arch/x86/boot/compressed/Makefile

Source file repositories/reference/linux-study-clean/arch/x86/boot/compressed/Makefile

File Facts

System
Linux kernel
Corpus path
arch/x86/boot/compressed/Makefile
Extension
[no extension]
Size
6015 bytes
Lines
163
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: build/configuration rule
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

# SPDX-License-Identifier: GPL-2.0
#
# linux/arch/x86/boot/compressed/Makefile
#
# create a compressed vmlinux image from the original vmlinux
#
# vmlinuz is:
#	decompression code (*.o)
#	asm globals (piggy.S), including:
#		vmlinux.bin.(gz|bz2|lzma|...)
#
# vmlinux.bin is:
#	vmlinux stripped of debugging and comments
# vmlinux.bin.all is:
#	vmlinux.bin + vmlinux.relocs
# vmlinux.bin.(gz|bz2|lzma|...) is:
#	(see scripts/Makefile.lib size_append)
#	compressed vmlinux.bin.all + u32 size of vmlinux.bin.all

targets := vmlinux vmlinux.bin vmlinux.bin.gz vmlinux.bin.bz2 vmlinux.bin.lzma \
	vmlinux.bin.xz vmlinux.bin.lzo vmlinux.bin.lz4 vmlinux.bin.zst

# CLANG_FLAGS must come before any cc-disable-warning or cc-option calls in
# case of cross compiling, as it has the '--target=' flag, which is needed to
# avoid errors with '-march=i386', and future flags may depend on the target to
# be valid.
KBUILD_CFLAGS := -m$(BITS) -O2 $(CLANG_FLAGS)
KBUILD_CFLAGS += $(CC_FLAGS_DIALECT)
KBUILD_CFLAGS += -fno-strict-aliasing -fPIE
KBUILD_CFLAGS += -Wundef
KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
cflags-$(CONFIG_X86_32) := -march=i386
cflags-$(CONFIG_X86_64) := -mcmodel=small -mno-red-zone
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CFLAGS += -mno-mmx -mno-sse
KBUILD_CFLAGS += -ffreestanding -fshort-wchar
KBUILD_CFLAGS += -fno-stack-protector
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
KBUILD_CFLAGS += -Wno-pointer-sign
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += -D__DISABLE_EXPORTS
# Disable relocation relaxation in case the link is not PIE.
KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
KBUILD_CFLAGS += -include $(srctree)/include/linux/hidden.h

# sev-decode-insn.c indirectly includes inat-table.c which is generated during
# compilation and stored in $(objtree). Add the directory to the includes so
# that the compiler finds it even with out-of-tree builds (make O=/some/path).
CFLAGS_sev-handle-vc.o += -I$(objtree)/arch/x86/lib/

KBUILD_AFLAGS  := $(KBUILD_CFLAGS) -D__ASSEMBLY__

KBUILD_LDFLAGS := -m elf_$(UTS_MACHINE)
KBUILD_LDFLAGS += $(call ld-option,--no-ld-generated-unwind-info)
# Compressed kernel should be built as PIE since it may be loaded at any
# address by the bootloader.
LDFLAGS_vmlinux := -pie $(call ld-option, --no-dynamic-linker)
ifdef CONFIG_LD_ORPHAN_WARN
LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
endif
LDFLAGS_vmlinux += -z noexecstack
ifeq ($(CONFIG_LD_IS_BFD),y)
LDFLAGS_vmlinux += $(call ld-option,--no-warn-rwx-segments)
endif
ifeq ($(CONFIG_EFI_STUB),y)
# ensure that the static EFI stub library will be pulled in, even if it is
# never referenced explicitly from the startup code
LDFLAGS_vmlinux += -u efi_pe_entry
endif
LDFLAGS_vmlinux += -T

Annotation

Implementation Notes