patch-2.1.19 linux/include/asm-sparc64/uaccess.h

• Lines: 381
• Date: Mon Dec 30 12:00:03 1996
• Orig file: v2.1.18/linux/include/asm-sparc64/uaccess.h
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.18/linux/include/asm-sparc64/uaccess.h linux/include/asm-sparc64/uaccess.h
@@ -0,0 +1,380 @@
+/* $Id: uaccess.h,v 1.2 1996/12/26 15:36:53 davem Exp $ */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+
+#ifdef __KERNEL__
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <asm/a.out.h>
+#endif
+
+#ifndef __ASSEMBLY__
+
+/* Sparc is not segmented, however we need to be able to fool verify_area()
+ * when doing system calls from kernel mode legitimately.
+ *
+ * "For historical reasons, these macros are grossly misnamed." -Linus
+ */
+#define KERNEL_DS   0
+#define USER_DS     -1
+
+#define VERIFY_READ	0
+#define VERIFY_WRITE	1
+
+#define get_fs() (current->tss.current_ds)
+#define get_ds() (KERNEL_DS)
+#define set_fs(val) ((current->tss.current_ds) = (val))
+
+/* We have there a nice not-mapped page at page_offset - PAGE_SIZE, so that this test
+ * can be fairly lightweight.
+ * No one can read/write anything from userland in the kernel space by setting
+ * large size and address near to page_offset - a fault will break his intentions.
+ */
+#define __user_ok(addr,size) ((addr) < PAGE_OFFSET)
+#define __kernel_ok (get_fs() == KERNEL_DS)
+#define __access_ok(addr,size) (__user_ok((addr) & get_fs(),(size)))
+#define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
+
+extern inline int verify_area(int type, const void * addr, unsigned long size)
+{
+	return access_ok(type,addr,size)?0:-EFAULT;
+}
+
+/*
+ * The exception table consists of pairs of addresses: the first is the
+ * address of an instruction that is allowed to fault, and the second is
+ * the address at which the program should continue.  No registers are
+ * modified, so it is entirely up to the continuation code to figure out
+ * what to do.
+ *
+ * All the routines below use bits of fixup code that are out of line
+ * with the main instruction path.  This means when everything is well,
+ * we don't even have to jump over them.  Further, they do not intrude
+ * on our cache or tlb entries.
+ *
+ * There is a special way how to put a range of potentially faulting
+ * insns (like twenty ldd/std's with now intervening other instructions)
+ * You specify address of first in insn and 0 in fixup and in the next 
+ * exception_table_entry you specify last potentially faulting insn + 1
+ * and in fixup the routine which should handle the fault.
+ * That fixup code will get
+ * (faulting_insn_address - first_insn_in_the_range_address)/4
+ * in %g2 (ie. index of the faulting instruction in the range).
+ */
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+extern unsigned long search_exception_table(unsigned long, unsigned long *);
+
+extern void __ret_efault(void);
+
+/* Uh, these should become the main single-value transfer routines..
+ * They automatically use the right size if we just have the right
+ * pointer type..
+ *
+ * This gets kind of ugly. We want to return _two_ values in "get_user()"
+ * and yet we don't want to do any pointers, because that is too much
+ * of a performance impact. Thus we have a few rather ugly macros here,
+ * and hide all the uglyness from the user.
