target-arm: A64: Avoid signed shifts in disas_ldst_pair()

Avoid shifting potentially negative signed offset values in
disas_ldst_pair() by keeping the offset in a uint64_t rather
than an int64_t.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1423233250-15853-5-git-send-email-peter.maydell@linaro.org

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index 68c5b239141f614c073bc2635b89b34aa3ea1111..9f54501a9ec744e4466506b688ea0b761a6370c2 100644 (file)
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1917,7 +1917,7 @@ static void disas_ldst_pair(DisasContext *s, uint32_t insn)
     int rt = extract32(insn, 0, 5);
     int rn = extract32(insn, 5, 5);
     int rt2 = extract32(insn, 10, 5);
-    int64_t offset = sextract32(insn, 15, 7);
+    uint64_t offset = sextract64(insn, 15, 7);
     int index = extract32(insn, 23, 2);
     bool is_vector = extract32(insn, 26, 1);
     bool is_load = extract32(insn, 22, 1);