libunwind changes needed to run code in sgx environment via rust-sgx. #63
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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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63: Kill some dead code in the control point pass. r=ltratt a=vext01 Co-authored-by: Edd Barrett <vext01@gmail.com>
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Updated branch in response to: #57 (comment)
Please advise on process as this is the first PR against rust-lang's llvm and I tried to follow instructions as close as possible..
Ticket: fortanix/rust-sgx#174
Description: libunwind changes needed to run code in sgx environment via rust-sgx.
Target that uses this in rust: x86_64-fortanix-unknown-sgx.
Rust-lang PR depends on this - plan is to raise it if this PR is accepted.
Without this change, rust std for this toolchain is forced to use a precompiled library loaded via environment variable.
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 when elf is converged to sgx format by 'fortanix-sgx-tools'.
Original ported changes: llvm/llvm-project@release/5.x...fortanix:release/5.x