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Port bootstrap build on OpenBSD #129080

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a0f6b36
Port bootstrap build on OpenBSD
am11 Jun 8, 2026
b430572
Merge branch 'main' into feature/port/openbsd-bootstrap-misc-fixes
am11 Jun 8, 2026
38c5dc1
Address CR feedback
am11 Jun 8, 2026
60e6f5f
Merge branch 'main' into feature/port/openbsd-bootstrap-misc-fixes
am11 Jun 8, 2026
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25 changes: 24 additions & 1 deletion eng/native/configurecompiler.cmake
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Expand Up @@ -325,9 +325,18 @@ if(CLR_CMAKE_HOST_LINUX)
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:-Wa,--noexecstack>)
add_linker_flag(-Wl,--build-id=sha1)
add_linker_flag(-Wl,-z,relro,-z,now)
elseif(CLR_CMAKE_HOST_FREEBSD OR CLR_CMAKE_HOST_OPENBSD)
elseif(CLR_CMAKE_HOST_FREEBSD)
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:-Wa,--noexecstack>)
add_linker_flag("-Wl,--build-id=sha1")
elseif(CLR_CMAKE_HOST_OPENBSD)
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:-Wa,--noexecstack>)
add_linker_flag("-Wl,--build-id=sha1")
# OpenBSD's ld.so can't resolve native TLS relocs in a .so; rely on clang's default
# emulated TLS (don't pass -fno-emulated-tls).
# Allow W+X mappings (JIT) via the PT_OPENBSD_WXNEEDED note; needs a wxallowed mount.

@janvorli janvorli Jun 8, 2026

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Why do we need to enable this? Is W^X broken on OpenBSD?

@am11 am11 Jun 8, 2026

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Short: One or two PAL tests were failing on OpenBSD due to W^X restrictions, so I remounted the /home filesystem with wxallowed and added this linker flag to make them pass.

Long:
This is OpenBSD-specific. Unlike Linux or FreeBSD, OpenBSD enforces W^X strictly and requires both a binary opt-in (-z wxneeded) and a filesystem opt-in (wxallowed) for W+X mappings to be permitted.

The reason for -z wxneeded is that parts of the PAL/JIT may need to create mappings that are temporarily W+X.

With wxneeded, the kernel allows those mappings only when the process is running on a filesystem mounted with wxallowed. If it is not, the mapping request fails at runtime when that code path is reached (i.e., when JIT/codegen tries to allocate executable memory). It does not affect process startup by itself.

So in practice we expect two modes:

  • On systems with wxallowed: app will use W+X mappings when needed.
  • On systems without wxallowed: user will set DOTNET_EnableWriteXorExecute=0, and the app will avoid W+X mappings entirely.

In a follow-up, for systems without wxallowed, we could detect this automatically on OpenBSD using filesystem mount flags, for example:

bool EnableWriteXorExecute(void)
{
    struct statfs buf;
    return statfs(minipal_getexepath(), &buf) == 0 &&
       (buf.f_flags & MNT_WXALLOWED);
}

(I had too many patches in flight and this was getting long, so I skipped doing this right away)

add_linker_flag("-Wl,-z,wxneeded")
# The PAL's hand-written asm lacks endbr64 landing pads, so disable branch-target CFI.
add_linker_flag("-Wl,-z,nobtcfi")
elseif(CLR_CMAKE_HOST_SUNOS)
add_compile_options($<$<COMPILE_LANGUAGE:ASM>:-Wa,--noexecstack>)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstack-protector")
Expand Down Expand Up @@ -847,6 +856,20 @@ else(CLR_CMAKE_TARGET_UNIX)
add_compile_definitions($<$<NOT:$<BOOL:$<TARGET_PROPERTY:IGNORE_DEFAULT_TARGET_OS>>>:TARGET_WINDOWS>)
endif(CLR_CMAKE_TARGET_UNIX)

