n64/n32 - build support patches

[M. Warner Losh]

In message: <98a59be81003050823r57b5dc4alfc58018ffbb74731 at mail.gmail.com>
            "C. Jayachandran" <c.jayachandran at gmail.com> writes:
: On Fri, Mar 5, 2010 at 8:49 PM, M. Warner Losh <imp at bsdimp.com> wrote:
: > CJ,
: >
: > Thanks for all the work in this area.  I know that Julie Mallett is
: > also working in this area, and I've done some work to clean up the
: > build system.  I'm afraid that we now have some conflicts between the
: > different efforts, and that it may take a little to resolve the
: > conflicts.
: 
: This is okay, I can rebase the patch when the other efforts are in,
: (or can merge other efforts after this goes in).  I need a base on
: which to start work on n64/n32 and I'm making my changes available as
: it may be useful for others working in the same area.

Excellent.  And your patches often fill in holes that others haven't
gotten to yet.  I think between everybody working in this area, we'll
have a really good solution to the problem.

BTW, have you given any thought to multilib yet? :)

Warner

: Regards,
: JC.
: 
: 
: > In message: <98a59be81003050215m753799dbu35d2b2eab65e75db at mail.gmail.com>
: >            "C. Jayachandran" <c.jayachandran at gmail.com> writes:
: > : I've updated the patches for building n64 and n32 kernel and
: > : userspace,  please review. The patches are:
: > :
: > : Tool chain support for n64 and n32::
: > : http://sites.google.com/site/cjayachandran/files/n64-n32-toolchain.patch
: >
: > : This updates the gcc configuration  to provide the default ABI, linker
: > : scripts and endianness flags during n64/n32 and o32 builds. With this
: > : change, we don't need the -Wl, flags for linker emulation, the mabi
: > : flags or the -EB/-EL for compiler.
: >
: > This part of the patch looks good.
: >
: > : I had to add a make variable in TARGET_DEFINES in
: > : gnu/usr.bin/cc/Makefile.tgt and use that to pass the defaults while
: > : creating 'tm.h' - this change is not MIPS-specific.
: >
: > TARGET_DEFINES is OK.  I'm not sure about the other Makefile variables
: > and would like to find some way to not need them.
: >
: > : User/kernel build with n64 and n32:
: > : http://sites.google.com/site/cjayachandran/files/n64-n32-build.patch
: > :
: > : updated bsd.cpu.mk which does not set LDFLAGS, adds ldscript.mips.n32
: > : and removes unnecessary flags from Makefile.mips.
: >
: > +.if ${MACHINE_ARCH} == "mips"
: > +. if defined(TARGET_64BIT)
: > +.  if defined(TARGET_BIG_ENDIAN)
: > +LD += -melf64btsmip_fbsd
: > +.  else
: > +LD +=  -melf64ltsmip_fbsd
: > +.  endif
: > +. elif defined(TARGET_N32)
: > +.  if defined(TARGET_BIG_ENDIAN)
: > +LD += -melf32btsmipn32_fbsd
: > +.  else
: > +LD +=  -melf32ltsmipn32_fbsd
: > +.  endif
: >
: > I'd rather find some way to avoid adding TARGET_64BIT, TARGET_N32.
: > I've been working to eliminate TARGET_BIG_ENDIAN because it is proving
: > to be unworkable in practice, especially as these machines become more
: > self-hosting.
: >
: > If you don't mind, I'll pull in the parts that don't conflict with the
: > other work in this area, and we can then look at the harder problem of
: > which pieces of that goes in.
: >
: > Warner
: >
: 
: 
: 
: -- 
: C. Jayachandran    c.jayachandran at gmail.com
: 
: