Simulate prohibited instructions

[bluele]

No description provided.

[Copilot]

Pull Request Overview

Adds support for simulating and testing prohibited CPU instructions in SGX simulation mode by patching them to UD2 and handling them via a SIGILL handler.

• Introduces test_signal.rs with unit tests for trapping CPUID, SYSCALL, SYSENTER, and INT 0x80 in the enclave simulation.
• Implements a SIGILL handler and instruction counter in the untrusted app to catch and verify UD2 traps.
• Adds simulate module in sgx-urts to patch prohibited instructions in the enclave binary and configures build scripts for sgx_sim mode.

Reviewed Changes

Copilot reviewed 11 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
unit-test/enclave/src/test_signal.rs	Adds simulation-mode trap tests for various CPU instructions
unit-test/enclave/build.rs	Sets SGX_MODE env var and emits cfg(sgx_sim) build flags
unit-test/enclave/src/lib.rs	Registers new signal handler tests in the enclave test runner
unit-test/app/src/main.rs	Installs SIGILL handler, counts UD2 traps, and verifies trap counts
unit-test/app/build.rs	Mirrors SGX_MODE handling for the untrusted app
unit-test/app/Cargo.toml	Adds simulate_utils, libc, tracing, and tracing-subscriber
sgx-urts/src/simulate.rs	Implements patch_enclave_binary and patched enclave creation
sgx-urts/src/lib.rs	Exposes simulate module under feature flag
sgx-urts/Cargo.toml	Adds optional dependencies for simulate_utils feature
samples/hello-rust/app/src/main.rs	Updates debug flag logic to use .unwrap_or_default() == "1"
Makefile	Splits test into enclave-test and untrusted-test targets

[Copilot]

The directive cargo:rustc-check-cfg=cfg(sgx_sim) is not a valid Cargo build-script key. Replace it with println!("cargo:rustc-cfg=sgx_sim"); to correctly enable the sgx_sim cfg flag.

Suggested change

	println!("cargo:rustc-check-cfg=cfg(sgx_sim)");
	println!("cargo:rustc-cfg=sgx_sim");

[Copilot]

The directive cargo:rustc-check-cfg=cfg(sgx_sim) is not recognized by Cargo. It should be println!("cargo:rustc-cfg=sgx_sim"); to actually define the sgx_sim configuration.

Suggested change

	println!("cargo:rustc-check-cfg=cfg(sgx_sim)");
	println!("cargo:rustc-cfg=sgx_sim");