From the earliest PowerPC ISA, TBR (later SPR) 268 has been called TB
and accessed with mftb instruction. The problem is that TB is the name
of the 64-bit register, and 32-bit implementations can only read the
lower half with one instruction, so 268 has also been called TBL and
it does only read TBL on 32-bit.

Change SPR 268 to be called TB on 64-bit implementations.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/helper_regs.c  | 4 ++++
 target/ppc/ppc-qmp-cmds.c | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/target/ppc/helper_regs.c b/target/ppc/helper_regs.c
index f380342d4d..8c00ed8c06 100644
--- a/target/ppc/helper_regs.c
+++ b/target/ppc/helper_regs.c
@@ -460,7 +460,11 @@ void register_generic_sprs(PowerPCCPU *cpu)
     }
 
     /* Time base */
+#if defined(TARGET_PPC64)
+    spr_register(env, SPR_VTBL,  "TB",
+#else
     spr_register(env, SPR_VTBL,  "TBL",
+#endif
                  &spr_read_tbl, SPR_NOACCESS,
                  &spr_read_tbl, SPR_NOACCESS,
                  0x00000000);
diff --git a/target/ppc/ppc-qmp-cmds.c b/target/ppc/ppc-qmp-cmds.c
index f9acc21056..ffaff59e78 100644
--- a/target/ppc/ppc-qmp-cmds.c
+++ b/target/ppc/ppc-qmp-cmds.c
@@ -103,7 +103,11 @@ const MonitorDef monitor_defs[] = {
     { "xer", 0, &monitor_get_xer },
     { "msr", offsetof(CPUPPCState, msr) },
     { "tbu", 0, &monitor_get_tbu, },
+#if defined(TARGET_PPC64)
+    { "tb", 0, &monitor_get_tbl, },
+#else
     { "tbl", 0, &monitor_get_tbl, },
+#endif
     { NULL },
 };
 
-- 
2.42.0