FreeBSD/Linux Kernel Cross Reference
sys/conf/kmod.mk

     #       From: @(#)bsd.prog.mk   5.26 (Berkeley) 6/25/91
     # $FreeBSD: releng/12.0/sys/conf/kmod.mk 335922 2018-07-04 00:18:36Z bdrewery $
     #
     # The include file <bsd.kmod.mk> handles building and installing loadable
     # kernel modules.
     #
     #
     # +++ variables +++
     #
    # CLEANFILES    Additional files to remove for the clean and cleandir targets.
    #
    # EXPORT_SYMS   A list of symbols that should be exported from the module,
    #               or the name of a file containing a list of symbols, or YES
    #               to export all symbols.  If not defined, no symbols are
    #               exported.
    #
    # KMOD          The name of the kernel module to build.
    #
    # KMODDIR       Base path for kernel modules (see kld(4)). [/boot/kernel]
    #
    # KMODOWN       Module file owner. [${BINOWN}]
    #
    # KMODGRP       Module file group. [${BINGRP}]
    #
    # KMODMODE      Module file mode. [${BINMODE}]
    #
    # KMODLOAD      Command to load a kernel module [/sbin/kldload]
    #
    # KMODUNLOAD    Command to unload a kernel module [/sbin/kldunload]
    #
    # KMODISLOADED  Command to check whether a kernel module is
    #               loaded [/sbin/kldstat -q -n]
    #
    # PROG          The name of the kernel module to build.
    #               If not supplied, ${KMOD}.ko is used.
    #
    # SRCS          List of source files.
    #
    # FIRMWS        List of firmware images in format filename:shortname:version
    #
    # FIRMWARE_LICENSE
    #               Set to the name of the license the user has to agree on in
    #               order to use this firmware. See /usr/share/doc/legal
    #
    # DESTDIR       The tree where the module gets installed. [not set]
    #
    # KERNBUILDDIR
    #               Set to the location of the kernel build directory where
    #               the opt_*.h files, .o's and kernel winds up.
    #
    # +++ targets +++
    #
    #       install:
    #               install the kernel module; if the Makefile
    #               does not itself define the target install, the targets
    #               beforeinstall and afterinstall may also be used to cause
    #               actions immediately before and after the install target
    #               is executed.
    #
    #       load:
    #               Load a module.
    #
    #       unload:
    #               Unload a module.
    #
    #       reload:
    #               Unload if loaded, then load.
    #
    
    AWK?=           awk
    KMODLOAD?=      /sbin/kldload
    KMODUNLOAD?=    /sbin/kldunload
    KMODISLOADED?=  /sbin/kldstat -q -n
    OBJCOPY?=       objcopy
    
    .include <bsd.init.mk>
    # Grab all the options for a kernel build. For backwards compat, we need to
    # do this after bsd.own.mk.
    .include "kern.opts.mk"
    .include <bsd.compiler.mk>
    .include "config.mk"
    
    # Search for kernel source tree in standard places.
    .if empty(KERNBUILDDIR)
    .if !defined(SYSDIR)
    .for _dir in ${SRCTOP:D${SRCTOP}/sys} \
        ${.CURDIR}/../.. ${.CURDIR}/../../.. /sys /usr/src/sys
    .if !defined(SYSDIR) && exists(${_dir}/kern/)
    SYSDIR= ${_dir:tA}
    .endif
    .endfor
    .endif
    .if !defined(SYSDIR) || !exists(${SYSDIR}/kern/)
    .error "can't find kernel source tree"
    .endif
    .endif
    
    .SUFFIXES: .out .o .c .cc .cxx .C .y .l .s .S .m
    
   # amd64 and mips use direct linking for kmod, all others use shared binaries
   .if ${MACHINE_CPUARCH} != amd64 && ${MACHINE_CPUARCH} != mips
   __KLD_SHARED=yes
   .else
   __KLD_SHARED=no
   .endif
   
   .if !empty(CFLAGS:M-O[23s]) && empty(CFLAGS:M-fno-strict-aliasing)
   CFLAGS+=        -fno-strict-aliasing
   .endif
   WERROR?=        -Werror
   CFLAGS+=        ${WERROR}
   CFLAGS+=        -D_KERNEL
   CFLAGS+=        -DKLD_MODULE
   .if defined(MODULE_TIED)
   CFLAGS+=        -DKLD_TIED
   .endif
   
   # Don't use any standard or source-relative include directories.
   NOSTDINC=       -nostdinc
   CFLAGS:=        ${CFLAGS:N-I*} ${NOSTDINC} ${INCLMAGIC} ${CFLAGS:M-I*}
   .if defined(KERNBUILDDIR)
   CFLAGS+=        -DHAVE_KERNEL_OPTION_HEADERS -include ${KERNBUILDDIR}/opt_global.h
   .endif
   
   # Add -I paths for system headers.  Individual module makefiles don't
   # need any -I paths for this.  Similar defaults for .PATH can't be
   # set because there are no standard paths for non-headers.
   CFLAGS+=        -I. -I${SYSDIR} -I${SYSDIR}/contrib/ck/include
   
   CFLAGS.gcc+=    -finline-limit=${INLINE_LIMIT}
   CFLAGS.gcc+=    -fms-extensions
   CFLAGS.gcc+= --param inline-unit-growth=100
   CFLAGS.gcc+= --param large-function-growth=1000
   
   # Disallow common variables, and if we end up with commons from
   # somewhere unexpected, allocate storage for them in the module itself.
   CFLAGS+=        -fno-common
   LDFLAGS+=       -d -warn-common
   
   .if defined(LINKER_FEATURES) && ${LINKER_FEATURES:Mbuild-id}
   LDFLAGS+=       -Wl,--build-id=sha1
   .endif
   
   CFLAGS+=        ${DEBUG_FLAGS}
   .if ${MACHINE_CPUARCH} == amd64
   CFLAGS+=        -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
   .endif
   
   .if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "riscv"
   CFLAGS+=        -fPIC
   .endif
   
   # Temporary workaround for PR 196407, which contains the fascinating details.
   # Don't allow clang to use fpu instructions or registers in kernel modules.
   .if ${MACHINE_CPUARCH} == arm
   .if ${COMPILER_VERSION} < 30800
   CFLAGS.clang+=  -mllvm -arm-use-movt=0
   .else
   CFLAGS.clang+=  -mno-movt
   .endif
   CFLAGS.clang+=  -mfpu=none
   CFLAGS+=        -funwind-tables
   .endif
   
   .if ${MACHINE_CPUARCH} == powerpc
   CFLAGS+=        -mlongcall -fno-omit-frame-pointer
   .endif
   
   .if ${MACHINE_CPUARCH} == mips
   CFLAGS+=        -G0 -fno-pic -mno-abicalls -mlong-calls
   .endif
   
   .if defined(DEBUG) || defined(DEBUG_FLAGS)
   CTFFLAGS+=      -g
   .endif
   
   .if defined(FIRMWS)
   ${KMOD:S/$/.c/}: ${SYSDIR}/tools/fw_stub.awk
           ${AWK} -f ${SYSDIR}/tools/fw_stub.awk ${FIRMWS} -m${KMOD} -c${KMOD:S/$/.c/g} \
               ${FIRMWARE_LICENSE:C/.+/-l/}${FIRMWARE_LICENSE}
   
   SRCS+=  ${KMOD:S/$/.c/}
   CLEANFILES+=    ${KMOD:S/$/.c/}
   
   .for _firmw in ${FIRMWS}
   ${_firmw:C/\:.*$/.fwo/:T}:      ${_firmw:C/\:.*$//}
           @${ECHO} ${_firmw:C/\:.*$//} ${.ALLSRC:M*${_firmw:C/\:.*$//}}
           @if [ -e ${_firmw:C/\:.*$//} ]; then                    \
                   ${LD} -b binary --no-warn-mismatch ${_LDFLAGS}  \
                       -m ${LD_EMULATION} -r -d                    \
                       -o ${.TARGET} ${_firmw:C/\:.*$//};          \
           else                                                    \
                   ln -s ${.ALLSRC:M*${_firmw:C/\:.*$//}} ${_firmw:C/\:.*$//}; \
                   ${LD} -b binary --no-warn-mismatch ${_LDFLAGS}  \
                       -m ${LD_EMULATION} -r -d                    \
                       -o ${.TARGET} ${_firmw:C/\:.*$//};          \
                   rm ${_firmw:C/\:.*$//};                         \
           fi
   
