[Bug 215681] head -r310854: TARGET_ARCH=powerpc buildkernel via clang 3.9.1: sys/powerpc/aim/trap_subr32.S:409:2: error: too few operands for instruction

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215681

            Bug ID: 215681
           Summary: head -r310854: TARGET_ARCH=powerpc buildkernel via
                    clang 3.9.1: sys/powerpc/aim/trap_subr32.S:409:2:
                    error: too few operands for instruction
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: markmi at dsl-only.net

It appears that clang 3.9.1 and the kernel's TARGET_ARCH=powerpc
assembler notations do not match in at least one way:

--- locore.o ---
/usr/src/sys/powerpc/aim/trap_subr32.S:409:2: error: too few operands for
instruction
 cmp 0, %r1, %r3
 ^
*** [locore.o] Error code 1

make[2]: stopped in
/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG
.ERROR_TARGET='locore.o'
.ERROR_META_FILE='/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG/locore.o.meta'


# Meta data file
/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG/locore.o.meta
CMD cc -target powerpc-unknown-freebsd12.0
--sysroot=/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/tmp
-B/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/tmp/usr/bin -c -x
assembler-with-cpp -DLOCORE -O -pipe  -g -nostdinc  -I. -I/usr/src/sys
-I/usr/src/sys/contrib/libfdt -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS -include
opt_global.h  -msoft-float -fPIC -fno-omit-frame-pointer -mno-altivec
-ffreestanding -fwrapv -fstack-protector -gdwarf-2 -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith
-Winline -Wcast-qual -Wundef -Wno-pointer-sign -D__printf__=__freebsd_kprintf__
-Wmissing-include-dirs -fdiagnostics-show-option -Wno-unknown-pragmas
-Wno-error-tautological-compare -Wno-error-empty-body
-Wno-error-parentheses-equality -Wno-error-unused-function
-Wno-error-pointer-sign -Wno-error-shift-negative-value  -msoft-float 
-std=iso9899:1999  -Werror /usr/src/sys/powerpc/aim/locore.S
CWD
/usr/obj/powerpcvtsc_clang_kernel/powerpc.powerpc/usr/src/sys/GENERICvtsc-NODBG
TARGET locore.o
-- command output --
/usr/src/sys/powerpc/aim/trap_subr32.S:409:2: error: too few operands for
instruction
 cmp 0, %r1, %r3
 ^
*** Error code 1


It is not clear to me which is to change: clang or the kernel assembler source
(or both).

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