# OpenBSD only exposes its libunwind symbols through the LLVM C++ runtime
# (libc++/libc++abi), so default to those there. An explicit selection via
# CLR_CMAKE_CXX_STANDARD_LIBRARY/CLR_CMAKE_CXX_ABI_LIBRARY (applied by the cross
# toolchain file) still takes precedence.
if(CLR_CMAKE_TARGET_OPENBSD)
if(NOT CLR_CMAKE_CXX_STANDARD_LIBRARY)
add_compile_options($<$<COMPILE_LANG_AND_ID:CXX,Clang>:--stdlib=libc++>)
add_link_options($<$<LINK_LANG_AND_ID:CXX,Clang>:--stdlib=libc++>)
endif()
if(NOT CLR_CMAKE_CXX_ABI_LIBRARY)
add_link_options("LINKER:-lc++abi")
endif()
endif()

if(CLR_CMAKE_HOST_UNIX_ARM)
if (NOT DEFINED CLR_ARM_FPU_TYPE)
set(CLR_ARM_FPU_TYPE vfpv3)
Expand Down
8 changes: 7 additions & 1 deletion eng/native/functions.cmake
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Expand Up @@ -192,7 +192,13 @@ function(find_unwind_libs UnwindLibs)
find_library(UNWIND NAMES unwind)

if(UNWIND STREQUAL UNWIND-NOTFOUND)
message(FATAL_ERROR "Cannot find libunwind. Try installing libunwind8-dev or libunwind-devel.")
if(CLR_CMAKE_TARGET_OPENBSD)
# On OpenBSD the libunwind symbols are provided by the C++ ABI library
# (libc++abi), so a standalone libunwind is not expected.
set(UNWIND "")
else()
message(FATAL_ERROR "Cannot find libunwind. Try installing libunwind8-dev or libunwind-devel.")
endif()
endif()

set(${UnwindLibs} ${UNWIND_LIBS} ${UNWIND} PARENT_SCOPE)
Expand Down
2 changes: 2 additions & 0 deletions src/coreclr/gc/unix/gcenv.unix.cpp
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Expand Up @@ -1013,11 +1013,13 @@ static size_t GetCurrentVirtualMemorySize()
// non zero if it has succeeded, GetVirtualMemoryMaxAddress() if not available
size_t GCToOSInterface::GetVirtualMemoryLimit()
{
#ifdef RLIMIT_AS
rlimit addressSpaceLimit;
if ((getrlimit(RLIMIT_AS, &addressSpaceLimit) == 0) && (addressSpaceLimit.rlim_cur != RLIM_INFINITY))
{
return addressSpaceLimit.rlim_cur;
}
#endif // RLIMIT_AS

// No virtual memory limit
return GetVirtualMemoryMaxAddress();
Expand Down
10 changes: 10 additions & 0 deletions src/coreclr/hosts/corerun/corerun.hpp
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Expand Up @@ -384,6 +384,16 @@ class platform_specific_actions final
#include <link.h>
#include <elf.h>
#include <cstring>

// glibc defines the ElfW() macro to select the native-width Elf type, but some
// libcs (e.g. OpenBSD) don't provide it. Fall back to the appropriate fixed-width type.
#ifndef ElfW
#if defined(TARGET_64BIT)
#define ElfW(type) Elf64_##type
#else
#define ElfW(type) Elf32_##type
#endif
#endif // ElfW
#endif

// CMake generated
Expand Down
11 changes: 5 additions & 6 deletions src/coreclr/inc/check.h
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@@ -1,9 +1,8 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

// ---------------------------------------------------------------------------
// Check.h
//

//
// Assertion checking infrastructure
// ---------------------------------------------------------------------------
Expand Down Expand Up @@ -663,7 +662,7 @@ CHECK CheckAligned(UINT value, UINT alignment);
CHECK CheckAligned(ULONG value, UINT alignment);
#endif
CHECK CheckAligned(UINT64 value, UINT alignment);
#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
CHECK CheckAligned(SIZE_T value, UINT alignment);
#endif
CHECK CheckAligned(const void *address, UINT alignment);
Expand All @@ -673,7 +672,7 @@ CHECK CheckOverflow(UINT value1, UINT value2);
CHECK CheckOverflow(ULONG value1, ULONG value2);
#endif
CHECK CheckOverflow(UINT64 value1, UINT64 value2);
#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
CHECK CheckOverflow(SIZE_T value1, SIZE_T value2);
#endif
#ifndef __wasm__
Expand All @@ -689,15 +688,15 @@ CHECK CheckUnderflow(UINT value1, UINT value2);
CHECK CheckUnderflow(ULONG value1, ULONG value2);
#endif
CHECK CheckUnderflow(UINT64 value1, UINT64 value2);
#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
CHECK CheckUnderflow(SIZE_T value1, SIZE_T value2);
#endif
CHECK CheckUnderflow(const void *address, UINT offset);
#if defined(_MSC_VER)
CHECK CheckUnderflow(const void *address, ULONG offset);
#endif
CHECK CheckUnderflow(const void *address, UINT64 offset);
#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
CHECK CheckUnderflow(const void *address, SIZE_T offset);
#endif
CHECK CheckUnderflow(const void *address, void *address2);
Expand Down
11 changes: 5 additions & 6 deletions src/coreclr/inc/check.inl
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Expand Up @@ -156,7 +156,7 @@ inline CHECK CheckAligned(UINT64 value, UINT alignment)
CHECK_OK;
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline CHECK CheckAligned(SIZE_T value, UINT alignment)
{
STATIC_CONTRACT_WRAPPER;
Expand Down Expand Up @@ -192,7 +192,7 @@ inline CHECK CheckOverflow(UINT64 value1, UINT64 value2)
CHECK_OK;
}

