diff options
| -rw-r--r-- | arch/x86/vdso/Makefile | 14 | ||||
| -rw-r--r-- | arch/x86/vdso/vdso.lds.S | 10 |
2 files changed, 24 insertions, 0 deletions
diff --git a/arch/x86/vdso/Makefile b/arch/x86/vdso/Makefile index e7bff0fbac23..d8200adae9fa 100644 --- a/arch/x86/vdso/Makefile +++ b/arch/x86/vdso/Makefile @@ -55,6 +55,20 @@ SYSCFLAGS_vdso-syms.o = -r -d $(obj)/vdso-syms.o: $(src)/vdso.lds $(vobjs) FORCE $(call if_changed,syscall) +targets += vdso-syms.lds +obj-y += vdso-syms.lds + +# +# Match symbols in the DSO that look like VDSO*; produce a file of constants. +# +sed-vdsosym := -e 's/^00*/0/' \ + -e 's/^\([0-9a-fA-F]*\) . \(VDSO[a-zA-Z0-9_]*\)$$/\2 = 0x\1;/p' +quiet_cmd_vdsosym = VDSOSYM $@ + cmd_vdsosym = $(NM) $< | sed -n $(sed-vdsosym) | LC_ALL=C sort > $@ + +$(obj)/%-syms.lds: $(obj)/%.so.dbg FORCE + $(call if_changed,vdsosym) + quiet_cmd_vdso_install = INSTALL $@ cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@ vdso.so: diff --git a/arch/x86/vdso/vdso.lds.S b/arch/x86/vdso/vdso.lds.S index 667d3245d972..d40d0e906190 100644 --- a/arch/x86/vdso/vdso.lds.S +++ b/arch/x86/vdso/vdso.lds.S @@ -8,6 +8,16 @@ #define VDSO_PRELINK 0xffffffffff700000 +/* + * Symbols we define here called VDSO* get their values into vdso-syms.lds + * and become visible to the kernel itself. + */ +VDSO64_PRELINK = VDSO_PRELINK; + +#define VEXTERN(x) VDSO64_ ## x = vdso_ ## x; +#include "vextern.h" +#undef VEXTERN + SECTIONS { . = VDSO_PRELINK + SIZEOF_HEADERS; |