linux/arch/arc/Makefile

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# SPDX-License-Identifier: GPL-2.0-only
#
# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
#
KBUILD_DEFCONFIG := haps_hs_smp_defconfig
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ifeq ($(CROSS_COMPILE),)
CROSS_COMPILE := $(call cc-cross-prefix, arc-linux- arceb-linux-)
endif
ARC: Explicitly add -mmedium-calls to CFLAGS GCC built for arc*-*-linux has "-mmedium-calls" implicitly enabled by default thus we don't see any problems during Linux kernel compilation. ----------------------------->8------------------------ arc-linux-gcc -mcpu=arc700 -Q --help=target | grep calls -mlong-calls [disabled] -mmedium-calls [enabled] ----------------------------->8------------------------ But if we try to use so-called Elf32 toolchain with GCC configured for arc*-*-elf* then we'd see the following failure: ----------------------------->8------------------------ init/do_mounts.o: In function 'init_rootfs': do_mounts.c:(.init.text+0x108): relocation truncated to fit: R_ARC_S21W_PCREL against symbol 'unregister_filesystem' defined in .text section in fs/filesystems.o arc-elf32-ld: final link failed: Symbol needs debug section which does not exist make: *** [vmlinux] Error 1 ----------------------------->8------------------------ That happens because neither "-mmedium-calls" nor "-mlong-calls" are enabled in Elf32 GCC: ----------------------------->8------------------------ arc-elf32-gcc -mcpu=arc700 -Q --help=target | grep calls -mlong-calls [disabled] -mmedium-calls [disabled] ----------------------------->8------------------------ Now to make it possible to use Elf32 toolchain for building Linux kernel we're explicitly add "-mmedium-calls" to CFLAGS. And since we add "-mmedium-calls" to the global CFLAGS there's no point in having per-file copies thus removing them. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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cflags-y += -fno-common -pipe -fno-builtin -mmedium-calls -D__linux__
cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
cflags-$(CONFIG_ISA_ARCV2) += -mcpu=hs38
ifdef CONFIG_ARC_CURR_IN_REG
# For a global register defintion, make sure it gets passed to every file
# We had a customer reported bug where some code built in kernel was NOT using
# any kernel headers, and missing the r25 global register
# Can't do unconditionally because of recursive include issues
# due to <linux/thread_info.h>
LINUXINCLUDE += -include $(srctree)/arch/arc/include/asm/current.h
endif
cflags-y += -fsection-anchors
cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
ifdef CONFIG_ISA_ARCV2
ifdef CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS
cflags-y += -munaligned-access
else
cflags-y += -mno-unaligned-access
endif
ifndef CONFIG_ARC_HAS_LL64
cflags-y += -mno-ll64
endif
ifndef CONFIG_ARC_HAS_DIV_REM
cflags-y += -mno-div-rem
endif
endif
cfi := $(call as-instr,.cfi_startproc\n.cfi_endproc,-DARC_DW2_UNWIND_AS_CFI)
cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables $(cfi)
# small data is default for elf32 tool-chain. If not usable, disable it
# This also allows repurposing GP as scratch reg to gcc reg allocator
disable_small_data := y
cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
LIBGCC = $(shell $(CC) $(cflags-y) --print-libgcc-file-name)
# Modules with short calls might break for calls into builtin-kernel
KBUILD_CFLAGS_MODULE += -mlong-calls -mno-millicode
# Finally dump eveything into kernel build system
KBUILD_CFLAGS += $(cflags-y)
KBUILD_AFLAGS += $(KBUILD_CFLAGS)
KBUILD_LDFLAGS += $(ldflags-y)
head-y := arch/arc/kernel/head.o
# See arch/arc/Kbuild for content of core part of the kernel
core-y += arch/arc/
# w/o this dtb won't embed into kernel binary
core-y += arch/arc/boot/dts/
core-y += arch/arc/plat-sim/
core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
core-$(CONFIG_ARC_PLAT_EZNPS) += arch/arc/plat-eznps/
core-$(CONFIG_ARC_SOC_HSDK) += arch/arc/plat-hsdk/
ifdef CONFIG_ARC_PLAT_EZNPS
KBUILD_CPPFLAGS += -I$(srctree)/arch/arc/plat-eznps/include
endif
drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
libs-y += arch/arc/lib/ $(LIBGCC)
boot := arch/arc/boot
#default target for make without any arguments.
KBUILD_IMAGE := $(boot)/bootpImage
all: bootpImage
bootpImage: vmlinux
boot_targets += uImage uImage.bin uImage.gz
$(boot_targets): vmlinux
$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
archclean:
$(Q)$(MAKE) $(clean)=$(boot)