• David Crawshaw's avatar
    cmd/go, cmd/ld, runtime, os/user: TLS emulation for android · 12b990ba
    David Crawshaw authored
    Based on cl/69170045 by Elias Naur.
    
    There are currently several schemes for acquiring a TLS
    slot to save the g register. None of them appear to work
    for android. The closest are linux and darwin.
    
    Linux uses a linker TLS relocation. This is not supported
    by the android linker.
    
    Darwin uses a fixed offset, and calls pthread_key_create
    until it gets the slot it wants. As the runtime loads
    late in the android process lifecycle, after an
    arbitrary number of other libraries, we cannot rely on
    any particular slot being available.
    
    So we call pthread_key_create, take the first slot we are
    given, and put it in runtime.tlsg, which we turn into a
    regular variable in cmd/ld.
    
    Makes android/arm cgo binaries work.
    
    LGTM=minux
    R=elias.naur, minux, dave, josharian
    CC=golang-codereviews
    https://golang.org/cl/106380043
    12b990ba
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