69114be15b
Place -fcall-used* flags behind cc-option so that clang (which doesn't support them) can still compile the kernel. This is a safe change, the reasoning is as follows: In the (normal) 32-bit ABI, %g5 and %g7 is normally reserved, and in the 64-bit ABI, %g7 is the reserved one. Linux turns them into volatile registers by the way of -fcall-used-*, but on the other hand, omitting the flags shouldn't be harmful; compilers will now simply refuse to touch them, and any assembly code that happens to touch them would still work like usual (because Linux' conventions already treats them as volatile anyway). Signed-off-by: Koakuma <koachan@protonmail.com> Reviewed-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Andreas Larsson <andreas@gaisler.com> Link: https://lore.kernel.org/r/20241029-sparc-cflags-v3-1-b28745a6bd71@protonmail.com Signed-off-by: Andreas Larsson <andreas@gaisler.com>
2.5 KiB
SPDX-License-Identifier: GPL-2.0
sparc/Makefile
Makefile for the architecture dependent flags and dependencies on the
Sparc and sparc64.
Copyright (C) 1994,1996,1998 David S. Miller (davem@caip.rutgers.edu)
Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz)
We are not yet configured - so test on arch
ifeq ($(ARCH),sparc64) KBUILD_DEFCONFIG := sparc64_defconfig else KBUILD_DEFCONFIG := sparc32_defconfig endif
ifeq ($(CONFIG_SPARC32),y)
sparc32
CHECKFLAGS += -D__sparc__ KBUILD_LDFLAGS := -m elf32_sparc export BITS := 32 UTS_MACHINE := sparc
We are adding -Wa,-Av8 to KBUILD_CFLAGS to deal with a specs bug in some
versions of gcc. Some gcc versions won't pass -Av8 to binutils when you
give -mcpu=v8. This silently worked with older bintutils versions but
does not any more.
KBUILD_CFLAGS += -m32 -mcpu=v8 -pipe -mno-fpu $(call cc-option,-fcall-used-g5) $(call cc-option,-fcall-used-g7) KBUILD_CFLAGS += -Wa,-Av8
KBUILD_AFLAGS += -m32 -Wa,-Av8
else
sparc64
CHECKFLAGS += -D__sparc__ -D__sparc_v9__ -D__arch64__ KBUILD_LDFLAGS := -m elf64_sparc export BITS := 64 UTS_MACHINE := sparc64
KBUILD_CFLAGS += -m64 -pipe -mno-fpu -mcpu=ultrasparc -mcmodel=medlow KBUILD_CFLAGS += -ffixed-g4 -ffixed-g5 $(call cc-option,-fcall-used-g7) -Wno-sign-compare KBUILD_CFLAGS += -Wa,--undeclared-regs KBUILD_CFLAGS += $(call cc-option,-mtune=ultrasparc3) KBUILD_AFLAGS += -m64 -mcpu=ultrasparc -Wa,--undeclared-regs
ifeq ($(CONFIG_MCOUNT),y) KBUILD_CFLAGS += -pg endif
endif
libs-y += arch/sparc/prom/ libs-y += arch/sparc/lib/
drivers-$(CONFIG_PM) += arch/sparc/power/ drivers-$(CONFIG_VIDEO) += arch/sparc/video/
boot := arch/sparc/boot
Default target
all: zImage
image zImage uImage tftpboot.img vmlinux.aout: vmlinux $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
install: $(call cmd,install)
archheaders: $(Q)$(MAKE) $(build)=arch/sparc/kernel/syscalls all
vdso-install-$(CONFIG_SPARC64) += arch/sparc/vdso/vdso64.so.dbg vdso-install-$(CONFIG_COMPAT) += arch/sparc/vdso/vdso32.so.dbg
This is the image used for packaging
KBUILD_IMAGE := $(boot)/zImage
Don't use tabs in echo arguments.
define archhelp echo '* vmlinux - standard SPARC kernel' echo ' image - kernel image ($(boot)/image)' echo '* zImage - stripped/compressed kernel image ($(boot)/zImage)' echo ' uImage - U-Boot SPARC32 Image (only for LEON)' echo ' vmlinux.aout - a.out kernel for SPARC64' echo ' tftpboot.img - image prepared for tftp' endef