From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47598) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRjcy-0002SD-5J for qemu-devel@nongnu.org; Fri, 05 Feb 2016 11:53:01 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRjcx-00076b-1p for qemu-devel@nongnu.org; Fri, 05 Feb 2016 11:53:00 -0500 From: Peter Maydell Date: Fri, 5 Feb 2016 16:45:04 +0000 Message-Id: <1454690704-16233-7-git-send-email-peter.maydell@linaro.org> In-Reply-To: <1454690704-16233-1-git-send-email-peter.maydell@linaro.org> References: <1454690704-16233-1-git-send-email-peter.maydell@linaro.org> Subject: [Qemu-devel] [PATCH 6/6] target-arm: Report correct syndrome for FPEXC32_EL2 traps List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: "Edgar E. Iglesias" , qemu-arm@nongnu.org, patches@linaro.org If access to FPEXC32_EL2 is trapped by CPTR_EL2.TFP or CPTR_EL3.TFP, this should be reported with a syndrome register indicating an FP access trap, not one indicating a system register access trap. Signed-off-by: Peter Maydell --- target-arm/cpu.h | 5 +++++ target-arm/helper.c | 4 ++-- target-arm/op_helper.c | 13 +++++++++++++ 3 files changed, 20 insertions(+), 2 deletions(-) diff --git a/target-arm/cpu.h b/target-arm/cpu.h index d1d6886..a959ad6 100644 --- a/target-arm/cpu.h +++ b/target-arm/cpu.h @@ -1322,6 +1322,11 @@ typedef enum CPAccessResult { /* As CP_ACCESS_UNCATEGORIZED, but for traps directly to EL2 or EL3 */ CP_ACCESS_TRAP_UNCATEGORIZED_EL2 = 5, CP_ACCESS_TRAP_UNCATEGORIZED_EL3 = 6, + /* Access fails and results in an exception syndrome for an FP access, + * trapped directly to EL2 or EL3 + */ + CP_ACCESS_TRAP_FP_EL2 = 7, + CP_ACCESS_TRAP_FP_EL3 = 8, } CPAccessResult; /* Access functions for coprocessor registers. These cannot fail and diff --git a/target-arm/helper.c b/target-arm/helper.c index 064b415..163a72a 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -3012,10 +3012,10 @@ static CPAccessResult fpexc32_access(CPUARMState *env, const ARMCPRegInfo *ri, bool isread) { if ((env->cp15.cptr_el[2] & CPTR_TFP) && arm_current_el(env) == 2) { - return CP_ACCESS_TRAP_EL2; + return CP_ACCESS_TRAP_FP_EL2; } if (env->cp15.cptr_el[3] & CPTR_TFP) { - return CP_ACCESS_TRAP_EL3; + return CP_ACCESS_TRAP_FP_EL3; } return CP_ACCESS_OK; } diff --git a/target-arm/op_helper.c b/target-arm/op_helper.c index 4fedae5..754f080 100644 --- a/target-arm/op_helper.c +++ b/target-arm/op_helper.c @@ -500,6 +500,19 @@ void HELPER(access_check_cp_reg)(CPUARMState *env, void *rip, uint32_t syndrome, target_el = 3; syndrome = syn_uncategorized(); break; + case CP_ACCESS_TRAP_FP_EL2: + target_el = 2; + /* Since we are an implementation that takes exceptions on a trapped + * conditional insn only if the insn has passed its condition code + * check, we take the IMPDEF choice to always report CV=1 COND=0xe + * (which is also the required value for AArch64 traps). + */ + syndrome = syn_fp_access_trap(1, 0xe, false); + break; + case CP_ACCESS_TRAP_FP_EL3: + target_el = 3; + syndrome = syn_fp_access_trap(1, 0xe, false); + break; default: g_assert_not_reached(); } -- 1.9.1