patch-2.0.21-2.1.0 linux/include/asm-i386/segment.h

• Lines: 353
• Date: Tue Sep 24 10:43:03 1996
• Orig file: lx2.0/v2.0.21/linux/include/asm-i386/segment.h
• Orig date: Tue Apr 9 10:35:29 1996

diff -u --recursive --new-file lx2.0/v2.0.21/linux/include/asm-i386/segment.h linux/include/asm-i386/segment.h
@@ -9,256 +9,15 @@
 
 #ifndef __ASSEMBLY__
 
+#include <linux/string.h>
+
 /*
  * Uh, these should become the main single-value transfer routines..
  * They automatically use the right size if we just have the right
  * pointer type..
  */
-#define put_user(x,ptr) __put_user((unsigned long)(x),(ptr),sizeof(*(ptr)))
-#define get_user(ptr) ((__typeof__(*(ptr)))__get_user((ptr),sizeof(*(ptr))))
-
-/*
- * This is a silly but good way to make sure that
- * the __put_user function is indeed always optimized,
- * and that we use the correct sizes..
- */
-extern int bad_user_access_length(void);
-
-/*
- * dummy pointer type structure.. gcc won't try to do something strange
- * this way..
- */
-struct __segment_dummy { unsigned long a[100]; };
-#define __sd(x) ((struct __segment_dummy *) (x))
-#define __const_sd(x) ((const struct __segment_dummy *) (x))
-
-static inline void __put_user(unsigned long x, void * y, int size)
-{
-	switch (size) {
-		case 1:
-			__asm__ ("movb %b1,%%fs:%0"
-				:"=m" (*__sd(y))
-				:"iq" ((unsigned char) x), "m" (*__sd(y)));
-			break;
-		case 2:
-			__asm__ ("movw %w1,%%fs:%0"
-				:"=m" (*__sd(y))
-				:"ir" ((unsigned short) x), "m" (*__sd(y)));
-			break;
-		case 4:
-			__asm__ ("movl %1,%%fs:%0"
-				:"=m" (*__sd(y))
-				:"ir" (x), "m" (*__sd(y)));
-			break;
-		default:
-			bad_user_access_length();
-	}
-}
-
-static inline unsigned long __get_user(const void * y, int size)
-{
-	unsigned long result;
-
-	switch (size) {
-		case 1:
-			__asm__ ("movb %%fs:%1,%b0"
-				:"=q" (result)
-				:"m" (*__const_sd(y)));
-			return (unsigned char) result;
-		case 2:
-			__asm__ ("movw %%fs:%1,%w0"
-				:"=r" (result)
-				:"m" (*__const_sd(y)));
-			return (unsigned short) result;
-		case 4:
-			__asm__ ("movl %%fs:%1,%0"
-				:"=r" (result)
-				:"m" (*__const_sd(y)));
-			return result;
-		default:
-			return bad_user_access_length();
-	}
-}
-
-static inline void __generic_memcpy_tofs(void * to, const void * from, unsigned long n)
-{
-    __asm__ volatile
-	("	cld
-		push %%es
-		push %%fs
-		cmpl $3,%0
-		pop %%es
-		jbe 1f
-		movl %%edi,%%ecx
-		negl %%ecx
-		andl $3,%%ecx
-		subl %%ecx,%0
-		rep; movsb
-		movl %0,%%ecx
-		shrl $2,%%ecx
-		rep; movsl
-		andl $3,%0
-	1:	movl %0,%%ecx
-		rep; movsb
-		pop %%es"
-	:"=abd" (n)
-	:"0" (n),"D" ((long) to),"S" ((long) from)
-	:"cx","di","si");
-}
-
-static inline void __constant_memcpy_tofs(void * to, const void * from, unsigned long n)
-{
-	switch (n) {
-		case 0:
-			return;
-		case 1:
-			__put_user(*(const char *) from, (char *) to, 1);
-			return;
-		case 2:
-			__put_user(*(const short *) from, (short *) to, 2);
-			return;
-		case 3:
-			__put_user(*(const short *) from, (short *) to, 2);
-			__put_user(*(2+(const char *) from), 2+(char *) to, 1);
-			return;
-		case 4:
-			__put_user(*(const int *) from, (int *) to, 4);
-			return;
-		case 8:
-			__put_user(*(const int *) from, (int *) to, 4);
-			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
