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83 lines
2.6 KiB
83 lines
2.6 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Building a vDSO image for AArch64. |
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# |
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# Author: Will Deacon <[email protected]> |
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# Heavily based on the vDSO Makefiles for other archs. |
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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_AARCH64_JUMP_SLOT|R_AARCH64_GLOB_DAT|R_AARCH64_ABS64 |
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include $(srctree)/lib/vdso/Makefile |
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obj-vdso := vgettimeofday.o note.o sigreturn.o |
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# Build rules |
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targets := $(obj-vdso) vdso.so vdso.so.dbg |
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
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btildflags-$(CONFIG_ARM64_BTI_KERNEL) += -z force-bti |
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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 --build-id=sha1 -n $(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 -DBUILD_VDSO |
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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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KCOV_INSTRUMENT := n |
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CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -fasynchronous-unwind-tables |
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ifneq ($(c-gettimeofday-y),) |
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CFLAGS_vgettimeofday.o += -include $(c-gettimeofday-y) |
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endif |
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# Disable gcov profiling for VDSO code |
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GCOV_PROFILE := n |
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targets += vdso.lds |
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CPPFLAGS_vdso.lds += -P -C -U$(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: $(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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$(obj)/%.so: OBJCOPYFLAGS := -S |
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$(obj)/%.so: $(obj)/%.so.dbg FORCE |
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$(call if_changed,objcopy) |
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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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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_vdsold_and_vdso_check = LD $@ |
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cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check) |
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# Install commands for the unstripped file |
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quiet_cmd_vdso_install = INSTALL $@ |
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cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ |
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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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