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Commit efe0160c authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Michael Ellerman
Browse files

powerpc/64: Linker on-demand sfpr functions for modules 



For final link, the powerpc64 linker generates fpr save/restore
functions on-demand, placing them in the .sfpr section. Starting with
binutils 2.25, these can be provided for non-final links with
--save-restore-funcs. Use that where possible for module links.

This saves about 200 bytes per module (~60kB) on powernv defconfig
build.

Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent cde9f2f4

arch/powerpc/Makefile

+10 −0
Original line number Diff line number Diff line
@@ -189,7 +189,17 @@ else 
CHECKFLAGS	+= -D__LITTLE_ENDIAN__

endif



ifdef CONFIG_PPC32

KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

else

ifeq ($(call ld-ifversion, -ge, 225000000, y),y)

# Have the linker provide sfpr if possible.

# There is a corresponding test in arch/powerpc/lib/Makefile

KBUILD_LDFLAGS_MODULE += --save-restore-funcs

else

KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o

endif

endif



ifeq ($(CONFIG_476FPE_ERR46),y)

	KBUILD_LDFLAGS_MODULE += --ppc476-workaround \

arch/powerpc/lib/Makefile

+8 −5
Original line number Diff line number Diff line
@@ -11,12 +11,15 @@ CFLAGS_REMOVE_feature-fixups.o = $(CC_FLAGS_FTRACE) 


obj-y += string.o alloc.o code-patching.o feature-fixups.o



obj-$(CONFIG_PPC32)	+= div64.o copy_32.o crtsavres.o



# See corresponding test in arch/powerpc/Makefile

# 64-bit linker creates .sfpr on demand for final link (vmlinux),

# so it is only needed for modules.

obj-$(CONFIG_PPC32) += crtsavres.o

# so it is only needed for modules, and only for older linkers which

# do not support --save-restore-funcs

ifeq ($(call ld-ifversion, -lt, 225000000, y),y)

extra-$(CONFIG_PPC64)	+= crtsavres.o



obj-$(CONFIG_PPC32)	+= div64.o copy_32.o

endif



obj64-y	+= copypage_64.o copyuser_64.o mem_64.o hweight_64.o \

	   copyuser_power7.o string_64.o copypage_power7.o memcpy_power7.o \