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78 lines
2.0 KiB
78 lines
2.0 KiB
# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Building vDSO images for x86. |
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# |
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# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in. |
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KCOV_INSTRUMENT := n |
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VDSO64-y := y |
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vdso-install-$(VDSO64-y) += vdso.so |
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# files to link into the vdso |
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vobjs-y := vdso-note.o um_vdso.o |
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# files to link into kernel |
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obj-$(VDSO64-y) += vdso.o vma.o |
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vobjs := $(foreach F,$(vobjs-y),$(obj)/$F) |
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$(obj)/vdso.o: $(obj)/vdso.so |
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targets += vdso.so vdso.so.dbg vdso.lds $(vobjs-y) |
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CPPFLAGS_vdso.lds += -P -C |
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VDSO_LDFLAGS_vdso.lds = -m64 -Wl,-soname=linux-vdso.so.1 \ |
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-Wl,-z,max-page-size=4096 |
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$(obj)/vdso.o: $(src)/vdso.S $(obj)/vdso.so |
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$(obj)/vdso.so.dbg: $(obj)/vdso.lds $(vobjs) FORCE |
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$(call if_changed,vdso) |
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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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# |
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# Don't omit frame pointers for ease of userspace debugging, but do |
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# optimize sibling calls. |
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# |
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CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \ |
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$(filter -g%,$(KBUILD_CFLAGS)) -fno-stack-protector \ |
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-fno-omit-frame-pointer -foptimize-sibling-calls |
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$(vobjs): KBUILD_CFLAGS += $(CFL) |
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# |
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# vDSO code runs in userspace and -pg doesn't help with profiling anyway. |
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# |
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CFLAGS_REMOVE_vdso-note.o = -pg -fprofile-arcs -ftest-coverage |
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CFLAGS_REMOVE_um_vdso.o = -pg -fprofile-arcs -ftest-coverage |
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# |
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# The DSO images are built using a special linker script. |
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# |
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quiet_cmd_vdso = VDSO $@ |
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cmd_vdso = $(CC) -nostdlib -o $@ \ |
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$(VDSO_LDFLAGS) $(VDSO_LDFLAGS_$(filter %.lds,$(^F))) \ |
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-Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ |
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sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' |
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VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv |
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GCOV_PROFILE := n |
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# |
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# Install the unstripped copy of vdso*.so listed in $(vdso-install-y). |
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# |
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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-install-y): %.so: $(obj)/%.so.dbg FORCE |
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@mkdir -p $(MODLIB)/vdso |
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$(call cmd,vdso_install) |
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PHONY += vdso_install $(vdso-install-y) |
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vdso_install: $(vdso-install-y)
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