From patchwork Fri Sep 29 08:50:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 1841153 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=B2Sy3zHy; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RxkcT2sJSz1yp0 for ; Fri, 29 Sep 2023 18:52:09 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qm9Dk-0005Im-Pw; Fri, 29 Sep 2023 04:51:36 -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 1qm9Da-00059a-3G for qemu-devel@nongnu.org; Fri, 29 Sep 2023 04:51:26 -0400 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 1qm9DD-0005e9-5B for qemu-devel@nongnu.org; Fri, 29 Sep 2023 04:51:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695977462; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mNNZqgGBCRydSpAMm3CyVCUzTpS3bjgDJpddGBx98jU=; b=B2Sy3zHywSbkwhrRNbXXzkh8TTaEz5iJbyXuwhdWZsYtN2FPPGgkEbOxFYzn1dcdWTPzmi C9DFw9Zr2/KCFEDE4Sz+d4q9zmOPpdvnM3Qz1pkNvKLc16vUwm6Wmr6JO+4uuKIxwu6E1b lljPkU/pYskcaV+U+ymAP0jJI0P47hg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-687-lCh5EhyPOK65QNQSC-WqAw-1; Fri, 29 Sep 2023 04:50:55 -0400 X-MC-Unique: lCh5EhyPOK65QNQSC-WqAw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8FCE385A5A8; Fri, 29 Sep 2023 08:50:55 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.25]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6B9D910005D2; Fri, 29 Sep 2023 08:50:55 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 6C83021E6913; Fri, 29 Sep 2023 10:50:53 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Cc: stefanha@redhat.com, =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Peter Maydell Subject: [PULL 10/56] target/arm/hvf: Clean up local variable shadowing Date: Fri, 29 Sep 2023 10:50:07 +0200 Message-ID: <20230929085053.2789105-11-armbru@redhat.com> In-Reply-To: <20230929085053.2789105-1-armbru@redhat.com> References: <20230929085053.2789105-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.001, 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_H4=0.001, RCVD_IN_MSPIKE_WL=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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Philippe Mathieu-Daudé Per Peter Maydell analysis [*]: The hvf_vcpu_exec() function is not documented, but in practice its caller expects it to return either EXCP_DEBUG (for "this was a guest debug exception you need to deal with") or something else (presumably the intention being 0 for OK). The hvf_sysreg_read() and hvf_sysreg_write() functions are also not documented, but they return 0 on success, or 1 for a completely unrecognized sysreg where we've raised the UNDEF exception (but not if we raised an UNDEF exception for an unrecognized GIC sysreg -- I think this is a bug). We use this return value to decide whether we need to advance the PC past the insn or not. It's not the same as the return value we want to return from hvf_vcpu_exec(). Retain the variable as locally scoped but give it a name that doesn't clash with the other function-scoped variable. This fixes: target/arm/hvf/hvf.c:1936:13: error: declaration shadows a local variable [-Werror,-Wshadow] int ret = 0; ^ target/arm/hvf/hvf.c:1807:9: note: previous declaration is here int ret; ^ [*] https://lore.kernel.org/qemu-devel/CAFEAcA_e+fU6JKtS+W63wr9cCJ6btu_hT_ydZWOwC0kBkDYYYQ@mail.gmail.com/ Signed-off-by: Philippe Mathieu-Daudé Message-ID: <20230904161235.84651-4-philmd@linaro.org> Reviewed-by: Peter Maydell Signed-off-by: Markus Armbruster --- target/arm/hvf/hvf.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index 546c0e817f..757e13b0f9 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -1934,16 +1934,16 @@ int hvf_vcpu_exec(CPUState *cpu) uint32_t rt = (syndrome >> 5) & 0x1f; uint32_t reg = syndrome & SYSREG_MASK; uint64_t val; - int ret = 0; + int sysreg_ret = 0; if (isread) { - ret = hvf_sysreg_read(cpu, reg, rt); + sysreg_ret = hvf_sysreg_read(cpu, reg, rt); } else { val = hvf_get_reg(cpu, rt); - ret = hvf_sysreg_write(cpu, reg, val); + sysreg_ret = hvf_sysreg_write(cpu, reg, val); } - advance_pc = !ret; + advance_pc = !sysreg_ret; break; } case EC_WFX_TRAP: