Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 490 insertions, 0 deletions

diff --git a/arch/mn10300/include/asm/uaccess.h b/arch/mn10300/include/asm/uaccess.h
new file mode 100644
index 00000000000..8a3a4dd5576
--- /dev/null
+++ b/arch/mn10300/include/asm/uaccess.h
@@ -0,0 +1,490 @@
+/* MN10300 userspace access functions
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/errno.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, these macros are grossly misnamed.
+ */
+
+#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
+
+#define KERNEL_XDS	MAKE_MM_SEG(0xBFFFFFFF)
+#define KERNEL_DS	MAKE_MM_SEG(0x9FFFFFFF)
+#define USER_DS		MAKE_MM_SEG(TASK_SIZE)
+
+#define get_ds()	(KERNEL_DS)
+#define get_fs()	(current_thread_info()->addr_limit)
+#define set_fs(x)	(current_thread_info()->addr_limit = (x))
+#define __kernel_ds_p() (current_thread_info()->addr_limit.seg == 0x9FFFFFFF)
+
+#define segment_eq(a, b) ((a).seg == (b).seg)
+
+#define __addr_ok(addr) \
+	((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
+
+/*
+ * check that a range of addresses falls within the current address limit
+ */
+static inline int ___range_ok(unsigned long addr, unsigned int size)
+{
+	int flag = 1, tmp;
+
+	asm("	add	%3,%1	\n"	/* set C-flag if addr + size > 4Gb */
+	    "	bcs	0f	\n"
+	    "	cmp	%4,%1	\n"	/* jump if addr+size>limit (error) */
+	    "	bhi	0f	\n"
+	    "	clr	%0	\n"	/* mark okay */
+	    "0:			\n"
+	    : "=r"(flag), "=&r"(tmp)
+	    : "1"(addr), "ir"(size),
+	      "r"(current_thread_info()->addr_limit.seg), "0"(flag)
+	    : "cc"
+	    );
+
+	return flag;
+}
+
+#define __range_ok(addr, size) ___range_ok((unsigned long)(addr), (u32)(size))
+
+#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
+#define __access_ok(addr, size)     (__range_ok((addr), (size)) == 0)
+
+static inline int verify_area(int type, const void *addr, unsigned long size)
+{
+	return access_ok(type, addr, size) ? 0 : -EFAULT;
+}
+
+
+/*
+ * 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;
+};
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+extern int fixup_exception(struct pt_regs *regs);
+
+#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)))
+
+/*
+ * The "xxx_ret" versions return constant specified in third argument, if
+ * something bad happens. These macros can be optimized for the
+ * case of just returning from the function xxx_ret is used.
+ */
+
+#define put_user_ret(x, ptr, ret) \
+	({ if (put_user((x), (ptr)))	return (ret); })
+#define get_user_ret(x, ptr, ret) \
+	({ if (get_user((x), (ptr)))	return (ret); })
+#define __put_user_ret(x, ptr, ret) \
+	({ if (__put_user((x), (ptr)))	return (ret); })
+#define __get_user_ret(x, ptr, ret) \
+	({ if (__get_user((x), (ptr)))	return (ret); })
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct *)(x))
+
+#define __get_user_nocheck(x, ptr, size)	\
+({						\
+	__typeof(*(ptr)) __gu_val;		\
