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, 408 insertions, 0 deletions

diff --git a/include/asm-ia64/uaccess.h b/include/asm-ia64/uaccess.h
new file mode 100644
index 000000000000..8edd9a90949c
--- /dev/null
+++ b/include/asm-ia64/uaccess.h
@@ -0,0 +1,408 @@
+#ifndef _ASM_IA64_UACCESS_H
+#define _ASM_IA64_UACCESS_H
+
+/*
+ * This file defines various macros to transfer memory areas across
+ * the user/kernel boundary.  This needs to be done carefully because
+ * this code is executed in kernel mode and uses user-specified
+ * addresses.  Thus, we need to be careful not to let the user to
+ * trick us into accessing kernel memory that would normally be
+ * inaccessible.  This code is also fairly performance sensitive,
+ * so we want to spend as little time doing safety checks as
+ * possible.
+ *
+ * To make matters a bit more interesting, these macros sometimes also
+ * called from within the kernel itself, in which case the address
+ * validity check must be skipped.  The get_fs() macro tells us what
+ * to do: if get_fs()==USER_DS, checking is performed, if
+ * get_fs()==KERNEL_DS, checking is bypassed.
+ *
+ * Note that even if the memory area specified by the user is in a
+ * valid address range, it is still possible that we'll get a page
+ * fault while accessing it.  This is handled by filling out an
+ * exception handler fixup entry for each instruction that has the
+ * potential to fault.  When such a fault occurs, the page fault
+ * handler checks to see whether the faulting instruction has a fixup
+ * associated and, if so, sets r8 to -EFAULT and clears r9 to 0 and
+ * then resumes execution at the continuation point.
+ *
+ * Based on <asm-alpha/uaccess.h>.
+ *
+ * Copyright (C) 1998, 1999, 2001-2004 Hewlett-Packard Co
+ *      David Mosberger-Tang <davidm@hpl.hp.com>
+ */
+
+#include <linux/compiler.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/page-flags.h>
+#include <linux/mm.h>
+
+#include <asm/intrinsics.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+
+/*
+ * For historical reasons, the following macros are grossly misnamed:
+ */
+#define KERNEL_DS       ((mm_segment_t) { ~0UL })               /* cf. access_ok() */
+#define USER_DS         ((mm_segment_t) { TASK_SIZE-1 })        /* cf. access_ok() */
+
+#define VERIFY_READ     0
+#define VERIFY_WRITE    1
+
+#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)
+
+/*
+ * When accessing user memory, we need to make sure the entire area really is in
+ * user-level space.  In order to do this efficiently, we make sure that the page at
+ * address TASK_SIZE is never valid.  We also need to make sure that the address doesn't
+ * point inside the virtually mapped linear page table.
+ */
+#define __access_ok(addr, size, segment)                                                \
+({                                                                                      \
+        __chk_user_ptr(addr);                                                           \
+        (likely((unsigned long) (addr) <= (segment).seg)                                \
+         && ((segment).seg == KERNEL_DS.seg                                             \
+             || likely(REGION_OFFSET((unsigned long) (addr)) < RGN_MAP_LIMIT)));        \
+})
+#define access_ok(type, addr, size)     __access_ok((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;
+}
+
+/*
+ * These are the main single-value transfer routines.  They automatically
+ * use the right size if we just have the right pointer type.
