1 files changed, 256 insertions, 0 deletions
diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h
new file mode 100644
index 000000000000..45c2c9b2993d
--- /dev/null
+++ b/arch/sh/include/asm/uaccess.h
@@ -0,0 +1,256 @@
+#ifndef __ASM_SH_UACCESS_H
+#define __ASM_SH_UACCESS_H
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <asm/segment.h>
+#define VERIFY_READ    0
+#define VERIFY_WRITE   1
+#define __addr_ok(addr) \
+        ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * Uhhuh, this needs 33-bit arithmetic. We have a carry..
+ *
+ * sum := addr + size;  carry? --> flag = true;
+ * if (sum >= addr_limit) flag = true;
+ */
+#define __access_ok(addr, size)         \
+        (__addr_ok((addr) + (size)))
+#define access_ok(type, addr, size)     \
+        (__chk_user_ptr(addr),          \
+         __access_ok((unsigned long __force)(addr), (size)))
+/*
+ * Uh, these should become the main single-value transfer routines ...
+ * They automatically use the right size if we just have the right
+ * pointer type ...
+ *
+ * As SuperH uses the same address space for kernel and user data, we
+ * can just do these as direct assignments.
+ *
+ * Careful to not
+ * (a) re-use the arguments for side effects (sizeof is ok)
+ * (b) require any knowledge of processes at this stage
+ */
+#define put_user(x,ptr)         __put_user_check((x), (ptr), sizeof(*(ptr)))
+#define get_user(x,ptr)         __get_user_check((x), (ptr), sizeof(*(ptr)))
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the user has to do the
+ * checks by hand with "access_ok()")
+ */
+#define __put_user(x,ptr)       __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
+#define __get_user(x,ptr)       __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct __user *)(x))
+#define __get_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __gu_err;                                          \
+        unsigned long __gu_val;                                 \
+        const __typeof__(*(ptr)) __user *__gu_addr = (ptr);     \
+        __chk_user_ptr(ptr);                                    \
+        __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
+        (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        __gu_err;                                               \
+})
+#define __get_user_check(x,ptr,size)                                    \
+({                                                                      \
+        long __gu_err = -EFAULT;                                        \
+        unsigned long __gu_val = 0;                                     \
+        const __typeof__(*(ptr)) *__gu_addr = (ptr);                    \
+        if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))          \
+                __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
+        (x) = (__typeof__(*(ptr)))__gu_val;                             \
+        __gu_err;                                                       \
+})
+#define __put_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __pu_err;                                          \
+        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
+        __chk_user_ptr(ptr);                                    \
+        __put_user_size((x), __pu_addr, (size), __pu_err);      \
+        __pu_err;                                               \
+})
+#define __put_user_check(x,ptr,size)                            \
+({                                                              \
+        long __pu_err = -EFAULT;                                \
+        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
+        if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))   \
+                __put_user_size((x), __pu_addr, (size),         \
+                                __pu_err);                      \
+        __pu_err;                                               \
+})
+#ifdef CONFIG_SUPERH32
+# include "uaccess_32.h"
+#else
+# include "uaccess_64.h"
+#endif
+/* Generic arbitrary sized copy.  */
+/* Return the number of bytes NOT copied */
+__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
+static __always_inline unsigned long
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+        return __copy_user(to, (__force void *)from, n);
+}
+static __always_inline unsigned long __must_check
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+        return __copy_user((__force void *)to, from, n);
+}
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+/*
+ * Clear the area and return remaining number of bytes
+ * (on failure.  Usually it's 0.)
+ */
+__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
+#define clear_user(addr,n)                                              \
+({                                                                      \
+        void __user * __cl_addr = (addr);                               \
+        unsigned long __cl_size = (n);                                  \
+                                                                        \
+        if (__cl_size && access_ok(VERIFY_WRITE,                        \
+                ((unsigned long)(__cl_addr)), __cl_size))               \
+                __cl_size = __clear_user(__cl_addr, __cl_size);         \
+                                                                        \
+        __cl_size;                                                      \
+})
+/**
+ * strncpy_from_user: - Copy a NUL terminated string from userspace.
+ * @dst:   Destination address, in kernel space.  This buffer must be at
+ *         least @count bytes long.
