Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
db569afa SR |
2 | # |
3 | # linux/arch/x86/boot/compressed/Makefile | |
4 | # | |
5 | # create a compressed vmlinux image from the original vmlinux | |
6 | # | |
fb7183ef KC |
7 | # vmlinuz is: |
8 | # decompression code (*.o) | |
9 | # asm globals (piggy.S), including: | |
10 | # vmlinux.bin.(gz|bz2|lzma|...) | |
11 | # | |
12 | # vmlinux.bin is: | |
13 | # vmlinux stripped of debugging and comments | |
14 | # vmlinux.bin.all is: | |
15 | # vmlinux.bin + vmlinux.relocs | |
16 | # vmlinux.bin.(gz|bz2|lzma|...) is: | |
17 | # (see scripts/Makefile.lib size_append) | |
18 | # compressed vmlinux.bin.all + u32 size of vmlinux.bin.all | |
db569afa | 19 | |
c0dd6716 JP |
20 | KASAN_SANITIZE := n |
21 | OBJECT_FILES_NON_STANDARD := y | |
ef7f0d6a | 22 | |
5c9a8750 DV |
23 | # Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. |
24 | KCOV_INSTRUMENT := n | |
25 | ||
f9b493ac KL |
26 | targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \ |
27 | vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 | |
db569afa | 28 | |
d6289f36 | 29 | KBUILD_CFLAGS := -m$(BITS) -O2 |
6d92bc9d | 30 | KBUILD_CFLAGS += -fno-strict-aliasing $(call cc-option, -fPIE, -fPIC) |
95a38f34 | 31 | KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING |
17a2a9b5 | 32 | cflags-$(CONFIG_X86_32) := -march=i386 |
db569afa SR |
33 | cflags-$(CONFIG_X86_64) := -mcmodel=small |
34 | KBUILD_CFLAGS += $(cflags-y) | |
8b3b005d | 35 | KBUILD_CFLAGS += -mno-mmx -mno-sse |
db569afa SR |
36 | KBUILD_CFLAGS += $(call cc-option,-ffreestanding) |
37 | KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector) | |
20c6c189 | 38 | KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) |
6c3b56b1 | 39 | KBUILD_CFLAGS += $(call cc-disable-warning, gnu) |
db569afa SR |
40 | |
41 | KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ | |
7bf99fb6 | 42 | GCOV_PROFILE := n |
c6d30853 | 43 | UBSAN_SANITIZE :=n |
db569afa | 44 | |
d503ac53 | 45 | KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE) |
a980ce35 L |
46 | # Compressed kernel should be built as PIE since it may be loaded at any |
47 | # address by the bootloader. | |
6d92bc9d | 48 | ifeq ($(CONFIG_X86_32),y) |
d503ac53 | 49 | KBUILD_LDFLAGS += $(call ld-option, -pie) $(call ld-option, --no-dynamic-linker) |
6d92bc9d L |
50 | else |
51 | # To build 64-bit compressed kernel as PIE, we disable relocation | |
52 | # overflow check to avoid relocation overflow error with a new linker | |
53 | # command-line option, -z noreloc-overflow. | |
d503ac53 | 54 | KBUILD_LDFLAGS += $(shell $(LD) --help 2>&1 | grep -q "\-z noreloc-overflow" \ |
6d92bc9d L |
55 | && echo "-z noreloc-overflow -pie --no-dynamic-linker") |
56 | endif | |
db569afa SR |
57 | LDFLAGS_vmlinux := -T |
58 | ||
02a884c0 | 59 | hostprogs-y := mkpiggy |
12871c56 | 60 | HOST_EXTRACFLAGS += -I$(srctree)/tools/include |
02a884c0 | 61 | |
4abf061b | 62 | sed-voffset := -e 's/^\([0-9a-fA-F]*\) [ABCDGRSTVW] \(_text\|__bss_start\|_end\)$$/\#define VO_\2 _AC(0x\1,UL)/p' |
67b66625 YL |
63 | |
64 | quiet_cmd_voffset = VOFFSET $@ | |
65 | cmd_voffset = $(NM) $< | sed -n $(sed-voffset) > $@ | |
66 | ||
67 | targets += ../voffset.h | |
68 | ||
69 | $(obj)/../voffset.h: vmlinux FORCE | |
70 | $(call if_changed,voffset) | |
71 | ||
72 | $(obj)/misc.o: $(obj)/../voffset.h | |
73 | ||
9a1cb471 | 74 | vmlinux-objs-y := $(obj)/vmlinux.lds $(obj)/head_$(BITS).o $(obj)/misc.o \ |
dc425a6e | 75 | $(obj)/string.o $(obj)/cmdline.o $(obj)/error.o \ |
9e6abd2a JT |
76 | $(obj)/piggy.o $(obj)/cpuflags.o |
77 | ||
3afed06a | 78 | vmlinux-objs-$(CONFIG_EARLY_PRINTK) += $(obj)/early_serial_console.o |
9b238748 | 79 | vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr.o |
3a94707d | 80 | ifdef CONFIG_X86_64 |
7cc4eb1b | 81 | vmlinux-objs-$(CONFIG_RANDOMIZE_BASE) += $(obj)/kaslr_64.o |
