VMW Assembly Simulator Testsuite
This test-suite has a number of tests useful for testing the accuracy of simulators.
It has hello-world programs (source and executables) for a handful of architectures.
I've used the programs within to test m5, qemu, and valgrind.
It can be downloaded here:
Another useful source of test cases is my
LL Simulator Tests. It includes a simple benchmark pre-compiled for
20+ different architectures.