powerpc: merge uaccess.h

There is still a bug to be fixed and more merging to be done.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

1 files changed, 0 insertions, 393 deletions

diff --git a/include/asm-ppc/uaccess.h b/include/asm-ppc/uaccess.h
deleted file mode 100644
index 63f5622..0000000
--- a/include/asm-ppc/uaccess.h
+++ /dev/null
@@ -1,393 +0,0 @@
-#ifdef __KERNEL__
-#ifndef _PPC_UACCESS_H
-#define _PPC_UACCESS_H
-
-#ifndef __ASSEMBLY__
-#include <linux/sched.h>
-#include <linux/errno.h>
-#include <asm/processor.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.
- *
- * The fs/ds values are now the highest legal address in the "segment".
- * This simplifies the checking in the routines below.
- */
-
-#define KERNEL_DS	((mm_segment_t) { ~0UL })
-#define USER_DS		((mm_segment_t) { TASK_SIZE - 1 })
-
-#define get_ds()	(KERNEL_DS)
-#define get_fs()	(current->thread.fs)
-#define set_fs(val)	(current->thread.fs = (val))
-
-#define segment_eq(a,b)	((a).seg == (b).seg)
-
-#define __access_ok(addr,size)						    \
-	((addr) <= current->thread.fs.seg				    \
-	 && ((size) == 0 || (size) - 1 <= current->thread.fs.seg - (addr)))
-
-#define access_ok(type, addr, size) \
-	(__chk_user_ptr(addr),__access_ok((unsigned long)(addr),(size)))
-
-/*
- * 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;
-};
-
-/*
- * These are the main single-value transfer routines.  They automatically
- * use the right size if we just have the right pointer type.
- *
- * This gets kind of ugly. We want to return _two_ values in "get_user()"
- * and yet we don't want to do any pointers, because that is too much
- * of a performance impact. Thus we have a few rather ugly macros here,
- * and hide all the ugliness from the user.
- *
- * The "__xxx" versions of the user access functions are versions that
- * do not verify the address space, that must have been done previously
- * with a separate "access_ok()" call (this is used when we do multiple
- * accesses to the same area of user memory).
- *
- * As we use the same address space for kernel and user data on the
- * PowerPC, we can just do these as direct assignments.  (Of course, the
- * exception handling means that it's no longer "just"...)
- *
- * The "user64" versions of the user access functions are versions that 
- * allow access of 64-bit data. The "get_user" functions do not 
- * properly handle 64-bit data because the value gets down cast to a long. 
- * The "put_user" functions already handle 64-bit data properly but we add 
- * "user64" versions for completeness
- */
-#define get_user(x,ptr) \
-  __get_user_check((x),(ptr),sizeof(*(ptr)))
-#define get_user64(x,ptr) \
-  __get_user64_check((x),(ptr),sizeof(*(ptr)))
-#define put_user(x,ptr) \
-  __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
-#define put_user64(x,ptr) put_user(x,ptr)
-
-#define __get_user(x,ptr) \
-  __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
-#define __get_user64(x,ptr) \
-  __get_user64_nocheck((x),(ptr),sizeof(*(ptr)))
-#define __put_user(x,ptr) \
-  __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
-#define __put_user64(x,ptr) __put_user(x,ptr)
-
-extern long __put_user_bad(void);
-
-#define __put_user_nocheck(x,ptr,size)			\
-({							\
-	long __pu_err;					\
-	__chk_user_ptr(ptr);				\
-	__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(VERIFY_WRITE,__pu_addr,size))		\
-		__put_user_size((x),__pu_addr,(size),__pu_err);	\
-	__pu_err;						\
-})
-
-#define __put_user_size(x,ptr,size,retval)		\
-do {							\
-	retval = 0;					\
-	switch (size) {					\
-	case 1:						\
-		__put_user_asm(x, ptr, retval, "stb");	\
-		break;					\
-	case 2:						\
-		__put_user_asm(x, ptr, retval, "sth");	\
-		break;					\
-	case 4:						\
-		__put_user_asm(x, ptr, retval, "stw");	\
-		break;					\
-	case 8:						\
-		__put_user_asm2(x, ptr, retval);	\
-		break;					\
-	default:					\
-		__put_user_bad();			\
-	}						\
-} while (0)
-
-/*
- * We don't tell gcc that we are accessing memory, but this is OK
- * because we do not write to any memory gcc knows about, so there
- * are no aliasing issues.
