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/* SPDX-License-Identifier: GPL-2.0-only / / * Copyright (C) 2012 Regents of the University of California * * This file was copied from include/asm-generic/uaccess.h / #ifndef _ASM_RISCV_UACCESS_H #define _ASM_RISCV_UACCESS_H / * User space memory access functions / #include <linux/errno.h> #include <linux/compiler.h> #include <linux/thread_info.h> #include <asm/byteorder.h> #include <asm/extable.h> #include <asm/asm.h> #define __enable_user_access() \ __asm__ __volatile__ ("csrs sstatus, %0" : : "r" (SR_SUM) : "memory") #define __disable_user_access() \ __asm__ __volatile__ ("csrc sstatus, %0" : : "r" (SR_SUM) : "memory") / * 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. / #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) #define KERNEL_DS MAKE_MM_SEG(~0UL) #define USER_DS MAKE_MM_SEG(TASK_SIZE) #define get_fs() (current_thread_info()->addr_limit) static inline void set_fs(mm_segment_t fs) { current_thread_info()->addr_limit = fs; } #define segment_eq(a, b) ((a).seg == (b).seg) #define user_addr_max() (get_fs().seg) /* * access_ok: - Checks if a user space pointer is valid * @addr: User space pointer to start of block to check * @size: Size of block to check * * Context: User context only. This function may sleep. * * Checks if a pointer to a block of memory in user space is valid. * * Returns true (nonzero) if the memory block may be valid, false (zero) * if it is definitely invalid. * * Note that, depending on architecture, this function probably just * checks that the pointer is in the user space range - after calling * this function, memory access functions may still return -EFAULT. / #define access_ok(addr, size) ({ \ __chk_user_ptr(addr); \ likely(__access_ok((unsigned long __force)(addr), (size))); \ }) / * Ensure that the range [addr, addr+size) is within the process's * address space / static inline int __access_ok(unsigned long addr, unsigned long size) { const mm_segment_t fs = get_fs(); return size <= fs.seg && addr <= fs.seg - size; } / * The exception table consists of pairs of addresses: the first is the * address of an instruction that is allowed to fault, and the second is * the address at which the program should continue. No registers are * modified, so it is entirely up to the continuation code to figure out * what to do. * * All the routines below use bits of fixup code that are out of line * with the main instruction path. This means when everything is well, * we don't even have to jump over them. Further, they do not intrude * on our cache or tlb entries. / #define __LSW 0 #define __MSW 1 / * The "__xxx" versions of the user access functions do not verify the address * space - it must have been done previously with a separate "access_ok()" * call. / #define __get_user_asm(insn, x, ptr, err) \ do { \ uintptr_t __tmp; \ __typeof__(x) __x; \ __enable_user_access(); \ __asm__ __volatile__ ( \ "1:\n" \ " " insn " %1, %3\n" \ "2:\n" \ " .section .fixup,\"ax\"\n" \ " .balign 4\n" \ "3:\n" \ " li %0, %4\n" \ " li %1, 0\n" \ " jump 2b, %2\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 3b\n" \ " .previous" \ : "+r" (err), "=&r" (__x), "=r" (__tmp) \ : "m" ((ptr)), "i" (-EFAULT)); \ __disable_user_access(); \ (x) = __x; \ } while (0) #ifdef CONFIG_64BIT #define __get_user_8(x, ptr, err) \ __get_user_asm("ld", x, ptr, err) #else /* !CONFIG_64BIT / #define __get_user_8(x, ptr, err) \ do { \ u32 __user __ptr = (u32 __user )(ptr); \ u32 __lo, __hi; \ uintptr_t __tmp; \ __enable_user_access(); \ __asm__ __volatile__ ( \ "1:\n" \ " lw %1, %4\n" \ "2:\n" \ " lw %2, %5\n" \ "3:\n" \ " .section .fixup,\"ax\"\n" \ " .balign 4\n" \ "4:\n" \ " li %0, %6\n" \ " li %1, 0\n" \ " li %2, 0\n" \ " jump 3b, %3\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 4b\n" \ " " RISCV_PTR " 2b, 4b\n" \ " .previous" \ : "+r" (err), "=&r" (__lo), "=r" (__hi), \ "=r" (__tmp) \ : "m" (__ptr[__LSW]), "m" (__ptr[__MSW]), \ "i" (-EFAULT)); \ __disable_user_access(); \ (x) = (__typeof__(x))((__typeof__((x)-(x)))( \ (((u64)__hi << 32) \| __lo))); \ } while (0) #endif / CONFIG_64BIT / /* * __get_user: - Get a simple variable from user space, with less checking. * @x: Variable to store result. * @ptr: Source address, in user space. * * Context: User context only. This function may sleep. * * This macro copies a single simple variable from user space to kernel * space. It supports simple types like char and int, but not larger * data types like structures or arrays. * * @ptr must have pointer-to-simple-variable type, and the result of * dereferencing @ptr must be assignable to @x without a cast. * * Caller must check the pointer with access_ok() before calling this * function. * * Returns zero on success, or -EFAULT on error. * On error, the variable @x is set to zero. / #define __get_user(x, ptr) \ ({ \ register long __gu_err = 0; \ const __typeof__((ptr)) __user __gu_ptr = (ptr); \ __chk_user_ptr(__gu_ptr); \ switch (sizeof(__gu_ptr)) { \ case 1: \ __get_user_asm("lb", (x), __gu_ptr, __gu_err); \ break; \ case 2: \ __get_user_asm("lh", (x), __gu_ptr, __gu_err); \ break; \ case 4: \ __get_user_asm("lw", (x), __gu_ptr, __gu_err); \ break; \ case 8: \ __get_user_8((x), __gu_ptr, __gu_err); \ break; \ default: \ BUILD_BUG(); \ } \ __gu_err; \ }) /** * get_user: - Get a simple variable from user space. * @x: Variable to store result. * @ptr: Source address, in user space. * * Context: User context only. This function may sleep. * * This macro copies a single simple variable from user space to kernel * space. It supports simple types like char and int, but not larger * data types like structures or arrays. * * @ptr must have pointer-to-simple-variable type, and the result of * dereferencing @ptr must be assignable to @x without a cast. * * Returns zero on success, or -EFAULT on error. * On error, the variable @x is set to zero. / #define get_user(x, ptr) \ ({ \ const __typeof__((ptr)) __user __p = (ptr); \ might_fault(); \ access_ok(__p, sizeof(__p)) ? \ __get_user((x), __p) : \ ((x) = (__force __typeof__(x))0, -EFAULT); \ }) #define __put_user_asm(insn, x, ptr, err) \ do { \ uintptr_t __tmp; \ __typeof__((ptr)) __x = x; \ __enable_user_access(); \ __asm__ __volatile__ ( \ "1:\n" \ " " insn " %z3, %2\n" \ "2:\n" \ " .section .fixup,\"ax\"\n" \ " .balign 4\n" \ "3:\n" \ " li %0, %4\n" \ " jump 2b, %1\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 3b\n" \ " .previous" \ : "+r" (err), "=r" (__tmp), "=m" ((ptr)) \ : "rJ" (__x), "i" (-EFAULT)); \ __disable_user_access(); \ } while (0) #ifdef CONFIG_64BIT #define __put_user_8(x, ptr, err) \ __put_user_asm("sd", x, ptr, err) #else /* !CONFIG_64BIT / #define __put_user_8(x, ptr, err) \ do { \ u32 __user __ptr = (u32 __user )(ptr); \ u64 __x = (__typeof__((x)-(x)))(x); \ uintptr_t __tmp; \ __enable_user_access(); \ __asm__ __volatile__ ( \ "1:\n" \ " sw %z4, %2\n" \ "2:\n" \ " sw %z5, %3\n" \ "3:\n" \ " .section .fixup,\"ax\"\n" \ " .balign 4\n" \ "4:\n" \ " li %0, %6\n" \ " jump 3b, %1\n" \ " .previous\n" \ " .section __ex_table,\"a\"\n" \ " .balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 4b\n" \ " " RISCV_PTR " 2b, 4b\n" \ " .previous" \ : "+r" (err), "=r" (__tmp), \ "=m" (__ptr[__LSW]), \ "=m" (__ptr[__MSW]) \ : "rJ" (__x), "rJ" (__x >> 32), "i" (-EFAULT)); \ __disable_user_access(); \ } while (0) #endif / CONFIG_64BIT / /* * __put_user: - Write a simple value into user space, with less checking. * @x: Value to copy to user space. * @ptr: Destination address, in user space. * * Context: User context only. This function may sleep. * * This macro copies a single simple value from kernel space to user * space. It supports simple types like char and int, but not larger * data types like structures or arrays. * * @ptr must have pointer-to-simple-variable type, and @x must be assignable * to the result of dereferencing @ptr. * * Caller must check the pointer with access_ok() before calling this * function. * * Returns zero on success, or -EFAULT on error. / #define __put_user(x, ptr) \ ({ \ register long __pu_err = 0; \ __typeof__((ptr)) __user __gu_ptr = (ptr); \ __chk_user_ptr(__gu_ptr); \ switch (sizeof(__gu_ptr)) { \ case 1: \ __put_user_asm("sb", (x), __gu_ptr, __pu_err); \ break; \ case 2: \ __put_user_asm("sh", (x), __gu_ptr, __pu_err); \ break; \ case 4: \ __put_user_asm("sw", (x), __gu_ptr, __pu_err); \ break; \ case 8: \ __put_user_8((x), __gu_ptr, __pu_err); \ break; \ default: \ BUILD_BUG(); \ } \ __pu_err; \ }) /** * put_user: - Write a simple value into user space. * @x: Value to copy to user space. * @ptr: Destination address, in user space. * * Context: User context only. This function may sleep. * * This macro copies a single simple value from kernel space to user * space. It supports simple types like char and int, but not larger * data types like structures or arrays. * * @ptr must have pointer-to-simple-variable type, and @x must be assignable * to the result of dereferencing @ptr. * * Returns zero on success, or -EFAULT on error. / #define put_user(x, ptr) \ ({ \ __typeof__((ptr)) __user __p = (ptr); \ might_fault(); \ access_ok(__p, sizeof(__p)) ? \ __put_user((x), __p) : \ -EFAULT; \ }) extern unsigned long __must_check __asm_copy_to_user(void __user to, const void from, unsigned long n); extern unsigned long __must_check __asm_copy_from_user(void to, const void __user from, unsigned long n); static inline unsigned long raw_copy_from_user(void to, const void __user from, unsigned long n) { return __asm_copy_from_user(to, from, n); } static inline unsigned long raw_copy_to_user(void __user to, const void from, unsigned long n) { return __asm_copy_to_user(to, from, n); } extern long strncpy_from_user(char dest, const char __user src, long count); extern long __must_check strlen_user(const char __user str); extern long __must_check strnlen_user(const char __user str, long n); extern unsigned long __must_check __clear_user(void __user addr, unsigned long n); static inline unsigned long __must_check clear_user(void __user to, unsigned long n) { might_fault(); return access_ok(to, n) ? __clear_user(to, n) : n; } /* * Atomic compare-and-exchange, but with a fixup for userspace faults. Faults * will set "err" to -EFAULT, while successful accesses return the previous * value. / #define __cmpxchg_user(ptr, old, new, err, size, lrb, scb) \ ({ \ __typeof__(ptr) __ptr = (ptr); \ __typeof__((ptr)) __old = (old); \ __typeof__((ptr)) __new = (new); \ __typeof__((ptr)) __ret; \ __typeof__(err) __err = 0; \ register unsigned int __rc; \ __enable_user_access(); \ switch (size) { \ case 4: \ __asm__ __volatile__ ( \ "0:\n" \ " lr.w" #scb " %[ret], %[ptr]\n" \ " bne %[ret], %z[old], 1f\n" \ " sc.w" #lrb " %[rc], %z[new], %[ptr]\n" \ " bnez %[rc], 0b\n" \ "1:\n" \ ".section .fixup,\"ax\"\n" \ ".balign 4\n" \ "2:\n" \ " li %[err], %[efault]\n" \ " jump 1b, %[rc]\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ ".balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 2b\n" \ ".previous\n" \ : [ret] "=&r" (__ret), \ [rc] "=&r" (__rc), \ [ptr] "+A" (__ptr), \ [err] "=&r" (__err) \ : [old] "rJ" (__old), \ [new] "rJ" (__new), \ [efault] "i" (-EFAULT)); \ break; \ case 8: \ __asm__ __volatile__ ( \ "0:\n" \ " lr.d" #scb " %[ret], %[ptr]\n" \ " bne %[ret], %z[old], 1f\n" \ " sc.d" #lrb " %[rc], %z[new], %[ptr]\n" \ " bnez %[rc], 0b\n" \ "1:\n" \ ".section .fixup,\"ax\"\n" \ ".balign 4\n" \ "2:\n" \ " li %[err], %[efault]\n" \ " jump 1b, %[rc]\n" \ ".previous\n" \ ".section __ex_table,\"a\"\n" \ ".balign " RISCV_SZPTR "\n" \ " " RISCV_PTR " 1b, 2b\n" \ ".previous\n" \ : [ret] "=&r" (__ret), \ [rc] "=&r" (__rc), \ [ptr] "+A" (__ptr), \ [err] "=&r" (__err) \ : [old] "rJ" (__old), \ [new] "rJ" (__new), \ [efault] "i" (-EFAULT)); \ break; \ default: \ BUILD_BUG(); \ } \ __disable_user_access(); \ (err) = __err; \ __ret; \ }) #endif /* _ASM_RISCV_UACCESS_H */

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