[Stable-8.1.3 18/55] target/sparc: Clear may_lookup for npc == DYNAMIC_PC

[Michael Tokarev]

From: Richard Henderson <richard.henderson@linaro.org>

With pairs of jmp+rett, pc == DYNAMIC_PC_LOOKUP and
npc == DYNAMIC_PC.  Make sure that we exit for interrupts.

Cc: qemu-stable@nongnu.org
Fixes: 633c42834c7 ("target/sparc: Introduce DYNAMIC_PC_LOOKUP")
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit 930f1865cc654b637ffe1207fa5b44bf0a156279)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index bd877a5e4a..9074a90818 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -5664,10 +5664,10 @@ static void sparc_tr_tb_stop(DisasContextBase *dcbase, 
CPUState *cs)
             break;
         }
 
+        may_lookup = true;
         if (dc->pc & 3) {
             switch (dc->pc) {
             case DYNAMIC_PC_LOOKUP:
-                may_lookup = true;
                 break;
             case DYNAMIC_PC:
                 may_lookup = false;
@@ -5677,10 +5677,24 @@ static void sparc_tr_tb_stop(DisasContextBase *dcbase, 
CPUState *cs)
             }
         } else {
             tcg_gen_movi_tl(cpu_pc, dc->pc);
-            may_lookup = true;
         }
 
-        save_npc(dc);
+        if (dc->npc & 3) {
+            switch (dc->npc) {
+            case JUMP_PC:
+                gen_generic_branch(dc);
+                break;
+            case DYNAMIC_PC:
+                may_lookup = false;
+                break;
+            case DYNAMIC_PC_LOOKUP:
+                break;
+            default:
+                g_assert_not_reached();
+            }
+        } else {
+            tcg_gen_movi_tl(cpu_npc, dc->npc);
+        }
         if (may_lookup) {
             tcg_gen_lookup_and_goto_ptr();
         } else {
-- 
2.39.2