+	unsigned long __gu_addr;		\
+	int __gu_err;				\
+	__gu_addr = (unsigned long) (ptr);	\
+	switch (size) {				\
+	case 1:  __get_user_asm("bu"); break;	\
+	case 2:  __get_user_asm("hu"); break;	\
+	case 4:  __get_user_asm(""  ); break;	\
+	default: __get_user_unknown(); break;	\
+	}					\
+	x = (__typeof__(*(ptr))) __gu_val;	\
+	__gu_err;				\
+})
+
+#define __get_user_check(x, ptr, size)			\
+({							\
+	__typeof__(*(ptr)) __gu_val;			\
+	unsigned long __gu_addr;			\
+	int __gu_err;					\
+	__gu_addr = (unsigned long) (ptr);		\
+	if (likely(__access_ok(__gu_addr,size))) {	\
+		switch (size) {				\
+		case 1:  __get_user_asm("bu"); break;	\
+		case 2:  __get_user_asm("hu"); break;	\
+		case 4:  __get_user_asm(""  ); break;	\
+		default: __get_user_unknown(); break;	\
+		}					\
+	}						\
+	else {						\
+		__gu_err = -EFAULT;			\
+		__gu_val = 0;				\
+	}						\
+	x = (__typeof__(*(ptr))) __gu_val;		\
+	__gu_err;					\
+})
+
+#define __get_user_asm(INSN)					\
+({								\
+	asm volatile(					\
+		"1:\n"						\
+		"	mov"INSN"	%2,%1\n"		\
+		"	mov		0,%0\n"			\
+		"2:\n"						\
+		"	.section	.fixup,\"ax\"\n"	\
+		"3:\n\t"					\
+		"	mov		%3,%0\n"		\
+		"	jmp		2b\n"			\
+		"	.previous\n"				\
+		"	.section	__ex_table,\"a\"\n"	\
+		"	.balign		4\n"			\
+		"	.long		1b, 3b\n"		\
+		"	.previous"				\
+		: "=&r" (__gu_err), "=&r" (__gu_val)		\
+		: "m" (__m(__gu_addr)), "i" (-EFAULT));		\
+})
+
+extern int __get_user_unknown(void);
+
+#define __put_user_nocheck(x, ptr, size)			\
+({								\
+	union {							\
+		__typeof__(*(ptr)) val;				\
+		u32 bits[2];					\
+	} __pu_val;						\
+	unsigned long __pu_addr;				\
+	int __pu_err;						\
+	__pu_val.val = (x);					\
+	__pu_addr = (unsigned long) (ptr);			\
+	switch (size) {						\
+	case 1:  __put_user_asm("bu"); break;			\
+	case 2:  __put_user_asm("hu"); break;			\
+	case 4:  __put_user_asm(""  ); break;			\
+	case 8:  __put_user_asm8();    break;			\
+	default: __pu_err = __put_user_unknown(); break;	\
+	}							\
+	__pu_err;						\
+})
+
+#define __put_user_check(x, ptr, size)					\
+({									\
+	union {								\
+		__typeof__(*(ptr)) val;					\
+		u32 bits[2];						\
+	} __pu_val;							\
+	unsigned long __pu_addr;					\
+	int __pu_err;							\
+	__pu_val.val = (x);						\
+	__pu_addr = (unsigned long) (ptr);				\
+	if (likely(__access_ok(__pu_addr, size))) {			\
+		switch (size) {						\
+		case 1:  __put_user_asm("bu"); break;			\
+		case 2:  __put_user_asm("hu"); break;			\
+		case 4:  __put_user_asm(""  ); break;			\
+		case 8:  __put_user_asm8();    break;			\
+		default: __pu_err = __put_user_unknown(); break;	\
+		}							\
+	}								\
+	else {								\
+		__pu_err = -EFAULT;					\
+	}								\
+	__pu_err;							\
+})
+
+#define __put_user_asm(INSN)					\
+({								\
+	asm volatile(						\
+		"1:\n"						\
+		"	mov"INSN"	%1,%2\n"		\
+		"	mov		0,%0\n"			\
+		"2:\n"						\
+		"	.section	.fixup,\"ax\"\n"	\