+ *
+ * Careful to not
+ * (a) re-use the arguments for side effects (sizeof/typeof is ok)
+ * (b) require any knowledge of processes at this stage
+ */
+#define put_user(x, ptr)        __put_user_check((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)), get_fs())
+#define get_user(x, ptr)        __get_user_check((x), (ptr), sizeof(*(ptr)), get_fs())
+
+/*
+ * The "__xxx" versions do not do address space checking, useful when
+ * doing multiple accesses to the same area (the programmer has to do the
+ * checks by hand with "access_ok()")
+ */
+#define __put_user(x, ptr)      __put_user_nocheck((__typeof__(*(ptr))) (x), (ptr), sizeof(*(ptr)))
+#define __get_user(x, ptr)      __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
+
+extern long __put_user_unaligned_unknown (void);
+
+#define __put_user_unaligned(x, ptr)                                                            \
+({                                                                                              \
+        long __ret;                                                                             \
+        switch (sizeof(*(ptr))) {                                                               \
+                case 1: __ret = __put_user((x), (ptr)); break;                                  \
+                case 2: __ret = (__put_user((x), (u8 __user *)(ptr)))                           \
+                        | (__put_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break;              \
+                case 4: __ret = (__put_user((x), (u16 __user *)(ptr)))                          \
+                        | (__put_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break;            \
+                case 8: __ret = (__put_user((x), (u32 __user *)(ptr)))                          \
+                        | (__put_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break;            \
+                default: __ret = __put_user_unaligned_unknown();                                \
+        }                                                                                       \
+        __ret;                                                                                  \
+})
+
+extern long __get_user_unaligned_unknown (void);
+
+#define __get_user_unaligned(x, ptr)                                                            \
+({                                                                                              \
+        long __ret;                                                                             \
+        switch (sizeof(*(ptr))) {                                                               \
+                case 1: __ret = __get_user((x), (ptr)); break;                                  \
+                case 2: __ret = (__get_user((x), (u8 __user *)(ptr)))                           \
+                        | (__get_user((x) >> 8, ((u8 __user *)(ptr) + 1))); break;              \
+                case 4: __ret = (__get_user((x), (u16 __user *)(ptr)))                          \
+                        | (__get_user((x) >> 16, ((u16 __user *)(ptr) + 1))); break;            \
+                case 8: __ret = (__get_user((x), (u32 __user *)(ptr)))                          \
+                        | (__get_user((x) >> 32, ((u32 __user *)(ptr) + 1))); break;            \
+                default: __ret = __get_user_unaligned_unknown();                                \
+        }                                                                                       \
+        __ret;                                                                                  \
+})
+
+#ifdef ASM_SUPPORTED
+  struct __large_struct { unsigned long buf[100]; };
+# define __m(x) (*(struct __large_struct __user *)(x))
+
+/* We need to declare the __ex_table section before we can use it in .xdata.  */
+asm (".section \"__ex_table\", \"a\"\n\t.previous");
+
+# define __get_user_size(val, addr, n, err)                                                     \
+do {                                                                                            \
+        register long __gu_r8 asm ("r8") = 0;                                                   \
+        register long __gu_r9 asm ("r9");                                                       \
+        asm ("\n[1:]\tld"#n" %0=%2%P2\t// %0 and %1 get overwritten by exception handler\n"     \
+             "\t.xdata4 \"__ex_table\", 1b-., 1f-.+4\n"                                         \
+             "[1:]"                                                                             \
+             : "=r"(__gu_r9), "=r"(__gu_r8) : "m"(__m(addr)), "1"(__gu_r8));                    \
+        (err) = __gu_r8;                                                                        \
+        (val) = __gu_r9;                                                                        \
+} while (0)
+
+/*
+ * The "__put_user_size()" macro tells gcc it reads from memory instead of writing it.  This
+ * is because they do not write to any memory gcc knows about, so there are no aliasing
+ * issues.
+ */
+# define __put_user_size(val, addr, n, err)                                                     \
+do {                                                                                            \
+        register long __pu_r8 asm ("r8") = 0;                                                   \
+        asm volatile ("\n[1:]\tst"#n" %1=%r2%P1\t// %0 gets overwritten by exception handler\n" \
+                      "\t.xdata4 \"__ex_table\", 1b-., 1f-.\n"                                  \
+                      "[1:]"                                                                    \
+                      : "=r"(__pu_r8) : "m"(__m(addr)), "rO"(val), "0"(__pu_r8));               \
+        (err) = __pu_r8;                                                                        \
+} while (0)
+
+#else /* !ASM_SUPPORTED */
+# define RELOC_TYPE     2       /* ip-rel */
+# define __get_user_size(val, addr, n, err)                             \
+do {                                                                    \
+        __ld_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE);   \
+        (err) = ia64_getreg(_IA64_REG_R8);                              \
+        (val) = ia64_getreg(_IA64_REG_R9);                              \
+} while (0)
+# define __put_user_size(val, addr, n, err)                                                     \
+do {                                                                                            \
+        __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned long) (val));    \
+        (err) = ia64_getreg(_IA64_REG_R8);                                                      \
+} while (0)
+#endif /* !ASM_SUPPORTED */
+
+extern void __get_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
+ * could clobber r8 and r9 (among others).  Thus, be careful not to evaluate it while
+ * using r8/r9.
