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ZTS PHP binaries have only small size of the PT_TLS segment as a whole, like 0x13c bytes. This means that we can search the offset of the actual _tsrm_ls_cache without resolving the symbol by brute forcing the PT_TLS segment. By examining each candidate of the offset by actually trying to resolve EG and see the value of uninitialized_zval and error_zval, and also trying to resolve a global constant like PHP_VERSION, we can assume the candidate is really the offset of _tsrm_ls_cache.
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This resolves #450 .
Completely WIP, but the POC now works.