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Fortanix SGX target libunwind build process changes #72937

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merged 3 commits into from
Jun 27, 2020
Merged

Fortanix SGX target libunwind build process changes #72937

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f3b1582
Update libunwind build process for x86_64-fortanix-unknown-sgx target
AdrianCX Jun 23, 2020
343a921
Fix comments
AdrianCX Jun 25, 2020
db6fa2f
Remove deprecated comments
AdrianCX Jun 25, 2020
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20 changes: 0 additions & 20 deletions src/bootstrap/compile.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -131,28 +131,8 @@ fn copy_third_party_objects(
compiler: &Compiler,
target: Interned<String>,
) -> Vec<(PathBuf, DependencyType)> {
let libdir = builder.sysroot_libdir(*compiler, target);
let mut target_deps = vec![];

// Copies libunwind.a compiled to be linked with x86_64-fortanix-unknown-sgx.
//
// This target needs to be linked to Fortanix's port of llvm's libunwind.
// libunwind requires support for rwlock and printing to stderr,
// which is provided by std for this target.
if target == "x86_64-fortanix-unknown-sgx" {
let src_path_env = "X86_FORTANIX_SGX_LIBS";
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Should we issue a warning for some time that this env var is no longer used?

let src =
env::var(src_path_env).unwrap_or_else(|_| panic!("{} not found in env", src_path_env));
copy_and_stamp(
builder,
&*libdir,
Path::new(&src),
"libunwind.a",
&mut target_deps,
DependencyType::Target,
);
}

if builder.config.sanitizers && compiler.stage != 0 {
// The sanitizers are only copied in stage1 or above,
// to avoid creating dependency on LLVM.
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2 changes: 0 additions & 2 deletions src/ci/docker/dist-various-2/Dockerfile
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Expand Up @@ -105,8 +105,6 @@ ENV TARGETS=$TARGETS,nvptx64-nvidia-cuda
ENV TARGETS=$TARGETS,armv7-unknown-linux-gnueabi
ENV TARGETS=$TARGETS,armv7-unknown-linux-musleabi

ENV X86_FORTANIX_SGX_LIBS="/x86_64-fortanix-unknown-sgx/lib/"

# As per https://bugs.launchpad.net/ubuntu/+source/gcc-defaults/+bug/1300211
# we need asm in the search path for gcc-7 (for gnux32) but not in the search path of the
# cross compilers.
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35 changes: 0 additions & 35 deletions src/ci/docker/dist-various-2/build-x86_64-fortanix-unknown-sgx-toolchain.sh
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Expand Up @@ -24,39 +24,4 @@ install_prereq() {
clang-11
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You should also be able to delete these lines:

url="https://github.com/fortanix/llvm-project/archive/${1}.tar.gz"
repo_name="llvm-project"

and

if [ -z "$1" ]; then
    echo "Usage: ${0} <commit_id>"
    exit -1
fi

(and make the corresponding change in the Dockerfile)

}

build_unwind() {
set -x
dir_name="${target}_temp"
rm -rf ${dir_name}
mkdir -p ${dir_name}
pushd ${dir_name}

# Clone Fortanix's fork of llvm-project which has a port of libunwind
fetch_github_commit_archive "$repo_name" "$url"
cd "${repo_name}/libunwind"

# Build libunwind
mkdir -p build
cd build
target_CC="CC_${target//-/_}"
target_CXX="CXX_${target//-/_}"
target_CFLAGS="CFLAGS_${target//-/_}"
target_CXXFLAGS="CXXFLAGS_${target//-/_}"
cmake -DCMAKE_BUILD_TYPE="RELEASE" -DRUST_SGX=1 -G "Unix Makefiles" \
-DCMAKE_C_COMPILER="${!target_CC}" -DCMAKE_CXX_COMPILER="${!target_CXX}" \
-DCMAKE_C_FLAGS="${!target_CFLAGS}" -DCMAKE_CXX_FLAGS="${!target_CXXFLAGS}" \
-DCMAKE_C_COMPILER_TARGET=$target -DCMAKE_CXX_COMPILER_TARGET=$target \
-DLLVM_ENABLE_WARNINGS=1 -DLIBUNWIND_ENABLE_WERROR=1 -DLIBUNWIND_ENABLE_PEDANTIC=0 \
-DLLVM_PATH=../../llvm/ ../
make unwind_static
install -D "lib/libunwind.a" "/${target}/lib/libunwind.a"

