java.lang.NullPointerException # This file is subject to the terms and conditions of the GNU General Public # License. See the file "COPYING" in the main directory of this archive # for more details.
java.lang.NullPointerException # Copyright (C) 1994, 95, 96, 2003 by Ralf Baechle # DECStation modifications by Paul M. Antoine, 1996 # Copyright (C) 2002, 2003, 2004 Maciej W. Rozycki
java.lang.NullPointerException # This file is included by the global makefile so that you can add your own # architecture-specific flags and dependencies.
java.lang.NullPointerException
java.lang.NullPointerException # GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel # code since it only slows down the whole thing. At some point we might make # use of global pointer optimizations but their use of $28 conflicts with # the current pointer optimization.
java.lang.NullPointerException # The DECStation requires an ECOFF kernel for remote booting, other MIPS # machines may also. Since BFD is incredibly buggy with respect to # crossformat linking we rely on the elf2ecoff tool for format conversion.
java.lang.NullPointerException
cflags-y += -G 0 -mno-abicalls -fno-pic -pipe
cflags-y += -msoft-float -Wa,-msoft-float
LDFLAGS_vmlinux += -G 0 -static -n -nostdlib
KBUILD_AFLAGS_MODULE += -mlong-calls
KBUILD_CFLAGS_MODULE += -mlong-calls
# Some distribution-specific toolchains might pass the -fstack-check # option during the build, which adds a simple stack-probe at the beginning # of every function. This stack probe is to ensure that there is enough # stack space, else a SEGV is generated. This is not desirable for MIPS # as kernel stacks are small, placed in unmapped virtual memory, anddonot # grow when overflowed. Especially on SGI IP27 platforms, this check will # lead to a NULL pointer dereference in _raw_spin_lock_irq.
java.lang.NullPointerException # In disassembly, this stack probe appears at the top of a function as: # sd zero,<offset>(sp) # Where <offset> is a negative value.
java.lang.NullPointerException
cflags-y += -fno-stack-check
# binutils from v2.35 when built with --enable-mips-fix-loongson3-llsc=yes, # supports an -mfix-loongson3-llsc flag which emits a sync prior to each ll # instruction to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h # for a description).
java.lang.NullPointerException # We disable this in order to prevent the assembler meddling with the # instruction that labels refer to, ie. if we label an ll instruction:
java.lang.NullPointerException # 1: ll v0, 0(a0)
java.lang.NullPointerException # ...then with the assembler fix applied the label may actually point at a sync # instruction inserted by the assembler, andif we were using the label in an # exception table the table would no longer contain the address of the ll # instruction.
java.lang.NullPointerException # Avoid this by explicitly disabling that assembler behaviour.
java.lang.NullPointerException
cflags-y += $(call cc-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
java.lang.NullPointerException # Some versions of binutils, not currently mainline as of 2019/02/04, support # an -mfix-loongson3-llsc flag which emits a sync prior to each ll instruction # to work around a CPU bug (see __SYNC_loongson3_war in asm/sync.h for a # description).
java.lang.NullPointerException # We disable this in order to prevent the assembler meddling with the # instruction that labels refer to, ie. if we label an ll instruction:
java.lang.NullPointerException # 1: ll v0, 0(a0)
java.lang.NullPointerException # ...then with the assembler fix applied the label may actually point at a sync # instruction inserted by the assembler, andif we were using the label in an # exception table the table would no longer contain the address of the ll # instruction.
java.lang.NullPointerException # Avoid this by explicitly disabling that assembler behaviour. If upstream # binutils does not merge support for the flag then we can revisit & remove # this later - for now it ensures vendor toolchains don't cause problems.
java.lang.NullPointerException
cflags-$(CONFIG_CPU_LOONGSON64) += $(call as-option,-Wa$(comma)-mno-fix-loongson3-llsc,)
# For smartmips configurations, there are hundreds of warnings due to ISA overrides # in assembly and header files. smartmips is only supported for MIPS32r1 onwards # and there is no support for64-bit. Various '.set mips2'or'.set mips3'or # similar directives in the kernel will spam the build logs with the following warnings: # Warning: the `smartmips' extension requires MIPS32 revision 1 or greater # or # Warning: the 64-bit MIPS architecture does not support the `smartmips' extension # Pass -Wa,--no-warn to disable all assembler warnings until the kernel code has # been fixed properly.
