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Fri, 09 Oct 2020 09:13:42 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:10 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-2-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 01/29] kbuild: preprocess module linker script From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_121346_864152_D2855AF7 X-CRM114-Status: GOOD ( 22.92 ) X-Spam-Score: -7.7 (-------) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-7.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:449 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Masahiro Yamada 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 . Signed-off-by: Masahiro Yamada Tested-by: Jessica Yu Acked-by: Will Deacon Acked-by: Geert Uytterhoeven Acked-by: Palmer Dabbelt Reviewed-by: Kees Cook Acked-by: Jessica Yu --- Makefile | 10 ++++++---- arch/arm/Makefile | 4 ---- .../{kernel/module.lds => include/asm/module.lds.h} | 2 ++ arch/arm64/Makefile | 4 ---- .../{kernel/module.lds => include/asm/module.lds.h} | 2 ++ arch/ia64/Makefile | 1 - arch/ia64/{module.lds => include/asm/module.lds.h} | 0 arch/m68k/Makefile | 1 - .../{kernel/module.lds => include/asm/module.lds.h} | 0 arch/powerpc/Makefile | 1 - .../{kernel/module.lds => include/asm/module.lds.h} | 0 arch/riscv/Makefile | 3 --- .../{kernel/module.lds => include/asm/module.lds.h} | 3 ++- arch/um/include/asm/Kbuild | 1 + include/asm-generic/Kbuild | 1 + include/asm-generic/module.lds.h | 10 ++++++++++ scripts/.gitignore | 1 + scripts/Makefile | 3 +++ scripts/Makefile.modfinal | 5 ++--- scripts/{module-common.lds => module.lds.S} | 3 +++ scripts/package/builddeb | 2 +- 21 files changed, 34 insertions(+), 23 deletions(-) rename arch/arm/{kernel/module.lds => include/asm/module.lds.h} (72%) rename arch/arm64/{kernel/module.lds => include/asm/module.lds.h} (76%) rename arch/ia64/{module.lds => include/asm/module.lds.h} (100%) rename arch/m68k/{kernel/module.lds => include/asm/module.lds.h} (100%) rename arch/powerpc/{kernel/module.lds => include/asm/module.lds.h} (100%) rename arch/riscv/{kernel/module.lds => include/asm/module.lds.h} (84%) create mode 100644 include/asm-generic/module.lds.h rename scripts/{module-common.lds => module.lds.S} (93%) diff --git a/Makefile b/Makefile index f84d7e4ca0be..a913a6829754 100644 --- a/Makefile +++ b/Makefile @@ -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 := @@ -1384,7 +1383,7 @@ 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 @@ -1401,6 +1400,7 @@ 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 @@ -1722,7 +1722,9 @@ 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 @@ -1755,7 +1757,7 @@ 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 diff --git a/arch/arm/Makefile b/arch/arm/Makefile index e589da3c8949..9c4d19ae7d61 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -20,10 +20,6 @@ endif # linker. All sections should be explicitly named in the linker script. LDFLAGS_vmlinux += $(call ld-option, --orphan-handling=warn) -ifeq ($(CONFIG_ARM_MODULE_PLTS),y) -KBUILD_LDS_MODULE += $(srctree)/arch/arm/kernel/module.lds -endif - GZFLAGS :=-9 #KBUILD_CFLAGS +=-pipe diff --git a/arch/arm/kernel/module.lds b/arch/arm/include/asm/module.lds.h similarity index 72% rename from arch/arm/kernel/module.lds rename to arch/arm/include/asm/module.lds.h index 79cb6af565e5..0e7cb4e314b4 100644 --- a/arch/arm/kernel/module.lds +++ b/arch/arm/include/asm/module.lds.h @@ -1,5 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0 */ +#ifdef CONFIG_ARM_MODULE_PLTS SECTIONS { .plt : { BYTE(0) } .init.plt : { BYTE(0) } } +#endif diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index aff994473eb2..32d7e07b0acf 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -127,10 +127,6 @@ endif CHECKFLAGS += -D__aarch64__ -ifeq ($(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 diff --git a/arch/arm64/kernel/module.lds b/arch/arm64/include/asm/module.lds.h similarity index 76% rename from arch/arm64/kernel/module.lds rename to arch/arm64/include/asm/module.lds.h