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authorVincenzo Frascino <vincenzo.frascino@arm.com>2019-06-21 11:52:42 +0200
committerThomas Gleixner <tglx@linutronix.de>2019-06-22 21:21:09 +0200
commitbfe801ebe84f42b4666d3f0adde90f504d56e35b (patch)
treed3c10713cb38ea30e4b6f410d194c0ec1d7ef098 /arch/arm64
parentarm64: compat: Get sigreturn trampolines from vDSO (diff)
downloadlinux-bfe801ebe84f42b4666d3f0adde90f504d56e35b.tar.xz
linux-bfe801ebe84f42b4666d3f0adde90f504d56e35b.zip
arm64: vdso: Enable vDSO compat support
Add vDSO compat support to the arm64 build system. Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Shijith Thotton <sthotton@marvell.com> Tested-by: Andre Przywara <andre.przywara@arm.com> Cc: linux-arch@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mips@vger.kernel.org Cc: linux-kselftest@vger.kernel.org Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Russell King <linux@armlinux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paul Burton <paul.burton@mips.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Mark Salyzyn <salyzyn@android.com> Cc: Peter Collingbourne <pcc@google.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Huw Davies <huw@codeweavers.com> Link: https://lkml.kernel.org/r/20190621095252.32307-16-vincenzo.frascino@arm.com
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/Kconfig1
-rw-r--r--arch/arm64/Makefile23
-rw-r--r--arch/arm64/kernel/Makefile6
3 files changed, 27 insertions, 3 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 952c9f8cf3b8..f5eb592b8579 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -108,6 +108,7 @@ config ARM64
select GENERIC_STRNLEN_USER
select GENERIC_TIME_VSYSCALL
select GENERIC_GETTIMEOFDAY
+ select GENERIC_COMPAT_VDSO if (!CPU_BIG_ENDIAN && COMPAT)
select HANDLE_DOMAIN_IRQ
select HARDIRQS_SW_RESEND
select HAVE_PCI
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index e9d2e578cbe6..e3d3fd0a4268 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -49,10 +49,26 @@ $(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_COMPAT ?= $(CONFIG_CROSS_COMPILE_COMPAT_VDSO:"%"=%)
+
+ ifeq ($(CONFIG_CC_IS_CLANG), y)
+ $(warning CROSS_COMPILE_COMPAT is clang, the compat vDSO will not be built)
+ else ifeq ($(CROSS_COMPILE_COMPAT),)
+ $(warning CROSS_COMPILE_COMPAT not defined or empty, the compat vDSO will not be built)
+ else ifeq ($(shell which $(CROSS_COMPILE_COMPAT)gcc 2> /dev/null),)
+ $(error $(CROSS_COMPILE_COMPAT)gcc not found, check CROSS_COMPILE_COMPAT)
+ else
+ export CROSS_COMPILE_COMPAT
+ 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_CFLAGS += $(call cc-disable-warning, psabi)
-KBUILD_AFLAGS += $(lseinstr) $(brokengasinst)
+KBUILD_AFLAGS += $(lseinstr) $(brokengasinst) $(compat_vdso)
KBUILD_CFLAGS += $(call cc-option,-mabi=lp64)
KBUILD_AFLAGS += $(call cc-option,-mabi=lp64)
@@ -164,6 +180,9 @@ ifeq ($(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 9e7dcb2c31c7..478491f07b4f 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -28,7 +28,10 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
$(call if_changed,objcopy)
obj-$(CONFIG_COMPAT) += sys32.o signal32.o \
- sigreturn32.o sys_compat.o
+ sys_compat.o
+ifneq ($(CONFIG_COMPAT_VDSO), y)
+obj-$(CONFIG_COMPAT) += sigreturn32.o
+endif
obj-$(CONFIG_KUSER_HELPERS) += kuser32.o
obj-$(CONFIG_FUNCTION_TRACER) += ftrace.o entry-ftrace.o
obj-$(CONFIG_MODULES) += module.o
@@ -62,6 +65,7 @@ obj-$(CONFIG_ARM64_SSBD) += ssbd.o
obj-$(CONFIG_ARM64_PTR_AUTH) += pointer_auth.o
obj-y += vdso/ probes/
+obj-$(CONFIG_COMPAT_VDSO) += vdso32/
head-y := head.o
extra-y += $(head-y) vmlinux.lds