#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
inline CHECK CheckOverflow(SIZE_T value1, SIZE_T value2)
{
CHECK(value1 + value2 >= value1);
Expand Down Expand Up @@ -237,7 +237,7 @@ inline CHECK CheckOverflow(const void *address, UINT64 offset)
CHECK_OK;
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline CHECK CheckOverflow(const void *address, SIZE_T offset)
{
CHECK((UINT64) address + offset >= (UINT64) address);
Expand Down Expand Up @@ -271,7 +271,7 @@ inline CHECK CheckUnderflow(UINT64 value1, UINT64 value2)
CHECK_OK;
}

#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
inline CHECK CheckUnderflow(SIZE_T value1, SIZE_T value2)
{
CHECK(value1 - value2 <= value1);
Expand Down Expand Up @@ -316,7 +316,7 @@ inline CHECK CheckUnderflow(const void *address, UINT64 offset)
CHECK_OK;
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline CHECK CheckUnderflow(const void *address, SIZE_T offset)
{
// SIZE_T is 32bit on wasm32
Expand Down Expand Up @@ -371,4 +371,3 @@ inline CHECK CheckBounds(const void *rangeBase, UINT32 rangeSize, UINT32 offset,
}

#endif // CHECK_INL_

9 changes: 5 additions & 4 deletions src/coreclr/inc/clrtypes.h
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@@ -1,5 +1,6 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

// ================================================================================
// Standard primitive types for CLR code
//
Expand Down Expand Up @@ -275,7 +276,7 @@ inline UINT64 AlignUp(UINT64 value, UINT alignment)
return (value+alignment-1)&~(UINT64)(alignment-1);
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline SIZE_T AlignUp(SIZE_T value, UINT alignment)
{
STATIC_CONTRACT_LEAF;
Expand Down Expand Up @@ -316,7 +317,7 @@ inline uintptr_t AlignDown(uintptr_t value, UINT alignment)
}
#endif

#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
inline SIZE_T AlignDown(SIZE_T value, UINT alignment)
{
STATIC_CONTRACT_LEAF;
Expand Down Expand Up @@ -345,7 +346,7 @@ inline UINT AlignmentPad(UINT64 value, UINT alignment)
return (UINT) (AlignUp(value, alignment) - value);
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline UINT AlignmentPad(SIZE_T value, UINT alignment)
{
STATIC_CONTRACT_WRAPPER;
Expand Down Expand Up @@ -378,7 +379,7 @@ inline UINT AlignmentTrim(UINT64 value, UINT alignment)
return ((UINT)value)&(alignment-1);
}

#if defined(__APPLE__) || defined(__wasm__)
#if defined(__APPLE__) || defined(__wasm__) || defined(__OpenBSD__)
inline UINT AlignmentTrim(SIZE_T value, UINT alignment)
{
STATIC_CONTRACT_LEAF;
Expand Down
2 changes: 2 additions & 0 deletions src/coreclr/inc/pedecoder.h
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Expand Up @@ -102,6 +102,8 @@ inline CHECK CheckOverflow(RVA value1, COUNT_T value2)
#define IMAGE_FILE_MACHINE_NATIVE_OS_OVERRIDE 0x4644
#elif defined(__FreeBSD__)
#define IMAGE_FILE_MACHINE_NATIVE_OS_OVERRIDE 0xADC4
#elif defined(__OpenBSD__)
#define IMAGE_FILE_MACHINE_NATIVE_OS_OVERRIDE 0xADC5
#elif defined(__linux__)
#define IMAGE_FILE_MACHINE_NATIVE_OS_OVERRIDE 0x7B79
#elif defined(__NetBSD__)
Expand Down
4 changes: 2 additions & 2 deletions src/coreclr/jit/compiler.hpp
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Expand Up @@ -141,12 +141,12 @@ inline unsigned genLog2(uint64_t value)
return BitOperations::BitScanForward(value);
}

#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
inline unsigned genLog2(size_t value)
{
return genLog2((uint64_t)value);
}
#endif // __APPLE__
#endif // __APPLE__ || __OpenBSD__

