scripts/Makefile.vmlinux

   1 # SPDX-License-Identifier: GPL-2.0-only
   2
   3 PHONY := __default
   4 __default: vmlinux
   5
   6 include include/config/auto.conf
   7 include $(srctree)/scripts/Kbuild.include
   8 include $(srctree)/scripts/Makefile.lib
   9
  10 targets :=
  11
  12 %.o: %.c FORCE
  13         $(call if_changed_rule,cc_o_c)
  14
  15 %.o: %.S FORCE
  16         $(call if_changed_rule,as_o_S)
  17
  18 # Built-in dtb
  19 # ---------------------------------------------------------------------------
  20
  21 quiet_cmd_wrap_dtbs = WRAP    $@
  22       cmd_wrap_dtbs = {                                                 \
  23         echo '\#include <asm-generic/vmlinux.lds.h>';                   \
  24         echo '.section .dtb.init.rodata,"a"';                           \
  25         while read dtb; do                                              \
  26                 symbase=__dtb_$$(basename -s .dtb "$${dtb}" | tr - _);  \
  27                 echo '.balign STRUCT_ALIGNMENT';                        \
  28                 echo ".global $${symbase}_begin";                       \
  29                 echo "$${symbase}_begin:";                              \
  30                 echo '.incbin "'$$dtb'" ';                              \
  31                 echo ".global $${symbase}_end";                         \
  32                 echo "$${symbase}_end:";                                \
  33         done < $<;                                                      \
  34         } > $@
  35
  36 .builtin-dtbs.S: .builtin-dtbs-list FORCE
  37         $(call if_changed,wrap_dtbs)
  38
  39 quiet_cmd_gen_dtbs_list = GEN     $@
  40       cmd_gen_dtbs_list = \
  41         $(if $(CONFIG_BUILTIN_DTB_NAME), echo "arch/$(SRCARCH)/boot/dts/$(CONFIG_BUILTIN_DTB_NAME).dtb",:) > $@
  42
  43 .builtin-dtbs-list: arch/$(SRCARCH)/boot/dts/dtbs-list FORCE
  44         $(call if_changed,$(if $(CONFIG_BUILTIN_DTB_ALL),copy,gen_dtbs_list))
  45
  46 targets += .builtin-dtbs-list
  47
  48 ifdef CONFIG_GENERIC_BUILTIN_DTB
  49 targets += .builtin-dtbs.S .builtin-dtbs.o
  50 vmlinux.unstripped: .builtin-dtbs.o
  51 endif
  52
  53 # vmlinux.unstripped
  54 # ---------------------------------------------------------------------------
  55
  56 ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX
  57 vmlinux.unstripped: arch/$(SRCARCH)/tools/vmlinux.arch.o
  58
  59 arch/$(SRCARCH)/tools/vmlinux.arch.o: vmlinux.o FORCE
  60         $(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools $@
  61 endif
  62
  63 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
  64
  65 # Final link of vmlinux with optional arch pass after final link
  66 cmd_link_vmlinux =                                                      \
  67         $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)" "$@";       \
  68         $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
  69
  70 targets += vmlinux.unstripped .vmlinux.export.o
  71 vmlinux.unstripped: scripts/link-vmlinux.sh vmlinux.o .vmlinux.export.o $(KBUILD_LDS) FORCE
  72         +$(call if_changed_dep,link_vmlinux)
  73 ifdef CONFIG_DEBUG_INFO_BTF
  74 vmlinux.unstripped: $(RESOLVE_BTFIDS) $(srctree)/scripts/gen-btf.sh
  75 endif
  76
  77 ifdef CONFIG_BUILDTIME_TABLE_SORT
  78 vmlinux.unstripped: scripts/sorttable
  79 endif
  80
  81 # vmlinux
  82 # ---------------------------------------------------------------------------
  83
  84 remove-section-y                                   := .modinfo
  85 remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel*' '!.rel*.dyn'
  86 # for compatibility with binutils < 2.32
  87 # https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c12d9fa2afe7abcbe407a00e15719e1a1350c2a7
  88 remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel.*'
  89
  90 remove-symbols := -w --strip-unneeded-symbol='__mod_device_table__*'
  91
  92 # To avoid warnings: "empty loadable segment detected at ..." from GNU objcopy,
  93 # it is necessary to remove the PT_LOAD flag from the segment.
