OPENRISC toolchain for FREEBSD

by Unknown 23:17 0 comments

I am writing this blog for my own reference. I am novice to open source development and this is a learning process for me. My documentation   may be wrong/stupid/complete BS. If u find any mistakes, pls post it. I will correct it.
I dont know whether I will complete this or not. Lets see.....


Found this  project on Freebsd ideas page.  This involves porting Freebsd to openrisc platform. First step is to build toolchain for Freebsd.

This document explains how to add a new OS to GNU toolchain
http://wiki.osdev.org/OS_Specific_Toolchain#Binutils

This page contains details on OPENRISC toolchain building steps
http://openrisc.net/toolchain-build.html

Building Binutils:
             I got the source from github and started building binutils which is the first step

1. No need to edit config.sub since Freebsd is already added

2. Next bfd/config.bfd says there is no support for this TARGET
    So I edited the file and added the following lines after or1k-linux

or1k-*-elf | or1k-*-freebsd*)
    targ_defvec=bfd_elf32_or1k_vec
    ;;

  or1knd-*-elf | or1knd-*-freebsd*)
    targ_defvec=bfd_elf32_or1k_vec
    ;;

3. ran configure and got the error that some file in doc folder (binutils.tex)is missing
    found the solution to run with "--enable-maintainer-mode" option in configure script

4. configure succeeded

5. Now running make command

6. make failed with following error

configure.in:21: error: Please use exactly Autoconf 2.64 instead of 2.69.
../config/override.m4:12: _GCC_AUTOCONF_VERSION_CHECK is expanded from...
configure.in:21: the top level

to fix this i edited override.m4 file and change version 2.64 to 2.69

7. struck at Makefile.am (bfdver.h): Substitute report_bugs_to.  Also
 create doc/bfdver.texi. in make

apparently there is rule to create this file in Makefile.am. Unfortunately it is not run.

8. found that it is enough to run configure script in the src directory directly.

9. ran ./configure --target=or1k-freebsd

it completed

the make failed ld

10. adding the option to ld

added this, line ld/configure.tgt

or1k-*-freebsd* | or1knd-*-freebsd*)        targ_emul=elf32or1k ;;

other bsd targets had _fbsd extension. It throwed some error when configured like that.

so leaving as elf as used by rtems. need to revisit

11. ld compiled and faced error with libiberty apparrently lacking -fPIC flag.

Error is relocation R_X86_64_32S against `ro_data' can not be used when making a 

shared object; recompile with -fPIC

to fix this I manually added -fPIC to PICFLAG if libiberty/Makefile.

libiberty is newly created in pic directory

after this I manually executed "make command" that  created the binaries

12. Then running make, continued for some time

13 Now struck at 

relocation R_X86_64_32S against `_sch_istable' 

can not be used when making a shared object; recompile with -fPIC

Its 1 AM in the night. I will carry on tomo 

14. I recompiled with -fPIC. Added it in the makefile.am

15. After that struck at, or1ksim.h not found. Apparently you need to build the simulator 

library (-lsim) before building toolchain. I did not do this. If you compile or1ksim,

you will get this file and -lsim library. 

source is found at https://github.com/openrisc/or1ksim 

16. after building or1ksim, build succeeded. But it is not linked properly and got undefined

      reference errors  (or1ksim_init). to fix this I added the installed library path to 

     makefile. Make clean is needed. Lets see hwo it goes

17. You need to install or1ksim in this specific directory otherwise gdb compilation failed

     "/opt/or1ksim". this can be done when u give configure just add the prefix to 

      this directory

18. After this too gdb failed. Apparently because -lsim is not included.

    To fix this, I edit the make file to include -lsim later 

19. After this compiling rda directory failed saying c compiler not working. This seems

to be because it expects gcc for freebsd already exists. I copied the rda directory to 

or1k-freebsd directory and ran the following commands

cd or1k-freebsd/rda/
 1584  ./configure --prefix=$PREFIX --target=$TARGET
 1585  make
 1586  make install
 

20. after this make succeeded

21. make install installed binaries on the path specified by PREFIX

next step is to compile GCC 

GCC compilation steps

1. Follow the osdev wiki on adding new target os to add the required platform

in specific files. ex, edit gcc/config.gcc and libgcc/config.guess and add your platform

2. Apparently you need to give freebsd9 or freebsd10 while mentioning target because this 

is must or else build will fail complaining that "FBSD_MAJOR" is not define

3. It is better to follow linux implementation and add whatever is needed

4. Now it says SYSROOT directory is not present
I mkdir the directory, after this build proceeded.

5. Now it says freebsd-unwind.h is not present 

   This error came because I added "md_unwind_header" to or1k-freebsd target.

   This is not needed and default "no-unwind.h" will be used

6. Now fatal error: sys/_types.h: No such file or directory
 error is seen