[fpc-devel] arm embedded cortexM3 unrecognized opcode
DrDiettrich1 at aol.com
Tue Jul 13 17:38:24 CEST 2010
Geoffrey Barton schrieb:
> It now recognises the mnemonic 'cpsie' but not the following 'i'.
> The 'msr' instruction should also allow the interrupts to be
> enabled/disabled as
> msr primask,r0
> but msr gives an unknown identifier error for 'primask' and all the
> other 'special' register names ('apsr' etc.) Perhaps they have been
> given different names, but I cannot find them listed anywhere in the FPC
I don't know details about this CPU, but possibly priviledged operations
(and registers) are not part of the CPU definition, because these cannot
be used in ordinary applications.
It may be a good idea to create multiple code generators, for machines
that can be used either for non-priviledged (application) or privileged
(system, driver...) coding. At least a priviledge level should be passed
to the compiler and assembler, so that it can flag the need for
privileged instructions in the given source code.
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