Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 365 insertions, 0 deletions

diff --git a/include/asm-x86_64/uaccess.h b/include/asm-x86_64/uaccess.h
new file mode 100644
index 000000000000..48f292752c96
--- /dev/null
+++ b/include/asm-x86_64/uaccess.h
@@ -0,0 +1,365 @@
+#ifndef __X86_64_UACCESS_H
+#define __X86_64_UACCESS_H
+
+/*
+ * User space memory access functions
+ */
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/prefetch.h>
+#include <asm/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 MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
+
+#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFFFFFFFFFFUL)
+#define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current_thread_info()->addr_limit)
+#define set_fs(x)       (current_thread_info()->addr_limit = (x))
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+#define __addr_ok(addr) (!((unsigned long)(addr) & (current_thread_info()->addr_limit.seg)))
+
+/*
+ * 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_thread_info()->addr_limit.seg)); \
+        flag; })
+
+#define access_ok(type, addr, size) (__range_not_ok(addr,size) == 0)
+
+/* this function will go away soon - use access_ok() instead */
+extern inline int __deprecated verify_area(int type, const void __user * 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.
+ */
+
+struct exception_table_entry
+{
+        unsigned long insn, fixup;
+};
+
+#define ARCH_HAS_SEARCH_EXTABLE
+
+/*
+ * 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","","ir",-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 */
+extern unsigned long copy_user_generic(void *to, const void *from, unsigned len); 
+
+extern unsigned long copy_to_user(void __user *to, const void *from, unsigned len); 
+extern unsigned long copy_from_user(void *to, const void __user *from, unsigned len); 
+extern unsigned long copy_in_user(void __user *to, const void __user *from, unsigned len); 
+
+static inline 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 inline 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 inline 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); 
+        }
+}       
+
+long strncpy_from_user(char *dst, const char __user *src, long count);
+long __strncpy_from_user(char *dst, const char __user *src, long count);
+long strnlen_user(const char __user *str, long n);
+long strlen_user(const char __user *str);
+unsigned long clear_user(void __user *mem, unsigned long len);
+unsigned long __clear_user(void __user *mem, unsigned long len);
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#endif /* __X86_64_UACCESS_H */