mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-05-26 11:40:24 +02:00
Thomas Weißschuh
127b0e05c1
As the Makefile is included into other Makefiles it can not be used to define objects to be built from the current source directory. However the generic datastore will introduce such a local source file. Rename the included Makefile so it is clear how it is to be used and to make room for a regular Makefile in lib/vdso/. Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-4-13a4669dfc8c@linutronix.de
124 lines
5.2 KiB
Makefile
124 lines
5.2 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# List of files in the vdso, has to be asm only for now
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# Include the generic Makefile to check the built vdso.
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include $(srctree)/lib/vdso/Makefile.include
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obj-vdso32 = sigtramp32-32.o gettimeofday-32.o datapage-32.o cacheflush-32.o note-32.o getcpu-32.o
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obj-vdso64 = sigtramp64-64.o gettimeofday-64.o datapage-64.o cacheflush-64.o note-64.o getcpu-64.o
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obj-vdso32 += getrandom-32.o vgetrandom-chacha-32.o
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obj-vdso64 += getrandom-64.o vgetrandom-chacha-64.o
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ifneq ($(c-gettimeofday-y),)
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CFLAGS_vgettimeofday-32.o += -include $(c-gettimeofday-y)
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# Go prior to 1.16.x assumes r30 is not clobbered by any VDSO code. That used to be true
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# by accident when the VDSO was hand-written asm code, but may not be now that the VDSO is
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# compiler generated. To avoid breaking Go tell GCC not to use r30. Impact on code
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# generation is minimal, it will just use r29 instead.
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CFLAGS_vgettimeofday-64.o += -include $(c-gettimeofday-y) $(call cc-option, -ffixed-r30)
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endif
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ifneq ($(c-getrandom-y),)
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CFLAGS_vgetrandom-32.o += -include $(c-getrandom-y)
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CFLAGS_vgetrandom-64.o += -include $(c-getrandom-y)
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endif
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# Build rules
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ifdef CROSS32_COMPILE
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VDSOCC := $(CROSS32_COMPILE)gcc
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else
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VDSOCC := $(CC)
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endif
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targets := $(obj-vdso32) vdso32.so.dbg vgettimeofday-32.o vgetrandom-32.o
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targets += crtsavres-32.o
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obj-vdso32 := $(addprefix $(obj)/, $(obj-vdso32))
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targets += $(obj-vdso64) vdso64.so.dbg vgettimeofday-64.o vgetrandom-64.o
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obj-vdso64 := $(addprefix $(obj)/, $(obj-vdso64))
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ccflags-y := -fno-common -fno-builtin -DBUILD_VDSO
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ccflags-y += $(DISABLE_LATENT_ENTROPY_PLUGIN)
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ccflags-y += $(call cc-option, -fno-stack-protector)
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ccflags-y += -DDISABLE_BRANCH_PROFILING
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ccflags-y += -ffreestanding -fasynchronous-unwind-tables
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ccflags-remove-y := $(CC_FLAGS_FTRACE)
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ldflags-y := -Wl,--hash-style=both -nostdlib -shared -z noexecstack $(CLANG_FLAGS)
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ldflags-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld)
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ldflags-$(CONFIG_LD_ORPHAN_WARN) += -Wl,--orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
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# Filter flags that clang will warn are unused for linking
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ldflags-y += $(filter-out $(CC_AUTO_VAR_INIT_ZERO_ENABLER) $(CC_FLAGS_FTRACE) -Wa$(comma)%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
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CC32FLAGS := -m32
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CC32FLAGSREMOVE := -mcmodel=medium -mabi=elfv1 -mabi=elfv2 -mcall-aixdesc
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ifdef CONFIG_CC_IS_CLANG
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# This flag is supported by clang for 64-bit but not 32-bit so it will cause
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# an unused command line flag warning for this file.
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CC32FLAGSREMOVE += -fno-stack-clash-protection
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# -mstack-protector-guard values from the 64-bit build are not valid for the
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# 32-bit one. clang validates the values passed to these arguments during
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# parsing, even when -fno-stack-protector is passed afterwards.
