patch-2.4.22 linux-2.4.22/include/asm-sh64/uaccess.h

• Lines: 289
• Date: 2003-08-25 04:44:44.000000000 -0700
• Orig file: linux-2.4.21/include/asm-sh64/uaccess.h
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/include/asm-sh64/uaccess.h linux-2.4.22/include/asm-sh64/uaccess.h
@@ -0,0 +1,288 @@
+#ifndef __ASM_SH64_UACCESS_H
+#define __ASM_SH64_UACCESS_H
+
+/*
+ * 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/asm-sh64/uaccess.h
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ *
+ * User space memory access functions
+ *
+ * Copyright (C) 1999  Niibe Yutaka
+ *
+ *  Based on:
+ *     MIPS implementation version 1.15 by
+ *              Copyright (C) 1996, 1997, 1998 by Ralf Baechle
+ *     and i386 version.
+ *
+ */
+
+#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(0xFFFFFFFF)
+#define USER_DS		MAKE_MM_SEG(0x80000000)
+
+#define get_ds()	(KERNEL_DS)
+#define get_fs()        (current->addr_limit)
+#define set_fs(x)       (current->addr_limit=(x))
+
+#define segment_eq(a,b)	((a).seg == (b).seg)
+
+#define __addr_ok(addr) ((unsigned long)(addr) < (current->addr_limit.seg))
+
+/*
+ * Uhhuh, this needs 33-bit arithmetic. We have a carry..
+ *
+ * sum := addr + size;  carry? --> flag = true;
+ * if (sum >= addr_limit) flag = true;
+ */
+#define __range_ok(addr,size) (((unsigned long) (addr) + (size) < (current->addr_limit.seg)) ? 0 : 1)
+
+#define access_ok(type,addr,size) (__range_ok(addr,size) == 0)
+#define __access_ok(addr,size) (__range_ok(addr,size) == 0)
+
+extern inline int verify_area(int type, const void * addr, unsigned long size)
+{
+	return access_ok(type,addr,size) ? 0 : -EFAULT;
+}
+
+/*
+ * 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 MIPS 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)))
+
+/*
+ * The "xxx_ret" versions return constant specified in third argument, if
+ * something bad happens. These macros can be optimized for the
+ * case of just returning from the function xxx_ret is used.
+ */
+
+#define put_user_ret(x,ptr,ret) ({ \
+if (put_user(x,ptr)) return ret; })
+
+#define get_user_ret(x,ptr,ret) ({ \
+if (get_user(x,ptr)) return ret; })
+
+#define __put_user_ret(x,ptr,ret) ({ \
+if (__put_user(x,ptr)) return ret; })
+
+#define __get_user_ret(x,ptr,ret) ({ \
+if (__get_user(x,ptr)) return ret; })
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct *)(x))
+
+#define __get_user_nocheck(x,ptr,size) ({ \
+long __gu_err; \
+__typeof(*(ptr)) __gu_val; \
+long __gu_addr; \
+__asm__("":"=r" (__gu_val)); \
+__asm__("":"=r" (__gu_err)); \
+__gu_addr = (long) (ptr); \
+switch (size) { \
+case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \
+case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \
+case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \
+case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \
+default: __get_user_unknown(); break; \
+} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_check(x,ptr,size) ({ \
+long __gu_err; \
+__typeof(*(ptr)) __gu_val; \
+long __gu_addr; \
+__asm__("":"=r" (__gu_val)); \
+__asm__("":"=r" (__gu_err)); \
+__gu_addr = (long) (ptr); \
+if (__access_ok(__gu_addr,size)) { \
+switch (size) { \
+case 1: __gu_err = __get_user_asm_b((void *) &__gu_val, __gu_addr); break; \
+case 2: __gu_err = __get_user_asm_w((void *) &__gu_val, __gu_addr); break; \
+case 4: __gu_err = __get_user_asm_l((void *) &__gu_val, __gu_addr); break; \
+case 8: __gu_err = __get_user_asm_q((void *) &__gu_val, __gu_addr); break; \
+default: __get_user_unknown(); break; \
+} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+extern long __get_user_asm_b(void *, long);
+extern long __get_user_asm_w(void *, long);
+extern long __get_user_asm_l(void *, long);
+extern long __get_user_asm_q(void *, long);
+extern void __get_user_unknown(void);
+
+#define __put_user_nocheck(x,ptr,size) ({ \
+long __pu_err; \
+__typeof__(*(ptr)) __pu_val; \
+long __pu_addr; \
+__pu_val = (x); \
+__pu_addr = (long) (ptr); \
+__asm__("":"=r" (__pu_err)); \
+switch (size) { \
+case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \
+case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \
+case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \
+case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \
+default: __put_user_unknown(); break; \
+} __pu_err; })
+
+#define __put_user_check(x,ptr,size) ({ \
+long __pu_err; \
+__typeof__(*(ptr)) __pu_val; \
+long __pu_addr; \
+__pu_val = (x); \
+__pu_addr = (long) (ptr); \
+__asm__("":"=r" (__pu_err)); \
+if (__access_ok(__pu_addr,size)) { \
+switch (size) { \
+case 1: __pu_err = __put_user_asm_b((void *) &__pu_val, __pu_addr); break; \
+case 2: __pu_err = __put_user_asm_w((void *) &__pu_val, __pu_addr); break; \
+case 4: __pu_err = __put_user_asm_l((void *) &__pu_val, __pu_addr); break; \
+case 8: __pu_err = __put_user_asm_q((void *) &__pu_val, __pu_addr); break; \
+default: __put_user_unknown(); break; \
+} } __pu_err; })
+
+extern long __put_user_asm_b(void *, long);
+extern long __put_user_asm_w(void *, long);
+extern long __put_user_asm_l(void *, long);
+extern long __put_user_asm_q(void *, long);
+extern void __put_user_unknown(void);
+
+
+/* Generic arbitrary sized copy.  */
+/* Return the number of bytes NOT copied */
+/* XXX: should be such that: 4byte and the rest. */
+extern __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_to_user_ret(to,from,n,retval) ({ \
+if (copy_to_user(to,from,n)) \
+	return retval; \
+})
+
+#define __copy_to_user(to,from,n)		\
+	__copy_user((void *)(to),		\
+		    (void *)(from), n)
+
+#define __copy_to_user_ret(to,from,n,retval) ({ \
+if (__copy_to_user(to,from,n)) \
+	return retval; \
+})
+
+#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; })
+
+#define copy_from_user_ret(to,from,n,retval) ({ \
+if (copy_from_user(to,from,n)) \
+	return retval; \
+})
+
+#define __copy_from_user(to,from,n)		\
+	__copy_user((void *)(to),		\
+		    (void *)(from), n)
+
+#define __copy_from_user_ret(to,from,n,retval) ({ \
+if (__copy_from_user(to,from,n)) \
+	return retval; \
+})
+
+/* XXX: Not sure it works well..
+   should be such that: 4byte clear and the rest. */
+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; })
+
+extern int __strncpy_from_user(unsigned long __dest, unsigned long __src, int __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; })
+
+#define strlen_user(str) strnlen_user(str, ~0UL >> 1)
+
+/*
+ * Return the size of a string (including the ending 0!)
+ */
+extern long __strnlen_user(const char *__s, long __n);
+
+extern __inline__ long strnlen_user(const char *s, long n)
+{
+	if (!__addr_ok(s))
+		return 0;
+	else
+		return __strnlen_user(s, n);
+}
+
+struct exception_table_entry
+{
+	unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup.unit otherwise.  */
+extern unsigned long search_exception_table(unsigned long addr);
+
+/* Returns the new pc */
+#define fixup_exception(map_reg, fixup_unit, pc)                \
+({                                                              \
+	fixup_unit;                                             \
+})
+
+#endif /* __ASM_SH64_UACCESS_H */