+ */
+#define __do_get_user(check, x, ptr, size, segment)                                     \
+({                                                                                      \
+        const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);                              \
+        __typeof__ (size) __gu_size = (size);                                           \
+        long __gu_err = -EFAULT, __gu_val = 0;                                          \
+                                                                                        \
+        if (!check || __access_ok(__gu_ptr, size, segment))                             \
+                switch (__gu_size) {                                                    \
+                      case 1: __get_user_size(__gu_val, __gu_ptr, 1, __gu_err); break;  \
+                      case 2: __get_user_size(__gu_val, __gu_ptr, 2, __gu_err); break;  \
+                      case 4: __get_user_size(__gu_val, __gu_ptr, 4, __gu_err); break;  \
+                      case 8: __get_user_size(__gu_val, __gu_ptr, 8, __gu_err); break;  \
+                      default: __get_user_unknown(); break;                             \
+                }                                                                       \
+        (x) = (__typeof__(*(__gu_ptr))) __gu_val;                                       \
+        __gu_err;                                                                       \
+})
+
+#define __get_user_nocheck(x, ptr, size)        __do_get_user(0, x, ptr, size, KERNEL_DS)
+#define __get_user_check(x, ptr, size, segment) __do_get_user(1, x, ptr, size, segment)
+
+extern void __put_user_unknown (void);
+
+/*
+ * Evaluating arguments X, PTR, SIZE, and SEGMENT may involve subroutine-calls, which
+ * could clobber r8 (among others).  Thus, be careful not to evaluate them while using r8.
+ */
+#define __do_put_user(check, x, ptr, size, segment)                                     \
+({                                                                                      \
+        __typeof__ (x) __pu_x = (x);                                                    \
+        __typeof__ (*(ptr)) __user *__pu_ptr = (ptr);                                   \
+        __typeof__ (size) __pu_size = (size);                                           \
+        long __pu_err = -EFAULT;                                                        \
+                                                                                        \
+        if (!check || __access_ok(__pu_ptr, __pu_size, segment))                        \
+                switch (__pu_size) {                                                    \
+                      case 1: __put_user_size(__pu_x, __pu_ptr, 1, __pu_err); break;    \
+                      case 2: __put_user_size(__pu_x, __pu_ptr, 2, __pu_err); break;    \
+                      case 4: __put_user_size(__pu_x, __pu_ptr, 4, __pu_err); break;    \
+                      case 8: __put_user_size(__pu_x, __pu_ptr, 8, __pu_err); break;    \
+                      default: __put_user_unknown(); break;                             \
+                }                                                                       \
+        __pu_err;                                                                       \
+})
+
+#define __put_user_nocheck(x, ptr, size)        __do_put_user(0, x, ptr, size, KERNEL_DS)
+#define __put_user_check(x, ptr, size, segment) __do_put_user(1, x, ptr, size, segment)
+
+/*
+ * Complex access routines
+ */
+extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
+                                               unsigned long count);
+
+static inline unsigned long
+__copy_to_user (void __user *to, const void *from, unsigned long count)
+{
+        return __copy_user(to, (void __user *) from, count);
+}
+
+static inline unsigned long
+__copy_from_user (void *to, const void __user *from, unsigned long count)
+{
+        return __copy_user((void __user *) to, from, count);
+}
+
+#define __copy_to_user_inatomic         __copy_to_user
+#define __copy_from_user_inatomic       __copy_from_user
+#define copy_to_user(to, from, n)                                                       \
+({                                                                                      \
+        void __user *__cu_to = (to);                                                    \
+        const void *__cu_from = (from);                                                 \
+        long __cu_len = (n);                                                            \
+                                                                                        \
+        if (__access_ok(__cu_to, __cu_len, get_fs()))                                   \
+                __cu_len = __copy_user(__cu_to, (void __user *) __cu_from, __cu_len);   \
+        __cu_len;                                                                       \
+})
+
+#define copy_from_user(to, from, n)                                                     \
+({                                                                                      \
+        void *__cu_to = (to);                                                           \
+        const void __user *__cu_from = (from);                                          \
+        long __cu_len = (n);                                                            \
+                                                                                        \
+        __chk_user_ptr(__cu_from);                                                      \
+        if (__access_ok(__cu_from, __cu_len, get_fs()))                                 \
+                __cu_len = __copy_user((void __user *) __cu_to, __cu_from, __cu_len);   \
+        __cu_len;                                                                       \
+})
+
+#define __copy_in_user(to, from, size)  __copy_user((to), (from), (size))
+
+static inline unsigned long
+copy_in_user (void __user *to, const void __user *from, unsigned long n)
+{
+        if (likely(access_ok(VERIFY_READ, from, n) && access_ok(VERIFY_WRITE, to, n)))
+                n = __copy_user(to, from, n);
+        return n;
+}
+
+extern unsigned long __do_clear_user (void __user *, unsigned long);
+
+#define __clear_user(to, n)             __do_clear_user(to, n)
+
+#define clear_user(to, n)                                       \
+({                                                              \
+        unsigned long __cu_len = (n);                           \
+        if (__access_ok(to, __cu_len, get_fs()))                \
+                __cu_len = __do_clear_user(to, __cu_len);       \
+        __cu_len;                                               \
+})
+
+
+/*
+ * Returns: -EFAULT if exception before terminator, N if the entire buffer filled, else
+ * strlen.