   OBJS+=  ${_firmw:C/\:.*$/.fwo/:T}
   .endfor
   .endif
   
   # Conditionally include SRCS based on kernel config options.
   .for _o in ${KERN_OPTS}
   SRCS+=${SRCS.${_o}}
   .endfor
   
   OBJS+=  ${SRCS:N*.h:R:S/$/.o/g}
   
   .if !defined(PROG)
   PROG=   ${KMOD}.ko
   .endif
   
   .if !defined(DEBUG_FLAGS)
   FULLPROG=       ${PROG}
   .else
   FULLPROG=       ${PROG}.full
   ${PROG}: ${FULLPROG} ${PROG}.debug
           ${OBJCOPY} --strip-debug --add-gnu-debuglink=${PROG}.debug \
               ${FULLPROG} ${.TARGET}
   ${PROG}.debug: ${FULLPROG}
           ${OBJCOPY} --only-keep-debug ${FULLPROG} ${.TARGET}
   .endif
   
   .if ${__KLD_SHARED} == yes
   ${FULLPROG}: ${KMOD}.kld
           ${LD} -m ${LD_EMULATION} -Bshareable -znotext ${_LDFLAGS} \
               -o ${.TARGET} ${KMOD}.kld
   .if !defined(DEBUG_FLAGS)
           ${OBJCOPY} --strip-debug ${.TARGET}
   .endif
   .endif
   
   EXPORT_SYMS?=   NO
   .if ${EXPORT_SYMS} != YES
   CLEANFILES+=    export_syms
   .endif
   
   .if ${__KLD_SHARED} == yes
   ${KMOD}.kld: ${OBJS}
   .else
   ${FULLPROG}: ${OBJS}
   .endif
           ${LD} -m ${LD_EMULATION} ${_LDFLAGS} -r -d -o ${.TARGET} ${OBJS}
   .if ${MK_CTF} != "no"
           ${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${OBJS}
   .endif
   .if defined(EXPORT_SYMS)
   .if ${EXPORT_SYMS} != YES
   .if ${EXPORT_SYMS} == NO
           :> export_syms
   .elif !exists(${.CURDIR}/${EXPORT_SYMS})
           echo -n "${EXPORT_SYMS:@s@$s${.newline}@}" > export_syms
   .else
           grep -v '^#' < ${EXPORT_SYMS} > export_syms
   .endif
           ${AWK} -f ${SYSDIR}/conf/kmod_syms.awk ${.TARGET} \
               export_syms | xargs -J% ${OBJCOPY} % ${.TARGET}
   .endif
   .endif # defined(EXPORT_SYMS)
   .if defined(PREFIX_SYMS)
           ${AWK} -v prefix=${PREFIX_SYMS} -f ${SYSDIR}/conf/kmod_syms_prefix.awk \
               ${.TARGET} /dev/null | xargs -J% ${OBJCOPY} % ${.TARGET}
   .endif
   .if !defined(DEBUG_FLAGS) && ${__KLD_SHARED} == no
           ${OBJCOPY} --strip-debug ${.TARGET}
   .endif
   
   _ILINKS=machine
   .if ${MACHINE} != ${MACHINE_CPUARCH} && ${MACHINE} != "arm64"
   _ILINKS+=${MACHINE_CPUARCH}
   .endif
   .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
   _ILINKS+=x86
   .endif
   CLEANFILES+=${_ILINKS}
   
   all: ${PROG}
   
   beforedepend: ${_ILINKS}
   beforebuild: ${_ILINKS}
   
   # Ensure that the links exist without depending on it when it exists which
   # causes all the modules to be rebuilt when the directory pointed to changes.
   .for _link in ${_ILINKS}
   .if !exists(${.OBJDIR}/${_link})
   OBJS_DEPEND_GUESS+=     ${_link}
   .endif
   .endfor
   
   .NOPATH: ${_ILINKS}
   
   ${_ILINKS}:
           @case ${.TARGET} in \
           machine) \
                   path=${SYSDIR}/${MACHINE}/include ;; \
           *) \
                   path=${SYSDIR}/${.TARGET:T}/include ;; \
           esac ; \
           path=`(cd $$path && /bin/pwd)` ; \
           ${ECHO} ${.TARGET:T} "->" $$path ; \
           ln -fns $$path ${.TARGET:T}
   
