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218 lines
7.8 KiB
218 lines
7.8 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Makefile for vdso32 |
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# |
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# Absolute relocation type $(ARCH_REL_TYPE_ABS) needs to be defined before |
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# the inclusion of generic Makefile. |
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ARCH_REL_TYPE_ABS := R_ARM_JUMP_SLOT|R_ARM_GLOB_DAT|R_ARM_ABS32 |
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include $(srctree)/lib/vdso/Makefile |
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# Same as cc-*option, but using CC_COMPAT instead of CC |
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ifeq ($(CONFIG_CC_IS_CLANG), y) |
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COMPAT_GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE_COMPAT)elfedit)) |
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COMPAT_GCC_TOOLCHAIN := $(realpath $(COMPAT_GCC_TOOLCHAIN_DIR)/..) |
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CC_COMPAT_CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%)) |
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CC_COMPAT_CLANG_FLAGS += --prefix=$(COMPAT_GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE_COMPAT)) |
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CC_COMPAT_CLANG_FLAGS += -no-integrated-as -Qunused-arguments |
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ifneq ($(COMPAT_GCC_TOOLCHAIN),) |
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CC_COMPAT_CLANG_FLAGS += --gcc-toolchain=$(COMPAT_GCC_TOOLCHAIN) |
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endif |
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CC_COMPAT ?= $(CC) |
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CC_COMPAT += $(CC_COMPAT_CLANG_FLAGS) |
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ifneq ($(LLVM),) |
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LD_COMPAT ?= $(LD) |
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else |
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LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld |
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endif |
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else |
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CC_COMPAT ?= $(CROSS_COMPILE_COMPAT)gcc |
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LD_COMPAT ?= $(CROSS_COMPILE_COMPAT)ld |
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endif |
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cc32-option = $(call try-run,\ |
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$(CC_COMPAT) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) |
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cc32-disable-warning = $(call try-run,\ |
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$(CC_COMPAT) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1))) |
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cc32-as-instr = $(call try-run,\ |
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printf "%b\n" "$(1)" | $(CC_COMPAT) $(VDSO_AFLAGS) -c -x assembler -o "$$TMP" -,$(2),$(3)) |
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# We cannot use the global flags to compile the vDSO files, the main reason |
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# being that the 32-bit compiler may be older than the main (64-bit) compiler |
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# and therefore may not understand flags set using $(cc-option ...). Besides, |
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# arch-specific options should be taken from the arm Makefile instead of the |
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# arm64 one. |
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# As a result we set our own flags here. |
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# KBUILD_CPPFLAGS and NOSTDINC_FLAGS from top-level Makefile |
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VDSO_CPPFLAGS := -DBUILD_VDSO -D__KERNEL__ -nostdinc -isystem $(shell $(CC_COMPAT) -print-file-name=include) |
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VDSO_CPPFLAGS += $(LINUXINCLUDE) |
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# Common C and assembly flags |
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# From top-level Makefile |
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VDSO_CAFLAGS := $(VDSO_CPPFLAGS) |
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ifneq ($(shell $(CC_COMPAT) --version 2>&1 | head -n 1 | grep clang),) |
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VDSO_CAFLAGS += --target=$(notdir $(CROSS_COMPILE_COMPAT:%-=%)) |
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endif |
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VDSO_CAFLAGS += $(call cc32-option,-fno-PIE) |
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ifdef CONFIG_DEBUG_INFO |
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VDSO_CAFLAGS += -g |
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endif |
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# From arm Makefile |
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VDSO_CAFLAGS += $(call cc32-option,-fno-dwarf2-cfi-asm) |
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VDSO_CAFLAGS += -mabi=aapcs-linux -mfloat-abi=soft |
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ifeq ($(CONFIG_CPU_BIG_ENDIAN), y) |
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VDSO_CAFLAGS += -mbig-endian |
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else |
