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libunwind changes needed to run code in sgx environment via rust-sgx. #57

Merged
merged 1 commit into from
Jun 2, 2020
Merged

libunwind changes needed to run code in sgx environment via rust-sgx. #57

merged 1 commit into from
Jun 2, 2020

Commits on May 26, 2020

  1. 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
    @AdrianCX
    AdrianCX committed May 26, 2020
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