Nathaniel pointed out that __vdso_sgx_enter_enclave() is tantalizingly close to being callable from C (with caveats and a cooperative enclave). The missing pieces are preserving %rbx and taking @leaf as a standard parameter. v2: - Rebase to Jarkko's latest master, commit 402fb35a477a, "docs: ...") - Add CFI directive for RBX. [Cedric] v1: - https://patchwork.kernel.org/cover/11446355/ Sean Christopherson (5): x86/sgx: vdso: Make __vdso_sgx_enter_enclave() callable from C code x86/sgx: vdso: Define a typedef for __vdso_sgx_enter_enclave selftests/sgx: Pass EENTER to vDSO wrapper instead of hardcoding selftests/sgx: Stop clobbering non-volatile registers selftests/sgx: Add selftest to invoke __vsgx_enter_enclave() from C arch/x86/entry/vdso/vsgx_enter_enclave.S | 64 ++----------------- arch/x86/include/uapi/asm/sgx.h | 61 ++++++++++++++++++ tools/testing/selftests/sgx/call.S | 1 - tools/testing/selftests/sgx/defines.h | 1 + tools/testing/selftests/sgx/main.c | 20 ++++-- tools/testing/selftests/sgx/main.h | 2 +- .../selftests/sgx/test_encl_bootstrap.S | 6 +- 7 files changed, 84 insertions(+), 71 deletions(-) -- 2.24.1
