
return ret;
|
|
}
|
|
default:
|
|
return copy_user_generic((__force void *)dst,
|
|
(__force void *)src, size);
|
|
}
|
|
}
|
|
|
|
static __must_check __always_inline int
|
|
__copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
|
|
{
|
|
return __copy_from_user_nocheck(dst, src, size);
|
|
}
|
|
|
|
static __must_check __always_inline int
|
|
__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
|
|
{
|
|
return __copy_to_user_nocheck(dst, src, size);
|
|
}
|
|
|
|
extern long __copy_user_nocache(void *dst, const void __user *src,
|
|
unsigned size, int zerorest);
|
|
|
|
static inline int
|
|
__copy_from_user_nocache(void *dst, const void __user *src, unsigned size)
|
|
{
|
|
might_fault();
|
|
return __copy_user_nocache(dst, src, size, 1);
|
|
}
|
|
|
|
static inline int
|
|
__copy_from_user_inatomic_nocache(void *dst, const void __user *src,
|
|
unsigned size)
|
|
{
|
|
return __copy_user_nocache(dst, src, size, 0);
|
|
}
|
|
|
|
unsigned long
|
|
copy_user_handle_tail(char *to, char *from, unsigned len);
|
|
|
|
#endif /* _ASM_X86_UACCESS_64_H */
|