The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/conf/kmod.mk

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    1 #       From: @(#)bsd.prog.mk   5.26 (Berkeley) 6/25/91
    2 # $FreeBSD: releng/11.1/sys/conf/kmod.mk 318292 2017-05-15 14:23:53Z emaste $
    3 #
    4 # The include file <bsd.kmod.mk> handles building and installing loadable
    5 # kernel modules.
    6 #
    7 #
    8 # +++ variables +++
    9 #
   10 # CLEANFILES    Additional files to remove for the clean and cleandir targets.
   11 #
   12 # EXPORT_SYMS   A list of symbols that should be exported from the module,
   13 #               or the name of a file containing a list of symbols, or YES
   14 #               to export all symbols.  If not defined, no symbols are
   15 #               exported.
   16 #
   17 # KMOD          The name of the kernel module to build.
   18 #
   19 # KMODDIR       Base path for kernel modules (see kld(4)). [/boot/kernel]
   20 #
   21 # KMODOWN       Module file owner. [${BINOWN}]
   22 #
   23 # KMODGRP       Module file group. [${BINGRP}]
   24 #
   25 # KMODMODE      Module file mode. [${BINMODE}]
   26 #
   27 # KMODLOAD      Command to load a kernel module [/sbin/kldload]
   28 #
   29 # KMODUNLOAD    Command to unload a kernel module [/sbin/kldunload]
   30 #
   31 # KMODISLOADED  Command to check whether a kernel module is
   32 #               loaded [/sbin/kldstat -q -n]
   33 #
   34 # PROG          The name of the kernel module to build.
   35 #               If not supplied, ${KMOD}.ko is used.
   36 #
   37 # SRCS          List of source files.
   38 #
   39 # FIRMWS        List of firmware images in format filename:shortname:version
   40 #
   41 # FIRMWARE_LICENSE
   42 #               Set to the name of the license the user has to agree on in
   43 #               order to use this firmware. See /usr/share/doc/legal
   44 #
   45 # DESTDIR       The tree where the module gets installed. [not set]
   46 #
   47 # +++ targets +++
   48 #
   49 #       install:
   50 #               install the kernel module; if the Makefile
   51 #               does not itself define the target install, the targets
   52 #               beforeinstall and afterinstall may also be used to cause
   53 #               actions immediately before and after the install target
   54 #               is executed.
   55 #
   56 #       load:
   57 #               Load a module.
   58 #
   59 #       unload:
   60 #               Unload a module.
   61 #
   62 #       reload:
   63 #               Unload if loaded, then load.
   64 #
   65 
   66 AWK?=           awk
   67 KMODLOAD?=      /sbin/kldload
   68 KMODUNLOAD?=    /sbin/kldunload
   69 KMODISLOADED?=  /sbin/kldstat -q -n
   70 OBJCOPY?=       objcopy
   71 
   72 .include <bsd.init.mk>
   73 # Grab all the options for a kernel build. For backwards compat, we need to
   74 # do this after bsd.own.mk.
   75 .include "kern.opts.mk"
   76 .include <bsd.compiler.mk>
   77 .include "config.mk"
   78 
   79 # Search for kernel source tree in standard places.
   80 .for _dir in ${.CURDIR}/../.. ${.CURDIR}/../../.. /sys /usr/src/sys
   81 .if !defined(SYSDIR) && exists(${_dir}/kern/)
   82 SYSDIR= ${_dir:tA}
   83 .endif
   84 .endfor
   85 .if !defined(SYSDIR) || !exists(${SYSDIR}/kern/)
   86 .error "can't find kernel source tree"
   87 .endif
   88 
   89 .SUFFIXES: .out .o .c .cc .cxx .C .y .l .s .S .m
   90 
   91 # amd64 and mips use direct linking for kmod, all others use shared binaries
   92 .if ${MACHINE_CPUARCH} != amd64 && ${MACHINE_CPUARCH} != mips
   93 __KLD_SHARED=yes
   94 .else
   95 __KLD_SHARED=no
   96 .endif
   97 
   98 .if !empty(CFLAGS:M-O[23s]) && empty(CFLAGS:M-fno-strict-aliasing)
   99 CFLAGS+=        -fno-strict-aliasing
  100 .endif
  101 WERROR?=        -Werror
  102 CFLAGS+=        ${WERROR}
  103 CFLAGS+=        -D_KERNEL
  104 CFLAGS+=        -DKLD_MODULE
  105 
  106 # Don't use any standard or source-relative include directories.
