#define USER_DS MAKE_MM_SEG(1)
#define get_ds() (KERNEL_DS)
-#define get_fs() ({ mm_segment_t __x; \
- asm volatile("ear %0,4":"=a" (__x)); \
- __x;})
-#define set_fs(x) ({asm volatile("sar 4,%0"::"a" ((x).ar4));})
+#define get_fs() (current->thread.mm_segment)
+
+#ifdef __s390x__
+#define set_fs(x) \
+({ \
+ unsigned long __pto; \
+ current->thread.mm_segment = (x); \
+ __pto = current->thread.mm_segment.ar4 ? \
+ S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
+ asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \
+})
+#else
+#define set_fs(x) \
+({ \
+ unsigned long __pto; \
+ current->thread.mm_segment = (x); \
+ __pto = current->thread.mm_segment.ar4 ? \
+ S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
+ asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \
+})
+#endif
#define segment_eq(a,b) ((a).ar4 == (b).ar4)
unsigned long insn, fixup;
};
-/*
- * Standard fixup section for uaccess inline functions.
- * local label 0: is the fault point
- * local label 1: is the return point
- * %0 is the error variable
- * %3 is the error value -EFAULT
- */
#ifndef __s390x__
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
- "8: sacf 0\n" \
- " lhi %0,%h3\n" \
- " bras 4,9f\n" \
- " .long 1b\n" \
- "9: l 4,0(4)\n" \
- " br 4\n" \
+ "2: lhi %0,%4\n" \
+ " bras 1,3f\n" \
+ " .long 1b\n" \
+ "3: l 1,0(1)\n" \
+ " br 1\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 4\n" \
- " .long 0b,8b\n" \
+ " .long 0b,2b\n" \
".previous"
+#define __uaccess_clobber "cc", "1"
#else /* __s390x__ */
#define __uaccess_fixup \
".section .fixup,\"ax\"\n" \
- "9: sacf 0\n" \
- " lhi %0,%h3\n" \
- " jg 1b\n" \
+ "2: lghi %0,%4\n" \
+ " jg 1b\n" \
".previous\n" \
".section __ex_table,\"a\"\n" \
" .align 8\n" \
- " .quad 0b,9b\n" \
+ " .quad 0b,2b\n" \
".previous"
+#define __uaccess_clobber "cc"
#endif /* __s390x__ */
/*
* These are the main single-value transfer routines. They automatically
* use the right size if we just have the right pointer type.
*/
-#ifndef __s390x__
-
-#define __put_user_asm_8(x, ptr, err) \
-({ \
- register __typeof__(x) const * __from asm("2"); \
- register __typeof__(*(ptr)) * __to asm("4"); \
- __from = &(x); \
- __to = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: mvc 0(8,%1),0(%2)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err) \
- : "a" (__to),"a" (__from),"K" (-EFAULT),"0" (0),\
- "m" (x) : "cc" ); \
-})
-
-#else /* __s390x__ */
-
-#define __put_user_asm_8(x, ptr, err) \
-({ \
- register __typeof__(*(ptr)) * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: stg %2,0(%1)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err) \
- : "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
-})
-
-#endif /* __s390x__ */
-
-#define __put_user_asm_4(x, ptr, err) \
-({ \
- register __typeof__(*(ptr)) * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: st %2,0(%1)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err) \
- : "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
-})
-
-#define __put_user_asm_2(x, ptr, err) \
+#if __GNUC__ > 2
+#define __put_user_asm(x, ptr, err) \
({ \
- register __typeof__(*(ptr)) * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: sth %2,0(%1)\n" \
- " sacf 0\n" \
+ err = 0; \
+ asm volatile( \
+ "0: mvcs 0(%1,%2),%3,%0\n" \
"1:\n" \
__uaccess_fixup \
- : "=&d" (err) \
- : "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
+ : "+&d" (err) \
+ : "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \
+ "K" (-EFAULT) \
+ : __uaccess_clobber ); \
})
-
-#define __put_user_asm_1(x, ptr, err) \
+#else
+#define __put_user_asm(x, ptr, err) \
({ \
- register __typeof__(*(ptr)) * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: stc %2,0(%1)\n" \
- " sacf 0\n" \
+ err = 0; \
+ asm volatile( \
+ "0: mvcs 0(%1,%2),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
- : "=&d" (err) \
- : "a" (__ptr), "d" (x), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
+ : "+&d" (err) \
+ : "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \
+ "K" (-EFAULT), "m" (x) \
+ : __uaccess_clobber ); \
})
+#endif
#define __put_user(x, ptr) \
({ \
int __pu_err; \
switch (sizeof (*(ptr))) { \
case 1: \
- __put_user_asm_1(__x, ptr, __pu_err); \
