253 lines
7.7 KiB
C
253 lines
7.7 KiB
C
/* 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 <linux/mm_types.h>
|
|
#include <asm/asi.h>
|
|
#include <asm/spitfire.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm-generic/access_ok.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.
|
|
*/
|
|
|
|
/*
|
|
* 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); \
|
|
})
|
|
|
|
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_kernel_nofault(dst, src, type, label) \
|
|
do { \
|
|
type *addr = (type __force *)(dst); \
|
|
type data = *(type *)src; \
|
|
register int __pu_ret; \
|
|
switch (sizeof(type)) { \
|
|
case 1: __put_kernel_asm(data, b, addr, __pu_ret); break; \
|
|
case 2: __put_kernel_asm(data, h, addr, __pu_ret); break; \
|
|
case 4: __put_kernel_asm(data, w, addr, __pu_ret); break; \
|
|
case 8: __put_kernel_asm(data, x, addr, __pu_ret); break; \
|
|
default: __pu_ret = __put_user_bad(); break; \
|
|
} \
|
|
if (__pu_ret) \
|
|
goto label; \
|
|
} while (0)
|
|
|
|
#define __put_kernel_asm(x, size, addr, ret) \
|
|
__asm__ __volatile__( \
|
|
"/* Put kernel asm, inline. */\n" \
|
|
"1:\t" "st"#size " %1, [%2]\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))
|
|
|
|
#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_kernel_nofault(dst, src, type, label) \
|
|
do { \
|
|
type *addr = (type __force *)(src); \
|
|
register int __gu_ret; \
|
|
register unsigned long __gu_val; \
|
|
switch (sizeof(type)) { \
|
|
case 1: __get_kernel_asm(__gu_val, ub, addr, __gu_ret); break; \
|
|
case 2: __get_kernel_asm(__gu_val, uh, addr, __gu_ret); break; \
|
|
case 4: __get_kernel_asm(__gu_val, uw, addr, __gu_ret); break; \
|
|
case 8: __get_kernel_asm(__gu_val, x, addr, __gu_ret); break; \
|
|
default: \
|
|
__gu_val = 0; \
|
|
__gu_ret = __get_user_bad(); \
|
|
break; \
|
|
} \
|
|
if (__gu_ret) \
|
|
goto label; \
|
|
*(type *)dst = (__force type) __gu_val; \
|
|
} while (0)
|
|
#define __get_kernel_asm(x, size, addr, ret) \
|
|
__asm__ __volatile__( \
|
|
"/* Get kernel asm, inline. */\n" \
|
|
"1:\t" "ld"#size " [%2], %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))
|
|
|
|
#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 */
|