  107 NOSTDINC=       -nostdinc
  108 CFLAGS:=        ${CFLAGS:N-I*} ${NOSTDINC} ${INCLMAGIC} ${CFLAGS:M-I*}
  109 .if defined(KERNBUILDDIR)
  110 CFLAGS+=        -DHAVE_KERNEL_OPTION_HEADERS -include ${KERNBUILDDIR}/opt_global.h
  111 .endif
  112 
  113 # Add -I paths for system headers.  Individual module makefiles don't
  114 # need any -I paths for this.  Similar defaults for .PATH can't be
  115 # set because there are no standard paths for non-headers.
  116 CFLAGS+=        -I. -I${SYSDIR}
  117 
  118 CFLAGS.gcc+=    -finline-limit=${INLINE_LIMIT}
  119 CFLAGS.gcc+=    -fms-extensions
  120 CFLAGS.gcc+= --param inline-unit-growth=100
  121 CFLAGS.gcc+= --param large-function-growth=1000
  122 
  123 # Disallow common variables, and if we end up with commons from
  124 # somewhere unexpected, allocate storage for them in the module itself.
  125 CFLAGS+=        -fno-common
  126 LDFLAGS+=       -d -warn-common
  127 
  128 CFLAGS+=        ${DEBUG_FLAGS}
  129 .if ${MACHINE_CPUARCH} == amd64
  130 CFLAGS+=        -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer
  131 .endif
  132 
  133 .if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "riscv"
  134 CFLAGS+=        -fPIC
  135 .endif
  136 
  137 # Temporary workaround for PR 196407, which contains the fascinating details.
  138 # Don't allow clang to use fpu instructions or registers in kernel modules.
  139 .if ${MACHINE_CPUARCH} == arm
  140 .if ${COMPILER_VERSION} < 30800
  141 CFLAGS.clang+=  -mllvm -arm-use-movt=0
  142 .else
  143 CFLAGS.clang+=  -mno-movt
  144 .endif
  145 CFLAGS.clang+=  -mfpu=none
  146 CFLAGS+=        -funwind-tables
  147 .endif
  148 
  149 .if ${MACHINE_CPUARCH} == powerpc
  150 CFLAGS+=        -mlongcall -fno-omit-frame-pointer
  151 .endif
  152 
  153 .if ${MACHINE_CPUARCH} == mips
  154 CFLAGS+=        -G0 -fno-pic -mno-abicalls -mlong-calls
  155 .endif
  156 
  157 .if defined(DEBUG) || defined(DEBUG_FLAGS)
  158 CTFFLAGS+=      -g
  159 .endif
  160 
  161 .if defined(FIRMWS)
  162 ${KMOD:S/$/.c/}: ${SYSDIR}/tools/fw_stub.awk
  163         ${AWK} -f ${SYSDIR}/tools/fw_stub.awk ${FIRMWS} -m${KMOD} -c${KMOD:S/$/.c/g} \
  164             ${FIRMWARE_LICENSE:C/.+/-l/}${FIRMWARE_LICENSE}
  165 
  166 SRCS+=  ${KMOD:S/$/.c/}
  167 CLEANFILES+=    ${KMOD:S/$/.c/}
