fdt: move dumpdtb interpretation code to device_tree.c

The dumpdtb code can be useful in more places than just for e500. Move it
to a generic place.

Signed-off-by: Alexander Graf <agraf@suse.de>

device_tree.c

@@ -304,3 +304,25 @@ int qemu_devtree_add_subnode(void *fdt, const char *name)
     g_free(dupname);
     return retval;
 }
+
+void qemu_devtree_dumpdtb(void *fdt, int size)
+{
+    QemuOpts *machine_opts;
+
+    machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
+    if (machine_opts) {
+        const char *dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");
+        if (dumpdtb) {
+            /* Dump the dtb to a file and quit */
+            FILE *f = fopen(dumpdtb, "wb");
+            size_t len;
+            len = fwrite(fdt, size, 1, f);
+            fclose(f);
+            if (len != size) {
+                exit(1);
+            }
+            exit(0);
+        }
+    }
+
+}

device_tree.h

@@ -49,4 +49,6 @@ int qemu_devtree_add_subnode(void *fdt, const char *name);
                              sizeof(qdt_tmp));                                \
     } while (0)
 
+void qemu_devtree_dumpdtb(void *fdt, int size);
+
 #endif /* __DEVICE_TREE_H__ */

hw/ppc/e500.c

@@ -139,12 +139,10 @@ static int ppce500_load_device_tree(CPUPPCState *env,
             0x0, 0x10000,
         };
     QemuOpts *machine_opts;
-    const char *dumpdtb = NULL;
     const char *dtb_file = NULL;
 
     machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
     if (machine_opts) {
-        dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");
         dtb_file = qemu_opt_get(machine_opts, "dtb");
         toplevel_compat = qemu_opt_get(machine_opts, "dt_compatible");
     }
@@ -334,18 +332,7 @@ static int ppce500_load_device_tree(CPUPPCState *env,
     }
 
 done:
-    if (dumpdtb) {
+    qemu_devtree_dumpdtb(fdt, fdt_size);
-        /* Dump the dtb to a file and quit */
-        FILE *f = fopen(dumpdtb, "wb");
-        size_t len;
-        len = fwrite(fdt, fdt_size, 1, f);
-        fclose(f);
-        if (len != fdt_size) {
-            exit(1);
-        }
-        exit(0);
-    }
-
     ret = rom_add_blob_fixed(BINARY_DEVICE_TREE_FILE, fdt, fdt_size, addr);
     if (ret < 0) {
         goto out;