From patchwork Mon Nov 4 16:35:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Thomas Huth X-Patchwork-Id: 13861602 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 lists.gnu.org (lists.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 CD51DD1BDC3 for ; Mon, 4 Nov 2024 16:35:45 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t8035-0007qB-AP; Mon, 04 Nov 2024 11:35:27 -0500 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 1t8033-0007pn-6P for qemu-devel@nongnu.org; Mon, 04 Nov 2024 11:35:25 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t8031-0002zv-4u for qemu-devel@nongnu.org; Mon, 04 Nov 2024 11:35:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1730738121; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=/48wIK5DE80qGmqw0yIE/LG8E3OVVASTxKv9PepSHdI=; b=S9lgqh1/IdDcDcnVfi609RzeubCXdIDjOkC/XBJLPCBfTVcqNgdD+vOGXFQbgIBwkF1WGR 9rQLVFkOHk6WF7SskXMBDoirPZ3WsuPSmWekh7v50ZMg/FLDRJZ+b5sUJhGATbfkJMzRB7 erml+E4EyuL07jqvWw1Oe2UxsL7WNcE= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-587-L2dr0qugPVmv6S8XjEBABg-1; Mon, 04 Nov 2024 11:35:17 -0500 X-MC-Unique: L2dr0qugPVmv6S8XjEBABg-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4B2011956064; Mon, 4 Nov 2024 16:35:16 +0000 (UTC) Received: from thuth-p1g4.redhat.com (unknown [10.39.193.126]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D6ADB19560A2; Mon, 4 Nov 2024 16:35:10 +0000 (UTC) From: Thomas Huth To: Alistair Francis , Bin Meng , Palmer Dabbelt , qemu-riscv@nongnu.org Cc: =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , qemu-devel@nongnu.org, qemu-trivial@nongnu.org, Daniel Henrique Barboza , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Thomas Huth Subject: [PATCH] hw/char/sifive_uart: Fix broken UART on big endian hosts Date: Mon, 4 Nov 2024 17:35:04 +0100 Message-ID: <20241104163504.305955-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.34, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Casting a "uint32_t *" to a "uint8_t *" to get to the lowest 8-bit part of the value does not work on big endian hosts. We've got to take the proper detour through an 8-bit variable. Fixes: 53c1557b23 ("hw/char: sifive_uart: Print uart characters async") Signed-off-by: Thomas Huth Reviewed-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Alistair Francis --- hw/char/sifive_uart.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/hw/char/sifive_uart.c b/hw/char/sifive_uart.c index aeb45d3601..5ae2a29ed6 100644 --- a/hw/char/sifive_uart.c +++ b/hw/char/sifive_uart.c @@ -174,10 +174,11 @@ sifive_uart_write(void *opaque, hwaddr addr, { SiFiveUARTState *s = opaque; uint32_t value = val64; + uint8_t ch = value; switch (addr) { case SIFIVE_UART_TXFIFO: - sifive_uart_write_tx_fifo(s, (uint8_t *) &value, 1); + sifive_uart_write_tx_fifo(s, &ch, 1); return; case SIFIVE_UART_IE: s->ie = val64;