Makefile.ksplice

   1 ksplice-makefile := $(word $(words $(MAKEFILE_LIST)), $(MAKEFILE_LIST))
   2 ksplice-script = $(dir $(ksplice-makefile))ksplice-obj.pl
   3
   4 KSPLICE_MODE ?= diff
   5 $(if $(filter_out snap diff revert modinst,$(KSPLICE_MODE)), \
   6   $(error Invalid KSPLICE_MODE $(KSPLICE_MODE).))
   7
   8 KSPLICE_ONLY_TARGETS ?= %
   9
  10 PHONY :=
  11
  12 __ksplice:
  13
  14 ksplice-extra = $(filter-out $(KSPLICE_EXCLUDE_MATCH),$(filter $(KSPLICE_EXTRA_MATCH),$(lib-y) $(real-objs-m) $(real-objs-y)))
  15 ksplice-objs = $(foreach o,$(1),$(o:=.KSPLICE) $(addsuffix .KSPLICE_old_code,$(filter $(ksplice-extra),$(o))))
  16
  17 escsq ?= $(subst ','\'',$(1))
  18 echo-cmd ?= $(if $($(quiet)cmd_$(1)),echo '  $(call escsq,$($(quiet)cmd_$(1)))';)
  19
  20 quiet_cmd_ksplice-combine = COMBINE $(@:.KSPLICE=)
  21 cmd_ksplice-combine = $(ksplice-script) combine $@ $(filter $(call ksplice-objs,$(ksplice-link-deps)),$^)
  22 quiet_cmd_ksplice-snap = SNAP    $(@:.KSPLICE=)
  23 cmd_ksplice-snap = $(ksplice-script) snap $@
  24 quiet_cmd_ksplice-diff = DIFF    $(@:.KSPLICE=)
  25 cmd_ksplice-diff = $(ksplice-script) diff $@
  26 quiet_cmd_ksplice-ignore = IGNORE  $(@:.KSPLICE=)
  27 cmd_ksplice-ignore = touch $@
  28 quiet_cmd_ksplice-cow = COW     $@
  29 cmd_ksplice-cow = cp -a $@ $@.KSPLICE_pre
  30 quiet_cmd_ksplice-mod = MOD     $(@:$(KSPLICE_KMODSRC)/%.mod.KSPLICE=%)
  31 cmd_ksplice-mod = echo $(<:.o.KSPLICE=) > $@; cp -a $< $(<:.KSPLICE=.KSPLICE_new_code) $(<:.KSPLICE=.KSPLICE_old_code) $(KSPLICE_KMODSRC)/
  32 rule_ksplice-mod = if [ -s $< ]; then $(echo-cmd) $(cmd_$(1)); fi
  33 quiet_cmd_ksplice-old-code = OLDCODE $(@:.KSPLICE_old_code=)
  34 cmd_ksplice-old-code = $(ksplice-script) old_code $@
  35 quiet_cmd_ksplice-freeze = FREEZE  $(@:_ksplice-revert_%.KSPLICE_pre=%)
  36 cmd_ksplice-freeze = rm -f $(@:_ksplice-revert_%=%)
  37 quiet_cmd_ksplice-revert = REVERT  $(@:_ksplice-revert_%.KSPLICE_pre=%)
  38 cmd_ksplice-revert = touch -r ksplice-revert-stamp $(@:_ksplice-revert_%=%); mv $(@:_ksplice-revert_%=%) $(@:_ksplice-revert_%.KSPLICE_pre=%)
  39 quiet_cmd_ksplice-revert-snap = SNAP    $(@:_ksplice-revert-snap_%.KSPLICE=%)
  40 cmd_ksplice-revert-snap = $(ksplice-script) snap $(@:_ksplice-revert-snap_%=%)
  41 quiet_cmd_ksplice-clean = CLEAN   $(@:_ksplice-clean_%=%)
  42 cmd_ksplice-clean = rm -f $(@:_ksplice-clean_%=%)
  43
  44 ifeq ($(obj),)
  45
  46 ifneq ($(wildcard include/linux/compile.h),)
  47 MAKE += --old-file=include/linux/compile.h
  48 endif
  49 ifneq ($(filter snap diff,$(KSPLICE_MODE)),)
  50 # Makefile.lib must be included before Makefile because they contain
  51 # different filechk definitions in 2.6.12.
