Switch to using the asm-generic/uaccess functions for non-MMU builds.
Remove all the m68knommu local specific uaccess defines and macros.
There is nothing so special about the m68knommu targets that they cannot
use all of the asm-generic uaccess support. Using the asm-generic
uaccess definitions also resolves some of the existing problems with
missing __user annotations in the m68knommu specific functions.
The elimination of all of the contents of uaccess_no.h means we can fold
the uaccess_mm.h back into uaccess.h - and just have the single file
now.
The resulting generated code ends up being slightly smaller (by a few
hundred bytes) due to the compilers ability to better optimize load
and stores without forcing its hand with asm statements.
Specifically trivial cases like this contrived example:
get_user(x, ptr);
x++;
put_user(x, ptr);
end up now being optimized to a single instruction on m68k. More
generally the compiler can avoid using a temporary register in many
cases as well.
Reported-by: kernel test robot <lkp@intel.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
select GENERIC_IOMAP
select GENERIC_STRNCPY_FROM_USER if MMU
select GENERIC_STRNLEN_USER if MMU
+ select UACCESS_MEMCPY if !MMU
select ARCH_WANT_IPC_PARSE_VERSION
select HAVE_FUTEX_CMPXCHG if MMU && FUTEX
select HAVE_MOD_ARCH_SPECIFIC
/* SPDX-License-Identifier: GPL-2.0 */
-#ifdef __uClinux__
-#include <asm/uaccess_no.h>
+#ifndef __M68K_UACCESS_H
+#define __M68K_UACCESS_H
+
+#ifdef CONFIG_MMU
+
+/*
+ * User space memory access functions
+ */
+#include <linux/compiler.h>
+#include <linux/types.h>
+#include <asm/segment.h>
+#include <asm/extable.h>
+
+/* We let the MMU do all checking */
+static inline int access_ok(const void __user *addr,
+ unsigned long size)
+{
+ return 1;
+}
+
+/*
+ * Not all varients of the 68k family support the notion of address spaces.
+ * The traditional 680x0 parts do, and they use the sfc/dfc registers and
+ * the "moves" instruction to access user space from kernel space. Other
+ * family members like ColdFire don't support this, and only have a single
+ * address space, and use the usual "move" instruction for user space access.
+ *
+ * Outside of this difference the user space access functions are the same.
+ * So lets keep the code simple and just define in what we need to use.
+ */
+#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
+#define MOVES "moves"
#else
-#include <asm/uaccess_mm.h>
+#define MOVES "move"
#endif
-#include <asm/extable.h>
+
+extern int __put_user_bad(void);
+extern int __get_user_bad(void);
+
+#define __put_user_asm(res, x, ptr, bwl, reg, err) \
+asm volatile ("\n" \
+ "1: "MOVES"."#bwl" %2,%1\n" \
+ "2:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "10: moveq.l %3,%0\n" \
+ " jra 2b\n" \
+ " .previous\n" \
+ "\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 1b,10b\n" \
+ " .long 2b,10b\n" \
+ " .previous" \
+ : "+d" (res), "=m" (*(ptr)) \
+ : #reg (x), "i" (err))
+
+/*
+ * These are the main single-value transfer routines. They automatically
+ * use the right size if we just have the right pointer type.