   CLEANFILES+= ${PROG} ${KMOD}.kld ${OBJS}
   
   .if defined(DEBUG_FLAGS)
   CLEANFILES+= ${FULLPROG} ${PROG}.debug
   .endif
   
   .if !target(install)
   
   _INSTALLFLAGS:= ${INSTALLFLAGS}
   .for ie in ${INSTALLFLAGS_EDIT}
   _INSTALLFLAGS:= ${_INSTALLFLAGS${ie}}
   .endfor
   
   .if !target(realinstall)
   KERN_DEBUGDIR?= ${DEBUGDIR}
   realinstall: _kmodinstall
   .ORDER: beforeinstall _kmodinstall
   _kmodinstall: .PHONY
           ${INSTALL} -T release -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
               ${_INSTALLFLAGS} ${PROG} ${DESTDIR}${KMODDIR}/
   .if defined(DEBUG_FLAGS) && !defined(INSTALL_NODEBUG) && ${MK_KERNEL_SYMBOLS} != "no"
           ${INSTALL} -T debug -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
               ${_INSTALLFLAGS} ${PROG}.debug ${DESTDIR}${KERN_DEBUGDIR}${KMODDIR}/
   .endif
   
   .include <bsd.links.mk>
   
   .if !defined(NO_XREF)
   afterinstall: _kldxref
   .ORDER: realinstall _kldxref
   .ORDER: _installlinks _kldxref
   _kldxref: .PHONY
           @if type kldxref >/dev/null 2>&1; then \
                   ${ECHO} kldxref ${DESTDIR}${KMODDIR}; \
                   kldxref ${DESTDIR}${KMODDIR}; \
           fi
   .endif
   .endif # !target(realinstall)
   
   .endif # !target(install)
   
   .if !target(load)
   load: ${PROG} .PHONY
           ${KMODLOAD} -v ${.OBJDIR}/${PROG}
   .endif
   
   .if !target(unload)
   unload: .PHONY
           if ${KMODISLOADED} ${PROG} ; then ${KMODUNLOAD} -v ${PROG} ; fi
   .endif
   
   .if !target(reload)
   reload: unload load .PHONY
   .endif
   
   .if defined(KERNBUILDDIR)
   .PATH: ${KERNBUILDDIR}
   CFLAGS+=        -I${KERNBUILDDIR}
   .for _src in ${SRCS:Mopt_*.h}
   CLEANFILES+=    ${_src}
   .if !target(${_src})
   ${_src}:
           ln -sf ${KERNBUILDDIR}/${_src} ${.TARGET}
   .endif
   .endfor
   .else
   .for _src in ${SRCS:Mopt_*.h}
   CLEANFILES+=    ${_src}
   .if !target(${_src})
   ${_src}:
           :> ${.TARGET}
   .endif
   .endfor
   .endif
   
   # Respect configuration-specific C flags.
   CFLAGS+=        ${ARCH_FLAGS} ${CONF_CFLAGS}
   
   .if !empty(SRCS:Mvnode_if.c)
   CLEANFILES+=    vnode_if.c
   vnode_if.c: ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src
           ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -c
   .endif
   
   .if !empty(SRCS:Mvnode_if.h)
   CLEANFILES+=    vnode_if.h vnode_if_newproto.h vnode_if_typedef.h
   vnode_if.h vnode_if_newproto.h vnode_if_typedef.h: ${SYSDIR}/tools/vnode_if.awk \
       ${SYSDIR}/kern/vnode_if.src
   vnode_if.h: vnode_if_newproto.h vnode_if_typedef.h
           ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -h
   vnode_if_newproto.h:
           ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -p
   vnode_if_typedef.h:
           ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -q
   .endif
   
   # Build _if.[ch] from _if.m, and clean them when we're done.
   # __MPATH defined in config.mk
   _MFILES=${__MPATH:T:O}
   _MPATH=${__MPATH:H:O:u}
   .PATH.m: ${_MPATH}
   .for _i in ${SRCS:M*_if.[ch]}
   _MATCH=M${_i:R:S/$/.m/}
   _MATCHES=${_MFILES:${_MATCH}}
   .if !empty(_MATCHES)
   CLEANFILES+=    ${_i}
   .endif
   .endfor # _i
   .m.c:   ${SYSDIR}/tools/makeobjops.awk
           ${AWK} -f ${SYSDIR}/tools/makeobjops.awk ${.IMPSRC} -c
   
