diff options
Diffstat (limited to 'arch/powerpc/kernel/vdso/Makefile')
| -rw-r--r-- | arch/powerpc/kernel/vdso/Makefile | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vdso/Makefile b/arch/powerpc/kernel/vdso/Makefile new file mode 100644 index 0000000000..0c7d82c270 --- /dev/null +++ b/arch/powerpc/kernel/vdso/Makefile @@ -0,0 +1,118 @@ +# SPDX-License-Identifier: GPL-2.0 + +# List of files in the vdso, has to be asm only for now + +# Include the generic Makefile to check the built vdso. +include $(srctree)/lib/vdso/Makefile + +obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o +obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o + +ifneq ($(c-gettimeofday-y),) + CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y) + CFLAGS_vgettimeofday-32.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + CFLAGS_vgettimeofday-32.o += $(call cc-option, -fno-stack-protector) + CFLAGS_vgettimeofday-32.o += -DDISABLE_BRANCH_PROFILING + CFLAGS_vgettimeofday-32.o += -ffreestanding -fasynchronous-unwind-tables + CFLAGS_REMOVE_vgettimeofday-32.o = $(CC_FLAGS_FTRACE) + CFLAGS_REMOVE_vgettimeofday-32.o += -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc + # This flag is supported by clang for 64-bit but not 32-bit so it will cause + # an unused command line flag warning for this file. + ifdef CONFIG_CC_IS_CLANG + CFLAGS_REMOVE_vgettimeofday-32.o += -fno-stack-clash-protection + endif + CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) + CFLAGS_vgettimeofday-64.o += $(DISABLE_LATENT_ENTROPY_PLUGIN) + CFLAGS_vgettimeofday-64.o += $(call cc-option, -fno-stack-protector) + CFLAGS_vgettimeofday-64.o += -DDISABLE_BRANCH_PROFILING + CFLAGS_vgettimeofday-64.o += -ffreestanding -fasynchronous-unwind-tables + CFLAGS_REMOVE_vgettimeofday-64.o = $(CC_FLAGS_FTRACE) +# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true +# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is +# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code +# generation is minimal, it will just use r29 instead. + CFLAGS_vgettimeofday-64.o += $(call cc-option, -ffixed-r30) +endif + +# Build rules + +ifdef CROSS32_COMPILE + VDSOCC := $(CROSS32_COMPILE)gcc +else + VDSOCC := $(CC) +endif + +targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o +obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) +targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o +obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) + +GCOV_PROFILE := n +KCOV_INSTRUMENT := n +UBSAN_SANITIZE := n +KASAN_SANITIZE := n +KCSAN_SANITIZE := n + +ccflags-y := -fno-common -fno-builtin +ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS) +ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) +ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) + +# Filter flags that clang will warn are unused for linking +ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CFLAGS)) + +CC32FLAGS := -m32 +LD32FLAGS := -Wl,-soname=linux-vdso32.so.1 +AS32FLAGS := -D__VDSO32__ + +LD64FLAGS := -Wl,-soname=linux-vdso64.so.1 +AS64FLAGS := -D__VDSO64__ + +targets += vdso32.lds +CPPFLAGS_vdso32.lds += -P -C -Upowerpc +targets += vdso64.lds +CPPFLAGS_vdso64.lds += -P -C -U$(ARCH) + +# link rule for the .so file, .lds has to be first +$(obj)/vdso32.so.dbg: $(src)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o FORCE + $(call if_changed,vdso32ld_and_check) +$(obj)/vdso64.so.dbg: $(src)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o FORCE + $(call if_changed,vdso64ld_and_check) + +# assembly rules for the .S files +$(obj-vdso32): %-32.o: %.S FORCE + $(call if_changed_dep,vdso32as) +$(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE + $(call if_changed_dep,vdso32cc) +$(obj-vdso64): %-64.o: %.S FORCE + $(call if_changed_dep,vdso64as) +$(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE + $(call if_changed_dep,cc_o_c) + +# Generate VDSO offsets using helper script +gen-vdso32sym := $(srctree)/$(src)/gen_vdso32_offsets.sh +quiet_cmd_vdso32sym = VDSO32SYM $@ + cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ +gen-vdso64sym := $(srctree)/$(src)/gen_vdso64_offsets.sh +quiet_cmd_vdso64sym = VDSO64SYM $@ + cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@ + +include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE + $(call if_changed,vdso32sym) +include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE + $(call if_changed,vdso64sym) + +# actual build commands +quiet_cmd_vdso32ld_and_check = VDSO32L $@ + cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) +quiet_cmd_vdso32as = VDSO32A $@ + cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $< +quiet_cmd_vdso32cc = VDSO32C $@ + cmd_vdso32cc = $(VDSOCC) $(c_flags) $(CC32FLAGS) -c -o $@ $< + +quiet_cmd_vdso64ld_and_check = VDSO64L $@ + cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check) +quiet_cmd_vdso64as = VDSO64A $@ + cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $< + +OBJECT_FILES_NON_STANDARD := y |