linux_dsm_epyc7002/arch/sh/mm/Makefile_64

#
# Makefile for the Linux SuperH-specific parts of the memory manager.
#

obj-y			:= init.o extable_64.o consistent.o

mmu-y			:= tlb-nommu.o pg-nommu.o
mmu-$(CONFIG_MMU)	:= fault_64.o ioremap_64.o tlbflush_64.o tlb-sh5.o

ifndef CONFIG_CACHE_OFF
obj-y			+= cache-sh5.o
endif

obj-y			+= $(mmu-y)

obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
obj-$(CONFIG_NUMA)		+= numa.o

EXTRA_CFLAGS += -Werror

# Special flags for fault_64.o.  This puts restrictions on the number of
# caller-save registers that the compiler can target when building this file.
# This is required because the code is called from a context in entry.S where
# very few registers have been saved in the exception handler (for speed
# reasons).
# The caller save registers that have been saved and which can be used are
# r2,r3,r4,r5 : argument passing
# r15, r18 : SP and LINK
# tr0-4 : allow all caller-save TR's.  The compiler seems to be able to make
#         use of them, so it's probably beneficial to performance to save them
#         and have them available for it.
#
# The resources not listed below are callee save, i.e. the compiler is free to
# use any of them and will spill them to the stack itself.

CFLAGS_fault_64.o += -ffixed-r7 \
	-ffixed-r8 -ffixed-r9 -ffixed-r10 -ffixed-r11 -ffixed-r12 \
	-ffixed-r13 -ffixed-r14 -ffixed-r16 -ffixed-r17 -ffixed-r19 \
	-ffixed-r20 -ffixed-r21 -ffixed-r22 -ffixed-r23 \
	-ffixed-r24 -ffixed-r25 -ffixed-r26 -ffixed-r27 \
	-ffixed-r36 -ffixed-r37 -ffixed-r38 -ffixed-r39 -ffixed-r40 \
	-ffixed-r41 -ffixed-r42 -ffixed-r43  \
	-ffixed-r60 -ffixed-r61 -ffixed-r62 \
	-fomit-frame-pointer