mips-cflags := $(cflags-y)
ifeq ($(CONFIG_CPU_HAS_SMARTMIPS),y)
smartmips-ase := $(call cc-option-yn,$(mips-cflags) -msmartmips)
cflags-$(smartmips-ase) += -msmartmips -Wa,--no-warn
endif
ifeq ($(CONFIG_CPU_MICROMIPS),y)
micromips-ase := $(call cc-option-yn,$(mips-cflags) -mmicromips)
cflags-$(micromips-ase) += -mmicromips
endif
ifeq ($(CONFIG_CPU_HAS_MSA),y)
toolchain-msa := $(call cc-option-yn,$(mips-cflags) -mhard-float -mfp64 -Wa$(comma)-mmsa)
cflags-$(toolchain-msa) += -DTOOLCHAIN_SUPPORTS_MSA
endif
toolchain-virt := $(call cc-option-yn,$(mips-cflags) -mvirt)
cflags-$(toolchain-virt) += -DTOOLCHAIN_SUPPORTS_VIRT # For -mmicromips, use -Wa,-fatal-warnings to catch unsupported -mxpa which # only warns
xpa-cflags-y := $(mips-cflags)
xpa-cflags-$(micromips-ase) += -mmicromips -Wa$(comma)-fatal-warnings
toolchain-xpa := $(call cc-option-yn,$(xpa-cflags-y) -mxpa)
cflags-$(toolchain-xpa) += -DTOOLCHAIN_SUPPORTS_XPA
toolchain-crc := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mcrc)
cflags-$(toolchain-crc) += -DTOOLCHAIN_SUPPORTS_CRC
toolchain-dsp := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mdsp)
cflags-$(toolchain-dsp) += -DTOOLCHAIN_SUPPORTS_DSP
toolchain-ginv := $(call cc-option-yn,$(mips-cflags) -Wa$(comma)-mginv)
cflags-$(toolchain-ginv) += -DTOOLCHAIN_SUPPORTS_GINV
java.lang.NullPointerException # Automatically detect the build format. By default we choose # the elf format according to the load address. # We can always force a build with a 64-bits symbol format by # passing 'KBUILD_SYM32=no' option to the make's command line.
java.lang.NullPointerException
ifdef CONFIG_64BIT
ifndef KBUILD_SYM32
ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
KBUILD_SYM32 = $(call cc-option-yn, -msym32)
endif
endif
# When linking a 32-bit executable the LLVM linker cannot cope with a # 32-bit load address that has been sign-extended to 64 bits. Simply # remove the upper 32 bits then, as it is safe to do so with other # linkers.
ifdef CONFIG_64BIT
load-ld = $(load-y) else
load-ld = $(subst 0xffffffff,0x,$(load-y))
endif
# This is required to get dwarf unwinding tables into .debug_frame # instead of .eh_frame so we don't discard them.
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
java.lang.NullPointerException # Some machines like the Indy need 32-bit ELF binaries for booting purposes. # Other need ECOFF, so we build a 32-bit ELF binary for them which we then # convert to ECOFF using elf2ecoff.
java.lang.NullPointerException
quiet_cmd_32 = OBJCOPY $@
cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
vmlinux.32: vmlinux
$(call cmd,32)
java.lang.NullPointerException # The 64-bit ELF tools are pretty broken so at this time we generate 64-bit # ELF files from 32-bit files by conversion.
java.lang.NullPointerException
quiet_cmd_64 = OBJCOPY $@
cmd_64 = $(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
vmlinux.64: vmlinux
$(call cmd,64)
java.lang.NullPointerException # If the user generates a generic kernel configuration without specifying a # list of boards to include the config fragments for, default to including all # available board config fragments.
java.lang.NullPointerException
ifeq ($(BOARDS),)
BOARDS = $(patsubst board-%.config,%,$(notdir $(wildcard $(generic_config_dir)/board-*.config)))
endif
java.lang.NullPointerException # Generic kernel configurations which merge generic_defconfig with the # appropriate config fragments from arch/mips/configs/generic/, resulting in # the ability to easily configure the kernel for a given architecture, # endianness & set of boards without duplicating the needed configuration in # hundreds of defconfig files.
java.lang.NullPointerException
define gen_generic_defconfigs
$(foreach bits,$(1),$(foreach rev,$(2),$(foreach endian,$(3),
target := $(bits)$(rev)$(filter el,$(endian))_defconfig
generic_defconfigs += $$(target)
$$(target): $(generic_config_dir)/$(bits)$(rev).config
$$(target): $(generic_config_dir)/$(endian).config
)))
endef
java.lang.NullPointerException # Prevent generic merge_config rules attempting to merge single fragments
java.lang.NullPointerException
$(generic_config_dir)/%.config: ;
java.lang.NullPointerException # Prevent direct use of generic_defconfig, which is intended to be used as the # basis of the various ISA-specific targets generated above.
java.lang.NullPointerException
.PHONY: generic_defconfig
generic_defconfig:
$(Q)echo "generic_defconfig is not intended for direct use, but should instead be"
$(Q)echo "used via an ISA-specific target from the following list:"
$(Q)echo
$(Q)for cfg in $(generic_defconfigs); do echo " $${cfg}"; done
$(Q)echo
$(Q)false
java.lang.NullPointerException # Legacy defconfig compatibility - these targets used to be real defconfigs but # now that the boards have been converted to use the generic kernel they are # wrappers around the generic rules above.
java.lang.NullPointerException
legacy_defconfigs += ocelot_defconfig
ocelot_defconfig-y := 32r2el_defconfig BOARDS=ocelot