microblaze_v8: uaccess files

Reviewed-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com>
Acked-by: John Linn <john.linn@xilinx.com>
Acked-by: John Williams <john.williams@petalogix.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>

2 files changed, 175 insertions, 0 deletions

diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
new file mode 100644
index 000000000000..5a3ffc308e12
--- /dev/null
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#ifndef _ASM_MICROBLAZE_UACCESS_H
+#define _ASM_MICROBLAZE_UACCESS_H
+
+#ifdef __KERNEL__
+#ifndef __ASSEMBLY__
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/sched.h> /* RLIMIT_FSIZE */
+#include <linux/mm.h>
+
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/segment.h>
+#include <linux/string.h>
+
+#define VERIFY_READ     0
+#define VERIFY_WRITE    1
+
+extern int ___range_ok(unsigned long addr, unsigned long size);
+
+#define __range_ok(addr, size) \
+                ___range_ok((unsigned long)(addr), (unsigned long)(size))
+
+#define access_ok(type, addr, size) (__range_ok((addr), (size)) == 0)
+#define __access_ok(add, size) (__range_ok((addr), (size)) == 0)
+
+extern inline int bad_user_access_length(void)
+{
+        return 0;
+}
+/* FIXME this is function for optimalization -> memcpy */
+#define __get_user(var, ptr)                                    \
+        ({                                                      \
+                int __gu_err = 0;                               \
+                switch (sizeof(*(ptr))) {                       \
+                case 1:                                         \
+                case 2:                                         \
+                case 4:                                         \
+                        (var) = *(ptr);                         \
+                        break;                                  \
+                case 8:                                         \
+                        memcpy((void *) &(var), (ptr), 8);      \
+                        break;                                  \
+                default:                                        \
+                        (var) = 0;                              \
+                        __gu_err = __get_user_bad();            \
+                        break;                                  \
+                }                                               \
+                __gu_err;                                       \
+        })
+
+#define __get_user_bad()        (bad_user_access_length(), (-EFAULT))
+
+#define __put_user(var, ptr)                                    \
+        ({                                                      \
+                int __pu_err = 0;                               \
+                switch (sizeof(*(ptr))) {                       \
+                case 1:                                         \
+                case 2:                                         \
+                case 4:                                         \
+                        *(ptr) = (var);                         \
+                        break;                                  \
+                case 8: {                                       \
+                        typeof(*(ptr)) __pu_val = var;          \
+                        memcpy(ptr, &__pu_val, sizeof(__pu_val));\
+                        }                                       \
+                        break;                                  \
+                default:                                        \
+                        __pu_err = __put_user_bad();            \
+                        break;                                  \
+                }                                                       \
+                __pu_err;                                               \
+        })
+
+#define __put_user_bad()        (bad_user_access_length(), (-EFAULT))
+
+#define put_user(x, ptr)        __put_user(x, ptr)
+#define get_user(x, ptr)        __get_user(x, ptr)
+
+#define copy_to_user(to, from, n)               (memcpy(to, from, n), 0)
+#define copy_from_user(to, from, n)             (memcpy(to, from, n), 0)
+
+#define __copy_to_user(to, from, n)             (copy_to_user(to, from, n))
+#define __copy_from_user(to, from, n)           (copy_from_user(to, from, n))
+#define __copy_to_user_inatomic(to, from, n)    (__copy_to_user(to, from, n))
+#define __copy_from_user_inatomic(to, from, n)  (__copy_from_user(to, from, n))
+
+#define __clear_user(addr, n)   (memset((void *)addr, 0, n), 0)
+
+static inline unsigned long clear_user(void *addr, unsigned long size)
+{
+        if (access_ok(VERIFY_WRITE, addr, size))
+                size = __clear_user(addr, size);
+        return size;
+}
+
+/* Returns 0 if exception not found and fixup otherwise. */
+extern unsigned long search_exception_table(unsigned long);
+
+
+extern long strncpy_from_user(char *dst, const char __user *src, long count);
+extern long strnlen_user(const char __user *src, long count);
+extern long __strncpy_from_user(char *dst, const char __user *src, long count);
+
+/*
+ * 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;
+};
+
+#endif  /* __ASSEMBLY__ */
+#endif /* __KERNEL__ */
+
+#endif /* _ASM_MICROBLAZE_UACCESS_H */
diff --git a/arch/microblaze/lib/uaccess.c b/arch/microblaze/lib/uaccess.c
new file mode 100644
index 000000000000..8eb9df5a26c9
--- /dev/null
+++ b/arch/microblaze/lib/uaccess.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/string.h>
+#include <asm/uaccess.h>
+
+#include <asm/bug.h>
+
+long strnlen_user(const char __user *src, long count)
+{
+        return strlen(src) + 1;
+}
+
+#define __do_strncpy_from_user(dst, src, count, res)                    \
+        do {                                                            \
+                char *tmp;                                              \
+                strncpy(dst, src, count);                               \
+                for (tmp = dst; *tmp && count > 0; tmp++, count--)      \
+                        ;                                               \
+                res = (tmp - dst);                                      \
+        } while (0)
+
+long __strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res;
+        __do_strncpy_from_user(dst, src, count, res);
+        return res;
+}
+
+long strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        long res = -EFAULT;
+        if (access_ok(VERIFY_READ, src, 1))
+                __do_strncpy_from_user(dst, src, count, res);
+        return res;
+}