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, 346 insertions, 0 deletions

diff --git a/include/asm-ppc64/uaccess.h b/include/asm-ppc64/uaccess.h
new file mode 100644
index 000000000000..05b5943ab1ee
--- /dev/null
+++ b/include/asm-ppc64/uaccess.h
@@ -0,0 +1,346 @@
+#ifndef _PPC64_UACCESS_H
+#define _PPC64_UACCESS_H
+
+/* 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __ASSEMBLY__
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <asm/processor.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(0UL)
+#define USER_DS         MAKE_MM_SEG(0xf000000000000000UL)
+
+#define get_ds()        (KERNEL_DS)
+#define get_fs()        (current->thread.fs)
+#define set_fs(val)     (current->thread.fs = (val))
+
+#define segment_eq(a,b) ((a).seg == (b).seg)
+
+/*
+ * Use the alpha trick for checking ranges:
+ *
+ * Is a address valid? This does a straightforward calculation rather
+ * than tests.
+ *
+ * Address valid if:
+ *  - "addr" doesn't have any high-bits set
+ *  - AND "size" doesn't have any high-bits set
+ *  - OR we are in kernel mode.
+ *
+ * We dont have to check for high bits in (addr+size) because the first
+ * two checks force the maximum result to be below the start of the
+ * kernel region.
+ */
+#define __access_ok(addr,size,segment) \
+        (((segment).seg & (addr | size )) == 0)
+
+#define access_ok(type,addr,size) \
+        __access_ok(((__force unsigned long)(addr)),(size),get_fs())
+
+/* this function will go away soon - use access_ok() instead */
+static 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;
+};
+
+/* Returns 0 if exception not found and fixup otherwise.  */
+extern unsigned long search_exception_table(unsigned long);
+
+/*
+ * 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).
+ *
+ * As we use the same address space for kernel and user data on the
+ * PowerPC, we can just do these as direct assignments.  (Of course, the
+ * exception handling means that it's no longer "just"...)
+ */
+#define get_user(x,ptr) \
+  __get_user_check((x),(ptr),sizeof(*(ptr)))
+#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
+
+extern long __put_user_bad(void);
+
+#define __put_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __pu_err;                                          \
+        might_sleep();                                          \
+        __chk_user_ptr(ptr);                                    \
+        __put_user_size((x),(ptr),(size),__pu_err,-EFAULT);     \
+        __pu_err;                                               \
+})
+
+#define __put_user_check(x,ptr,size)                                    \
+({                                                                      \
+        long __pu_err = -EFAULT;                                        \
+        void __user *__pu_addr = (ptr);                                 \
+        might_sleep();                                                  \
+        if (access_ok(VERIFY_WRITE,__pu_addr,size))                     \
+                __put_user_size((x),__pu_addr,(size),__pu_err,-EFAULT); \
+        __pu_err;                                                       \
+})
+
+#define __put_user_size(x,ptr,size,retval,errret)                       \
+do {                                                                    \
+        retval = 0;                                                     \
+        switch (size) {                                                 \
+          case 1: __put_user_asm(x,ptr,retval,"stb",errret); break;     \
+          case 2: __put_user_asm(x,ptr,retval,"sth",errret); break;     \
+          case 4: __put_user_asm(x,ptr,retval,"stw",errret); break;     \
+          case 8: __put_user_asm(x,ptr,retval,"std",errret); break;     \
+          default: __put_user_bad();                                    \
+        }                                                               \
+} while (0)
+
+/*
+ * We don't tell gcc that we are accessing memory, but this is OK
+ * because we do not write to any memory gcc knows about, so there
+ * are no aliasing issues.
+ */
+#define __put_user_asm(x, addr, err, op, errret)                \
+        __asm__ __volatile__(                                   \
+                "1:     "op" %1,0(%2)   # put_user\n"           \
+                "2:\n"                                          \
+                ".section .fixup,\"ax\"\n"                      \
+                "3:     li %0,%3\n"                             \
+                "       b 2b\n"                                 \
+                ".previous\n"                                   \
+                ".section __ex_table,\"a\"\n"                   \
+                "       .align 3\n"                             \
+                "       .llong 1b,3b\n"                         \
+                ".previous"                                     \
+                : "=r"(err)                                     \
+                : "r"(x), "b"(addr), "i"(errret), "0"(err))
+
+
+#define __get_user_nocheck(x,ptr,size)                          \
+({                                                              \
+        long __gu_err, __gu_val;                                \
+        might_sleep();                                          \
+        __get_user_size(__gu_val,(ptr),(size),__gu_err,-EFAULT);\
+        (x) = (__typeof__(*(ptr)))__gu_val;                     \
+        __gu_err;                                               \
+})
+
+#define __get_user_check(x,ptr,size)                                    \
+({                                                                      \
+        long __gu_err = -EFAULT, __gu_val = 0;                          \
+        const __typeof__(*(ptr)) __user *__gu_addr = (ptr);             \
+        might_sleep();                                                  \
+        if (access_ok(VERIFY_READ,__gu_addr,size))                      \
+                __get_user_size(__gu_val,__gu_addr,(size),__gu_err,-EFAULT);\
