From nobody Tue Feb 10 04:15:39 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1693818517544620.930618646256; Mon, 4 Sep 2023 02:08:37 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qd5Yz-00048J-Fr; Mon, 04 Sep 2023 05:08:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qd5Ys-0003se-Pc; Mon, 04 Sep 2023 05:07:58 -0400 Received: from gandalf.ozlabs.org ([150.107.74.76]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qd5Yo-0003ui-LH; Mon, 04 Sep 2023 05:07:58 -0400 Received: from gandalf.ozlabs.org (mail.ozlabs.org [IPv6:2404:9400:2221:ea00::3]) by gandalf.ozlabs.org (Postfix) with ESMTP id 4RfN880Q4rz4wxW; Mon, 4 Sep 2023 19:07:52 +1000 (AEST) Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4RfN843YYYz4wy9; Mon, 4 Sep 2023 19:07:48 +1000 (AEST) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-ppc@nongnu.org, qemu-devel@nongnu.org Cc: Daniel Henrique Barboza , Nicholas Piggin , qemu-stable@nongnu.org, Ivan Warren , Richard Henderson , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PULL 28/35] target/ppc: Fix LQ, STQ register-pair order for big-endian Date: Mon, 4 Sep 2023 11:06:23 +0200 Message-ID: <20230904090630.725952-29-clg@kaod.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230904090630.725952-1-clg@kaod.org> References: <20230904090630.725952-1-clg@kaod.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=150.107.74.76; envelope-from=SRS0=kZzc=EU=kaod.org=clg@ozlabs.org; helo=gandalf.ozlabs.org X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no 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-ZM-MESSAGEID: 1693818519868100003 From: Nicholas Piggin LQ, STQ have the same register-pair ordering as LQARX/STQARX., which is the even (lower) register contains the most significant bits. This is not implemented correctly for big-endian. do_ldst_quad() has variables low_addr_gpr and high_addr_gpr which is confusing because they are low and high addresses, whereas LQARX/STQARX. and most such things use the low and high values for lo/hi variables. The conversion to native 128-bit memory access functions missed this strangeness. Fix this by changing the if condition, and change the variable names to hi/lo to match convention. Cc: qemu-stable@nongnu.org Reported-by: Ivan Warren Fixes: 57b38ffd0c6f ("target/ppc: Use tcg_gen_qemu_{ld,st}_i128 for LQARX, = LQ, STQ") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1836 Signed-off-by: Nicholas Piggin Reviewed-by: Richard Henderson Signed-off-by: C=C3=A9dric Le Goater --- target/ppc/translate/fixedpoint-impl.c.inc | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/target/ppc/translate/fixedpoint-impl.c.inc b/target/ppc/transl= ate/fixedpoint-impl.c.inc index 4ce02fd3a479..7ff7e1ec46a9 100644 --- a/target/ppc/translate/fixedpoint-impl.c.inc +++ b/target/ppc/translate/fixedpoint-impl.c.inc @@ -71,7 +71,7 @@ static bool do_ldst_quad(DisasContext *ctx, arg_D *a, boo= l store, bool prefixed) { #if defined(TARGET_PPC64) TCGv ea; - TCGv_i64 low_addr_gpr, high_addr_gpr; + TCGv_i64 lo, hi; TCGv_i128 t16; =20 REQUIRE_INSNS_FLAGS(ctx, 64BX); @@ -94,21 +94,21 @@ static bool do_ldst_quad(DisasContext *ctx, arg_D *a, b= ool store, bool prefixed) gen_set_access_type(ctx, ACCESS_INT); ea =3D do_ea_calc(ctx, a->ra, tcg_constant_tl(a->si)); =20 - if (prefixed || !ctx->le_mode) { - low_addr_gpr =3D cpu_gpr[a->rt]; - high_addr_gpr =3D cpu_gpr[a->rt + 1]; + if (ctx->le_mode && prefixed) { + lo =3D cpu_gpr[a->rt]; + hi =3D cpu_gpr[a->rt + 1]; } else { - low_addr_gpr =3D cpu_gpr[a->rt + 1]; - high_addr_gpr =3D cpu_gpr[a->rt]; + lo =3D cpu_gpr[a->rt + 1]; + hi =3D cpu_gpr[a->rt]; } t16 =3D tcg_temp_new_i128(); =20 if (store) { - tcg_gen_concat_i64_i128(t16, low_addr_gpr, high_addr_gpr); + tcg_gen_concat_i64_i128(t16, lo, hi); tcg_gen_qemu_st_i128(t16, ea, ctx->mem_idx, DEF_MEMOP(MO_128)); } else { tcg_gen_qemu_ld_i128(t16, ea, ctx->mem_idx, DEF_MEMOP(MO_128)); - tcg_gen_extr_i128_i64(low_addr_gpr, high_addr_gpr, t16); + tcg_gen_extr_i128_i64(lo, hi, t16); } #else qemu_build_not_reached(); --=20 2.41.0