[rust] Changes needed for 'x86_64-fortanix-unknown-sgx' nightly target.
Code is guarded via defines to enable only if 'RUST_SGX' is present. Main logic is in libunwind/src/AddressSpace.hpp We use 6 symbols to figure out where eh_frame / eh_frame_hdr is at runtime when loaded in an SGX enclave. (EH symbols + IMAGE base) These are set by 'fortanix-sgx-tools'. As notes: - Target above at the moment uses a pre-compiled libunwind.a from forked repo. - Goal of these changes is to use official llvm with patch. - Changes in rust-lang to use this are planned if/when this is accepted. - Ticket: fortanix/rust-sgx#174 - Original ported changes: llvm/llvm-project@release/5.x...fortanix:release/5.x
This commit is contained in:
parent
76b1dfdd09
commit
9d74699edc
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@ -264,7 +264,7 @@ if (LIBUNWIND_ENABLE_ASSERTIONS)
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# On Release builds cmake automatically defines NDEBUG, so we
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# On Release builds cmake automatically defines NDEBUG, so we
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# explicitly undefine it:
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# explicitly undefine it:
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if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
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if ((NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG") AND (NOT RUST_SGX))
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add_compile_flags(-UNDEBUG)
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add_compile_flags(-UNDEBUG)
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endif()
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endif()
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else()
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else()
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22
libunwind/README_RUST_SGX.md
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22
libunwind/README_RUST_SGX.md
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@ -0,0 +1,22 @@
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# Libunwind customizations for linking with x86_64-fortanix-unknown-sgx Rust target.
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## Description
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### Initial Fork
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Initial Fork has been made from 5.0 release of llvm (commit: 6a075b6de4)
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### Detailed Description
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#### Header files that we do not include for this target
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1. pthread.h
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#### Library that we do not link to for this target.
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1. pthread (Locks used by libunwind is provided by rust stdlib for this target)
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## Building unwind for rust-sgx target
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### Generate Make files:
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* `cd where you want to build libunwind`
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* `mkdir build`
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* `cd build`
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* `cmake -DCMAKE_BUILD_TYPE="RELEASE" -DRUST_SGX=1 -G "Unix Makefiles" -DLLVM_ENABLE_WARNINGS=1 -DLIBUNWIND_ENABLE_PEDANTIC=0 -DLLVM_PATH=<path/to/llvm> <path/to/libunwind>`
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* `"DEBUG"` could be used instead of `"RELEASE"` to enable debug logs of libunwind.
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### Build:
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* `make unwind_static`
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* `build/lib/` will have the built library.
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@ -148,3 +148,8 @@ libunwind specific options
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Path where built libunwind libraries should be installed. If a relative path,
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Path where built libunwind libraries should be installed. If a relative path,
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relative to ``CMAKE_INSTALL_PREFIX``.
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relative to ``CMAKE_INSTALL_PREFIX``.
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.. option:: LIBUNWIND_ENABLE_RUST_SGX:BOOL
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**Default**: ``OFF``
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@ -90,6 +90,7 @@ char *getFuncNameFromTBTable(uintptr_t pc, uint16_t &NameLen,
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// __eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
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// __eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
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// __eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
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// __eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
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#if !defined(RUST_SGX)
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extern char __eh_frame_start;
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extern char __eh_frame_start;
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extern char __eh_frame_end;
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extern char __eh_frame_end;
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@ -98,6 +99,15 @@ extern char __eh_frame_hdr_start;
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extern char __eh_frame_hdr_end;
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extern char __eh_frame_hdr_end;
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#endif
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#endif
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#elif defined(RUST_SGX)
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extern "C" char IMAGE_BASE;
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extern "C" uint64_t EH_FRM_HDR_OFFSET;
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extern "C" uint64_t EH_FRM_HDR_LEN;
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extern "C" uint64_t EH_FRM_OFFSET;
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extern "C" uint64_t EH_FRM_LEN;
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#endif
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#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
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#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
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// When statically linked on bare-metal, the symbols for the EH table are looked
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// When statically linked on bare-metal, the symbols for the EH table are looked
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@ -505,6 +515,10 @@ static int findUnwindSectionsByPhdr(struct dl_phdr_info *pinfo,
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#endif // defined(_LIBUNWIND_USE_DL_ITERATE_PHDR)
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#endif // defined(_LIBUNWIND_USE_DL_ITERATE_PHDR)
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#if defined(RUST_SGX)
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extern "C" char IMAGE_BASE;
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#endif
