From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from foss.arm.com ([217.140.101.70]:40134 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730241AbeK3EMu (ORCPT ); Thu, 29 Nov 2018 23:12:50 -0500 From: Vincenzo Frascino Subject: [PATCH v2 22/28] arm64: Add vDSO compat support Date: Thu, 29 Nov 2018 17:05:24 +0000 Message-ID: <20181129170530.37789-23-vincenzo.frascino@arm.com> In-Reply-To: <20181129170530.37789-1-vincenzo.frascino@arm.com> References: <20181129170530.37789-1-vincenzo.frascino@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Catalin Marinas , Will Deacon , Arnd Bergmann , Russell King , Ralf Baechle , Paul Burton , Daniel Lezcano , Thomas Gleixner , Mark Salyzyn , Peter Collingbourne Message-ID: <20181129170524.cEEveA_SvWixFzevdRpk05BT4qTHTe49-LU5cICyiNk@z> This patch adds vDSO compat support to the arm64 building system. Cc: Catalin Marinas Cc: Will Deacon Signed-off-by: Vincenzo Frascino --- arch/arm64/Kconfig | 1 + arch/arm64/Makefile | 21 +++++++++++++++++++-- arch/arm64/kernel/Makefile | 6 +++++- 3 files changed, 25 insertions(+), 3 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 2c7d447401b5..79829ddf7cc9 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -103,6 +103,7 @@ config ARM64 select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY + select GENERIC_COMPAT_VDSO select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_ACPI_APEI if (ACPI && EFI) diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile index 6cb9fc7e9382..814d2b0ac017 100644 --- a/arch/arm64/Makefile +++ b/arch/arm64/Makefile @@ -49,9 +49,23 @@ $(warning Detected assembler with broken .inst; disassembly will be unreliable) endif endif -KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) +ifeq ($(CONFIG_GENERIC_COMPAT_VDSO), y) + CROSS_COMPILE_ARM32 ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%) + + ifeq ($(CROSS_COMPILE_ARM32),) + $(warning CROSS_COMPILE_ARM32 not defined or empty, the compat vDSO will not be built) + else ifeq ($(shell which $(CROSS_COMPILE_ARM32)gcc 2> /dev/null),) + $(error $(CROSS_COMPILE_ARM32)gcc not found, check CROSS_COMPILE_ARM32) + else + export CROSS_COMPILE_ARM32 + export CONFIG_COMPAT_VDSO := y + compat_vdso := -DCONFIG_COMPAT_VDSO=1 + endif +endif + +KBUILD_CFLAGS += -mgeneral-regs-only $(lseinstr) $(brokengasinst) $(compat_vdso) KBUILD_CFLAGS += -fno-asynchronous-unwind-tables -KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) +KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso) KBUILD_CFLAGS += $(call cc-option,-mabi=lp64) KBUILD_AFLAGS += $(call cc-option,-mabi=lp64) @@ -144,6 +158,9 @@ ifeq ($(KBUILD_EXTMOD),) prepare: vdso_prepare vdso_prepare: prepare0 $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h + $(if $(CONFIG_COMPAT_VDSO),$(Q)$(MAKE) \ + $(build)=arch/arm64/kernel/vdso32 \ + include/generated/vdso32-offsets.h) endif define archhelp diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 2fcba6b87829..29234a70d168 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -28,7 +28,10 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE $(call if_changed,objcopy) arm64-obj-$(CONFIG_COMPAT) += sys32.o signal32.o \ - sigreturn32.o sys_compat.o + sys_compat.o +ifneq ($(CONFIG_COMPAT_VDSO), y) +arm64-obj-$(CONFIG_COMPAT) += sigreturn32.o +endif arm64-obj-$(CONFIG_KUSER_HELPERS) += kuser32.o arm64-obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o @@ -60,6 +63,7 @@ arm64-obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o arm64-obj-$(CONFIG_ARM64_SSBD) += ssbd.o obj-y += $(arm64-obj-y) vdso/ probes/ +obj-$(CONFIG_COMPAT_VDSO) += vdso32/ obj-m += $(arm64-obj-m) head-y := head.o extra-y += $(head-y) vmlinux.lds -- 2.19.2