// Given an unsigned 64-bit value, returns the lower 32-bits in unsigned format
//
Expand Down
4 changes: 2 additions & 2 deletions src/coreclr/jit/jit.h
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Expand Up @@ -731,12 +731,12 @@ inline size_t unsigned_abs(ssize_t x)
return ((size_t)std::abs((int64_t)x));
}

#ifdef __APPLE__
#if defined(__APPLE__) || defined(__OpenBSD__)
inline size_t unsigned_abs(int64_t x)
{
return ((size_t)std::abs(x));
}
#endif // __APPLE__
#endif // __APPLE__ || __OpenBSD__
#endif // TARGET_64BIT

/*****************************************************************************/
Expand Down
4 changes: 3 additions & 1 deletion src/coreclr/minipal/Unix/doublemapping.cpp
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@@ -1,6 +1,5 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
//

#include <stddef.h>
#include <sys/mman.h>
Expand Down Expand Up @@ -102,6 +101,8 @@ bool VMToOSInterface::CreateDoubleMemoryMapper(void** pHandle, size_t *pMaxExecu
// Clip the maximum double mapped memory size to 1/4 of the virtual address space limit.
// When such a limit is set, GC reserves 1/2 of it, so we need to leave something
// for the rest of the process.
#ifdef RLIMIT_AS
// OpenBSD has no address-space rlimit (RLIMIT_AS), so this clipping is skipped there.
struct rlimit virtualAddressSpaceLimit;
if ((getrlimit(RLIMIT_AS, &virtualAddressSpaceLimit) == 0) && (virtualAddressSpaceLimit.rlim_cur != RLIM_INFINITY))
{
Expand All @@ -111,6 +112,7 @@ bool VMToOSInterface::CreateDoubleMemoryMapper(void** pHandle, size_t *pMaxExecu
maxDoubleMappedMemorySize = virtualAddressSpaceLimit.rlim_cur;
}
}
#endif // RLIMIT_AS

// Clip the maximum double mapped memory size to the file size limit
struct rlimit fileSizeLimit;
Expand Down
10 changes: 8 additions & 2 deletions src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.Unix.targets
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Expand Up @@ -21,6 +21,7 @@ The .NET Foundation licenses this file to you under the MIT license.
<CppLibCreator>ar</CppLibCreator>
<_SymbolPrefix Condition="'$(_IsApplePlatform)' == 'true'">_</_SymbolPrefix>
<LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_targetOS)' == 'freebsd'">lld</LinkerFlavor>
<LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_targetOS)' == 'openbsd'">lld</LinkerFlavor>
<LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_linuxLibcFlavor)' == 'bionic'">lld</LinkerFlavor>
<LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_targetOS)' == 'android'">lld</LinkerFlavor>
<LinkerFlavor Condition="'$(LinkerFlavor)' == '' and '$(_targetOS)' == 'linux'">bfd</LinkerFlavor>
Expand Down Expand Up @@ -65,6 +66,7 @@ The .NET Foundation licenses this file to you under the MIT license.
<TargetTriple Condition="'$(CrossCompileArch)' != '' and '$(_IsAlpineExitCode)' != '0'">$(CrossCompileArch)-linux-$(CrossCompileAbi)</TargetTriple>
<TargetTriple Condition="'$(CrossCompileArch)' != '' and '$(_IsAlpineExitCode)' == '0'">$(CrossCompileArch)-alpine-linux-$(CrossCompileAbi)</TargetTriple>
<TargetTriple Condition="'$(CrossCompileArch)' != '' and ($(CrossCompileRid.StartsWith('freebsd')))">$(CrossCompileArch)-unknown-freebsd12</TargetTriple>
<TargetTriple Condition="'$(CrossCompileArch)' != '' and ($(CrossCompileRid.StartsWith('openbsd')))">$(CrossCompileArch)-unknown-openbsd</TargetTriple>

<SharedLibraryInstallName Condition="'$(SharedLibraryInstallName)' == '' and '$(_IsApplePlatform)' == 'true' and '$(NativeLib)' == 'Shared'">@rpath/$(NativeBinaryPrefix)$(TargetName)$(NativeBinaryExt)</SharedLibraryInstallName>

Expand Down Expand Up @@ -222,14 +224,14 @@ The .NET Foundation licenses this file to you under the MIT license.

