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Couple of refactorings to make adding dynamic linker support easier #111

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Couple of refactorings to make adding dynamic linker support easier #111

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Commits on Mar 5, 2024

  1. Move the relocate call from init_runtime to entry 

    Self-relocation is not actually initializing runtime state, but making
it possible to safely run any code at all. When using a dynamic linker
the dynamic linker needs to be relocated before it can do dynamic
linking, but some of the runtime intialization needs to happen after
dynamic linking when all static DSO's that use thread local storage are
known.
    @bjorn3
    bjorn3 committed Mar 5, 2024
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  2. Always write thread_id field after initializing thread metadata 

    Also move writing __stack_chk_guard earlier. This makes future
refactorings easier.
    @bjorn3
    bjorn3 committed Mar 5, 2024
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  3. Unify TLS allocation between the main thread and newly spawned threads 

    Also move the TLS for spawned threads away from the stack to simplify
the logic and possibly allow using the regular memory allocator for
allocating the TLS block for all threads other than the main thread.
    @bjorn3
    bjorn3 committed Mar 5, 2024
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