+ */
+
+#define __put_user(x, ptr) \
+({ \
+ typeof(*(ptr)) __pu_val = (x); \
+ int __pu_err = 0; \
+ __chk_user_ptr(ptr); \
+ switch (sizeof (*(ptr))) { \
+ case 1: \
+ __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
+ break; \
+ case 2: \
+ __put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
+ break; \
+ case 4: \
+ __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
+ break; \
+ case 8: \
+ { \
+ const void __user *__pu_ptr = (ptr); \
+ asm volatile ("\n" \
+ "1: "MOVES".l %2,(%1)+\n" \
+ "2: "MOVES".l %R2,(%1)\n" \
+ "3:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "10: movel %3,%0\n" \
+ " jra 3b\n" \
+ " .previous\n" \
+ "\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 1b,10b\n" \
+ " .long 2b,10b\n" \
+ " .long 3b,10b\n" \
+ " .previous" \
+ : "+d" (__pu_err), "+a" (__pu_ptr) \
+ : "r" (__pu_val), "i" (-EFAULT) \
+ : "memory"); \
+ break; \
+ } \
+ default: \
+ __pu_err = __put_user_bad(); \
+ break; \
+ } \
+ __pu_err; \
+})
+#define put_user(x, ptr) __put_user(x, ptr)
+
+
+#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
+ type __gu_val; \
+ asm volatile ("\n" \
+ "1: "MOVES"."#bwl" %2,%1\n" \
+ "2:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "10: move.l %3,%0\n" \
+ " sub.l %1,%1\n" \
+ " jra 2b\n" \
+ " .previous\n" \
+ "\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 1b,10b\n" \
+ " .previous" \
+ : "+d" (res), "=&" #reg (__gu_val) \
+ : "m" (*(ptr)), "i" (err)); \
+ (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \
+})
+
+#define __get_user(x, ptr) \
+({ \
+ int __gu_err = 0; \
+ __chk_user_ptr(ptr); \
+ switch (sizeof(*(ptr))) { \
+ case 1: \
+ __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
+ break; \
+ case 2: \
+ __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \
+ break; \
+ case 4: \
+ __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
+ break; \
+ case 8: { \
+ const void __user *__gu_ptr = (ptr); \
+ union { \
+ u64 l; \
+ __typeof__(*(ptr)) t; \
+ } __gu_val; \
+ asm volatile ("\n" \
+ "1: "MOVES".l (%2)+,%1\n" \
+ "2: "MOVES".l (%2),%R1\n" \
+ "3:\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "10: move.l %3,%0\n" \
+ " sub.l %1,%1\n" \
+ " sub.l %R1,%R1\n" \
+ " jra 3b\n" \
+ " .previous\n" \
+ "\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 1b,10b\n" \
+ " .long 2b,10b\n" \
+ " .previous" \
+ : "+d" (__gu_err), "=&r" (__gu_val.l), \
+ "+a" (__gu_ptr) \
+ : "i" (-EFAULT) \
+ : "memory"); \
+ (x) = __gu_val.t; \
+ break; \
+ } \
+ default: \
+ __gu_err = __get_user_bad(); \
+ break; \
+ } \
+ __gu_err; \
+})
+#define get_user(x, ptr) __get_user(x, ptr)
+
+unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
+unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
+
+#define __suffix0
+#define __suffix1 b
+#define __suffix2 w
+#define __suffix4 l
+
+#define ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
+ asm volatile ("\n" \
+ "1: "MOVES"."#s1" (%2)+,%3\n" \
+ " move."#s1" %3,(%1)+\n" \
+ " .ifnc \""#s2"\",\"\"\n" \
+ "2: "MOVES"."#s2" (%2)+,%3\n" \
+ " move."#s2" %3,(%1)+\n" \
+ " .ifnc \""#s3"\",\"\"\n" \
+ "3: "MOVES"."#s3" (%2)+,%3\n" \
+ " move."#s3" %3,(%1)+\n" \
+ " .endif\n" \
+ " .endif\n" \
+ "4:\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 1b,10f\n" \
+ " .ifnc \""#s2"\",\"\"\n" \
+ " .long 2b,20f\n" \
+ " .ifnc \""#s3"\",\"\"\n" \
+ " .long 3b,30f\n" \
+ " .endif\n" \
+ " .endif\n" \
+ " .previous\n" \
+ "\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "10: addq.l #"#n1",%0\n" \
+ " .ifnc \""#s2"\",\"\"\n" \
+ "20: addq.l #"#n2",%0\n" \
+ " .ifnc \""#s3"\",\"\"\n" \
+ "30: addq.l #"#n3",%0\n" \
+ " .endif\n" \
+ " .endif\n" \
+ " jra 4b\n" \
+ " .previous\n" \
+ : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \
+ : : "memory")
+
+#define ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
+ ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)
+#define __constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3) \
+ ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, \
+ __suffix##n1, __suffix##n2, __suffix##n3)
+
+static __always_inline unsigned long
+__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ unsigned long res = 0, tmp;
+
+ switch (n) {