<ItemGroup>
<NativeSystemLibrary Include="stdc++" Condition="'$(LinkStandardCPlusPlusLibrary)' == 'true'" />
<NativeSystemLibrary Include="dl" />
<NativeSystemLibrary Include="dl" Condition="'$(_targetOS)' != 'openbsd'" />
<NativeSystemLibrary Include="objc" Condition="'$(_IsApplePlatform)' == 'true'" />
<NativeSystemLibrary Include="swiftCore" Condition="'$(_IsApplePlatform)' == 'true'" />
<NativeSystemLibrary Include="swiftFoundation" Condition="'$(_IsApplePlatform)' == 'true'" />
<NativeSystemLibrary Include="z" Condition="'$(UseSystemZlib)' == 'true'" />
<NativeSystemLibrary Include="brotlienc;brotlidec;brotlicommon" Condition="'$(UseSystemBrotli)' == 'true'" />
<NativeSystemLibrary Include="zstd" Condition="'$(UseSystemZstd)' == 'true'" />
<NativeSystemLibrary Include="rt" Condition="'$(_IsApplePlatform)' != 'true' and '$(_linuxLibcFlavor)' != 'bionic'" />
<NativeSystemLibrary Include="rt" Condition="'$(_IsApplePlatform)' != 'true' and '$(_linuxLibcFlavor)' != 'bionic' and '$(_targetOS)' != 'openbsd'" />
<NativeSystemLibrary Include="log" Condition="'$(_linuxLibcFlavor)' == 'bionic'" />
<NativeSystemLibrary Include="icucore" Condition="'$(_IsApplePlatform)' == 'true'" />
<NativeSystemLibrary Include="m" />
Expand Down Expand Up @@ -267,6 +269,10 @@ The .NET Foundation licenses this file to you under the MIT license.
<!-- binskim warning BA3011 The BIND_NOW flag is missing -->
<LinkerArg Include="-Wl,-z,now" Condition="'$(_IsApplePlatform)' != 'true'" Shim="true" />
<LinkerArg Include="-Wl,-z,stack-size=$(IlcDefaultStackSize)" Condition="'$(IlcDefaultStackSize)' != ''" Shim="true" />
<!-- OpenBSD enforces IBT/BTCFI on amd64. NativeAOT codegen is not endbr64-instrumented, so
indirect branches (e.g. switch jump tables) to non-endbr64 targets fault with SIGILL.
Opt out of branch-target CFI enforcement via the PT_OPENBSD_NOBTCFI program header. -->
<LinkerArg Include="-Wl,-z,nobtcfi" Condition="'$(_targetOS)' == 'openbsd'" />
<!-- this workaround can be deleted once the minimum supported glibc version
(runtime's official build machine's glibc version) is at least 2.33
see https://github.com/bminor/glibc/commit/99468ed45f5a58f584bab60364af937eb6f8afda -->
Expand Down
6 changes: 6 additions & 0 deletions src/coreclr/nativeaot/CMakeLists.txt
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Expand Up @@ -28,6 +28,12 @@ if(CLR_CMAKE_TARGET_ANDROID)
set(FEATURE_JAVAMARSHAL 1)
endif()

if(CLR_CMAKE_TARGET_OPENBSD)
# OpenBSD's ld.so cannot resolve native TLS relocations in shared objects and has no
# __tls_get_addr, so the runtime must use emulated TLS (like Android).
add_definitions(-DFEATURE_EMULATED_TLS)
endif()

if(NOT DEFINED FEATURE_JAVAMARSHAL)
set(FEATURE_JAVAMARSHAL $<IF:$<CONFIG:Debug,Checked>,1,0>)
endif()
Expand Down
5 changes: 4 additions & 1 deletion src/coreclr/nativeaot/Runtime/CMakeLists.txt
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Expand Up @@ -288,7 +288,10 @@ if(CLR_CMAKE_TARGET_WIN32)
add_compile_options($<$<COMPILE_LANGUAGE:ASM_MASM>:/safeseh>)
endif()
else()
if(NOT CLR_CMAKE_TARGET_APPLE AND NOT CLR_CMAKE_TARGET_ARCH_WASM)
# OpenBSD marks the main executable's read-only segments immutable (mimmutable) at load,
# so the runtime cannot mprotect the read-only GS cookie page to writable to initialize it.
# Keep the cookie in writable memory there, like Apple.
if(NOT CLR_CMAKE_TARGET_APPLE AND NOT CLR_CMAKE_TARGET_ARCH_WASM AND NOT CLR_CMAKE_TARGET_OPENBSD)
add_definitions(-DFEATURE_READONLY_GS_COOKIE)
endif()
include(unix/configure.cmake)
Expand Down
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