scripts/Makefile.vmlinux_o

   1 # SPDX-License-Identifier: GPL-2.0-only
   2
   3 PHONY := __default
   4 __default: vmlinux.o modules.builtin.modinfo modules.builtin
   5
   6 include include/config/auto.conf
   7 include $(srctree)/scripts/Kbuild.include
   8
   9 # for objtool
  10 include $(srctree)/scripts/Makefile.lib
  11
  12 # Generate a linker script to ensure correct ordering of initcalls for Clang LTO
  13 # ---------------------------------------------------------------------------
  14
  15 quiet_cmd_gen_initcalls_lds = GEN     $@
  16       cmd_gen_initcalls_lds = \
  17         $(PYTHON3) $(srctree)/scripts/jobserver-exec \
  18         $(PERL) $(real-prereqs) > $@
  19
  20 .tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
  21                 vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
  22         $(call if_changed,gen_initcalls_lds)
  23
  24 targets := .tmp_initcalls.lds
  25
  26 ifdef CONFIG_LTO_CLANG
  27 initcalls-lds := .tmp_initcalls.lds
  28 endif
  29
  30 # objtool for vmlinux.o
  31 # ---------------------------------------------------------------------------
  32 #
  33 # For LTO and IBT, objtool doesn't run on individual translation units.
  34 # Run everything on vmlinux instead.
  35
  36 objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
  37
  38 vmlinux-objtool-args-$(delay-objtool)                   += $(objtool-args-y)
  39 vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL)              += --no-unreachable
  40 vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION)       += --noinstr \
  41                                                            $(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
  42
  43 objtool-args = $(vmlinux-objtool-args-y) --link
  44
  45 # Link of vmlinux.o used for section mismatch analysis
  46 # ---------------------------------------------------------------------------
  47
  48 quiet_cmd_ld_vmlinux.o = LD      $@
  49       cmd_ld_vmlinux.o = \
  50         $(LD) ${KBUILD_LDFLAGS} -r -o $@ \
  51         $(addprefix -T , $(initcalls-lds)) \
  52         --whole-archive vmlinux.a --no-whole-archive \
  53         --start-group $(KBUILD_VMLINUX_LIBS) --end-group \
  54         $(cmd_objtool)
  55
  56 define rule_ld_vmlinux.o
  57         $(call cmd_and_savecmd,ld_vmlinux.o)
  58         $(call cmd,gen_objtooldep)
  59 endef
  60
  61 vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
  62         $(call if_changed_rule,ld_vmlinux.o)
  63
  64 targets += vmlinux.o
  65
  66 # module.builtin.modinfo
  67 # ---------------------------------------------------------------------------
  68
  69 OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
  70
  71 targets += modules.builtin.modinfo
  72 modules.builtin.modinfo: vmlinux.o FORCE
  73         $(call if_changed,objcopy)
  74
  75 # module.builtin
  76 # ---------------------------------------------------------------------------
  77
  78 # The second line aids cases where multiple modules share the same object.
  79
  80 quiet_cmd_modules_builtin = GEN     $@
  81       cmd_modules_builtin = \
  82         tr '\0' '\n' < $< | \
  83         sed -n 's/^[[:alnum:]:_]*\.file=//p' | \
  84         tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@
  85
  86 targets += modules.builtin
  87 modules.builtin: modules.builtin.modinfo FORCE
  88         $(call if_changed,modules_builtin)
  89
  90 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
  91 # ---------------------------------------------------------------------------
  92
  93 PHONY += FORCE
  94 FORCE:
  95
  96 # Read all saved command lines and dependencies for the $(targets) we
  97 # may be building above, using $(if_changed{,_dep}). As an
  98 # optimization, we don't need to read them if the target does not
  99 # exist, we will rebuild anyway in that case.
 100
 101 existing-targets := $(wildcard $(sort $(targets)))
 102
 103 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 104
 105 .PHONY: $(PHONY)