1958b5fc | 82 | vmlinux-objs-y += $(obj)/mem_encrypt.o |
08529078 | 83 | vmlinux-objs-y += $(obj)/pgtable_64.o |
3a94707d | 84 | endif |
291f3632 | 85 | |
9dead5bb | 86 | $(obj)/eboot.o: KBUILD_CFLAGS += -fshort-wchar -mno-red-zone |
9dead5bb | 87 | |
243b6754 AB |
88 | vmlinux-objs-$(CONFIG_EFI_STUB) += $(obj)/eboot.o $(obj)/efi_stub_$(BITS).o \ |
89 | $(objtree)/drivers/firmware/efi/libstub/lib.a | |
96738c69 | 90 | vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_thunk_$(BITS).o |
291f3632 | 91 | |
98f78525 KC |
92 | # The compressed kernel is built with -fPIC/-fPIE so that a boot loader |
93 | # can place it anywhere in memory and it will still run. However, since | |
94 | # it is executed as-is without any ELF relocation processing performed | |
95 | # (and has already had all relocation sections stripped from the binary), | |
96 | # none of the code can use data relocations (e.g. static assignments of | |
97 | # pointer values), since they will be meaningless at runtime. This check | |
98 | # will refuse to link the vmlinux if any of these relocations are found. | |
99 | quiet_cmd_check_data_rel = DATAREL $@ | |
100 | define cmd_check_data_rel | |
101 | for obj in $(filter %.o,$^); do \ | |
37805787 | 102 | ${CROSS_COMPILE}readelf -S $$obj | grep -qF .rel.local && { \ |
98f78525 KC |
103 | echo "error: $$obj has data relocations!" >&2; \ |
104 | exit 1; \ | |
105 | } || true; \ | |
106 | done | |
107 | endef | |
108 | ||
92a47286 KC |
109 | # We need to run two commands under "if_changed", so merge them into a |
110 | # single invocation. | |
111 | quiet_cmd_check-and-link-vmlinux = LD $@ | |
112 | cmd_check-and-link-vmlinux = $(cmd_check_data_rel); $(cmd_ld) | |
113 | ||
9a1cb471 | 114 | $(obj)/vmlinux: $(vmlinux-objs-y) FORCE |
92a47286 | 115 | $(call if_changed,check-and-link-vmlinux) |
db569afa | 116 | |
099e1377 | 117 | OBJCOPYFLAGS_vmlinux.bin := -R .comment -S |
db569afa SR |
118 | $(obj)/vmlinux.bin: vmlinux FORCE |
119 | $(call if_changed,objcopy) | |
120 | ||
9a1cb471 | 121 | targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all vmlinux.relocs |
db569afa | 122 | |
6520fe55 | 123 | CMD_RELOCS = arch/x86/tools/relocs |
db569afa | 124 | quiet_cmd_relocs = RELOCS $@ |
6520fe55 PA |
125 | cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $< |
126 | $(obj)/vmlinux.relocs: vmlinux FORCE | |
db569afa SR |
127 | $(call if_changed,relocs) |
128 | ||
129 | vmlinux.bin.all-y := $(obj)/vmlinux.bin | |
5f11e020 | 130 | vmlinux.bin.all-$(CONFIG_X86_NEED_RELOCS) += $(obj)/vmlinux.relocs |
db569afa | 131 | |
5f11e020 | 132 | $(obj)/vmlinux.bin.gz: $(vmlinux.bin.all-y) FORCE |
db569afa | 133 | $(call if_changed,gzip) |
5f11e020 | 134 | $(obj)/vmlinux.bin.bz2: $(vmlinux.bin.all-y) FORCE |
ae03c499 | 135 | $(call if_changed,bzip2) |
5f11e020 | 136 | $(obj)/vmlinux.bin.lzma: $(vmlinux.bin.all-y) FORCE |
ae03c499 | 137 | $(call if_changed,lzma) |
30314804 LC |
138 | $(obj)/vmlinux.bin.xz: $(vmlinux.bin.all-y) FORCE |
139 | $(call if_changed,xzkern) | |
13510997 AT |
140 | $(obj)/vmlinux.bin.lzo: $(vmlinux.bin.all-y) FORCE |
141 | $(call if_changed,lzo) | |
f9b493ac KL |
142 | $(obj)/vmlinux.bin.lz4: $(vmlinux.bin.all-y) FORCE |
143 | $(call if_changed,lz4) | |
db569afa | 144 | |
283ab1c0 PA |
145 | suffix-$(CONFIG_KERNEL_GZIP) := gz |
146 | suffix-$(CONFIG_KERNEL_BZIP2) := bz2 | |
147 | suffix-$(CONFIG_KERNEL_LZMA) := lzma | |
30314804 | 148 | suffix-$(CONFIG_KERNEL_XZ) := xz |
13510997 | 149 | suffix-$(CONFIG_KERNEL_LZO) := lzo |
f9b493ac | 150 | suffix-$(CONFIG_KERNEL_LZ4) := lz4 |
ae03c499 | 151 | |
02a884c0 | 152 | quiet_cmd_mkpiggy = MKPIGGY $@ |
4d2d5424 | 153 | cmd_mkpiggy = $(obj)/mkpiggy $< > $@ || ( rm -f $@ ; false ) |
02a884c0 PA |
154 | |
155 | targets += piggy.S | |
156 | $(obj)/piggy.S: $(obj)/vmlinux.bin.$(suffix-y) $(obj)/mkpiggy FORCE | |
157 | $(call if_changed,mkpiggy) |