When `src = dst` and `imm = 0x80000000` in ISUB_R, the JIT generated the wrong code because negating 0x80000000 (-2^31) resulted in -2^31 again, not +2^31.
Also added the test to `tests.cpp` to check this case (can be verified by disabling the fix in jit_compiler_a64/jit_compiler_rv64).
(cherry picked from commit 3babb8767e83da6154bec43037f3b9f947c5e200)
1. Disable hugepages (not supported).
2. Force W^X (required).
3. When allocating JIT memory, PROT_EXEC must be reserved
in order to set the pages executable later.
Since OpenBSD 6.0 W^X is enforced.
Added `RANDOMX_FLAG_SECURE` in tests and benchmarks.
Updated comment.
Excluded `cpu_set_t` since it is not defined on OpenBSD.
* instruction decode/execute separated into class BytecodeMachine
* added randomx-tests project
* removed the use of non-portable __COUNTER__ macro
* removed the use of unsupported FENV_ACCESS pragma
SChernykhandsuch-gitea