X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Fasm-arm%2Fuaccess.h;h=5f420a0149f1d5dd133e17890d4a81ac2a8f0c74;hb=refs%2Fheads%2Fvserver;hp=d01310569c470385efc227fb4d3a275898856601;hpb=9213980e6a70d8473e0ffd4b39ab5b6caaba9ff5;p=linux-2.6.git

diff --git a/include/asm-arm/uaccess.h b/include/asm-arm/uaccess.h
index d01310569..5f420a014 100644
--- a/include/asm-arm/uaccess.h
+++ b/include/asm-arm/uaccess.h
@@ -40,16 +40,25 @@ struct exception_table_entry
 
 extern int fixup_exception(struct pt_regs *regs);
 
+/*
+ * These two are intentionally not defined anywhere - if the kernel
+ * code generates any references to them, that's a bug.
+ */
+extern int __get_user_bad(void);
+extern int __put_user_bad(void);
+
 /*
  * Note that this is actually 0x1,0000,0000
  */
 #define KERNEL_DS	0x00000000
-#define USER_DS		TASK_SIZE
-
 #define get_ds()	(KERNEL_DS)
+
+#ifdef CONFIG_MMU
+
+#define USER_DS		TASK_SIZE
 #define get_fs()	(current_thread_info()->addr_limit)
 
-static inline void set_fs (mm_segment_t fs)
+static inline void set_fs(mm_segment_t fs)
 {
 	current_thread_info()->addr_limit = fs;
 	modify_domain(DOMAIN_KERNEL, fs ? DOMAIN_CLIENT : DOMAIN_MANAGER);
@@ -68,19 +77,13 @@ static inline void set_fs (mm_segment_t fs)
 /* We use 33-bit arithmetic here... */
 #define __range_ok(addr,size) ({ \
 	unsigned long flag, sum; \
+	__chk_user_ptr(addr);	\
 	__asm__("adds %1, %2, %3; sbcccs %1, %1, %0; movcc %0, #0" \
 		: "=&r" (flag), "=&r" (sum) \
 		: "r" (addr), "Ir" (size), "0" (current_thread_info()->addr_limit) \
 		: "cc"); \
 	flag; })
 
-#define access_ok(type,addr,size)	(__range_ok(addr,size) == 0)
-
-static inline int verify_area(int type, const void __user *addr, unsigned long size)
-{
-	return access_ok(type, addr, size) ? 0 : -EFAULT;
-}
-
 /*
  * Single-value transfer routines.  They automatically use the right
  * size if we just have the right pointer type.  Note that the functions
@@ -91,54 +94,108 @@ static inline int verify_area(int type, const void __user *addr, unsigned long s
  * fixup code, but there are a few places where it intrudes on the
  * main code path.  When we only write to user space, there is no
  * problem.
- *
- * The "__xxx" versions of the user access functions do not verify the
- * address space - it must have been done previously with a separate
- * "access_ok()" call.
- *
- * The "xxx_error" versions set the third argument to EFAULT if an
- * error occurs, and leave it unchanged on success.  Note that these
- * versions are void (ie, don't return a value as such).
  */
-
 extern int __get_user_1(void *);
 extern int __get_user_2(void *);
 extern int __get_user_4(void *);
-extern int __get_user_8(void *);
-extern int __get_user_bad(void);
 
-#define __get_user_x(__r1,__p,__e,__s,__i...)				\
+#define __get_user_x(__r2,__p,__e,__s,__i...)				\
 	   __asm__ __volatile__ (					\
-		__asmeq("%0", "r0") __asmeq("%1", "r1")			\
+		__asmeq("%0", "r0") __asmeq("%1", "r2")			\
 		"bl	__get_user_" #__s				\
-		: "=&r" (__e), "=r" (__r1)				\
+		: "=&r" (__e), "=r" (__r2)				\
 		: "0" (__p)						\
 		: __i, "cc")
 
 #define get_user(x,p)							\
 	({								\
-		const register typeof(*(p)) *__p asm("r0") = (p);	\
-		register typeof(*(p)) __r1 asm("r1");			\
+		const register typeof(*(p)) __user *__p asm("r0") = (p);\
+		register unsigned long __r2 asm("r2");			\
 		register int __e asm("r0");				\
 		switch (sizeof(*(__p))) {				\
 		case 1:							\
-			__get_user_x(__r1, __p, __e, 1, "lr");		\
+			__get_user_x(__r2, __p, __e, 1, "lr");		\
 	       		break;						\
 		case 2:							\
-			__get_user_x(__r1, __p, __e, 2, "r2", "lr");	\
+			__get_user_x(__r2, __p, __e, 2, "r3", "lr");	\
 			break;						\
 		case 4:							\
-	       		__get_user_x(__r1, __p, __e, 4, "lr");		\
+	       		__get_user_x(__r2, __p, __e, 4, "lr");		\
 			break;						\
-		case 8:							\
-			__get_user_x(__r1, __p, __e, 8, "lr");		\
-	       		break;						\
 		default: __e = __get_user_bad(); break;			\
 		}							\
-		x = __r1;						\
+		x = (typeof(*(p))) __r2;				\
 		__e;							\
 	})
 