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VDSO_CAFLAGS += -mlittle-endian |
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endif |
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# From arm vDSO Makefile |
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VDSO_CAFLAGS += -fPIC -fno-builtin -fno-stack-protector |
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VDSO_CAFLAGS += -DDISABLE_BRANCH_PROFILING |
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# Try to compile for ARMv8. If the compiler is too old and doesn't support it, |
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# fall back to v7. There is no easy way to check for what architecture the code |
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# is being compiled, so define a macro specifying that (see arch/arm/Makefile). |
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VDSO_CAFLAGS += $(call cc32-option,-march=armv8-a -D__LINUX_ARM_ARCH__=8,\ |
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-march=armv7-a -D__LINUX_ARM_ARCH__=7) |
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VDSO_CFLAGS := $(VDSO_CAFLAGS) |
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VDSO_CFLAGS += -DENABLE_COMPAT_VDSO=1 |
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# KBUILD_CFLAGS from top-level Makefile |
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VDSO_CFLAGS += -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ |
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-fno-strict-aliasing -fno-common \ |
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-Werror-implicit-function-declaration \ |
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-Wno-format-security \ |
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-std=gnu89 |
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VDSO_CFLAGS += -O2 |
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# Some useful compiler-dependent flags from top-level Makefile |
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VDSO_CFLAGS += $(call cc32-option,-Wdeclaration-after-statement,) |
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VDSO_CFLAGS += $(call cc32-option,-Wno-pointer-sign) |
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VDSO_CFLAGS += -fno-strict-overflow |
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VDSO_CFLAGS += $(call cc32-option,-Werror=strict-prototypes) |
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VDSO_CFLAGS += -Werror=date-time |
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VDSO_CFLAGS += $(call cc32-option,-Werror=incompatible-pointer-types) |
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# The 32-bit compiler does not provide 128-bit integers, which are used in |
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# some headers that are indirectly included from the vDSO code. |
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# This hack makes the compiler happy and should trigger a warning/error if |
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# variables of such type are referenced. |
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VDSO_CFLAGS += -D__uint128_t='void*' |
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# Silence some warnings coming from headers that operate on long's |
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# (on GCC 4.8 or older, there is unfortunately no way to silence this warning) |
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VDSO_CFLAGS += $(call cc32-disable-warning,shift-count-overflow) |
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VDSO_CFLAGS += -Wno-int-to-pointer-cast |
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# Compile as THUMB2 or ARM. Unwinding via frame-pointers in THUMB2 is |
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# unreliable. |
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ifeq ($(CONFIG_THUMB2_COMPAT_VDSO), y) |
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VDSO_CFLAGS += -mthumb -fomit-frame-pointer |
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else |
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VDSO_CFLAGS += -marm |
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endif |
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VDSO_AFLAGS := $(VDSO_CAFLAGS) |
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VDSO_AFLAGS += -D__ASSEMBLY__ |
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# Check for binutils support for dmb ishld |
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dmbinstr := $(call cc32-as-instr,dmb ishld,-DCONFIG_AS_DMB_ISHLD=1) |
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VDSO_CFLAGS += $(dmbinstr) |
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VDSO_AFLAGS += $(dmbinstr) |
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# From arm vDSO Makefile |
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VDSO_LDFLAGS += -Bsymbolic --no-undefined -soname=linux-vdso.so.1 |
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VDSO_LDFLAGS += -z max-page-size=4096 -z common-page-size=4096 |
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VDSO_LDFLAGS += -nostdlib -shared --hash-style=sysv --build-id=sha1 |
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# Borrow vdsomunge.c from the arm vDSO |
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# We have to use a relative path because scripts/Makefile.host prefixes |
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# $(hostprogs) with $(obj) |
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munge := ../../../arm/vdso/vdsomunge |
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hostprogs := $(munge) |
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c-obj-vdso := note.o |
