AmForth is doing exactly what it is told to do, looks like the code base is functional, the processor (Cortex-M4/RISCV) is doing what it is supposed to do. It is up to the user to supply the correct information otherwise the processor will complain (exception out).
On Mon, Jan 5, 2026 at 12:27 PM John Sarabacha <[email protected]> wrote: > The other possibility is that it is not a valid address that the processor > can access which could cause an exception > > On Mon, Jan 5, 2026 at 12:18 PM John Sarabacha <[email protected]> > wrote: > >> So when you execute X @ you are trying to indirectly read from the >> address 0xAABBCCDD >> which could cause an exception >> >> On Mon, Jan 5, 2026 at 12:08 PM Martin Kobetic <[email protected]> >> wrote: >> >>> On Mon, Jan 5, 2026 at 11:51 AM John Sarabacha <[email protected]> >>> wrote: >>> >>> > Still learning forth , programmed in many other languages (alot of >>> > assembler) >>> > variable X >>> > $AABBCCDD X ! >>> > X @ >>> > >>> > However tell me if I am wrong, you are creating a variable definition >>> for X >>> > you are setting this variable X to the address $AABBCCDD and then >>> trying to >>> > read a value from this >>> > address on to the tos. >>> >>> >>> Almost. The second line is storing value 0xAABBCCDD at the address >>> represented by variable X. >>> It is the word `variable` in previous line that allocates memory for the >>> variable and associates the corresponding >>> address with a new word `X` that simply pushes that address onto the >>> stack >>> when executed. >>> >>> In the test run I quoted above >>> --- >>> > X >>> ok >>> > .s >>> 5 200002B8 200002C4 200002A8 20000288 8 ok >>> --- >>> The address represented by the variable was 0x200002B8, so it was 8-byte >>> aligned, so should be ok alignment-wise. >>> But your hypothesis with alignment issues seems definitely worth checking >>> out as well. >>> >>> Your warning about the fault interrupts is certainly worth heeding, I >>> don't >>> think we do much there on the ARM side. >>> Another thing to follow up on. >>> >>> _______________________________________________ >>> 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
