Hi,

I'm debuging or1ksim using GDB/DDD, but it's very curious that sometimes the source line can not match the GDB execution line.

What I want to know is that whether or1ksim is compiled with some optimization flags which possibly yields some lines of code optimized?

I configured or1ksim with target or32-elf and a prefix, no source files changed.

Thanks,
Brian

Hi Brian,

Simple answer. Yes.

If you want to debug Or1ksim, build a version without optimization. It will run slower, but you will get more accurate line numbers, fewer values optimized away etc.

make CFLAGS+="-O0"

should do the trick (don't forget to "make clean" if you have a build already complete).

HTH

Jeremy

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Thanks very much for your reply, Jeremy.

Brian

Hi Jeremy,

I'm compiling or1ksim as your said, but it reports the following error. Can you help?

I've tried that when I use "make" instead of "make CFLAGS+=-O0" compilation will pass.

libtool: link: ranlib .libs/libsim.a
libtool: link: rm -fr .libs/libsim.lax
libtool: link: ( cd ".libs" && rm -f "libsim.la" && ln -s "../libsim.la" "libsim.la" )
gcc -DHAVE_CONFIG_H -I. -I.. -I./cpu/or32 -I.. -I../cpu/common -I../cpu/or1k -I../cache -I../mmu -I../bpb -I../peripheral -I../tick -I../peripheral/channels -I../pm -I../pic -I../debug -I../vapi -I../support -I../cuc -I../port -I../argtable2 -I../softfloat -I../pcu -O0 -MT toplevel.o -MD -MP -MF .deps/toplevel.Tpo -c -o toplevel.o ../toplevel.c
mv -f .deps/toplevel.Tpo .deps/toplevel.Po
/bin/sh ./libtool --tag=CC --mode=link gcc -O0 -o sim toplevel.o libor1ksys.la
libtool: link: gcc -O0 -o sim toplevel.o ./.libs/libor1ksys.a -lm
./.libs/libor1ksys.a(softfloat.o): In function `estimateDiv128To64':
softfloat.c:(.text+0x86): undefined reference to `mul64To128'
softfloat.c:(.text+0xb2): undefined reference to `sub128'
softfloat.c:(.text+0xfa): undefined reference to `add128'
./.libs/libor1ksys.a(softfloat.o): In function `roundAndPackFloat32':
softfloat.c:(.text+0x9da): undefined reference to `packFloat32'
softfloat.c:(.text+0xa44): undefined reference to `shift32RightJamming'

Hi Brian,

The problem is the third party softfloat package. I see there is guidance in its README file:

Note that the code cannot be compiled with -O0 for debugging purpose, because of the approach used to code inlining. Additional macros have been added to ease this problem. For debugging purposes, Or1ksim should be configured adding CFLAGS="-O0 -DINLINE=static -DNO_SOFTFLOAT_UNUSED" to the configure line.

Rather embarrassingly, I see that warning was written by me only last year :(

Hopefully you can now get on with building Or1ksim unoptimized.

Jeremy

Thanks Jeremy, it works now. I've added to this wiki link:

http://opencores.org/or1k/Or1ksim#Installation_under_Linux.2FCygwin

Best Regards,
Brian

Hi Brian,

Thanks for contributing to the Wiki. That helps everyone in future.

Hope your work is successful. We'll be very interested in any improvements that you can add to Or1ksim.

Jeremy