sh: Split out uaccess.h in to _32 and _64 variants.

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

1 files changed, 575 insertions, 0 deletions

diff --git a/include/asm-sh/uaccess_32.h b/include/asm-sh/uaccess_32.h
new file mode 100644
index 000000000000..f18a1a5c95c0
--- /dev/null
+++ b/include/asm-sh/uaccess_32.h
@@ -0,0 +1,575 @@
+/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
+ *
+ * User space memory access functions
+ *
+ * Copyright (C) 1999, 2002  Niibe Yutaka
+ * Copyright (C) 2003  Paul Mundt
+ *
+ *  Based on:
+ *     MIPS implementation version 1.15 by
+ *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
+ *     and i386 version.
+ */
+#ifndef __ASM_SH_UACCESS_H
+#define __ASM_SH_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.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 (Data Segment Register?), these macros are misnamed.
+ */
+
+#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
+
+#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFFUL)
+#define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+#define get_ds()        (KERNEL_DS)
+
+#if !defined(CONFIG_MMU)
+/* NOMMU is always true */
+#define __addr_ok(addr) (1)
+
+static inline mm_segment_t get_fs(void)
+{
+        return USER_DS;
+}
+
+static inline void set_fs(mm_segment_t s)
+{
+}
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * If we don't have an MMU (or if its disabled) the only thing we really have
+ * to look out for is if the address resides somewhere outside of what
+ * available RAM we have.
+ *
+ * TODO: This check could probably also stand to be restricted somewhat more..
+ * though it still does the Right Thing(tm) for the time being.
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+        return ((addr >= memory_start) && ((addr + size) < memory_end));
+}
+#else /* CONFIG_MMU */
+#define __addr_ok(addr) \
+        ((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
+
+#define get_fs()        (current_thread_info()->addr_limit)
+#define set_fs(x)       (current_thread_info()->addr_limit = (x))
+
+/*
+ * __access_ok: Check if address with size is OK or not.
+ *
+ * We do three checks:
+ * (1) is it user space?
+ * (2) addr + size --> carry?
+ * (3) addr + size >= 0x80000000  (PAGE_OFFSET)
+ *
+ * (1) (2) (3) | RESULT
+ *  0   0   0  |  ok
+ *  0   0   1  |  ok
+ *  0   1   0  |  bad
+ *  0   1   1  |  bad
+ *  1   0   0  |  ok
+ *  1   0   1  |  bad
+ *  1   1   0  |  bad
+ *  1   1   1  |  bad
+ */
+static inline int __access_ok(unsigned long addr, unsigned long size)
+{
+        unsigned long flag, tmp;
+
+        __asm__("stc    r7_bank, %0\n\t"
+                "mov.l  @(8,%0), %0\n\t"
+                "clrt\n\t"
+                "addc   %2, %1\n\t"
+                "and    %1, %0\n\t"
+                "rotcl  %0\n\t"
+                "rotcl  %0\n\t"
+                "and    #3, %0"
+                : "=&z" (flag), "=r" (tmp)
+                : "r" (addr), "1" (size)
+                : "t");
+
+        return flag == 0;
+}
+#endif /* CONFIG_MMU */
+
+static inline int access_ok(int type, const void __user *p, unsigned long size)
+{
+        unsigned long addr = (unsigned long)p;
+        return __access_ok(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((__typeof__(*(ptr)))(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;                                             \
+        __chk_user_ptr(ptr);                                    \
+        switch (size) {                                         \
+        case 1:                                                 \
+                __get_user_asm(x, ptr, retval, "b");            \
+                break;                                          \
+        case 2:                                                 \
+                __get_user_asm(x, ptr, retval, "w");            \
+                break;                                          \
+        case 4:                                                 \
+                __get_user_asm(x, ptr, retval, "l");            \
+                break;                                          \
+        default:                                                \
+                __get_user_unknown();                           \
+                break;                                          \
+        }                                                       \
+} while (0)
+
+#define __get_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __gu_err, __gu_val;                                \
+        __get_user_size(__gu_val, (ptr), (size), __gu_err);     \
+        (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        __gu_err;                                               \
+})
+
+#ifdef CONFIG_MMU
+#define __get_user_check(x,ptr,size)                            \
+({                                                              \
+        long __gu_err, __gu_val;                                \
+        __chk_user_ptr(ptr);                                    \
+        switch (size) {                                         \
+        case 1:                                                 \
+                __get_user_1(__gu_val, (ptr), __gu_err);        \
+                break;                                          \
+        case 2:                                                 \
+                __get_user_2(__gu_val, (ptr), __gu_err);        \
+                break;                                          \
+        case 4:                                                 \
+                __get_user_4(__gu_val, (ptr), __gu_err);        \
