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This looks good. However, if code is compiled/assembled without interworking, then it seams a bit odd that the other instruction set is still permitted.
Thus if the user compiles code with -mcpu=arm7tdmi -mno-thumb-interwork, should the code be marked arm-only (ie permitted thumb use was none)?
Sadly, although gas has -mthumb-interwork, it doesn't have the inverse (-mno-thumb-interwork). That's a bit unfortunate given that the new ABI mandates interworking by default.
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