+extern int __put_user_1(void *, unsigned int);
+extern int __put_user_2(void *, unsigned int);
+extern int __put_user_4(void *, unsigned int);
+extern int __put_user_8(void *, unsigned long long);
+
+#define __put_user_x(__r2,__p,__e,__s)					\
+	   __asm__ __volatile__ (					\
+		__asmeq("%0", "r0") __asmeq("%2", "r2")			\
+		"bl	__put_user_" #__s				\
+		: "=&r" (__e)						\
+		: "0" (__p), "r" (__r2)					\
+		: "ip", "lr", "cc")
+
+#define put_user(x,p)							\
+	({								\
+		const register typeof(*(p)) __r2 asm("r2") = (x);	\
+		const register typeof(*(p)) __user *__p asm("r0") = (p);\
+		register int __e asm("r0");				\
+		switch (sizeof(*(__p))) {				\
+		case 1:							\
+			__put_user_x(__r2, __p, __e, 1);		\
+			break;						\
+		case 2:							\
+			__put_user_x(__r2, __p, __e, 2);		\
+			break;						\
+		case 4:							\
+			__put_user_x(__r2, __p, __e, 4);		\
+			break;						\
+		case 8:							\
+			__put_user_x(__r2, __p, __e, 8);		\
+			break;						\
+		default: __e = __put_user_bad(); break;			\
+		}							\
+		__e;							\
+	})
+
+#else /* CONFIG_MMU */
+
+/*
+ * uClinux has only one addr space, so has simplified address limits.
+ */
+#define USER_DS			KERNEL_DS
+
+#define segment_eq(a,b)		(1)
+#define __addr_ok(addr)		(1)
+#define __range_ok(addr,size)	(0)
+#define get_fs()		(KERNEL_DS)
+
+static inline void set_fs(mm_segment_t fs)
+{
+}
+
+#define get_user(x,p)	__get_user(x,p)
+#define put_user(x,p)	__put_user(x,p)
+
+#endif /* CONFIG_MMU */
+
+#define access_ok(type,addr,size)	(__range_ok(addr,size) == 0)
+
+/*
+ * The "__xxx" versions of the user access functions do not verify the
+ * address space - it must have been done previously with a separate
+ * "access_ok()" call.
+ *
+ * The "xxx_error" versions set the third argument to EFAULT if an
+ * error occurs, and leave it unchanged on success.  Note that these
+ * versions are void (ie, don't return a value as such).
+ */
 #define __get_user(x,ptr)						\
 ({									\
 	long __gu_err = 0;						\
@@ -156,6 +213,7 @@ extern int __get_user_bad(void);
 do {									\
 	unsigned long __gu_addr = (unsigned long)(ptr);			\
 	unsigned long __gu_val;						\
+	__chk_user_ptr(ptr);						\
 	switch (sizeof(*(ptr))) {					\
 	case 1:	__get_user_asm_byte(__gu_val,__gu_addr,err);	break;	\
 	case 2:	__get_user_asm_half(__gu_val,__gu_addr,err);	break;	\
@@ -219,43 +277,6 @@ do {									\
 	: "r" (addr), "i" (-EFAULT)				\
 	: "cc")
 
