libtasn1 for Unikraft

This is the port of libtasn1 4.16.0 for Unikraft as external library.

libtasn1 depends on libc(e.g. newlib), so please ensure you add the following line to the LIBS variable in the Makefile:

...$(UK_LIBS)/libtasn1:$(UK_LIBS)/newlib...

Using the root filesystem

We will use the 9pfs support for filesystems. To enable it, you'll need to select the following menu options, all under "Library Configuration":

• vfscore: VFS Core Interface
• Automatically mount a root filesysytem (/) from vfscore: Configuration
• 9PFS for Default root filesystem from vfscore: Configuration
• devfs: devfs file system
• Mount /dev during boot from devfs: devfs file system

With the 9pfs support enabled, all you have to do is to provide the right Qemu parameters in order for Unikraft to mount the filesystem:

-fsdev local,id=myid,path=<some directory>,security_model=none \
-device virtio-9p-pci,fsdev=myid,mount_tag=rootfs,disable-modern=on,disable-legacy=off

Running libtasn1 test suite

For running the test cases: enable the Build test suite option in the configuration menu, include test_suite_glue.h and call the libtasn1_test_main(int verbose) function in your main application. Also, please ensure that the Default root filesystem from Library Configuration->vfscore: Configuration is set to 9PFS and use the path of the tests folder (i.e. build/libtasn1/origin/libtasn1-4.16.0/tests).

Further information

Please refer to the README.md as well as the documentation in the doc/ subdirectory of the main unikraft repository.