/* SPDX-License-Identifier: GPL-2.0 */
#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/page-flags.h>

#include <asm/intrinsics.h>
#include <linux/pgtable.h>
#include <asm/io.h>
#include <asm/extable.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 get_fs()  (current_thread_info()->addr_limit)
#define set_fs(x) (current_thread_info()->addr_limit = (x))

#define uaccess_kernel()        (get_fs().seg == KERNEL_DS.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.
 */
static inline int __access_ok(const void __user *p, unsigned long size)
{
        unsigned long addr = (unsigned long)p;
        unsigned long seg = get_fs().seg;
        return likely(addr <= seg) &&
         (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
}
#define access_ok(addr, size)   __access_ok((addr), (size))

/*
 * 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)))
#define get_user(x, ptr)        __get_user_check((x), (ptr), sizeof(*(ptr)))

/*
 * 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)))

#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,    \
                  (__force 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)                                              \
({                                                                                      \
        const __typeof__(*(ptr)) __user *__gu_ptr = (ptr);                              \
        __typeof__ (size) __gu_size = (size);                                           \
        long __gu_err = -EFAULT;                                                        \
        unsigned long __gu_val = 0;                                                     \
        if (!check || __access_ok(__gu_ptr, size))                                      \
                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) = (__force __typeof__(*(__gu_ptr))) __gu_val;                               \
        __gu_err;                                                                       \
})

#define __get_user_nocheck(x, ptr, size)        __do_get_user(0, x, ptr, size)
#define __get_user_check(x, ptr, size)  __do_get_user(1, x, ptr, size)

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)                                              \
({                                                                                      \
        __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))                                 \
                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)
#define __put_user_check(x, ptr, size)  __do_put_user(1, x, ptr, size)

/*
 * Complex access routines
 */
extern unsigned long __must_check __copy_user (void __user *to, const void __user *from,
                                               unsigned long count);

static inline unsigned long
raw_copy_to_user(void __user *to, const void *from, unsigned long count)
{
        return __copy_user(to, (__force void __user *) from, count);
}

static inline unsigned long
raw_copy_from_user(void *to, const void __user *from, unsigned long count)
{
        return __copy_user((__force void __user *) to, from, count);
}

#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

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))                          \
                __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))                                 \
                __sfu_ret = __strncpy_from_user((to), __sfu_from, (n)); \
        __sfu_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))                           \
                __su_ret = __strnlen_user(__su_str, len);       \
        __su_ret;                                               \
})

#define ARCH_HAS_TRANSLATE_MEM_PTR      1
static __inline__ void *
xlate_dev_mem_ptr(phys_addr_t p)
{
        struct page *page;
        void *ptr;

        page = pfn_to_page(p >> PAGE_SHIFT);
        if (PageUncached(page))
                ptr = (void *)p + __IA64_UNCACHED_OFFSET;
        else
                ptr = __va(p);

        return ptr;
}

#endif /* _ASM_IA64_UACCESS_H */