38 lines
1.3 KiB
Makefile
38 lines
1.3 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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obj-y += vsyscall.o vsyscall-syscall.o vsyscall-syms.o
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$(obj)/vsyscall-syscall.o: \
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$(foreach F,trapa,$(obj)/vsyscall-$F.so)
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# Teach kbuild about targets
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targets += $(foreach F,trapa,vsyscall-$F.o vsyscall-$F.so)
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targets += vsyscall-note.o vsyscall.lds vsyscall-dummy.o
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# The DSO images are built using a special linker script
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quiet_cmd_syscall = SYSCALL $@
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cmd_syscall = $(CC) -nostdlib $(SYSCFLAGS_$(@F)) \
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-Wl,-T,$(filter-out FORCE,$^) -o $@
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export CPPFLAGS_vsyscall.lds += -P -C -Ush
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vsyscall-flags = -shared -s -Wl,-soname=linux-gate.so.1 \
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$(call cc-ldoption, -Wl$(comma)--hash-style=sysv)
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SYSCFLAGS_vsyscall-trapa.so = $(vsyscall-flags)
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$(obj)/vsyscall-trapa.so: \
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$(obj)/vsyscall-%.so: $(src)/vsyscall.lds $(obj)/vsyscall-%.o FORCE
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$(call if_changed,syscall)
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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 -R we can then refer to
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# these symbols in the kernel code rather than hand-coded addresses.
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SYSCFLAGS_vsyscall-dummy.o = -r
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$(obj)/vsyscall-dummy.o: $(src)/vsyscall.lds \
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$(obj)/vsyscall-trapa.o $(obj)/vsyscall-note.o FORCE
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$(call if_changed,syscall)
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LDFLAGS_vsyscall-syms.o := -r -R
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$(obj)/vsyscall-syms.o: $(obj)/vsyscall-dummy.o FORCE
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$(call if_changed,ld)
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