mirror of
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182 lines
7.6 KiB
C++
182 lines
7.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Checked.h>
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#include <AK/Error.h>
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#include <AK/Forward.h>
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#include <AK/Time.h>
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#include <AK/Userspace.h>
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#include <Kernel/KString.h>
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#include <Kernel/UnixTypes.h>
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ErrorOr<NonnullOwnPtr<Kernel::KString>> try_copy_kstring_from_user(Userspace<char const*>, size_t);
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ErrorOr<Time> copy_time_from_user(timespec const*);
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ErrorOr<Time> copy_time_from_user(timeval const*);
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template<typename T>
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ErrorOr<Time> copy_time_from_user(Userspace<T*>);
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[[nodiscard]] Optional<u32> user_atomic_fetch_add_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_exchange_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_load_relaxed(u32 volatile* var);
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[[nodiscard]] bool user_atomic_store_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<bool> user_atomic_compare_exchange_relaxed(u32 volatile* var, u32& expected, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_fetch_and_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_fetch_and_not_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_fetch_or_relaxed(u32 volatile* var, u32 val);
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[[nodiscard]] Optional<u32> user_atomic_fetch_xor_relaxed(u32 volatile* var, u32 val);
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ErrorOr<void> copy_to_user(void*, void const*, size_t);
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ErrorOr<void> copy_from_user(void*, void const*, size_t);
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ErrorOr<void> memset_user(void*, int, size_t);
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extern "C" {
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void* memcpy(void*, void const*, size_t);
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[[nodiscard]] int strncmp(char const* s1, char const* s2, size_t n);
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[[nodiscard]] char* strstr(char const* haystack, char const* needle);
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[[nodiscard]] int strcmp(char const*, char const*);
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[[nodiscard]] size_t strlen(char const*);
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[[nodiscard]] size_t strnlen(char const*, size_t);
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void* memset(void*, int, size_t);
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[[nodiscard]] int memcmp(void const*, void const*, size_t);
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void* memmove(void* dest, void const* src, size_t n);
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void const* memmem(void const* haystack, size_t, void const* needle, size_t);
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[[nodiscard]] inline u16 ntohs(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
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[[nodiscard]] inline u16 htons(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_from_user(T* dest, T const* src)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_from_user(dest, src, sizeof(T));
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_to_user(T* dest, T const* src)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_to_user(dest, src, sizeof(T));
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_from_user(T* dest, Userspace<T const*> src)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_from_user(dest, src.unsafe_userspace_ptr(), sizeof(T));
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_from_user(T* dest, Userspace<T*> src)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_from_user(dest, src.unsafe_userspace_ptr(), sizeof(T));
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}
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#define DEPRECATE_COPY_FROM_USER_TYPE(T, REPLACEMENT) \
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template<> \
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[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) ErrorOr<void> copy_from_user<T>(T*, const T*) \
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{ \
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VERIFY_NOT_REACHED(); \
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} \
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template<> \
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[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) ErrorOr<void> copy_from_user<T>(T*, Userspace<const T*>) \
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{ \
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VERIFY_NOT_REACHED(); \
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} \
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template<> \
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[[nodiscard]] inline __attribute__((deprecated("use " #REPLACEMENT " instead"))) ErrorOr<void> copy_from_user<T>(T*, Userspace<T*>) \
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{ \
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VERIFY_NOT_REACHED(); \
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}
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DEPRECATE_COPY_FROM_USER_TYPE(timespec, copy_time_from_user)
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DEPRECATE_COPY_FROM_USER_TYPE(timeval, copy_time_from_user)
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_to_user(Userspace<T*> dest, T const* src)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_to_user(dest.unsafe_userspace_ptr(), src, sizeof(T));
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_to_user(Userspace<T*> dest, void const* src, size_t size)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_to_user(dest.unsafe_userspace_ptr(), src, size);
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_from_user(void* dest, Userspace<T const*> src, size_t size)
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{
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static_assert(IsTriviallyCopyable<T>);
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return copy_from_user(dest, src.unsafe_userspace_ptr(), size);
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_n_from_user(T* dest, T const* src, size_t count)
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{
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static_assert(IsTriviallyCopyable<T>);
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Checked<size_t> size = sizeof(T);
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size *= count;
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if (size.has_overflow())
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return EOVERFLOW;
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return copy_from_user(dest, src, size.value());
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_n_to_user(T* dest, T const* src, size_t count)
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{
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static_assert(IsTriviallyCopyable<T>);
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Checked<size_t> size = sizeof(T);
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size *= count;
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if (size.has_overflow())
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return EOVERFLOW;
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return copy_to_user(dest, src, size.value());
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> copy_n_from_user(T* dest, Userspace<T const*> src, size_t count)
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{
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static_assert(IsTriviallyCopyable<T>);
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Checked<size_t> size = sizeof(T);
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size *= count;
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if (size.has_overflow())
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return EOVERFLOW;
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return copy_from_user(dest, src.unsafe_userspace_ptr(), size.value());
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}
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template<typename T>
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[[nodiscard]] inline ErrorOr<void> try_copy_n_to_user(Userspace<T*> dest, T const* src, size_t count)
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{
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static_assert(IsTriviallyCopyable<T>);
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Checked<size_t> size = sizeof(T);
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size *= count;
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if (size.has_overflow())
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return EOVERFLOW;
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return copy_to_user(dest.unsafe_userspace_ptr(), src, size.value());
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}
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template<typename T>
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inline ErrorOr<T> copy_typed_from_user(Userspace<T const*> user_data)
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{
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T data {};
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TRY(copy_from_user(&data, user_data));
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return data;
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}
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template<typename T>
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inline ErrorOr<T> copy_typed_from_user(Userspace<T*> user_data)
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{
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T data {};
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TRY(copy_from_user(&data, user_data));
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return data;
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}
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