From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 21145CD8CB2 for ; Tue, 9 Jun 2026 16:39:23 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wWzTA-0002eG-QO; Tue, 09 Jun 2026 12:38:28 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wWzT8-0002cw-7V for qemu-devel@nongnu.org; Tue, 09 Jun 2026 12:38:26 -0400 Received: from sea.source.kernel.org ([172.234.252.31]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wWzT6-0005E5-Pf for qemu-devel@nongnu.org; Tue, 09 Jun 2026 12:38:25 -0400 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 608E142DFD; Tue, 9 Jun 2026 16:38:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75CA91F00893; Tue, 9 Jun 2026 16:38:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1781023102; bh=J1AWjYZU/hD53VPk5IiZ2Jz6nUV+3nPhEWHBfOxyoTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LgU967BqbIFIwvsDfu5073X9NrI2uj1W1+zUXev2FEWP/61e+qIKZfqA6NtdBq/cr KksB1759LxJo/2++7mmX9cfezGtm2Sll2Dh/J+eZnFIBT2dTiHRuLxeulg2qlUzPro fO4zrQt/kc8xkq9dXJonQFjKQF568Cjc8iMFJ3PIQ4zCqQ6wEa23YdwIxuiztF1BRt K/rF7YKC930uCGkWjhpCZjT9f5xtxBDSAKnQpKbAeMxsUNI9fFwKxxXS1p7HgpTPQj dGQdny/FOwJDxdNXKrMqVpKgpbUsLmeaK3Ve9wNcYqwiUOfNEfNRmPmj40qux58piY KyBg6qzkzACfA== From: Helge Deller To: qemu-devel@nongnu.org Cc: deller@gmx.de, Yoshinori Sato , Pierrick Bouvier , Laurent Vivier , Max Filippov , Matt Turner , Mark Cave-Ayland Subject: [PULL v2 5/8] linux-user/sparc: restore L/I registers from RSA in sparc64_set_context Date: Tue, 9 Jun 2026 18:38:04 +0200 Message-ID: <20260609163807.6083-6-deller@kernel.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260609163807.6083-1-deller@kernel.org> References: <20260609163807.6083-1-deller@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=172.234.252.31; envelope-from=deller@kernel.org; helo=sea.source.kernel.org X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Matt Turner The kernel's do_rt_sigreturn loads L and I registers from the register save area (RSA) at the restored O6+STACK_BIAS. QEMU lacks the kernel's window-fill path, so restore L0-L7 and I0-I5 explicitly from the RSA. I6 and I7 are already restored from mc_fp/mc_i7. Signed-off-by: Matt Turner Cc: Mark Cave-Ayland Signed-off-by: Helge Deller --- linux-user/sparc/signal.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/linux-user/sparc/signal.c b/linux-user/sparc/signal.c index d339f89928..fda5508c48 100644 --- a/linux-user/sparc/signal.c +++ b/linux-user/sparc/signal.c @@ -656,6 +656,24 @@ void sparc64_set_context(CPUSPARCState *env) __get_user(env->regwptr[WREG_FP], &(ucp->tuc_mcontext.mc_fp)); __get_user(env->regwptr[WREG_I7], &(ucp->tuc_mcontext.mc_i7)); + /* + * The kernel's do_rt_sigreturn loads L and I registers from the + * register save area (RSA) at the new O6+STACK_BIAS. Unlike the + * kernel, QEMU has no kernel-mode path that triggers a window fill, + * so we must do it explicitly here. I6 and I7 are already restored + * from mc_fp and mc_i7 above; restore L0-L7 and I0-I5 from the RSA. + */ + { + abi_ulong sp_ptr = env->regwptr[WREG_O6]; + /* LP64 O6 is biased (8-byte-aligned - 2047); low bit set. ILP32 O6 is 4-byte-aligned. */ + if (sp_ptr & 3) + sp_ptr += TARGET_STACK_BIAS; + for (i = 0; i < 8; i++) + get_user_ual(env->regwptr[WREG_L0 + i], sp_ptr + i * 8); + for (i = 0; i < 6; i++) /* I0-I5; I6=FP and I7 already restored */ + get_user_ual(env->regwptr[WREG_I0 + i], sp_ptr + 64 + i * 8); + } + fpup = &ucp->tuc_mcontext.mc_fpregs; __get_user(fenab, &(fpup->mcfpu_enab)); -- 2.54.0