-			return;
-		case 12:
-			__put_user(*(const int *) from, (int *) to, 4);
-			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
-			__put_user(*(2+(const int *) from), 2+(int *) to, 4);
-			return;
-		case 16:
-			__put_user(*(const int *) from, (int *) to, 4);
-			__put_user(*(1+(const int *) from), 1+(int *) to, 4);
-			__put_user(*(2+(const int *) from), 2+(int *) to, 4);
-			__put_user(*(3+(const int *) from), 3+(int *) to, 4);
-			return;
-	}
-#define COMMON(x) \
-__asm__("cld\n\t" \
-	"push %%es\n\t" \
-	"push %%fs\n\t" \
-	"pop %%es\n\t" \
-	"rep ; movsl\n\t" \
-	x \
-	"pop %%es" \
-	: /* no outputs */ \
-	:"c" (n/4),"D" ((long) to),"S" ((long) from) \
-	:"cx","di","si")
-
-	switch (n % 4) {
-		case 0:
-			COMMON("");
-			return;
-		case 1:
-			COMMON("movsb\n\t");
-			return;
-		case 2:
-			COMMON("movsw\n\t");
-			return;
-		case 3:
-			COMMON("movsw\n\tmovsb\n\t");
-			return;
-	}
-#undef COMMON
-}
-
-static inline void __generic_memcpy_fromfs(void * to, const void * from, unsigned long n)
-{
-    __asm__ volatile
-	("	cld
-		cmpl $3,%0
-		jbe 1f
-		movl %%edi,%%ecx
-		negl %%ecx
-		andl $3,%%ecx
-		subl %%ecx,%0
-		fs; rep; movsb
-		movl %0,%%ecx
-		shrl $2,%%ecx
-		fs; rep; movsl
-		andl $3,%0
-	1:	movl %0,%%ecx
-		fs; rep; movsb"
-	:"=abd" (n)
-	:"0" (n),"D" ((long) to),"S" ((long) from)
-	:"cx","di","si", "memory");
-}
-
-static inline void __constant_memcpy_fromfs(void * to, const void * from, unsigned long n)
-{
-	switch (n) {
-		case 0:
-			return;
-		case 1:
-			*(char *)to = __get_user((const char *) from, 1);
-			return;
-		case 2:
-			*(short *)to = __get_user((const short *) from, 2);
-			return;
-		case 3:
-			*(short *) to = __get_user((const short *) from, 2);
-			*((char *) to + 2) = __get_user(2+(const char *) from, 1);
-			return;
-		case 4:
-			*(int *) to = __get_user((const int *) from, 4);
-			return;
-		case 8:
-			*(int *) to = __get_user((const int *) from, 4);
-			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
-			return;
-		case 12:
-			*(int *) to = __get_user((const int *) from, 4);
-			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
-			*(2+(int *) to) = __get_user(2+(const int *) from, 4);
-			return;
-		case 16:
-			*(int *) to = __get_user((const int *) from, 4);
-			*(1+(int *) to) = __get_user(1+(const int *) from, 4);
-			*(2+(int *) to) = __get_user(2+(const int *) from, 4);
-			*(3+(int *) to) = __get_user(3+(const int *) from, 4);
-			return;
-	}
-#define COMMON(x) \
-__asm__("cld\n\t" \
-	"rep ; fs ; movsl\n\t" \
-	x \
-	: /* no outputs */ \
-	:"c" (n/4),"D" ((long) to),"S" ((long) from) \
-	:"cx","di","si","memory")
-
-	switch (n % 4) {
-		case 0:
-			COMMON("");
-			return;
-		case 1:
-			COMMON("fs ; movsb");
-			return;
-		case 2:
-			COMMON("fs ; movsw");
-			return;
-		case 3:
-			COMMON("fs ; movsw\n\tfs ; movsb");
-			return;
-	}
-#undef COMMON
-}
-
-#define memcpy_fromfs(to, from, n) \
-(__builtin_constant_p(n) ? \
- __constant_memcpy_fromfs((to),(from),(n)) : \
- __generic_memcpy_fromfs((to),(from),(n)))
-
-#define memcpy_tofs(to, from, n) \
-(__builtin_constant_p(n) ? \
- __constant_memcpy_tofs((to),(from),(n)) : \
- __generic_memcpy_tofs((to),(from),(n)))
+#define put_user(x,ptr)	do { (*(ptr)=(x)); } while (0)
+#define get_user(ptr)	(*(ptr))
 
