New backend

BERTRAND Joël via Gcc-help <[email protected]> Tue, 30 Dec 2025 13:52:09 +0100

Newsgroups	gmane.comp.gcc.help
Message-ID	<[email protected]>

	Hello,

	I'm trying to add a backend for a synthetizable 6809 (6809 with some
improvements. Have a look at
https://63f09.systella.fr/cpu-63f09/article/internal-registers).

	Basically, it's a SoC  written in VHDL that contains several CPU cores,
a shared FPU (or one FPU by core), memory caches and a lot of stuff. CPU
runs at 600 MHz as a regular 6809 (16 bits), 6309 (16 bits with extras
registers) or 63F09 (64 bits data / 32 bits addresses), with or without
double precision FPU.

	I have written a asmb (ftp://newton.systella.fr/a09) that runs as
expected. Today, this CPU can be programmed with a09 in 8/16 or 32 bits
and I would add a backend to gcc.

	I have downloaded gcc-15.2.0 sources and I have read some
documentations to add a m6809 directory in gcc/config. If I have
understood, I have to add a m6809 directory for 8/16 bits code and
another one (63f09 for example) for 32/64 bits code.

	In a first time, I only try to add 8/16 bits code in m6809 directory
you will find in attachment.

	gcc was configured with :
../gcc-15.2.0/configure --prefix=/home/bertrand/cvs/gcc/
--build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=m6809
--program-prefix=m6809-

and build process aborts with :
build/genautomata ../../gcc-15.2.0/gcc/common.md
../../gcc-15.2.0/gcc/config/m6809/m6809.md \
  insn-conditions.md > tmp-automata.cc
genautomata: unit `m6809' is not used
genautomata: unit `m6309' is not used
make[2]: *** [Makefile:2789: s-automata] Error 1
make[2] : on quitte le répertoire
« /home/bertrand/cvs/gcc/build-15.2.0/gcc »
make[1]: *** [Makefile:4712: all-gcc] Error 2
make[1] : on quitte le répertoire « /home/bertrand/cvs/gcc/build-15.2.0 »
make: *** [Makefile:1058: all] Error 2
hilbert:[~/cvs/gcc/build-15.2.0] >

	As it's the first time I'm trying to add a backend, I suppose I have
done a mistake. Help will be welcome.

	JB

m6809.tar.gz (application/gzip, 3.8 KB) - not displayed

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