PA-RISC specification says: "Setting the PSW Q-bit, PSW{28}, to 1 with this instruction, if it was not already 1, is an undefined operation." However, at least HP-UX 10.20 sets the Q bit from 0 to 1 with the SSM instruction. Tested this both on HP9000/712 and HP9000/785/C3750, both machines set the Q bit from 0 to 1 without exception. This makes HP-UX 10.20 progress a little bit further.
Signed-off-by: Sven Schnelle <sv...@stackframe.org> --- target/hppa/op_helper.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/target/hppa/op_helper.c b/target/hppa/op_helper.c index 912e8d5be4..3adcfd8976 100644 --- a/target/hppa/op_helper.c +++ b/target/hppa/op_helper.c @@ -665,11 +665,6 @@ void HELPER(reset)(CPUHPPAState *env) target_ureg HELPER(swap_system_mask)(CPUHPPAState *env, target_ureg nsm) { target_ulong psw = env->psw; - /* ??? On second reading this condition simply seems - to be undefined rather than a diagnosed trap. */ - if (nsm & ~psw & PSW_Q) { - hppa_dynamic_excp(env, EXCP_ILL, GETPC()); - } env->psw = (psw & ~PSW_SM) | (nsm & PSW_SM); return psw & PSW_SM; } -- 2.20.1