sh: Split out uaccess.h in to _32 and _64 variants.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 575 insertions, 0 deletions

diff --git a/include/asm-sh/uaccess_32.h b/include/asm-sh/uaccess_32.h
new file mode 100644
index 000000000000..f18a1a5c95c0
--- /dev/null
+++ b/include/asm-sh/uaccess_32.h
@@ -0,0 +1,575 @@
+/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
+ *
+ * User space memory access functions
+ *
+ * Copyright (C) 1999, 2002  Niibe Yutaka
+ * Copyright (C) 2003  Paul Mundt
+ *
+ *  Based on:
+ *     MIPS implementation version 1.15 by
+ *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
+ *     and i386 version.
+ */
+#ifndef __ASM_SH_UACCESS_H
+#define __ASM_SH_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+
+#define VERIFY_READ    0
+#define VERIFY_WRITE   1
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not.  If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons (Data Segment Register?), these macros are misnamed.
+ */
+
+#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
+
+#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
+#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
+
+#define segment_eq(a,b)	((a).seg == (b).seg)
+
+#define get_ds()	(KERNEL_DS)
+
+#if !defined(CONFIG_MMU)
+/* NOMMU is always true */
+#define __addr_ok(addr) (1)
+
+static inline mm_segment_t get_fs(void)
+{
+	return USER_DS;
+}
+
+static inline void set_fs(mm_segment_t s)
+{
+}
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * If we don't have an MMU (or if its disabled) the only thing we really have
+ * to look out for is if the address resides somewhere outside of what
+ * available RAM we have.
+ *
+ * TODO: This check could probably also stand to be restricted somewhat more..
+ * though it still does the Right Thing(tm) for the time being.
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+	return ((addr >= memory_start) && ((addr + size) < memory_end));
+}
+#else /* CONFIG_MMU */
+#define __addr_ok(addr) \
+	((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
+
+#define get_fs()	(current_thread_info()->addr_limit)
+#define set_fs(x)	(current_thread_info()->addr_limit = (x))
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * We do three checks:
+ * (1) is it user space?
+ * (2) addr + size --> carry?
+ * (3) addr + size >= 0x80000000  (PAGE_OFFSET)
+ *
+ * (1) (2) (3) | RESULT
+ *  0   0   0  |  ok
+ *  0   0   1  |  ok
+ *  0   1   0  |  bad
+ *  0   1   1  |  bad
+ *  1   0   0  |  ok
+ *  1   0   1  |  bad
+ *  1   1   0  |  bad
+ *  1   1   1  |  bad
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+	unsigned long flag, tmp;
+
+	__asm__("stc	r7_bank, %0\n\t"
+		"mov.l	@(8,%0), %0\n\t"
+		"clrt\n\t"
+		"addc	%2, %1\n\t"
+		"and	%1, %0\n\t"
+		"rotcl	%0\n\t"
+		"rotcl	%0\n\t"
+		"and	#3, %0"
+		: "=&z" (flag), "=r" (tmp)
+		: "r" (addr), "1" (size)
+		: "t");
+
+	return flag == 0;
+}
+#endif /* CONFIG_MMU */
+
+static inline int access_ok(int type, const void __user *p, unsigned long size)
+{
+	unsigned long addr = (unsigned long)p;
+	return __access_ok(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((__typeof__(*(ptr)))(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_size(x,ptr,size,retval)			\
+do {								\
+	retval = 0;						\
+	__chk_user_ptr(ptr);					\
+	switch (size) {						\
+	case 1:							\
+		__get_user_asm(x, ptr, retval, "b");		\
+		break;						\
+	case 2:							\
+		__get_user_asm(x, ptr, retval, "w");		\
+		break;						\
+	case 4:							\
+		__get_user_asm(x, ptr, retval, "l");		\
+		break;						\
+	default:						\
+		__get_user_unknown();				\
+		break;						\
+	}							\
+} while (0)
+
+#define __get_user_nocheck(x,ptr,size)				\
+({								\
+	long __gu_err, __gu_val;				\
+	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
+	(x) = (__typeof__(*(ptr)))__gu_val;			\
+	__gu_err;						\
+})
+
+#ifdef CONFIG_MMU
+#define __get_user_check(x,ptr,size)				\
+({								\
+	long __gu_err, __gu_val;				\
+	__chk_user_ptr(ptr);					\
+	switch (size) {						\
+	case 1:							\
+		__get_user_1(__gu_val, (ptr), __gu_err);	\
+		break;						\
+	case 2:							\
+		__get_user_2(__gu_val, (ptr), __gu_err);	\
+		break;						\
+	case 4:							\
+		__get_user_4(__gu_val, (ptr), __gu_err);	\
+		break;						\
+	default:						\
+		__get_user_unknown();				\
+		break;						\
+	}							\
+								\
+	(x) = (__typeof__(*(ptr)))__gu_val;			\
+	__gu_err;						\
+})
+
+#define __get_user_1(x,addr,err) ({		\
+__asm__("stc	r7_bank, %1\n\t"		\
+	"mov.l	@(8,%1), %1\n\t"		\
+	"and	%2, %1\n\t"			\
+	"cmp/pz	%1\n\t"				\
+	"bt/s	1f\n\t"				\
+	" mov	#0, %0\n\t"			\
+	"0:\n"					\
+	"mov	#-14, %0\n\t"			\
+	"bra	2f\n\t"				\
+	" mov	#0, %1\n"			\
+	"1:\n\t"				\
+	"mov.b	@%2, %1\n\t"			\
+	"extu.b	%1, %1\n"			\
+	"2:\n"					\
+	".section	__ex_table,\"a\"\n\t"	\
+	".long	1b, 0b\n\t"			\
+	".previous"				\
+	: "=&r" (err), "=&r" (x)		\
+	: "r" (addr)				\
+	: "t");					\
+})
+
+#define __get_user_2(x,addr,err) ({		\
+__asm__("stc	r7_bank, %1\n\t"		\
+	"mov.l	@(8,%1), %1\n\t"		\
+	"and	%2, %1\n\t"			\
+	"cmp/pz	%1\n\t"				\
+	"bt/s	1f\n\t"				\
+	" mov	#0, %0\n\t"			\
+	"0:\n"					\
+	"mov	#-14, %0\n\t"			\
+	"bra	2f\n\t"				\
+	" mov	#0, %1\n"			\
+	"1:\n\t"				\
+	"mov.w	@%2, %1\n\t"			\
+	"extu.w	%1, %1\n"			\
+	"2:\n"					\
+	".section	__ex_table,\"a\"\n\t"	\
+	".long	1b, 0b\n\t"			\
+	".previous"				\
+	: "=&r" (err), "=&r" (x)		\
+	: "r" (addr)				\
+	: "t");					\
+})
+
+#define __get_user_4(x,addr,err) ({		\
+__asm__("stc	r7_bank, %1\n\t"		\
+	"mov.l	@(8,%1), %1\n\t"		\
+	"and	%2, %1\n\t"			\
+	"cmp/pz	%1\n\t"				\
+	"bt/s	1f\n\t"				\
+	" mov	#0, %0\n\t"			\
+	"0:\n"					\
+	"mov	#-14, %0\n\t"			\
+	"bra	2f\n\t"				\
+	" mov	#0, %1\n"			\
+	"1:\n\t"				\
+	"mov.l	@%2, %1\n\t"			\
+	"2:\n"					\
+	".section	__ex_table,\"a\"\n\t"	\
+	".long	1b, 0b\n\t"			\
+	".previous"				\
+	: "=&r" (err), "=&r" (x)		\
+	: "r" (addr)				\
+	: "t");					\
+})
+#else /* CONFIG_MMU */
+#define __get_user_check(x,ptr,size)					\
+({									\
+	long __gu_err, __gu_val;					\
+	if (__access_ok((unsigned long)(ptr), (size))) {		\
+		__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
+		(x) = (__typeof__(*(ptr)))__gu_val;			\
+	} else								\
+		__gu_err = -EFAULT;					\
+	__gu_err;							\
+})
+#endif
+
+#define __get_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov." insn "	%2, %1\n\t" \
+	"mov	#0, %0\n" \
+	"2:\n" \
+	".section	.fixup,\"ax\"\n" \
+	"3:\n\t" \
+	"mov	#0, %1\n\t" \
+	"mov.l	4f, %0\n\t" \
+	"jmp	@%0\n\t" \
+	" mov	%3, %0\n" \
+	"4:	.long	2b\n\t" \
+	".previous\n" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	:"=&r" (err), "=&r" (x) \
+	:"m" (__m(addr)), "i" (-EFAULT)); })
+
+extern void __get_user_unknown(void);
+
+#define __put_user_size(x,ptr,size,retval)		\
+do {							\
+	retval = 0;					\
+	__chk_user_ptr(ptr);				\
+	switch (size) {					\
+	case 1:						\
+		__put_user_asm(x, ptr, retval, "b");	\
+		break;					\
+	case 2:						\
+		__put_user_asm(x, ptr, retval, "w");	\
+		break;					\
+	case 4:						\
+		__put_user_asm(x, ptr, retval, "l");	\
+		break;					\
+	case 8:						\
+		__put_user_u64(x, ptr, retval);		\
+		break;					\
+	default:					\
+		__put_user_unknown();			\
+	}						\
+} while (0)
+
+#define __put_user_nocheck(x,ptr,size)			\
+({							\
+	long __pu_err;					\
+	__put_user_size((x),(ptr),(size),__pu_err);	\
+	__pu_err;					\
+})
+
+#define __put_user_check(x,ptr,size)				\
+({								\
+	long __pu_err = -EFAULT;				\
+	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
+								\
+	if (__access_ok((unsigned long)__pu_addr,size))		\
+		__put_user_size((x),__pu_addr,(size),__pu_err);	\
+	__pu_err;						\
+})
+