+                break;                                          \
+        default:                                                \
+                __get_user_unknown();                           \
+                break;                                          \
+        }                                                       \
+                                                                \
+        (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        __gu_err;                                               \
+})
+
+#define __get_user_1(x,addr,err) ({             \
+__asm__("stc    r7_bank, %1\n\t"                \
+        "mov.l  @(8,%1), %1\n\t"                \
+        "and    %2, %1\n\t"                     \
+        "cmp/pz %1\n\t"                         \
+        "bt/s   1f\n\t"                         \
+        " mov   #0, %0\n\t"                     \
+        "0:\n"                                  \
+        "mov    #-14, %0\n\t"                   \
+        "bra    2f\n\t"                         \
+        " mov   #0, %1\n"                       \
+        "1:\n\t"                                \
+        "mov.b  @%2, %1\n\t"                    \
+        "extu.b %1, %1\n"                       \
+        "2:\n"                                  \
+        ".section       __ex_table,\"a\"\n\t"   \
+        ".long  1b, 0b\n\t"                     \
+        ".previous"                             \
+        : "=&r" (err), "=&r" (x)                \
+        : "r" (addr)                            \
+        : "t");                                 \
+})
+
+#define __get_user_2(x,addr,err) ({             \
+__asm__("stc    r7_bank, %1\n\t"                \
+        "mov.l  @(8,%1), %1\n\t"                \
+        "and    %2, %1\n\t"                     \
+        "cmp/pz %1\n\t"                         \
+        "bt/s   1f\n\t"                         \
+        " mov   #0, %0\n\t"                     \
+        "0:\n"                                  \
+        "mov    #-14, %0\n\t"                   \
+        "bra    2f\n\t"                         \
+        " mov   #0, %1\n"                       \
+        "1:\n\t"                                \
+        "mov.w  @%2, %1\n\t"                    \
+        "extu.w %1, %1\n"                       \
+        "2:\n"                                  \
+        ".section       __ex_table,\"a\"\n\t"   \
+        ".long  1b, 0b\n\t"                     \
+        ".previous"                             \
+        : "=&r" (err), "=&r" (x)                \
+        : "r" (addr)                            \
+        : "t");                                 \
+})
+
+#define __get_user_4(x,addr,err) ({             \
+__asm__("stc    r7_bank, %1\n\t"                \
+        "mov.l  @(8,%1), %1\n\t"                \
+        "and    %2, %1\n\t"                     \
+        "cmp/pz %1\n\t"                         \
+        "bt/s   1f\n\t"                         \
+        " mov   #0, %0\n\t"                     \
+        "0:\n"                                  \
+        "mov    #-14, %0\n\t"                   \
+        "bra    2f\n\t"                         \
+        " mov   #0, %1\n"                       \
+        "1:\n\t"                                \
+        "mov.l  @%2, %1\n\t"                    \
+        "2:\n"                                  \
+        ".section       __ex_table,\"a\"\n\t"   \
+        ".long  1b, 0b\n\t"                     \
+        ".previous"                             \
+        : "=&r" (err), "=&r" (x)                \
+        : "r" (addr)                            \
+        : "t");                                 \
+})
+#else /* CONFIG_MMU */
+#define __get_user_check(x,ptr,size)                                    \
+({                                                                      \
+        long __gu_err, __gu_val;                                        \
+        if (__access_ok((unsigned long)(ptr), (size))) {                \
+                __get_user_size(__gu_val, (ptr), (size), __gu_err);     \
+                (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        } else                                                          \
+                __gu_err = -EFAULT;                                     \
+        __gu_err;                                                       \
+})
+#endif
+
+#define __get_user_asm(x, addr, err, insn) \
+({ \
+__asm__ __volatile__( \
+        "1:\n\t" \
+        "mov." insn "   %2, %1\n\t" \
+        "mov    #0, %0\n" \
+        "2:\n" \
+        ".section       .fixup,\"ax\"\n" \
+        "3:\n\t" \
+        "mov    #0, %1\n\t" \
+        "mov.l  4f, %0\n\t" \
+        "jmp    @%0\n\t" \
+        " mov   %3, %0\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)); })
+
+extern void __get_user_unknown(void);
+
+#define __put_user_size(x,ptr,size,retval)              \
+do {                                                    \
+        retval = 0;                                     \
+        __chk_user_ptr(ptr);                            \
+        switch (size) {                                 \
+        case 1:                                         \
+                __put_user_asm(x, ptr, retval, "b");    \
+                break;                                  \
+        case 2:                                         \
+                __put_user_asm(x, ptr, retval, "w");    \
+                break;                                  \
+        case 4:                                         \
+                __put_user_asm(x, ptr, retval, "l");    \
