Thanks Martin, That information saves me a lot of time, what I was also thinking of doing is letting the compiler tell me how to be compatible, this is where ueForth (being in C) can help, for each C word compile with -S and see what the assembly listing looks like and compare this to what the amForth word has and make the adjustments.
Thanks again, John S On Tue, Jan 13, 2026 at 8:52 AM Martin Kobetic <[email protected]> wrote: > Hi John, > That is a sweet looking board. I need to resist the urge to get one too. > I've got plenty that I didn't even use yet :). > > I'm not that well versed in ARM yet, but the errors sound like the > instruction mode > is being switched around for some reason. Maybe we need to ensure somehow > that > it sticks with Thumb? There may also be some issue with interworking, I > haven't quite > wrapped my head around that either. A lot to do still. > > Some interesting references > > https://stackoverflow.com/questions/28669905/what-is-the-difference-between-the-arm-thumb-and-thumb-2-instruction-encodings > > https://developer.arm.com/documentation/dui0203/j/interworking-arm-and-thumb/about-interworking > > Best regards, > Martin > > On Tue, Jan 13, 2026 at 12:40 AM John Sarabacha <[email protected]> > wrote: > > > Hi Martin, > > The Cortex-M7 doesn't like the assembler instructions for arm/words, some > > examples: > > ./words/dup.s:4: Error: Thumb does not support this addressing mode -- > `str > > tos,[psp,#-4]!' > > ./words/nip.s:4: Error: instruction not supported in Thumb16 mode -- > `adds > > psp,#4' > > ./words/abs.s:4: Error: Thumb does not support conditional execution > > ./words/abs.s:5: Error: incorrect condition in IT block -- `b DO_NEXT > > > > Tried different options for the GCC compiler/assembler without success. > > > > FYI > > John S > > > > On Mon, Jan 12, 2026 at 1:13 PM John Sarabacha <[email protected]> > > wrote: > > > > > Hi Martin, > > > Some information on my Cortex-M7 based target platform, Arduino > > > development environment is being is used > > > https://www.pjrc.com/store/teensy41.html > > > > > > Regards, > > > John S > > > > > > On Mon, Jan 12, 2026 at 12:04 PM John Sarabacha <[email protected]> > > > wrote: > > > > > >> Hi Martin, > > >> I will be trying to host amForth on an arm-m7 (600Mhz) platform which > > was > > >> being evaluated a few years ago. I will be using the same process as I > > used > > >> for CH32X033. Any learning I will pass on, M7 is significantly > different > > >> than M4 so by sticking to thumb type instructions there should be some > > >> common issues. > > >> > > >> Regards, > > >> John S > > >> > > > > > > _______________________________________________ > Amforth-devel mailing list for http://amforth.sf.net/ > [email protected] > https://lists.sourceforge.net/lists/listinfo/amforth-devel > _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ [email protected] https://lists.sourceforge.net/lists/listinfo/amforth-devel
