dt: Add -machine dumpdtb option to dump the current dtb

Now that we are dynamically creating the dtb, it's really useful to
be able to dump the created blob for debugging.

This patch implements a -machine dumpdtb=<file> option for e500 that
dumps the dtb exactly in the form the guest would get it to disk. It
can then be analyzed by dtc to get information about the guest
configuration.

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

1 files changed, 18 insertions, 0 deletions

diff --git a/hw/ppce500_mpc8544ds.c b/hw/ppce500_mpc8544ds.c
index 880ed55fdb..7c6edc22e1 100644
--- a/hw/ppce500_mpc8544ds.c
+++ b/hw/ppce500_mpc8544ds.c
@@ -111,6 +111,8 @@ static int mpc8544_load_device_tree(CPUPPCState *env,
     uint32_t pci_ranges[12] = { 0x2000000, 0x0, 0xc0000000, 0xc0000000, 0x0,
                                 0x20000000, 0x1000000, 0x0, 0x0, 0xe1000000,
                                 0x0, 0x10000 };
+    QemuOpts *machine_opts;
+    const char *dumpdtb = NULL;
 
     fdt = create_device_tree(&fdt_size);
     if (fdt == NULL) {
@@ -300,6 +302,22 @@ static int mpc8544_load_device_tree(CPUPPCState *env,
     qemu_devtree_setprop_cell(fdt, pci, "#address-cells", 3);
     qemu_devtree_setprop_string(fdt, "/aliases", "pci0", pci);
 
+    machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
+    if (machine_opts) {
+        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, 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;