+ */
+#define put_user(x,ptr) ({ \
+unsigned long __pu_addr = (unsigned long)(ptr); \
+__put_user_check((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr))); })
+
+#define put_user_ret(x,ptr,retval) ({ \
+unsigned long __pu_addr = (unsigned long)(ptr); \
+__put_user_check_ret((__typeof__(*(ptr)))(x),__pu_addr,sizeof(*(ptr)),retval); })
+
+#define get_user(x,ptr) ({ \
+unsigned long __gu_addr = (unsigned long)(ptr); \
+__get_user_check((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr))); })
+
+#define get_user_ret(x,ptr,retval) ({ \
+unsigned long __gu_addr = (unsigned long)(ptr); \
+__get_user_check_ret((x),__gu_addr,sizeof(*(ptr)),__typeof__(*(ptr)),retval); })
+
+/*
+ * 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 __put_user_ret(x,ptr,retval) __put_user_nocheck_ret((x),(ptr),sizeof(*(ptr)),retval)
+#define __get_user(x,ptr) __get_user_nocheck((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr)))
+#define __get_user_ret(x,ptr,retval) __get_user_nocheck_ret((x),(ptr),sizeof(*(ptr)),__typeof__(*(ptr)),retval)
+
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) ((struct __large_struct *)(x))
+
+#define __put_user_check(x,addr,size) ({ \
+register int __pu_ret; \
+if (__access_ok(addr,size)) { \
+switch (size) { \
+case 1: __put_user_asm(x,b,addr,__pu_ret); break; \
+case 2: __put_user_asm(x,h,addr,__pu_ret); break; \
+case 4: __put_user_asm(x,w,addr,__pu_ret); break; \
+case 8: __put_user_asm(x,x,addr,__pu_ret); break; \
+default: __pu_ret = __put_user_bad(); break; \
+} } else { __pu_ret = -EFAULT; } __pu_ret; })
+
+#define __put_user_check_ret(x,addr,size,retval) ({ \
+register int __foo __asm__ ("l1"); \
+if (__access_ok(addr,size)) { \
+switch (size) { \
+case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \
+case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \
+case 4: __put_user_asm_ret(x,w,addr,retval,__foo); break; \
+case 8: __put_user_asm_ret(x,x,addr,retval,__foo); break; \
+default: if (__put_user_bad()) return retval; break; \
+} } else return retval; })
+
+#define __put_user_nocheck(x,addr,size) ({ \
+register int __pu_ret; \
+switch (size) { \
+case 1: __put_user_asm(x,b,addr,__pu_ret); break; \
+case 2: __put_user_asm(x,h,addr,__pu_ret); break; \
+case 4: __put_user_asm(x,w,addr,__pu_ret); break; \
+case 8: __put_user_asm(x,x,addr,__pu_ret); break; \
+default: __pu_ret = __put_user_bad(); break; \
+} __pu_ret; })
+
+#define __put_user_nocheck_ret(x,addr,size,retval) ({ \
+register int __foo __asm__ ("l1"); \
+switch (size) { \
+case 1: __put_user_asm_ret(x,b,addr,retval,__foo); break; \
+case 2: __put_user_asm_ret(x,h,addr,retval,__foo); break; \
+case 4: __put_user_asm_ret(x,w,addr,retval,__foo); break; \
+case 8: __put_user_asm_ret(x,x,addr,retval,__foo); break; \
+default: if (__put_user_bad()) return retval; break; \
+} })
+
+#define __put_user_asm(x,size,addr,ret)					\
+__asm__ __volatile__(							\
+	"/* Put user asm, inline. */\n"					\
+"1:\t"	"st"#size " %1, [%2]\n\t"					\
+	"clr	%0\n"							\
+"2:\n\n\t"								\
+	".section .fixup,#alloc,#execinstr\n\t"				\
+	".align	4\n"							\
+"3:\n\t"								\
+	"b	2b\n\t"							\
+	" mov	%3, %0\n\n\t"						\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b, 3b\n\t"						\
+	".text\n\n\t"							\
+       : "=&r" (ret) : "r" (x), "r" (__m(addr)),			\
+	 "i" (-EFAULT))
+
+#define __put_user_asm_ret(x,size,addr,ret,foo)				\
+if (__builtin_constant_p(ret) && ret == -EFAULT)			\
+__asm__ __volatile__(							\
+	"/* Put user asm ret, inline. */\n"				\
+"1:\t"	"st"#size " %1, [%2]\n\n\t"					\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b, __ret_efault\n\n\t"					\
+	".text\n\n\t"							\
+       : "=r" (foo) : "r" (x), "r" (__m(addr)));			\
+else									\
+__asm__ __volatile(							\
+	"/* Put user asm ret, inline. */\n"				\
+"1:\t"	"st"#size " %1, [%2]\n\n\t"					\
+	".section .fixup,#alloc,#execinstr\n\t"				\
+	".align	4\n"							\
+"3:\n\t"								\
+	"ret\n\t"							\
+	" restore %%g0, %3, %%o0\n\n\t"					\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b, 3b\n\n\t"						\
+	".text\n\n\t"							\
+       : "=r" (foo) : "r" (x), "r" (__m(addr)), "i" (ret))
+
+extern int __put_user_bad(void);
+
+#define __get_user_check(x,addr,size,type) ({ \
+register int __gu_ret; \
+register unsigned long __gu_val; \
+if (__access_ok(addr,size)) { \
+switch (size) { \
+case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
+case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
+case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
+case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
+default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
