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[97.113.7.119]) by smtp.gmail.com with ESMTPSA id f6sm18999174pga.50.2019.09.04.12.31.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Sep 2019 12:31:40 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Date: Wed, 4 Sep 2019 12:30:21 -0700 Message-Id: <20190904193059.26202-32-richard.henderson@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190904193059.26202-1-richard.henderson@linaro.org> References: <20190904193059.26202-1-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::543 Subject: [Qemu-devel] [PATCH v4 31/69] 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+patch=linaro.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. Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- target/arm/translate.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) -- 2.17.1 diff --git a/target/arm/translate.c b/target/arm/translate.c index b623dbcd48..d0fc916ff9 100644 --- a/target/arm/translate.c +++ b/target/arm/translate.c @@ -9863,7 +9863,7 @@ static bool op_stm(DisasContext *s, arg_ldst_block *a, int min_n) list = a->list; n = ctpop16(list); - if (n < min_n) { + if (n < min_n || a->rn == 15) { unallocated_encoding(s); return true; } @@ -9943,7 +9943,7 @@ static bool do_ldm(DisasContext *s, arg_ldst_block *a, int min_n) list = a->list; n = ctpop16(list); - if (n < min_n) { + if (n < min_n || a->rn == 15) { unallocated_encoding(s); return true; } @@ -9983,6 +9983,7 @@ 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); }