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m68k arch/cpu directives
- From: Vincent Rivière <vincent dot riviere at freesbee dot fr>
- To: binutils at sourceware dot org
- Date: Mon, 14 Jan 2013 15:06:01 +0100
- Subject: m68k arch/cpu directives
Hello.
I'm a bit puzzled about the various m68k arch/cpu directives in gas.
1) First, I don't really understand the difference between architecture
and cpu. It seems that architecture is a general family, while a cpu is
a precise model.
2) At the top of an assembly file, it seems that both .arch and .cpu are
required to switch to a different CPU than the command line one. Is this
really what is expected? I would have imagined that .cpu was enough, and
that the architecture would have been automatically deduced...
3) Is it allowed to switch to different cpu instruction set at the
middle of an assembly file? This is useful for example to autodetect
special CPU features. It seems that doing so is only supported by the
.chip directive, which is not documented, and present only for ancient
MRI compatibility...
Any hint will be appreciated.
--
Vincent Rivière