testdata: loader - declare constant in custom .rodata.test section

This exercises support for constants in custom .rodata* sections.

Signed-off-by: Timo Beckers <timo@isovalent.com>

elf_reader_test.go

@@ -154,13 +154,10 @@ func TestLoadCollectionSpec(t *testing.T) {
 		cmpopts.IgnoreFields(MapSpec{}, "Key", "Value"),
 		cmpopts.IgnoreUnexported(ProgramSpec{}),
 		cmpopts.IgnoreMapEntries(func(key string, _ *MapSpec) bool {
-			switch key {
-			case ".bss", ".data", ".rodata":
+			if key == ".bss" || key == ".data" || strings.HasPrefix(key, ".rodata") {
 				return true
-
-			default:
-				return false
 			}
+			return false
 		}),
 	}
 
@@ -177,9 +174,10 @@ func TestLoadCollectionSpec(t *testing.T) {
 		}
 
 		opts := defaultOpts
-		if have.Maps[".rodata"] != nil {
+		if have.Types != nil {
 			err := have.RewriteConstants(map[string]interface{}{
-				"arg": uint32(1),
+				"arg":  uint32(1),
+				"arg2": uint32(2),
 			})
 			if err != nil {
 				t.Fatal("Can't rewrite constant:", err)
@@ -223,7 +221,7 @@ func TestLoadCollectionSpec(t *testing.T) {
 			t.Fatal("Can't run program:", err)
 		}
 
-		if ret != 5 {
+		if ret != 7 {
 			t.Error("Expected return value to be 5, got", ret)
 		}
 	})

testdata/loader.c

@@ -112,7 +112,9 @@ int __attribute__((noinline)) global_fn(uint32_t arg) {
 static volatile unsigned int key1 = 0; // .bss
 static volatile unsigned int key2 = 1; // .data
 volatile const unsigned int key3  = 2; // .rodata
-static volatile const uint32_t arg;    // .rodata, rewritten by loader
+static volatile const uint32_t arg;    // .rodata, populated by loader
+// custom .rodata section, populated by loader
+static volatile const uint32_t arg2 __section(".rodata.test");
 #endif
 
 __section("xdp") int xdp_prog() {
@@ -121,11 +123,12 @@ __section("xdp") int xdp_prog() {
 	unsigned int key2 = 1;
 	unsigned int key3 = 2;
 	uint32_t arg      = 1;
+	uint32_t arg2     = 2;
 #endif
 	map_lookup_elem(&hash_map, (void *)&key1);
 	map_lookup_elem(&hash_map2, (void *)&key2);
 	map_lookup_elem(&hash_map2, (void *)&key3);
-	return static_fn(arg) + global_fn(arg);
+	return static_fn(arg) + global_fn(arg) + arg2;
 }
 
 // This function has no relocations, and is thus parsed differently.