  168 
  169 .for _firmw in ${FIRMWS}
  170 ${_firmw:C/\:.*$/.fwo/:T}:      ${_firmw:C/\:.*$//}
  171         @${ECHO} ${_firmw:C/\:.*$//} ${.ALLSRC:M*${_firmw:C/\:.*$//}}
  172         @if [ -e ${_firmw:C/\:.*$//} ]; then                    \
  173                 ${LD} -b binary --no-warn-mismatch ${_LDFLAGS}  \
  174                     -m ${LD_EMULATION} -r -d                    \
  175                     -o ${.TARGET} ${_firmw:C/\:.*$//};          \
  176         else                                                    \
  177                 ln -s ${.ALLSRC:M*${_firmw:C/\:.*$//}} ${_firmw:C/\:.*$//}; \
  178                 ${LD} -b binary --no-warn-mismatch ${_LDFLAGS}  \
  179                     -m ${LD_EMULATION} -r -d                    \
  180                     -o ${.TARGET} ${_firmw:C/\:.*$//};          \
  181                 rm ${_firmw:C/\:.*$//};                         \
  182         fi
  183 
  184 OBJS+=  ${_firmw:C/\:.*$/.fwo/:T}
  185 .endfor
  186 .endif
  187 
  188 # Conditionally include SRCS based on kernel config options.
  189 .for _o in ${KERN_OPTS}
  190 SRCS+=${SRCS.${_o}}
  191 .endfor
  192 
  193 OBJS+=  ${SRCS:N*.h:R:S/$/.o/g}
  194 
  195 .if !defined(PROG)
  196 PROG=   ${KMOD}.ko
  197 .endif
  198 
  199 .if !defined(DEBUG_FLAGS)
  200 FULLPROG=       ${PROG}
  201 .else
  202 FULLPROG=       ${PROG}.full
  203 ${PROG}: ${FULLPROG} ${PROG}.debug
  204         ${OBJCOPY} --strip-debug --add-gnu-debuglink=${PROG}.debug \
  205             ${FULLPROG} ${.TARGET}
  206 ${PROG}.debug: ${FULLPROG}
  207         ${OBJCOPY} --only-keep-debug ${FULLPROG} ${.TARGET}
  208 .endif
  209 
  210 .if ${__KLD_SHARED} == yes
  211 ${FULLPROG}: ${KMOD}.kld
  212 .if ${MACHINE_CPUARCH} != "aarch64"
  213         ${LD} -Bshareable ${_LDFLAGS} -o ${.TARGET} ${KMOD}.kld
  214 .else
  215 #XXXKIB Relocatable linking in aarch64 ld from binutils 2.25.1 does
  216 #       not work.  The linker corrupts the references to the external
  217 #       symbols which are defined by other object in the linking set
  218 #       and should therefore loose the GOT entry.  The problem seems
  219 #       to be fixed in the binutils-gdb git HEAD as of 2015-10-04.  Hack
  220 #       below allows to get partially functioning modules for now.
