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, 436 insertions, 0 deletions

diff --git a/include/asm-s390/uaccess.h b/include/asm-s390/uaccess.h
new file mode 100644
index 0000000..a7f43a2
--- /dev/null
+++ b/include/asm-s390/uaccess.h
@@ -0,0 +1,436 @@
+/*
+ *  include/asm-s390/uaccess.h
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Hartmut Penner (hp@de.ibm.com),
+ *               Martin Schwidefsky (schwidefsky@de.ibm.com)
+ *
+ *  Derived from "include/asm-i386/uaccess.h"
+ */
+#ifndef __S390_UACCESS_H
+#define __S390_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/sched.h>
+#include <linux/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(a)  ((mm_segment_t) { (a) })
+
+
+#define KERNEL_DS       MAKE_MM_SEG(0)
+#define USER_DS         MAKE_MM_SEG(1)
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current->thread.mm_segment)
+
+#ifdef __s390x__
+#define set_fs(x) \
+({									\
+	unsigned long __pto;						\
+	current->thread.mm_segment = (x);				\
+	__pto = current->thread.mm_segment.ar4 ?			\
+		S390_lowcore.user_asce : S390_lowcore.kernel_asce;	\
+	asm volatile ("lctlg 7,7,%0" : : "m" (__pto) );			\
+})
+#else
+#define set_fs(x) \
+({									\
+	unsigned long __pto;						\
+	current->thread.mm_segment = (x);				\
+	__pto = current->thread.mm_segment.ar4 ?			\
+		S390_lowcore.user_asce : S390_lowcore.kernel_asce;	\
+	asm volatile ("lctl  7,7,%0" : : "m" (__pto) );			\
+})
+#endif
+
+#define segment_eq(a,b) ((a).ar4 == (b).ar4)
+
+
+#define __access_ok(addr,size) (1)
+
+#define access_ok(type,addr,size) __access_ok(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;
+};
+
+#ifndef __s390x__
+#define __uaccess_fixup \
+	".section .fixup,\"ax\"\n"	\
+	"2: lhi    %0,%4\n"		\
+	"   bras   1,3f\n"		\
+	"   .long  1b\n"		\
+	"3: l      1,0(1)\n"		\
+	"   br     1\n"			\
+	".previous\n"			\
+	".section __ex_table,\"a\"\n"	\
+	"   .align 4\n"			\
+	"   .long  0b,2b\n"		\
+	".previous"
+#define __uaccess_clobber "cc", "1"
+#else /* __s390x__ */
+#define __uaccess_fixup \
+	".section .fixup,\"ax\"\n"	\
+	"2: lghi   %0,%4\n"		\
+	"   jg     1b\n"		\
+	".previous\n"			\
+	".section __ex_table,\"a\"\n"	\
+	"   .align 8\n"			\
+	"   .quad  0b,2b\n"		\
+	".previous"
+#define __uaccess_clobber "cc"
+#endif /* __s390x__ */
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ */
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+#define __put_user_asm(x, ptr, err) \
+({								\
+	err = 0;						\
+	asm volatile(						\
+		"0: mvcs  0(%1,%2),%3,%0\n"			\
+		"1:\n"						\
+		__uaccess_fixup					\
+		: "+&d" (err)					\
+		: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x),	\
+		  "K" (-EFAULT)					\
+		: __uaccess_clobber );				\
+})
+#else
+#define __put_user_asm(x, ptr, err) \
+({								\
+	err = 0;						\
+	asm volatile(						\
+		"0: mvcs  0(%1,%2),0(%3),%0\n"			\
+		"1:\n"						\
+		__uaccess_fixup					\
+		: "+&d" (err)					\
+		: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)),	\
+		  "K" (-EFAULT), "m" (x)			\
+		: __uaccess_clobber );				\
+})
+#endif
+
+#ifndef __CHECKER__
+#define __put_user(x, ptr) \
+({								\
+	__typeof__(*(ptr)) __x = (x);				\
+	int __pu_err;						\
+	switch (sizeof (*(ptr))) {				\
+	case 1:							\
+	case 2:							\
+	case 4:							\
+	case 8:							\
+		__put_user_asm(__x, ptr, __pu_err);		\
+		break;						\
+	default:						\
+		__put_user_bad();				\
+		break;						\
+	 }							\
+	__pu_err;						\
+})
+#else
+#define __put_user(x, ptr)			\
+({						\
+	void __user *p;				\
+	p = (ptr);				\
+	0;					\
+})
+#endif
+
+#define put_user(x, ptr)					\
+({								\
+	might_sleep();						\
+	__put_user(x, ptr);					\
+})
+
+
+extern int __put_user_bad(void) __attribute__((noreturn));
+
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
+#define __get_user_asm(x, ptr, err) \
+({								\
+	err = 0;						\
+	asm volatile (						\
+		"0: mvcp  %O1(%2,%R1),0(%3),%0\n"		\
+		"1:\n"						\
+		__uaccess_fixup					\
+		: "+&d" (err), "=Q" (x)				\
+		: "d" (sizeof(*(ptr))), "a" (ptr),		\
+		  "K" (-EFAULT)					\
+		: __uaccess_clobber );				\
+})
+#else
+#define __get_user_asm(x, ptr, err) \
+({								\
+	err = 0;						\
+	asm volatile (						\
+		"0: mvcp  0(%2,%5),0(%3),%0\n"			\
+		"1:\n"						\
+		__uaccess_fixup					\
+		: "+&d" (err), "=m" (x)				\
+		: "d" (sizeof(*(ptr))), "a" (ptr),		\
+		  "K" (-EFAULT), "a" (&(x))			\
+		: __uaccess_clobber );				\
+})
+#endif
+
+#ifndef __CHECKER__
+#define __get_user(x, ptr)					\
+({								\
+	__typeof__(*(ptr)) __x;					\
+	int __gu_err;						\
+	switch (sizeof(*(ptr))) {				\
+	case 1:							\
+	case 2:							\
+	case 4:							\
+	case 8:							\
+		__get_user_asm(__x, ptr, __gu_err);		\
+		break;						\
+	default:						\
+		__get_user_bad();				\
+		break;						\
+	}							\
+	(x) = __x;						\
+	__gu_err;						\
+})
+#else
+#define __get_user(x, ptr)			\
+({						\
+	void __user *p;				\
+	p = (ptr);				\
+	0;					\
+})
+#endif
+
+
+#define get_user(x, ptr)					\
+({								\
+	might_sleep();						\
+	__get_user(x, ptr);					\
+})
+
+extern int __get_user_bad(void) __attribute__((noreturn));
+
+#define __put_user_unaligned __put_user
+#define __get_user_unaligned __get_user
+
+extern long __copy_to_user_asm(const void *from, long n, void __user *to);
+
+/**
+ * __copy_to_user: - Copy a block of data into user space, with less checking.