+ case 1:
+ __constant_copy_from_user_asm(res, to, from, tmp, 1, 0, 0);
+ break;
+ case 2:
+ __constant_copy_from_user_asm(res, to, from, tmp, 2, 0, 0);
+ break;
+ case 3:
+ __constant_copy_from_user_asm(res, to, from, tmp, 2, 1, 0);
+ break;
+ case 4:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 0, 0);
+ break;
+ case 5:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 1, 0);
+ break;
+ case 6:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 0);
+ break;
+ case 7:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 1);
+ break;
+ case 8:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 0);
+ break;
+ case 9:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 1);
+ break;
+ case 10:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 2);
+ break;
+ case 12:
+ __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 4);
+ break;
+ default:
+ /* we limit the inlined version to 3 moves */
+ return __generic_copy_from_user(to, from, n);
+ }
+
+ return res;
+}
+
+#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \
+ asm volatile ("\n" \
+ " move."#s1" (%2)+,%3\n" \
+ "11: "MOVES"."#s1" %3,(%1)+\n" \
+ "12: move."#s2" (%2)+,%3\n" \
+ "21: "MOVES"."#s2" %3,(%1)+\n" \
+ "22:\n" \
+ " .ifnc \""#s3"\",\"\"\n" \
+ " move."#s3" (%2)+,%3\n" \
+ "31: "MOVES"."#s3" %3,(%1)+\n" \
+ "32:\n" \
+ " .endif\n" \
+ "4:\n" \
+ "\n" \
+ " .section __ex_table,\"a\"\n" \
+ " .align 4\n" \
+ " .long 11b,5f\n" \
+ " .long 12b,5f\n" \
+ " .long 21b,5f\n" \
+ " .long 22b,5f\n" \
+ " .ifnc \""#s3"\",\"\"\n" \
+ " .long 31b,5f\n" \
+ " .long 32b,5f\n" \
+ " .endif\n" \
+ " .previous\n" \
+ "\n" \
+ " .section .fixup,\"ax\"\n" \
+ " .even\n" \
+ "5: moveq.l #"#n",%0\n" \
+ " jra 4b\n" \
+ " .previous\n" \
+ : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \
+ : : "memory")
+
+static __always_inline unsigned long
+__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ unsigned long res = 0, tmp;
+
+ switch (n) {
+ case 1:
+ __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
+ break;
+ case 2:
+ __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
+ break;
+ case 3:
+ __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
+ break;
+ case 4:
+ __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
+ break;
+ case 5:
+ __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
+ break;
+ case 6:
+ __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
+ break;
+ case 7:
+ __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
+ break;
+ case 8:
+ __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
+ break;
+ case 9:
+ __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
+ break;
+ case 10:
+ __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
+ break;
+ case 12:
+ __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
+ break;
+ default:
+ /* limit the inlined version to 3 moves */
+ return __generic_copy_to_user(to, from, n);
+ }
+
+ return res;
+}
+
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+ if (__builtin_constant_p(n))
+ return __constant_copy_from_user(to, from, n);
+ return __generic_copy_from_user(to, from, n);
+}
+
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+ if (__builtin_constant_p(n))
+ return __constant_copy_to_user(to, from, n);
+ return __generic_copy_to_user(to, from, n);
+}
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
+
+#define user_addr_max() \
+ (uaccess_kernel() ? ~0UL : TASK_SIZE)
+
+extern long strncpy_from_user(char *dst, const char __user *src, long count);
+extern __must_check long strnlen_user(const char __user *str, long n);
+
+unsigned long __clear_user(void __user *to, unsigned long n);
+
+#define clear_user __clear_user
+
+#else /* !CONFIG_MMU */
+#include <asm-generic/uaccess.h>
+#endif
+
+#endif /* _M68K_UACCESS_H */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __M68K_UACCESS_H
-#define __M68K_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <linux/compiler.h>
-#include <linux/types.h>
-#include <asm/segment.h>
-
-/* We let the MMU do all checking */
-static inline int access_ok(const void __user *addr,
- unsigned long size)
-{
- return 1;
-}
-
-/*
- * Not all varients of the 68k family support the notion of address spaces.
