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

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/tcg/translate-a64.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c
index 599e7a36ee3..c0fa2137b63 100644
--- a/target/arm/tcg/translate-a64.c
+++ b/target/arm/tcg/translate-a64.c
@@ -2455,6 +2455,19 @@ static void gen_sysreg_undef(DisasContext *s, bool isread,
     gen_exception_insn(s, 0, EXCP_UDEF, syndrome);
 }
 
+/*
+ * Look up @key, returning the cpreg, which must exist.
+ * Additionally, the new cpreg must also be accessible.
+ */
+static const ARMCPRegInfo *
+redirect_cpreg(DisasContext *s, uint32_t key, bool isread)
+{
+    const ARMCPRegInfo *ri = get_arm_cp_reginfo(s->cp_regs, key);
+    assert(ri);
+    assert(cp_access_ok(s->current_el, ri, isread));
+    return ri;
+}
+
 /* MRS - move from system register
  * MSR (register) - move to system register
  * SYS
@@ -2603,9 +2616,7 @@ static void handle_sys(DisasContext *s, bool isread,
          * fine-grained-traps on EL1 also do not apply here.
          */
         key = ENCODE_AA64_CP_REG(op0, 0, crn, crm, op2);
-        ri = get_arm_cp_reginfo(s->cp_regs, key);
-        assert(ri);
-        assert(cp_access_ok(s->current_el, ri, isread));
+        ri = redirect_cpreg(s, key, isread);
         /*
          * We might not have done an update_pc earlier, so check we don't
          * need it. We could support this in future if necessary.
-- 
2.43.0