ce1ef8c58e
Originally, hack.c was compiled into a shard object with just -shared
-nostdlib. This assumed that ${CC} did not require any additional
flags for ABIs, cross-building, etc.
When kern.post.mk was created in r89509 by reducing duplication in
kernel Makefile.<arch> files, the -shared flag was moved into a
HACK_EXTRA_FLAGS variable so that sparc64 could override it with
-Wl,-shared. The sparc64 hack was removed in r111650, but
HACK_EXTRA_FLAGS was left in place. Over time, we have started
support toolchains that require flags to support alternate ABIs on
MIPS and PowerPC and started (ab)using HACK_EXTRA_FLAGS to set only
those flags.
I need to fix risc-v to pass -mno-relax to the hack.c build for lld in
llvm 10, and the patches to support cross-build from non-FreeBSD hosts
need to include -target for clang in CFLAGS for hack.c. Rather than
adding more hacks into HACK_EXTRA_FLAGS, just use the full set of
CFLAGS with hack.c.
Reviewed by: kib, arichardson
MFC after: 1 month
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D23362
109 lines
2.9 KiB
Makefile
109 lines
2.9 KiB
Makefile
# Makefile.mips
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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/mips/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.mips
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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= 600012
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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
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LDSCRIPT_NAME?=ldscript.$M
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SYSTEM_LD:= ${SYSTEM_LD:$S/conf/${LDSCRIPT_NAME}=${LDSCRIPT_NAME}}
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SYSTEM_DEP:= ${SYSTEM_DEP:$S/conf/${LDSCRIPT_NAME}=${LDSCRIPT_NAME}}
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KERNLOADADDR?=0x80001000
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# This obscure value is defined by CFE for WR160N
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# To be changed later
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TRAMPLOADADDR?=0x807963c0
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# We default to the MIPS32 ISA for O32 and MIPS64 ISA for N64 and N32
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# if none is specified in the kernel configuration file.
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.if ${MACHINE_ARCH:Mmips64*} != "" || ${MACHINE_ARCH:Mmipsn32*} != ""
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ARCH_FLAGS?=-march=mips64
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.else
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ARCH_FLAGS?=-march=mips32
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.endif
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ARCH_FLAGS+=-mabi=${MIPS_ABI}
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EXTRA_FLAGS=-fno-pic -mno-abicalls -G0 -DKERNLOADADDR=${KERNLOADADDR}
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EXTRA_FLAGS+=-${MIPS_ENDIAN}
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# We add the -fno-pic flag to kernels because otherwise performance
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# is extremely poor, as well as -mno-abicalls to force no ABI usage.
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CFLAGS+=${EXTRA_FLAGS} $(ARCH_FLAGS)
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TRAMP_ARCH_FLAGS?=$(ARCH_FLAGS)
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TRAMP_EXTRA_FLAGS=${EXTRA_FLAGS} ${TRAMP_ARCH_FLAGS}
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# Kernel code is always compiled with soft-float on MIPS
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TRAMP_EXTRA_FLAGS+=-msoft-float
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.if ${MACHINE_ARCH:Mmips64*} != ""
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TRAMP_ELFSIZE=64
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.else
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TRAMP_ELFSIZE=32
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.endif
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ASM_CFLAGS+=${CFLAGS} -D_LOCORE -DLOCORE
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.if !defined(WITHOUT_KERNEL_TRAMPOLINE)
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KERNEL_EXTRA=trampoline
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KERNEL_EXTRA_INSTALL=${KERNEL_KO}.tramp.bin
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trampoline: ${KERNEL_KO}.tramp.bin
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${KERNEL_KO}.tramp.bin: ${KERNEL_KO} $S/$M/$M/elf_trampoline.c \
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$S/$M/$M/inckern.S
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${OBJCOPY} --strip-symbol '$$d' --strip-symbol '$$a' \
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-g --strip-symbol '$$t' ${FULLKERNEL} ${KERNEL_KO}.tmp
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sed -e s/${KERNLOADADDR}/${TRAMPLOADADDR}/ -e s/" + SIZEOF_HEADERS"// \
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${LDSCRIPT_NAME} > ${LDSCRIPT_NAME}.tramp.noheader
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${CC} -O -nostdlib -I. -I$S ${TRAMP_EXTRA_FLAGS} ${TRAMP_LDFLAGS} -Xlinker \
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-T -Xlinker ${LDSCRIPT_NAME}.tramp.noheader \
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-DKERNNAME="\"${KERNEL_KO}.tmp\"" -DELFSIZE=${TRAMP_ELFSIZE} \
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-fno-asynchronous-unwind-tables \
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$S/$M/$M/inckern.S $S/$M/$M/elf_trampoline.c \
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-o ${KERNEL_KO}.tramp.elf
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${OBJCOPY} -S -O binary ${KERNEL_KO}.tramp.elf \
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${KERNEL_KO}.tramp.bin
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.endif
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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+= ${LDSCRIPT_NAME} ${LDSCRIPT_NAME}.tramp.noheader \
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${KERNEL_KO}.tramp.elf ${KERNEL_KO}.tramp.bin
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${LDSCRIPT_NAME}: $S/conf/${LDSCRIPT_NAME}
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sed s/KERNLOADADDR/${KERNLOADADDR}/g $S/conf/${LDSCRIPT_NAME} \
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> ${LDSCRIPT_NAME}
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%RULES
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.include "$S/conf/kern.post.mk"
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