sh: Initial consolidation of the _32/_64 uaccess split.

This consolidates everything but the bare assembly routines, which we
will sync up in a follow-up patch.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 48 insertions, 229 deletions

diff --git a/include/asm-sh/uaccess_32.h b/include/asm-sh/uaccess_32.h
index 44abd168232..ae0d24f6653 100644
--- a/include/asm-sh/uaccess_32.h
+++ b/include/asm-sh/uaccess_32.h
@@ -12,56 +12,6 @@
 #ifndef __ASM_SH_UACCESS_32_H
 #define __ASM_SH_UACCESS_32_H
 
-#include <linux/errno.h>
-#include <linux/sched.h>
-#include <asm/segment.h>
-
-#define VERIFY_READ    0
-#define VERIFY_WRITE   1
-
-#define __addr_ok(addr) \
-        ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
-
-/*
- * __access_ok: Check if address with size is OK or not.
- *
- * Uhhuh, this needs 33-bit arithmetic. We have a carry..
- *
- * sum := addr + size;  carry? --> flag = true;
- * if (sum >= addr_limit) flag = true;
- */
-#define __access_ok(addr, size)         \
-        (__addr_ok((addr) + (size)))
-#define access_ok(type, addr, size)     \
-        (__chk_user_ptr(addr),          \
-         __access_ok((unsigned long __force)(addr), (size)))
-
-/*
- * Uh, these should become the main single-value transfer routines ...
- * They automatically use the right size if we just have the right
- * pointer type ...
- *
- * As SuperH uses the same address space for kernel and user data, we
- * can just do these as direct assignments.
- *
- * Careful to not
- * (a) re-use the arguments for side effects (sizeof is ok)
- * (b) require any knowledge of processes at this stage
- */
-#define put_user(x,ptr)         __put_user_check((x), (ptr), sizeof(*(ptr)))
-#define get_user(x,ptr)         __get_user_check((x), (ptr), sizeof(*(ptr)))
-
-/*
- * The "__xxx" versions do not do address space checking, useful when
- * doing multiple accesses to the same area (the user has to do the
- * checks by hand with "access_ok()")
- */
-#define __put_user(x,ptr)       __put_user_nocheck((x), (ptr), sizeof(*(ptr)))
-#define __get_user(x,ptr)       __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
-
-struct __large_struct { unsigned long buf[100]; };
-#define __m(x) (*(struct __large_struct __user *)(x))
-
 #define __get_user_size(x,ptr,size,retval)                      \
 do {                                                            \
         retval = 0;                                             \
@@ -81,28 +31,7 @@ do {								\
         }                                                       \
 } while (0)
 
-#define __get_user_nocheck(x,ptr,size)                          \
-({                                                              \
-        long __gu_err;                                          \
-        unsigned long __gu_val;                                 \
-        const __typeof__(*(ptr)) __user *__gu_addr = (ptr);     \
-        __chk_user_ptr(ptr);                                    \
-        __get_user_size(__gu_val, __gu_addr, (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)) *__gu_addr = (ptr);                    \
-        if (likely(access_ok(VERIFY_READ, __gu_addr, (size))))          \
-                __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
-        (x) = (__typeof__(*(ptr)))__gu_val;                             \
-        __gu_err;                                                       \
-})
-
+#ifdef CONFIG_MMU
 #define __get_user_asm(x, addr, err, insn) \
 ({ \
 __asm__ __volatile__( \
@@ -123,6 +52,16 @@ __asm__ __volatile__( \
         ".previous" \
         :"=&r" (err), "=&r" (x) \
         :"m" (__m(addr)), "i" (-EFAULT), "0" (err)); })
+#else
+#define __get_user_asm(x, addr, err, insn)              \
+do {                                                    \
+        __asm__ __volatile__ (                          \
+                "mov." insn "   %1, %0\n\t"             \
+                : "=&r" (x)                             \
+                : "m" (__m(addr))                       \
+        );                                              \
+} while (0)
+#endif /* CONFIG_MMU */
 
 extern void __get_user_unknown(void);
 
@@ -147,45 +86,41 @@ do {							\
         }                                               \
 } while (0)
 
