patch-2.3.48 linux/include/asm-mips64/uaccess.h
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- Lines: 472
- Date:
Thu Feb 24 22:53:35 2000
- Orig file:
v2.3.47/linux/include/asm-mips64/uaccess.h
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.47/linux/include/asm-mips64/uaccess.h linux/include/asm-mips64/uaccess.h
@@ -0,0 +1,471 @@
+/* $Id: uaccess.h,v 1.5 2000/02/21 18:05:07 ralf Exp $
+ *
+ * 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.
+ *
+ * Copyright (C) 1996, 1997, 1998, 1999 by Ralf Baechle
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+#ifndef _ASM_UACCESS_H
+#define _ASM_UACCESS_H
+
+#include <linux/errno.h>
+#include <linux/sched.h>
+
+#define STR(x) __STR(x)
+#define __STR(x) #x
+
+/*
+ * 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.
+ */
+#define KERNEL_DS ((mm_segment_t) { (unsigned long) 0L })
+#define USER_DS ((mm_segment_t) { (unsigned long) -1L })
+
+#define VERIFY_READ 0
+#define VERIFY_WRITE 1
+
+#define get_fs() (current->thread.current_ds)
+#define get_ds() (KERNEL_DS)
+#define set_fs(x) (current->thread.current_ds=(x))
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+
+/*
+ * Is a address valid? This does a straighforward calculation rather
+ * than tests.
+ *
+ * Address valid if:
+ * - "addr" doesn't have any high-bits set
+ * - AND "size" doesn't have any high-bits set
+ * - AND "addr+size" doesn't have any high-bits set
+ * - OR we are in kernel mode.
+ */
+#define __access_ok(addr,size,mask) \
+ (((__signed__ long)((mask)&(addr | size | (addr+size)))) >= 0)
+#define __access_mask ((long)(get_fs().seg))
+
+#define access_ok(type,addr,size) \
+__access_ok(((unsigned long)(addr)),(size),__access_mask)
+
+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)),__access_mask)
+#define get_user(x,ptr) __get_user_check((x),(ptr),sizeof(*(ptr)),__access_mask)
+
+/*
+ * 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("lb"); break; \
+case 2: __get_user_asm("lh"); break; \
+case 4: __get_user_asm("lw"); break; \
+case 8: __get_user_asm("ld"); break; \
+default: __get_user_unknown(); break; \
+} x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_check(x,ptr,size,mask) ({ \
+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,mask)) { \
+switch (size) { \
+case 1: __get_user_asm("lb"); break; \
+case 2: __get_user_asm("lh"); break; \
+case 4: __get_user_asm("lw"); break; \
+case 8: __get_user_asm("ld"); break; \
+default: __get_user_unknown(); break; \
+} } x = (__typeof__(*(ptr))) __gu_val; __gu_err; })
+
+#define __get_user_asm(insn) \
+({ \
+__asm__ __volatile__( \
+ "1:\t" insn "\t%1,%2\n\t" \
+ "move\t%0,$0\n" \
+ "2:\n\t" \
+ ".section\t.fixup,\"ax\"\n" \
+ "3:\tli\t%0,%3\n\t" \
+ "move\t%1,$0\n\t" \
+ "j\t2b\n\t" \
+ ".previous\n\t" \
+ ".section\t__ex_table,\"a\"\n\t" \
+ ".dword\t1b,3b\n\t" \
+ ".previous" \
+ :"=r" (__gu_err), "=r" (__gu_val) \
+ :"o" (__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("sb"); break; \
+case 2: __put_user_asm("sh"); break; \
+case 4: __put_user_asm("sw"); break; \
+case 8: __put_user_asm("sd"); break; \
+default: __put_user_unknown(); break; \
+} __pu_err; })
+
+#define __put_user_check(x,ptr,size,mask) ({ \
+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,mask)) { \
+switch (size) { \
+case 1: __put_user_asm("sb"); break; \
+case 2: __put_user_asm("sh"); break; \
+case 4: __put_user_asm("sw"); break; \
+case 8: __put_user_asm("sd"); break; \
+default: __put_user_unknown(); break; \
+} } __pu_err; })
+
+#define __put_user_asm(insn) \
+({ \
+__asm__ __volatile__( \
+ "1:\t" insn "\t%1,%2\n\t" \
+ "move\t%0,$0\n" \
+ "2:\n\t" \
+ ".section\t.fixup,\"ax\"\n" \
+ "3:\tli\t%0,%3\n\t" \
+ "j\t2b\n\t" \
+ ".previous\n\t" \
+ ".section\t__ex_table,\"a\"\n\t" \
+ ".dword\t1b,3b\n\t" \
+ ".previous" \
+ :"=r" (__pu_err) \
+ :"r" (__pu_val), "o" (__m(__pu_addr)), "i" (-EFAULT)); })
+
+extern void __put_user_unknown(void);
+
+/*
+ * We're generating jump to subroutines which will be outside the range of
+ * jump instructions
+ */
+#ifdef MODULE
+#define __MODULE_JAL(destination) \
+ ".set\tnoat\n\t" \
+ "la\t$1, " #destination "\n\t" \
+ "jalr\t$1\n\t" \
+ ".set\tat\n\t"
+#else
+#define __MODULE_JAL(destination) \
+ "jal\t" #destination "\n\t"
+#endif
+
+#define copy_to_user_ret(to,from,n,retval) ({ \
+if (copy_to_user(to,from,n)) \
+ return retval; \
+})
+
+#define copy_from_user_ret(to,from,n,retval) ({ \
+if (copy_from_user(to,from,n)) \
+ return retval; \
+})
+
+extern size_t __copy_user(void *__to, const void *__from, size_t __n);
+
+#define __copy_to_user(to,from,n) ({ \
+ void *__cu_to; \
+ const void *__cu_from; \
+ long __cu_len; \
+ \
+ __cu_to = (to); \
