debian/patches/extra/0011-target-arm-Fix-vd-vm-overlap-in-sve_ldff1_z.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Richard Henderson <richard.henderson@linaro.org>
   3 Date: Thu, 4 May 2023 11:42:32 +0100
   4 Subject: [PATCH] target/arm: Fix vd == vm overlap in sve_ldff1_z
   5
   6 If vd == vm, copy vm to scratch, so that we can pre-zero
   7 the output and still access the gather indicies.
   8
   9 Cc: qemu-stable@nongnu.org
  10 Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1612
  11 Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
  12 (picked up from https://lists.nongnu.org/archive/html/qemu-devel/2023-05/msg00961.html)
  13 Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
  14 ---
  15  target/arm/tcg/sve_helper.c | 6 ++++++
  16  1 file changed, 6 insertions(+)
  17
  18 diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c
  19 index ccf5e5beca..0097522470 100644
  20 --- a/target/arm/tcg/sve_helper.c
  21 +++ b/target/arm/tcg/sve_helper.c
  22 @@ -6727,6 +6727,7 @@ void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
  23      intptr_t reg_off;
  24      SVEHostPage info;
  25      target_ulong addr, in_page;
  26 +    ARMVectorReg scratch;
  27
  28      /* Skip to the first true predicate.  */
  29      reg_off = find_next_active(vg, 0, reg_max, esz);
  30 @@ -6736,6 +6737,11 @@ void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
  31          return;
  32      }
  33
  34 +    /* Protect against overlap between vd and vm. */
  35 +    if (unlikely(vd == vm)) {
  36 +        vm = memcpy(&scratch, vm, reg_max);
  37 +    }
  38 +
  39      /*
  40       * Probe the first element, allowing faults.
  41       */