diff options
Diffstat (limited to 'arch/arm64/kernel/vdso32/Makefile')
| -rw-r--r-- | arch/arm64/kernel/vdso32/Makefile | 71 |
1 files changed, 30 insertions, 41 deletions
diff --git a/arch/arm64/kernel/vdso32/Makefile b/arch/arm64/kernel/vdso32/Makefile index 04df57b43cb1..36c8f66cad25 100644 --- a/arch/arm64/kernel/vdso32/Makefile +++ b/arch/arm64/kernel/vdso32/Makefile @@ -11,18 +11,21 @@ include $(srctree)/lib/vdso/Makefile # Same as cc-*option, but using CC_COMPAT instead of CC ifeq ($(CONFIG_CC_IS_CLANG), y) CC_COMPAT ?= $(CC) +CC_COMPAT += --target=arm-linux-gnueabi else CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc endif +ifeq ($(CONFIG_LD_IS_LLD), y) +LD_COMPAT ?= $(LD) +else +LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld +endif + cc32-option = $(call try-run,\ $(CC_COMPAT) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) cc32-disable-warning = $(call try-run,\ $(CC_COMPAT) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) -cc32-ldoption = $(call try-run,\ - $(CC_COMPAT) $(1) -nostdlib -x c /dev/null -o "$$TMP",$(1),$(2)) -cc32-as-instr = $(call try-run,\ - printf "%b\n" "$(1)" | $(CC_COMPAT) $(VDSO_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) # We cannot use the global flags to compile the vDSO files, the main reason # being that the 32-bit compiler may be older than the main (64-bit) compiler @@ -32,16 +35,13 @@ cc32-as-instr = $(call try-run,\ # As a result we set our own flags here. # KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile -VDSO_CPPFLAGS := -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include) +VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -nostdinc +VDSO_CPPFLAGS += -isystem $(shell $(CC_COMPAT) -print-file-name=include 2>/dev/null) VDSO_CPPFLAGS += $(LINUXINCLUDE) # Common C and assembly flags # From top-level Makefile VDSO_CAFLAGS := $(VDSO_CPPFLAGS) -ifneq ($(shell $(CC_COMPAT) --version 2>&1 | head -n 1 | grep clang),) -VDSO_CAFLAGS += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%)) -endif - VDSO_CAFLAGS += $(call cc32-option,-fno-PIE) ifdef CONFIG_DEBUG_INFO VDSO_CAFLAGS += -g @@ -59,13 +59,7 @@ endif # From arm vDSO Makefile VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING - - -# Try to compile for ARMv8. If the compiler is too old and doesn't support it, -# fall back to v7. There is no easy way to check for what architecture the code -# is being compiled, so define a macro specifying that (see arch/arm/Makefile). -VDSO_CAFLAGS += $(call cc32-option,-march=armv8-a -D__LINUX_ARM_ARCH__=8,\ - -march=armv7-a -D__LINUX_ARM_ARCH__=7) +VDSO_CAFLAGS += -march=armv8-a VDSO_CFLAGS := $(VDSO_CAFLAGS) VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1 @@ -74,14 +68,15 @@ VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ -fno-strict-aliasing -fno-common \ -Werror-implicit-function-declaration \ -Wno-format-security \ - -std=gnu89 + -Wdeclaration-after-statement \ + -std=gnu11 VDSO_CFLAGS += -O2 # Some useful compiler-dependent flags from top-level Makefile VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,) VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign) -VDSO_CFLAGS += $(call cc32-option,-fno-strict-overflow) +VDSO_CFLAGS += -fno-strict-overflow VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes) -VDSO_CFLAGS += $(call cc32-option,-Werror=date-time) +VDSO_CFLAGS += -Werror=date-time VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types) # The 32-bit compiler does not provide 128-bit integers, which are used in @@ -94,23 +89,22 @@ VDSO_CFLAGS += -D__uint128_t='void*' VDSO_CFLAGS += $(call cc32-disable-warning,shift-count-overflow) VDSO_CFLAGS += -Wno-int-to-pointer-cast +# Compile as THUMB2 or ARM. Unwinding via frame-pointers in THUMB2 is +# unreliable. +ifeq ($(CONFIG_THUMB2_COMPAT_VDSO), y) +VDSO_CFLAGS += -mthumb -fomit-frame-pointer +else +VDSO_CFLAGS += -marm +endif + VDSO_AFLAGS := $(VDSO_CAFLAGS) VDSO_AFLAGS += -D__ASSEMBLY__ -# Check for binutils support for dmb ishld -dmbinstr := $(call cc32-as-instr,dmb ishld,-DCONFIG_AS_DMB_ISHLD=1) - -VDSO_CFLAGS += $(dmbinstr) -VDSO_AFLAGS += $(dmbinstr) - -VDSO_LDFLAGS := $(VDSO_CPPFLAGS) # From arm vDSO Makefile -VDSO_LDFLAGS += -Wl,-Bsymbolic -Wl,--no-undefined -Wl,-soname=linux-vdso.so.1 -VDSO_LDFLAGS += -Wl,-z,max-page-size=4096 -Wl,-z,common-page-size=4096 -VDSO_LDFLAGS += -nostdlib -shared -mfloat-abi=soft -VDSO_LDFLAGS += -Wl,--hash-style=sysv -VDSO_LDFLAGS += -Wl,--build-id -VDSO_LDFLAGS += $(call cc32-ldoption,-fuse-ld=bfd) +VDSO_LDFLAGS += -Bsymbolic --no-undefined -soname=linux-vdso.so.1 +VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096 +VDSO_LDFLAGS += -shared --hash-style=sysv --build-id=sha1 +VDSO_LDFLAGS += --orphan-handling=warn # Borrow vdsomunge.c from the arm vDSO @@ -121,7 +115,6 @@ hostprogs := $(munge) c-obj-vdso := note.o c-obj-vdso-gettimeofday := vgettimeofday.o -asm-obj-vdso := sigreturn.o ifneq ($(c-gettimeofday-y),) VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y) @@ -136,13 +129,9 @@ c-obj-vdso-gettimeofday := $(addprefix $(obj)/, $(c-obj-vdso-gettimeofday)) asm-obj-vdso := $(addprefix $(obj)/, $(asm-obj-vdso)) obj-vdso := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso) -obj-y += vdso.o -extra-y += vdso.lds +targets += vdso.lds CPPFLAGS_vdso.lds += -P -C -U$(ARCH) -# Force dependency (vdso.s includes vdso.so through incbin) -$(obj)/vdso.o: $(obj)/vdso.so - include/generated/vdso32-offsets.h: $(obj)/vdso.so.dbg FORCE $(call if_changed,vdsosym) @@ -171,8 +160,8 @@ quiet_cmd_vdsold_and_vdso_check = LD32 $@ cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check) quiet_cmd_vdsold = LD32 $@ - cmd_vdsold = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_LDFLAGS) \ - -Wl,-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ + cmd_vdsold = $(LD_COMPAT) $(VDSO_LDFLAGS) \ + -T $(filter %.lds,$^) $(filter %.o,$^) -o $@ quiet_cmd_vdsocc = CC32 $@ cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $< quiet_cmd_vdsocc_gettimeofday = CC32 $@ @@ -190,7 +179,7 @@ quiet_cmd_vdsosym = VDSOSYM $@ cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ # Install commands for the unstripped file -quiet_cmd_vdso_install = INSTALL $@ +quiet_cmd_vdso_install = INSTALL32 $@ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/vdso32.so vdso.so: $(obj)/vdso.so.dbg |