+                break;                                  \
+        case 8:                                         \
+                __put_user_u64(x, ptr, retval);         \
+                break;                                  \
+        default:                                        \
+                __put_user_unknown();                   \
+        }                                               \
+} while (0)
+
+#define __put_user_nocheck(x,ptr,size)                  \
+({                                                      \
+        long __pu_err;                                  \
+        __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((unsigned long)__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" \
+        "mov    #0, %0\n" \
+        "2:\n" \
+        ".section       .fixup,\"ax\"\n" \
+        "3:\n\t" \
+        "nop\n\t" \
+        "mov.l  4f, %0\n\t" \
+        "jmp    @%0\n\t" \
+        "mov    %3, %0\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) \
+        :"memory"); })
+
+#if defined(__LITTLE_ENDIAN__)
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+        "1:\n\t" \
+        "mov.l  %R1,%2\n\t" \
+        "mov.l  %S1,%T2\n\t" \
+        "mov    #0,%0\n" \
+        "2:\n" \
+        ".section       .fixup,\"ax\"\n" \
+        "3:\n\t" \
+        "nop\n\t" \
+        "mov.l  4f,%0\n\t" \
+        "jmp    @%0\n\t" \
+        " mov   %3,%0\n" \
+        "4:     .long   2b\n\t" \
+        ".previous\n" \
+        ".section       __ex_table,\"a\"\n\t" \
+        ".long  1b, 3b\n\t" \
+        ".previous" \
+        : "=r" (retval) \
+        : "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+        : "memory"); })
+#else
+#define __put_user_u64(val,addr,retval) \
+({ \
+__asm__ __volatile__( \
+        "1:\n\t" \
+        "mov.l  %S1,%2\n\t" \
+        "mov.l  %R1,%T2\n\t" \
+        "mov    #0,%0\n" \
+        "2:\n" \
+        ".section       .fixup,\"ax\"\n" \
+        "3:\n\t" \
+        "nop\n\t" \
+        "mov.l  4f,%0\n\t" \
+        "jmp    @%0\n\t" \
+        " mov   %3,%0\n" \
+        "4:     .long   2b\n\t" \
+        ".previous\n" \
+        ".section       __ex_table,\"a\"\n\t" \
+        ".long  1b, 3b\n\t" \
+        ".previous" \
+        : "=r" (retval) \
+        : "r" (val), "m" (__m(addr)), "i" (-EFAULT) \
+        : "memory"); })
+#endif
+
+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);
+
+#define copy_to_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_to, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, (void *) (from), __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+#define copy_from_user(to,from,n) ({ \
+void *__copy_to = (void *) (to); \
+void *__copy_from = (void *) (from); \
+__kernel_size_t __copy_size = (__kernel_size_t) (n); \
+__kernel_size_t __copy_res; \
+if(__copy_size && __access_ok((unsigned long)__copy_from, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, __copy_from, __copy_size); \
+} else __copy_res = __copy_size; \
+__copy_res; })
+
+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
+__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
+{
+        __kernel_size_t res;
+        unsigned long __dummy, _d, _s;
+
+        __asm__ __volatile__(
+                "9:\n"
+                "mov.b  @%2+, %1\n\t"
+                "cmp/eq #0, %1\n\t"
+                "bt/s   2f\n"
+                "1:\n"
+                "mov.b  %1, @%3\n\t"
+                "dt     %7\n\t"
+                "bf/s   9b\n\t"
+                " add   #1, %3\n\t"
+                "2:\n\t"
+                "sub    %7, %0\n"
+                "3:\n"
+                ".section .fixup,\"ax\"\n"
+                "4:\n\t"
+                "mov.l  5f, %1\n\t"
+                "jmp    @%1\n\t"
+                " mov   %8, %0\n\t"
+                ".balign 4\n"
+                "5:     .long 3b\n"
+                ".previous\n"
+                ".section __ex_table,\"a\"\n"
+                "       .balign 4\n"
+                "       .long 9b,4b\n"
+                ".previous"
+                : "=r" (res), "=&z" (__dummy), "=r" (_s), "=r" (_d)
+                : "0" (__count), "2" (__src), "3" (__dest), "r" (__count),
+                  "i" (-EFAULT)
+                : "memory", "t");
+
+        return res;
+}
+
+#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!)
+ */
+static __inline__ long __strnlen_user(const char __user *__s, long __n)
+{
+        unsigned long res;
+        unsigned long __dummy;
+
+        __asm__ __volatile__(
+                "9:\n"
+                "cmp/eq %4, %0\n\t"
+                "bt     2f\n"
+                "1:\t"
+                "mov.b  @(%0,%3), %1\n\t"
+                "tst    %1, %1\n\t"
+                "bf/s   9b\n\t"
+                " add   #1, %0\n"
+                "2:\n"
+                ".section .fixup,\"ax\"\n"
+                "3:\n\t"
+                "mov.l  4f, %1\n\t"
+                "jmp    @%1\n\t"
+                " mov   #0, %0\n"
+                ".balign 4\n"
+                "4:     .long 2b\n"
+                ".previous\n"
+                ".section __ex_table,\"a\"\n"
+                "       .balign 4\n"
+                "       .long 1b,3b\n"
+                ".previous"
+                : "=z" (res), "=&r" (__dummy)
+                : "0" (0), "r" (__s), "r" (__n)
+                : "t");
+        return res;
+}
+
+static __inline__ long strnlen_user(const char __user *s, long n)
+{
+        if (!__addr_ok(s))
+                return 0;
+        else
+                return __strnlen_user(s, n);
+}
+
+#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_H */