| # 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 $(srctree)/lib/vdso/Makefile |
| |
| obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o |
| obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o |
| |
| obj-vdso32 += getrandom-32.o vgetrandom-chacha-32.o |
| obj-vdso64 += getrandom-64.o vgetrandom-chacha-64.o |
| |
| ifneq ($(c-gettimeofday-y),) |
| CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y) |
| # 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 += -include $(c-gettimeofday-y) $(call cc-option, -ffixed-r30) |
| endif |
| |
| ifneq ($(c-getrandom-y),) |
| CFLAGS_vgetrandom-32.o += -include $(c-getrandom-y) |
| CFLAGS_vgetrandom-64.o += -include $(c-getrandom-y) |
| endif |
| |
| # Build rules |
| |
| ifdef CROSS32_COMPILE |
| VDSOCC := $(CROSS32_COMPILE)gcc |
| else |
| VDSOCC := $(CC) |
| endif |
| |
| targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o vgetrandom-32.o |
| targets += crtsavres-32.o |
| obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32)) |
| targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o vgetrandom-64.o |
| obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64)) |
| |
| ccflags-y := -fno-common -fno-builtin -DBUILD_VDSO |
| ccflags-y += $(DISABLE_LATENT_ENTROPY_PLUGIN) |
| ccflags-y += $(call cc-option, -fno-stack-protector) |
| ccflags-y += -DDISABLE_BRANCH_PROFILING |
| ccflags-y += -ffreestanding -fasynchronous-unwind-tables |
| ccflags-remove-y := $(CC_FLAGS_FTRACE) |
| 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 |
| CC32FLAGSREMOVE := -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 |
| CC32FLAGSREMOVE += -fno-stack-clash-protection |
| endif |
| 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 |
| |
| # link rule for the .so file, .lds has to be first |
| $(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o $(obj)/vgetrandom-32.o $(obj)/crtsavres-32.o FORCE |
| $(call if_changed,vdso32ld_and_check) |
| $(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o $(obj)/vgetrandom-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)/crtsavres-32.o: %-32.o: $(srctree)/arch/powerpc/lib/crtsavres.S FORCE |
| $(call if_changed_dep,vdso32as) |
| $(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE |
| $(call if_changed_dep,vdso32cc) |
| $(obj)/vgetrandom-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) |
| $(obj)/vgetrandom-64.o: %-64.o: %.c FORCE |
| $(call if_changed_dep,cc_o_c) |
| |
| # Generate VDSO offsets using helper script |
| gen-vdso32sym := $(src)/gen_vdso32_offsets.sh |
| quiet_cmd_vdso32sym = VDSO32SYM $@ |
| cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@ |
| gen-vdso64sym := $(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) $(filter-out $(CC32FLAGSREMOVE), $(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 $@ $< |
