[PATCH] target/riscv: fix invalid sstc predicate in gdbstub

[Abhigyan Kumar <314abh@gmail.com>]

sstc function incorrectly checks for avaibility of env->rdtime_fn.
This causes it to fail each time it's called because rdtime_fn is setup
later in the procedure (when timer devices are created). This prevents
stimecmp's addition to gdb.

This change ensures only the riscv_cpu_cfg(env) check is done. rdtime_fn
will always be NULL otherwise and fail.

Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3496
Signed-off-by: Abhigyan Kumar <314abh@gmail.com>
---
 target/riscv/csr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index f5b0895fd..d72df945f 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -590,7 +590,7 @@ static RISCVException sstc(CPURISCVState *env, int csrno)
 {
     bool hmode_check = false;
 
-    if (!riscv_cpu_cfg(env)->ext_sstc || !env->rdtime_fn) {
+    if (!riscv_cpu_cfg(env)->ext_sstc) {
         return RISCV_EXCP_ILLEGAL_INST;
     }
 
-- 
2.54.0