c0930e7be3
This brings arm into line with how every other arch does it. For some reason, only arm lacked a definition of a symbol named kernbase in its locore.S file(s) for use in its ldscript.arm file. Needlessly different means harder to maintain. Using a common symbol name also eases work in progress on a script to help generate arm and arm64 kernels packaged in various ways (like with a header blob needed for a bootloader prepended to the kernel file).
110 lines
2.6 KiB
Makefile
110 lines
2.6 KiB
Makefile
# Makefile.arm -- with config changes.
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# Copyright 1990 W. Jolitz
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# from: @(#)Makefile.i386 7.1 5/10/91
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# $FreeBSD$
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#
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# Makefile for FreeBSD
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#
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# This makefile is constructed from a machine description:
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# config machineid
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# Most changes should be made in the machine description
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# /sys/arm/conf/``machineid''
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# after which you should do
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# config machineid
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# Generic makefile changes should be made in
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# /sys/conf/Makefile.arm
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# after which config should be rerun for all machines.
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#
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# Which version of config(8) is required.
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%VERSREQ= 600013
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STD8X16FONT?= iso
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.if !defined(S)
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.if exists(./@/.)
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S= ./@
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.else
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S= ../../..
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.endif
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.endif
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.include "$S/conf/kern.pre.mk"
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INCLUDES+= -I$S/contrib/libfdt -I$S/gnu/dts/include
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.if !defined(DEBUG) && !defined(PROFLEVEL)
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STRIP_FLAGS = -S
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.endif
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# We don't support gcc's thump interwork stuff, so disable it
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CFLAGS.gcc += -mno-thumb-interwork
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# We generally don't want fpu instructions in the kernel.
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CFLAGS.clang += -mfpu=none
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.if !empty(DDB_ENABLED)
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CFLAGS += -funwind-tables
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.if ${COMPILER_TYPE} == "clang" && ${COMPILER_VERSION} < 30500
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# clang < 3.5.0 requires us to tell it to emit assembly with unwind information
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CFLAGS += -mllvm -arm-enable-ehabi
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.endif
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.endif
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# "makeoptions KERNVIRTADDR=" is now optional, supply the default value.
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.if empty(KERNVIRTADDR)
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KERNVIRTADDR= 0xc0000000
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.endif
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# Use a custom SYSTEM_LD command to generate the elf kernel, so we can
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# set the text segment start address, and also strip the "arm mapping
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# symbols" which have names like $a.0 and $d.2; see the document
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# "ELF for the ARM architecture" for more info on the mapping symbols.
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SYSTEM_LD= \
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${SYSTEM_LD_BASECMD} \
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--defsym='text_start=kernbase + SIZEOF_HEADERS' \
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-o ${.TARGET} ${SYSTEM_OBJS} vers.o; \
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$(OBJCOPY) \
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--wildcard \
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--strip-symbol='$$[adt]*' \
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${.TARGET}
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# Generate the .bin (no elf headers) kernel as an extra build output.
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# We must relink to generate the .bin kernel, because without headers the
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# location of everything changes. We also strip the ARM marker symbols.
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KERNEL_EXTRA+= ${KERNEL_KO}.bin
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KERNEL_EXTRA_INSTALL+= ${KERNEL_KO}.bin
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${KERNEL_KO}.bin: ${SYSTEM_DEP} vers.o
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@echo "linking ${.TARGET}"
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@${SYSTEM_LD_BASECMD} \
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--defsym='text_start=kernbase' \
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-o ${.TARGET} ${SYSTEM_OBJS} vers.o
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${SIZE} ${.TARGET}
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@${OBJCOPY} \
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--wildcard \
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--strip-symbol='$$[adt]*' \
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--output-target=binary \
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${.TARGET}
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@chmod 755 ${.TARGET}
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# hack because genassym.c includes sys/bus.h which includes these.
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genassym.o: bus_if.h device_if.h
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%BEFORE_DEPEND
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%OBJS
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%FILES.c
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%FILES.s
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%FILES.m
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%CLEAN
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CLEAN+= ${KERNEL_KO}.bin
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%RULES
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.include "$S/conf/kern.post.mk"
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