+} } else { __gu_val = 0; __gu_ret = -EFAULT; } x = (type) __gu_val; __gu_ret; })
+
+#define __get_user_check_ret(x,addr,size,type,retval) ({ \
+register unsigned long __gu_val __asm__ ("l1"); \
+if (__access_ok(addr,size)) { \
+switch (size) { \
+case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
+case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
+case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
+case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
+default: if (__get_user_bad()) return retval; \
+} x = (type) __gu_val; } else return retval; })
+
+#define __get_user_nocheck(x,addr,size,type) ({ \
+register int __gu_ret; \
+register unsigned long __gu_val; \
+switch (size) { \
+case 1: __get_user_asm(__gu_val,ub,addr,__gu_ret); break; \
+case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
+case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
+case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
+default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
+} x = (type) __gu_val; __gu_ret; })
+
+#define __get_user_nocheck_ret(x,addr,size,type,retval) ({ \
+register unsigned long __gu_val __asm__ ("l1"); \
+switch (size) { \
+case 1: __get_user_asm_ret(__gu_val,ub,addr,retval); break; \
+case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
+case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
+case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
+default: if (__get_user_bad()) return retval; \
+} x = (type) __gu_val; })
+
+#define __get_user_asm(x,size,addr,ret)					\
+__asm__ __volatile__(							\
+	"/* Get user asm, inline. */\n"					\
+"1:\t"	"ld"#size " [%2], %1\n\t"					\
+	"clr	%0\n"							\
+"2:\n\n\t"								\
+	".section .fixup,#alloc,#execinstr\n\t"				\
+	".align	4\n"							\
+"3:\n\t"								\
+	"clr	%1\n\t"							\
+	"b	2b\n\t"							\
+	" mov	%3, %0\n\n\t"						\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b, 3b\n\n\t"						\
+	".text\n\t"							\
+       : "=&r" (ret), "=&r" (x) : "r" (__m(addr)),			\
+	 "i" (-EFAULT))
+
+#define __get_user_asm_ret(x,size,addr,retval)				\
+if (__builtin_constant_p(retval) && retval == -EFAULT)			\
+__asm__ __volatile__(							\
+	"/* Get user asm ret, inline. */\n"				\
+"1:\t"	"ld"#size " [%1], %0\n\n\t"					\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b,__ret_efault\n\n\t"					\
+	".text\n\t"							\
+       : "=&r" (x) : "r" (__m(addr)));					\
+else									\
+__asm__ __volatile__(							\
+	"/* Get user asm ret, inline. */\n"				\
+"1:\t"	"ld"#size " [%1], %0\n\n\t"					\
+	".section .fixup,#alloc,#execinstr\n\t"				\
+	".align	4\n"							\
+"3:\n\t"								\
+	"ret\n\t"							\
+	" restore %%g0, %2, %%o0\n\n\t"					\
+	".section __ex_table,#alloc\n\t"				\
+	".align	4\n\t"							\
+	".word	1b, 3b\n\n\t"						\
+	".text\n\t"							\
+       : "=&r" (x) : "r" (__m(addr)), "i" (retval))
+
+extern int __get_user_bad(void);
+
+extern int __copy_user(unsigned long to, unsigned long from, int size);
+
+#define copy_to_user(to,from,n) ({ \
+unsigned long __copy_to = (unsigned long) (to); \
+unsigned long __copy_size = (unsigned long) (n); \
+unsigned long __copy_res; \
+if(__copy_size && __access_ok(__copy_to, __copy_size)) { \
+__copy_res = __copy_user(__copy_to, (unsigned long) (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((unsigned long)(to),	\
+		    (unsigned long)(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) ({ \
+unsigned long __copy_from = (unsigned long) (from); \
+unsigned long __copy_size = (unsigned long) (n); \
+unsigned long __copy_res; \
+if(__copy_size && __access_ok(__copy_from, __copy_size)) { \
+__copy_res = __copy_user((unsigned long) (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((unsigned long)(to),	\
+		    (unsigned long)(from), n)
+
+#define __copy_from_user_ret(to,from,n,retval) ({ \
+if (__copy_from_user(to,from,n)) \
+	return retval; \
+})
+
+extern int __clear_user(unsigned long addr, int size);
+
+#define clear_user(addr,n) ({ \
+unsigned long __clear_addr = (unsigned long) (addr); \
+int __clear_size = (int) (n); \
+int __clear_res; \
+if(__clear_size && __access_ok(__clear_addr, __clear_size)) { \
+__clear_res = __clear_user(__clear_addr, __clear_size); \
+} else __clear_res = __clear_size; \
+__clear_res; })
+
+#define clear_user_ret(addr,size,retval) ({ \
+if (clear_user(addr,size)) \
+	return retval; \
+})
+
+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; })
+
+extern int __strlen_user(const char *);
+
+extern __inline__ int strlen_user(const char *str)
+{
+	if(!access_ok(VERIFY_READ, str, 0))
+		return 0;
+	else
+		return __strlen_user(str);
+}
+
+#endif  /* __ASSEMBLY__ */
+
+#endif /* _ASM_UACCESS_H */