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c-obj-vdso-gettimeofday := vgettimeofday.o |
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ifneq ($(c-gettimeofday-y),) |
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VDSO_CFLAGS_gettimeofday_o += -include $(c-gettimeofday-y) |
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endif |
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VDSO_CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os |
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# Build rules |
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targets := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso) vdso.so vdso.so.dbg vdso.so.raw |
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c-obj-vdso := $(addprefix $(obj)/, $(c-obj-vdso)) |
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c-obj-vdso-gettimeofday := $(addprefix $(obj)/, $(c-obj-vdso-gettimeofday)) |
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asm-obj-vdso := $(addprefix $(obj)/, $(asm-obj-vdso)) |
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obj-vdso := $(c-obj-vdso) $(c-obj-vdso-gettimeofday) $(asm-obj-vdso) |
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targets += vdso.lds |
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
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# Force dependency (vdso.s includes vdso.so through incbin) |
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$(obj)/vdso.o: $(obj)/vdso.so |
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include/generated/vdso32-offsets.h: $(obj)/vdso.so.dbg FORCE |
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$(call if_changed,vdsosym) |
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# Strip rule for vdso.so |
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$(obj)/vdso.so: OBJCOPYFLAGS := -S |
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$(obj)/vdso.so: $(obj)/vdso.so.dbg FORCE |
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$(call if_changed,objcopy) |
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$(obj)/vdso.so.dbg: $(obj)/vdso.so.raw $(obj)/$(munge) FORCE |
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$(call if_changed,vdsomunge) |
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# Link rule for the .so file, .lds has to be first |
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$(obj)/vdso.so.raw: $(src)/vdso.lds $(obj-vdso) FORCE |
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$(call if_changed,vdsold_and_vdso_check) |
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# Compilation rules for the vDSO sources |
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$(c-obj-vdso): %.o: %.c FORCE |
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$(call if_changed_dep,vdsocc) |
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$(c-obj-vdso-gettimeofday): %.o: %.c FORCE |
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$(call if_changed_dep,vdsocc_gettimeofday) |
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$(asm-obj-vdso): %.o: %.S FORCE |
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$(call if_changed_dep,vdsoas) |
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# Actual build commands |
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quiet_cmd_vdsold_and_vdso_check = LD32 $@ |
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cmd_vdsold_and_vdso_check = $(cmd_vdsold); $(cmd_vdso_check) |
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quiet_cmd_vdsold = LD32 $@ |
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cmd_vdsold = $(LD_COMPAT) $(VDSO_LDFLAGS) \ |
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-T $(filter %.lds,$^) $(filter %.o,$^) -o $@ |
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quiet_cmd_vdsocc = CC32 $@ |
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cmd_vdsocc = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) -c -o $@ $< |
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quiet_cmd_vdsocc_gettimeofday = CC32 $@ |
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cmd_vdsocc_gettimeofday = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_CFLAGS) $(VDSO_CFLAGS_gettimeofday_o) -c -o $@ $< |
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quiet_cmd_vdsoas = AS32 $@ |
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cmd_vdsoas = $(CC_COMPAT) -Wp,-MD,$(depfile) $(VDSO_AFLAGS) -c -o $@ $< |
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quiet_cmd_vdsomunge = MUNGE $@ |
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cmd_vdsomunge = $(obj)/$(munge) $< $@ |
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# Generate vDSO offsets using helper script (borrowed from the 64-bit vDSO) |
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gen-vdsosym := $(srctree)/$(src)/../vdso/gen_vdso_offsets.sh |
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quiet_cmd_vdsosym = VDSOSYM $@ |
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# The AArch64 nm should be able to read an AArch32 binary |
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cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@ |
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# Install commands for the unstripped file |
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quiet_cmd_vdso_install = INSTALL32 $@ |
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/vdso32.so |
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vdso.so: $(obj)/vdso.so.dbg |
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@mkdir -p $(MODLIB)/vdso |
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$(call cmd,vdso_install) |
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vdso_install: vdso.so
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