Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0-only
2
3PHONY := __default
4__default: vmlinux
5
6include include/config/auto.conf
7include $(srctree)/scripts/Kbuild.include
8include $(srctree)/scripts/Makefile.lib
9
10targets :=
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
21quiet_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
39quiet_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
46targets += .builtin-dtbs-list
47
48ifdef CONFIG_GENERIC_BUILTIN_DTB
49targets += .builtin-dtbs.S .builtin-dtbs.o
50vmlinux.unstripped: .builtin-dtbs.o
51endif
52
53# vmlinux.unstripped
54# ---------------------------------------------------------------------------
55
56ifdef CONFIG_ARCH_WANTS_PRE_LINK_VMLINUX
57vmlinux.unstripped: arch/$(SRCARCH)/tools/vmlinux.arch.o
58
59arch/$(SRCARCH)/tools/vmlinux.arch.o: vmlinux.o FORCE
60 $(Q)$(MAKE) $(build)=arch/$(SRCARCH)/tools $@
61endif
62
63ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
64
65# Final link of vmlinux with optional arch pass after final link
66cmd_link_vmlinux = \
67 $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)" "$@"; \
68 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
69
70targets += vmlinux.unstripped .vmlinux.export.o
71vmlinux.unstripped: scripts/link-vmlinux.sh vmlinux.o .vmlinux.export.o $(KBUILD_LDS) FORCE
72 +$(call if_changed_dep,link_vmlinux)
73ifdef CONFIG_DEBUG_INFO_BTF
74vmlinux.unstripped: $(RESOLVE_BTFIDS)
75endif
76
77ifdef CONFIG_BUILDTIME_TABLE_SORT
78vmlinux.unstripped: scripts/sorttable
79endif
80
81# vmlinux
82# ---------------------------------------------------------------------------
83
84remove-section-y := .modinfo
85remove-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
88remove-section-$(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS) += '.rel.*'
89
90remove-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.
94quiet_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
98targets += vmlinux
99vmlinux: 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.
114quiet_cmd_modules_builtin_modinfo = GEN $@
115 cmd_modules_builtin_modinfo = $(cmd_objcopy); \
116 sed -i 's/\x00\+$$/\x00/g' $@
117
118OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary
119
120targets += modules.builtin.modinfo
121modules.builtin.modinfo: vmlinux.unstripped FORCE
122 $(call if_changed,modules_builtin_modinfo)
123
124# modules.builtin
125# ---------------------------------------------------------------------------
126
127__default: modules.builtin
128
129# The second line aids cases where multiple modules share the same object.
130
131quiet_cmd_modules_builtin = GEN $@
132 cmd_modules_builtin = \
133 tr '\0' '\n' < $< | \
134 sed -n 's/^[[:alnum:]:_]*\.file=//p' | \
135 tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@
136
137targets += modules.builtin
138modules.builtin: modules.builtin.modinfo FORCE
139 $(call if_changed,modules_builtin)
140
141# modules.builtin.ranges
142# ---------------------------------------------------------------------------
143ifdef CONFIG_BUILTIN_MODULE_RANGES
144__default: modules.builtin.ranges
145
146quiet_cmd_modules_builtin_ranges = GEN $@
147 cmd_modules_builtin_ranges = gawk -f $(real-prereqs) > $@
148
149targets += modules.builtin.ranges
150modules.builtin.ranges: $(srctree)/scripts/generate_builtin_ranges.awk \
151 modules.builtin vmlinux.map vmlinux.o.map FORCE
152 $(call if_changed,modules_builtin_ranges)
153
154vmlinux.map: vmlinux.unstripped
155 @:
156
157endif
158
159# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
160# ---------------------------------------------------------------------------
161
162PHONY += FORCE
163FORCE:
164
165# Read all saved command lines and dependencies for the $(targets) we
166# may be building above, using $(if_changed{,_dep}). As an
167# optimization, we don't need to read them if the target does not
168# exist, we will rebuild anyway in that case.
169
170existing-targets := $(wildcard $(sort $(targets)))
171
172-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
173
174.PHONY: $(PHONY)