--- /dev/null
+#ifndef _X86_64_UACCESS_H
+#define _X86_64_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <lwk/compiler.h>
+#include <lwk/errno.h>
+#include <lwk/prefetch.h>
+#include <lwk/task.h>
+#include <arch/page.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, these macros are grossly misnamed.
+ */
+
+#define KERNEL_DS 0xFFFFFFFFFFFFFFFFUL
+#define USER_DS PAGE_OFFSET
+
+#define get_ds() (KERNEL_DS)
+#define get_fs() (current->arch.addr_limit)
+#define set_fs(x) (current->arch.addr_limit = (x))
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+#define __addr_ok(addr) (!((unsigned long)(addr) & (current->arch.addr_limit)))
+
+/*
+ * Uhhuh, this needs 65-bit arithmetic. We have a carry..
+ */
+#define __range_not_ok(addr,size) ({ \
+ unsigned long flag,sum; \
+ __chk_user_ptr(addr); \
+ asm("# range_ok\n\r" \
+ "addq %3,%1 ; sbbq %0,%0 ; cmpq %1,%4 ; sbbq $0,%0" \
+ :"=&r" (flag), "=r" (sum) \
+ :"1" (addr),"g" ((long)(size)),"g" (current->arch.addr_limit)); \
+ flag; })
+
+#define access_ok(type, addr, size) (__range_not_ok(addr,size) == 0)
+
+/*
+ * These are 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 ugliness from the user.
+ *
+ * The "__xxx" versions of the user access functions are versions that
+ * do not verify the address space, that must have been done previously
+ * with a separate "access_ok()" call (this is used when we do multiple
+ * accesses to the same area of user memory).
+ */
+
+#define __get_user_x(size,ret,x,ptr) \
+ asm volatile("call __get_user_" #size \
+ :"=a" (ret),"=d" (x) \
+ :"c" (ptr) \
+ :"r8")
+
+/* Careful: we have to cast the result to the type of the pointer for sign reasons */
+#define get_user(x,ptr) \
+({ unsigned long __val_gu; \
+ int __ret_gu; \
+ __chk_user_ptr(ptr); \
+ switch(sizeof (*(ptr))) { \
+ case 1: __get_user_x(1,__ret_gu,__val_gu,ptr); break; \
+ case 2: __get_user_x(2,__ret_gu,__val_gu,ptr); break; \
+ case 4: __get_user_x(4,__ret_gu,__val_gu,ptr); break; \
+ case 8: __get_user_x(8,__ret_gu,__val_gu,ptr); break; \
+ default: __get_user_bad(); break; \
+ } \
+ (x) = (typeof(*(ptr)))__val_gu; \
+ __ret_gu; \
+})
+
+extern void __put_user_1(void);
+extern void __put_user_2(void);
+extern void __put_user_4(void);
+extern void __put_user_8(void);
+extern void __put_user_bad(void);
+
+#define __put_user_x(size,ret,x,ptr) \
+ asm volatile("call __put_user_" #size \
+ :"=a" (ret) \
+ :"c" (ptr),"d" (x) \
+ :"r8")
+
+#define put_user(x,ptr) \
+ __put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
+
+#define __get_user(x,ptr) \
+ __get_user_nocheck((x),(ptr),sizeof(*(ptr)))
+#define __put_user(x,ptr) \
+ __put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
+
+#define __get_user_unaligned __get_user
+#define __put_user_unaligned __put_user
+
+#define __put_user_nocheck(x,ptr,size) \
+({ \
+ int __pu_err; \
+ __put_user_size((x),(ptr),(size),__pu_err); \
+ __pu_err; \
+})
+
+
+#define __put_user_check(x,ptr,size) \
+({ \
+ int __pu_err; \
+ typeof(*(ptr)) __user *__pu_addr = (ptr); \
+ switch (size) { \
+ case 1: __put_user_x(1,__pu_err,x,__pu_addr); break; \
+ case 2: __put_user_x(2,__pu_err,x,__pu_addr); break; \
+ case 4: __put_user_x(4,__pu_err,x,__pu_addr); break; \
+ case 8: __put_user_x(8,__pu_err,x,__pu_addr); break; \
+ default: __put_user_bad(); \
+ } \
+ __pu_err; \
+})
+
+#define __put_user_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ __chk_user_ptr(ptr); \
+ switch (size) { \
+ case 1: __put_user_asm(x,ptr,retval,"b","b","iq",-EFAULT); break;\
+ case 2: __put_user_asm(x,ptr,retval,"w","w","ir",-EFAULT); break;\
+ case 4: __put_user_asm(x,ptr,retval,"l","k","ir",-EFAULT); break;\
+ case 8: __put_user_asm(x,ptr,retval,"q","","Zr",-EFAULT); break;\
+ default: __put_user_bad(); \
+ } \
+} while (0)
+
+/* FIXME: this hack is definitely wrong -AK */
+struct __large_struct { unsigned long buf[100]; };
+#define __m(x) (*(struct __large_struct __user *)(x))
+
+/*
+ * Tell gcc we read from memory instead of writing: this is because
+ * we do not write to any memory gcc knows about, so there are no
+ * aliasing issues.