+ * @src:   Source address, in user space.
+ * @count: Maximum number of bytes to copy, including the trailing NUL.
+ *
+ * Copies a NUL-terminated string from userspace to kernel space.
+ *
+ * On success, returns the length of the string (not including the trailing
+ * NUL).
+ *
+ * If access to userspace fails, returns -EFAULT (some data may have been
+ * copied).
+ *
+ * If @count is smaller than the length of the string, copies @count bytes
+ * and returns @count.
+ */
+#define strncpy_from_user(dest,src,count)                               \
+({                                                                      \
+        unsigned long __sfu_src = (unsigned long)(src);                 \
+        int __sfu_count = (int)(count);                                 \
+        long __sfu_res = -EFAULT;                                       \
+                                                                        \
+        if (__access_ok(__sfu_src, __sfu_count))                        \
+                __sfu_res = __strncpy_from_user((unsigned long)(dest),  \
+                                __sfu_src, __sfu_count);                \
+                                                                        \
+        __sfu_res;                                                      \
+})
+static inline unsigned long
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+        unsigned long __copy_from = (unsigned long) from;
+        __kernel_size_t __copy_size = (__kernel_size_t) n;
+        if (__copy_size && __access_ok(__copy_from, __copy_size))
+                return __copy_user(to, from, __copy_size);
+        return __copy_size;
+}
+static inline unsigned long
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+        unsigned long __copy_to = (unsigned long) to;
+        __kernel_size_t __copy_size = (__kernel_size_t) n;
+        if (__copy_size && __access_ok(__copy_to, __copy_size))
+                return __copy_user(to, from, __copy_size);
+        return __copy_size;
+}
+/**
+ * strnlen_user: - Get the size of a string in user space.
+ * @s: The string to measure.
+ * @n: The maximum valid length
+ *
+ * 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 the string is too long, returns a value greater than @n.
+ */
+static inline long strnlen_user(const char __user *s, long n)
+{
+        if (!__addr_ok(s))
+                return 0;
+        else
+                return __strnlen_user(s, n);
+}
+/**
+ * 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 >> 1)
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ */
+struct exception_table_entry {
+        unsigned long insn, fixup;
+};
+#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
+#define ARCH_HAS_SEARCH_EXTABLE
+#endif
+int fixup_exception(struct pt_regs *regs);
+/* Returns 0 if exception not found and fixup.unit otherwise.  */
+unsigned long search_exception_table(unsigned long addr);
+const struct exception_table_entry *search_exception_tables(unsigned long addr);
+#endif /* __ASM_SH_UACCESS_H */

diff --git a/arch/sh/include/asm/uaccess.h b/arch/sh/include/asm/uaccess.h new file mode 100644 index 000000000000..45c2c9b2993d --- /dev/null +++ b/arch/sh/include/asm/uaccess.h
@@ -0,0 +1,256 @@
	1	#ifndef __ASM_SH_UACCESS_H
	2	#define __ASM_SH_UACCESS_H
	3
	4	#include <linux/errno.h>
	5	#include <linux/sched.h>
	6	#include <asm/segment.h>
	7
	8	#define VERIFY_READ 0
	9	#define VERIFY_WRITE 1
	10
	11	#define __addr_ok(addr) \
	12	((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
	13
	14	/*
	15	* __access_ok: Check if address with size is OK or not.
	16	*
	17	* Uhhuh, this needs 33-bit arithmetic. We have a carry..
	18	*
	19	* sum := addr + size; carry? --> flag = true;
	20	* if (sum >= addr_limit) flag = true;
	21	*/
	22	#define __access_ok(addr, size) \
	23	(__addr_ok((addr) + (size)))
	24	#define access_ok(type, addr, size) \
	25	(__chk_user_ptr(addr), \
	26	__access_ok((unsigned long __force)(addr), (size)))
	27
	28	/*
	29	* Uh, these should become the main single-value transfer routines ...
	30	* They automatically use the right size if we just have the right
	31	* pointer type ...
	32	*
	33	* As SuperH uses the same address space for kernel and user data, we
	34	* can just do these as direct assignments.
