This allows reading and writing of SPRs via GDB:

(gdb) p/x $srr1
$1 = 0x8000000002803033

(gdb) p/x $pvr
$2 = 0x4b0201
(gdb) set $pvr=0x4b0000
(gdb) p/x $pvr
$3 = 0x4b0000

They can also be shown as a group:
(gdb) info reg spr

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
---
 target/ppc/translate_init.inc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/ppc/translate_init.inc.c b/target/ppc/translate_init.inc.c
index bbb468f38d..ebf202e54d 100644
--- a/target/ppc/translate_init.inc.c
+++ b/target/ppc/translate_init.inc.c
@@ -9761,7 +9761,10 @@ static void ppc_cpu_realize(DeviceState *dev, Error **errp)
         gdb_register_coprocessor(cs, gdb_get_vsx_reg, gdb_set_vsx_reg,
                                  32, "power-vsx.xml", 0);
     }
-
+#ifndef CONFIG_USER_ONLY
+    gdb_register_coprocessor(cs, gdb_get_spr_reg, gdb_set_spr_reg,
+                             ppc_gdb_gen_spr_xml(cs), "power-spr.xml", 0);
+#endif
     qemu_init_vcpu(cs);
 
     pcc->parent_realize(dev, errp);
@@ -10524,7 +10527,9 @@ static void ppc_cpu_class_init(ObjectClass *oc, void *data)
 #endif
 
     cc->gdb_num_core_regs = 71;
-
+#ifndef CONFIG_USER_ONLY
+    cc->gdb_get_dynamic_xml = ppc_gdb_get_dynamic_xml;
+#endif
 #ifdef USE_APPLE_GDB
     cc->gdb_read_register = ppc_cpu_gdb_read_register_apple;
     cc->gdb_write_register = ppc_cpu_gdb_write_register_apple;
-- 
2.17.1