+ */
+extern long __must_check __strncpy_from_user (char *to, const char __user *from, long to_len);
+
+#define strncpy_from_user(to, from, n)                                  \
+({                                                                      \
+        const char __user * __sfu_from = (from);                        \
+        long __sfu_ret = -EFAULT;                                       \
+        if (__access_ok(__sfu_from, 0, get_fs()))                       \
+                __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
+        __sfu_ret;                                                      \
+})
+
+/* Returns: 0 if bad, string length+1 (memory size) of string if ok */
+extern unsigned long __strlen_user (const char __user *);
+
+#define strlen_user(str)                                \
+({                                                      \
+        const char __user *__su_str = (str);            \
+        unsigned long __su_ret = 0;                     \
+        if (__access_ok(__su_str, 0, get_fs()))         \
+                __su_ret = __strlen_user(__su_str);     \
+        __su_ret;                                       \
+})
+
+/*
+ * Returns: 0 if exception before NUL or reaching the supplied limit
+ * (N), a value greater than N if the limit would be exceeded, else
+ * strlen.
+ */
+extern unsigned long __strnlen_user (const char __user *, long);
+
+#define strnlen_user(str, len)                                  \
+({                                                              \
+        const char __user *__su_str = (str);                    \
+        unsigned long __su_ret = 0;                             \
+        if (__access_ok(__su_str, 0, get_fs()))                 \
+                __su_ret = __strnlen_user(__su_str, len);       \
+        __su_ret;                                               \
+})
+
+/* Generic code can't deal with the location-relative format that we use for compactness.  */
+#define ARCH_HAS_SORT_EXTABLE
+#define ARCH_HAS_SEARCH_EXTABLE
+
+struct exception_table_entry {
+        int addr;       /* location-relative address of insn this fixup is for */
+        int cont;       /* location-relative continuation addr.; if bit 2 is set, r9 is set to 0 */
+};
+
+extern void ia64_handle_exception (struct pt_regs *regs, const struct exception_table_entry *e);
+extern const struct exception_table_entry *search_exception_tables (unsigned long addr);
+
+static inline int
+ia64_done_with_exception (struct pt_regs *regs)
+{
+        const struct exception_table_entry *e;
+        e = search_exception_tables(regs->cr_iip + ia64_psr(regs)->ri);
+        if (e) {
+                ia64_handle_exception(regs, e);
+                return 1;
+        }
+        return 0;
+}
+
+#define ARCH_HAS_TRANSLATE_MEM_PTR      1
+static __inline__ char *
+xlate_dev_mem_ptr (unsigned long p)
+{
+        struct page *page;
+        char * ptr;
+
+        page = pfn_to_page(p >> PAGE_SHIFT);
+        if (PageUncached(page))
+                ptr = (char *)p + __IA64_UNCACHED_OFFSET;
+        else
+                ptr = __va(p);
+
+        return ptr;
+}
+
+/*
+ * Convert a virtual cached kernel memory pointer to an uncached pointer
+ */
+static __inline__ char *
+xlate_dev_kmem_ptr (char * p)
+{
+        struct page *page;
+        char * ptr;
+
+        page = virt_to_page((unsigned long)p >> PAGE_SHIFT);
+        if (PageUncached(page))
+                ptr = (char *)__pa(p) + __IA64_UNCACHED_OFFSET;
+        else
+                ptr = p;
+
+        return ptr;
+}
+
+#endif /* _ASM_IA64_UACCESS_H */