	35	*
	36	* Careful to not
	37	* (a) re-use the arguments for side effects (sizeof is ok)
	38	* (b) require any knowledge of processes at this stage
	39	*/
	40	#define put_user(x,ptr) __put_user_check((x), (ptr), sizeof(*(ptr)))
	41	#define get_user(x,ptr) __get_user_check((x), (ptr), sizeof(*(ptr)))
	42
	43	/*
	44	* The "__xxx" versions do not do address space checking, useful when
	45	* doing multiple accesses to the same area (the user has to do the
	46	* checks by hand with "access_ok()")
	47	*/
	48	#define __put_user(x,ptr) __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
	49	#define __get_user(x,ptr) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
	50
	51	struct __large_struct { unsigned long buf[100]; };
	52	#define __m(x) ((struct __large_struct __user )(x))
	53
	54	#define __get_user_nocheck(x,ptr,size) \
	55	({ \
	56	long __gu_err; \
	57	unsigned long __gu_val; \
	58	const __typeof__((ptr)) __user __gu_addr = (ptr); \
	59	__chk_user_ptr(ptr); \
	60	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
	61	(x) = (__typeof__(*(ptr)))__gu_val; \
	62	__gu_err; \
	63	})
	64
	65	#define __get_user_check(x,ptr,size) \
	66	({ \
	67	long __gu_err = -EFAULT; \
	68	unsigned long __gu_val = 0; \
	69	const __typeof__((ptr)) __gu_addr = (ptr); \
	70	if (likely(access_ok(VERIFY_READ, __gu_addr, (size)))) \
	71	__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
	72	(x) = (__typeof__(*(ptr)))__gu_val; \
	73	__gu_err; \
	74	})
	75
	76	#define __put_user_nocheck(x,ptr,size) \
	77	({ \
	78	long __pu_err; \
	79	__typeof__((ptr)) __user __pu_addr = (ptr); \
	80	__chk_user_ptr(ptr); \
	81	__put_user_size((x), __pu_addr, (size), __pu_err); \
	82	__pu_err; \
	83	})
	84
	85	#define __put_user_check(x,ptr,size) \
	86	({ \
	87	long __pu_err = -EFAULT; \
	88	__typeof__((ptr)) __user __pu_addr = (ptr); \
	89	if (likely(access_ok(VERIFY_WRITE, __pu_addr, size))) \
	90	__put_user_size((x), __pu_addr, (size), \
	91	__pu_err); \
	92	__pu_err; \
	93	})
	94
	95	#ifdef CONFIG_SUPERH32
	96	# include "uaccess_32.h"
	97	#else
	98	# include "uaccess_64.h"
	99	#endif
	100
	101	/* Generic arbitrary sized copy. */
	102	/* Return the number of bytes NOT copied */
	103	__kernel_size_t __copy_user(void to, const void from, __kernel_size_t n);
	104
	105	static __always_inline unsigned long
	106	__copy_from_user(void to, const void __user from, unsigned long n)
	107	{
	108	return __copy_user(to, (__force void *)from, n);
	109	}
	110
	111	static __always_inline unsigned long __must_check
	112	__copy_to_user(void __user to, const void from, unsigned long n)
	113	{
	114	return __copy_user((__force void *)to, from, n);
	115	}
	116
	117	#define __copy_to_user_inatomic __copy_to_user
	118	#define __copy_from_user_inatomic __copy_from_user
	119
	120	/*
	121	* Clear the area and return remaining number of bytes
	122	* (on failure. Usually it's 0.)
	123	*/
	124	__kernel_size_t __clear_user(void *addr, __kernel_size_t size);
	125
	126	#define clear_user(addr,n) \
	127	({ \
	128	void __user * __cl_addr = (addr); \
	129	unsigned long __cl_size = (n); \
	130	\
	131	if (__cl_size && access_ok(VERIFY_WRITE, \
	132	((unsigned long)(__cl_addr)), __cl_size)) \
	133	__cl_size = __clear_user(__cl_addr, __cl_size); \
	134	\
	135	__cl_size; \
	136	})
	137
	138	/**
	139	* strncpy_from_user: - Copy a NUL terminated string from userspace.
	140	* @dst: Destination address, in kernel space. This buffer must be at
	141	* least @count bytes long.
