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/* SPDX-License-Identifier: GPL-2.0-or-later / / * OpenRISC Linux * * Linux architectural port borrowing liberally from similar works of * others. All original copyrights apply as per the original source * declaration. * * OpenRISC implementation: * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com> * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> * et al. / #ifndef __ASM_OPENRISC_UACCESS_H #define __ASM_OPENRISC_UACCESS_H / * User space memory access functions / #include <linux/prefetch.h> #include <linux/string.h> #include <asm/page.h> #include <asm/extable.h> / * The fs value determines whether argument validity checking should be * performed or not. If get_fs() == USER_DS, checking is performed, with * get_fs() == KERNEL_DS, checking is bypassed. * * For historical reasons, these macros are grossly misnamed. / / addr_limit is the maximum accessible address for the task. we misuse * the KERNEL_DS and USER_DS values to both assign and compare the * addr_limit values through the equally misnamed get/set_fs macros. * (see above) / #define KERNEL_DS (~0UL) #define USER_DS (TASK_SIZE) #define get_fs() (current_thread_info()->addr_limit) #define set_fs(x) (current_thread_info()->addr_limit = (x)) #define segment_eq(a, b) ((a) == (b)) / Ensure that the range from addr to addr+size is all within the process' * address space / #define __range_ok(addr, size) (size <= get_fs() && addr <= (get_fs()-size)) / Ensure that addr is below task's addr_limit / #define __addr_ok(addr) ((unsigned long) addr < get_fs()) #define access_ok(addr, size) \ ({ \ unsigned long __ao_addr = (unsigned long)(addr); \ unsigned long __ao_size = (unsigned long)(size); \ __range_ok(__ao_addr, __ao_size); \ }) / * These are 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 uglyness from the user. * * The "__xxx" versions of the user access functions are versions that * do not verify the address space, that must have been done previously * with a separate "access_ok()" call (this is used when we do multiple * accesses to the same area of user memory). * * As we use the same address space for kernel and user data on the * PowerPC, we can just do these as direct assignments. (Of course, the * exception handling means that it's no longer "just"...) / #define get_user(x, ptr) \ __get_user_check((x), (ptr), sizeof((ptr))) #define put_user(x, ptr) \ __put_user_check((__typeof__((ptr)))(x), (ptr), sizeof((ptr))) #define __get_user(x, ptr) \ __get_user_nocheck((x), (ptr), sizeof((ptr))) #define __put_user(x, ptr) \ __put_user_nocheck((__typeof__((ptr)))(x), (ptr), sizeof((ptr))) extern long __put_user_bad(void); #define __put_user_nocheck(x, ptr, size) \ ({ \ long __pu_err; \ __put_user_size((x), (ptr), (size), __pu_err); \ __pu_err; \ }) #define __put_user_check(x, ptr, size) \ ({ \ long __pu_err = -EFAULT; \ __typeof__((ptr)) __pu_addr = (ptr); \ if (access_ok(__pu_addr, size)) \ __put_user_size((x), __pu_addr, (size), __pu_err); \ __pu_err; \ }) #define __put_user_size(x, ptr, size, retval) \ do { \ retval = 0; \ switch (size) { \ case 1: __put_user_asm(x, ptr, retval, "l.sb"); break; \ case 2: __put_user_asm(x, ptr, retval, "l.sh"); break; \ case 4: __put_user_asm(x, ptr, retval, "l.sw"); break; \ case 8: __put_user_asm2(x, ptr, retval); break; \ default: __put_user_bad(); \ } \ } while (0) struct __large_struct { unsigned long buf[100]; }; #define __m(x) ((struct __large_struct )(x)) / * We don't tell gcc that we are accessing memory, but this is OK * because we do not write to any memory gcc knows