index 22e36a21c113..691f15af788e 100644 --- a/arch/arm64/kernel/module.lds +++ b/arch/arm64/include/asm/module.lds.h @@ -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 diff --git a/arch/ia64/Makefile b/arch/ia64/Makefile index 2876a7df1b0a..703b1c4f6d12 100644 --- a/arch/ia64/Makefile +++ b/arch/ia64/Makefile @@ -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 := diff --git a/arch/ia64/module.lds b/arch/ia64/include/asm/module.lds.h similarity index 100% rename from arch/ia64/module.lds rename to arch/ia64/include/asm/module.lds.h diff --git a/arch/m68k/Makefile b/arch/m68k/Makefile index 4438ffb4bbe1..ea14f2046fb4 100644 --- a/arch/m68k/Makefile +++ b/arch/m68k/Makefile @@ -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 diff --git a/arch/m68k/kernel/module.lds b/arch/m68k/include/asm/module.lds.h similarity index 100% rename from arch/m68k/kernel/module.lds rename to arch/m68k/include/asm/module.lds.h diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index 3e8da9cf2eb9..8935658fcd06 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -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 diff --git a/arch/powerpc/kernel/module.lds b/arch/powerpc/include/asm/module.lds.h similarity index 100% rename from arch/powerpc/kernel/module.lds rename to arch/powerpc/include/asm/module.lds.h diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile index fb6e37db836d..8edaa8bd86d6 100644 --- a/arch/riscv/Makefile +++ b/arch/riscv/Makefile @@ -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 diff --git a/arch/riscv/kernel/module.lds b/arch/riscv/include/asm/module.lds.h similarity index 84% rename from arch/riscv/kernel/module.lds rename to arch/riscv/include/asm/module.lds.h index 295ecfb341a2..4254ff2ff049 100644 --- a/arch/riscv/kernel/module.lds +++ b/arch/riscv/include/asm/module.lds.h @@ -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 diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild index 8d435f8a6dec..1c63b260ecc4 100644 --- a/arch/um/include/asm/Kbuild +++ b/arch/um/include/asm/Kbuild @@ -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 diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild index 74b0612601dd..7cd4e627e00e 100644 --- a/include/asm-generic/Kbuild +++ b/include/asm-generic/Kbuild @@ -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 diff --git a/include/asm-generic/module.lds.h b/include/asm-generic/module.lds.h new file mode 100644 index 000000000000..f210d5c1b78b --- /dev/null +++ b/include/asm-generic/module.lds.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __ASM_GENERIC_MODULE_LDS_H +#define __ASM_GENERIC_MODULE_LDS_H + +/* + * can specify arch-specific sections for linking modules. + * Empty for the asm-generic header. + */ + +#endif /* __ASM_GENERIC_MODULE_LDS_H */ diff --git a/scripts/.gitignore b/scripts/.gitignore index 0d1c8e217cd7..a6c11316c969 100644 --- a/scripts/.gitignore +++ b/scripts/.gitignore @@ -8,3 +8,4 @@ asn1_compiler extract-cert sign-file insert-sys-cert +/module.lds diff --git a/scripts/Makefile b/scripts/Makefile index bc018e4b733e..b5418ec587fb 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -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 diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal index 411c1e600e7d..ae01baf96f4e 100644 --- a/scripts/Makefile.modfinal +++ b/scripts/Makefile.modfinal @@ -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) diff --git a/scripts/module-common.lds b/scripts/module.lds.S similarity index 93% rename from scripts/module-common.lds rename to scripts/module.lds.S index d61b9e8678e8..69b9b71a6a47 100644 --- a/scripts/module-common.lds +++ b/scripts/module.lds.S @@ -24,3 +24,6 @@ SECTIONS { __jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) } } + +/* bring in arch-specific sections */ +#include diff --git a/scripts/package/builddeb b/scripts/package/builddeb index 6df3c9f8b2da..44f212e37935 100755 --- a/scripts/package/builddeb +++ b/scripts/package/builddeb @@ -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