[PATCH] target/alpha: fix icount handling for timer instructions

From: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
To: qemu-devel@nongnu.org
Cc: richard.henderson@linaro.org, pavel.dovgalyuk@ispras.ru
Subject: [PATCH] target/alpha: fix icount handling for timer instructions
Date: Thu, 05 Nov 2020 12:04:06 +0300	[thread overview]
Message-ID: <160456704692.16573.15665952713514406897.stgit@pasha-ThinkPad-X280> (raw)

This patch handles icount mode for timer read/write instructions,
because it is required to call gen_io_start in such cases.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru>
---
 target/alpha/translate.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/alpha/translate.c b/target/alpha/translate.c
index 36be602179..b534b0579d 100644
--- a/target/alpha/translate.c
+++ b/target/alpha/translate.c
@@ -1330,7 +1330,7 @@ static DisasJumpType gen_mfpr(DisasContext *ctx, TCGv va, int regno)
     case 249: /* VMTIME */
         helper = gen_helper_get_vmtime;
     do_helper:
-        if (icount_enabled()) {
+        if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
             gen_io_start();
             helper(va);
             return DISAS_PC_STALE;
@@ -1366,6 +1366,7 @@ static DisasJumpType gen_mfpr(DisasContext *ctx, TCGv va, int regno)
 static DisasJumpType gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
 {
     int data;
+    DisasJumpType ret = DISAS_NEXT;
 
     switch (regno) {
     case 255:
@@ -1395,6 +1396,10 @@ static DisasJumpType gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
 
     case 251:
         /* ALARM */
+        if (tb_cflags(ctx->base.tb) & CF_USE_ICOUNT) {
+            gen_io_start();
+            ret = DISAS_PC_STALE;
+        }
         gen_helper_set_alarm(cpu_env, vb);
         break;
 
@@ -1434,7 +1439,7 @@ static DisasJumpType gen_mtpr(DisasContext *ctx, TCGv vb, int regno)
         break;
     }
 
-    return DISAS_NEXT;
+    return ret;
 }
 #endif /* !USER_ONLY*/
 


