n32 support patches

[M. Warner Losh]

In message: <dffe84831003012043n119d5809s2e300e4b8bc35a35 at mail.gmail.com>
            Neel Natu <neelnatu at gmail.com> writes:
: The changes to bsd.cpu.mk that append to LDFLAGS will most likely
: break building kernel modules. Can you build a kernel module in a tree
: with your patch?

Chances are all of those will go away anyway :)  But I haven't thought
about ABI changes in my TBEMD tree....

: The problem is that LDFLAGS are directly passed as arguments to the
: linker in bsd.kmod.mk and the linker does not like the
: -Wl,-linker_option style of setting options.
: 
: Do you really need to set LDFLAGS in bsd.cpu.mk? It would seem that
: simply setting LD would work.

But in the current world order, I have the same questions...

Warner


: best
: Neel
: 
: On Mon, Mar 1, 2010 at 6:28 AM, C. Jayachandran
: <c.jayachandran at gmail.com> wrote:
: > I'm in the process of getting n32 ABI support for the RMI processors.
: > The plan is have n32 compiled kernel with 64-bit register_t and
: > physaddr_t and 32 bit long and pointer types.
: >
: > I've attached two patches, one for support for n32 in toolchain and
: > one for n32 support in kernel compilation.  With this I am able to
: > compile the kernel and user space with n32, and the boot-up reaches
: > until init. There is a lot more work on user-space and kernel (esp in
: > mips/mips/*.S) before it can complete boot-up.
: >
: > Please review and let me know if you have any comments or objections
: > on this approach. The patches are:
: >
: > http://sites.google.com/site/cjayachandran/files/n32-toolchain.patch
: > Toolchain support for N32
: > - Adds the linker emulations needed for n32
: > - Common preprocessor defines for ABI (_ABI_MIPS_SIM and _ABI???).
: > - Sets the long double type as 64 bit (this should be 128 bit in n32,
: > but there is some work needed to get the 128 bit soft-float working).
: >
: > http://sites.google.com/site/cjayachandran/files/n32-kernel.patch
: > N32 compilation - makefiles and conf
: > - Adds ldscript.mips.n32.
: > - Some cleanup in Makefile.mips, add ABI flags
: > - bsd.cpu.mk CFLAGS for n32 compilation and linking
: >
: > I have introduced a TARGET_N32 similart to TARGET_64 for n32
: > compilation.  But I think on the long term, we need clean up the
: > different flags that affect architecture and ABI. Currently there is
: > an overlap between the TARGET_CPUTYPE flag, the ISA_<arch> flags  and
: > the TARGET_<type> flags.
: >
: > Regards,
: > JC.
: > _______________________________________________
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: >
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