mirror of
https://github.com/torvalds/linux.git
synced 2025-10-31 00:28:52 +02:00
8630c59e99
- Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which exports a
symbol only to specified modules
- Improve ABI handling in gendwarfksyms
- Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n
- Add checkers for redundant or missing <linux/export.h> inclusion
- Deprecate the extra-y syntax
- Fix a genksyms bug when including enum constants from *.symref files
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Merge tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild updates from Masahiro Yamada:
- Add support for the EXPORT_SYMBOL_GPL_FOR_MODULES() macro, which
exports a symbol only to specified modules
- Improve ABI handling in gendwarfksyms
- Forcibly link lib-y objects to vmlinux even if CONFIG_MODULES=n
- Add checkers for redundant or missing <linux/export.h> inclusion
- Deprecate the extra-y syntax
- Fix a genksyms bug when including enum constants from *.symref files
* tag 'kbuild-v6.16' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (28 commits)
genksyms: Fix enum consts from a reference affecting new values
arch: use always-$(KBUILD_BUILTIN) for vmlinux.lds
kbuild: set y instead of 1 to KBUILD_{BUILTIN,MODULES}
efi/libstub: use 'targets' instead of extra-y in Makefile
module: make __mod_device_table__* symbols static
scripts/misc-check: check unnecessary #include <linux/export.h> when W=1
scripts/misc-check: check missing #include <linux/export.h> when W=1
scripts/misc-check: add double-quotes to satisfy shellcheck
kbuild: move W=1 check for scripts/misc-check to top-level Makefile
scripts/tags.sh: allow to use alternative ctags implementation
kconfig: introduce menu type enum
docs: symbol-namespaces: fix reST warning with literal block
kbuild: link lib-y objects to vmlinux forcibly even when CONFIG_MODULES=n
tinyconfig: enable CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
docs/core-api/symbol-namespaces: drop table of contents and section numbering
modpost: check forbidden MODULE_IMPORT_NS("module:") at compile time
kbuild: move kbuild syntax processing to scripts/Makefile.build
Makefile: remove dependency on archscripts for header installation
Documentation/kbuild: Add new gendwarfksyms kABI rules
Documentation/kbuild: Drop section numbers
...
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491 lines
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# SPDX-License-Identifier: GPL-2.0
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# Finds the multi-part object the current object will be linked into.
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# If the object belongs to two or more multi-part objects, list them all.
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modname-multi = $(sort $(foreach m,$(multi-obj-ym),\
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$(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))
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__modname = $(or $(modname-multi),$(basetarget))
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modname = $(subst $(space),:,$(__modname))
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modfile = $(addprefix $(obj)/,$(__modname))
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# target with $(obj)/ and its suffix stripped
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target-stem = $(basename $(patsubst $(obj)/%,%,$@))
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# These flags are needed for modversions and compiling, so we define them here
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# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
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# end up in (or would, if it gets compiled in)
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name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
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name-fix = $(call stringify,$(call name-fix-token,$1))
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basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
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modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
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-D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
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modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
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_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
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$(filter-out $(ccflags-remove-y), \
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$(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
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$(CFLAGS_$(target-stem).o))
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_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \
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$(filter-out $(rustflags-remove-y), \
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$(KBUILD_RUSTFLAGS) $(rustflags-y)) \
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$(RUSTFLAGS_$(target-stem).o))
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_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
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$(filter-out $(asflags-remove-y), \
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$(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
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$(AFLAGS_$(target-stem).o))
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_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
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#
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# Enable gcov profiling flags for a file, directory or for all files depending
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# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
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# (in this order)
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#
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ifeq ($(CONFIG_GCOV_KERNEL),y)
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_c_flags += $(if $(patsubst n%,, \
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$(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \
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$(CFLAGS_GCOV))
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endif
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#
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# Enable address sanitizer flags for kernel except some files or directories
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# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
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#
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ifeq ($(CONFIG_KASAN),y)
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ifneq ($(CONFIG_KASAN_HW_TAGS),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
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$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
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_rust_flags += $(if $(patsubst n%,, \
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$(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \
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$(RUSTFLAGS_KASAN))
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endif
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endif
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ifeq ($(CONFIG_KMSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \
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$(CFLAGS_KMSAN))
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_c_flags += $(if $(patsubst n%,, \
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$(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \
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, -mllvm -msan-disable-checks=1)
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endif
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ifeq ($(CONFIG_UBSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \
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$(CFLAGS_UBSAN))
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_c_flags += $(if $(patsubst n%,, \
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$(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \
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$(CFLAGS_UBSAN_INTEGER_WRAP))
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endif
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ifeq ($(CONFIG_KCOV),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \
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$(CFLAGS_KCOV))
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_rust_flags += $(if $(patsubst n%,, \
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$(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \
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$(RUSTFLAGS_KCOV))
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endif
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#
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# Enable KCSAN flags except some files or directories we don't want to check
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# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
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#
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ifeq ($(CONFIG_KCSAN),y)
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_c_flags += $(if $(patsubst n%,, \
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$(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \
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$(CFLAGS_KCSAN))
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# Some uninstrumented files provide implied barriers required to avoid false
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# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.
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_c_flags += $(if $(patsubst n%,, \
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$(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \
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-D__KCSAN_INSTRUMENT_BARRIERS__)
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endif
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#
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# Enable AutoFDO build flags except some files or directories we don't want to
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# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).
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#
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ifeq ($(CONFIG_AUTOFDO_CLANG),y)
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_c_flags += $(if $(patsubst n%,, \
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$(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \
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$(CFLAGS_AUTOFDO_CLANG))
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endif
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#
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# Enable Propeller build flags except some files or directories we don't want to
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# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE).
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#
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ifdef CONFIG_PROPELLER_CLANG
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_c_flags += $(if $(patsubst n%,, \
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$(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \
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$(CFLAGS_PROPELLER_CLANG))
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endif
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# $(src) for including checkin headers from generated source files
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# $(obj) for including generated headers from checkin source files
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ifdef building_out_of_srctree
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_c_flags += $(addprefix -I, $(src) $(obj))
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_a_flags += $(addprefix -I, $(src) $(obj))
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_cpp_flags += $(addprefix -I, $(src) $(obj))
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endif
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# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules
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is-kernel-object = $(or $(part-of-builtin),$(part-of-module))
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part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)
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part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
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quiet_modtag = $(if $(part-of-module),[M], )
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modkern_cflags = \
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$(if $(part-of-module), \
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$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
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$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
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modkern_rustflags = \
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$(if $(part-of-module), \
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$(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \
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$(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))
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modkern_aflags = $(if $(part-of-module), \
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$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
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$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags))
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c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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-include $(srctree)/include/linux/compiler_types.h \
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$(_c_flags) $(modkern_cflags) \
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$(basename_flags) $(modname_flags)
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rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg
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a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(_a_flags) $(modkern_aflags) $(modname_flags)
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cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
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$(_cpp_flags)
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ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
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ifdef CONFIG_OBJTOOL
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objtool := $(objtree)/tools/objtool/objtool
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objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label
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objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr
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objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake
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objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt
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objtool-args-$(CONFIG_FINEIBT) += --cfi
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objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount
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ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
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objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop
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endif
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objtool-args-$(CONFIG_UNWINDER_ORC) += --orc
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objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline
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objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk
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objtool-args-$(CONFIG_MITIGATION_SLS) += --sls
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objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval
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objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call
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objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess
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objtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachable
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objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)
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objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror
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objtool-args = $(objtool-args-y) \
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$(if $(delay-objtool), --link) \
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$(if $(part-of-module), --module)
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delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
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cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)
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cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
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objtool-enabled := y
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endif # CONFIG_OBJTOOL
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# Useful for describing the dependency of composite objects
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# Usage:
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# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
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define multi_depend
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$(foreach m, $1, \
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$(eval $m: \
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$(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))
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endef
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# Remove ".." and "." from a path, without using "realpath"
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# Usage:
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# $(call normalize_path,path/to/../file)
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define normalize_path
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$(strip $(eval elements :=) \
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$(foreach elem,$(subst /, ,$1), \
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$(if $(filter-out .,$(elem)), \
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$(if $(filter ..,$(elem)), \
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$(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \
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$(eval elements := $(elements) $(elem))))) \
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$(subst $(space),/,$(elements)))
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endef
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# Build commands
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# ===========================================================================
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# These are shared by some Makefile.* files.
