mirror of
https://github.com/torvalds/linux.git
synced 2026-04-18 06:44:00 -04:00
3a2486cc1d
A new experimental Kconfig option, `RUST_INLINE_HELPERS` is added to
allow C helpers (which were created to allow Rust to call into
inline/macro C functions without having to re-implement the logic in
Rust) to be inlined into Rust crates without performing global LTO.
If the option is enabled, the following is performed:
* For helpers, instead of compiling them to an object file to be linked
into vmlinux, they're compiled to LLVM IR bitcode. Two versions are
generated: one for built-in code (`helpers.bc`) and one for modules
(`helpers_module.bc`, with -DMODULE defined). This ensures that C
macros/inlines that behave differently for modules (e.g. static calls)
function correctly when inlined.
* When a Rust crate or object is compiled, instead of generating an
object file, LLVM bitcode is generated.
* llvm-link is invoked with --internalize to combine the helper bitcode
with the crate bitcode. This step is similar to LTO, but this is much
faster since it only needs to inline the helpers.
* clang is invoked to turn the combined bitcode into a final object file.
* Since clang may produce LLVM bitcode when LTO is enabled, and objtool
requires ELF input, $(cmd_ld_single) is invoked to ensure the object
is converted to ELF before objtool runs.
The --internalize flag tells llvm-link to treat all symbols in
helpers.bc using `internal` linkage [1]. This matches the behavior of
`clang` on `static inline` functions, and avoids exporting the symbol
from the object file.
To ensure that RUST_INLINE_HELPERS is not incompatible with BTF, we pass
the -g0 flag when building helpers. See commit 5daa0c35a1 ("rust:
Disallow BTF generation with Rust + LTO") for details.
We have an intended triple mismatch of `aarch64-unknown-none` vs
`aarch64-unknown-linux-gnu`, so we pass --suppress-warnings to llvm-link
to suppress it.
I considered adding some sort of check that KBUILD_MODNAME is not
present in helpers_module.bc, but this is actually not so easy to carry
out because .bc files store strings in a weird binary format, so you
cannot just grep it for a string to check whether it ended up using
KBUILD_MODNAME anywhere.
[ Andreas writes:
For the rnull driver, enabling helper inlining with this patch
gives an average speedup of 2% over the set of 120 workloads that
we publish on [2].
Link: https://rust-for-linux.com/null-block-driver [2]
This series also uncovered a pre-existing UB instance thanks to an
`objtool` warning which I noticed while testing the series (details
in the mailing list).
- Miguel ]
Link: https://github.com/llvm/llvm-project/pull/170397 [1]
Co-developed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Co-developed-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Gary Guo <gary@garyguo.net>
Co-developed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Link: https://patch.msgid.link/20260203-inline-helpers-v2-3-beb8547a03c9@google.com
[ Some changes, apart from the rebase:
- Added "(EXPERIMENTAL)" to Kconfig as the commit mentions.
- Added `depends on ARM64 || X86_64` and `!UML` for now, since this is
experimental, other architectures may require other changes (e.g.
the issues I mentioned in the mailing list for ARM and UML) and they
are not really tested so far. So let arch maintainers pick this up
if they think it is worth it.
- Gated the `cmd_ld_single` step also into the new mode, which also
means that any possible future `objcopy` step is done after the
translation, as expected.
- Added `.gitignore` for `.bc` with exception for existing script.
- Added `part-of-*` for helpers bitcode files as discussed, and
dropped `$(if $(filter %_module.bc,$@),-DMODULE)` since `-DMODULE`
is already there (would be duplicated otherwise).
- Moved `LLVM_LINK` to keep binutils list alphabetized.
- Fixed typo in title.
- Dropped second `cmd_ld_single` commit message paragraph.
- Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
600 lines
21 KiB
Makefile
600 lines
21 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Building
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# ==========================================================================
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src := $(srcroot)/$(obj)
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PHONY := $(obj)/
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$(obj)/:
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# Init all relevant variables used in kbuild files so
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# 1) they have correct type
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# 2) they do not inherit any value from the environment
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obj-y :=
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obj-m :=
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lib-y :=
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lib-m :=
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always-y :=
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always-m :=
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targets :=
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subdir-y :=
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subdir-m :=
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asflags-y :=
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ccflags-y :=
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rustflags-y :=
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cppflags-y :=
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ldflags-y :=
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subdir-asflags-y :=
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subdir-ccflags-y :=
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# Read auto.conf if it exists, otherwise ignore
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-include $(objtree)/include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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include $(srctree)/scripts/Makefile.compiler
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include $(kbuild-file)
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include $(srctree)/scripts/Makefile.lib
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# flags that take effect in current and sub directories
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KBUILD_AFLAGS += $(subdir-asflags-y)
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KBUILD_CFLAGS += $(subdir-ccflags-y)
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KBUILD_RUSTFLAGS += $(subdir-rustflags-y)
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# Figure out what we need to build from the various variables
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# ===========================================================================
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# When an object is listed to be built compiled-in and modular,
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# only build the compiled-in version
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obj-m := $(filter-out $(obj-y),$(obj-m))
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# Libraries are always collected in one lib file.
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# Filter out objects already built-in
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lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
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# Subdirectories we need to descend into
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subdir-ym := $(sort $(subdir-y) $(subdir-m) \
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$(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
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# Handle objects in subdirs:
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# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
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# foo/modules.order
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# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
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#
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# Generate modules.order to determine modorder. Unfortunately, we don't have
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# information about ordering between -y and -m subdirs. Just put -y's first.
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ifdef need-modorder
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obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
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else
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obj-m := $(filter-out %/, $(obj-m))
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endif
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ifdef need-builtin
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obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
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else
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obj-y := $(filter-out %/, $(obj-y))
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endif
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# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals
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suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s))))
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# List composite targets that are constructed by combining other targets
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multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m)))
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# List primitive targets that are compiled from source files
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real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m))
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# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
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multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y)
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multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m)
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multi-obj-ym := $(multi-obj-y) $(multi-obj-m)
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# Replace multi-part objects by their individual parts,
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# including built-in.a from subdirectories
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real-obj-y := $(call real-search, $(obj-y), .o, -objs -y)
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real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m)
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always-y += $(always-m)
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# hostprogs-always-y += foo
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# ... is a shorthand for
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# hostprogs += foo
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# always-y += foo
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hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
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always-y += $(hostprogs-always-y) $(hostprogs-always-m)
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# userprogs-always-y is likewise.
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userprogs += $(userprogs-always-y) $(userprogs-always-m)
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always-y += $(userprogs-always-y) $(userprogs-always-m)
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# Add subdir path
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ifneq ($(obj),.)
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extra-y := $(addprefix $(obj)/, $(extra-y))
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always-y := $(addprefix $(obj)/, $(always-y))
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targets := $(addprefix $(obj)/, $(targets))
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obj-m := $(addprefix $(obj)/, $(obj-m))
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lib-y := $(addprefix $(obj)/, $(lib-y))
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real-obj-y := $(addprefix $(obj)/, $(real-obj-y))
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real-obj-m := $(addprefix $(obj)/, $(real-obj-m))
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multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m))
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subdir-ym := $(addprefix $(obj)/, $(subdir-ym))
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endif
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ifndef obj
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$(warning kbuild: Makefile.build is included improperly)
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endif
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ifeq ($(need-modorder),)
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ifneq ($(obj-m),)
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$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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endif
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endif
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# ===========================================================================
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# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
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subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
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subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
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targets-for-builtin := $(extra-y)
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ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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targets-for-builtin += $(obj)/lib.a
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endif
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ifdef need-builtin
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targets-for-builtin += $(obj)/built-in.a
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endif
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targets-for-modules := $(foreach x, o mod, \
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$(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
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ifdef need-modorder
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targets-for-modules += $(obj)/modules.order
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endif
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targets += $(targets-for-builtin) $(targets-for-modules)
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# Linus' kernel sanity checking tool
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ifeq ($(KBUILD_CHECKSRC),1)
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quiet_cmd_checksrc = CHECK $<
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cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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else ifeq ($(KBUILD_CHECKSRC),2)
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quiet_cmd_force_checksrc = CHECK $<
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cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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endif
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ifeq ($(KBUILD_EXTMOD),)
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ifneq ($(KBUILD_EXTRA_WARN),)
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cmd_checkdoc = PYTHONDONTWRITEBYTECODE=1 $(PYTHON3) $(KERNELDOC) -none $(KDOCFLAGS) \
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$(if $(findstring 2, $(KBUILD_EXTRA_WARN)), -Wall) \
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$<
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endif
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endif
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# Compile C sources (.c)
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# ---------------------------------------------------------------------------
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
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$(obj)/%.s: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(obj)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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getexportsymbols = $(NM) $@ | sed -n 's/.* __export_symbol_\(.*\)/$(1)/p'
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gendwarfksyms = $(objtree)/scripts/gendwarfksyms/gendwarfksyms \
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$(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes)) \
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$(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable)
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genksyms = $(objtree)/scripts/genksyms/genksyms \
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$(if $(KBUILD_SYMTYPES), -T $(@:.o=.symtypes)) \
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$(if $(KBUILD_PRESERVE), -p) \
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$(addprefix -r , $(wildcard $(@:.o=.symref)))
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# These mirror gensymtypes_S and co below, keep them in synch.
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ifdef CONFIG_GENDWARFKSYMS
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cmd_gensymtypes_c = $(if $(skip_gendwarfksyms),, \
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$(call getexportsymbols,\1) | $(gendwarfksyms) $@)
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else
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cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
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endif # CONFIG_GENDWARFKSYMS
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
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$(obj)/%.ll: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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# The C file is compiled and updated dependency information is generated.
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# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
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ifdef CONFIG_MODVERSIONS
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# When module versioning is enabled the following steps are executed:
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# o compile a <file>.o from <file>.c
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# o if <file>.o doesn't contain a __export_symbol_*, i.e. does
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# not export symbols, it's done.
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# o otherwise, we calculate symbol versions using the good old
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# genksyms on the preprocessed source and dump them into the .cmd file.
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# o modpost will extract versions from that file and create *.c files that will
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# be compiled and linked to the kernel and/or modules.
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gen_symversions = \
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if $(NM) $@ 2>/dev/null | grep -q ' __export_symbol_'; then \
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$(cmd_gensymtypes_$1) >> $(dot-target).cmd; \
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fi
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cmd_gen_symversions_c = $(call gen_symversions,c)
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endif
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ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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recordmcount_source := $(srctree)/scripts/recordmcount.c \
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$(srctree)/scripts/recordmcount.h
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else
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sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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"$(if $(CONFIG_64BIT),64,32)" \
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"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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"$(if $(part-of-module),1,0)" "$(@)";
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recordmcount_source := $(srctree)/scripts/recordmcount.pl
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endif # BUILD_C_RECORDMCOUNT
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cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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$(sub_cmd_record_mcount))
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endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(target-stem).o)$(OBJECT_FILES_NON_STANDARD)n),$(is-kernel-object))
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ifdef CONFIG_OBJTOOL
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$(obj)/%.o: private objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
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endif
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ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
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cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
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endif
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# Built-in and composite module parts
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$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE
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$(call if_changed_rule,cc_o_c)
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$(call cmd,force_checksrc)
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# To make this rule robust against "Argument list too long" error,
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# ensure to add $(obj)/ prefix by a shell command.
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cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
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$(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
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$(obj)/%.mod: FORCE
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$(call if_changed,mod)
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quiet_cmd_cc_lst_c = MKLST $@
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cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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$(obj)/%.lst: $(obj)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# Compile Rust sources (.rs)
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# ---------------------------------------------------------------------------
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# The features in this list are the ones allowed for non-`rust/` code.
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#
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# - Stable since Rust 1.79.0: `feature(inline_const)`.
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# - Stable since Rust 1.81.0: `feature(lint_reasons)`.
