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81 lines
2.6 KiB
81 lines
2.6 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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# Copied from arch/tile/kernel/vdso/Makefile |
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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_RISCV_32|R_RISCV_64|R_RISCV_JUMP_SLOT |
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include $(srctree)/lib/vdso/Makefile |
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# Symbols present in the vdso |
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vdso-syms = rt_sigreturn |
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ifdef CONFIG_64BIT |
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vdso-syms += vgettimeofday |
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endif |
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vdso-syms += getcpu |
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vdso-syms += flush_icache |
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# Files to link into the vdso |
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obj-vdso = $(patsubst %, %.o, $(vdso-syms)) note.o |
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ccflags-y := -fno-stack-protector |
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ifneq ($(c-gettimeofday-y),) |
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CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y) |
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endif |
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# Build rules |
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targets := $(obj-vdso) vdso.so vdso.so.dbg vdso.lds vdso-dummy.o |
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obj-vdso := $(addprefix $(obj)/, $(obj-vdso)) |
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obj-y += vdso.o vdso-syms.o |
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CPPFLAGS_vdso.lds += -P -C -U$(ARCH) |
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# Disable -pg to prevent insert call site |
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CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os |
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# Disable profiling and instrumentation for VDSO code |
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GCOV_PROFILE := n |
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KCOV_INSTRUMENT := n |
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KASAN_SANITIZE := n |
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# Force dependency |
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$(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 $(obj-vdso) FORCE |
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$(call if_changed,vdsold) |
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LDFLAGS_vdso.so.dbg = -shared -s -soname=linux-vdso.so.1 \ |
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--build-id=sha1 --hash-style=both --eh-frame-hdr |
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# We also create a special relocatable object that should mirror the symbol |
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# table and layout of the linked DSO. With ld --just-symbols we can then |
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# refer to these symbols in the kernel code rather than hand-coded addresses. |
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$(obj)/vdso-syms.S: $(obj)/vdso.so FORCE |
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$(call if_changed,so2s) |
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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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# actual build commands |
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# The DSO images are built using a special linker script |
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# Make sure only to export the intended __vdso_xxx symbol offsets. |
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quiet_cmd_vdsold = VDSOLD $@ |
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cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \ |
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$(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \ |
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rm $@.tmp |
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# Extracts symbol offsets from the VDSO, converting them into an assembly file |
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# that contains the same symbols at the same offsets. |
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quiet_cmd_so2s = SO2S $@ |
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cmd_so2s = $(NM) -D $< | $(srctree)/$(src)/so2s.sh > $@ |
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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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