mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-01 10:42:11 +00:00
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>
94 lines
2.5 KiB
Makefile
94 lines
2.5 KiB
Makefile
# 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
|