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Add documentation on testing Mbed TLS using QEMU syscall emulation

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker 2020-09-07 13:51:40 +01:00
parent 15062fabef
commit e680037ef7
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34
docs/architecture/testing/test-framework.md
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@ -56,3 +56,37 @@ The outcome file has 6 fields:
* **Test case**: the description of the test case.
* **Result**: one of `PASS`, `SKIP` or `FAIL`.
* **Cause**: more information explaining the result.
## Testing with different architectures
This section describes ways to test Mbed TLS if the target architecture is different from the architecture on the host.
### QEMU syscall emulation
QEMU supports syscall emulation, which combines instruction emulation with forwarding of Linux system calls to the host
system to allow you to run cross-compiled Linux binaries as if they were native to the host. Moreover, emulation happens
automatically if available, so that no changes to the command line are necessary.
This implies that all test suites, test programs and test scripts can be invoked for cross-builds of Mbed TLS, provide
an appropriate version of QEMU supporting syscall emulation for the target architecture is installed.
#### Example: ARM-v8A AES Crypto Extensions
This example explains how to test Mbed TLS' support for the ARM-v8A Cryptography Extensions using cross-compilation and
QEMU syscall emulation.
First, cross-compile Mbed TLS for ARM-v8A + Cryptography Extensions, e.g.:
```
export CC='aarch64-linux-gnu-gcc'
export CFLAGS='-Ofast -march=armv8-a+crypto'
export LDFLAGS='-static'
./scripts/config.pl set MBEDTLS_ARMV8CE_AES_C
make -j$(nproc)
```
Next, test programs and scripts can be run as if they were compiled for the host architecture, e.g.:
```
make test
```