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36 lines
1.3 KiB
36 lines
1.3 KiB
# 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 -Wl,--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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