System register access with MRRS/MSRR use a different
exception class.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/syndrome.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/target/arm/syndrome.h b/target/arm/syndrome.h
index bff61f052c..2c7dc53507 100644
--- a/target/arm/syndrome.h
+++ b/target/arm/syndrome.h
@@ -45,6 +45,7 @@ enum arm_exception_class {
     EC_AA32_SVC               = 0x11,
     EC_AA32_HVC               = 0x12,
     EC_AA32_SMC               = 0x13,
+    EC_SYSTEMREGISTER128TRAP  = 0x14,
     EC_AA64_SVC               = 0x15,
     EC_AA64_HVC               = 0x16,
     EC_AA64_SMC               = 0x17,
@@ -187,6 +188,15 @@ static inline uint32_t syn_aa64_sysregtrap(int op0, int op1, int op2,
         | (crm << 1) | isread;
 }
 
+static inline uint32_t syn_aa64_sysreg128trap(int op0, int op1, int op2,
+                                              int crn, int crm, int rt,
+                                              int isread)
+{
+    return (EC_SYSTEMREGISTER128TRAP << ARM_EL_EC_SHIFT) | ARM_EL_IL
+        | (op0 << 20) | (op2 << 17) | (op1 << 14) | (crn << 10) | (rt << 5)
+        | (crm << 1) | isread;
+}
+
 static inline uint32_t syn_cp14_rt_trap(int cv, int cond, int opc1, int opc2,
                                         int crn, int crm, int rt, int isread,
                                         bool is_16bit)
-- 
2.43.0

On Tue, 14 Oct 2025 at 21:15, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> System register access with MRRS/MSRR use a different
> exception class.
>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---


Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM