19f9a34f87
This implements initial support for the vsyscall page on SH. At the moment we leave it configurable due to having nommu to support from the same code base. We hook it up for the signal trampoline return at present, with more to be added later, once uClibc catches up. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
36 lines
1.2 KiB
Makefile
36 lines
1.2 KiB
Makefile
obj-y += vsyscall.o vsyscall-syscall.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
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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 ld-option, -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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extra-y += vsyscall-syms.o
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$(obj)/built-in.o: $(obj)/vsyscall-syms.o
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$(obj)/built-in.o: ld_flags += -R $(obj)/vsyscall-syms.o
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SYSCFLAGS_vsyscall-syms.o = -r
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$(obj)/vsyscall-syms.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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