+		"3:\n"						\
+		"	mov		%3,%0\n"		\
+		"	jmp		2b\n"			\
+		"	.previous\n"				\
+		"	.section	__ex_table,\"a\"\n"	\
+		"	.balign		4\n"			\
+		"	.long		1b, 3b\n"		\
+		"	.previous"				\
+		: "=&r" (__pu_err)				\
+		: "r" (__pu_val.val), "m" (__m(__pu_addr)),	\
+		  "i" (-EFAULT)					\
+		);						\
+})
+
+#define __put_user_asm8()						\
+({									\
+	asm volatile(							\
+		"1:	mov		%1,%3		\n"		\
+		"2:	mov		%2,%4		\n"		\
+		"	mov		0,%0		\n"		\
+		"3:					\n"		\
+		"	.section	.fixup,\"ax\"	\n"		\
+		"4:					\n"		\
+		"	mov		%5,%0		\n"		\
+		"	jmp		3b		\n"		\
+		"	.previous			\n"		\
+		"	.section	__ex_table,\"a\"\n"		\
+		"	.balign		4		\n"		\
+		"	.long		1b, 4b		\n"		\
+		"	.long		2b, 4b		\n"		\
+		"	.previous			\n"		\
+		: "=&r" (__pu_err)					\
+		: "r" (__pu_val.bits[0]), "r" (__pu_val.bits[1]),	\
+		  "m" (__m(__pu_addr)), "m" (__m(__pu_addr+4)),		\
+		  "i" (-EFAULT)						\
+		);							\
+})
+
+extern int __put_user_unknown(void);
+
+
+/*
+ * Copy To/From Userspace
+ */
+/* Generic arbitrary sized copy.  */
+#define __copy_user(to, from, size)					\
+do {									\
+	if (size) {							\
+		void *__to = to;					\
+		const void *__from = from;				\
+		int w;							\
+		asm volatile(						\
+			"0:     movbu	(%0),%3;\n"			\
+			"1:     movbu	%3,(%1);\n"			\
+			"	inc	%0;\n"				\
+			"	inc	%1;\n"				\
+			"       add	-1,%2;\n"			\
+			"       bne	0b;\n"				\
+			"2:\n"						\
+			"	.section .fixup,\"ax\"\n"		\
+			"3:	jmp	2b\n"				\
+			"	.previous\n"				\
+			"	.section __ex_table,\"a\"\n"		\
+			"       .balign	4\n"				\
+			"       .long	0b,3b\n"			\
+			"       .long	1b,3b\n"			\
+			"	.previous\n"				\
+			: "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
+			: "0"(__from), "1"(__to), "2"(size)		\
+			: "memory");					\
+	}								\
+} while (0)
+
+#define __copy_user_zeroing(to, from, size)				\
+do {									\
+	if (size) {							\
+		void *__to = to;					\
+		const void *__from = from;				\
+		int w;							\
+		asm volatile(						\
+			"0:     movbu	(%0),%3;\n"			\
+			"1:     movbu	%3,(%1);\n"			\
+			"	inc	%0;\n"				\
+			"	inc	%1;\n"				\
+			"       add	-1,%2;\n"			\
+			"       bne	0b;\n"				\
+			"2:\n"						\
+			"	.section .fixup,\"ax\"\n"		\
+			"3:\n"						\
+			"	mov	%2,%0\n"			\
+			"	clr	%3\n"				\
+			"4:     movbu	%3,(%1);\n"			\
+			"	inc	%1;\n"				\
+			"       add	-1,%2;\n"			\
+			"       bne	4b;\n"				\
+			"	mov	%0,%2\n"			\
+			"	jmp	2b\n"				\
+			"	.previous\n"				\
+			"	.section __ex_table,\"a\"\n"		\
+			"       .balign	4\n"				\
+			"       .long	0b,3b\n"			\
+			"       .long	1b,3b\n"			\
+			"	.previous\n"				\
+			: "=a"(__from), "=a"(__to), "=r"(size), "=&r"(w)\
+			: "0"(__from), "1"(__to), "2"(size)		\
+			: "memory");					\
+	}								\
+} while (0)
+
+/* We let the __ versions of copy_from/to_user inline, because they're often
+ * used in fast paths and have only a small space overhead.
