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58 lines
2.1 KiB
58 lines
2.1 KiB
9 months ago
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From 300a84c83fc6f112bed7e488f0e64eb6c07d47bf Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Tue, 23 May 2023 12:34:33 +0200
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Subject: [PATCH 05/22] target/s390x: Fix cc_calc_sla_64() missing overflows
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 279: Backport latest s390x-related fixes from upstream QEMU for qemu-kvm in RHEL 8.9
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RH-Bugzilla: 2169308 2209605
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Commit: [4/21] 2f91de2ac980d6ffa4da0ec41bb30562624a2396
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Bugzilla: https://bugzilla.redhat.com/2169308
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commit df103c09bc2f549d36ba6313a69c18fc003ef1ee
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Author: Ilya Leoshkevich <iii@linux.ibm.com>
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Date: Wed Jan 12 17:50:14 2022 +0100
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target/s390x: Fix cc_calc_sla_64() missing overflows
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An overflow occurs for SLAG when at least one shifted bit is not equal
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to sign bit. Therefore, we need to check that `shift + 1` bits are
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neither all 0s nor all 1s. The current code checks only `shift` bits,
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missing some overflows.
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Fixes: cbe24bfa91d2 ("target-s390: Convert SHIFT, ROTATE SINGLE")
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Co-developed-by: David Hildenbrand <david@redhat.com>
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Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
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Reviewed-by: David Hildenbrand <david@redhat.com>
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Message-Id: <20220112165016.226996-4-iii@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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target/s390x/tcg/cc_helper.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/target/s390x/tcg/cc_helper.c b/target/s390x/tcg/cc_helper.c
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index c2c96c3a3c..c9b7b0e8c6 100644
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--- a/target/s390x/tcg/cc_helper.c
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+++ b/target/s390x/tcg/cc_helper.c
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@@ -297,7 +297,7 @@ static uint32_t cc_calc_sla_32(uint32_t src, int shift)
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static uint32_t cc_calc_sla_64(uint64_t src, int shift)
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{
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- uint64_t mask = ((1ULL << shift) - 1ULL) << (64 - shift);
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+ uint64_t mask = -1ULL << (63 - shift);
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uint64_t sign = 1ULL << 63;
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uint64_t match;
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int64_t r;
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--
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2.37.3
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