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ifdef CONFIG_LTO_CLANG
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# Run $(LD) here to convert LLVM IR to ELF in the following cases:
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# - when this object needs objtool processing, as objtool cannot process LLVM IR
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# - when this is a single-object module, as modpost cannot process LLVM IR
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cmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
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endif
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quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
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$(cmd_ld_single) \
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$(cmd_objtool)
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define rule_cc_o_c
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$(call cmd_and_fixdep,cc_o_c)
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$(call cmd,checksrc)
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$(call cmd,checkdoc)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_c)
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$(call cmd,record_mcount)
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$(call cmd,warn_shared_object)
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endef
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_S)
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$(call cmd,warn_shared_object)
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endef
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# Copy a file
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# ===========================================================================
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# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,
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# the copy would be read-only as well, leading to an error when executing the
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# rule next time. Use 'cat' instead in order to generate a writable file.
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quiet_cmd_copy = COPY $@
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cmd_copy = cat $< > $@
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$(obj)/%: $(src)/%_shipped
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$(call cmd,copy)
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# Touch a file
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# ===========================================================================
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quiet_cmd_touch = TOUCH $(call normalize_path,$@)
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cmd_touch = touch $@
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# Commands useful for building a boot image
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# ===========================================================================
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#
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# Use as following:
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#
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# target: source(s) FORCE
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# $(if_changed,ld/objcopy/gzip)
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#
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# and add target to 'targets' so that we know we have to
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# read in the saved command line
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# Linking
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# ---------------------------------------------------------------------------
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quiet_cmd_ld = LD $@
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cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
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# Archive
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# ---------------------------------------------------------------------------
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quiet_cmd_ar = AR $@
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cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
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# Objcopy
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# ---------------------------------------------------------------------------
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quiet_cmd_objcopy = OBJCOPY $@
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cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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# Gzip
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# ---------------------------------------------------------------------------
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quiet_cmd_gzip = GZIP $@
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cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
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# Bzip2
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# ---------------------------------------------------------------------------
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# Bzip2 and LZMA do not include size in file... so we have to fake that;
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# append the size as a 32-bit littleendian number as gzip does.
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size_append = printf $(shell \
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dec_size=0; \
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for F in $(real-prereqs); do \
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fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
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dec_size=$$(expr $$dec_size + $$fsize); \
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done; \
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printf "%08x\n" $$dec_size | \
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sed 's/\(..\)/\1 /g' | { \
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read ch0 ch1 ch2 ch3; \
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for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
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printf '%s%03o' '\\' $$((0x$$ch)); \
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done; \
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} \
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)
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quiet_cmd_file_size = GEN $@
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cmd_file_size = $(size_append) > $@
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quiet_cmd_bzip2 = BZIP2 $@
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cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@
|
|
|
|
quiet_cmd_bzip2_with_size = BZIP2 $@
|
|
cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
|
|
|
|
# Lzma
|
|
# ---------------------------------------------------------------------------
|
|
|
|
quiet_cmd_lzma = LZMA $@
|
|
cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@
|
|
|
|
quiet_cmd_lzma_with_size = LZMA $@
|
|
cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
|
|
|
|
quiet_cmd_lzo = LZO $@
|
|
cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@
|
|
|
|
quiet_cmd_lzo_with_size = LZO $@
|
|
cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
|
|
|
|
quiet_cmd_lz4 = LZ4 $@
|
|
cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@
|
|
|
|
quiet_cmd_lz4_with_size = LZ4 $@
|
|
cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \
|
|
$(size_append); } > $@
|
|
|
|
# U-Boot mkimage
|
|
# ---------------------------------------------------------------------------
|
|
|
|
MKIMAGE := $(srctree)/scripts/mkuboot.sh
|
|
|
|
# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
|
|
# the number of overrides in arch makefiles
|
|
UIMAGE_ARCH ?= $(SRCARCH)
|
|
UIMAGE_COMPRESSION ?= $(or $(2),none)
|
|
UIMAGE_OPTS-y ?=
|
|
UIMAGE_TYPE ?= kernel
|
|
UIMAGE_LOADADDR ?= arch_must_set_this
|
|
UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
|
|
UIMAGE_NAME ?= Linux-$(KERNELRELEASE)
|
|
|
|
quiet_cmd_uimage = UIMAGE $@
|
|
cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
|
|
-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
|
|
-T $(UIMAGE_TYPE) \
|
|
-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
|
|
-n '$(UIMAGE_NAME)' -d $< $@
|
|
|
|
# Flat Image Tree (FIT)
|
|
# This allows for packaging of a kernel and all devicetrees files, using
|
|
# compression.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
MAKE_FIT := $(srctree)/scripts/make_fit.py
|
|
|
|
# Use this to override the compression algorithm
|
|
FIT_COMPRESSION ?= gzip
|
|
|
|
quiet_cmd_fit = FIT $@
|
|
cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \
|
|
--name '$(UIMAGE_NAME)' \
|
|
$(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \
|
|
$(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \
|
|
--compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)
