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kbuild: preprocess module linker script

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There was a request to preprocess the module linker script like we
do for the vmlinux one. (https://lkml.org/lkml/2020/8/21/512)

The difference between vmlinux.lds and module.lds is that the latter
is needed for external module builds, thus must be cleaned up by
'make mrproper' instead of 'make clean'. Also, it must be created
by 'make modules_prepare'.

You cannot put it in arch/$(SRCARCH)/kernel/, which is cleaned up by
'make clean'. I moved arch/$(SRCARCH)/kernel/module.lds to
arch/$(SRCARCH)/include/asm/module.lds.h, which is included from
scripts/module.lds.S.

scripts/module.lds is fine because 'make clean' keeps all the
build artifacts under scripts/.

You can add arch-specific sections in <asm/module.lds.h>.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Tested-by: Jessica Yu <jeyu@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Masahiro Yamada 2020-09-08 13:27:08 +09:00
parent 887af6d7c9
commit 596b0474d3
21 changed files with 34 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Makefile
View File

@ -505,7 +505,6 @@ KBUILD_CFLAGS_KERNEL :=
KBUILD_AFLAGS_MODULE := -DMODULE
KBUILD_CFLAGS_MODULE := -DMODULE
KBUILD_LDFLAGS_MODULE :=
export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
KBUILD_LDFLAGS :=
CLANG_FLAGS :=
@ -1395,7 +1394,7 @@ endif
# using awk while concatenating to the final file.
PHONY += modules
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check
modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
PHONY += modules_check
@ -1412,6 +1411,7 @@ targets += modules.order
# Target to prepare building external modules
PHONY += modules_prepare
modules_prepare: prepare
$(Q)$(MAKE) $(build)=scripts scripts/module.lds
# Target to install modules
PHONY += modules_install
@ -1743,7 +1743,9 @@ help:
@echo ' clean - remove generated files in module directory only'
@echo ''
PHONY += prepare
# no-op for external module builds
PHONY += prepare modules_prepare
endif # KBUILD_EXTMOD
# Single targets
@ -1776,7 +1778,7 @@ MODORDER := .modules.tmp
endif
PHONY += single_modpost
single_modpost: $(single-no-ko)
single_modpost: $(single-no-ko) modules_prepare
$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

4
arch/arm/Makefile
View File

@ -16,10 +16,6 @@ LDFLAGS_vmlinux += --be8
KBUILD_LDFLAGS_MODULE += --be8
endif
ifeq ($(CONFIG_ARM_MODULE_PLTS),y)
KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds
endif
GZFLAGS :=-9
#KBUILD_CFLAGS +=-pipe

2
arch/arm/kernel/module.lds → arch/arm/include/asm/module.lds.h
View File

@ -1,5 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifdef CONFIG_ARM_MODULE_PLTS
SECTIONS {
.plt : { BYTE(0) }
.init.plt : { BYTE(0) }
}
#endif

4
arch/arm64/Makefile
View File

@ -115,10 +115,6 @@ endif
CHECKFLAGS += -D__aarch64__
ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
KBUILD_LDS_MODULE += $(srctree)/arch/arm64/kernel/module.lds
endif
ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y)
KBUILD_CPPFLAGS += -DCC_USING_PATCHABLE_FUNCTION_ENTRY
CC_FLAGS_FTRACE := -fpatchable-function-entry=2

2
arch/arm64/kernel/module.lds → arch/arm64/include/asm/module.lds.h
View File

@ -1,5 +1,7 @@
#ifdef CONFIG_ARM64_MODULE_PLTS
SECTIONS {
.plt (NOLOAD) : { BYTE(0) }
.init.plt (NOLOAD) : { BYTE(0) }
.text.ftrace_trampoline (NOLOAD) : { BYTE(0) }
}
#endif

1
arch/ia64/Makefile
View File

@ -20,7 +20,6 @@ CHECKFLAGS += -D__ia64=1 -D__ia64__=1 -D_LP64 -D__LP64__
OBJCOPYFLAGS := --strip-all
LDFLAGS_vmlinux := -static
KBUILD_LDS_MODULE += $(srctree)/arch/ia64/module.lds
KBUILD_AFLAGS_KERNEL := -mconstant-gp
EXTRA :=

0
arch/ia64/module.lds → arch/ia64/include/asm/module.lds.h
View File

1
arch/m68k/Makefile
View File

@ -75,7 +75,6 @@ KBUILD_CPPFLAGS += -D__uClinux__
endif
KBUILD_LDFLAGS := -m m68kelf
KBUILD_LDS_MODULE += $(srctree)/arch/m68k/kernel/module.lds
ifdef CONFIG_SUN3
LDFLAGS_vmlinux = -N

