commit 19f2acc915a0f8f443a959844540a6f09133cc96
author Richard Henderson <richard.henderson@linaro.org> Thu Aug 16 14:05:27 2018 +0100
committer Peter Maydell <peter.maydell@linaro.org> Thu Aug 16 14:05:27 2018 +0100
tree a8188298065d9cfe82e90867b8d97d98c3b780af
parent 573ec0fe40b9a412085ac7dfb41975a0fc2b28dd

target/arm: Fix sign-extension in sve do_ldr/do_str

The expression (int) imm + (uint32_t) len_align turns into uint32_t
and thus with negative imm produces a memory operation at the wrong
offset.  None of the numbers involved are particularly large, so
change everything to use int.

Cc: qemu-stable@nongnu.org (3.0.1)
Reported-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target/arm/translate-sve.c

diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 89efc80..9e63b5f 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -4372,12 +4372,11 @@
  * The load should begin at the address Rn + IMM.
  */
 
-static void do_ldr(DisasContext *s, uint32_t vofs, uint32_t len,
-                   int rn, int imm)
+static void do_ldr(DisasContext *s, uint32_t vofs, int len, int rn, int imm)
 {
-    uint32_t len_align = QEMU_ALIGN_DOWN(len, 8);
-    uint32_t len_remain = len % 8;
-    uint32_t nparts = len / 8 + ctpop8(len_remain);
+    int len_align = QEMU_ALIGN_DOWN(len, 8);
+    int len_remain = len % 8;
+    int nparts = len / 8 + ctpop8(len_remain);
     int midx = get_mem_index(s);
     TCGv_i64 addr, t0, t1;
 
@@ -4458,12 +4457,11 @@
 }
 
 /* Similarly for stores.  */
-static void do_str(DisasContext *s, uint32_t vofs, uint32_t len,
-                   int rn, int imm)
+static void do_str(DisasContext *s, uint32_t vofs, int len, int rn, int imm)
 {
-    uint32_t len_align = QEMU_ALIGN_DOWN(len, 8);
-    uint32_t len_remain = len % 8;
-    uint32_t nparts = len / 8 + ctpop8(len_remain);
+    int len_align = QEMU_ALIGN_DOWN(len, 8);
+    int len_remain = len % 8;
+    int nparts = len / 8 + ctpop8(len_remain);
     int midx = get_mem_index(s);
     TCGv_i64 addr, t0;