|
|
|
|
# XZ
|
|
# ---------------------------------------------------------------------------
|
|
# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to
|
|
# compress other things.
|
|
#
|
|
# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
|
|
# of the kernel decompressor. A BCJ filter is used if it is available for
|
|
# the target architecture.
|
|
#
|
|
# xzkern_with_size also appends uncompressed size of the data using
|
|
# size_append. The .xz format has the size information available at the end
|
|
# of the file too, but it's in more complex format and it's good to avoid
|
|
# changing the part of the boot code that reads the uncompressed size.
|
|
# Note that the bytes added by size_append will make the xz tool think that
|
|
# the file is corrupt. This is expected.
|
|
#
|
|
# xzmisc doesn't use size_append, so it can be used to create normal .xz
|
|
# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
|
|
# big dictionary would increase the memory usage too much in the multi-call
|
|
# decompression mode. A BCJ filter isn't used either.
|
|
quiet_cmd_xzkern = XZKERN $@
|
|
cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@
|
|
|
|
quiet_cmd_xzkern_with_size = XZKERN $@
|
|
cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
|
|
$(size_append); } > $@
|
|
|
|
quiet_cmd_xzmisc = XZMISC $@
|
|
cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
|
|
|
|
# ZSTD
|
|
# ---------------------------------------------------------------------------
|
|
# Appends the uncompressed size of the data using size_append. The .zst
|
|
# format has the size information available at the beginning of the file too,
|
|
# but it's in a more complex format and it's good to avoid changing the part
|
|
# of the boot code that reads the uncompressed size.
|
|
#
|
|
# Note that the bytes added by size_append will make the zstd tool think that
|
|
# the file is corrupt. This is expected.
|
|
#
|
|
# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
|
|
# 128 MB. zstd22 is used for kernel compression because it is decompressed in a
|
|
# single pass, so zstd doesn't need to allocate a window buffer. When streaming
|
|
# decompression is used, like initramfs decompression, zstd22 should likely not
|
|
# be used because it would require zstd to allocate a 128 MB buffer.
|
|
|
|
quiet_cmd_zstd = ZSTD $@
|
|
cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@
|
|
|
|
quiet_cmd_zstd22 = ZSTD22 $@
|
|
cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@
|
|
|
|
quiet_cmd_zstd22_with_size = ZSTD22 $@
|
|
cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
|
|
|
|
# ASM offsets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# Default sed regexp - multiline due to syntax constraints
|
|
#
|
|
# Use [:space:] because LLVM's integrated assembler inserts <tab> around
|
|
# the .ascii directive whereas GCC keeps the <space> as-is.
|
|
define sed-offsets
|
|
's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
|
|
/^->/{s:->#\(.*\):/* \1 */:; \
|
|
s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
|
|
s:->::; p;}'
|
|
endef
|
|
|
|
# Use filechk to avoid rebuilds when a header changes, but the resulting file
|
|
# does not
|
|
define filechk_offsets
|
|
echo "#ifndef $2"; \
|
|
echo "#define $2"; \
|
|
echo "/*"; \
|
|
echo " * DO NOT MODIFY."; \
|
|
echo " *"; \
|
|
echo " * This file was generated by Kbuild"; \
|
|
echo " */"; \
|
|
echo ""; \
|
|
sed -ne $(sed-offsets) < $<; \
|
|
echo ""; \
|
|
echo "#endif"
|
|
endef
|