diff mbox series

[Stable-7.2.3,39/45] target/arm: Fix vd == vm overlap in sve_ldff1_z

Message ID 20230523102014.85954-8-mjt@tls.msk.ru
State New
Headers show
Series None | expand

Commit Message

Michael Tokarev May 23, 2023, 10:17 a.m. UTC 
From: Richard Henderson <richard.henderson@linaro.org>

If vd == vm, copy vm to scratch, so that we can pre-zero
the output and still access the gather indicies.

Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1612
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20230504104232.1877774-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit a6771f2f5cbfbf312e2fb5b1627f38a6bf6321d0)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/target/arm/sve_helper.c b/target/arm/sve_helper.c
index 521fc9b969..27838fb6e2 100644
--- a/target/arm/sve_helper.c
+++ b/target/arm/sve_helper.c
@@ -6726,6 +6726,7 @@  void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
     intptr_t reg_off;
     SVEHostPage info;
     target_ulong addr, in_page;
+    ARMVectorReg scratch;
 
     /* Skip to the first true predicate.  */
     reg_off = find_next_active(vg, 0, reg_max, esz);
@@ -6735,6 +6736,11 @@  void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
         return;
     }
 
+    /* Protect against overlap between vd and vm. */
+    if (unlikely(vd == vm)) {
+        vm = memcpy(&scratch, vm, reg_max);
+    }
+
     /*
      * Probe the first element, allowing faults.
      */