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inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
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inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
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UnwindInfoSections &info) {
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UnwindInfoSections &info) {
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#ifdef __APPLE__
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#ifdef __APPLE__
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@ -522,6 +536,8 @@ inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
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#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
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#elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) && defined(_LIBUNWIND_IS_BAREMETAL)
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info.dso_base = 0;
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info.dso_base = 0;
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// Bare metal is statically linked, so no need to ask the dynamic loader
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// Bare metal is statically linked, so no need to ask the dynamic loader
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#if !defined(RUST_SGX)
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info.dwarf_section_length = (size_t)(&__eh_frame_end - &__eh_frame_start);
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info.dwarf_section_length = (size_t)(&__eh_frame_end - &__eh_frame_start);
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info.dwarf_section = (uintptr_t)(&__eh_frame_start);
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info.dwarf_section = (uintptr_t)(&__eh_frame_start);
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_LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %p length %p",
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_LIBUNWIND_TRACE_UNWINDING("findUnwindSections: section %p length %p",
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@ -532,6 +548,17 @@ inline bool LocalAddressSpace::findUnwindSections(pint_t targetAddr,
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_LIBUNWIND_TRACE_UNWINDING("findUnwindSections: index section %p length %p",
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_LIBUNWIND_TRACE_UNWINDING("findUnwindSections: index section %p length %p",
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(void *)info.dwarf_index_section, (void *)info.dwarf_index_section_length);
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(void *)info.dwarf_index_section, (void *)info.dwarf_index_section_length);
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#endif
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#endif
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#elif defined(RUST_SGX)
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info.dwarf_section = (uintptr_t)EH_FRM_OFFSET + (uintptr_t)(&IMAGE_BASE);
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info.dwarf_section_length = (uintptr_t)EH_FRM_LEN;
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#if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
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info.dwarf_index_section = (uintptr_t)EH_FRM_HDR_OFFSET + (uintptr_t)(&IMAGE_BASE);
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info.dwarf_index_section_length = (uintptr_t)EH_FRM_HDR_LEN;
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#endif
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#endif
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if (info.dwarf_section_length)
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if (info.dwarf_section_length)
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return true;
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return true;
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#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
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#elif defined(_LIBUNWIND_ARM_EHABI) && defined(_LIBUNWIND_IS_BAREMETAL)
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@ -1,5 +1,9 @@
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# Get sources
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# Get sources
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enable_language(C CXX ASM)
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set(CMAKE_POSITION_INDEPENDENT_CODE ON)
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set(LIBUNWIND_CXX_SOURCES
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set(LIBUNWIND_CXX_SOURCES
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libunwind.cpp
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libunwind.cpp
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Unwind-EHABI.cpp
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Unwind-EHABI.cpp
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@ -22,9 +26,6 @@ set(LIBUNWIND_C_SOURCES
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UnwindLevel1-gcc-ext.c
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UnwindLevel1-gcc-ext.c
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Unwind-sjlj.c
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Unwind-sjlj.c
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)
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)
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set_source_files_properties(${LIBUNWIND_C_SOURCES}
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PROPERTIES
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COMPILE_FLAGS "-std=c99")
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set(LIBUNWIND_ASM_SOURCES
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set(LIBUNWIND_ASM_SOURCES
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UnwindRegistersRestore.S
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UnwindRegistersRestore.S
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@ -73,6 +74,44 @@ if (MSVC_IDE)
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source_group("Header Files" FILES ${LIBUNWIND_HEADERS})
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source_group("Header Files" FILES ${LIBUNWIND_HEADERS})
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endif()
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endif()
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if (RUST_SGX)
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# Compile Flags
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add_definitions(-DRUST_SGX)
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add_definitions(-D__NO_STRING_INLINES)
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add_definitions(-D__NO_MATH_INLINES)
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add_definitions(-D_LIBUNWIND_IS_BAREMETAL)
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# Can't use add_definitions because CMake will reorder these arguments
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list(APPEND LIBUNWIND_COMPILE_FLAGS -U_FORTIFY_SOURCE)
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list(APPEND LIBUNWIND_COMPILE_FLAGS -D_FORTIFY_SOURCE=0)
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list(APPEND LIBUNWIND_COMPILE_FLAGS -fno-stack-protector)
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list(APPEND LIBUNWIND_COMPILE_FLAGS -ffreestanding)
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list(APPEND LIBUNWIND_COMPILE_FLAGS -fexceptions)
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# Avoid too new relocation types being emitted, which might prevent linking
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# on older platforms.