   .m.h:   ${SYSDIR}/tools/makeobjops.awk
           ${AWK} -f ${SYSDIR}/tools/makeobjops.awk ${.IMPSRC} -h
   
   .for _i in mii pccard
   .if !empty(SRCS:M${_i}devs.h)
   CLEANFILES+=    ${_i}devs.h
   ${_i}devs.h: ${SYSDIR}/tools/${_i}devs2h.awk ${SYSDIR}/dev/${_i}/${_i}devs
           ${AWK} -f ${SYSDIR}/tools/${_i}devs2h.awk ${SYSDIR}/dev/${_i}/${_i}devs
   .endif
   .endfor # _i
   
   .if !empty(SRCS:Mbhnd_nvram_map.h)
   CLEANFILES+=    bhnd_nvram_map.h
   bhnd_nvram_map.h: ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.awk \
       ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
       ${SYSDIR}/dev/bhnd/nvram/nvram_map
   bhnd_nvram_map.h:
           sh ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
               ${SYSDIR}/dev/bhnd/nvram/nvram_map -h
   .endif
   
   .if !empty(SRCS:Mbhnd_nvram_map_data.h)
   CLEANFILES+=    bhnd_nvram_map_data.h
   bhnd_nvram_map_data.h: ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.awk \
       ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
       ${SYSDIR}/dev/bhnd/nvram/nvram_map
   bhnd_nvram_map_data.h:
           sh ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
               ${SYSDIR}/dev/bhnd/nvram/nvram_map -d
   .endif
   
   .if !empty(SRCS:Musbdevs.h)
   CLEANFILES+=    usbdevs.h
   usbdevs.h: ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs
           ${AWK} -f ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs -h
   .endif
   
   .if !empty(SRCS:Musbdevs_data.h)
   CLEANFILES+=    usbdevs_data.h
   usbdevs_data.h: ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs
           ${AWK} -f ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs -d
   .endif
   
   .if !empty(SRCS:Macpi_quirks.h)
   CLEANFILES+=    acpi_quirks.h
   acpi_quirks.h: ${SYSDIR}/tools/acpi_quirks2h.awk ${SYSDIR}/dev/acpica/acpi_quirks
           ${AWK} -f ${SYSDIR}/tools/acpi_quirks2h.awk ${SYSDIR}/dev/acpica/acpi_quirks
   .endif
   
   .if !empty(SRCS:Massym.inc) || !empty(DPSRCS:Massym.inc)
   CLEANFILES+=    assym.inc
   DEPENDOBJS+=    genassym.o
   DPSRCS+=        offset.inc
   .endif
   .if defined(MODULE_TIED)
   DPSRCS+=        offset.inc
   .endif
   .if !empty(SRCS:Moffset.inc) || !empty(DPSRCS:Moffset.inc)
   CLEANFILES+=    offset.inc genoffset.o
   DEPENDOBJS+=    genoffset.o
   .endif
   assym.inc: genassym.o
   offset.inc: genoffset.o
   assym.inc: ${SYSDIR}/kern/genassym.sh
           sh ${SYSDIR}/kern/genassym.sh genassym.o > ${.TARGET}
   genassym.o: ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c offset.inc
   genassym.o: ${SRCS:Mopt_*.h}
           ${CC} -c ${CFLAGS:N-flto:N-fno-common} \
               ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
   offset.inc: ${SYSDIR}/kern/genoffset.sh genoffset.o
           sh ${SYSDIR}/kern/genoffset.sh genoffset.o > ${.TARGET}
   genoffset.o: ${SYSDIR}/kern/genoffset.c
   genoffset.o: ${SRCS:Mopt_*.h}
           ${CC} -c ${CFLAGS:N-flto:N-fno-common} \
               ${SYSDIR}/kern/genoffset.c
   
   CLEANDEPENDFILES+=      ${_ILINKS}
   # .depend needs include links so we remove them only together.
   cleanilinks:
           rm -f ${_ILINKS}
   
   OBJS_DEPEND_GUESS+= ${SRCS:M*.h}
   .if defined(KERNBUILDDIR)
   OBJS_DEPEND_GUESS+= opt_global.h
   .endif
   
   .include <bsd.dep.mk>
   .include <bsd.clang-analyze.mk>
   .include <bsd.obj.mk>
   .include "kern.mk"

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