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[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
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,22 @@ | ||
| # Libunwind customizations for linking with x86_64-fortanix-unknown-sgx Rust target. | ||
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| ## Description | ||
| ### Initial Fork | ||
| Initial Fork has been made from 5.0 release of llvm (commit: 6a075b6de4) | ||
| ### Detailed Description | ||
| #### Header files that we do not include for this target | ||
| 1. pthread.h | ||
| #### Library that we do not link to for this target. | ||
| 1. pthread (Locks used by libunwind is provided by rust stdlib for this target) | ||
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| ## Building unwind for rust-sgx target | ||
| ### Generate Make files: | ||
| * `cd where you want to build libunwind` | ||
| * `mkdir build` | ||
| * `cd build` | ||
| * `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>` | ||
| * `"DEBUG"` could be used instead of `"RELEASE"` to enable debug logs of libunwind. | ||
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| ### Build: | ||
| * `make unwind_static` | ||
| * `build/lib/` will have the built library. |
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| //===--------------------- UnwindRustSgx.c ----------------------------------===// | ||
| // | ||
| //// 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. | ||
| //// | ||
| //// | ||
| ////===----------------------------------------------------------------------===// | ||
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| #define _GNU_SOURCE | ||
| #include <link.h> | ||
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| #include <elf.h> | ||
| #include <stdarg.h> | ||
| #include <stdio.h> | ||
| #include <stddef.h> | ||
| #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) | ||
| { | ||
| int len = 0; | ||
| #ifndef NDEBUG | ||
| char s[max_log]; | ||
| s[0]='\0'; | ||
| len = vsnprintf(s, max_log, format, ap); | ||
| __rust_print_err((uint8_t *)s, len); | ||
| #endif | ||
| return len; | ||
| } | ||
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| static int write_err(const char *format, ...) | ||
| { | ||
| int ret; | ||
| va_list args; | ||
| va_start(args, format); | ||
| ret = vwrite_err(format, args); | ||
| va_end(args); | ||
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| return ret; | ||
| } | ||
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| __attribute__((weak)) int fprintf (FILE *__restrict __stream, | ||
| const char *__restrict __format, ...) | ||
| { | ||
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| int ret; | ||
| if (__stream != stderr) { | ||
| write_err("Rust SGX Unwind supports only writing to stderr\n"); | ||
| return -1; | ||
| } else { | ||
| va_list args; | ||
| ret = 0; | ||
| va_start(args, __format); | ||
| ret += vwrite_err(__format, args); | ||
| va_end(args); | ||
| } | ||
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| return ret; | ||
| } | ||
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| __attribute__((weak)) int fflush (FILE *__stream) | ||
| { | ||
| // We do not need to do anything here. | ||
| return 0; | ||
| } | ||
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| __attribute__((weak)) void __assert_fail(const char * assertion, | ||
| 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. | ||
| // 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. | ||
| * Ref: rust/src/libstd/sys/sgx/abi/entry.S | ||
| */ | ||
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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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| #define META_FROM_PTR(__PTR) (struct libwu_rs_alloc_meta *) \ | ||
| ((unsigned char *)__PTR - offsetof(struct libwu_rs_alloc_meta, ptr)) | ||
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| void *libuw_malloc(size_t size) | ||
| { | ||
| struct libwu_rs_alloc_meta *meta; | ||
| 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; | ||
| } | ||
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| 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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