projects/linux·blob master · refs

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1# SPDX-License-Identifier: GPL-2.0-only
2#
3# Create a self-extracting compressed vmlinux image from the original
4# vmlinux. aboot loads and enters it like a plain vmlinux.
5#
6
7OBJECTS := head.o misc.o trampoline.o piggy.o
8OBJECTS += memcpy.o memmove.o memset.o
9OBJECTS += __divqu.o __remqu.o __divlu.o __remlu.o
10targets := vmlinux.lds vmlinux vmlinux.bin
11targets += vmlinux.bin.bz2 vmlinux.bin.gz vmlinux.bin.lz4
12targets += vmlinux.bin.lzma vmlinux.bin.lzo vmlinux.bin.xz
13targets += vmlinux.bin.zst
14targets += $(OBJECTS)
15
16# The stub runs before the kernel has identified the CPU it booted on, so
17# build it for the base Alpha instruction set rather than inheriting the
18# kernel's -mcpu=.
19KBUILD_CFLAGS := -D__KERNEL__ -std=gnu11 -Os -fno-strict-aliasing
20KBUILD_CFLAGS += -fno-PIE -ffreestanding -fno-stack-protector
21KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
22KBUILD_CFLAGS += -pipe -mcpu=ev4 -mno-fp-regs -ffixed-8
23KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING -D__DISABLE_EXPORTS
24KBUILD_CFLAGS += $(CC_FLAGS_DIALECT)
25KBUILD_AFLAGS := -D__ASSEMBLY__ $(KBUILD_CFLAGS)
26
27# The stub has no sanitizer or coverage runtime. arch/alpha/lib/lib.a is
28# built with the kernel's instrumentation and -mcpu=, so build private
29# copies of the library routines the stub needs instead of linking it.
30UBSAN_SANITIZE := n
31GCOV_PROFILE := n
32
33$(obj)/memcpy.o: $(srctree)/arch/alpha/lib/memcpy.c FORCE
34 $(call if_changed_dep,cc_o_c)
35
36$(obj)/memmove.o: $(srctree)/arch/alpha/lib/memmove.S FORCE
37 $(call if_changed_dep,as_o_S)
38
39$(obj)/memset.o: $(srctree)/arch/alpha/lib/memset.S FORCE
40 $(call if_changed_dep,as_o_S)
41
42AFLAGS___divqu.o := -DDIV
43AFLAGS___remqu.o := -DREM
44AFLAGS___divlu.o := -DDIV -DINTSIZE
45AFLAGS___remlu.o := -DREM -DINTSIZE
46
47$(addprefix $(obj)/,__divqu.o __remqu.o __divlu.o __remlu.o): $(srctree)/arch/alpha/lib/divide.S FORCE
48 $(call if_changed_dep,as_o_S)
49
50# zstd's decompressor uses __builtin_ctzll()/__builtin_clzll(). Those are
51# inline code only with the CIX extension, which the base instruction set
52# the stub is built for does not have, so they become calls to libgcc's
53# __ctzdi2/__clzdi2.
54LIBGCC := $(shell $(CC) -print-libgcc-file-name)
55
56LDFLAGS_vmlinux := -X --orphan-handling=warn -T
57$(obj)/vmlinux: $(obj)/vmlinux.lds $(addprefix $(obj)/, $(OBJECTS)) $(LIBGCC) FORCE
58 $(call if_changed,ld)
59
60OBJCOPYFLAGS_vmlinux.bin := -R .comment -R .note -S
61$(obj)/vmlinux.bin: vmlinux FORCE
62 $(call if_changed,objcopy)
63
64suffix-$(CONFIG_KERNEL_BZIP2) := bz2
65suffix-$(CONFIG_KERNEL_GZIP) := gz
66suffix-$(CONFIG_KERNEL_LZ4) := lz4
67suffix-$(CONFIG_KERNEL_LZMA) := lzma
68suffix-$(CONFIG_KERNEL_LZO) := lzo
69suffix-$(CONFIG_KERNEL_XZ) := xz
70suffix-$(CONFIG_KERNEL_ZSTD) := zst
71
72$(obj)/vmlinux.bin.bz2: $(obj)/vmlinux.bin FORCE
73 $(call if_changed,bzip2_with_size)
74$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
75 $(call if_changed,gzip)
76$(obj)/vmlinux.bin.lz4: $(obj)/vmlinux.bin FORCE
77 $(call if_changed,lz4_with_size)
78$(obj)/vmlinux.bin.lzma: $(obj)/vmlinux.bin FORCE
79 $(call if_changed,lzma_with_size)
80$(obj)/vmlinux.bin.lzo: $(obj)/vmlinux.bin FORCE
81 $(call if_changed,lzo_with_size)
82$(obj)/vmlinux.bin.xz: $(obj)/vmlinux.bin FORCE
83 $(call if_changed,xzkern_with_size)
84$(obj)/vmlinux.bin.zst: $(obj)/vmlinux.bin FORCE
85 $(call if_changed,zstd22_with_size)
86
87LDFLAGS_piggy.o := -r --format binary --oformat elf64-alpha -T
88$(obj)/piggy.o: $(obj)/vmlinux.scr $(obj)/vmlinux.bin.$(suffix-y) FORCE
89 $(call if_changed,ld)