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# - Stable since Rust 1.82.0: `feature(asm_const)`,
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# `feature(offset_of_nested)`, `feature(raw_ref_op)`.
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# - Stable since Rust 1.87.0: `feature(asm_goto)`.
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# - Expected to become stable: `feature(arbitrary_self_types)`.
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# - To be determined: `feature(used_with_arg)`.
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#
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# Please see https://github.com/Rust-for-Linux/linux/issues/2 for details on
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# the unstable features in use.
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rust_allowed_features := asm_const,asm_goto,arbitrary_self_types,inline_const,lint_reasons,offset_of_nested,raw_ref_op,used_with_arg
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# `--out-dir` is required to avoid temporaries being created by `rustc` in the
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# current working directory, which may be not accessible in the out-of-tree
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# modules case.
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rust_common_cmd = \
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OBJTREE=$(abspath $(objtree)) \
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RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
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-Zallow-features=$(rust_allowed_features) \
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-Zcrate-attr=no_std \
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-Zcrate-attr='feature($(rust_allowed_features))' \
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-Zunstable-options --extern pin_init --extern kernel \
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--crate-type rlib -L $(objtree)/rust/ \
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--crate-name $(basename $(notdir $@)) \
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--sysroot=/dev/null \
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--out-dir $(dir $@) --emit=dep-info=$(depfile)
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# `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
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# will be used. We explicitly request `-Ccodegen-units=1` in any case, and
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# the compiler shows a warning if it is not 1. However, if we ever stop
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# requesting it explicitly and we start using some other `--emit` that does not
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# imply it (and for which codegen is performed), then we would be out of sync,
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# i.e. the outputs we would get for the different single targets (e.g. `.ll`)
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# would not match each other.
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quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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cmd_rustc_o_rs = $(rust_common_cmd) --emit=$(if $(CONFIG_RUST_INLINE_HELPERS),llvm-bc=$(patsubst %.o,%.bc,$@),obj=$@) $< \
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$(if $(CONFIG_RUST_INLINE_HELPERS),;$(LLVM_LINK) --internalize --suppress-warnings $(patsubst %.o,%.bc,$@) \
|
|
$(objtree)/rust/helpers/helpers$(if $(part-of-module),_module).bc -o $(patsubst %.o,%.m.bc,$@); \
|
|
$(CC) $(CLANG_FLAGS) $(KBUILD_CFLAGS) -Wno-override-module -c $(patsubst %.o,%.m.bc,$@) -o $@ \
|
|
$(cmd_ld_single)) \
|
|
$(cmd_objtool)
|
|
|
|
define rule_rustc_o_rs
|
|
$(call cmd_and_fixdep,rustc_o_rs)
|
|
$(call cmd,gen_objtooldep)
|
|
endef
|
|
|
|
$(obj)/%.o: $(obj)/%.rs FORCE
|
|
+$(call if_changed_rule,rustc_o_rs)
|
|
|
|
quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_rsi_rs = \
|
|
$(rust_common_cmd) -Zunpretty=expanded $< >$@; \
|
|
command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) --config-path $(srctree)/.rustfmt.toml $@
|
|
|
|
$(obj)/%.rsi: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_rsi_rs)
|
|
|
|
quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
|
|
|
|
$(obj)/%.s: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_s_rs)
|
|
|
|
quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
|
|
cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
|
|
|
|
$(obj)/%.ll: $(obj)/%.rs FORCE
|
|
+$(call if_changed_dep,rustc_ll_rs)
|
|
|
|
quiet_cmd_rustc_rs_rs_S = RSCPP $(quiet_modtag) $@
|
|
cmd_rustc_rs_rs_S = $(CPP) $(c_flags) -xc -C -P $< | sed '1,/^\/\/ Cut here.$$/d' >$@
|
|
|
|
$(obj)/%.rs: $(obj)/%.rs.S FORCE
|
|
+$(call if_changed_dep,rustc_rs_rs_S)