- break; \
case 2: \
- __put_user_asm_2(__x, ptr, __pu_err); \
- break; \
case 4: \
- __put_user_asm_4(__x, ptr, __pu_err); \
- break; \
case 8: \
- __put_user_asm_8(__x, ptr, __pu_err); \
+ __put_user_asm(__x, ptr, __pu_err); \
break; \
default: \
__pu_err = __put_user_bad(); \
extern int __put_user_bad(void);
-#ifndef __s390x__
-
-#define __get_user_asm_8(x, ptr, err) \
+#if __GNUC__ > 2
+#define __get_user_asm(x, ptr, err) \
({ \
- register __typeof__(*(ptr)) const * __from asm("4"); \
- register __typeof__(x) * __to asm("2"); \
- __from = (ptr); \
- __to = &(x); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: mvc 0(8,%2),0(%4)\n" \
- " sacf 0\n" \
+ err = 0; \
+ asm volatile ( \
+ "0: mvcp %O1(%2,%R1),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
- : "=&d" (err), "=m" (x) \
- : "a" (__to),"K" (-EFAULT),"a" (__from),"0" (0) \
- : "cc" ); \
+ : "+&d" (err), "=Q" (x) \
+ : "d" (sizeof(*(ptr))), "a" (ptr), \
+ "K" (-EFAULT) \
+ : __uaccess_clobber ); \
})
-
-#else /* __s390x__ */
-
-#define __get_user_asm_8(x, ptr, err) \
-({ \
- register __typeof__(*(ptr)) const * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: lg %1,0(%2)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err), "=d" (x) \
- : "a" (__ptr), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
-})
-
-#endif /* __s390x__ */
-
-
-#define __get_user_asm_4(x, ptr, err) \
-({ \
- register __typeof__(*(ptr)) const * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: l %1,0(%2)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err), "=d" (x) \
- : "a" (__ptr), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
-})
-
-#define __get_user_asm_2(x, ptr, err) \
-({ \
- register __typeof__(*(ptr)) const * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sacf 512\n" \
- "0: lh %1,0(%2)\n" \
- " sacf 0\n" \
- "1:\n" \
- __uaccess_fixup \
- : "=&d" (err), "=d" (x) \
- : "a" (__ptr), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
-})
-
-#define __get_user_asm_1(x, ptr, err) \
+#else
+#define __get_user_asm(x, ptr, err) \
({ \
- register __typeof__(*(ptr)) const * __ptr asm("4"); \
- __ptr = (ptr); \
- __asm__ __volatile__ ( \
- " sr %1,%1\n" \
- " sacf 512\n" \
- "0: ic %1,0(%2)\n" \
- " sacf 0\n" \
+ err = 0; \
+ asm volatile ( \
+ "0: mvcp 0(%2,%5),0(%3),%0\n" \
"1:\n" \
__uaccess_fixup \
- : "=&d" (err), "=&d" (x) \
- : "a" (__ptr), "K" (-EFAULT), "0" (0) \
- : "cc" ); \
+ : "+&d" (err), "=m" (x) \
+ : "d" (sizeof(*(ptr))), "a" (ptr), \
+ "K" (-EFAULT), "a" (&(x)) \
+ : __uaccess_clobber ); \
})
+#endif
#define __get_user(x, ptr) \
({ \
int __gu_err; \
switch (sizeof(*(ptr))) { \
case 1: \
- __get_user_asm_1(__x, ptr, __gu_err); \
- break; \
case 2: \
- __get_user_asm_2(__x, ptr, __gu_err); \
- break; \
case 4: \
- __get_user_asm_4(__x, ptr, __gu_err); \
- break; \
case 8: \
- __get_user_asm_8(__x, ptr, __gu_err); \
+ __get_user_asm(__x, ptr, __gu_err); \
break; \
default: \
__x = 0; \
extern int __get_user_bad(void);
-/*
- * access register are set up, that 4 points to secondary (user),
- * 2 to primary (kernel)
- */
+extern long __copy_to_user_asm(const void *from, long n, void *to);
-extern long __copy_to_user_asm(const void *from, long n, const void *to);
-
-#define __copy_to_user(to, from, n) \
-({ \
- __copy_to_user_asm(from, n, to); \
-})
+/**
+ * __copy_to_user: - Copy a block of data into user space, with less checking.
+ * @to: Destination address, in user space.
+ * @from: Source address, in kernel space.
+ * @n: Number of bytes to copy.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * Copy data from kernel space to user space. Caller must check
+ * the specified block with access_ok() before calling this function.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+static inline unsigned long
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ return __copy_to_user_asm(from, n, to);
+}
-#define copy_to_user(to, from, n) \
-({ \
- long err = 0; \
- __typeof__(n) __n = (n); \
- might_sleep(); \
- if (__access_ok(to,__n)) { \
- err = __copy_to_user_asm(from, __n, to); \
- } \
- else \
- err = __n; \
- err; \
-})
+/**
+ * copy_to_user: - Copy a block of data into user space.