  221         ${LD} -Bshareable ${_LDFLAGS} -o ${.TARGET} ${OBJS}
  222 .endif
  223 .if !defined(DEBUG_FLAGS)
  224         ${OBJCOPY} --strip-debug ${.TARGET}
  225 .endif
  226 .endif
  227 
  228 EXPORT_SYMS?=   NO
  229 .if ${EXPORT_SYMS} != YES
  230 CLEANFILES+=    export_syms
  231 .endif
  232 
  233 .if ${__KLD_SHARED} == yes
  234 ${KMOD}.kld: ${OBJS}
  235 .else
  236 ${FULLPROG}: ${OBJS}
  237 .endif
  238         ${LD} ${_LDFLAGS} -r -d -o ${.TARGET} ${OBJS}
  239 .if ${MK_CTF} != "no"
  240         ${CTFMERGE} ${CTFFLAGS} -o ${.TARGET} ${OBJS}
  241 .endif
  242 .if defined(EXPORT_SYMS)
  243 .if ${EXPORT_SYMS} != YES
  244 .if ${EXPORT_SYMS} == NO
  245         :> export_syms
  246 .elif !exists(${.CURDIR}/${EXPORT_SYMS})
  247         echo ${EXPORT_SYMS} > export_syms
  248 .else
  249         grep -v '^#' < ${EXPORT_SYMS} > export_syms
  250 .endif
  251         ${AWK} -f ${SYSDIR}/conf/kmod_syms.awk ${.TARGET} \
  252             export_syms | xargs -J% ${OBJCOPY} % ${.TARGET}
  253 .endif
  254 .endif
  255 .if !defined(DEBUG_FLAGS) && ${__KLD_SHARED} == no
  256         ${OBJCOPY} --strip-debug ${.TARGET}
  257 .endif
  258 
  259 _ILINKS=machine
  260 .if ${MACHINE} != ${MACHINE_CPUARCH} && ${MACHINE} != "arm64"
  261 _ILINKS+=${MACHINE_CPUARCH}
  262 .endif
  263 .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
  264 _ILINKS+=x86
  265 .endif
  266 CLEANFILES+=${_ILINKS}
  267 
  268 all: ${PROG}
  269 
  270 beforedepend: ${_ILINKS}
  271 beforebuild: ${_ILINKS}
  272 
  273 # Ensure that the links exist without depending on it when it exists which
  274 # causes all the modules to be rebuilt when the directory pointed to changes.
  275 .for _link in ${_ILINKS}
  276 .if !exists(${.OBJDIR}/${_link})
  277 OBJS_DEPEND_GUESS+=     ${_link}
  278 .endif
  279 .endfor
  280 
  281 .NOPATH: ${_ILINKS}
  282 
  283 ${_ILINKS}:
  284         @case ${.TARGET} in \
  285         machine) \
  286                 path=${SYSDIR}/${MACHINE}/include ;; \
  287         *) \
  288                 path=${SYSDIR}/${.TARGET:T}/include ;; \
  289         esac ; \
  290         path=`(cd $$path && /bin/pwd)` ; \
  291         ${ECHO} ${.TARGET:T} "->" $$path ; \
  292         ln -fhs $$path ${.TARGET:T}
  293 
  294 CLEANFILES+= ${PROG} ${KMOD}.kld ${OBJS}
  295 
  296 .if defined(DEBUG_FLAGS)
  297 CLEANFILES+= ${FULLPROG} ${PROG}.debug
  298 .endif
  299 
  300 .if !target(install)
  301 
  302 _INSTALLFLAGS:= ${INSTALLFLAGS}
  303 .for ie in ${INSTALLFLAGS_EDIT}
  304 _INSTALLFLAGS:= ${_INSTALLFLAGS${ie}}
  305 .endfor
  306 
  307 .if !target(realinstall)
  308 KERN_DEBUGDIR?= ${DEBUGDIR}
  309 realinstall: _kmodinstall
  310 .ORDER: beforeinstall _kmodinstall
  311 _kmodinstall: .PHONY
  312         ${INSTALL} -T release -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
  313             ${_INSTALLFLAGS} ${PROG} ${DESTDIR}${KMODDIR}/
  314 .if defined(DEBUG_FLAGS) && !defined(INSTALL_NODEBUG) && ${MK_KERNEL_SYMBOLS} != "no"
  315         ${INSTALL} -T debug -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
