commit 33979526cad412b72afd1989a22dcd218b2ce170
author Richard Henderson <richard.henderson@linaro.org> Mon Aug 23 12:55:21 2021 -0700
committer Alistair Francis <alistair.francis@wdc.com> Wed Sep 01 11:59:12 2021 +1000
tree 6a806a15bc58da0f051ed0e65ad4ccb42e4ad447
parent 6ecf39e2dd854ff7ea21c365165c1957061263bb

target/riscv: Fix rmw_sip, rmw_vsip, rmw_hsip vs write-only operation

We distinguish write-only by passing ret_value as NULL.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20210823195529.560295-17-richard.henderson@linaro.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/csr.c

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 6d7f2c2..16bd859 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -937,9 +937,12 @@
     /* Shift the S bits to their VS bit location in mip */
     int ret = rmw_mip(env, 0, ret_value, new_value << 1,
                       (write_mask << 1) & vsip_writable_mask & env->hideleg);
-    *ret_value &= VS_MODE_INTERRUPTS;
-    /* Shift the VS bits to their S bit location in vsip */
-    *ret_value >>= 1;
+
+    if (ret_value) {
+        *ret_value &= VS_MODE_INTERRUPTS;
+        /* Shift the VS bits to their S bit location in vsip */
+        *ret_value >>= 1;
+    }
     return ret;
 }
 
@@ -956,7 +959,9 @@
                       write_mask & env->mideleg & sip_writable_mask);
     }
 
-    *ret_value &= env->mideleg;
+    if (ret_value) {
+        *ret_value &= env->mideleg;
+    }
     return ret;
 }
 
@@ -1072,8 +1077,9 @@
     int ret = rmw_mip(env, 0, ret_value, new_value,
                       write_mask & hvip_writable_mask);
 
-    *ret_value &= hvip_writable_mask;
-
+    if (ret_value) {
+        *ret_value &= hvip_writable_mask;
+    }
     return ret;
 }
 
@@ -1084,8 +1090,9 @@
     int ret = rmw_mip(env, 0, ret_value, new_value,
                       write_mask & hip_writable_mask);
 
-    *ret_value &= hip_writable_mask;
-
+    if (ret_value) {
+        *ret_value &= hip_writable_mask;
+    }
     return ret;
 }