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#
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# See https://github.com/rust-lang/rust/issues/34978
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if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
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list(APPEND LIBUNWIND_COMPILE_FLAGS -Wa,-mrelax-relocations=no)
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else()
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list(APPEND LIBUNWIND_COMPILE_FLAGS)
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endif()
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# Sources
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list(APPEND LIBUNWIND_HEADERS UnwindRustSgx.h)
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list(APPEND LIBUNWIND_C_SOURCES UnwindRustSgx.c)
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endif()
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set_source_files_properties(${LIBUNWIND_C_SOURCES}
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PROPERTIES
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COMPILE_FLAGS "-std=c99")
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# See add_asm_sources() in compiler-rt for explanation of this workaround.
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if((APPLE AND CMAKE_VERSION VERSION_LESS 3.19) OR (MINGW AND CMAKE_VERSION VERSION_LESS 3.17))
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set_source_files_properties(${LIBUNWIND_ASM_SOURCES} PROPERTIES LANGUAGE C)
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endif()
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set(LIBUNWIND_SOURCES
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set(LIBUNWIND_SOURCES
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${LIBUNWIND_CXX_SOURCES}
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${LIBUNWIND_CXX_SOURCES}
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${LIBUNWIND_C_SOURCES}
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${LIBUNWIND_C_SOURCES}
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@ -87,7 +126,7 @@ else()
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add_library_flags_if(LIBUNWIND_HAS_GCC_LIB gcc)
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add_library_flags_if(LIBUNWIND_HAS_GCC_LIB gcc)
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endif()
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endif()
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add_library_flags_if(LIBUNWIND_HAS_DL_LIB dl)
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add_library_flags_if(LIBUNWIND_HAS_DL_LIB dl)
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if (LIBUNWIND_ENABLE_THREADS)
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if (LIBUNWIND_ENABLE_THREADS AND (NOT RUST_SGX))
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add_library_flags_if(LIBUNWIND_HAS_PTHREAD_LIB pthread)
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add_library_flags_if(LIBUNWIND_HAS_PTHREAD_LIB pthread)
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add_compile_flags_if(LIBUNWIND_WEAK_PTHREAD_LIB -DLIBUNWIND_USE_WEAK_PTHREAD=1)
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add_compile_flags_if(LIBUNWIND_WEAK_PTHREAD_LIB -DLIBUNWIND_USE_WEAK_PTHREAD=1)
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endif()
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endif()
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@ -15,7 +15,7 @@
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#if defined(_WIN32)
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#if defined(_WIN32)
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#include <windows.h>
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#include <windows.h>
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#elif !defined(_LIBUNWIND_HAS_NO_THREADS)
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#elif !defined(_LIBUNWIND_HAS_NO_THREADS) && !defined(RUST_SGX)
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#include <pthread.h>
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#include <pthread.h>
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#if defined(__ELF__) && defined(_LIBUNWIND_LINK_PTHREAD_LIB)
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#if defined(__ELF__) && defined(_LIBUNWIND_LINK_PTHREAD_LIB)
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#pragma comment(lib, "pthread")
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#pragma comment(lib, "pthread")
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125
libunwind/src/UnwindRustSgx.c
Normal file
125
libunwind/src/UnwindRustSgx.c
Normal file
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@ -0,0 +1,125 @@
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//===--------------------- UnwindRustSgx.c ----------------------------------===//
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//
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//// The LLVM Compiler Infrastructure
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////
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//// This file is dual licensed under the MIT and the University of Illinois Open
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//// Source Licenses. See LICENSE.TXT for details.
