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Message-Id: <875ba2708f6cd3c585e4d965142e2feb07c39a0e.1215517976.git.monstr@monstr.eu>
Date: Tue, 8 Jul 2008 13:59:20 +0200
From: monstr@...str.eu
To: linux-kernel@...r.kernel.org
Cc: monstr@...nam.cz, arnd@...db.de, linux-arch@...r.kernel.org,
stephen.neuendorffer@...inx.com, John.Linn@...inx.com,
john.williams@...alogix.com, matthew@....cx, will.newton@...il.com,
drepper@...hat.com, microblaze-uclinux@...e.uq.edu.au,
grant.likely@...retlab.ca, vapier.adi@...il.com,
alan@...rguk.ukuu.org.uk, hpa@...or.com, lethal@...ux-sh.org,
florian@...nwrt.org, Michal Simek <monstr@...str.eu>
Subject: [PATCH 20/58] microblaze_v5: uaccess files
From: Michal Simek <monstr@...str.eu>
Acked-by: Stephen Neuendorffer <stephen.neuendorffer@...inx.com>
Signed-off-by: Michal Simek <monstr@...str.eu>
---
arch/microblaze/lib/uaccess.c | 41 +++++++++++++
include/asm-microblaze/uaccess.h | 120 ++++++++++++++++++++++++++++++++++++++
2 files changed, 161 insertions(+), 0 deletions(-)
create mode 100644 arch/microblaze/lib/uaccess.c
create mode 100644 include/asm-microblaze/uaccess.h
diff --git a/arch/microblaze/lib/uaccess.c b/arch/microblaze/lib/uaccess.c
new file mode 100644
index 0000000..03a3051
--- /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 *s, long n)
+{
+ return strlen(s) + 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 *src, long count)
+{
+ long res = -EFAULT;
+ if (access_ok(VERIFY_READ, src, 1))
+ __do_strncpy_from_user(dst, src, count, res);
+ return res;
+}
diff --git a/include/asm-microblaze/uaccess.h b/include/asm-microblaze/uaccess.h
new file mode 100644
index 0000000..670fe06
--- /dev/null
+++ b/include/asm-microblaze/uaccess.h
@@ -0,0 +1,120 @@
+/*
+ * 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
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/sched.h> /* RLIMIT_FSIZE */
+
+#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;
+}
+
+#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)
+
+/*
+ * 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;
+};
+
+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 *src, long count);
+extern long strnlen_user(const char *src, long count);
+extern long __strncpy_from_user(char *dst, const char *src, long count);
+
+#endif /* _ASM_MICROBLAZE_UACCESS_H */
--
1.5.4.GIT
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