ce697ccee1
Kbuild puts the objects listed in head-y at the head of vmlinux. Conventionally, we do this for head*.S, which contains the kernel entry point. A counter approach is to control the section order by the linker script. Actually, the code marked as __HEAD goes into the ".head.text" section, which is placed before the normal ".text" section. I do not know if both of them are needed. From the build system perspective, head-y is not mandatory. If you can achieve the proper code placement by the linker script only, it would be cleaner. I collected the current head-y objects into head-object-list.txt. It is a whitelist. My hope is it will be reduced in the long run. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Nick Desaulniers <ndesaulniers@google.com> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
3.4 KiB
SPDX-License-Identifier: GPL-2.0
KBUILD_DEFCONFIG := mmu_defconfig
UTS_SYSNAME = -DUTS_SYSNAME="Linux"
What CPU version are we building for, and crack it open
as major.minor.rev
CPU_VER := $(CONFIG_XILINX_MICROBLAZE0_HW_VER) CPU_MAJOR := $(word 1, $(subst ., , $(CPU_VER))) CPU_MINOR := $(word 2, $(subst ., , $(CPU_VER))) CPU_REV := $(word 3, $(subst ., , $(CPU_VER)))
export CPU_VER CPU_MAJOR CPU_MINOR CPU_REV
Use cpu-related CONFIG_ vars to set compile options.
The various CONFIG_XILINX cpu features options are integers 0/1/2...
rather than bools y/n
Work out HW multipler support. This is tricky.
1. Spartan2 has no HW multipliers.
2. MicroBlaze v3.x always uses them, except in Spartan 2
3. All other FPGa/CPU ver combos, we can trust the CONFIG_ settings
ifeq (,$(findstring spartan2,$(CONFIG_XILINX_MICROBLAZE0_FAMILY))) ifeq ($(CPU_MAJOR),3) CPUFLAGS-1 += -mno-xl-soft-mul else # USE_HW_MUL can be 0, 1, or 2, defining a hierarchy of HW Mul support. CPUFLAGS-$(subst 1,,$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL)) += -mxl-multiply-high CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_HW_MUL) += -mno-xl-soft-mul endif endif CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_DIV) += -mno-xl-soft-div CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_BARREL) += -mxl-barrel-shift CPUFLAGS-$(CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR) += -mxl-pattern-compare
ifdef CONFIG_CPU_BIG_ENDIAN KBUILD_CFLAGS += -mbig-endian KBUILD_AFLAGS += -mbig-endian KBUILD_LDFLAGS += -EB else KBUILD_CFLAGS += -mlittle-endian KBUILD_AFLAGS += -mlittle-endian KBUILD_LDFLAGS += -EL endif
CPUFLAGS-1 += $(call cc-option,-mcpu=v$(CPU_VER))
r31 holds current when in kernel mode
KBUILD_CFLAGS += -ffixed-r31 $(CPUFLAGS-y) $(CPUFLAGS-1) $(CPUFLAGS-2)
libs-y += arch/microblaze/lib/
boot := arch/microblaze/boot
Are we making a simpleImage. target? If so, crack out the boardname
DTB:=$(subst simpleImage.,,$(filter simpleImage.%, $(MAKECMDGOALS)))
export DTB
all: linux.bin
archheaders: $(Q)$(MAKE) $(build)=arch/microblaze/kernel/syscalls all
PHONY += linux.bin linux.bin.gz linux.bin.ub
linux.bin.ub linux.bin.gz: linux.bin
linux.bin: vmlinux
linux.bin linux.bin.gz linux.bin.ub:
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
@echo 'Kernel: $(boot)/$@ is ready' ' (#'cat .version')'
PHONY += simpleImage.$(DTB)
simpleImage.$(DTB): vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(addprefix $(boot)/$@., ub unstrip strip)
@echo 'Kernel: $(boot)/$@ is ready' ' (#'cat .version')'
define archhelp echo '* linux.bin - Create raw binary' echo ' linux.bin.gz - Create compressed raw binary' echo ' linux.bin.ub - Create U-Boot wrapped raw binary' echo ' simpleImage.
MRPROPER_FILES += $(boot)/simpleImage.*