|
|
|
|
# Compile assembler sources (.S)
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
|
|
# or a file that it includes, in order to get versioned symbols. We build a
|
|
# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
|
|
# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
|
|
#
|
|
# This is convoluted. The .S file must first be preprocessed to run guards and
|
|
# expand names, then the resulting exports must be constructed into plain
|
|
# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
|
|
# to make the genksyms input or compiled into an object for gendwarfksyms.
|
|
#
|
|
# These mirror gensymtypes_c and co above, keep them in synch.
|
|
getasmexports = \
|
|
{ echo "\#include <linux/kernel.h>" ; \
|
|
echo "\#include <linux/string.h>" ; \
|
|
echo "\#include <asm/asm-prototypes.h>" ; \
|
|
$(call getexportsymbols,EXPORT_SYMBOL(\1);) ; }
|
|
|
|
ifdef CONFIG_GENDWARFKSYMS
|
|
cmd_gensymtypes_S = \
|
|
$(getasmexports) | \
|
|
$(CC) $(c_flags) -c -o $(@:.o=.gendwarfksyms.o) -xc -; \
|
|
$(call getexportsymbols,\1) | \
|
|
$(gendwarfksyms) $(@:.o=.gendwarfksyms.o)
|
|
else
|
|
cmd_gensymtypes_S = \
|
|
$(getasmexports) | \
|
|
$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
|
|
endif # CONFIG_GENDWARFKSYMS
|
|
|
|
quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
|
|
cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
|
|
|
|
$(obj)/%.s: $(obj)/%.S FORCE
|
|
$(call if_changed_dep,cpp_s_S)
|
|
|
|
ifdef CONFIG_ASM_MODVERSIONS
|
|
|
|
# versioning matches the C process described above, with difference that
|
|
# we parse asm-prototypes.h C header to get function definitions.
|
|
|
|
cmd_gen_symversions_S = $(call gen_symversions,S)
|
|
|
|
endif
|
|
|
|
$(obj)/%.o: $(obj)/%.S FORCE
|
|
$(call if_changed_rule,as_o_S)
|
|
|
|
targets += $(filter-out $(subdir-builtin), $(real-obj-y))
|
|
targets += $(filter-out $(subdir-modorder), $(real-obj-m))
|
|
targets += $(lib-y) $(always-y)
|
|
|
|
# Linker scripts preprocessor (.lds.S -> .lds)
|
|
# ---------------------------------------------------------------------------
|
|
quiet_cmd_cpp_lds_S = LDS $@
|
|
cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
|
|
-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
|
|
|
|
$(obj)/%.lds: $(src)/%.lds.S FORCE
|
|
$(call if_changed_dep,cpp_lds_S)
|
|
|
|
# ASN.1 grammar
|
|
# ---------------------------------------------------------------------------
|
|
quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
|
|
cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
|
|
$(basename $@).c $(basename $@).h
|
|
|
|
$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
|
|
$(call cmd,asn1_compiler)
|
|
|
|
# Build the compiled-in targets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# To build objects in subdirs, we need to descend into the directories
|
|
$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
|
|
$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file (without symbol table)
|
|
#
|
|
# To make this rule robust against "Argument list too long" error,
|
|
# remove $(obj)/ prefix, and restore it by a shell command.
|
|
|
|
quiet_cmd_ar_builtin = AR $@
|
|
cmd_ar_builtin = rm -f $@; \
|
|
$(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \
|
|
$(AR) cDPrST $@
|
|
|
|
$(obj)/built-in.a: $(real-obj-y) FORCE
|
|
$(call if_changed,ar_builtin)