- */
-#define __put_user_asm(x, addr, err, op)			\
-	__asm__ __volatile__(					\
-		"1:	"op" %1,0(%2)\n"			\
-		"2:\n"						\
-		".section .fixup,\"ax\"\n"			\
-		"3:	li %0,%3\n"				\
-		"	b 2b\n"					\
-		".previous\n"					\
-		".section __ex_table,\"a\"\n"			\
-		"	.align 2\n"				\
-		"	.long 1b,3b\n"				\
-		".previous"					\
-		: "=r" (err)					\
-		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-
-#define __put_user_asm2(x, addr, err)				\
-	__asm__ __volatile__(					\
-		"1:	stw %1,0(%2)\n"				\
-		"2:	stw %1+1,4(%2)\n"			\
-		"3:\n"						\
-		".section .fixup,\"ax\"\n"			\
-		"4:	li %0,%3\n"				\
-		"	b 3b\n"					\
-		".previous\n"					\
-		".section __ex_table,\"a\"\n"			\
-		"	.align 2\n"				\
-		"	.long 1b,4b\n"				\
-		"	.long 2b,4b\n"				\
-		".previous"					\
-		: "=r" (err)					\
-		: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
-
-#define __get_user_nocheck(x, ptr, size)			\
-({								\
-	long __gu_err;						\
-	unsigned long __gu_val;					\
-	__chk_user_ptr(ptr);					\
-	__get_user_size(__gu_val, (ptr), (size), __gu_err);	\
-	(x) = (__typeof__(*(ptr)))__gu_val;			\
-	__gu_err;						\
-})
-
-#define __get_user64_nocheck(x, ptr, size)			\
-({								\
-	long __gu_err;						\
-	long long __gu_val;					\
-	__chk_user_ptr(ptr);					\
-	__get_user_size64(__gu_val, (ptr), (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)) __user *__gu_addr = (ptr);		\
-	if (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 __get_user64_check(x, ptr, size)				  \
-({									  \
-	long __gu_err = -EFAULT;					  \
-	long long __gu_val = 0;						  \
-	const __typeof__(*(ptr)) __user *__gu_addr = (ptr);		  \
-	if (access_ok(VERIFY_READ, __gu_addr, (size)))			  \
-		__get_user_size64(__gu_val, __gu_addr, (size), __gu_err); \
-	(x) = (__typeof__(*(ptr)))__gu_val;				  \
-	__gu_err;							  \
-})
-
-extern long __get_user_bad(void);
-
-#define __get_user_size(x, ptr, size, retval)			\
-do {								\
-	retval = 0;						\
-	switch (size) {						\
-	case 1:							\
-		__get_user_asm(x, ptr, retval, "lbz");		\
-		break;						\
-	case 2:							\
-		__get_user_asm(x, ptr, retval, "lhz");		\
-		break;						\
-	case 4:							\
-		__get_user_asm(x, ptr, retval, "lwz");		\
-		break;						\
-	default:						\
-		x = __get_user_bad();				\
-	}							\
-} while (0)
-
-#define __get_user_size64(x, ptr, size, retval)			\
-do {								\
-	retval = 0;						\
-	switch (size) {						\
-	case 1:							\
-		__get_user_asm(x, ptr, retval, "lbz");		\
-		break;						\
-	case 2:							\
-		__get_user_asm(x, ptr, retval, "lhz");		\
-		break;						\
-	case 4:							\
-		__get_user_asm(x, ptr, retval, "lwz");		\
-		break;						\
-	case 8:							\
-		__get_user_asm2(x, ptr, retval);		\
-		break;						\
-	default:						\
-		x = __get_user_bad();				\
-	}							\
-} while (0)
-
-#define __get_user_asm(x, addr, err, op)		\
-	__asm__ __volatile__(				\
-		"1:	"op" %1,0(%2)\n"		\
-		"2:\n"					\
-		".section .fixup,\"ax\"\n"		\
-		"3:	li %0,%3\n"			\
-		"	li %1,0\n"			\
-		"	b 2b\n"				\
-		".previous\n"				\
-		".section __ex_table,\"a\"\n"		\
-		"	.align 2\n"			\
-		"	.long 1b,3b\n"			\
-		".previous"				\
-		: "=r"(err), "=r"(x)			\
-		: "b"(addr), "i"(-EFAULT), "0"(err))
-
-#define __get_user_asm2(x, addr, err)			\