 /*
  * These are deprecated..
@@ -266,72 +25,38 @@
  * Use "put_user()" and "get_user()" with the proper pointer types instead.
  */
 
-#define get_fs_byte(addr) __get_user((const unsigned char *)(addr),1)
-#define get_fs_word(addr) __get_user((const unsigned short *)(addr),2)
-#define get_fs_long(addr) __get_user((const unsigned int *)(addr),4)
-
-#define put_fs_byte(x,addr) __put_user((x),(unsigned char *)(addr),1)
-#define put_fs_word(x,addr) __put_user((x),(unsigned short *)(addr),2)
-#define put_fs_long(x,addr) __put_user((x),(unsigned int *)(addr),4)
+#define get_fs_byte(addr) get_user((const unsigned char *)(addr))
+#define get_fs_word(addr) get_user((const unsigned short *)(addr))
+#define get_fs_long(addr) get_user((const unsigned int *)(addr))
 
-#ifdef WE_REALLY_WANT_TO_USE_A_BROKEN_INTERFACE
+#define put_fs_byte(x,addr) put_user((x),(unsigned char *)(addr))
+#define put_fs_word(x,addr) put_user((x),(unsigned short *)(addr))
+#define put_fs_long(x,addr) put_user((x),(unsigned int *)(addr))
 
-static inline unsigned short get_user_word(const short *addr)
+static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
 {
-	return __get_user(addr, 2);
+	memcpy(to, from, n);
 }
 
-static inline unsigned char get_user_byte(const char * addr)
+static inline void memcpy_tofs(void * to, const void * from, unsigned long n)
 {
-	return __get_user(addr,1);
+	memcpy(to, from, n);
 }
 
-static inline unsigned long get_user_long(const int *addr)
-{
-	return __get_user(addr, 4);
-}
-
-static inline void put_user_byte(char val,char *addr)
-{
-	__put_user(val, addr, 1);
-}
-
-static inline void put_user_word(short val,short * addr)
-{
-	__put_user(val, addr, 2);
-}
-
-static inline void put_user_long(unsigned long val,int * addr)
-{
-	__put_user(val, addr, 4);
-}
-
-#endif
-
 /*
- * Someone who knows GNU asm better than I should double check the following.
- * It seems to work, but I don't know if I'm doing something subtly wrong.
- * --- TYT, 11/24/91
- * [ nothing wrong here, Linus: I just changed the ax to be any reg ]
+ * 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, these macros are grossly misnamed.
  */
-
-static inline unsigned long get_fs(void)
-{
-	unsigned long _v;
-	__asm__("mov %%fs,%w0":"=r" (_v):"0" (0));
-	return _v;
-}
+      
+#define get_fs()	(current->tss.segment)
+#define set_fs(x)	(current->tss.segment = (x))
 
 static inline unsigned long get_ds(void)
 {
-	unsigned long _v;
-	__asm__("mov %%ds,%w0":"=r" (_v):"0" (0));
-	return _v;
-}
-
-static inline void set_fs(unsigned long val)
-{
-	__asm__ __volatile__("mov %w0,%%fs": /* no output */ :"r" (val));
+	return KERNEL_DS;
 }
 
 #endif /* __ASSEMBLY__ */