-/* $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>
+#include <asm/segment.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))
+ ((unsigned long __force)(addr) < current_thread_info()->addr_limit.seg)
/*
* __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)
+ * Uhhuh, this needs 33-bit arithmetic. We have a carry..
*
- * (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
+ * sum := addr + size; carry? --> flag = true;
+ * if (sum >= addr_limit) flag = true;
*/
-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);
-}
+#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 ...
* (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)))
+#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)))
+#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; \
- __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; \
+ long __gu_err; \
+ unsigned long __gu_val; \
+ const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
__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; \
- } \
- \
+ __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
(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; \
+ 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; \
})
-#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_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 (__access_ok((unsigned long)__pu_addr,size)) \
- __put_user_size((x),__pu_addr,(size),__pu_err); \
+ 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" \
- "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"); })
+#ifdef CONFIG_SUPERH32
+# include "uaccess_32.h"
#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"); })
+# include "uaccess_64.h"
#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)
{
* 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);
+__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; })
+#define clear_user(addr,n) \
+({ \
+ void __user * __cl_addr = (addr); \
+ unsigned long __cl_size = (n); \
+ \
+ if (__cl_size && access_ok(VERIFY_WRITE, \
+ ((unsigned long)(__cl_addr)), __cl_size)) \
+ __cl_size = __clear_user(__cl_addr, __cl_size); \
+ \
+ __cl_size; \
+})
+
+/**
+ * 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; \
+})
-static __inline__ int
-__strncpy_from_user(unsigned long __dest, unsigned long __user __src, int __count)
+static inline unsigned long
+copy_from_user(void *to, const void __user *from, unsigned long n)
{
- __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;
-}
+ unsigned long __copy_from = (unsigned long) from;
+ __kernel_size_t __copy_size = (__kernel_size_t) n;
-#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; })
+ if (__copy_size && __access_ok(__copy_from, __copy_size))
+ return __copy_user(to, from, __copy_size);
-/*
- * Return the size of a string (including the ending 0!)
- */
-static __inline__ long __strnlen_user(const char __user *__s, long __n)
+ return __copy_size;
+}
+
+static inline unsigned long
+copy_to_user(void __user *to, const void *from, unsigned 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;
+ unsigned long __copy_to = (unsigned long) to;
+ __kernel_size_t __copy_size = (__kernel_size_t) n;
+
+ if (__copy_size && __access_ok(__copy_to, __copy_size))
+ return __copy_user(to, from, __copy_size);
+
+ return __copy_size;
}
-static __inline__ long strnlen_user(const char __user *s, long n)
+/**
+ * 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;
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)
/*
* we don't even have to jump over them. Further, they do not intrude
* on our cache or tlb entries.
*/
-
-struct exception_table_entry
-{
+struct exception_table_entry {
unsigned long insn, fixup;
};
-extern int fixup_exception(struct pt_regs *regs);
+#if defined(CONFIG_SUPERH64) && defined(CONFIG_MMU)
+#define ARCH_HAS_SEARCH_EXTABLE
+#endif
+
+int fixup_exception(struct pt_regs *regs);
+/* Returns 0 if exception not found and fixup.unit otherwise. */
+unsigned long search_exception_table(unsigned long addr);
+const struct exception_table_entry *search_exception_tables(unsigned long addr);
+
#endif /* __ASM_SH_UACCESS_H */
projects / linux-2.6-omap-h63xx.git / blobdiff