- * The traditional 680x0 parts do, and they use the sfc/dfc registers and
- * the "moves" instruction to access user space from kernel space. Other
- * family members like ColdFire don't support this, and only have a single
- * address space, and use the usual "move" instruction for user space access.
- *
- * Outside of this difference the user space access functions are the same.
- * So lets keep the code simple and just define in what we need to use.
- */
-#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
-#define MOVES "moves"
-#else
-#define MOVES "move"
-#endif
-
-extern int __put_user_bad(void);
-extern int __get_user_bad(void);
-
-#define __put_user_asm(res, x, ptr, bwl, reg, err) \
-asm volatile ("\n" \
- "1: "MOVES"."#bwl" %2,%1\n" \
- "2:\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "10: moveq.l %3,%0\n" \
- " jra 2b\n" \
- " .previous\n" \
- "\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,10b\n" \
- " .long 2b,10b\n" \
- " .previous" \
- : "+d" (res), "=m" (*(ptr)) \
- : #reg (x), "i" (err))
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- */
-
-#define __put_user(x, ptr) \
-({ \
- typeof(*(ptr)) __pu_val = (x); \
- int __pu_err = 0; \
- __chk_user_ptr(ptr); \
- switch (sizeof (*(ptr))) { \
- case 1: \
- __put_user_asm(__pu_err, __pu_val, ptr, b, d, -EFAULT); \
- break; \
- case 2: \
- __put_user_asm(__pu_err, __pu_val, ptr, w, r, -EFAULT); \
- break; \
- case 4: \
- __put_user_asm(__pu_err, __pu_val, ptr, l, r, -EFAULT); \
- break; \
- case 8: \
- { \
- const void __user *__pu_ptr = (ptr); \
- asm volatile ("\n" \
- "1: "MOVES".l %2,(%1)+\n" \
- "2: "MOVES".l %R2,(%1)\n" \
- "3:\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "10: movel %3,%0\n" \
- " jra 3b\n" \
- " .previous\n" \
- "\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,10b\n" \
- " .long 2b,10b\n" \
- " .long 3b,10b\n" \
- " .previous" \
- : "+d" (__pu_err), "+a" (__pu_ptr) \
- : "r" (__pu_val), "i" (-EFAULT) \
- : "memory"); \
- break; \
- } \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-#define put_user(x, ptr) __put_user(x, ptr)
-
-
-#define __get_user_asm(res, x, ptr, type, bwl, reg, err) ({ \
- type __gu_val; \
- asm volatile ("\n" \
- "1: "MOVES"."#bwl" %2,%1\n" \
- "2:\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "10: move.l %3,%0\n" \
- " sub.l %1,%1\n" \
- " jra 2b\n" \
- " .previous\n" \
- "\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,10b\n" \
- " .previous" \
- : "+d" (res), "=&" #reg (__gu_val) \
- : "m" (*(ptr)), "i" (err)); \
- (x) = (__force typeof(*(ptr)))(__force unsigned long)__gu_val; \
-})
-
-#define __get_user(x, ptr) \
-({ \
- int __gu_err = 0; \
- __chk_user_ptr(ptr); \
- switch (sizeof(*(ptr))) { \
- case 1: \
- __get_user_asm(__gu_err, x, ptr, u8, b, d, -EFAULT); \
- break; \
- case 2: \
- __get_user_asm(__gu_err, x, ptr, u16, w, r, -EFAULT); \
- break; \
- case 4: \
- __get_user_asm(__gu_err, x, ptr, u32, l, r, -EFAULT); \
- break; \
- case 8: { \
- const void __user *__gu_ptr = (ptr); \
- union { \
- u64 l; \
- __typeof__(*(ptr)) t; \
- } __gu_val; \
- asm volatile ("\n" \
- "1: "MOVES".l (%2)+,%1\n" \
- "2: "MOVES".l (%2),%R1\n" \
- "3:\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "10: move.l %3,%0\n" \