	142	* @src: Source address, in user space.
	143	* @count: Maximum number of bytes to copy, including the trailing NUL.
	144	*
	145	* Copies a NUL-terminated string from userspace to kernel space.
	146	*
	147	* On success, returns the length of the string (not including the trailing
	148	* NUL).
	149	*
	150	* If access to userspace fails, returns -EFAULT (some data may have been
	151	* copied).
	152	*
	153	* If @count is smaller than the length of the string, copies @count bytes
	154	* and returns @count.
	155	*/
	156	#define strncpy_from_user(dest,src,count) \
	157	({ \
	158	unsigned long __sfu_src = (unsigned long)(src); \
	159	int __sfu_count = (int)(count); \
	160	long __sfu_res = -EFAULT; \
	161	\
	162	if (__access_ok(__sfu_src, __sfu_count)) \
	163	__sfu_res = __strncpy_from_user((unsigned long)(dest), \
	164	__sfu_src, __sfu_count); \
	165	\
	166	__sfu_res; \
	167	})
	168
	169	static inline unsigned long
	170	copy_from_user(void to, const void __user from, unsigned long n)
	171	{
	172	unsigned long __copy_from = (unsigned long) from;
	173	__kernel_size_t __copy_size = (__kernel_size_t) n;
	174
	175	if (__copy_size && __access_ok(__copy_from, __copy_size))
	176	return __copy_user(to, from, __copy_size);
	177
	178	return __copy_size;
	179	}
	180
	181	static inline unsigned long
	182	copy_to_user(void __user to, const void from, unsigned long n)
	183	{
	184	unsigned long __copy_to = (unsigned long) to;
	185	__kernel_size_t __copy_size = (__kernel_size_t) n;
	186
	187	if (__copy_size && __access_ok(__copy_to, __copy_size))
	188	return __copy_user(to, from, __copy_size);
	189
	190	return __copy_size;
	191	}
	192
	193	/**
	194	* strnlen_user: - Get the size of a string in user space.
	195	* @s: The string to measure.
	196	* @n: The maximum valid length
	197	*
	198	* Context: User context only. This function may sleep.
	199	*
	200	* Get the size of a NUL-terminated string in user space.
	201	*
	202	* Returns the size of the string INCLUDING the terminating NUL.
	203	* On exception, returns 0.
	204	* If the string is too long, returns a value greater than @n.
	205	*/
	206	static inline long strnlen_user(const char __user *s, long n)
	207	{
	208	if (!__addr_ok(s))
	209	return 0;
	210	else
	211	return __strnlen_user(s, n);
	212	}
	213
	214	/**
	215	* strlen_user: - Get the size of a string in user space.
	216	* @str: The string to measure.
	217	*
	218	* Context: User context only. This function may sleep.
	219	*
	220	* Get the size of a NUL-terminated string in user space.
	221	*
	222	* Returns the size of the string INCLUDING the terminating NUL.
	223	* On exception, returns 0.
	224	*
	225	* If there is a limit on the length of a valid string, you may wish to
	226	* consider using strnlen_user() instead.
	227	*/
	228	#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
	229
	230	/*
	231	* The exception table consists of pairs of addresses: the first is the
	232	* address of an instruction that is allowed to fault, and the second is
	233	* the address at which the program should continue. No registers are
	234	* modified, so it is entirely up to the continuation code to figure out
	235	* what to do.
	236	*
	237	* All the routines below use bits of fixup code that are out of line
	238	* with the main instruction path. This means when everything is well,
	239	* we don't even have to jump over them. Further, they do not intrude
	240	* on our cache or tlb entries.
	241	*/
	242	struct exception_table_entry {
	243	unsigned long insn, fixup;
	244	};
	245
	246	#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
	247	#define ARCH_HAS_SEARCH_EXTABLE
	248	#endif
	249
	250	int fixup_exception(struct pt_regs *regs);
	251	/* Returns 0 if exception not found and fixup.unit otherwise. */
	252	unsigned long search_exception_table(unsigned long addr);
	253	const struct exception_table_entry *search_exception_tables(unsigned long addr);
	254
	255
	256	#endif /* __ASM_SH_UACCESS_H */