popd
rm -rf ${dir_name}

{ set +x; } 2>/dev/null
}

set -x
hide_output install_prereq
build_unwind
6 changes: 4 additions & 2 deletions src/librustc_target/spec/x86_64_fortanix_unknown_sgx.rs
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Expand Up @@ -48,8 +48,10 @@ pub fn target() -> Result<Target, String> {
"ENCLAVE_SIZE",
"CFGDATA_BASE",
"DEBUG",
"EH_FRM_HDR_BASE",
"EH_FRM_HDR_SIZE",
"EH_FRM_HDR_OFFSET",
"EH_FRM_HDR_LEN",
"EH_FRM_OFFSET",
"EH_FRM_LEN",
"TEXT_BASE",
"TEXT_SIZE",
];
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14 changes: 9 additions & 5 deletions src/libstd/sys/sgx/abi/entry.S
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Expand Up @@ -11,7 +11,7 @@ IMAGE_BASE:
.long 1 /* type = NT_VERSION */
0: .asciz "toolchain-version" /* name */
1: .align 4
2: .long 0 /* desc - toolchain version number, 32-bit LE */
2: .long 1 /* desc - toolchain version number, 32-bit LE */
3: .align 4

.section .rodata
Expand Down Expand Up @@ -60,10 +60,14 @@ IMAGE_BASE:
globvar TEXT_BASE 8
/* The size in bytes of enclacve text section */
globvar TEXT_SIZE 8
/* The base address (relative to enclave start) of the enclave EH_FRM_HDR section */
globvar EH_FRM_HDR_BASE 8
/* The size in bytes of enclacve EH_FRM_HDR section */
globvar EH_FRM_HDR_SIZE 8
/* The base address (relative to enclave start) of the enclave .eh_frame_hdr section */
globvar EH_FRM_HDR_OFFSET 8
/* The size in bytes of enclave .eh_frame_hdr section */
globvar EH_FRM_HDR_LEN 8
/* The base address (relative to enclave start) of the enclave .eh_frame section */
globvar EH_FRM_OFFSET 8
/* The size in bytes of enclacve .eh_frame section */
globvar EH_FRM_LEN 8

.org .Lxsave_clear+512
.Lxsave_header:
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36 changes: 36 additions & 0 deletions src/libunwind/build.rs
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Expand Up @@ -9,6 +9,8 @@ fn main() {
{
// Build the unwinding from libunwind C/C++ source code.
llvm_libunwind::compile();
} else if target.contains("x86_64-fortanix-unknown-sgx") {
llvm_libunwind::compile();
} else if target.contains("linux") {
if target.contains("musl") {
// linking for musl is handled in lib.rs
Expand Down Expand Up @@ -55,6 +57,7 @@ mod llvm_libunwind {

/// Compile the libunwind C/C++ source code.
pub fn compile() {
let target = env::var("TARGET").expect("TARGET was not set");
let target_env = env::var("CARGO_CFG_TARGET_ENV").unwrap();
let target_vendor = env::var("CARGO_CFG_TARGET_VENDOR").unwrap();
let target_endian_little = env::var("CARGO_CFG_TARGET_ENDIAN").unwrap() != "big";
Expand All @@ -75,6 +78,35 @@ mod llvm_libunwind {
cfg.flag("/EHsc");
cfg.define("_CRT_SECURE_NO_WARNINGS", None);
cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
} else if target.contains("x86_64-fortanix-unknown-sgx") {
cfg.cpp(false);

cfg.static_flag(true);
cfg.opt_level(3);

cfg.flag("-nostdinc++");
cfg.flag("-fno-exceptions");
cfg.flag("-fno-rtti");
cfg.flag("-fstrict-aliasing");
cfg.flag("-funwind-tables");
cfg.flag("-fvisibility=hidden");
cfg.flag("-fno-stack-protector");
cfg.flag("-ffreestanding");
cfg.flag("-fexceptions");

// easiest way to undefine since no API available in cc::Build to undefine
cfg.flag("-U_FORTIFY_SOURCE");
cfg.define("_FORTIFY_SOURCE", "0");

cfg.flag_if_supported("-fvisibility-global-new-delete-hidden");

cfg.define("_LIBUNWIND_DISABLE_VISIBILITY_ANNOTATIONS", None);
cfg.define("RUST_SGX", "1");
cfg.define("__NO_STRING_INLINES", None);
cfg.define("__NO_MATH_INLINES", None);
cfg.define("_LIBUNWIND_IS_BAREMETAL", None);
cfg.define("__LIBUNWIND_IS_NATIVE_ONLY", None);
cfg.define("NDEBUG", None);
} else {
cfg.flag("-std=c99");
cfg.flag("-std=c++11");
Expand Down Expand Up @@ -103,6 +135,10 @@ mod llvm_libunwind {
unwind_sources.push("Unwind_AppleExtras.cpp");
}

if target.contains("x86_64-fortanix-unknown-sgx") {
unwind_sources.push("UnwindRustSgx.c");
}

let root = Path::new("../llvm-project/libunwind");
cfg.include(root.join("include"));
for src in unwind_sources {
Expand Down