- " sub.l %1,%1\n" \
- " sub.l %R1,%R1\n" \
- " jra 3b\n" \
- " .previous\n" \
- "\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,10b\n" \
- " .long 2b,10b\n" \
- " .previous" \
- : "+d" (__gu_err), "=&r" (__gu_val.l), \
- "+a" (__gu_ptr) \
- : "i" (-EFAULT) \
- : "memory"); \
- (x) = __gu_val.t; \
- break; \
- } \
- default: \
- __gu_err = __get_user_bad(); \
- break; \
- } \
- __gu_err; \
-})
-#define get_user(x, ptr) __get_user(x, ptr)
-
-unsigned long __generic_copy_from_user(void *to, const void __user *from, unsigned long n);
-unsigned long __generic_copy_to_user(void __user *to, const void *from, unsigned long n);
-
-#define __suffix0
-#define __suffix1 b
-#define __suffix2 w
-#define __suffix4 l
-
-#define ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
- asm volatile ("\n" \
- "1: "MOVES"."#s1" (%2)+,%3\n" \
- " move."#s1" %3,(%1)+\n" \
- " .ifnc \""#s2"\",\"\"\n" \
- "2: "MOVES"."#s2" (%2)+,%3\n" \
- " move."#s2" %3,(%1)+\n" \
- " .ifnc \""#s3"\",\"\"\n" \
- "3: "MOVES"."#s3" (%2)+,%3\n" \
- " move."#s3" %3,(%1)+\n" \
- " .endif\n" \
- " .endif\n" \
- "4:\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,10f\n" \
- " .ifnc \""#s2"\",\"\"\n" \
- " .long 2b,20f\n" \
- " .ifnc \""#s3"\",\"\"\n" \
- " .long 3b,30f\n" \
- " .endif\n" \
- " .endif\n" \
- " .previous\n" \
- "\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "10: addq.l #"#n1",%0\n" \
- " .ifnc \""#s2"\",\"\"\n" \
- "20: addq.l #"#n2",%0\n" \
- " .ifnc \""#s3"\",\"\"\n" \
- "30: addq.l #"#n3",%0\n" \
- " .endif\n" \
- " .endif\n" \
- " jra 4b\n" \
- " .previous\n" \
- : "+d" (res), "+&a" (to), "+a" (from), "=&d" (tmp) \
- : : "memory")
-
-#define ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)\
- ____constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, s1, s2, s3)
-#define __constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3) \
- ___constant_copy_from_user_asm(res, to, from, tmp, n1, n2, n3, \
- __suffix##n1, __suffix##n2, __suffix##n3)
-
-static __always_inline unsigned long
-__constant_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- unsigned long res = 0, tmp;
-
- switch (n) {
- case 1:
- __constant_copy_from_user_asm(res, to, from, tmp, 1, 0, 0);
- break;
- case 2:
- __constant_copy_from_user_asm(res, to, from, tmp, 2, 0, 0);
- break;
- case 3:
- __constant_copy_from_user_asm(res, to, from, tmp, 2, 1, 0);
- break;
- case 4:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 0, 0);
- break;
- case 5:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 1, 0);
- break;
- case 6:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 0);
- break;
- case 7:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 2, 1);
- break;
- case 8:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 0);
- break;
- case 9:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 1);
- break;
- case 10:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 2);
- break;
- case 12:
- __constant_copy_from_user_asm(res, to, from, tmp, 4, 4, 4);
- break;
- default:
- /* we limit the inlined version to 3 moves */
- return __generic_copy_from_user(to, from, n);
- }
-
- return res;
-}
-
-#define __constant_copy_to_user_asm(res, to, from, tmp, n, s1, s2, s3) \