-extern int __put_user_1(void *, unsigned int);
-extern int __put_user_2(void *, unsigned int);
-extern int __put_user_4(void *, unsigned int);
-extern int __put_user_8(void *, unsigned long long);
-extern int __put_user_bad(void);
-
-#define __put_user_x(__r1,__p,__e,__s)					\
-	   __asm__ __volatile__ (					\
-		__asmeq("%0", "r0") __asmeq("%2", "r1")			\
-		"bl	__put_user_" #__s				\
-		: "=&r" (__e)						\
-		: "0" (__p), "r" (__r1)					\
-		: "ip", "lr", "cc")
-
-#define put_user(x,p)							\
-	({								\
-		const register typeof(*(p)) __r1 asm("r1") = (x);	\
-		const register typeof(*(p)) *__p asm("r0") = (p);	\
-		register int __e asm("r0");				\
-		switch (sizeof(*(__p))) {				\
-		case 1:							\
-			__put_user_x(__r1, __p, __e, 1);		\
-			break;						\
-		case 2:							\
-			__put_user_x(__r1, __p, __e, 2);		\
-			break;						\
-		case 4:							\
-			__put_user_x(__r1, __p, __e, 4);		\
-			break;						\
-		case 8:							\
-			__put_user_x(__r1, __p, __e, 8);		\
-			break;						\
-		default: __e = __put_user_bad(); break;			\
-		}							\
-		__e;							\
-	})
-
 #define __put_user(x,ptr)						\
 ({									\
 	long __pu_err = 0;						\
@@ -273,6 +294,7 @@ extern int __put_user_bad(void);
 do {									\
 	unsigned long __pu_addr = (unsigned long)(ptr);			\
 	__typeof__(*(ptr)) __pu_val = (x);				\
+	__chk_user_ptr(ptr);						\
 	switch (sizeof(*(ptr))) {					\
 	case 1: __put_user_asm_byte(__pu_val,__pu_addr,err);	break;	\
 	case 2: __put_user_asm_half(__pu_val,__pu_addr,err);	break;	\
@@ -359,71 +381,62 @@ do {									\
 	: "r" (x), "i" (-EFAULT)				\
 	: "cc")
 
-extern unsigned long __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
-extern unsigned long __arch_copy_to_user(void __user *to, const void *from, unsigned long n);
-extern unsigned long __arch_clear_user(void __user *addr, unsigned long n);
-extern unsigned long __arch_strncpy_from_user(char *to, const char __user *from, unsigned long count);
-extern unsigned long __arch_strnlen_user(const char __user *s, long n);
 
-static inline unsigned long copy_from_user(void *to, const void __user *from, unsigned long n)
+#ifdef CONFIG_MMU
+extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
+extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
+extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
+#else
+#define __copy_from_user(to,from,n)	(memcpy(to, (void __force *)from, n), 0)
+#define __copy_to_user(to,from,n)	(memcpy((void __force *)to, from, n), 0)
+#define __clear_user(addr,n)		(memset((void __force *)addr, 0, n), 0)
+#endif
+
+extern unsigned long __must_check __strncpy_from_user(char *to, const char __user *from, unsigned long count);
+extern unsigned long __must_check __strnlen_user(const char __user *s, long n);
+
+static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	if (access_ok(VERIFY_READ, from, n))
-		n = __arch_copy_from_user(to, from, n);
+		n = __copy_from_user(to, from, n);
 	else /* security hole - plug it */
 		memzero(to, n);
 	return n;
 }
 
-static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	return __arch_copy_from_user(to, from, n);
-}
-
-static inline unsigned long copy_to_user(void __user *to, const void *from, unsigned long n)
+static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	if (access_ok(VERIFY_WRITE, to, n))
-		n = __arch_copy_to_user(to, from, n);
+		n = __copy_to_user(to, from, n);
 	return n;
 }
 
-static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	return __arch_copy_to_user(to, from, n);
-}
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
 
-static inline unsigned long clear_user (void __user *to, unsigned long n)
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
 {
 	if (access_ok(VERIFY_WRITE, to, n))
-		n = __arch_clear_user(to, n);
+		n = __clear_user(to, n);
 	return n;
 }
 
-static inline unsigned long __clear_user (void __user *to, unsigned long n)
-{
-	return __arch_clear_user(to, n);
-}
-
-static inline long strncpy_from_user (char *dst, const char __user *src, long count)
+static inline long __must_check strncpy_from_user(char *dst, const char __user *src, long count)
 {
 	long res = -EFAULT;
 	if (access_ok(VERIFY_READ, src, 1))
-		res = __arch_strncpy_from_user(dst, src, count);
+		res = __strncpy_from_user(dst, src, count);
 	return res;
 }
 
-static inline long __strncpy_from_user (char *dst, const char __user *src, long count)
-{
-	return __arch_strncpy_from_user(dst, src, count);
-}
-
 #define strlen_user(s)	strnlen_user(s, ~0UL >> 1)
 
-static inline long strnlen_user(const char __user *s, long n)
+static inline long __must_check strnlen_user(const char __user *s, long n)
 {
 	unsigned long res = 0;
 
 	if (__addr_ok(s))
-		res = __arch_strnlen_user(s, n);
+		res = __strnlen_user(s, n);
 
 	return res;
 }