ANDROID: compile / link / clean protected-exports.o

This commit adds the generation of protected exports to Kbuild.

Bug: 393366754
Change-Id: Ib684e2424638614d38ed6b1390f451781935f37a
Signed-off-by: Sid Nayyar <sidnayyar@google.com>

Makefile

@@ -1548,7 +1548,8 @@ CLEAN_FILES += vmlinux.symvers modules-only.symvers \
 	       modules.builtin modules.builtin.modinfo modules.nsdeps \
 	       modules.builtin.ranges vmlinux.o.map \
 	       compile_commands.json rust/test \
-	       rust-project.json .vmlinux.objs .vmlinux.export.c
+	       rust-project.json .vmlinux.objs .vmlinux.export.c \
+	       .vmlinux.protected-exports.c
 
 # Directories & files removed with 'make mrproper'
 MRPROPER_FILES += include/config include/generated          \

scripts/Makefile.vmlinux

@@ -20,6 +20,12 @@ quiet_cmd_cc_o_c = CC      $@
 ifdef CONFIG_MODULES
 targets += .vmlinux.export.o
 vmlinux: .vmlinux.export.o
+
+ifdef CONFIG_MODULE_SIG_PROTECT
+targets += .vmlinux.protected-exports.o
+vmlinux: .vmlinux.protected-exports.o
+endif
+
 endif
 
 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

scripts/link-vmlinux.sh

@@ -70,6 +70,9 @@ vmlinux_link()
 
 	if is_enabled CONFIG_MODULES; then
 		objs="${objs} .vmlinux.export.o"
+		if is_enabled CONFIG_MODULE_SIG_PROTECT; then
+			objs="${objs} .vmlinux.protected-exports.o"
+		fi
 	fi
 
 	objs="${objs} init/version-timestamp.o"