about, so there * are no aliasing issues. / #define __put_user_asm(x, addr, err, op) \ __asm__ __volatile__( \ "1: "op" 0(%2),%1\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ "3: l.addi %0,r0,%3\n" \ " l.j 2b\n" \ " l.nop\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .align 2\n" \ " .long 1b,3b\n" \ ".previous" \ : "=r"(err) \ : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err)) #define __put_user_asm2(x, addr, err) \ __asm__ __volatile__( \ "1: l.sw 0(%2),%1\n" \ "2: l.sw 4(%2),%H1\n" \ "3:\n" \ ".section .fixup,\"ax\"\n" \ "4: l.addi %0,r0,%3\n" \ " l.j 3b\n" \ " l.nop\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .align 2\n" \ " .long 1b,4b\n" \ " .long 2b,4b\n" \ ".previous" \ : "=r"(err) \ : "r"(x), "r"(addr), "i"(-EFAULT), "0"(err)) #define __get_user_nocheck(x, ptr, size) \ ({ \ long __gu_err; \ __get_user_size((x), (ptr), (size), __gu_err); \ __gu_err; \ }) #define __get_user_check(x, ptr, size) \ ({ \ long __gu_err = -EFAULT; \ const __typeof__((ptr)) __gu_addr = (ptr); \ if (access_ok(__gu_addr, size)) \ __get_user_size((x), __gu_addr, (size), __gu_err); \ else \ (x) = (__typeof__((ptr))) 0; \ __gu_err; \ }) extern long __get_user_bad(void); #define __get_user_size(x, ptr, size, retval) \ do { \ retval = 0; \ switch (size) { \ case 1: __get_user_asm(x, ptr, retval, "l.lbz"); break; \ case 2: __get_user_asm(x, ptr, retval, "l.lhz"); break; \ case 4: __get_user_asm(x, ptr, retval, "l.lwz"); break; \ case 8: __get_user_asm2(x, ptr, retval); break; \ default: (x) = (__typeof__((ptr)))__get_user_bad(); \ } \ } while (0) #define __get_user_asm(x, addr, err, op) \ { \ unsigned long __gu_tmp; \ __asm__ __volatile__( \ "1: "op" %1,0(%2)\n" \ "2:\n" \ ".section .fixup,\"ax\"\n" \ "3: l.addi %0,r0,%3\n" \ " l.addi %1,r0,0\n" \ " l.j 2b\n" \ " l.nop\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .align 2\n" \ " .long 1b,3b\n" \ ".previous" \ : "=r"(err), "=r"(__gu_tmp) \ : "r"(addr), "i"(-EFAULT), "0"(err)); \ (x) = (__typeof__((addr)))__gu_tmp; \ } #define __get_user_asm2(x, addr, err) \ { \ unsigned long long __gu_tmp; \ __asm__ __volatile__( \ "1: l.lwz %1,0(%2)\n" \ "2: l.lwz %H1,4(%2)\n" \ "3:\n" \ ".section .fixup,\"ax\"\n" \ "4: l.addi %0,r0,%3\n" \ " l.addi %1,r0,0\n" \ " l.addi %H1,r0,0\n" \ " l.j 3b\n" \ " l.nop\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ " .align 2\n" \ " .long 1b,4b\n" \ " .long 2b,4b\n" \ ".previous" \ : "=r"(err), "=&r"(__gu_tmp) \ : "r"(addr), "i"(-EFAULT), "0"(err)); \ (x) = (__typeof__((addr)))( \ (__typeof__((x)-(x)))__gu_tmp); \ } / more complex routines / extern unsigned long __must_check __copy_tofrom_user(void to, const void from, unsigned long size); static inline unsigned long raw_copy_from_user(void to, const void __user from, unsigned long size) { return __copy_tofrom_user(to, (__force const void )from, size); } static inline unsigned long raw_copy_to_user(void to, const void __user from, unsigned long size) { return __copy_tofrom_user((__force void )to, from, size); } #define INLINE_COPY_FROM_USER #define INLINE_COPY_TO_USER extern unsigned long __clear_user(void addr, unsigned long size); static inline __must_check unsigned long clear_user(void addr, unsigned long size) { if (likely(access_ok(addr, size))) size = __clear_user(addr, size); return size; } #define user_addr_max() \ (uaccess_kernel() ? ~0UL : TASK_SIZE) extern long strncpy_from_user(char dest, const char __user src, long count); extern __must_check long strnlen_user(const char __user str, long n); #endif /* __ASM_OPENRISC_UACCESS_H */

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