[PATCH v4][makedumpfile 1/7] Reserve sections for makedumpfile and extenions

[Tao Liu]

This patch makes preparation for btf/kallsyms support of
makedumpfile and extensions. Any needed kernel symbols/types
will be reserved within a special section, .init_ksyms for
kallsyms symbols and .init_ktypes for kernel types. During
makedumpfile kallsyms/btf initialization, those missing info
will be resolved. A makedumpfile.ld script is introduced for the
purpose.

Suggested-by: Stephen Brennan <stephen.s.brennan at oracle.com>
Signed-off-by: Tao Liu <ltao at redhat.com>
---
 Makefile        |  2 +-
 makedumpfile.ld | 15 +++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 makedumpfile.ld

diff --git a/Makefile b/Makefile
index 05ab5f2..15a4ba0 100644
--- a/Makefile
+++ b/Makefile
@@ -113,7 +113,7 @@ $(OBJ_ARCH): $(SRC_ARCH)
 	$(CC) $(CFLAGS_ARCH) -c -o ./$@ $(VPATH)$(@:.o=.c)
 
 makedumpfile: $(SRC_BASE) $(OBJ_PART) $(OBJ_ARCH)
-	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ_PART) $(OBJ_ARCH) -rdynamic -o $@ $< $(LIBS)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ_PART) $(OBJ_ARCH) -rdynamic -Wl,-T,makedumpfile.ld -o $@ $< $(LIBS)
 	@sed -e "s/@DATE@/$(DATE)/" \
 	     -e "s/@VERSION@/$(VERSION)/" \
 	     $(VPATH)makedumpfile.8.in > $(VPATH)makedumpfile.8
diff --git a/makedumpfile.ld b/makedumpfile.ld
new file mode 100644
index 0000000..231a162
--- /dev/null
+++ b/makedumpfile.ld
@@ -0,0 +1,15 @@
+SECTIONS
+{
+	.init_ksyms ALIGN(8) : {
+		__start_init_ksyms = .;
+		KEEP(*(.init_ksyms*))
+		__stop_init_ksyms = .;
+	}
+
+	.init_ktypes ALIGN(8) : {
+		__start_init_ktypes = .;
+		KEEP(*(.init_ktypes*))
+		__stop_init_ktypes = .;
+	}
+}
+INSERT AFTER .data;
\ No newline at end of file
-- 
2.47.0