  94 quiet_cmd_strip_relocs = OBJCOPY $@
  95       cmd_strip_relocs = $(OBJCOPY) $(patsubst %,--set-section-flags %=noload,$(remove-section-y)) $< $@; \
  96                          $(OBJCOPY) $(addprefix --remove-section=,$(remove-section-y)) $(remove-symbols) $@
  97
  98 targets += vmlinux
  99 vmlinux: vmlinux.unstripped FORCE
 100         $(call if_changed,strip_relocs)
 101
 102 # modules.builtin.modinfo
 103 # ---------------------------------------------------------------------------
 104
 105 # .modinfo in vmlinux.unstripped is aligned to 8 bytes for compatibility with
 106 # tools that expect vmlinux to have sufficiently aligned sections but the
 107 # additional bytes used for padding .modinfo to satisfy this requirement break
 108 # certain versions of kmod with
 109 #
 110 #   depmod: ERROR: kmod_builtin_iter_next: unexpected string without modname prefix
 111 #
 112 # Strip the trailing padding bytes after extracting .modinfo to comply with
 113 # what kmod expects to parse.
 114 quiet_cmd_modules_builtin_modinfo = GEN     $@
 115       cmd_modules_builtin_modinfo = $(cmd_objcopy); \
 116                                     sed -i 's/\x00\+$$/\x00/g' $@; \
 117                                     chmod -x $@
 118
 119 OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
 120
 121 targets += modules.builtin.modinfo
 122 modules.builtin.modinfo: vmlinux.unstripped FORCE
 123         $(call if_changed,modules_builtin_modinfo)
 124
 125 # modules.builtin
 126 # ---------------------------------------------------------------------------
 127
 128 __default: modules.builtin
 129
 130 # The second line aids cases where multiple modules share the same object.
 131
 132 quiet_cmd_modules_builtin = GEN     $@
 133       cmd_modules_builtin = \
 134         tr '\0' '\n' < $< | \
 135         sed -n 's/^[[:alnum:]:_]*\.file=//p' | \
 136         tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@
 137
 138 targets += modules.builtin
 139 modules.builtin: modules.builtin.modinfo FORCE
 140         $(call if_changed,modules_builtin)
 141
 142 # modules.builtin.ranges
 143 # ---------------------------------------------------------------------------
 144 ifdef CONFIG_BUILTIN_MODULE_RANGES
 145 __default: modules.builtin.ranges
 146
 147 quiet_cmd_modules_builtin_ranges = GEN     $@
 148       cmd_modules_builtin_ranges = gawk -f $(real-prereqs) > $@
 149
 150 targets += modules.builtin.ranges
 151 modules.builtin.ranges: $(srctree)/scripts/generate_builtin_ranges.awk \
 152                         modules.builtin vmlinux.map vmlinux.o.map FORCE
 153         $(call if_changed,modules_builtin_ranges)
 154
 155 vmlinux.map: vmlinux.unstripped
 156         @:
 157
 158 endif
 159
 160 # Add FORCE to the prerequisites of a target to force it to be always rebuilt.
 161 # ---------------------------------------------------------------------------
 162
 163 PHONY += FORCE
 164 FORCE:
 165
 166 # Read all saved command lines and dependencies for the $(targets) we
 167 # may be building above, using $(if_changed{,_dep}). As an
 168 # optimization, we don't need to read them if the target does not
 169 # exist, we will rebuild anyway in that case.
 170
 171 existing-targets := $(wildcard $(sort $(targets)))
 172
 173 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
 174
 175 .PHONY: $(PHONY)