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With recent binutils update to support dwarf CFI pseudo-ops in gas, we now get .eh_frame vs. .debug_frame. Although the call frame info is exactly the same in both, the CIE differs, which the current kernel unwinder can't cope with. This broke both the kernel unwinder as well as loadable modules (latter because of a new unhandled relo R_ARC_32_PCREL from .rela.eh_frame in the module loader) The ideal solution would be to switch unwinder to .eh_frame. For now however we can make do by just ensureing .debug_frame is generated by removing -fasynchronous-unwind-tables .eh_frame generated with -gdwarf-2 -fasynchronous-unwind-tables .debug_frame generated with -gdwarf-2 Fixes STAR 9001058196 Cc: stable@vger.kernel.org Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
160 lines
4.5 KiB
Makefile
160 lines
4.5 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 ($(CROSS_COMPILE),)
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ifndef CONFIG_CPU_BIG_ENDIAN
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CROSS_COMPILE := arc-linux-
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else
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CROSS_COMPILE := arceb-linux-
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endif
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endif
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KBUILD_DEFCONFIG := nsim_700_defconfig
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cflags-y += -fno-common -pipe -fno-builtin -D__linux__
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cflags-$(CONFIG_ISA_ARCOMPACT) += -mA7
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cflags-$(CONFIG_ISA_ARCV2) += -mcpu=archs
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is_700 = $(shell $(CC) -dM -E - < /dev/null | grep -q "ARC700" && echo 1 || echo 0)
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ifdef CONFIG_ISA_ARCOMPACT
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ifeq ($(is_700), 0)
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$(error Toolchain not configured for ARCompact builds)
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endif
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endif
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ifdef CONFIG_ISA_ARCV2
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ifeq ($(is_700), 1)
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$(error Toolchain not configured for ARCv2 builds)
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endif
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endif
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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_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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ifdef CONFIG_ISA_ARCV2
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ifndef CONFIG_ARC_HAS_LL64
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cflags-y += -mno-ll64
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endif
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ifndef CONFIG_ARC_HAS_DIV_REM
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cflags-y += -mno-div-rem
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endif
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endif
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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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# Note: No need to add to cflags-y as that happens anyways
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#
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# Disable the false maybe-uninitialized warings gcc spits out at -O3
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ARCH_CFLAGS += -O3 $(call cc-disable-warning,maybe-uninitialized,)
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endif
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# small data is default for elf32 tool-chain. If not usable, disable it
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# This also allows repurposing GP as scratch reg to gcc reg allocator
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disable_small_data := y
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cflags-$(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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LIBGCC := $(shell $(CC) $(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 -mno-millicode
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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_SIM) += arch/arc/plat-sim/
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core-$(CONFIG_ARC_PLAT_TB10X) += arch/arc/plat-tb10x/
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core-$(CONFIG_ARC_PLAT_AXS10X) += arch/arc/plat-axs10x/
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core-$(CONFIG_ARC_PLAT_EZNPS) += arch/arc/plat-eznps/
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ifdef CONFIG_ARC_PLAT_EZNPS
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KBUILD_CPPFLAGS += -I$(srctree)/arch/arc/plat-eznps/include
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endif
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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 arguments.
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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
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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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