^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * OpenRISC Linux
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Linux architectural port borrowing liberally from similar works of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * others. All original copyrights apply as per the original source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * declaration.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * OpenRISC implementation:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * et al.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #ifndef __ASM_OPENRISC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define __ASM_OPENRISC_UACCESS_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * User space memory access functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/prefetch.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <asm/extable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * The fs value determines whether argument validity checking should be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * performed or not. If get_fs() == USER_DS, checking is performed, with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * get_fs() == KERNEL_DS, checking is bypassed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * For historical reasons, these macros are grossly misnamed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) /* addr_limit is the maximum accessible address for the task. we misuse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * the KERNEL_DS and USER_DS values to both assign and compare the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * addr_limit values through the equally misnamed get/set_fs macros.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * (see above)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define KERNEL_DS (~0UL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define USER_DS (TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define get_fs() (current_thread_info()->addr_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define set_fs(x) (current_thread_info()->addr_limit = (x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define uaccess_kernel() (get_fs() == KERNEL_DS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /* Ensure that the range from addr to addr+size is all within the process'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * address space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static inline int __range_ok(unsigned long addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) const mm_segment_t fs = get_fs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return size <= fs && addr <= (fs - size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define access_ok(addr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) __chk_user_ptr(addr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) __range_ok((unsigned long)(addr), (size)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * These are the main single-value transfer routines. They automatically
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * use the right size if we just have the right pointer type.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) * This gets kind of ugly. We want to return _two_ values in "get_user()"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * and yet we don't want to do any pointers, because that is too much
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * of a performance impact. Thus we have a few rather ugly macros here,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * and hide all the uglyness from the user.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * The "__xxx" versions of the user access functions are versions that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * do not verify the address space, that must have been done previously
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * with a separate "access_ok()" call (this is used when we do multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * accesses to the same area of user memory).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * As we use the same address space for kernel and user data on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * PowerPC, we can just do these as direct assignments. (Of course, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * exception handling means that it's no longer "just"...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) #define get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) __get_user_check((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #define put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) __put_user_check((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #define __get_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) __get_user_nocheck((x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #define __put_user(x, ptr) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) __put_user_nocheck((__typeof__(*(ptr)))(x), (ptr), sizeof(*(ptr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) extern long __put_user_bad(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) #define __put_user_nocheck(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) long __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) __put_user_size((x), (ptr), (size), __pu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define __put_user_check(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) long __pu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) __typeof__(*(ptr)) __user *__pu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (access_ok(__pu_addr, size)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) __put_user_size((x), __pu_addr, (size), __pu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) __pu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #define __put_user_size(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) retval = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) switch (size) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) case 1: __put_user_asm(x, ptr, retval, "l.sb"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) case 8: __put_user_asm2(x, ptr, retval); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) default: __put_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct __large_struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned long buf[100];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) #define __m(x) (*(struct __large_struct *)(x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) * We don't tell gcc that we are accessing memory, but this is OK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * because we do not write to any memory gcc knows about, so there
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * are no aliasing issues.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #define __put_user_asm(x, addr, err, op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) "1: "op" 0(%2),%1\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) "2:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) "3: l.addi %0,r0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) " l.j 2b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) " l.nop\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) ".section __ex_table,\"a\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) " .align 2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) " .long 1b,3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ".previous" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) : "=r"(err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #define __put_user_asm2(x, addr, err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) "1: l.sw 0(%2),%1\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) "2: l.sw 4(%2),%H1\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) "3:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) "4: l.addi %0,r0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) " l.j 3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) " l.nop\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ".section __ex_table,\"a\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) " .align 2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) " .long 1b,4b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) " .long 2b,4b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) ".previous" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) : "=r"(err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) #define __get_user_nocheck(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) long __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) __get_user_size((x), (ptr), (size), __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) #define __get_user_check(x, ptr, size) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) ({ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) long __gu_err = -EFAULT; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (access_ok(__gu_addr, size)) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) __get_user_size((x), __gu_addr, (size), __gu_err); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) else \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) (x) = (__typeof__(*(ptr))) 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) __gu_err; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) extern long __get_user_bad(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #define __get_user_size(x, ptr, size, retval) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) retval = 0; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) switch (size) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) case 8: __get_user_asm2(x, ptr, retval); break; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) default: (x) = (__typeof__(*(ptr)))__get_user_bad(); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #define __get_user_asm(x, addr, err, op) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) unsigned long __gu_tmp; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) "1: "op" %1,0(%2)\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) "2:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) "3: l.addi %0,r0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) " l.addi %1,r0,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) " l.j 2b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) " l.nop\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) ".section __ex_table,\"a\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) " .align 2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) " .long 1b,3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) ".previous" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) : "=r"(err), "=r"(__gu_tmp) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) : "r"(addr), "i"(-EFAULT), "0"(err)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) (x) = (__typeof__(*(addr)))__gu_tmp; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) #define __get_user_asm2(x, addr, err) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned long long __gu_tmp; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) __asm__ __volatile__( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) "1: l.lwz %1,0(%2)\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) "2: l.lwz %H1,4(%2)\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) "3:\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) ".section .fixup,\"ax\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) "4: l.addi %0,r0,%3\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) " l.addi %1,r0,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) " l.addi %H1,r0,0\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) " l.j 3b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) " l.nop\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) ".previous\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) ".section __ex_table,\"a\"\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) " .align 2\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) " .long 1b,4b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) " .long 2b,4b\n" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) ".previous" \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) : "=r"(err), "=&r"(__gu_tmp) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) : "r"(addr), "i"(-EFAULT), "0"(err)); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) (x) = (__typeof__(*(addr)))( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) (__typeof__((x)-(x)))__gu_tmp); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* more complex routines */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) extern unsigned long __must_check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) __copy_tofrom_user(void *to, const void *from, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) raw_copy_from_user(void *to, const void __user *from, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return __copy_tofrom_user(to, (__force const void *)from, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) static inline unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) raw_copy_to_user(void __user *to, const void *from, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return __copy_tofrom_user((__force void *)to, from, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) #define INLINE_COPY_FROM_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) #define INLINE_COPY_TO_USER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) extern unsigned long __clear_user(void __user *addr, unsigned long size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) static inline __must_check unsigned long
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) clear_user(void __user *addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (likely(access_ok(addr, size)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) size = __clear_user(addr, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) #define user_addr_max() \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) (uaccess_kernel() ? ~0UL : TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) extern long strncpy_from_user(char *dest, const char __user *src, long count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) extern __must_check long strnlen_user(const char __user *str, long n);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) #endif /* __ASM_OPENRISC_UACCESS_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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