+#define __put_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov." insn "	%1, %2\n\t" \
+	"mov	#0, %0\n" \
+	"2:\n" \
+	".section	.fixup,\"ax\"\n" \
+	"3:\n\t" \
+	"nop\n\t" \
+	"mov.l	4f, %0\n\t" \
+	"jmp	@%0\n\t" \
+	"mov	%3, %0\n" \
+	"4:	.long	2b\n\t" \
+	".previous\n" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	:"=&r" (err) \
+	:"r" (x), "m" (__m(addr)), "i" (-EFAULT) \
+        :"memory"); })
+
+#if defined(__LITTLE_ENDIAN__)
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov.l	%R1,%2\n\t" \
+	"mov.l	%S1,%T2\n\t" \
+	"mov	#0,%0\n" \
+	"2:\n" \
+	".section	.fixup,\"ax\"\n" \
+	"3:\n\t" \
+	"nop\n\t" \
+	"mov.l	4f,%0\n\t" \
+	"jmp	@%0\n\t" \
+	" mov	%3,%0\n" \
+	"4:	.long	2b\n\t" \
+	".previous\n" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	: "=r" (retval) \
+	: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+        : "memory"); })
+#else
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov.l	%S1,%2\n\t" \
+	"mov.l	%R1,%T2\n\t" \
+	"mov	#0,%0\n" \
+	"2:\n" \
+	".section	.fixup,\"ax\"\n" \
+	"3:\n\t" \
+	"nop\n\t" \
+	"mov.l	4f,%0\n\t" \
+	"jmp	@%0\n\t" \
+	" mov	%3,%0\n" \
+	"4:	.long	2b\n\t" \
+	".previous\n" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	: "=r" (retval) \
+	: "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+        : "memory"); })
+#endif
+
+extern void __put_user_unknown(void);
+
+/* 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);
+
+#define copy_to_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+#define copy_from_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+void *__copy_from = (void *) (from); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+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.)
+ */
+extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
+
+#define clear_user(addr,n) ({ \
+void * __cl_addr = (addr); \
+unsigned long __cl_size = (n); \
+if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
+__cl_size = __clear_user(__cl_addr, __cl_size); \
+__cl_size; })
+
+static __inline__ int
+__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
+{
+	__kernel_size_t res;
+	unsigned long __dummy, _d, _s;
+
+	__asm__ __volatile__(
+		"9:\n"
+		"mov.b	@%2+, %1\n\t"
+		"cmp/eq	#0, %1\n\t"
+		"bt/s	2f\n"
+		"1:\n"
+		"mov.b	%1, @%3\n\t"
+		"dt	%7\n\t"
+		"bf/s	9b\n\t"
+		" add	#1, %3\n\t"
+		"2:\n\t"
+		"sub	%7, %0\n"
+		"3:\n"
+		".section .fixup,\"ax\"\n"
+		"4:\n\t"
+		"mov.l	5f, %1\n\t"
+		"jmp	@%1\n\t"
+		" mov	%8, %0\n\t"
+		".balign 4\n"
+		"5:	.long 3b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.balign 4\n"
+		"	.long 9b,4b\n"
+		".previous"
+		: "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d)
+		: "0" (__count), "2" (__src), "3" (__dest), "r" (__count),
+		  "i" (-EFAULT)
+		: "memory", "t");
+
+	return res;
+}
+
+#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; })
+
+/*
+ * Return the size of a string (including the ending 0!)
+ */
+static __inline__ long __strnlen_user(const char __user *__s, long __n)
+{
+	unsigned long res;
+	unsigned long __dummy;
+
+	__asm__ __volatile__(
+		"9:\n"
+		"cmp/eq	%4, %0\n\t"
+		"bt	2f\n"
+		"1:\t"
+		"mov.b	@(%0,%3), %1\n\t"
+		"tst	%1, %1\n\t"
+		"bf/s	9b\n\t"
+		" add	#1, %0\n"
+		"2:\n"
+		".section .fixup,\"ax\"\n"
+		"3:\n\t"
+		"mov.l	4f, %1\n\t"
+		"jmp	@%1\n\t"
+		" mov	#0, %0\n"
+		".balign 4\n"
+		"4:	.long 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.balign 4\n"
+		"	.long 1b,3b\n"
+		".previous"
+		: "=z" (res), "=&r" (__dummy)
+		: "0" (0), "r" (__s), "r" (__n)
+		: "t");
+	return res;
+}
+
+static __inline__ long strnlen_user(const char __user *s, long n)
+{
+	if (!__addr_ok(s))
+		return 0;
+	else
+		return __strnlen_user(s, n);
+}
+
+#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;
+};
+
+extern int fixup_exception(struct pt_regs *regs);
+
+#endif /* __ASM_SH_UACCESS_H */