/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_UACCESS_H
#define _ASM_UACCESS_H

/*
 * User space memory access functions
 */

#include <linux/compiler.h>
#include <linux/string.h>
#include <asm/asi.h>
#include <asm/spitfire.h>
#include <asm/extable_64.h>

#include <asm/processor.h>

/*
 * Sparc64 is segmented, though more like the M68K than the I386.
 * We use the secondary ASI to address user memory, which references a
 * completely different VM map, thus there is zero chance of the user
 * doing something queer and tricking us into poking kernel memory.
 *
 * What is left here is basically what is needed for the other parts of
 * the kernel that expect to be able to manipulate, erum, "segments".
 * Or perhaps more properly, permissions.
 *
 * "For historical reasons, these macros are grossly misnamed." -Linus
 */

#define KERNEL_DS   ((mm_segment_t) { ASI_P })
#define USER_DS     ((mm_segment_t) { ASI_AIUS })       /* har har har */

#define get_fs() ((mm_segment_t){(current_thread_info()->current_ds)})

#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)

#define set_fs(val)                                                             \
do {                                                                            \
        current_thread_info()->current_ds = (val).seg;                          \
        __asm__ __volatile__ ("wr %%g0, %0, %%asi" : : "r" ((val).seg));        \
} while(0)

/*
 * Test whether a block of memory is a valid user space address.
 * Returns 0 if the range is valid, nonzero otherwise.
 */
static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
{
        if (__builtin_constant_p(size))
                return addr > limit - size;

        addr += size;
        if (addr < size)
                return true;

        return addr > limit;
}

#define __range_not_ok(addr, size, limit)                               \
({                                                                      \
        __chk_user_ptr(addr);                                           \
        __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
})

static inline int __access_ok(const void __user * addr, unsigned long size)
{
        return 1;
}

static inline int access_ok(const void __user * addr, unsigned long size)
{
        return 1;
}

void __retl_efault(void);

/* Uh, these should become 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.
 */
#define put_user(x, ptr) ({ \
        unsigned long __pu_addr = (unsigned long)(ptr); \
        __chk_user_ptr(ptr); \
        __put_user_nocheck((__typeof__(*(ptr)))(x), __pu_addr, sizeof(*(ptr)));\
})

#define get_user(x, ptr) ({ \
        unsigned long __gu_addr = (unsigned long)(ptr); \
        __chk_user_ptr(ptr); \
        __get_user_nocheck((x), __gu_addr, sizeof(*(ptr)), __typeof__(*(ptr)));\
})

#define __put_user(x, ptr) put_user(x, ptr)
#define __get_user(x, ptr) get_user(x, ptr)

struct __large_struct { unsigned long buf[100]; };
#define __m(x) ((struct __large_struct *)(x))

#define __put_user_nocheck(data, addr, size) ({                 \
        register int __pu_ret;                                  \
        switch (size) {                                         \
        case 1: __put_user_asm(data, b, addr, __pu_ret); break; \
        case 2: __put_user_asm(data, h, addr, __pu_ret); break; \
        case 4: __put_user_asm(data, w, addr, __pu_ret); break; \
        case 8: __put_user_asm(data, x, addr, __pu_ret); break; \
        default: __pu_ret = __put_user_bad(); break;            \
        }                                                       \
        __pu_ret;                                               \
})

#define __put_user_asm(x, size, addr, ret)                              \
__asm__ __volatile__(                                                   \
                "/* Put user asm, inline. */\n"                         \
        "1:\t"  "st"#size "a %1, [%2] %%asi\n\t"                        \
                "clr    %0\n"                                           \
        "2:\n\n\t"                                                      \
                ".section .fixup,#alloc,#execinstr\n\t"                 \
                ".align 4\n"                                            \
        "3:\n\t"                                                        \
                "sethi  %%hi(2b), %0\n\t"                               \
                "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
                " mov   %3, %0\n\n\t"                                   \
                ".previous\n\t"                                         \
                ".section __ex_table,\"a\"\n\t"                         \
                ".align 4\n\t"                                          \
                ".word  1b, 3b\n\t"                                     \
                ".previous\n\n\t"                                       \
               : "=r" (ret) : "r" (x), "r" (__m(addr)),                 \
                 "i" (-EFAULT))

int __put_user_bad(void);

#define __get_user_nocheck(data, addr, size, type) ({                        \
        register int __gu_ret;                                               \
        register unsigned long __gu_val;                                     \
        switch (size) {                                                      \
                case 1: __get_user_asm(__gu_val, ub, addr, __gu_ret); break; \
                case 2: __get_user_asm(__gu_val, uh, addr, __gu_ret); break; \
                case 4: __get_user_asm(__gu_val, uw, addr, __gu_ret); break; \
                case 8: __get_user_asm(__gu_val, x, addr, __gu_ret); break;  \
                default:                                                     \
                        __gu_val = 0;                                        \
                        __gu_ret = __get_user_bad();                         \
                        break;                                               \
        }                                                                    \
        data = (__force type) __gu_val;                                      \
         __gu_ret;                                                           \
})

#define __get_user_asm(x, size, addr, ret)                              \
__asm__ __volatile__(                                                   \
                "/* Get user asm, inline. */\n"                         \
        "1:\t"  "ld"#size "a [%2] %%asi, %1\n\t"                        \
                "clr    %0\n"                                           \
        "2:\n\n\t"                                                      \
                ".section .fixup,#alloc,#execinstr\n\t"                 \
                ".align 4\n"                                            \
        "3:\n\t"                                                        \
                "sethi  %%hi(2b), %0\n\t"                               \
                "clr    %1\n\t"                                         \
                "jmpl   %0 + %%lo(2b), %%g0\n\t"                        \
                " mov   %3, %0\n\n\t"                                   \
                ".previous\n\t"                                         \
                ".section __ex_table,\"a\"\n\t"                         \
                ".align 4\n\t"                                          \
                ".word  1b, 3b\n\n\t"                                   \
                ".previous\n\t"                                         \
               : "=r" (ret), "=r" (x) : "r" (__m(addr)),                \
                 "i" (-EFAULT))

int __get_user_bad(void);

unsigned long __must_check raw_copy_from_user(void *to,
                                             const void __user *from,
                                             unsigned long size);

unsigned long __must_check raw_copy_to_user(void __user *to,
                                           const void *from,
                                           unsigned long size);
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER

unsigned long __must_check raw_copy_in_user(void __user *to,
                                           const void __user *from,
                                           unsigned long size);

unsigned long __must_check __clear_user(void __user *, unsigned long);

#define clear_user __clear_user

__must_check long strnlen_user(const char __user *str, long n);

struct pt_regs;
unsigned long compute_effective_address(struct pt_regs *,
                                        unsigned int insn,
                                        unsigned int rd);

#endif /* _ASM_UACCESS_H */