+ __cu_from = (from); \
+ __cu_len = (n); \
+ __asm__ __volatile__( \
+ "move\t$4, %1\n\t" \
+ "move\t$5, %2\n\t" \
+ "move\t$6, %3\n\t" \
+ __MODULE_JAL(__copy_user) \
+ "move\t%0, $6" \
+ : "=r" (__cu_len) \
+ : "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
+ : "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", "$15", \
+ "$24", "$31","memory"); \
+ __cu_len; \
+})
+
+#define __copy_from_user(to,from,n) ({ \
+ void *__cu_to; \
+ const void *__cu_from; \
+ long __cu_len; \
+ \
+ __cu_to = (to); \
+ __cu_from = (from); \
+ __cu_len = (n); \
+ __asm__ __volatile__( \
+ "move\t$4, %1\n\t" \
+ "move\t$5, %2\n\t" \
+ "move\t$6, %3\n\t" \
+ ".set\tnoreorder\n\t" \
+ __MODULE_JAL(__copy_user) \
+ ".set\tnoat\n\t" \
+ "daddu\t$1, %2, %3\n\t" \
+ ".set\tat\n\t" \
+ ".set\treorder\n\t" \
+ "move\t%0, $6" \
+ : "=r" (__cu_len) \
+ : "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
+ : "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", "$15", \
+ "$24", "$31","memory"); \
+ __cu_len; \
+})
+
+#define copy_to_user(to,from,n) ({ \
+ void *__cu_to; \
+ const void *__cu_from; \
+ long __cu_len; \
+ \
+ __cu_to = (to); \
+ __cu_from = (from); \
+ __cu_len = (n); \
+ if (access_ok(VERIFY_WRITE, __cu_to, __cu_len)) \
+ __asm__ __volatile__( \
+ "move\t$4, %1\n\t" \
+ "move\t$5, %2\n\t" \
+ "move\t$6, %3\n\t" \
+ __MODULE_JAL(__copy_user) \
+ "move\t%0, $6" \
+ : "=r" (__cu_len) \
+ : "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
+ : "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", \
+ "$15", "$24", "$31","memory"); \
+ __cu_len; \
+})
+
+#define copy_from_user(to,from,n) ({ \
+ void *__cu_to; \
+ const void *__cu_from; \
+ long __cu_len; \
+ \
+ __cu_to = (to); \
+ __cu_from = (from); \
+ __cu_len = (n); \
+ if (access_ok(VERIFY_READ, __cu_from, __cu_len)) \
+ __asm__ __volatile__( \
+ "move\t$4, %1\n\t" \
+ "move\t$5, %2\n\t" \
+ "move\t$6, %3\n\t" \
+ ".set\tnoreorder\n\t" \
+ __MODULE_JAL(__copy_user) \
+ ".set\tnoat\n\t" \
+ "daddu\t$1, %2, %3\n\t" \
+ ".set\tat\n\t" \
+ ".set\treorder\n\t" \
+ "move\t%0, $6" \
+ : "=r" (__cu_len) \
+ : "r" (__cu_to), "r" (__cu_from), "r" (__cu_len) \
+ : "$4", "$5", "$6", "$8", "$9", "$10", "$11", "$12", \
+ "$15", "$24", "$31","memory"); \
+ __cu_len; \
+})
+
+extern inline __kernel_size_t
+__clear_user(void *addr, __kernel_size_t size)
+{
+ __kernel_size_t res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, $0\n\t"
+ "move\t$6, %2\n\t"
+ __MODULE_JAL(__bzero)
+ "move\t%0, $6"
+ : "=r" (res)
+ : "r" (addr), "r" (size)
+ : "$4", "$5", "$6", "$8", "$9", "$31");
+
+ return res;
+}
+
+#define clear_user(addr,n) ({ \
+void * __cl_addr = (addr); \
+unsigned long __cl_size = (n); \
+if (__cl_size && __access_ok(VERIFY_WRITE, ((unsigned long)(__cl_addr)), __cl_size)) \
+__cl_size = __clear_user(__cl_addr, __cl_size); \
+__cl_size; })
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire
+ * buffer filled, else strlen.
+ */
+extern inline long
+__strncpy_from_user(char *__to, const char *__from, long __len)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
+
+ return res;
+}
+
+extern inline long
+strncpy_from_user(char *__to, const char *__from, long __len)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ "move\t$6, %3\n\t"
+ __MODULE_JAL(__strncpy_from_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (__to), "r" (__from), "r" (__len)
+ : "$2", "$3", "$4", "$5", "$6", "$8", "$31", "memory");
+
+ return res;
+}
+
+/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
+extern inline long __strlen_user(const char *s)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", "$8", "$31");
+
+ return res;
+}
+
+extern inline long strlen_user(const char *s)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ __MODULE_JAL(__strlen_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s)
+ : "$2", "$4", "$8", "$31");
+
+ return res;
+}
+
+/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
+extern inline long __strnlen_user(const char *s, long n)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strlen_user_nocheck_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", "$8", "$31");
+
+ return res;
+}
+
+extern inline long strnlen_user(const char *s, long n)
+{
+ long res;
+
+ __asm__ __volatile__(
+ "move\t$4, %1\n\t"
+ "move\t$5, %2\n\t"
+ __MODULE_JAL(__strlen_user_asm)
+ "move\t%0, $2"
+ : "=r" (res)
+ : "r" (s), "r" (n)
+ : "$2", "$4", "$5", "$8", "$31");
+
+ return res;
+}
+
+struct exception_table_entry
+{
+ unsigned long insn;
+ unsigned long nextinsn;
+};
+
+/* 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_UACCESS_H */
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