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CC32FLAGSREMOVE += -mstack-protector-guard%
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endif
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LD32FLAGS := -Wl,-soname=linux-vdso32.so.1
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AS32FLAGS := -D__VDSO32__
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LD64FLAGS := -Wl,-soname=linux-vdso64.so.1
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AS64FLAGS := -D__VDSO64__
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targets += vdso32.lds
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CPPFLAGS_vdso32.lds += -P -C -Upowerpc
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targets += vdso64.lds
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CPPFLAGS_vdso64.lds += -P -C
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# link rule for the .so file, .lds has to be first
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$(obj)/vdso32.so.dbg: $(obj)/vdso32.lds $(obj-vdso32) $(obj)/vgettimeofday-32.o $(obj)/vgetrandom-32.o $(obj)/crtsavres-32.o FORCE
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$(call if_changed,vdso32ld_and_check)
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$(obj)/vdso64.so.dbg: $(obj)/vdso64.lds $(obj-vdso64) $(obj)/vgettimeofday-64.o $(obj)/vgetrandom-64.o FORCE
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$(call if_changed,vdso64ld_and_check)
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# assembly rules for the .S files
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$(obj-vdso32): %-32.o: %.S FORCE
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$(call if_changed_dep,vdso32as)
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$(obj)/crtsavres-32.o: %-32.o: $(srctree)/arch/powerpc/lib/crtsavres.S FORCE
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$(call if_changed_dep,vdso32as)
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$(obj)/vgettimeofday-32.o: %-32.o: %.c FORCE
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$(call if_changed_dep,vdso32cc)
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$(obj)/vgetrandom-32.o: %-32.o: %.c FORCE
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$(call if_changed_dep,vdso32cc)
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$(obj-vdso64): %-64.o: %.S FORCE
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$(call if_changed_dep,vdso64as)
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$(obj)/vgettimeofday-64.o: %-64.o: %.c FORCE
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$(call if_changed_dep,cc_o_c)
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$(obj)/vgetrandom-64.o: %-64.o: %.c FORCE
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$(call if_changed_dep,cc_o_c)
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# Generate VDSO offsets using helper script
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gen-vdso32sym := $(src)/gen_vdso32_offsets.sh
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quiet_cmd_vdso32sym = VDSO32SYM $@
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cmd_vdso32sym = $(NM) $< | $(gen-vdso32sym) | LC_ALL=C sort > $@
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gen-vdso64sym := $(src)/gen_vdso64_offsets.sh
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quiet_cmd_vdso64sym = VDSO64SYM $@
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cmd_vdso64sym = $(NM) $< | $(gen-vdso64sym) | LC_ALL=C sort > $@
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include/generated/vdso32-offsets.h: $(obj)/vdso32.so.dbg FORCE
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$(call if_changed,vdso32sym)
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include/generated/vdso64-offsets.h: $(obj)/vdso64.so.dbg FORCE
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$(call if_changed,vdso64sym)
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# actual build commands
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quiet_cmd_vdso32ld_and_check = VDSO32L $@
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cmd_vdso32ld_and_check = $(VDSOCC) $(ldflags-y) $(CC32FLAGS) $(LD32FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
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quiet_cmd_vdso32as = VDSO32A $@
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cmd_vdso32as = $(VDSOCC) $(a_flags) $(CC32FLAGS) $(AS32FLAGS) -c -o $@ $<
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quiet_cmd_vdso32cc = VDSO32C $@
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cmd_vdso32cc = $(VDSOCC) $(filter-out $(CC32FLAGSREMOVE), $(c_flags)) $(CC32FLAGS) -c -o $@ $<
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quiet_cmd_vdso64ld_and_check = VDSO64L $@
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cmd_vdso64ld_and_check = $(VDSOCC) $(ldflags-y) $(LD64FLAGS) -o $@ -Wl,-T$(filter %.lds,$^) $(filter %.o,$^); $(cmd_vdso_check)
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quiet_cmd_vdso64as = VDSO64A $@
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cmd_vdso64as = $(VDSOCC) $(a_flags) $(AS64FLAGS) -c -o $@ $<
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