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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3821ae3128bsm4815080f8f.102.2024.11.15.09.25.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Nov 2024 09:25:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1731691517; x=1732296317; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=7Y0AMU/ttgRURqOnN0XPhkHG3hk3G+OF7iF0mZeXnJQ=; b=n8STFGwn/3EbTsIFfPrxlCpGz3g2Cab4bihNWvoGpv2uklYj6TLxsPptNw+iAnAyBc VgDVrSfv1oA/T1TgSnUR46yjqJ57jQaERu4+QkHroQen07PhgmsSBDQ0daBbqEy7JaPv ecGjZotU4cs3k7OIatfDNOm4esgSeguzRpFTUPpldtmlyJUiagk7EoGfb8pHRzeJ3Ci8 3pTFHtrB/XJbgK3H40xJzLYI1CnkVPty3qVvJ35ed74Zzj2L0YQWU6QNdMzTCsYFdvWB BOAujlDl/b4epOtOzobvb3KFFJNCibiyLx6SVfxvZjdbCHUbPeXkUUKdDyul1t9yqCh8 ANWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731691517; x=1732296317; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=7Y0AMU/ttgRURqOnN0XPhkHG3hk3G+OF7iF0mZeXnJQ=; b=VLlil8B0m1/1nylhpZItTqj/12nEzNAF5orTmOr3jgdZe+QDUKtDrlq7CupHffo5lb ppNOFr4OBJIOQ3RiNSuuKkFs1tNPuI32rcrWAwqYfXuiSGod8G5M1Q0KpFlKuafJgs2H UZdSG/lrHy05e+Z2mLSwunr1sArh9ZXGO71dCTOQZhvsc8K2IzwD/dPIM8hirAur1/I4 e71QIDSxCcRa+nQBdSVJrCL0mfy+W30XspjRqpuE0ionk1pl3rmmVfLdKkB9JXqH2gTJ FQ7dPTcLqjupHXzbHV27jNGbdnipUbyd6ipajs+v8+B941XhmA1uwsAjhvEN7YCNnuTm K5/A== X-Forwarded-Encrypted: i=1; AJvYcCV78VMakTVoSqg2LtgjqLmNi6jiKrNGKPxOCnw0kd9i4L8YNQZcr78wy0GR6CEoofP48oTqxyFETm//@nongnu.org X-Gm-Message-State: AOJu0Yxlg32PSAPs7rZozN9nZKb+K25Q/X4hrK9zOAg04KcsxMtgoQUt 1Bl85/D9hdVIIHTqsMMYp16t+FKroKt5jFzvDEQT7ovMl9m121+FV6CNP7m93cQ= X-Google-Smtp-Source: AGHT+IH9HnPAv5KKrsgFmQTe4yqyqyb78yONAyEmtd66mmIKkV71Oe6N98HEpriHgLuG1vBAsfbhlg== X-Received: by 2002:a05:6000:1884:b0:37d:9476:45f6 with SMTP id ffacd0b85a97d-38225901ed5mr2721510f8f.7.1731691516759; Fri, 15 Nov 2024 09:25:16 -0800 (PST) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Cc: Richard Henderson Subject: [PATCH] tcg: Allow top bit of SIMD_DATA_BITS to be set in simd_desc() Date: Fri, 15 Nov 2024 17:25:15 +0000 Message-Id: <20241115172515.1229393-1-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::42e; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x42e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1731691546333116600 Content-Type: text/plain; charset="utf-8" In simd_desc() we create a SIMD descriptor from various pieces including an arbitrary data value from the caller. We try to sanitize these to make sure everything will fit: the 'data' value needs to fit in the SIMD_DATA_BITS (=3D=3D 22) sized field. However we do that sanitizing with: tcg_debug_assert(data =3D=3D sextract32(data, 0, SIMD_DATA_BITS)); This works for the case where the data is supposed to be considered as a signed integer (which can then be returned via simd_data()). However, some callers want to treat the data value as unsigned. Specifically, for the Arm SVE operations, make_svemte_desc() assembles a data value as a collection of fields, and it needs to use all 22 bits. Currently if MTE is enabled then its MTEDESC SIZEM1 field may have the most significant bit set, and then it will trip this assertion. Loosen the assertion so that we only check that the data value will fit into the field in some way, either as a signed or as an unsigned value. This means we will fail to detect some kinds of bug in the callers, but we won't spuriously assert for intentional use of the data field as unsigned. Cc: qemu-stable@nongnu.org Fixes: db432672dc50e ("tcg: Add generic vector expanders") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2601 Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- tcg/tcg-op-gvec.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/tcg/tcg-op-gvec.c b/tcg/tcg-op-gvec.c index 78ee1ced80f..97e4df221a4 100644 --- a/tcg/tcg-op-gvec.c +++ b/tcg/tcg-op-gvec.c @@ -88,7 +88,20 @@ uint32_t simd_desc(uint32_t oprsz, uint32_t maxsz, int32= _t data) uint32_t desc =3D 0; =20 check_size_align(oprsz, maxsz, 0); - tcg_debug_assert(data =3D=3D sextract32(data, 0, SIMD_DATA_BITS)); + + /* + * We want to check that 'data' will fit into SIMD_DATA_BITS. + * However, some callers want to treat the data as a signed + * value (which they can later get back with simd_data()) + * and some want to treat it as an unsigned value. + * So here we assert only that the data will fit into the + * field in at least one way. This means that some invalid + * values from the caller will not be detected, e.g. if the + * caller wants to handle the value as a signed integer but + * incorrectly passes us 1 << (SIMD_DATA_BITS - 1). + */ + tcg_debug_assert(data =3D=3D sextract32(data, 0, SIMD_DATA_BITS) || + data =3D=3D extract32(data, 0, SIMD_DATA_BITS)); =20 oprsz =3D (oprsz / 8) - 1; maxsz =3D (maxsz / 8) - 1; --=20 2.34.1