+ * @to:   Destination address, in user space.
+ * @from: Source address, in kernel space.
+ * @n:    Number of bytes to copy.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * Copy data from kernel space to user space.  Caller must check
+ * the specified block with access_ok() before calling this function.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+static inline unsigned long
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	return __copy_to_user_asm(from, n, to);
+}
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+/**
+ * copy_to_user: - Copy a block of data into user space.
+ * @to:   Destination address, in user space.
+ * @from: Source address, in kernel space.
+ * @n:    Number of bytes to copy.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * Copy data from kernel space to user space.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ */
+static inline unsigned long
+copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+	might_sleep();
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __copy_to_user(to, from, n);
+	return n;
+}
+
+extern long __copy_from_user_asm(void *to, long n, const void __user *from);
+
+/**
+ * __copy_from_user: - Copy a block of data from user space, with less checking.
+ * @to:   Destination address, in kernel space.
+ * @from: Source address, in user space.
+ * @n:    Number of bytes to copy.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * Copy data from user space to kernel space.  Caller must check
+ * the specified block with access_ok() before calling this function.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ *
+ * If some data could not be copied, this function will pad the copied
+ * data to the requested size using zero bytes.
+ */
+static inline unsigned long
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	return __copy_from_user_asm(to, n, from);
+}
+
+/**
+ * copy_from_user: - Copy a block of data from user space.
+ * @to:   Destination address, in kernel space.
+ * @from: Source address, in user space.
+ * @n:    Number of bytes to copy.
+ *
+ * Context: User context only.  This function may sleep.
+ *
+ * Copy data from user space to kernel space.
+ *
+ * Returns number of bytes that could not be copied.
+ * On success, this will be zero.
+ *
+ * If some data could not be copied, this function will pad the copied
+ * data to the requested size using zero bytes.
+ */
+static inline unsigned long
+copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+	might_sleep();
+	if (access_ok(VERIFY_READ, from, n))
+		n = __copy_from_user(to, from, n);
+	else
+		memset(to, 0, n);
+	return n;
+}
+
+extern unsigned long __copy_in_user_asm(const void __user *from, long n,
+							void __user *to);
+
+static inline unsigned long
+__copy_in_user(void __user *to, const void __user *from, unsigned long n)
+{
+	return __copy_in_user_asm(from, n, to);
+}
+
+static inline unsigned long
+copy_in_user(void __user *to, const void __user *from, unsigned long n)
+{
+	might_sleep();
+	if (__access_ok(from,n) && __access_ok(to,n))
+		n = __copy_in_user_asm(from, n, to);
+	return n;
+}
+
+/*
+ * Copy a null terminated string from userspace.
+ */
+extern long __strncpy_from_user_asm(long count, char *dst,
+					const char __user *src);
+
+static inline long
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res = -EFAULT;
+        might_sleep();
+        if (access_ok(VERIFY_READ, src, 1))
+                res = __strncpy_from_user_asm(count, dst, src);
+        return res;
+}
+
+
+extern long __strnlen_user_asm(long count, const char __user *src);
+
+static inline unsigned long
+strnlen_user(const char __user * src, unsigned long n)
+{
+	might_sleep();
+	return __strnlen_user_asm(n, src);
+}
+
+/**
+ * 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)
+
+/*
+ * Zero Userspace
+ */
+
+extern long __clear_user_asm(void __user *to, long n);
+
+static inline unsigned long
+__clear_user(void __user *to, unsigned long n)
+{
+	return __clear_user_asm(to, n);
+}
+
+static inline unsigned long
+clear_user(void __user *to, unsigned long n)
+{
+	might_sleep();
+	if (access_ok(VERIFY_WRITE, to, n))
+		n = __clear_user_asm(to, n);
+	return n;
+}
+
+#endif /* __S390_UACCESS_H */