- asm volatile ("\n" \
- " move."#s1" (%2)+,%3\n" \
- "11: "MOVES"."#s1" %3,(%1)+\n" \
- "12: move."#s2" (%2)+,%3\n" \
- "21: "MOVES"."#s2" %3,(%1)+\n" \
- "22:\n" \
- " .ifnc \""#s3"\",\"\"\n" \
- " move."#s3" (%2)+,%3\n" \
- "31: "MOVES"."#s3" %3,(%1)+\n" \
- "32:\n" \
- " .endif\n" \
- "4:\n" \
- "\n" \
- " .section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 11b,5f\n" \
- " .long 12b,5f\n" \
- " .long 21b,5f\n" \
- " .long 22b,5f\n" \
- " .ifnc \""#s3"\",\"\"\n" \
- " .long 31b,5f\n" \
- " .long 32b,5f\n" \
- " .endif\n" \
- " .previous\n" \
- "\n" \
- " .section .fixup,\"ax\"\n" \
- " .even\n" \
- "5: moveq.l #"#n",%0\n" \
- " jra 4b\n" \
- " .previous\n" \
- : "+d" (res), "+a" (to), "+a" (from), "=&d" (tmp) \
- : : "memory")
-
-static __always_inline unsigned long
-__constant_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- unsigned long res = 0, tmp;
-
- switch (n) {
- case 1:
- __put_user_asm(res, *(u8 *)from, (u8 __user *)to, b, d, 1);
- break;
- case 2:
- __put_user_asm(res, *(u16 *)from, (u16 __user *)to, w, r, 2);
- break;
- case 3:
- __constant_copy_to_user_asm(res, to, from, tmp, 3, w, b,);
- break;
- case 4:
- __put_user_asm(res, *(u32 *)from, (u32 __user *)to, l, r, 4);
- break;
- case 5:
- __constant_copy_to_user_asm(res, to, from, tmp, 5, l, b,);
- break;
- case 6:
- __constant_copy_to_user_asm(res, to, from, tmp, 6, l, w,);
- break;
- case 7:
- __constant_copy_to_user_asm(res, to, from, tmp, 7, l, w, b);
- break;
- case 8:
- __constant_copy_to_user_asm(res, to, from, tmp, 8, l, l,);
- break;
- case 9:
- __constant_copy_to_user_asm(res, to, from, tmp, 9, l, l, b);
- break;
- case 10:
- __constant_copy_to_user_asm(res, to, from, tmp, 10, l, l, w);
- break;
- case 12:
- __constant_copy_to_user_asm(res, to, from, tmp, 12, l, l, l);
- break;
- default:
- /* limit the inlined version to 3 moves */
- return __generic_copy_to_user(to, from, n);
- }
-
- return res;
-}
-
-static inline unsigned long
-raw_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- if (__builtin_constant_p(n))
- return __constant_copy_from_user(to, from, n);
- return __generic_copy_from_user(to, from, n);
-}
-
-static inline unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- if (__builtin_constant_p(n))
- return __constant_copy_to_user(to, from, n);
- return __generic_copy_to_user(to, from, n);
-}
-#define INLINE_COPY_FROM_USER
-#define INLINE_COPY_TO_USER
-
-#define user_addr_max() \
- (uaccess_kernel() ? ~0UL : TASK_SIZE)
-
-extern long strncpy_from_user(char *dst, const char __user *src, long count);
-extern __must_check long strnlen_user(const char __user *str, long n);
-
-unsigned long __clear_user(void __user *to, unsigned long n);
-
-#define clear_user __clear_user
-
-#endif /* _M68K_UACCESS_H */
+++ /dev/null
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __M68KNOMMU_UACCESS_H
-#define __M68KNOMMU_UACCESS_H
-
-/*
- * User space memory access functions
- */
-#include <linux/string.h>
-
-#include <asm/segment.h>
-
-#define access_ok(addr,size) _access_ok((unsigned long)(addr),(size))
-
-/*
- * It is not enough to just have access_ok check for a real RAM address.
- * This would disallow the case of code/ro-data running XIP in flash/rom.
