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5a45da02cf
* DWARF unwinder related
+ Force DWARF2 compliant .debug_frame (gcc 4.8 defaults to DWARF4
which kernel unwinder can't grok).
+ Discard the additional .eh_frame generated
+ Discard the dwarf4 debug info generated by -gdwarf-2 for normal
no debug case
* 4.8 already uses arc600 multilibs for -mno-mpy
* switch to using uclibc compiler (to get -mmedium-calls and -mno-sdata)
and also since buildroot can only use 1 toolchain
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
140 lines
4.3 KiB
Makefile
140 lines
4.3 KiB
Makefile
#
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# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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UTS_MACHINE := arc
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ifeq ($(CROSS_COMPILE),)
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CROSS_COMPILE := arc-linux-uclibc-
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endif
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KBUILD_DEFCONFIG := fpga_defconfig
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cflags-y += -mA7 -fno-common -pipe -fno-builtin -D__linux__
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ifdef CONFIG_ARC_CURR_IN_REG
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# For a global register defintion, make sure it gets passed to every file
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# We had a customer reported bug where some code built in kernel was NOT using
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# any kernel headers, and missing the r25 global register
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# Can't do unconditionally because of recursive include issues
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# due to <linux/thread_info.h>
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LINUXINCLUDE += -include ${src}/arch/arc/include/asm/current.h
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endif
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upto_gcc42 := $(call cc-ifversion, -le, 0402, y)
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upto_gcc44 := $(call cc-ifversion, -le, 0404, y)
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atleast_gcc44 := $(call cc-ifversion, -ge, 0404, y)
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atleast_gcc48 := $(call cc-ifversion, -ge, 0408, y)
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cflags-$(atleast_gcc44) += -fsection-anchors
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cflags-$(CONFIG_ARC_HAS_LLSC) += -mlock
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cflags-$(CONFIG_ARC_HAS_SWAPE) += -mswape
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cflags-$(CONFIG_ARC_HAS_RTSC) += -mrtsc
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cflags-$(CONFIG_ARC_DW2_UNWIND) += -fasynchronous-unwind-tables
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# By default gcc 4.8 generates dwarf4 which kernel unwinder can't grok
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ifeq ($(atleast_gcc48),y)
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cflags-$(CONFIG_ARC_DW2_UNWIND) += -gdwarf-2
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endif
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ifndef CONFIG_CC_OPTIMIZE_FOR_SIZE
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# Generic build system uses -O2, we want -O3
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cflags-y += -O3
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endif
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# small data is default for elf32 tool-chain. If not usable, disable it
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# This also allows repurposing GP as scratch reg to gcc reg allocator
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disable_small_data := y
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cflags-$(disable_small_data) += -mno-sdata -fcall-used-gp
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cflags-$(CONFIG_CPU_BIG_ENDIAN) += -mbig-endian
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ldflags-$(CONFIG_CPU_BIG_ENDIAN) += -EB
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# STAR 9000518362: (fixed with binutils shipping with gcc 4.8)
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# arc-linux-uclibc-ld (buildroot) or arceb-elf32-ld (EZChip) don't accept
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# --build-id w/o "-marclinux". Default arc-elf32-ld is OK
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ldflags-$(upto_gcc44) += -marclinux
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ARC_LIBGCC := -mA7
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cflags-$(CONFIG_ARC_HAS_HW_MPY) += -multcost=16
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ifndef CONFIG_ARC_HAS_HW_MPY
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cflags-y += -mno-mpy
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# newlib for ARC700 assumes MPY to be always present, which is generally true
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# However, if someone really doesn't want MPY, we need to use the 600 ver
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# which coupled with -mno-mpy will use mpy emulation
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# With gcc 4.4.7, -mno-mpy is enough to make any other related adjustments,
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# e.g. increased cost of MPY. With gcc 4.2.1 this had to be explicitly hinted
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ifeq ($(upto_gcc42),y)
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ARC_LIBGCC := -marc600
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cflags-y += -multcost=30
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endif
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endif
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LIBGCC := $(shell $(CC) $(ARC_LIBGCC) $(cflags-y) --print-libgcc-file-name)
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# Modules with short calls might break for calls into builtin-kernel
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KBUILD_CFLAGS_MODULE += -mlong-calls
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# Finally dump eveything into kernel build system
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KBUILD_CFLAGS += $(cflags-y)
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KBUILD_AFLAGS += $(KBUILD_CFLAGS)
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LDFLAGS += $(ldflags-y)
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head-y := arch/arc/kernel/head.o
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# See arch/arc/Kbuild for content of core part of the kernel
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core-y += arch/arc/
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# w/o this dtb won't embed into kernel binary
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core-y += arch/arc/boot/dts/
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core-$(CONFIG_ARC_PLAT_FPGA_LEGACY) += arch/arc/plat-arcfpga/
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core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
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drivers-$(CONFIG_OPROFILE) += arch/arc/oprofile/
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libs-y += arch/arc/lib/ $(LIBGCC)
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boot := arch/arc/boot
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#default target for make without any arguements.
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KBUILD_IMAGE := bootpImage
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all: $(KBUILD_IMAGE)
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bootpImage: vmlinux
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boot_targets += uImage uImage.bin uImage.gz
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$(boot_targets): vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
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%.dtb %.dtb.S %.dtb.o: scripts
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$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
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dtbs: scripts
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$(Q)$(MAKE) $(build)=$(boot)/dts dtbs
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archclean:
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$(Q)$(MAKE) $(clean)=$(boot)
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# Hacks to enable final link due to absence of link-time branch relexation
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# and gcc choosing optimal(shorter) branches at -O3
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#
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# vineetg Feb 2010: -mlong-calls switched off for overall kernel build
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# However lib/decompress_inflate.o (.init.text) calls
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# zlib_inflate_workspacesize (.text) causing relocation errors.
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# Thus forcing all exten calls in this file to be long calls
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export CFLAGS_decompress_inflate.o = -mmedium-calls
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export CFLAGS_initramfs.o = -mmedium-calls
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ifdef CONFIG_SMP
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export CFLAGS_core.o = -mmedium-calls
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endif
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