Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 400 insertions, 0 deletions

diff --git a/include/asm-ppc/uaccess.h b/include/asm-ppc/uaccess.h
new file mode 100644
index 000000000000..b044ae03ac56
--- /dev/null
+++ b/include/asm-ppc/uaccess.h
@@ -0,0 +1,400 @@
+#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)))
+
+/* this function will go away soon - use access_ok() instead */
+extern inline int __deprecated verify_area(int type, const void __user * 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;
+};
+
+/*
+ * 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__ */