[06/97] target/arm: Fix sign-extension in sve do_ldr/do_str

Message ID 20190401210011.16009-7-mdroth@linux.vnet.ibm.com
State New
Headers show
Series
  • [01/97] target/arm: Fix sign of sve_cmpeq_ppzw/sve_cmpne_ppzw
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Commit Message

Michael Roth April 1, 2019, 8:58 p.m.
From: Richard Henderson <richard.henderson@linaro.org>


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>

(cherry picked from commit 19f2acc915a0f8f443a959844540a6f09133cc96)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

---
 target/arm/translate-sve.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

-- 
2.17.1

Patch

diff --git a/target/arm/translate-sve.c b/target/arm/translate-sve.c
index 89efc80ee7..9e63b5f8e5 100644
--- a/target/arm/translate-sve.c
+++ b/target/arm/translate-sve.c
@@ -4372,12 +4372,11 @@  static bool trans_UCVTF_dd(DisasContext *s, arg_rpr_esz *a, uint32_t insn)
  * 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 @@  static void do_ldr(DisasContext *s, uint32_t vofs, uint32_t len,
 }
 
 /* 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;