Hi Daniel,
I've read the PORTING file but it's pretty incomplete in describing the
task. I'm currently stalled trying to figure out how to implement the
Code_Start function in the translation file. For most of the functions I
can see where the translation comes from in the output of compiling
asm_inst.c to assembler, but not for Code_Start -- that seems to depend
on saving and restoring some registers that Prolog is using, so an
equivalent cannot be made by the c compiler.
I am using the powerpc_any.c file as a starting point, as I have powerpc
hardware I can build stuff on and it looks more like a RISC architecture
so more similar to the ARM than x86.
Also I haven't been able to figure out what registers to use on the ARM,
as some are call-clobbered and this seems to cause problems for using
them in assembly language.
Cheers
Jasper
On 12/06/2020 13:35, Daniel Diaz wrote:
Hi Jasper,
Sorry for the late reply,
You can have a look at the PORTING file which gives some information
about adding a new architecture.
The main task is to write a mapper from MiniAssembly to Asm. See
example files in src/Ma2Asm which contains mapper MA->ASM for various
architectures.
The mappers are written in C (it is a good idea to use another mapper
as basis) .Maybe look at the file mips_irix.c file.
I generally look at the asm generated by gcc (using various
optimization flags in order to understand the asm generated, -O0 to -O3).
For this you can look at src/Ma2Asm/FromC. Do a make (modify Makefile
to test with various CFLAGS). It compiles asm_inst.c to asm ; the
study of asm_inst.s gives you hints about the translation of MA
instructions.
Maybe you need to adapt the asm_inst.c file.
Basically it contains C functions whose translation to asm helps you
to write the mapper (the name of C functions are useful to know what
Ma instruction it corresponds).
Don’t hesitate to write me directly if you need more help (by mail to
[email protected]).
Daniel
Le 30 mai 2020 à 16:39, Jasper Taylor <[email protected]
<mailto:[email protected]>> a écrit :
Hi all,
I am thinking about trying to port GNU prolog to the ARM architecture
(linux os). Before I get started, has anyone already had a go at
this, if so, how far did you get and what problems did you encounter?
Thanks for reading
--Jasper