-	__asm__ __volatile__(				\
-		"1:	lwz %1,0(%2)\n"			\
-		"2:	lwz %1+1,4(%2)\n"		\
-		"3:\n"					\
-		".section .fixup,\"ax\"\n"		\
-		"4:	li %0,%3\n"			\
-		"	li %1,0\n"			\
-		"	li %1+1,0\n"			\
-		"	b 3b\n"				\
-		".previous\n"				\
-		".section __ex_table,\"a\"\n"		\
-		"	.align 2\n"			\
-		"	.long 1b,4b\n"			\
-		"	.long 2b,4b\n"			\
-		".previous"				\
-		: "=r"(err), "=&r"(x)			\
-		: "b"(addr), "i"(-EFAULT), "0"(err))
-
-/* more complex routines */
-
-extern int __copy_tofrom_user(void __user *to, const void __user *from,
-			      unsigned long size);
-
-extern inline unsigned long
-copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	unsigned long over;
-
-	if (access_ok(VERIFY_READ, from, n))
-		return __copy_tofrom_user((__force void __user *)to, from, n);
-	if ((unsigned long)from < TASK_SIZE) {
-		over = (unsigned long)from + n - TASK_SIZE;
-		return __copy_tofrom_user((__force void __user *)to, from, n - over) + over;
-	}
-	return n;
-}
-
-extern inline unsigned long
-copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	unsigned long over;
-
-	if (access_ok(VERIFY_WRITE, to, n))
-		return __copy_tofrom_user(to, (__force void __user *) from, n);
-	if ((unsigned long)to < TASK_SIZE) {
-		over = (unsigned long)to + n - TASK_SIZE;
-		return __copy_tofrom_user(to, (__force void __user *) from, n - over) + over;
-	}
-	return n;
-}
-
-static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long size)
-{
-	return __copy_tofrom_user((__force void __user *)to, from, size);
-}
-
-static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long size)
-{
-	return __copy_tofrom_user(to, (__force void __user *)from, size);
-}
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-extern unsigned long __clear_user(void __user *addr, unsigned long size);
-
-extern inline unsigned long
-clear_user(void __user *addr, unsigned long size)
-{
-	if (access_ok(VERIFY_WRITE, addr, size))
-		return __clear_user(addr, size);
-	if ((unsigned long)addr < TASK_SIZE) {
-		unsigned long over = (unsigned long)addr + size - TASK_SIZE;
-		return __clear_user(addr, size - over) + over;
-	}
-	return size;
-}
-
-extern int __strncpy_from_user(char *dst, const char __user *src, long count);
-
-extern inline long
-strncpy_from_user(char *dst, const char __user *src, long count)
-{
-	if (access_ok(VERIFY_READ, src, 1))
-		return __strncpy_from_user(dst, src, count);
-	return -EFAULT;
-}
-
-/*
- * Return the size of a string (including the ending 0)
- *
- * Return 0 for error
- */
-
-extern int __strnlen_user(const char __user *str, long len, unsigned long top);
-
-/*
- * Returns the length of the string at str (including the null byte),
- * or 0 if we hit a page we can't access,
- * or something > len if we didn't find a null byte.
- *
- * The `top' parameter to __strnlen_user is to make sure that
- * we can never overflow from the user area into kernel space.
- */
-extern __inline__ int strnlen_user(const char __user *str, long len)
-{
-	unsigned long top = current->thread.fs.seg;
-
-	if ((unsigned long)str > top)
-		return 0;
-	return __strnlen_user(str, len, top);
-}
-
-#define strlen_user(str)	strnlen_user((str), 0x7ffffffe)
-
-#endif  /* __ASSEMBLY__ */
-
-#endif	/* _PPC_UACCESS_H */
-#endif /* __KERNEL__ */