+ */
+static inline
+unsigned long __generic_copy_from_user_nocheck(void *to, const void *from,
+					       unsigned long n)
+{
+	__copy_user_zeroing(to, from, n);
+	return n;
+}
+
+static inline
+unsigned long __generic_copy_to_user_nocheck(void *to, const void *from,
+					     unsigned long n)
+{
+	__copy_user(to, from, n);
+	return n;
+}
+
+
+#if 0
+#error don't use - these macros don't increment to & from pointers
+/* Optimize just a little bit when we know the size of the move. */
+#define __constant_copy_user(to, from, size)	\
+do {						\
+	asm volatile(				\
+		"       mov %0,a0;\n"		\
+		"0:     movbu (%1),d3;\n"	\
+		"1:     movbu d3,(%2);\n"	\
+		"       add -1,a0;\n"		\
+		"       bne 0b;\n"		\
+		"2:;"				\
+		".section .fixup,\"ax\"\n"	\
+		"3:	jmp 2b\n"		\
+		".previous\n"			\
+		".section __ex_table,\"a\"\n"	\
+		"       .balign 4\n"		\
+		"       .long 0b,3b\n"		\
+		"       .long 1b,3b\n"		\
+		".previous"			\
+		:				\
+		: "d"(size), "d"(to), "d"(from)	\
+		: "d3", "a0");			\
+} while (0)
+
+/* Optimize just a little bit when we know the size of the move. */
+#define __constant_copy_user_zeroing(to, from, size)	\
+do {							\
+	asm volatile(					\
+		"       mov %0,a0;\n"			\
+		"0:     movbu (%1),d3;\n"		\
+		"1:     movbu d3,(%2);\n"		\
+		"       add -1,a0;\n"			\
+		"       bne 0b;\n"			\
+		"2:;"					\
+		".section .fixup,\"ax\"\n"		\
+		"3:	jmp 2b\n"			\
+		".previous\n"				\
+		".section __ex_table,\"a\"\n"		\
+		"       .balign 4\n"			\
+		"       .long 0b,3b\n"			\
+		"       .long 1b,3b\n"			\
+		".previous"				\
+		:					\
+		: "d"(size), "d"(to), "d"(from)		\
+		: "d3", "a0");				\
+} while (0)
+
+static inline
+unsigned long __constant_copy_to_user(void *to, const void *from,
+				      unsigned long n)
+{
+	if (access_ok(VERIFY_WRITE, to, n))
+		__constant_copy_user(to, from, n);
+	return n;
+}
+
+static inline
+unsigned long __constant_copy_from_user(void *to, const void *from,
+					unsigned long n)
+{
+	if (access_ok(VERIFY_READ, from, n))
+		__constant_copy_user_zeroing(to, from, n);
+	return n;
+}
+
+static inline
+unsigned long __constant_copy_to_user_nocheck(void *to, const void *from,
+					      unsigned long n)
+{
+	__constant_copy_user(to, from, n);
+	return n;
+}
+
+static inline
+unsigned long __constant_copy_from_user_nocheck(void *to, const void *from,
+						unsigned long n)
+{
+	__constant_copy_user_zeroing(to, from, n);
+	return n;
+}
+#endif
+
+extern unsigned long __generic_copy_to_user(void __user *, const void *,
+					    unsigned long);
+extern unsigned long __generic_copy_from_user(void *, const void __user *,
+					      unsigned long);
+
+#define __copy_to_user_inatomic(to, from, n) \
+	__generic_copy_to_user_nocheck((to), (from), (n))
+#define __copy_from_user_inatomic(to, from, n) \
+	__generic_copy_from_user_nocheck((to), (from), (n))
+
+#define __copy_to_user(to, from, n)			\
+({							\
+	might_sleep();					\
+	__copy_to_user_inatomic((to), (from), (n));	\
+})
+
+#define __copy_from_user(to, from, n)			\
+({							\
+	might_sleep();					\
+	__copy_from_user_inatomic((to), (from), (n));	\
+})
+
+
+#define copy_to_user(to, from, n)   __generic_copy_to_user((to), (from), (n))
+#define copy_from_user(to, from, n) __generic_copy_from_user((to), (from), (n))
+
+extern long strncpy_from_user(char *dst, const char __user *src, long count);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+extern long strnlen_user(const char __user *str, long n);
+#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
+extern unsigned long clear_user(void __user *mem, unsigned long len);
+extern unsigned long __clear_user(void __user *mem, unsigned long len);
+
+#endif /* _ASM_UACCESS_H */