0
arch/m68k/kernel/module.lds → arch/m68k/include/asm/module.lds.h
View File

1
arch/powerpc/Makefile
View File

@ -65,7 +65,6 @@ UTS_MACHINE := $(subst $(space),,$(machine-y))
ifdef CONFIG_PPC32
KBUILD_LDFLAGS_MODULE += arch/powerpc/lib/crtsavres.o
else
KBUILD_LDS_MODULE += $(srctree)/arch/powerpc/kernel/module.lds
ifeq ($(call ld-ifversion, -ge, 225000000, y),y)
# Have the linker provide sfpr if possible.
# There is a corresponding test in arch/powerpc/lib/Makefile

0
arch/powerpc/kernel/module.lds → arch/powerpc/include/asm/module.lds.h
View File

3
arch/riscv/Makefile
View File

@ -53,9 +53,6 @@ endif
ifeq ($(CONFIG_CMODEL_MEDANY),y)
KBUILD_CFLAGS += -mcmodel=medany
endif
ifeq ($(CONFIG_MODULE_SECTIONS),y)
KBUILD_LDS_MODULE += $(srctree)/arch/riscv/kernel/module.lds
endif
ifeq ($(CONFIG_PERF_EVENTS),y)
KBUILD_CFLAGS += -fno-omit-frame-pointer
endif

3
arch/riscv/kernel/module.lds → arch/riscv/include/asm/module.lds.h
View File

@ -1,8 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2017 Andes Technology Corporation */
#ifdef CONFIG_MODULE_SECTIONS
SECTIONS {
.plt (NOLOAD) : { BYTE(0) }
.got (NOLOAD) : { BYTE(0) }
.got.plt (NOLOAD) : { BYTE(0) }
}
#endif

1
arch/um/include/asm/Kbuild
View File

@ -16,6 +16,7 @@ generic-y += kdebug.h
generic-y += mcs_spinlock.h
generic-y += mm-arch-hooks.h
generic-y += mmiowb.h
generic-y += module.lds.h
generic-y += param.h
generic-y += pci.h
generic-y += percpu.h

1
include/asm-generic/Kbuild
View File

@ -40,6 +40,7 @@ mandatory-y += mmiowb.h
mandatory-y += mmu.h
mandatory-y += mmu_context.h
mandatory-y += module.h
mandatory-y += module.lds.h
mandatory-y += msi.h
mandatory-y += pci.h
mandatory-y += percpu.h

10
include/asm-generic/module.lds.h Normal file
View File

@ -0,0 +1,10 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_GENERIC_MODULE_LDS_H
#define __ASM_GENERIC_MODULE_LDS_H
/*
* <asm/module.lds.h> can specify arch-specific sections for linking modules.
* Empty for the asm-generic header.
*/
#endif /* __ASM_GENERIC_MODULE_LDS_H */

1
scripts/.gitignore vendored
View File

@ -8,3 +8,4 @@ asn1_compiler
extract-cert
sign-file
insert-sys-cert
/module.lds

3
scripts/Makefile
View File

@ -29,6 +29,9 @@ endif
# The following programs are only built on demand
hostprogs += unifdef
# The module linker script is preprocessed on demand
targets += module.lds
subdir-$(CONFIG_GCC_PLUGINS) += gcc-plugins
subdir-$(CONFIG_MODVERSIONS) += genksyms
subdir-$(CONFIG_SECURITY_SELINUX) += selinux

5
scripts/Makefile.modfinal
View File

@ -33,11 +33,10 @@ quiet_cmd_ld_ko_o = LD [M] $@
cmd_ld_ko_o = \
$(LD) -r $(KBUILD_LDFLAGS) \
$(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \
$(addprefix -T , $(KBUILD_LDS_MODULE)) \
-o $@ $(filter %.o, $^); \
-T scripts/module.lds -o $@ $(filter %.o, $^); \
$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
$(modules): %.ko: %.o %.mod.o $(KBUILD_LDS_MODULE) FORCE
$(modules): %.ko: %.o %.mod.o scripts/module.lds FORCE
+$(call if_changed,ld_ko_o)
targets += $(modules) $(modules:.ko=.mod.o)

3
scripts/module-common.lds → scripts/module.lds.S
View File

@ -24,3 +24,6 @@ SECTIONS {
__jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) }
}
/* bring in arch-specific sections */
#include <asm/module.lds.h>

2
scripts/package/builddeb
View File

@ -55,7 +55,7 @@ deploy_kernel_headers () {
cd $srctree
find . arch/$SRCARCH -maxdepth 1 -name Makefile\*
find include scripts -type f -o -type l
find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform
find arch/$SRCARCH -name Kbuild.platforms -o -name Platform
find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f
) > debian/hdrsrcfiles