patch-2.3.16 linux/include/asm-sh/uaccess.h

• Lines: 440
• Date: Mon Aug 30 18:12:59 1999
• Orig file: v2.3.15/linux/include/asm-sh/uaccess.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.15/linux/include/asm-sh/uaccess.h linux/include/asm-sh/uaccess.h
@@ -0,0 +1,439 @@
+/*
+ * 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.
+ */
+#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(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 flag,sum; \
+	__asm__("clrt; addc %3,%1; movt %0; cmp/hi %4,%1; rotcl %0" \
+		:"=&r" (flag), "=r" (sum) \
+		:"1" (addr), "r" (size), "r" (current->addr_limit.seg)); \
+	flag; })
+
+#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)); \
+__gu_addr = (long) (ptr); \
+__asm__("":"=r" (__gu_err)); \
+switch (size) { \
+case 1: __get_user_asm("b"); break; \
+case 2: __get_user_asm("w"); break; \
+case 4: __get_user_asm("l"); 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)); \
+__gu_addr = (long) (ptr); \
+__asm__("":"=r" (__gu_err)); \
+if (__access_ok(__gu_addr,size)) { \
+switch (size) { \
+case 1: __get_user_asm("b"); break; \
+case 2: __get_user_asm("w"); break; \
+case 4: __get_user_asm("l"); break; \
+default: __get_user_unknown(); break; \
+} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov." insn "	%2,%1\n\t" \
+	"mov	#0,%0\n" \
+	"2:\n\t" \
+	".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\t" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	:"=&r" (__gu_err), "=&r" (__gu_val) \
+	:"m" (__m(__gu_addr)), "i" (-EFAULT)); })
+
+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: __put_user_asm("b"); break; \
+case 2: __put_user_asm("w"); break; \
+case 4: __put_user_asm("l"); 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: __put_user_asm("b"); break; \
+case 2: __put_user_asm("w"); break; \
+case 4: __put_user_asm("l"); break; \
+default: __put_user_unknown(); break; \
+} } __pu_err; })
+
+#define __put_user_asm(insn) \
+({ \
+__asm__ __volatile__( \
+	"1:\n\t" \
+	"mov." insn "	%1,%2\n\t" \
+	"mov	#0,%0\n" \
+	"2:\n\t" \
+	".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\t" \
+	".section	__ex_table,\"a\"\n\t" \
+	".long	1b, 3b\n\t" \
+	".previous" \
+	:"=&r" (__pu_err) \
+	:"r" (__pu_val), "m" (__m(__pu_addr)), "i" (-EFAULT)); })
+
+extern void __put_user_unknown(void);
+
+/* Generic arbitrary sized copy.  */
+/* XXX: should be such that: 4byte and the rest. */
+extern __inline__ __kernel_size_t
+__copy_user(void *__to, const void *__from, __kernel_size_t __n)
+{
+	unsigned long __dummy, _f, _t;
+	__kernel_size_t res;
+
+	__asm__ __volatile__(
+		"9:\n\t"
+		"mov.b	@%2+,%1\n\t"
+		"dt	%0\n"
+		"1:\n\t"
+		"mov.b	%1,@%3\n\t"
+		"bf/s	9b\n\t"
+		" add	#1,%3\n"
+		"2:"
+		".section .fixup,\"ax\"\n"
+		"3:\n\t"
+		"mov.l	5f,%1\n\t"
+		"jmp	@%1\n\t"
+		" mov	%7,%0\n\t"
+		".align 4\n"
+		"5:	.long 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.align 4\n"
+		"	.long 9b,3b\n"
+		"	.long 1b,2b\n"
+		".previous"
+		: "=&r" (res), "=&z" (__dummy), "=&r" (_f), "=&r" (_t)
+		: "2" (__from), "3" (__to), "0" (__n), "i" (-EFAULT)
+		: "memory");
+
+	return res;
+}
+
+#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 __inline__ __kernel_size_t
+__clear_user(void *addr, __kernel_size_t size)
+{
+	__kernel_size_t res;
+	unsigned long __a, __s;
+
+	__asm__ __volatile__(
+		"9:\n\t"
+		"dt	%2\n"
+		"1:\n\t"
+		"mov.b	%5,@%1\n\t"
+		"bf/s	9b\n\t"
+		" add	#1,%1\n\t"
+		"sub	%2,%0\n"
+		"2:\n"
+		".section .fixup,\"ax\"\n"
+		"3:\n\t"
+		"mov.l	4f,%0\n\t"
+		"jmp	@%0\n\t"
+		" mov	%7,%0\n"
+		".align 4\n"
+		"4:	.long 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.align 4\n"
+		"	.long 1b,3b\n"
+		".previous"
+		: "=&r" (res), "=&r" (__a), "=&r" (__s)
+		: "1" (addr), "2" (size), "r" (0), "0" (size), "i" (-EFAULT));
+
+	return res;
+}
+
+#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 __inline__ int
+__strncpy_from_user(unsigned long __dest, unsigned long __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	%0\n\t"
+		"bf/s	9b\n\t"
+		" add	#1,%3\n\t"
+		"sub	%6,%0\n"
+		"2:\n"
+		".section .fixup,\"ax\"\n"
+		"3:\n\t"
+		"mov.l	4f,%1\n\t"
+		"jmp	@%1\n\t"
+		" mov	%8,%0\n\t"
+		".align 4\n"
+		"4:	.long 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.align 4\n"
+		"	.long 9b,3b\n"
+		"	.long 1b,2b\n"
+		".previous"
+		: "=&r" (res), "=&z" (__dummy), "=&r" (_s), "=&r" (_d)
+		: "2" (__src), "3" (__dest), "r" (__count), "0" (__count),
+		  "i" (-EFAULT)
+		: "memory");
+
+	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!)
+ */
+extern __inline__ long __strlen_user(const char *__s)
+{
+	unsigned long res;
+	unsigned long __dummy;
+
+	__asm__ __volatile__(
+		"mov	#-1,%1\n"
+		"9:\n"
+		"cmp/eq	#0,%1\n\t"
+		"bf/s	9b\n\t"
+		"1:\t"
+		" mov.b	@%0+,%1\n\t"
+		"sub	%3,%0\n"
+		"2:\n"
+		".section .fixup,\"ax\"\n"
+		"3:\n\t"
+		"mov.l	4f,%1\n\t"
+		"jmp	@%1\n\t"
+		" mov	%4,%0\n"
+		".align 4\n"
+		"4:	.long 2b\n"
+		".previous\n"
+		".section __ex_table,\"a\"\n"
+		"	.align 4\n"
+		"	.long 1b,3b\n"
+		".previous"
+		: "=&r" (res), "=&z" (__dummy)
+		: "0" (__s), "r" (__s), "i" (-EFAULT));
+	return res;
+}
+
+extern __inline__ long strlen_user(const char *s)
+{
+	if(!access_ok(VERIFY_READ, s, 0))
+		return 0;
+	else
+		return __strlen_user(s);
+}
+
+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_SH_UACCESS_H */