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////
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////
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////===----------------------------------------------------------------------===//
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#define _GNU_SOURCE
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#include <link.h>
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#include <elf.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stddef.h>
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#include "UnwindRustSgx.h"
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#define max_log 256
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__attribute__((weak)) struct _IO_FILE *stderr = (struct _IO_FILE *)-1;
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static int vwrite_err(const char *format, va_list ap)
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{
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int len = 0;
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#ifndef NDEBUG
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char s[max_log];
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s[0]='\0';
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len = vsnprintf(s, max_log, format, ap);
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__rust_print_err((uint8_t *)s, len);
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#endif
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return len;
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}
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static int write_err(const char *format, ...)
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{
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int ret;
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va_list args;
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va_start(args, format);
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ret = vwrite_err(format, args);
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va_end(args);
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||||||
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return ret;
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}
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__attribute__((weak)) int fprintf (FILE *__restrict __stream,
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const char *__restrict __format, ...)
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{
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|
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||||||
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int ret;
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if (__stream != stderr) {
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write_err("Rust SGX Unwind supports only writing to stderr\n");
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return -1;
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||||||
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} else {
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||||||
|
va_list args;
|
||||||
|
ret = 0;
|
||||||
|
va_start(args, __format);
|
||||||
|
ret += vwrite_err(__format, args);
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||||||
|
va_end(args);
|
||||||
|
}
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||||||
|
|
||||||
|
return ret;
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||||||
|
}
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||||||
|
|
||||||
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__attribute__((weak)) int fflush (FILE *__stream)
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||||||
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{
|
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|
// We do not need to do anything here.
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||||||
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return 0;
|
||||||
|
}
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||||||
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|
||||||
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__attribute__((weak)) void __assert_fail(const char * assertion,
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||||||
|
const char * file,
|
||||||
|
unsigned int line,
|
||||||
|
const char * function)
|
||||||
|
{
|
||||||
|
write_err("%s:%d %s %s\n", file, line, function, assertion);
|
||||||
|
abort();
|
||||||
|
}
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||||||
|
|
||||||
|
// We do not report stack over flow detected.
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||||||
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// Calling write_err uses more stack due to the way we have implemented it.
|
||||||
|
// With possible enabling of stack probes, we should not
|
||||||
|
// get into __stack_chk_fail() at all.
|
||||||
|
__attribute__((weak)) void __stack_chk_fail() {
|
||||||
|
abort();
|
||||||
|
}
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||||||
|
|
||||||
|
/*
|
||||||
|
* Below are defined for all executibles compiled for
|
||||||
|
* x86_64-fortanix-unknown-sgx rust target.
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||||||
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* Ref: rust/src/libstd/sys/sgx/abi/entry.S
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||||||
|
*/
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||||||
|
|
||||||
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struct libwu_rs_alloc_meta {
|
||||||
|
size_t alloc_size;
|
||||||
|
// Should we put a signatre guard before ptr for oob access?
|
||||||
|
unsigned char ptr[0];
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||||||
|
};
|
||||||
|
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||||||
|
#define META_FROM_PTR(__PTR) (struct libwu_rs_alloc_meta *) \
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||||||
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((unsigned char *)__PTR - offsetof(struct libwu_rs_alloc_meta, ptr))
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||||||
|
|
||||||
|
void *libuw_malloc(size_t size)
|
||||||
|
{
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||||||
|
struct libwu_rs_alloc_meta *meta;
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||||||
|
size_t alloc_size = size + sizeof(struct libwu_rs_alloc_meta);
|
||||||
|
meta = (void *)__rust_c_alloc(alloc_size, sizeof(size_t));
|
||||||
|
if (!meta) {
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
meta->alloc_size = alloc_size;
|
||||||
|
return (void *)meta->ptr;
|
||||||
|
}
|
||||||
|
|
||||||
|
void libuw_free(void *p)
|
||||||
|
{
|
||||||
|
struct libwu_rs_alloc_meta *meta;
|
||||||
|
if (!p) {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
meta = META_FROM_PTR(p);
|
||||||
|
__rust_c_dealloc((unsigned char *)meta, meta->alloc_size, sizeof(size_t));
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||||||
|
}
|
84
libunwind/src/UnwindRustSgx.h
Normal file
84
libunwind/src/UnwindRustSgx.h
Normal file
|
@ -0,0 +1,84 @@
|
||||||
|
//===--------------------- UnwindRustSgx.h ----------------------------------===//
|
||||||
|
//
|
||||||
|
//// The LLVM Compiler Infrastructure
|
||||||
|
////
|
||||||
|
//// This file is dual licensed under the MIT and the University of Illinois Open
|
||||||
|
//// Source Licenses. See LICENSE.TXT for details.
