42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Richard Henderson <richard.henderson@linaro.org>
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Date: Thu, 4 May 2023 11:42:32 +0100
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Subject: [PATCH] target/arm: Fix vd == vm overlap in sve_ldff1_z
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If vd == vm, copy vm to scratch, so that we can pre-zero
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the output and still access the gather indicies.
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Cc: qemu-stable@nongnu.org
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Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1612
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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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(picked up from https://lists.nongnu.org/archive/html/qemu-devel/2023-05/msg00961.html)
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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---
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target/arm/tcg/sve_helper.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/target/arm/tcg/sve_helper.c b/target/arm/tcg/sve_helper.c
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index ccf5e5beca..0097522470 100644
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--- a/target/arm/tcg/sve_helper.c
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+++ b/target/arm/tcg/sve_helper.c
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@@ -6727,6 +6727,7 @@ void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
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intptr_t reg_off;
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SVEHostPage info;
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target_ulong addr, in_page;
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+ ARMVectorReg scratch;
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/* Skip to the first true predicate. */
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reg_off = find_next_active(vg, 0, reg_max, esz);
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@@ -6736,6 +6737,11 @@ void sve_ldff1_z(CPUARMState *env, void *vd, uint64_t *vg, void *vm,
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return;
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}
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+ /* Protect against overlap between vd and vm. */
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+ if (unlikely(vd == vm)) {
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+ vm = memcpy(&scratch, vm, reg_max);
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+ }
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+
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/*
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* Probe the first element, allowing faults.
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*/
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