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/* 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/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 */
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