  52 include $(if $(KBUILD_SRC),$(KBUILD_SRC)/)scripts/Makefile.lib
  53 endif
  54 include $(if $(KBUILD_SRC),$(KBUILD_SRC)/)Makefile
  55
  56 ifneq ($(skip-makefile),)
  57
  58 PHONY += __ksplice
  59 __ksplice: FORCE
  60         $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
  61         KBUILD_SRC=$(CURDIR) \
  62         KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(ksplice-makefile) \
  63         $(if $(wildcard $(KBUILD_OUTPUT)/include/config/kernel.release),--old-file=include/config/kernel.release)
  64
  65 else    # skip-makefile
  66
  67 CC := ksplice-cc.pl $(CC)
  68 CFLAGS_KSPLICE = -ffunction-sections -fdata-sections -ksplice-cflags-api=1
  69 CFLAGS_KERNEL += $(CFLAGS_KSPLICE)
  70 CFLAGS_MODULE += $(CFLAGS_KSPLICE)
  71
  72 ifeq ($(KSPLICE_MODE),revert)
  73
  74 ksplice-revert-dirs = $(vmlinux-alldirs:%=_ksplice_%)
  75 ksplice-dirs += $(ksplice-revert-dirs)
  76
  77 .INTERMEDIATE $(ksplice-revert-dirs): ksplice-revert-stamp
  78 ksplice-revert-stamp: FORCE
  79         $(Q)touch $@
  80
  81 endif   # KSPLICE_MODE
  82
  83 ifneq ($(filter snap diff,$(KSPLICE_MODE)),)
  84
  85 ksplice-mods += vmlinux
  86 ifdef KSPLICE_BUILD_MODULES
  87 ksplice-deps += ksplice_modpost
  88 endif
  89 ksplice-deps += $(vmlinux-dirs)
  90
  91 ksplice-vmlinux-objs = $(if $(vmlinux-all),$(vmlinux-all),$(vmlinux-objs))
  92 $(obj)/vmlinux.o.KSPLICE: ksplice-link-deps = $(ksplice-vmlinux-objs)
  93 $(obj)/vmlinux.o.KSPLICE: $(call ksplice-objs,$(ksplice-vmlinux-objs)) FORCE
  94         $(call if_changed,ksplice-combine)
  95 ksplice-targets += $(obj)/vmlinux.o.KSPLICE
  96 $(ksplice-vmlinux-objs:=.KSPLICE): $(vmlinux-dirs) ;
  97
  98 PHONY += ksplice_modpost
  99 ksplice_modpost: $(vmlinux-dirs) vmlinux
 100         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
 101
 102 endif   # KSPLICE_MODE
 103
 104 ifeq ($(KSPLICE_MODE),modinst)
 105
 106 ksplice-deps += ksplice_modinst
 107 PHONY += ksplice_modinst
 108 ksplice_modinst:
 109         $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 110
 111 endif   # KSPLICE_MODE
 112
 113 endif   # skip-makefile
 114
 115 else    # obj
 116
 117 ifeq ($(KSPLICE_MODE),revert)
 118
 119 -include .config        # workaround for missing obj- = subdir/ declarations
 120 include $(srctree)/scripts/Makefile.clean
 121 ksplice-dirs += $(subdir-ymn:%=_ksplice_%)
 122
 123 endif   # KSPLICE_MODE
 124
 125 ifneq ($(filter snap diff,$(KSPLICE_MODE)),)
 126
 127 ifdef KSPLICE_BUILD_MODULES
 128 KBUILD_MODULES = 1
 129 endif
 130
 131 include $(srctree)/scripts/Makefile.build
 132 ksplice-mods += $(obj-m:.o=)