+        (x) = (__typeof__(*(ptr)))__gu_val;                             \
+        __gu_err;                                                       \
+})
+
+extern long __get_user_bad(void);
+
+#define __get_user_size(x,ptr,size,retval,errret)                       \
+do {                                                                    \
+        retval = 0;                                                     \
+        __chk_user_ptr(ptr);                                            \
+        switch (size) {                                                 \
+          case 1: __get_user_asm(x,ptr,retval,"lbz",errret); break;     \
+          case 2: __get_user_asm(x,ptr,retval,"lhz",errret); break;     \
+          case 4: __get_user_asm(x,ptr,retval,"lwz",errret); break;     \
+          case 8: __get_user_asm(x,ptr,retval,"ld",errret);  break;     \
+          default: (x) = __get_user_bad();                              \
+        }                                                               \
+} while (0)
+
+#define __get_user_asm(x, addr, err, op, errret)        \
+        __asm__ __volatile__(                           \
+                "1:     "op" %1,0(%2)   # get_user\n"   \
+                "2:\n"                                  \
+                ".section .fixup,\"ax\"\n"              \
+                "3:     li %0,%3\n"                     \
+                "       li %1,0\n"                      \
+                "       b 2b\n"                         \
+                ".previous\n"                           \
+                ".section __ex_table,\"a\"\n"           \
+                "       .align 3\n"                     \
+                "       .llong 1b,3b\n"                 \
+                ".previous"                             \
+                : "=r"(err), "=r"(x)                    \
+                : "b"(addr), "i"(errret), "0"(err))
+
+/* more complex routines */
+
+extern unsigned long __copy_tofrom_user(void __user *to, const void __user *from,
+                                        unsigned long size);
+
+static inline unsigned long
+__copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
+{
+        if (__builtin_constant_p(n)) {
+                unsigned long ret;
+
+                switch (n) {
+                case 1:
+                        __get_user_size(*(u8 *)to, from, 1, ret, 1);
+                        return ret;
+                case 2:
+                        __get_user_size(*(u16 *)to, from, 2, ret, 2);
+                        return ret;
+                case 4:
+                        __get_user_size(*(u32 *)to, from, 4, ret, 4);
+                        return ret;
+                case 8:
+                        __get_user_size(*(u64 *)to, from, 8, ret, 8);
+                        return ret;
+                }
+        }
+        return __copy_tofrom_user((__force void __user *) to, from, n);
+}
+
+static inline unsigned long
+__copy_from_user(void *to, const void __user *from, unsigned long n)
+{
+        might_sleep();
+        return __copy_from_user_inatomic(to, from, n);
+}
+
+static inline unsigned long
+__copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
+{
+        if (__builtin_constant_p(n)) {
+                unsigned long ret;
+
+                switch (n) {
+                case 1:
+                        __put_user_size(*(u8 *)from, (u8 __user *)to, 1, ret, 1);
+                        return ret;
+                case 2:
+                        __put_user_size(*(u16 *)from, (u16 __user *)to, 2, ret, 2);
+                        return ret;
+                case 4:
+                        __put_user_size(*(u32 *)from, (u32 __user *)to, 4, ret, 4);
+                        return ret;
+                case 8:
+                        __put_user_size(*(u64 *)from, (u64 __user *)to, 8, ret, 8);
+                        return ret;
+                }
+        }
+        return __copy_tofrom_user(to, (__force const void __user *) from, n);
+}
+
+static inline unsigned long
+__copy_to_user(void __user *to, const void *from, unsigned long n)
+{
+        might_sleep();
+        return __copy_to_user_inatomic(to, from, n);
+}
+
+#define __copy_in_user(to, from, size) \
+        __copy_tofrom_user((to), (from), (size))
+
+extern unsigned long copy_from_user(void *to, const void __user *from,
+                                    unsigned long n);
+extern unsigned long copy_to_user(void __user *to, const void *from,
+                                  unsigned long n);
+extern unsigned long copy_in_user(void __user *to, const void __user *from,
+                                  unsigned long n);
+
+extern unsigned long __clear_user(void __user *addr, unsigned long size);
+
+static inline unsigned long
+clear_user(void __user *addr, unsigned long size)
+{
+        might_sleep();
+        if (likely(access_ok(VERIFY_WRITE, addr, size)))
+                size = __clear_user(addr, size);
+        return size;
+}
+
+extern int __strncpy_from_user(char *dst, const char __user *src, long count);
+
+static inline long
+strncpy_from_user(char *dst, const char __user *src, long count)
+{
+        might_sleep();
+        if (likely(access_ok(VERIFY_READ, src, 1)))
+                return __strncpy_from_user(dst, src, count);
+        return -EFAULT;
+}
+
+/*
+ * Return the size of a string (including the ending 0)
+ *
+ * Return 0 for error
+ */
+extern int __strnlen_user(const char __user *str, long len);
+
+/*
+ * Returns the length of the string at str (including the null byte),
+ * or 0 if we hit a page we can't access,
+ * or something > len if we didn't find a null byte.
+ */
+static inline int strnlen_user(const char __user *str, long len)
+{
+        might_sleep();
+        if (likely(access_ok(VERIFY_READ, str, 1)))
+                return __strnlen_user(str, len);
+        return 0;
+}
+
+#define strlen_user(str)        strnlen_user((str), 0x7ffffffe)
+
+#endif  /* __ASSEMBLY__ */
+
+#endif  /* _PPC64_UACCESS_H */