- * Ideally we would check the possible flash ranges too, but that is
- * currently not so easy.
- */
-static inline int _access_ok(unsigned long addr, unsigned long size)
-{
- return 1;
-}
-
-/*
- * These are the main single-value transfer routines. They automatically
- * use the right size if we just have the right pointer type.
- */
-
-#define put_user(x, ptr) \
-({ \
- int __pu_err = 0; \
- typeof(*(ptr)) __pu_val = (x); \
- switch (sizeof (*(ptr))) { \
- case 1: \
- __put_user_asm(__pu_err, __pu_val, ptr, b); \
- break; \
- case 2: \
- __put_user_asm(__pu_err, __pu_val, ptr, w); \
- break; \
- case 4: \
- __put_user_asm(__pu_err, __pu_val, ptr, l); \
- break; \
- case 8: \
- memcpy((void __force *)ptr, &__pu_val, sizeof(*(ptr))); \
- break; \
- default: \
- __pu_err = __put_user_bad(); \
- break; \
- } \
- __pu_err; \
-})
-#define __put_user(x, ptr) put_user(x, ptr)
-
-extern int __put_user_bad(void);
-
-/*
- * 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 __ptr(x) ((unsigned long __user *)(x))
-
-#define __put_user_asm(err,x,ptr,bwl) \
- __asm__ ("move" #bwl " %0,%1" \
- : /* no outputs */ \
- :"d" (x),"m" (*__ptr(ptr)) : "memory")
-
-#define get_user(x, ptr) \
-({ \
- int __gu_err = 0; \
- switch (sizeof(*(ptr))) { \
- case 1: \
- __get_user_asm(__gu_err, x, ptr, b, "=d"); \
- break; \
- case 2: \
- __get_user_asm(__gu_err, x, ptr, w, "=r"); \
- break; \
- case 4: \
- __get_user_asm(__gu_err, x, ptr, l, "=r"); \
- break; \
- case 8: { \
- union { \
- u64 l; \
- __typeof__(*(ptr)) t; \
- } __gu_val; \
- memcpy(&__gu_val.l, (const void __force *)ptr, sizeof(__gu_val.l)); \
- (x) = __gu_val.t; \
- break; \
- } \
- default: \
- __gu_err = __get_user_bad(); \
- break; \
- } \
- __gu_err; \
-})
-#define __get_user(x, ptr) get_user(x, ptr)
-
-extern int __get_user_bad(void);
-
-#define __get_user_asm(err,x,ptr,bwl,reg) \
- __asm__ ("move" #bwl " %1,%0" \
- : "=d" (x) \
- : "m" (*__ptr(ptr)))
-
-static inline unsigned long
-raw_copy_from_user(void *to, const void __user *from, unsigned long n)
-{
- memcpy(to, (__force const void *)from, n);
- return 0;
-}
-
-static inline unsigned long
-raw_copy_to_user(void __user *to, const void *from, unsigned long n)
-{
- memcpy((__force void *)to, from, n);
- return 0;
-}
-#define INLINE_COPY_FROM_USER
-#define INLINE_COPY_TO_USER
-
-/*
- * Copy a null terminated string from userspace.
- */
-
-static inline long
-strncpy_from_user(char *dst, const char *src, long count)
-{
- char *tmp;
- strncpy(dst, src, count);
- for (tmp = dst; *tmp && count > 0; tmp++, count--)
- ;
- return(tmp - dst); /* DAVIDM should we count a NUL ? check getname */
-}
-
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 on exception, a value greater than N if too long
- */
-static inline long strnlen_user(const char *src, long n)
-{
- return(strlen(src) + 1); /* DAVIDM make safer */
-}
-
-/*
- * Zero Userspace
- */
-
-static inline unsigned long
-__clear_user(void *to, unsigned long n)
-{
- memset(to, 0, n);
- return 0;
-}
-
-#define clear_user(to,n) __clear_user(to,n)
-
-#endif /* _M68KNOMMU_UACCESS_H */
projects / linux.git / commitdiff