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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id d2sm13446951pjs.21.2019.08.19.14.38.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 19 Aug 2019 14:38:34 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Mon, 19 Aug 2019 14:37:17 -0700 Message-Id: <20190819213755.26175-31-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190819213755.26175-1-richard.henderson@linaro.org> References: <20190819213755.26175-1-richard.henderson@linaro.org> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2607:f8b0:4864:20::544 Subject: [Qemu-devel] [PATCH v2 30/68] target/arm: Diagnose base == pc for LDM/STM X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" We have been using store_reg and not store_reg_for_load when writing back a loaded value into the base register. At first glance this is incorrect when base == pc, however that case is UNPREDICTABLE. Signed-off-by: Richard Henderson --- target/arm/translate.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/arm/translate.c b/target/arm/translate.c index 1792bb7abd..09636aab4e 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9752,6 +9752,10 @@ static bool op_stm(DisasContext *s, arg_ldst_block *a, int min_n) if (n < min_n) { return false; } + /* Using PC as the base register is UNPREDICTABLE. */ + if (a->rn == 15) { + return false; + } addr = op_addr_block_pre(s, a, n); mem_idx = get_mem_index(s); @@ -9828,6 +9832,10 @@ static bool do_ldm(DisasContext *s, arg_ldst_block *a, int min_n) if (n < min_n) { return false; } + /* Using PC as the base register is UNPREDICTABLE. */ + if (a->rn == 15) { + return false; + } addr = op_addr_block_pre(s, a, n); mem_idx = get_mem_index(s); @@ -9864,6 +9872,7 @@ static bool do_ldm(DisasContext *s, arg_ldst_block *a, int min_n) op_addr_block_post(s, a, addr, n); if (loaded_base) { + /* Note that we reject base == pc above. */ store_reg(s, a->rn, loaded_var); } -- 2.17.1