+ */
+#define __put_user_asm(x, addr, err, itype, rtype, ltype, errno) \
+ asm volatile( \
+ "1: mov"itype" %"rtype"1,%2\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: mov %3,%0\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 8\n" \
+ " .quad 1b,3b\n" \
+ ".previous" \
+ : "=r"(err) \
+ : ltype (x), "m"(__m(addr)), "i"(errno), "0"(err))
+
+
+#define __get_user_nocheck(x,ptr,size) \
+({ \
+ int __gu_err; \
+ unsigned long __gu_val; \
+ __get_user_size(__gu_val,(ptr),(size),__gu_err); \
+ (x) = (typeof(*(ptr)))__gu_val; \
+ __gu_err; \
+})
+
+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_size(x,ptr,size,retval) \
+do { \
+ retval = 0; \
+ __chk_user_ptr(ptr); \
+ switch (size) { \
+ case 1: __get_user_asm(x,ptr,retval,"b","b","=q",-EFAULT); break;\
+ case 2: __get_user_asm(x,ptr,retval,"w","w","=r",-EFAULT); break;\
+ case 4: __get_user_asm(x,ptr,retval,"l","k","=r",-EFAULT); break;\
+ case 8: __get_user_asm(x,ptr,retval,"q","","=r",-EFAULT); break;\
+ default: (x) = __get_user_bad(); \
+ } \
+} while (0)
+
+#define __get_user_asm(x, addr, err, itype, rtype, ltype, errno) \
+ asm volatile( \
+ "1: mov"itype" %2,%"rtype"1\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: mov %3,%0\n" \
+ " xor"itype" %"rtype"1,%"rtype"1\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ ".section __ex_table,\"a\"\n" \
+ " .align 8\n" \
+ " .quad 1b,3b\n" \
+ ".previous" \
+ : "=r"(err), ltype (x) \
+ : "m"(__m(addr)), "i"(errno), "0"(err))
+
+/*
+ * Copy To/From Userspace
+ */
+
+/* Handles exceptions in both to and from, but doesn't do access_ok */
+__must_check unsigned long
+copy_user_generic(void *to, const void *from, unsigned len);
+
+__must_check unsigned long
+copy_to_user(void __user *to, const void *from, unsigned len);
+__must_check unsigned long
+copy_from_user(void *to, const void __user *from, unsigned len);
+__must_check unsigned long
+copy_in_user(void __user *to, const void __user *from, unsigned len);
+
+static __always_inline __must_check
+int __copy_from_user(void *dst, const void __user *src, unsigned size)
+{
+ int ret = 0;
+ if (!__builtin_constant_p(size))
+ return copy_user_generic(dst,(__force void *)src,size);
+ switch (size) {
+ case 1:__get_user_asm(*(u8*)dst,(u8 __user *)src,ret,"b","b","=q",1);
+ return ret;
+ case 2:__get_user_asm(*(u16*)dst,(u16 __user *)src,ret,"w","w","=r",2);
+ return ret;
+ case 4:__get_user_asm(*(u32*)dst,(u32 __user *)src,ret,"l","k","=r",4);
+ return ret;
+ case 8:__get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",8);
+ return ret;
+ case 10:
+ __get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",16);
+ if (unlikely(ret)) return ret;
+ __get_user_asm(*(u16*)(8+(char*)dst),(u16 __user *)(8+(char __user *)src),ret,"w","w","=r",2);
+ return ret;
+ case 16:
+ __get_user_asm(*(u64*)dst,(u64 __user *)src,ret,"q","","=r",16);
+ if (unlikely(ret)) return ret;
+ __get_user_asm(*(u64*)(8+(char*)dst),(u64 __user *)(8+(char __user *)src),ret,"q","","=r",8);
+ return ret;
+ default:
+ return copy_user_generic(dst,(__force void *)src,size);
+ }
+}
+
+static __always_inline __must_check
+int __copy_to_user(void __user *dst, const void *src, unsigned size)
+{
+ int ret = 0;
+ if (!__builtin_constant_p(size))
+ return copy_user_generic((__force void *)dst,src,size);
+ switch (size) {
+ case 1:__put_user_asm(*(u8*)src,(u8 __user *)dst,ret,"b","b","iq",1);
+ return ret;
+ case 2:__put_user_asm(*(u16*)src,(u16 __user *)dst,ret,"w","w","ir",2);
+ return ret;
+ case 4:__put_user_asm(*(u32*)src,(u32 __user *)dst,ret,"l","k","ir",4);
+ return ret;
+ case 8:__put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",8);
+ return ret;
+ case 10:
+ __put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",10);
+ if (unlikely(ret)) return ret;
+ asm("":::"memory");
+ __put_user_asm(4[(u16*)src],4+(u16 __user *)dst,ret,"w","w","ir",2);
+ return ret;
+ case 16:
+ __put_user_asm(*(u64*)src,(u64 __user *)dst,ret,"q","","ir",16);
+ if (unlikely(ret)) return ret;
+ asm("":::"memory");
+ __put_user_asm(1[(u64*)src],1+(u64 __user *)dst,ret,"q","","ir",8);
+ return ret;
+ default:
+ return copy_user_generic((__force void *)dst,src,size);
+ }
+}
+
+static __always_inline __must_check
+int __copy_in_user(void __user *dst, const void __user *src, unsigned size)
+{
+ int ret = 0;
+ if (!__builtin_constant_p(size))
+ return copy_user_generic((__force void *)dst,(__force void *)src,size);
+ switch (size) {
+ case 1: {
+ u8 tmp;
+ __get_user_asm(tmp,(u8 __user *)src,ret,"b","b","=q",1);
+ if (likely(!ret))
+ __put_user_asm(tmp,(u8 __user *)dst,ret,"b","b","iq",1);
+ return ret;
+ }
+ case 2: {
+ u16 tmp;
+ __get_user_asm(tmp,(u16 __user *)src,ret,"w","w","=r",2);
+ if (likely(!ret))
+ __put_user_asm(tmp,(u16 __user *)dst,ret,"w","w","ir",2);
+ return ret;
+ }
+
+ case 4: {
+ u32 tmp;
+ __get_user_asm(tmp,(u32 __user *)src,ret,"l","k","=r",4);
+ if (likely(!ret))
+ __put_user_asm(tmp,(u32 __user *)dst,ret,"l","k","ir",4);
+ return ret;
+ }
+ case 8: {
+ u64 tmp;
+ __get_user_asm(tmp,(u64 __user *)src,ret,"q","","=r",8);
+ if (likely(!ret))
+ __put_user_asm(tmp,(u64 __user *)dst,ret,"q","","ir",8);
+ return ret;
+ }
+ default:
+ return copy_user_generic((__force void *)dst,(__force void *)src,size);
+ }
+}
+
+__must_check long
+strncpy_from_user(char *dst, const char __user *src, long count);
+__must_check long
+__strncpy_from_user(char *dst, const char __user *src, long count);
+__must_check long strnlen_user(const char __user *str, long n);
+__must_check long __strnlen_user(const char __user *str, long n);
+__must_check long strlen_user(const char __user *str);
+__must_check unsigned long clear_user(void __user *mem, unsigned long len);
+__must_check unsigned long __clear_user(void __user *mem, unsigned long len);
+
+__must_check long __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size);
+
+static __must_check __always_inline int
+__copy_to_user_inatomic(void __user *dst, const void *src, unsigned size)
+{
+ return copy_user_generic((__force void *)dst, src, size);
+}
+
+#endif /* _X86_64_UACCESS_H */
