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https://github.com/google/sandboxed-api.git
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6a1e4b881c
This allows us to remove some uses of macros. Related changes: - Make it clear that we support hosting sandboxed binaries from 64-bit processes only. CPU architectures are x86-64 and POWER64 (little endian). - Introduced CPU architecture macros, abstracting away compiler specifics PiperOrigin-RevId: 330918134 Change-Id: Ife7ad5f14723eec9f68055127b0583b8aecd38dd
84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
// Copyright 2020 Google LLC
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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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#ifndef SANDBOXED_API_SANDBOX2_CONFIG_H_
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#define SANDBOXED_API_SANDBOX2_CONFIG_H_
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#include <cstdint>
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#include "absl/base/config.h"
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// GCC/Clang define __x86_64__, Visual Studio uses _M_X64
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#if defined(__x86_64__) || defined(_M_X64)
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#define SAPI_X86_64 1
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// Check various spellings for 64-bit POWER. Not checking for Visual Studio, as
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// it does not support 64-bit POWER.
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#elif (defined(__PPC64__) || defined(__powerpc64__) || defined(__ppc64__)) && \
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defined(ABSL_IS_LITTLE_ENDIAN)
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#define SAPI_PPC64_LE 1
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// Spellings for AArch64
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#elif defined(__aarch64__) || defined(_M_ARM64)
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#define SAPI_ARM64 1
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#endif
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namespace sandbox2 {
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namespace cpu {
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// CPU architectures known to Sandbox2
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enum Architecture : uint16_t {
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// Linux: Use a magic value, so it can be easily spotted in the seccomp-bpf
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// bytecode decompilation stream. Must be < (1<<15), as/ that's the size of
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// data which can be returned by BPF.
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kUnknown = 0xCAF0,
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kX8664,
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kX86,
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kPPC64LE,
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kArm64,
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};
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} // namespace cpu
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namespace host_cpu {
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// Returns the current host CPU architecture if supported. If not supported,
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// returns cpu::kUnknown.
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constexpr cpu::Architecture Architecture() {
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#if defined(SAPI_X86_64)
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return cpu::kX8664;
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#elif defined(SAPI_PPC64_LE)
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return cpu::kPPC64LE;
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#else
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return cpu::kUnknown;
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#endif
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}
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constexpr bool IsX8664() { return Architecture() == cpu::kX8664; }
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constexpr bool IsPPC64LE() { return Architecture() == cpu::kPPC64LE; }
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constexpr bool IsArm64() { return Architecture() == cpu::kArm64; }
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} // namespace host_cpu
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static_assert(host_cpu::Architecture() != cpu::kUnknown,
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"Host CPU architecture is not supported: One of x86-64 or "
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"POWER64 (little endian) is required.");
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} // namespace sandbox2
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#endif // SANDBOXED_API_SANDBOX2_CONFIG_H_
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