提交 dc70ddf4 编写于 作者: G Glauber Costa 提交者: Ingo Molnar

x86: merge __put_user_asm and its user.

Move both __put_user_asm and __put_user_size to
uaccess.h. i386 already had a special function for 64-bit access,
so for x86_64, we just define a macro with the same name.
Note that for X86_64, CONFIG_X86_WP_WORKS_OK will always
be defined, so the #else part will never be even compiled in.
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
上级 d42e6af6
......@@ -178,6 +178,90 @@ extern int __get_user_bad(void);
__ret_gu; \
})
#ifdef CONFIG_X86_32
#define __put_user_u64(x, addr, err) \
asm volatile("1: movl %%eax,0(%2)\n" \
"2: movl %%edx,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r" (err) \
: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
#else
#define __put_user_u64(x, ptr, retval) \
__put_user_asm(x, ptr, retval, "q", "", "Zr", -EFAULT)
#endif
#ifdef CONFIG_X86_WP_WORKS_OK
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
break; \
case 8: \
__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
#else
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
__typeof__(*(ptr))__pus_tmp = x; \
retval = 0; \
\
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
retval = errret; \
} while (0)
#endif
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
__pu_err; \
})
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: mov %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype(x), "m" (__m(addr)), "i" (errret), "0" (err))
#ifdef CONFIG_X86_32
# include "uaccess_32.h"
......
......@@ -145,83 +145,6 @@ extern void __put_user_8(void);
#define __put_user(x, ptr) \
__put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
#define __put_user_nocheck(x, ptr, size) \
({ \
long __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
__pu_err; \
})
#define __put_user_u64(x, addr, err) \
asm volatile("1: movl %%eax,0(%2)\n" \
"2: movl %%edx,4(%2)\n" \
"3:\n" \
".section .fixup,\"ax\"\n" \
"4: movl %3,%0\n" \
" jmp 3b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 4b) \
_ASM_EXTABLE(2b, 4b) \
: "=r" (err) \
: "A" (x), "r" (addr), "i" (-EFAULT), "0" (err))
#ifdef CONFIG_X86_WP_WORKS_OK
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", errret); \
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", errret); \
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
break; \
case 8: \
__put_user_u64((__typeof__(*ptr))(x), ptr, retval); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
#else
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
__typeof__(*(ptr))__pus_tmp = x; \
retval = 0; \
\
if (unlikely(__copy_to_user_ll(ptr, &__pus_tmp, size) != 0)) \
retval = errret; \
} while (0)
#endif
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errret) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup,\"ax\"\n" \
"3: movl %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype (x), "m" (__m(addr)), "i" (errret), "0" (err))
#define __get_user_nocheck(x, ptr, size) \
({ \
long __gu_err; \
......
......@@ -34,14 +34,6 @@ extern void __put_user_bad(void);
#define __get_user_unaligned __get_user
#define __put_user_unaligned __put_user
#define __put_user_nocheck(x, ptr, size) \
({ \
int __pu_err; \
__put_user_size((x), (ptr), (size), __pu_err, -EFAULT); \
__pu_err; \
})
#define __put_user_check(x, ptr, size) \
({ \
int __pu_err; \
......@@ -65,49 +57,6 @@ extern void __put_user_bad(void);
__pu_err; \
})
#define __put_user_size(x, ptr, size, retval, errret) \
do { \
retval = 0; \
__chk_user_ptr(ptr); \
switch (size) { \
case 1: \
__put_user_asm(x, ptr, retval, "b", "b", "iq", errret);\
break; \
case 2: \
__put_user_asm(x, ptr, retval, "w", "w", "ir", errret);\
break; \
case 4: \
__put_user_asm(x, ptr, retval, "l", "k", "ir", errret);\
break; \
case 8: \
__put_user_asm(x, ptr, retval, "q", "", "Zr", errret); \
break; \
default: \
__put_user_bad(); \
} \
} while (0)
/* FIXME: this hack is definitely wrong -AK */
struct __large_struct { unsigned long buf[100]; };
#define __m(x) (*(struct __large_struct __user *)(x))
/*
* Tell gcc we read from memory instead of writing: this is because
* we do not write to any memory gcc knows about, so there are no
* aliasing issues.
*/
#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \
asm volatile("1: mov"itype" %"rtype"1,%2\n" \
"2:\n" \
".section .fixup, \"ax\"\n" \
"3: mov %3,%0\n" \
" jmp 2b\n" \
".previous\n" \
_ASM_EXTABLE(1b, 3b) \
: "=r"(err) \
: ltype (x), "m" (__m(addr)), "i" (errno), "0" (err))
#define __get_user_nocheck(x, ptr, size) \
({ \
int __gu_err; \
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册