arm64: vdso: Annotate for BTI

Generate BTI annotations for all assembly files included in the 64 bit
vDSO.
Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200506195138.22086-10-broonie@kernel.orgSigned-off-by: Will Deacon <will@kernel.org>

arch/arm64/kernel/vdso/note.S

@@ -12,9 +12,12 @@
 #include <linux/version.h>
 #include <linux/elfnote.h>
 #include <linux/build-salt.h>
+#include <asm/assembler.h>
 
 ELFNOTE_START(Linux, 0, "a")
 	.long LINUX_VERSION_CODE
 ELFNOTE_END
 
 BUILD_SALT
+
+emit_aarch64_feature_1_and

arch/arm64/kernel/vdso/sigreturn.S

@@ -9,6 +9,7 @@
  */
 
 #include <linux/linkage.h>
+#include <asm/assembler.h>
 #include <asm/unistd.h>
 
 	.text
@@ -24,3 +25,5 @@ SYM_FUNC_START(__kernel_rt_sigreturn)
 	svc	#0
 	.cfi_endproc
 SYM_FUNC_END(__kernel_rt_sigreturn)
+
+emit_aarch64_feature_1_and

arch/arm64/kernel/vdso/vdso.S

@@ -8,6 +8,7 @@
 #include <linux/init.h>
 #include <linux/linkage.h>
 #include <linux/const.h>
+#include <asm/assembler.h>
 #include <asm/page.h>
 
 	.globl vdso_start, vdso_end
@@ -19,3 +20,5 @@ vdso_start:
 vdso_end:
 
 	.previous
+
+emit_aarch64_feature_1_and