 133 ksplice-deps += $(if $(filter $(KSPLICE_ONLY_TARGETS),vmlinux),$(builtin-target:=.KSPLICE) $(lib-target:=.KSPLICE))
 134 ifdef KSPLICE_BUILD_MODULES
 135 ksplice-deps += __build
 136 endif
 137 ksplice-deps += $(subdir-ym) $(always)
 138
 139 ifdef builtin-target
 140 $(builtin-target:=.KSPLICE): ksplice-link-deps = $(obj-y)
 141 $(builtin-target:=.KSPLICE): $(call ksplice-objs,$(obj-y)) FORCE
 142         $(call if_changed,ksplice-combine)
 143 ksplice-targets += $(builtin-target:=.KSPLICE)
 144 endif
 145
 146 ifdef lib-target
 147 $(lib-target:=.KSPLICE): ksplice-link-deps = $(lib-y)
 148 $(lib-target:=.KSPLICE): $(call ksplice-objs,$(lib-y)) FORCE
 149         $(call if_changed,ksplice-combine)
 150 ksplice-targets += $(lib-target:=.KSPLICE)
 151 endif
 152
 153 $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE)): ksplice-link-deps = $($(@:$(obj)/%.o.KSPLICE=%-objs):%=$(obj)/%) $($(@:$(obj)/%.o.KSPLICE=%-y):%=$(obj)/%)
 154 $(sort $(multi-used-y:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-y)) FORCE
 155         $(call if_changed,ksplice-combine)
 156 $(sort $(multi-used-m:=.KSPLICE)): $(obj)/%.o.KSPLICE: $(call ksplice-objs,$(multi-objs-m)) FORCE
 157         $(call if_changed,ksplice-combine)
 158 ksplice-targets += $(sort $(multi-used-y:=.KSPLICE) $(multi-used-m:=.KSPLICE))
 159
 160 ifeq ($(KSPLICE_MODE),snap)
 161 $(obj)/%.o.KSPLICE: $(obj)/%.o FORCE
 162         $(if $(strip $(wildcard $<.KSPLICE_pre) $(filter $<,$?)), \
 163           $(call cmd,ksplice-snap))
 164 else
 165 $(obj)/%.o.KSPLICE: $(obj)/%.o
 166         $(call cmd,ksplice-diff)
 167 endif
 168
 169 $(obj)/%.lds.KSPLICE:
 170         $(call cmd,ksplice-ignore)
 171
 172 $(sort $(subdir-obj-y:=.KSPLICE)): $(subdir-ym) ;
 173
 174 ifeq ($(MAKECMDGOALS),missing-syscalls)
 175 cmd = @:
 176 endif
 177
 178 endif   # KSPLICE_MODE
 179
 180 endif   # obj
 181
 182 ifeq ($(skip-makefile),)
 183
 184 ifeq ($(KSPLICE_MODE),revert)
 185
 186 ksplice-revert-obj := $(wildcard $(obj)/*.KSPLICE_pre)
 187 ksplice-revert-files := $(ksplice-revert-obj)
 188 ifneq ($(obj),$(src))
 189 ksplice-revert-files += $(wildcard $(src)/*.KSPLICE_pre)
 190 endif
 191 ksplice-revert-deps := $(ksplice-revert-files:%=_ksplice-revert_%)
 192 ksplice-deps += $(ksplice-revert-deps)
 193 PHONY += $(ksplice-revert-deps)
 194 $(ksplice-revert-deps): FORCE
 195 ifdef KSPLICE_SERIES
 196         $(call cmd,ksplice-freeze)
 197 else
 198         $(call cmd,ksplice-revert)
 199 endif
 200
 201 ksplice-revert-snap-files := $(wildcard $(ksplice-revert-obj:.KSPLICE_pre=.KSPLICE))
 202 ksplice-revert-snap-deps := $(ksplice-revert-snap-files:%=_ksplice-revert-snap_%)