|
||||||
|
////
|
||||||
|
////
|
||||||
|
////===----------------------------------------------------------------------===//
|
||||||
|
|
||||||
|
#if !defined(UNWIND_RUST_SGX_H)
|
||||||
|
#define UNWIND_RUST_SGX_H
|
||||||
|
|
||||||
|
#ifdef RUST_SGX
|
||||||
|
|
||||||
|
#undef _GNU_SOURCE
|
||||||
|
#define _GNU_SOURCE
|
||||||
|
#include <link.h>
|
||||||
|
#include <stdarg.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
|
||||||
|
// We have to use RWLock from rust repo, it is defined in:
|
||||||
|
// src/libstd/sys/sgx/rwlock.rs.
|
||||||
|
// rwlock.rs has a compile time check to ensure the size and alignment matches
|
||||||
|
// the Rust definition.
|
||||||
|
typedef struct {
|
||||||
|
void *opaque;
|
||||||
|
} RWLock;
|
||||||
|
|
||||||
|
#define RWLOCK_INIT \
|
||||||
|
{ (void *)0 }
|
||||||
|
|
||||||
|
// These are the functions exposed by SGX-Rust.
|
||||||
|
// The rust changes are available at:
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
int __rust_rwlock_rdlock(RWLock *rwlock);
|
||||||
|
int __rust_rwlock_wrlock(RWLock *rwlock);
|
||||||
|
int __rust_rwlock_unlock(RWLock *rwlock);
|
||||||
|
unsigned char *__rust_c_alloc(size_t, size_t);
|
||||||
|
void __rust_c_dealloc(unsigned char *, size_t, size_t);
|
||||||
|
__attribute__((noreturn)) void __rust_abort(void);
|
||||||
|
unsigned char *__rust_encl_address(size_t);
|
||||||
|
|
||||||
|
#ifndef NDEBUG
|
||||||
|
void __rust_print_err(uint8_t *m, int s);
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#define abort __rust_abort
|
||||||
|
|
||||||
|
#undef pthread_rwlock_t
|
||||||
|
#undef pthread_rwlock_rdlock
|
||||||
|
#undef pthread_rwlock_wrlock
|
||||||
|
#undef pthread_rwlock_unlock
|
||||||
|
#undef PTHREAD_RWLOCK_INITIALIZER
|
||||||
|
|
||||||
|
#define pthread_rwlock_t RWLock
|
||||||
|
#define pthread_rwlock_rdlock __rust_rwlock_rdlock
|
||||||
|
#define pthread_rwlock_wrlock __rust_rwlock_wrlock
|
||||||
|
#define pthread_rwlock_unlock __rust_rwlock_unlock
|
||||||
|
#define PTHREAD_RWLOCK_INITIALIZER RWLOCK_INIT
|
||||||
|
|
||||||
|
#define malloc libuw_malloc
|
||||||
|
#define free libuw_free
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
extern "C" {
|
||||||
|
#endif
|
||||||
|
|
||||||
|
void *libuw_malloc(size_t size);
|
||||||
|
void libuw_free(void *p);
|
||||||
|
|
||||||
|
#ifdef __cplusplus
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#endif
|
||||||
|
#endif
|
|
@ -20,6 +20,10 @@
|
||||||
|
|
||||||
#include <__libunwind_config.h>
|
#include <__libunwind_config.h>
|
||||||
|
|
||||||
|
#ifdef RUST_SGX
|
||||||
|
#include "UnwindRustSgx.h"
|
||||||
|
#endif
|
||||||
|
|
||||||
// Platform specific configuration defines.
|
// Platform specific configuration defines.
|
||||||
#ifdef __APPLE__
|
#ifdef __APPLE__
|
||||||
#if defined(FOR_DYLD)
|
#if defined(FOR_DYLD)
|
||||||
|
|
Loading…
Reference in a new issue