  316             ${_INSTALLFLAGS} ${PROG}.debug ${DESTDIR}${KERN_DEBUGDIR}${KMODDIR}/
  317 .endif
  318 
  319 .include <bsd.links.mk>
  320 
  321 .if !defined(NO_XREF)
  322 afterinstall: _kldxref
  323 .ORDER: realinstall _kldxref
  324 .ORDER: _installlinks _kldxref
  325 _kldxref: .PHONY
  326         @if type kldxref >/dev/null 2>&1; then \
  327                 ${ECHO} kldxref ${DESTDIR}${KMODDIR}; \
  328                 kldxref ${DESTDIR}${KMODDIR}; \
  329         fi
  330 .endif
  331 .endif # !target(realinstall)
  332 
  333 .endif # !target(install)
  334 
  335 .if !target(load)
  336 load: ${PROG} .PHONY
  337         ${KMODLOAD} -v ${.OBJDIR}/${PROG}
  338 .endif
  339 
  340 .if !target(unload)
  341 unload: .PHONY
  342         if ${KMODISLOADED} ${PROG} ; then ${KMODUNLOAD} -v ${PROG} ; fi
  343 .endif
  344 
  345 .if !target(reload)
  346 reload: unload load .PHONY
  347 .endif
  348 
  349 .if defined(KERNBUILDDIR)
  350 .PATH: ${KERNBUILDDIR}
  351 CFLAGS+=        -I${KERNBUILDDIR}
  352 .for _src in ${SRCS:Mopt_*.h}
  353 CLEANFILES+=    ${_src}
  354 .if !target(${_src})
  355 ${_src}:
  356         ln -sf ${KERNBUILDDIR}/${_src} ${.TARGET}
  357 .endif
  358 .endfor
  359 .else
  360 .for _src in ${SRCS:Mopt_*.h}
  361 CLEANFILES+=    ${_src}
  362 .if !target(${_src})
  363 ${_src}:
  364         :> ${.TARGET}
  365 .endif
  366 .endfor
  367 .endif
  368 
  369 # Respect configuration-specific C flags.
  370 CFLAGS+=        ${CONF_CFLAGS}
  371 
  372 .if !empty(SRCS:Mvnode_if.c)
  373 CLEANFILES+=    vnode_if.c
  374 vnode_if.c: ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src
  375         ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -c
  376 .endif
  377 
  378 .if !empty(SRCS:Mvnode_if.h)
  379 CLEANFILES+=    vnode_if.h vnode_if_newproto.h vnode_if_typedef.h
  380 vnode_if.h vnode_if_newproto.h vnode_if_typedef.h: ${SYSDIR}/tools/vnode_if.awk \
  381     ${SYSDIR}/kern/vnode_if.src
  382 vnode_if.h: vnode_if_newproto.h vnode_if_typedef.h
  383         ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -h
  384 vnode_if_newproto.h:
  385         ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -p
  386 vnode_if_typedef.h:
  387         ${AWK} -f ${SYSDIR}/tools/vnode_if.awk ${SYSDIR}/kern/vnode_if.src -q
  388 .endif
  389 
  390 # Build _if.[ch] from _if.m, and clean them when we're done.
  391 # __MPATH defined in config.mk
  392 _MFILES=${__MPATH:T:O}
  393 _MPATH=${__MPATH:H:O:u}
  394 .PATH.m: ${_MPATH}
  395 .for _i in ${SRCS:M*_if.[ch]}
  396 _MATCH=M${_i:R:S/$/.m/}
  397 _MATCHES=${_MFILES:${_MATCH}}
  398 .if !empty(_MATCHES)
  399 CLEANFILES+=    ${_i}
  400 .endif
  401 .endfor # _i
  402 .m.c:   ${SYSDIR}/tools/makeobjops.awk
  403         ${AWK} -f ${SYSDIR}/tools/makeobjops.awk ${.IMPSRC} -c
  404 
  405 .m.h:   ${SYSDIR}/tools/makeobjops.awk
  406         ${AWK} -f ${SYSDIR}/tools/makeobjops.awk ${.IMPSRC} -h
  407 
  408 .for _i in mii pccard
  409 .if !empty(SRCS:M${_i}devs.h)