 203 ksplice-deps += $(ksplice-revert-snap-deps)
 204 PHONY += $(ksplice-revert-snap-deps)
 205 $(ksplice-revert-snap-deps): $(ksplice-revert-snap-files:%.KSPLICE=_ksplice-revert_%.KSPLICE_pre) FORCE
 206         $(call cmd,ksplice-revert-snap)
 207
 208 ksplice-clean-files := $(filter-out $(ksplice-revert-snap-files:.KSPLICE_pre=.KSPLICE_new_code) $(ksplice-revert-snap-files:.KSPLICE_pre=.KSPLICE_old_code),$(wildcard $(obj)/*.KSPLICE_new_code $(obj)/*.KSPLICE_old_code))
 209 ksplice-clean-deps = $(ksplice-clean-files:%=_ksplice-clean_%)
 210 ksplice-deps += $(ksplice-clean-deps)
 211 PHONY += $(ksplice-clean-deps)
 212 $(ksplice-clean-deps): FORCE
 213         $(call cmd,ksplice-clean)
 214
 215 endif   # KSPLICE_MODE
 216
 217 ifneq ($(filter snap diff,$(KSPLICE_MODE)),)
 218
 219 ksplice-modnames = $(filter $(KSPLICE_ONLY_TARGETS),$(notdir $(ksplice-mods)))
 220 ifdef KSPLICE_KMODSRC
 221 ksplice-deps += $(ksplice-modnames:%=$(KSPLICE_KMODSRC)/%.mod.KSPLICE)
 222 $(KSPLICE_KMODSRC)/%.mod.KSPLICE: $(obj)/%.o.KSPLICE
 223         $(Q)$(call rule_ksplice-mod,ksplice-mod)
 224 else
 225 ksplice-deps += $(ksplice-modnames:%=$(obj)/%.o.KSPLICE)
 226 endif
 227 .SECONDARY: $(obj)/%.o.KSPLICE
 228
 229 $(obj)/%.o.KSPLICE_old_code: $(obj)/%.o.KSPLICE
 230         $(call cmd,ksplice-old-code)
 231
 232 ifeq ($(KSPLICE_MODE),diff)
 233
 234 define ksplice-cow-check
 235         $(if $(filter-out %.KSPLICE,$@), \
 236           $(if $(strip $(filter-out $(PHONY),$?) $(filter-out $(cmd_$(1)),$(cmd_$@)) $(filter-out $(cmd_$@),$(cmd_$(1)))), \
 237             $(if $(wildcard $@), \
 238               $(if $(wildcard $@.KSPLICE_pre),, \
 239                 $(call cmd,ksplice-cow)))))
 240
 241 endef
 242
 243 define ksplice-add-cow-check
 244 $(v) = $$(ksplice-cow-check)$(value $(v))
 245
 246 endef
 247
 248 ksplice-cow-eval += $(foreach v,if_changed if_changed_dep if_changed_rule,$(ksplice-add-cow-check))
 249
 250 endif   # KSPLICE_MODE
 251
 252 ksplice-cmd-files := $(wildcard $(foreach f,$(sort $(ksplice-targets)),$(dir $(f)).$(notdir $(f)).cmd))
 253 ifneq ($(ksplice-cmd-files),)
 254 $(ksplice-cmd-files): ;
 255 include $(ksplice-cmd-files)
 256 endif
 257
 258 endif   # KSPLICE_MODE
 259
 260 PHONY += __ksplice
 261 __ksplice: $(ksplice-deps) $(ksplice-dirs)
 262         @:
 263
 264 build := -f $(ksplice-makefile) obj
 265 descend =$(Q)$(MAKE) $(build)=$(1) $(2)
 266
 267 PHONY += $(ksplice-dirs)
 268 $(ksplice-dirs):
 269         $(Q)$(MAKE) $(build)=$(@:_ksplice_%=%)
 270
 271 endif   # skip-makefile
 272
 273 $(eval $(ksplice-cow-eval))
 274
 275 PHONY += FORCE
 276 FORCE:
 277
 278 .PHONY: $(PHONY)