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Support for sh64 was dropped from bfd et al in 2018. Without
that, the sim port is useless. So clean up this code too.
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This helps us break up tconfig.h more. Any file using this define should
be pulling in sim-main.h already, so things should continue working.
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This doesn't appear to have been used since 1998, but wasn't cleaned
up since. So much for being "quick" ;).
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Since every target typedefs this the same way, move it to the common code.
We have to leave Blackfin behind here for now because of inter-dependencies
on types and headers: sim-base.h includes sim-model.h which needs types in
machs.h which needs types in bfim-sim.h which needs SIM_CPU.
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Almost every target defines sim_cia the same way -- either using the
address_word type directly, or a type of equivalent size. The only
odd one out is sh64 (who has 32bit address_word and 64bit cia), and
even that case doesn't seem to make sense. We'll put off clean up
though of sh64 and at least set up a sensible default for everyone.
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The CIA_{GET,SET} macros serve the same function as CPU_PC_{GET,SET}
except the latter adds a layer of indirection via the sim state. This
lets models set up different functions at runtime and doesn't reach so
directly into the arch-specific cpu state.
It also doesn't make sense to have two sets of macros that do exactly
the same thing, so lets standardize on the one that gets us more.
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Now that all the targets are utilizing CPU_PC_{FETCH,STORE}, and the
cpu state is multicore, and the STATE_CPU defines match, we can move
it all to the common code.
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This sets up the sim_state structure and the cpu member to match what we
do in most other sims, and what the common code suggests. This is a step
to unifying on the sim-cpu.o object.
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