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target/arm: Fix vd == vm overlap in sve_ldff1_z 

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 a6771f2f5c)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Richard Henderson 2023-05-18 10:31:43 +01:00 committed by Michael Tokarev
parent 7405624def
commit d68a13c672
1 changed files with 6 additions and 0 deletions
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6
target/arm/sve_helper.c
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@ -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.
*/