-#define __put_user_nocheck(x,ptr,size)                          \
-({                                                              \
-        long __pu_err;                                          \
-        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
-        __chk_user_ptr(ptr);                                    \
-        __put_user_size((x), __pu_addr, (size), __pu_err);      \
-        __pu_err;                                               \
-})
-
-#define __put_user_check(x,ptr,size)                            \
-({                                                              \
-        long __pu_err = -EFAULT;                                \
-        __typeof__(*(ptr)) __user *__pu_addr = (ptr);           \
-        if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))   \
-                __put_user_size((x), __pu_addr, (size),         \
-                                __pu_err);                      \
-        __pu_err;                                               \
-})
-
-#define __put_user_asm(x, addr, err, insn) \
-({ \
-__asm__ __volatile__( \
-        "1:\n\t" \
-        "mov." insn "   %1, %2\n\t" \
-        "2:\n" \
-        ".section       .fixup,\"ax\"\n" \
-        "3:\n\t" \
-        "mov.l  4f, %0\n\t" \
-        "jmp    @%0\n\t" \
-        " mov   %3, %0\n\t" \
-        ".balign        4\n" \
-        "4:     .long   2b\n\t" \
-        ".previous\n" \
-        ".section       __ex_table,\"a\"\n\t" \
-        ".long  1b, 3b\n\t" \
-        ".previous" \
-        :"=&r" (err) \
-        :"r" (x), "m" (__m(addr)), "i" (-EFAULT), "0" (err)     \
-        :"memory"); })
+#ifdef CONFIG_MMU
+#define __put_user_asm(x, addr, err, insn)                      \
+do {                                                            \
+        __asm__ __volatile__ (                                  \
+                "1:\n\t"                                        \
+                "mov." insn "   %1, %2\n\t"                     \
+                "2:\n"                                          \
+                ".section       .fixup,\"ax\"\n"                \
+                "3:\n\t"                                        \
+                "mov.l  4f, %0\n\t"                             \
+                "jmp    @%0\n\t"                                \
+                " mov   %3, %0\n\t"                             \
+                ".balign        4\n"                            \
+                "4:     .long   2b\n\t"                         \
+                ".previous\n"                                   \
+                ".section       __ex_table,\"a\"\n\t"           \
+                ".long  1b, 3b\n\t"                             \
+                ".previous"                                     \
+                : "=&r" (err)                                   \
+                : "r" (x), "m" (__m(addr)), "i" (-EFAULT),      \
+                  "0" (err)                                     \
+                : "memory"                                      \
+        );                                                      \
+} while (0)
+#else
+#define __put_user_asm(x, addr, err, insn)              \
+do {                                                    \
+        __asm__ __volatile__ (                          \
+                "mov." insn "   %0, %1\n\t"             \
+                : /* no outputs */                      \
+                : "r" (x), "m" (__m(addr))              \
+                : "memory"                              \
+        );                                              \
+} while (0)
+#endif /* CONFIG_MMU */
 
 #if defined(CONFIG_CPU_LITTLE_ENDIAN)
 #define __put_user_u64(val,addr,retval) \
@@ -235,40 +170,7 @@ __asm__ __volatile__( \
 
 extern void __put_user_unknown(void);
 
-/* Generic arbitrary sized copy.  */
-/* Return the number of bytes NOT copied */
-__kernel_size_t __copy_user(void *to, const void *from, __kernel_size_t n);
-
-
-static __always_inline unsigned long
-__copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-        return __copy_user(to, (__force void *)from, n);
-}
-
-static __always_inline unsigned long __must_check
-__copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-        return __copy_user((__force void *)to, from, n);
-}
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
-
-/*
- * Clear the area and return remaining number of bytes
- * (on failure.  Usually it's 0.)
- */
-extern __kernel_size_t __clear_user(void *addr, __kernel_size_t size);
-
-#define clear_user(addr,n) ({ \
-void * __cl_addr = (addr); \
-unsigned long __cl_size = (n); \
-if (__cl_size && __access_ok(((unsigned long)(__cl_addr)), __cl_size)) \
-__cl_size = __clear_user(__cl_addr, __cl_size); \
-__cl_size; })
-
-static __inline__ int
+static inline int
 __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
 {
         __kernel_size_t res;
@@ -307,37 +209,11 @@ __strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __coun
         return res;
 }
 
-/**
- * strncpy_from_user: - Copy a NUL terminated string from userspace.
- * @dst:   Destination address, in kernel space.  This buffer must be at
- *         least @count bytes long.
- * @src:   Source address, in user space.
- * @count: Maximum number of bytes to copy, including the trailing NUL.
- *
- * Copies a NUL-terminated string from userspace to kernel space.
- *
- * On success, returns the length of the string (not including the trailing
- * NUL).
- *
- * If access to userspace fails, returns -EFAULT (some data may have been
- * copied).
- *
- * If @count is smaller than the length of the string, copies @count bytes
- * and returns @count.
- */
-#define strncpy_from_user(dest,src,count) ({ \
-unsigned long __sfu_src = (unsigned long) (src); \
-int __sfu_count = (int) (count); \
-long __sfu_res = -EFAULT; \
-if(__access_ok(__sfu_src, __sfu_count)) { \
-__sfu_res = __strncpy_from_user((unsigned long) (dest), __sfu_src, __sfu_count); \
-} __sfu_res; })
-
 /*
  * Return the size of a string (including the ending 0 even when we have
  * exceeded the maximum string length).
  */
-static __inline__ long __strnlen_user(const char __user *__s, long __n)
+static inline long __strnlen_user(const char __user *__s, long __n)
 {
         unsigned long res;
         unsigned long __dummy;
@@ -369,61 +245,4 @@ static __inline__ long __strnlen_user(const char __user *__s, long __n)
         return res;
 }
 
-/**
- * strnlen_user: - Get the size of a string in user space.
- * @s: The string to measure.
- * @n: The maximum valid length
- *
- * 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 the string is too long, returns a value greater than @n.
- */
-static __inline__ long strnlen_user(const char __user *s, long n)
-{
-        if (!__addr_ok(s))
-                return 0;
-        else
-                return __strnlen_user(s, n);
-}
-
-/**
- * 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 >> 1)
-
-/*
- * 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;
-};
-
-extern int fixup_exception(struct pt_regs *regs);
-
 #endif /* __ASM_SH_UACCESS_32_H */