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README-m32.md

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0. Setup

To configure the build processes for 32-bit, export the M32 variable as follows. Note that this variable should also be set in order to build 32-bit versions of the applications in app/.

export M32=1

1. Apply the patches to the SGX-SDK:

./patch_sdk.sh

While the Linux SGX-SDK is equipped to produce a 32-bit SDK installation package, there are some small errors and warnings that need to be suppressed for it to build. An extra SDK patch fixes these.

2. Build the SGX-SDK installation package

32-bit enclaves require a 32-bit SDK to function. The requirements to build are the same as described in the linux-sgx repository, but should be adapted to 32-bit:

Unless already installed, you will need to install gcc-multilib as well as g++-multilib:

sudo apt install gcc-multilib g++-multilib

You will also need 32-bit versions of the required libraries mentioned in the linux-sgx repo:

sudo apt install libssl-dev:i386 libcurl4-openssl-dev:i386 protobuf-compiler:i386 libprotobuf-dev:i386

You can then build the SGX-SDK install package with:

cd linux-sgx
make sdk_install_pkg ARCH=x86

3. Install the SGX-SDK installation package

The location of the installer will be shown at the end of the compilation in the previous step.

Install the SDK to some location that is preferably not /opt/intel

4. Install the PSW package

Download and install the unmodified 64-bit PSW installation package. If you have the newest PSW installed already, there is no need to modify your installation.

5. Build libsgx_urts.so and libsgx_uae_service.so

The build requirements are the same as for the 32-bit SDK. We will not be building a full psw install package, we just need the two mentioned libraries.

cd psw/urts/linux
make all ARCH=x86

When the build finishes, the required libraries are in the following directories:

psw/urts/linux/libsgx_urts.so
psw/uae_service/linux/libsgx_uae_service.so

To make sure the linker finds the libraries when compiling the applications in app/, move the uae_service library to the urts library location:

cd ../../../ 
mv psw/uae_service/linux/libsgx_uae_service.so psw/urts/linux

If your SDK installation path was not /opt/intel, then the makefiles for the sgx-step apps will find the libraries automatically. Otherwise, you can either move the libraries to /usr/lib, or set up your environment variables to point to a directory containing the libraries.