[Bug 213458] MIPS ERL kernel build fails on octeon-sdk/cvmx-srio.c with external GCC 5.3.0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213458

            Bug ID: 213458
           Summary: MIPS ERL kernel build fails on octeon-sdk/cvmx-srio.c
                    with external GCC 5.3.0
           Product: Base System
           Version: CURRENT
          Hardware: mips
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-mips at FreeBSD.org
          Reporter: emaste at freebsd.org

make CROSS_TOOLCHAIN=mips64-gcc TARGET_ARCH=mips64 KERNCONF=ERL buildkernel

fails with:

/usr/local/bin/mips64-portbld-freebsd10.1-gcc -isystem
/tank/emaste/obj/mips.mips64/tank/emaste/src/freebsd/tmp/usr/include
-L/tank/emaste/obj/mips.mips64/tank/emaste/src/freebsd/tmp/usr/lib
-B/tank/emaste/obj/mips.mips64/tank/emaste/src/freebsd/tmp/usr/lib
--sysroot=/tank/emaste/obj/mips.mips64/tank/emaste/src/freebsd/tmp
-B/usr/local/mips64-freebsd/bin/ -c -O -pipe  -g -nostdinc  -I.
-I/tank/emaste/src/freebsd/sys -I/tank/emaste/src/freebsd/sys/contrib/libfdt
-D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h  -fno-pic
-mno-abicalls -G0 -DKERNLOADADDR=0xffffffff80100000 -march=octeon -mabi=64 -MD 
-MF.depend.cvmx-srio.o -MTcvmx-srio.o -msoft-float -ffreestanding -fwrapv
-gdwarf-2 -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual -Wundef
-Wno-pointer-sign -fformat-extensions -Wmissing-include-dirs
-fdiagnostics-show-option -Wno-unknown-pragmas -Wno-error=address
-Wno-error=aggressive-loop-optimizations -Wno-error=array-bounds
-Wno-error=attributes -Wno-error=cast-qual -Wno-error=enum-compare
-Wno-error=inline -Wno-error=maybe-uninitialized -Wno-error=overflow
-Wno-error=sequence-point -Wno-error=strict-overflow
-Wno-error=unused-but-set-variable  -fno-common -fms-extensions
-finline-limit=8000 --param inline-unit-growth=10000 --param
large-function-growth=100000 --param max-inline-insns-single=10000 
-std=iso9899:1999 -Werror 
/tank/emaste/src/freebsd/sys/contrib/octeon-sdk/cvmx-srio.c
{standard input}: Assembler messages:
{standard input}:75: Error: opcode not supported on this processor: octeon
(mips64r2) `saa $2,($3)'
{standard input}:4568: Error: opcode not supported on this processor: octeon
(mips64r2) `saa $11,($3)'
{standard input}:4892: Error: opcode not supported on this processor: octeon
(mips64r2) `saa $9,($2)'
{standard input}:5145: Error: opcode not supported on this processor: octeon
(mips64r2) `saa $3,($6)'
*** Error code 1 (ignored)

This issue was also reported on Linux
(https://community.ubnt.com/t5/EdgeMAX/kernel-compilation/td-p/466677/page/4).
A Gentoo wiki page explains that the support was only in a Cavium-provided
toolchain, not upstream (https://wiki.gentoo.org/wiki/MIPS/ERLite-3).

jmallett added saa/saad instructions to our base gas in r208737
(https://svnweb.freebsd.org/changeset/base/208737, see
contrib/binutils/gas/config/tc-mips.c) but support is not in the FreeBSD mips
binutils port.

This issue should probably be addressed by adding support to the binutils port,
and also adding a workaround to the base system.

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