mirror of
https://github.com/JakeHillion/object-introspection.git
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78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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extern "C" {
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#include <fcntl.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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}
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namespace {
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template <size_t N>
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struct StringLiteral {
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constexpr StringLiteral(const char (&str)[N]) {
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std::copy_n(str, N, value);
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}
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char value[N];
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};
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} // namespace
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/*
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* The Syscall structure describes a `syscall(2)` in a generic manner.
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* The struct is used by `OIDebugger::remoteSyscall` to define the return type
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* and statically check the number of arguments being passed. Currently, I don't
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* know how to use the _Args to also statically check the type of the arguments.
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* In the meantime, I can use the size of _Args to do a simple count check.
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*/
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template <StringLiteral _Name,
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unsigned long _SysNum,
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typename _RetType,
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typename... _Args>
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struct Syscall {
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/* User friendly syscall name */
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static constexpr auto Name = _Name.value;
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/* The syscall's number (see <sys/syscall.h>) */
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static constexpr unsigned long SysNum = _SysNum;
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/* The syscall's return type */
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using RetType = _RetType;
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/* The number of arguments the syscall takes */
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static constexpr size_t ArgsCount = sizeof...(_Args);
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static_assert(ArgsCount <= 6,
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"X64 syscalls support a maximum of 6 arguments");
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};
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/*
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* The list of syscalls we want to be able to use on the remote process.
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* The types passed to `struct Syscall` come directly from `man 2 <SYSCALL>`.
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* Don't hesitate to expand this list if you need more syscalls!
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*/
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using SysOpen = Syscall<"open", SYS_open, int, const char*, int, mode_t>;
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using SysClose = Syscall<"close", SYS_close, int, int>;
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using SysFsync = Syscall<"fsync", SYS_fsync, int, int>;
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using SysMmap =
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Syscall<"mmap", SYS_mmap, void*, void*, size_t, int, int, int, off_t>;
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using SysMunmap = Syscall<"munmap", SYS_munmap, int, void*, size_t>;
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