From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37397) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZKC6-0007aP-1N for qemu-devel@nongnu.org; Fri, 26 Feb 2016 10:20:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aZKC0-0004mQ-Pb for qemu-devel@nongnu.org; Fri, 26 Feb 2016 10:20:37 -0500 Received: from orth.archaic.org.uk ([2001:8b0:1d0::2]:55997) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aZKC0-0004lb-JR for qemu-devel@nongnu.org; Fri, 26 Feb 2016 10:20:32 -0500 Received: from pm215 by orth.archaic.org.uk with local (Exim 4.84) (envelope-from ) id 1aZKC0-0003Mj-C3 for qemu-devel@nongnu.org; Fri, 26 Feb 2016 15:20:32 +0000 From: Peter Maydell Date: Fri, 26 Feb 2016 15:20:14 +0000 Message-Id: <1456500025-28761-10-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1456500025-28761-1-git-send-email-peter.maydell@linaro.org> References: <1456500025-28761-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PULL 09/20] target-arm: In v8, make illegal AArch32 mode changes set PSTATE.IL List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org In v8, the illegal mode changes which are UNPREDICTABLE in v7 are given architected behaviour: * the mode field is unchanged * PSTATE.IL is set (so any subsequent instructions will UNDEF) * any other CPSR fields are written to as normal This is pretty much the same behaviour we picked for our UNPREDICTABLE handling, with the exception that for v8 we need to set the IL bit. Signed-off-by: Peter Maydell Reviewed-by: Sergey Fedorov Message-id: 1455556977-3644-10-git-send-email-peter.maydell@linaro.org --- target-arm/helper.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/target-arm/helper.c b/target-arm/helper.c index 5926b15..ff5f895 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -5325,11 +5325,20 @@ void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask, (env->uncached_cpsr & CPSR_M) != CPSR_USER && ((env->uncached_cpsr ^ val) & mask & CPSR_M)) { if (bad_mode_switch(env, val & CPSR_M)) { - /* Attempt to switch to an invalid mode: this is UNPREDICTABLE. - * We choose to ignore the attempt and leave the CPSR M field - * untouched. + /* Attempt to switch to an invalid mode: this is UNPREDICTABLE in + * v7, and has defined behaviour in v8: + * + leave CPSR.M untouched + * + allow changes to the other CPSR fields + * + set PSTATE.IL + * For user changes via the GDB stub, we don't set PSTATE.IL, + * as this would be unnecessarily harsh for a user error. */ mask &= ~CPSR_M; + if (write_type != CPSRWriteByGDBStub && + arm_feature(env, ARM_FEATURE_V8)) { + mask |= CPSR_IL; + val |= CPSR_IL; + } } else { switch_mode(env, val & CPSR_M); } -- 1.9.1