+ * @to: Destination address, in user space.
+ * @from: Source address, in kernel space.
+ * @n: Number of bytes to copy.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * Copy data from kernel space to user space.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+static inline unsigned long
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ might_sleep();
+ if (access_ok(VERIFY_WRITE, to, n))
+ n = __copy_to_user(to, from, n);
+ return n;
+}
extern long __copy_from_user_asm(void *to, long n, const void *from);
-#define __copy_from_user(to, from, n) \
-({ \
- __copy_from_user_asm(to, n, from); \
-})
-
-#define copy_from_user(to, from, n) \
-({ \
- long err = 0; \
- __typeof__(n) __n = (n); \
- might_sleep(); \
- if (__access_ok(from,__n)) { \
- err = __copy_from_user_asm(to, __n, from); \
- } \
- else \
- err = __n; \
- err; \
-})
-
-extern long __copy_in_user_asm(const void *from, long n, void *to);
-
-#define __copy_in_user(to, from, n) \
-({ \
- __copy_in_user_asm(from, n, to); \
-})
-
-#define copy_in_user(to, from, n) \
-({ \
- long err = 0; \
- __typeof__(n) __n = (n); \
- might_sleep(); \
- if (__access_ok(from,__n) && __access_ok(to,__n)) { \
- err = __copy_in_user_asm(from, __n, to); \
- } \
- else \
- err = __n; \
- err; \
-})
+/**
+ * __copy_from_user: - Copy a block of data from user space, with less checking.
+ * @to: Destination address, in kernel space.
+ * @from: Source address, in user space.
+ * @n: Number of bytes to copy.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * Copy data from user space to kernel space. Caller must check
+ * the specified block with access_ok() before calling this function.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ *
+ * If some data could not be copied, this function will pad the copied
+ * data to the requested size using zero bytes.
+ */
+static inline unsigned long
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ return __copy_from_user_asm(to, n, from);
+}
-/*
- * Copy a null terminated string from userspace.
+/**
+ * copy_from_user: - Copy a block of data from user space.
+ * @to: Destination address, in kernel space.
+ * @from: Source address, in user space.
+ * @n: Number of bytes to copy.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * Copy data from user space to kernel space.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ *
+ * If some data could not be copied, this function will pad the copied
+ * data to the requested size using zero bytes.
*/
+static inline unsigned long
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ might_sleep();
+ if (access_ok(VERIFY_READ, from, n))
+ n = __copy_from_user(to, from, n);
+ else
+ memset(to, 0, n);
+ return n;
+}
-#ifndef __s390x__
+extern long __copy_in_user_asm(const void *from, long n, void *to);
-static inline long
-__strncpy_from_user(char *dst, const char *src, long count)
+static inline unsigned long
+__copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
- int len;
- __asm__ __volatile__ (
- " slr %0,%0\n"
- " lr 2,%1\n"
- " lr 4,%2\n"
- " slr 3,3\n"
- " sacf 512\n"
- "0: ic 3,0(%0,4)\n"
- "1: stc 3,0(%0,2)\n"
- " ltr 3,3\n"
- " jz 2f\n"
- " ahi %0,1\n"
- " clr %0,%3\n"
- " jl 0b\n"
- "2: sacf 0\n"
- ".section .fixup,\"ax\"\n"
- "3: lhi %0,%h4\n"
- " basr 3,0\n"
- " l 3,4f-.(3)\n"
- " br 3\n"
- "4: .long 2b\n"
- ".previous\n"
- ".section __ex_table,\"a\"\n"
- " .align 4\n"
- " .long 0b,3b\n"
- " .long 1b,3b\n"
- ".previous"
- : "=&a" (len)
- : "a" (dst), "d" (src), "d" (count), "K" (-EFAULT)
- : "2", "3", "4", "memory", "cc" );
- return len;
+ __copy_in_user_asm(from, n, to);
}
-#else /* __s390x__ */
-
-static inline long
-__strncpy_from_user(char *dst, const char *src, long count)
+static inline unsigned long
+copy_in_user(void __user *to, const void __user *from, unsigned long n)
{
- long len;
- __asm__ __volatile__ (
- " slgr %0,%0\n"
- " lgr 2,%1\n"
- " lgr 4,%2\n"
- " slr 3,3\n"
- " sacf 512\n"
- "0: ic 3,0(%0,4)\n"
- "1: stc 3,0(%0,2)\n"
- " ltr 3,3\n"
- " jz 2f\n"
- " aghi %0,1\n"
- " cgr %0,%3\n"
- " jl 0b\n"
- "2: sacf 0\n"
- ".section .fixup,\"ax\"\n"
- "3: lghi %0,%h4\n"
- " jg 2b\n"
- ".previous\n"
- ".section __ex_table,\"a\"\n"
- " .align 8\n"
- " .quad 0b,3b\n"
- " .quad 1b,3b\n"
- ".previous"
- : "=&a" (len)
- : "a" (dst), "d" (src), "d" (count), "K" (-EFAULT)
- : "cc", "2" ,"3", "4" );
- return len;
+ might_sleep();
+ if (__access_ok(from,n) && __access_ok(to,n))
+ n = __copy_in_user_asm(from, n, to);
+ return n;
}
-#endif /* __s390x__ */
+/*
+ * Copy a null terminated string from userspace.
+ */
+extern long __strncpy_from_user_asm(char *dst, const char *src, long count);
static inline long
strncpy_from_user(char *dst, const char *src, long count)
long res = -EFAULT;
might_sleep();
if (access_ok(VERIFY_READ, src, 1))
- res = __strncpy_from_user(dst, src, count);
+ res = __strncpy_from_user_asm(dst, src, count);
return res;
}
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 for error
- */
-#ifndef __s390x__
+extern long __strnlen_user_asm(const char *src, long count);
static inline unsigned long
strnlen_user(const char * src, unsigned long n)
{
might_sleep();
- __asm__ __volatile__ (
- " alr %0,%1\n"
- " slr 0,0\n"
- " lr 4,%1\n"
- " sacf 512\n"
- "0: srst %0,4\n"
- " jo 0b\n"
- " slr %0,%1\n"
- " ahi %0,1\n"
- " sacf 0\n"
- "1:\n"
- ".section .fixup,\"ax\"\n"
- "2: sacf 0\n"
- " slr %0,%0\n"
- " bras 4,3f\n"
- " .long 1b\n"
- "3: l 4,0(4)\n"
- " br 4\n"
- ".previous\n"
- ".section __ex_table,\"a\"\n"
- " .align 4\n"
- " .long 0b,2b\n"
- ".previous"
- : "+&a" (n) : "d" (src)
- : "cc", "0", "4" );
- return n;
+ return __strnlen_user_asm(src, n);
}
-#else /* __s390x__ */
-
-static inline unsigned long
-strnlen_user(const char * src, unsigned long n)
-{
- might_sleep();
-#if 0
- __asm__ __volatile__ (
- " algr %0,%1\n"
- " slgr 0,0\n"
- " lgr 4,%1\n"
- " sacf 512\n"
- "0: srst %0,4\n"
- " jo 0b\n"
- " slgr %0,%1\n"
- " aghi %0,1\n"
- "1: sacf 0\n"
- ".section .fixup,\"ax\"\n"
- "2: slgr %0,%0\n"
- " jg 1b\n"
- ".previous\n"
- ".section __ex_table,\"a\"\n"
- " .align 8\n"
- " .quad 0b,2b\n"
- ".previous"
- : "+&a" (n) : "d" (src)
- : "cc", "0", "4" );
-#else
- __asm__ __volatile__ (
- " lgr 4,%1\n"
- " sacf 512\n"
- "0: cli 0(4),0x00\n"
- " la 4,1(4)\n"
- " je 1f\n"
- " brctg %0,0b\n"
- "1: lgr %0,4\n"
- " slgr %0,%1\n"
- "2: sacf 0\n"
- ".section .fixup,\"ax\"\n"
- "3: slgr %0,%0\n"
- " jg 2b\n"
- ".previous\n"
- ".section __ex_table,\"a\"\n"
- " .align 8\n"
- " .quad 0b,3b\n"
- ".previous"
- : "+&a" (n) : "d" (src)
- : "cc", "4" );
-#endif
- return n;
-}
-
-#endif /* __s390x__ */
-
+/**
+ * strlen_user: - Get the size of a string in user space.
+ * @str: The string to measure.
+ *
+ * Context: User context only. This function may sleep.
+ *
+ * Get the size of a NUL-terminated string in user space.
+ *
+ * Returns the size of the string INCLUDING the terminating NUL.
+ * On exception, returns 0.
+ *
+ * If there is a limit on the length of a valid string, you may wish to
+ * consider using strnlen_user() instead.
+ */
#define strlen_user(str) strnlen_user(str, ~0UL)
/*
extern long __clear_user_asm(void *to, long n);
-#define __clear_user(to, n) \
-({ \
- __clear_user_asm(to, n); \
-})
+static inline unsigned long
+__clear_user(void *to, unsigned long n)
+{
+ return __clear_user_asm(to, n);
+}
static inline unsigned long
clear_user(void *to, unsigned long n)
{
might_sleep();
if (access_ok(VERIFY_WRITE, to, n))
- n = __clear_user(to, n);
+ n = __clear_user_asm(to, n);
return n;
}
projects / linux / commitdiff