|
|
|
|
# This is a list of build artifacts from the current Makefile and its
|
|
# sub-directories. The timestamp should be updated when any of the member files.
|
|
|
|
cmd_gen_order = { $(foreach m, $(real-prereqs), \
|
|
$(if $(filter %/$(notdir $@), $m), cat $m, echo $m);) :; } \
|
|
> $@
|
|
|
|
$(obj)/modules.order: $(obj-m) FORCE
|
|
$(call if_changed,gen_order)
|
|
|
|
#
|
|
# Rule to compile a set of .o files into one .a file (with symbol table)
|
|
#
|
|
|
|
$(obj)/lib.a: $(lib-y) FORCE
|
|
$(call if_changed,ar)
|
|
|
|
quiet_cmd_ld_multi_m = LD [M] $@
|
|
cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$< $(cmd_objtool)
|
|
|
|
define rule_ld_multi_m
|
|
$(call cmd_and_savecmd,ld_multi_m)
|
|
$(call cmd,gen_objtooldep)
|
|
endef
|
|
|
|
$(multi-obj-m): private objtool-enabled := $(delay-objtool)
|
|
$(multi-obj-m): private part-of-module := y
|
|
$(multi-obj-m): %.o: %.mod FORCE
|
|
$(call if_changed_rule,ld_multi_m)
|
|
$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
|
|
|
|
# Add intermediate targets:
|
|
# When building objects with specific suffix patterns, add intermediate
|
|
# targets that the final targets are derived from.
|
|
intermediate_targets = $(foreach sfx, $(2), \
|
|
$(patsubst %$(strip $(1)),%$(sfx), \
|
|
$(filter %$(strip $(1)), $(targets))))
|
|
# %.asn1.o <- %.asn1.[ch] <- %.asn1
|
|
targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h)
|
|
|
|
# Include additional build rules when necessary
|
|
# ---------------------------------------------------------------------------
|
|
|
|
# $(sort ...) is used here to remove duplicated words and excessive spaces.
|
|
hostprogs := $(sort $(hostprogs))
|
|
ifneq ($(hostprogs),)
|
|
include $(srctree)/scripts/Makefile.host
|
|
endif
|
|
|
|
# $(sort ...) is used here to remove duplicated words and excessive spaces.
|
|
userprogs := $(sort $(userprogs))
|
|
ifneq ($(userprogs),)
|
|
include $(srctree)/scripts/Makefile.userprogs
|
|
endif
|
|
|
|
# Single targets
|
|
# ---------------------------------------------------------------------------
|
|
|
|
single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))
|
|
single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
|
|
|
|
$(single-subdir-goals): $(single-subdirs)
|
|
@:
|
|
|
|
# Descending
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += $(subdir-ym)
|
|
$(subdir-ym):
|
|
$(Q)$(MAKE) $(build)=$@ \
|
|
need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
|
|
need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \
|
|
$(filter $@/%, $(single-subdir-goals))
|
|
|
|
# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += FORCE
|
|
|
|
FORCE:
|
|
|
|
targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))
|
|
targets := $(filter-out $(PHONY), $(targets))
|
|
|
|
# Now that targets is fully known, include dtb rules if needed
|
|
ifneq ($(need-dtbslist)$(dtb-y)$(dtb-)$(filter %.dtb %.dtb.o %.dtbo.o,$(targets)),)
|
|
include $(srctree)/scripts/Makefile.dtbs
|
|
endif
|
|
|
|
# Build
|
|
# Needs to be after the include of Makefile.dtbs, which updates always-y
|
|
# ---------------------------------------------------------------------------
|
|
|
|
$(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
|
|
$(if $(KBUILD_MODULES), $(targets-for-modules)) \
|
|
$(subdir-ym) $(always-y)
|
|
@:
|
|
|
|
# Read all saved command lines and dependencies for the $(targets) we
|
|
# may be building above, using $(if_changed{,_dep}). As an
|
|
# optimization, we don't need to read them if the target does not
|
|
# exist, we will rebuild anyway in that case.
|
|
|
|
existing-targets := $(wildcard $(sort $(targets)))
|
|
|
|
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
|
|
|
|
# Create directories for object files if they do not exist
|
|
obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
|
|
# If targets exist, their directories apparently exist. Skip mkdir.
|
|
existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
|
|
obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
|
|
ifneq ($(obj-dirs),)
|
|
$(shell mkdir -p $(obj-dirs))
|
|
endif
|
|
|
|
.PHONY: $(PHONY)
|