test(verify): seed the arm64 ABI kernel arguments

Assisted-by: GLM 5.3

verify/abi_arch_test.go

@@ -42,8 +42,12 @@ func TestABIArm64(t *testing.T) {
 		t.Errorf("cleanAdd: %s", report)
 	}
 
-	// dirtyFP clobbers the frame pointer (R29).
+	// dirtyFP clobbers the frame pointer (R29).  The kernel passes its
-	out, report, err = k.CallFuncChecked("dirtyFP", make([]byte, 16))
+	// argument through, so the argument must carry the expected value the
+	// way the amd64 twin test seeds it.
+	args = make([]byte, 16)
+	PutUint64(args, 0, 0x1234)
+	out, report, err = k.CallFuncChecked("dirtyFP", args)
 	if err != nil {
 		t.Fatalf("CallFuncChecked: %v", err)
 	}
@@ -57,11 +61,17 @@ func TestABIArm64(t *testing.T) {
 		t.Errorf("dirtyFP: only R29 should be clobbered: %s", report)
 	}
 
-	// dirtyG clobbers the goroutine pointer (R28).
+	// dirtyG clobbers the goroutine pointer (R28) and still returns its
-	_, report, err = k.CallFuncChecked("dirtyG", make([]byte, 16))
+	// argument.
+	args = make([]byte, 16)
+	PutUint64(args, 0, 0x5678)
+	out, report, err = k.CallFuncChecked("dirtyG", args)
 	if err != nil {
 		t.Fatalf("CallFuncChecked: %v", err)
 	}
+	if got := int64(GetUint64(out, 8)); got != 0x5678 {
+		t.Errorf("dirtyG returned %d, want %d", got, int64(0x5678))
+	}
 	if !report.GClobbered {
 		t.Error("dirtyG: expected g clobbered, but report says clean")
 	}