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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/arch/arm64/kernel/vdso/Makefile
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@@ -17,17 +17,21 @@
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 targets := $(obj-vdso) vdso.so vdso.so.dbg
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 obj-vdso := $(addprefix $(obj)/, $(obj-vdso))
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-ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \
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-		--build-id -n -T
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-ccflags-y += $(DISABLE_LTO)
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+btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti
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+
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+# -Bsymbolic has been added for consistency with arm, the compat vDSO and
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+# potential future proofing if we end up with internal calls to the exported
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+# routines, as x86 does (see 6f121e548f83 ("x86, vdso: Reimplement vdso.so
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+# preparation in build-time C")).
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+ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv	\
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+	     -Bsymbolic $(call ld-option, --no-eh-frame-hdr) --build-id=sha1 -n	\
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+	     $(btildflags-y) -T
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 ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18
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-ccflags-y += -DDISABLE_BRANCH_PROFILING
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+ccflags-y += -DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
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-VDSO_LDFLAGS := -Bsymbolic
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-
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-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS)
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-KBUILD_CFLAGS			+= $(DISABLE_LTO)
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+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \
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+				$(CC_FLAGS_LTO)
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 KASAN_SANITIZE			:= n
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 UBSAN_SANITIZE			:= n
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 OBJECT_FILES_NON_STANDARD	:= y
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@@ -39,25 +43,18 @@
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   CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y)
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 endif
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-# Clang versions less than 8 do not support -mcmodel=tiny
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-ifeq ($(CONFIG_CC_IS_CLANG), y)
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-  ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0)
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-    CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny
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-  endif
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-endif
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-
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 # Disable gcov profiling for VDSO code
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 GCOV_PROFILE := n
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 obj-y += vdso.o
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-extra-y += vdso.lds
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+targets += vdso.lds
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 CPPFLAGS_vdso.lds += -P -C -U$(ARCH)
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 # Force dependency (incbin is bad)
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 $(obj)/vdso.o : $(obj)/vdso.so
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 # Link rule for the .so file, .lds has to be first
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-$(obj)/vdso.so.dbg: $(src)/vdso.lds $(obj-vdso)
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+$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
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 	$(call if_changed,vdsold_and_vdso_check)
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 # Strip rule for the .so file
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@@ -68,17 +65,12 @@
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 # Generate VDSO offsets using helper script
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 gen-vdsosym := $(srctree)/$(src)/gen_vdso_offsets.sh
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 quiet_cmd_vdsosym = VDSOSYM $@
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-define cmd_vdsosym
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-	$(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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-endef
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+      cmd_vdsosym = $(NM) $< | $(gen-vdsosym) | LC_ALL=C sort > $@
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 include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
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 	$(call if_changed,vdsosym)
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 # Actual build commands
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-quiet_cmd_vdsoas = VDSOA   $@
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-      cmd_vdsoas = $(CC) $(a_flags) -c -o $@ $<
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-
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 quiet_cmd_vdsold_and_vdso_check = LD      $@
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       cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check)
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