Squashed 'externals/oaknut/' changes from c24f918e5..d0488d932

d0488d932 oaknut: 2.0.0
40ad78bbf oaknut: Implement DualCodeBlock and related support
9f131cfb5 oaknut: add configuration for standalone installation
69799b43c oaknut: Test building for Android on CI
1d51f5512 oaknut: 1.2.2
918bd94f0 oaknut: Eliminate -Wconversion warnings
316d8869e oaknut: Fix edgecases in MOVP2R on +/-4GiB boundary
d8634eaa1 oaknut: Fix page boundary error in ADP
d0ca9a24e oaknut: Update README examples for CPU feature detection
dbeec268b oaknut: feature_detection_freebsd: Warn about incompatibility with earlier FreeBSD versions
86e5386e2 oaknut: feature_detect: Support NetBSD
df4cf2d48 oaknut: feature_detect: Support OpenBSD
99dfff25a oaknut: feature_detection: Read ID registers
319b3d2c9 oaknut: Add basic CPU feature detection
23e9ddb4c oaknut: CI: Don't run slow tests on OpenBSD
734f1bdb4 oaknut: CI: Use up-to-date qemu
f462c9774 oaknut: CI: Build on OpenBSD
19cd42204 oaknut: code_block: Add NetBSD and OpenBSD support
18b86a3ec oaknut: SystemReg: Add more EL0 accessible registers
53c43bf0c oaknut/tests: Reduce iterations for MOVP2R
cc37df19e oaknut: Test on FreeBSD
a66b32d26 oaknut: Fix crossing sign boundary in PageOffset
206468d72 oaknut: CI: Add macos-arm64 build
e6eecc3f9 oaknut: 1.2.1
4252d8f4a oaknut: CMakeLists: Warnings are errors on MSVC
408eed65f oaknut: arm64_encode_helpers: remove unreachable code
bfc8eedfb oaknut: arm64_encode_helpers: p maybe unused
ff4456eca oaknut: Avoid negation of unsigned values
b4ac8fd6c oaknut: Fix MOV for applications of MOVN
0575cadc4 oaknut: Disable certain functionality where absolute addressing is not available
394a3c8f0 oaknut: Appease MSVC
011183670 oaknut: 1.2.0
e83c9f327 oaknut: Add VectorCodeGenerator
5eb122cc5 oaknut: Tidy up public header
45c5a7b25 oaknut: Fix clang-format errors
36243256f oaknut: Add `const` qualifier to `AddrOffset` ctor
4af500cb5 oaknut: Add `ptr` accessor to `Label`
bccb06669 oaknut: CodeGenerator const correctness
da0590a86 oaknut: github: Update package repositories

git-subtree-dir: externals/oaknut
git-subtree-split: d0488d9320ae673167dd9117223e3453d5ff102f

include/oaknut/feature_detection/feature_detection_freebsd.hpp

@@ -0,0 +1,62 @@
+// SPDX-FileCopyrightText: Copyright (c) 2023 merryhime <https://mary.rs>
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <cstdint>
+#include <optional>
+
+#include <sys/auxv.h>
+#include <sys/param.h>
+
+#include "oaknut/feature_detection/cpu_feature.hpp"
+#include "oaknut/feature_detection/feature_detection_hwcaps.hpp"
+#include "oaknut/feature_detection/id_registers.hpp"
+#include "oaknut/feature_detection/read_id_registers_directly.hpp"
+
+#ifndef AT_HWCAP
+#    define AT_HWCAP 16
+#endif
+#ifndef AT_HWCAP2
+#    define AT_HWCAP2 26
+#endif
+
+#if __FreeBSD_version < 1300114
+#    error "Incompatible ABI change (incorrect HWCAP definitions on earlier FreeBSD versions)"
+#endif
+
+namespace oaknut {
+
+namespace detail {
+
+inline unsigned long getauxval(int aux)
+{
+    unsigned long result = 0;
+    if (::elf_aux_info(aux, &result, static_cast<int>(sizeof result)) == 0) {
+        return result;
+    }
+    return 0;
+}
+
+}  // namespace detail
+
+inline CpuFeatures detect_features_via_hwcap()
+{
+    const unsigned long hwcap = detail::getauxval(AT_HWCAP);
+    const unsigned long hwcap2 = detail::getauxval(AT_HWCAP2);
+    return detect_features_via_hwcap(hwcap, hwcap2);
+}
+
+inline std::optional<id::IdRegisters> read_id_registers()
+{
+    // HWCAP_CPUID is falsely not set on many FreeBSD kernel versions,
+    // so we don't bother checking it.
+    return id::read_id_registers_directly();
+}
+
+inline CpuFeatures detect_features()
+{
+    return detect_features_via_hwcap();
+}
+
+}  // namespace oaknut