  410 CLEANFILES+=    ${_i}devs.h
  411 ${_i}devs.h: ${SYSDIR}/tools/${_i}devs2h.awk ${SYSDIR}/dev/${_i}/${_i}devs
  412         ${AWK} -f ${SYSDIR}/tools/${_i}devs2h.awk ${SYSDIR}/dev/${_i}/${_i}devs
  413 .endif
  414 .endfor # _i
  415 
  416 .if !empty(SRCS:Mbhnd_nvram_map.h)
  417 CLEANFILES+=    bhnd_nvram_map.h
  418 bhnd_nvram_map.h: ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.awk \
  419     ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
  420     ${SYSDIR}/dev/bhnd/nvram/nvram_map
  421 bhnd_nvram_map.h:
  422         sh ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
  423             ${SYSDIR}/dev/bhnd/nvram/nvram_map -h
  424 .endif
  425 
  426 .if !empty(SRCS:Mbhnd_nvram_map_data.h)
  427 CLEANFILES+=    bhnd_nvram_map_data.h
  428 bhnd_nvram_map_data.h: ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.awk \
  429     ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
  430     ${SYSDIR}/dev/bhnd/nvram/nvram_map
  431 bhnd_nvram_map_data.h:
  432         sh ${SYSDIR}/dev/bhnd/tools/nvram_map_gen.sh \
  433             ${SYSDIR}/dev/bhnd/nvram/nvram_map -d
  434 .endif
  435 
  436 .if !empty(SRCS:Musbdevs.h)
  437 CLEANFILES+=    usbdevs.h
  438 usbdevs.h: ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs
  439         ${AWK} -f ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs -h
  440 .endif
  441 
  442 .if !empty(SRCS:Musbdevs_data.h)
  443 CLEANFILES+=    usbdevs_data.h
  444 usbdevs_data.h: ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs
  445         ${AWK} -f ${SYSDIR}/tools/usbdevs2h.awk ${SYSDIR}/dev/usb/usbdevs -d
  446 .endif
  447 
  448 .if !empty(SRCS:Macpi_quirks.h)
  449 CLEANFILES+=    acpi_quirks.h
  450 acpi_quirks.h: ${SYSDIR}/tools/acpi_quirks2h.awk ${SYSDIR}/dev/acpica/acpi_quirks
  451         ${AWK} -f ${SYSDIR}/tools/acpi_quirks2h.awk ${SYSDIR}/dev/acpica/acpi_quirks
  452 .endif
  453 
  454 .if !empty(SRCS:Massym.s) || !empty(DPSRCS:Massym.s)
  455 CLEANFILES+=    assym.s genassym.o
  456 DEPENDOBJS+=    genassym.o
  457 assym.s: genassym.o
  458 .if defined(KERNBUILDDIR)
  459 genassym.o: opt_global.h
  460 .endif
  461 assym.s: ${SYSDIR}/kern/genassym.sh
  462         sh ${SYSDIR}/kern/genassym.sh genassym.o > ${.TARGET}
  463 genassym.o: ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
  464 genassym.o: ${SRCS:Mopt_*.h}
  465         ${CC} -c ${CFLAGS:N-flto:N-fno-common} \
  466             ${SYSDIR}/${MACHINE}/${MACHINE}/genassym.c
  467 .endif
  468 
  469 lint: ${SRCS}
  470         ${LINT} ${LINTKERNFLAGS} ${CFLAGS:M-[DILU]*} ${.ALLSRC:M*.c}
  471 
  472 .if defined(KERNBUILDDIR)
  473 ${OBJS}: opt_global.h
  474 .endif
  475 
  476 CLEANDEPENDFILES+=      ${_ILINKS}
  477 # .depend needs include links so we remove them only together.
  478 cleanilinks:
  479         rm -f ${_ILINKS}
  480 
  481 OBJS_DEPEND_GUESS+= ${SRCS:M*.h}
  482 
  483 .include <bsd.dep.mk>
  484 .include <bsd.clang-analyze.mk>
  485 .include <bsd.obj.mk>
  486 .include "kern.mk"

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