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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9B06C433FE for ; Wed, 29 Sep 2021 13:24:15 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id A4C6261411 for ; Wed, 29 Sep 2021 13:24:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org A4C6261411 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linaro.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:44934 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mVZZG-0001ON-SC for qemu-devel@archiver.kernel.org; Wed, 29 Sep 2021 09:24:14 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:39480) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVZII-0007Mx-3n for qemu-devel@nongnu.org; Wed, 29 Sep 2021 09:06:42 -0400 Received: from mail-oi1-x235.google.com ([2607:f8b0:4864:20::235]:36781) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mVZIG-0006Mf-Bs for qemu-devel@nongnu.org; Wed, 29 Sep 2021 09:06:41 -0400 Received: by mail-oi1-x235.google.com with SMTP id y201so2809998oie.3 for ; Wed, 29 Sep 2021 06:06:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=MmSCGYIFzfMZzarwBYHnm0N3s8Oxz8OvMDOHLBQ9iBw=; b=xIGAflf67FDK6UWvw0vzQ8mB6cZeXGB5mDEBNdeWoQ3NXx7nW0ybQg/+d60CIIiAaz G1V6xAmLl+kAnl8xpwpsDBFJ1tf3qKg1NcmGmmt+Pqqe2IJ6OrkX11bcV9r1g6RFBWdn YyKlNzijtYxKjoJQkffltVedsaavvBzwXLbfxkMUO0WeNY6i8uJYp8y6iGnFKtOlWqJN K8xGuV9XLXsnSqKL0LgIzoALeCEPHEImC7DfBw2V6aYfigfcaAkbChItXdNl8egcwh0Q zmKZ8BFs16T/cmEBoa0XgXeEeezwjX4Z5hwFMhJjCwOAo9s5vwVbZsM4+WWzdvISVYsU hb6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=MmSCGYIFzfMZzarwBYHnm0N3s8Oxz8OvMDOHLBQ9iBw=; b=q8swQQ8FGmz49a2T7KScro8BbmHHDWPp9z58yO/zw5FHqzL3slbikagx9S9SUCqUIg J91URbvcPvqBA6YptM4pN4/SjioCdGyfDbd/dl0gC1BvG0+UYNU82k8Y2L/kIsCJTo6k BzeIL26SGbVt0P3gF7lIxeU8hRmP2fNoUWZnLCjhSN2LJlxW7/rBs01XShZbaMg70LN1 FSwBX6jtaMa9nQnipNfACKFT+gkcfOPVKppci4tAcA+v/TBQBNbLssGFp1DreH0IjocW TVXJt8iZlrseuAUpJuBMw1wmTvzyfOMFNkfi94iZ+a8Ove+kMwyazgCimr+35b95ZGsL oE+A== X-Gm-Message-State: AOAM530n+pJKfQHnR1fKM91j5AgHjBhIbqp5psNQFYRkxhk6qOy1jdWq m/O+GYQAr+ZB04mCABXV/nV4A2WLfIOa7A== X-Google-Smtp-Source: ABdhPJzpPbsXafQamrJIBc9+qvujBkzLbyVxXjeX6Ji3wvhrd/x6lJYEGKesuSxMJ6gz4mahezGvFA== X-Received: by 2002:a05:6808:180a:: with SMTP id bh10mr7998306oib.6.1632920798220; Wed, 29 Sep 2021 06:06:38 -0700 (PDT) Received: from localhost.localdomain ([172.58.171.248]) by smtp.gmail.com with ESMTPSA id w1sm442823ote.41.2021.09.29.06.06.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Sep 2021 06:06:37 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v5 19/26] linux-user/ppc: Implement setup_sigtramp Date: Wed, 29 Sep 2021 09:05:46 -0400 Message-Id: <20210929130553.121567-20-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210929130553.121567-1-richard.henderson@linaro.org> References: <20210929130553.121567-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::235; envelope-from=richard.henderson@linaro.org; helo=mail-oi1-x235.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=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, alex.bennee@linaro.org, laurent@vivier.eu, Peter Maydell Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Create and record the two signal trampolines. Cc: qemu-ppc@nongnu.org Reviewed-by: Peter Maydell Signed-off-by: Richard Henderson --- linux-user/ppc/target_signal.h | 2 ++ linux-user/ppc/signal.c | 34 ++++++++++++++++++---------------- 2 files changed, 20 insertions(+), 16 deletions(-) diff --git a/linux-user/ppc/target_signal.h b/linux-user/ppc/target_signal.h index 72fcdd9bfa..82184ab8f2 100644 --- a/linux-user/ppc/target_signal.h +++ b/linux-user/ppc/target_signal.h @@ -24,4 +24,6 @@ typedef struct target_sigaltstack { #if !defined(TARGET_PPC64) #define TARGET_ARCH_HAS_SETUP_FRAME #endif +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* PPC_TARGET_SIGNAL_H */ diff --git a/linux-user/ppc/signal.c b/linux-user/ppc/signal.c index 77f37b9f01..c37744c8fc 100644 --- a/linux-user/ppc/signal.c +++ b/linux-user/ppc/signal.c @@ -203,9 +203,6 @@ struct target_func_ptr { #endif -/* We use the mc_pad field for the signal return trampoline. */ -#define tramp mc_pad - /* See arch/powerpc/kernel/signal.c. */ static target_ulong get_sigframe(struct target_sigaction *ka, CPUPPCState *env, @@ -436,12 +433,7 @@ void setup_frame(int sig, struct target_sigaction *ka, /* Save user regs. */ save_user_regs(env, &frame->mctx); - /* Construct the trampoline code on the stack. */ - encode_trampoline(TARGET_NR_sigreturn, (uint32_t *)&frame->mctx.tramp); - - /* The kernel checks for the presence of a VDSO here. We don't - emulate a vdso, so use a sigreturn system call. */ - env->lr = (target_ulong) h2g(frame->mctx.tramp); + env->lr = default_sigreturn; /* Turn off all fp exceptions. */ env->fpscr = 0; @@ -477,7 +469,6 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, target_sigset_t *set, CPUPPCState *env) { struct target_rt_sigframe *rt_sf; - uint32_t *trampptr = 0; struct target_mcontext *mctx = 0; target_ulong rt_sf_addr, newsp = 0; int i, err = 0; @@ -507,22 +498,17 @@ void setup_rt_frame(int sig, struct target_sigaction *ka, #if defined(TARGET_PPC64) mctx = &rt_sf->uc.tuc_sigcontext.mcontext; - trampptr = &rt_sf->trampoline[0]; sc = &rt_sf->uc.tuc_sigcontext; __put_user(h2g(mctx), &sc->regs); __put_user(sig, &sc->signal); #else mctx = &rt_sf->uc.tuc_mcontext; - trampptr = (uint32_t *)&rt_sf->uc.tuc_mcontext.tramp; #endif save_user_regs(env, mctx); - encode_trampoline(TARGET_NR_rt_sigreturn, trampptr); - /* The kernel checks for the presence of a VDSO here. We don't - emulate a vdso, so use a sigreturn system call. */ - env->lr = (target_ulong) h2g(trampptr); + env->lr = default_rt_sigreturn; /* Turn off all fp exceptions. */ env->fpscr = 0; @@ -720,3 +706,19 @@ abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx, return 0; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp = lock_user(VERIFY_WRITE, sigtramp_page, 2 * 8, 0); + assert(tramp != NULL); + +#ifdef TARGET_ARCH_HAS_SETUP_FRAME + default_sigreturn = sigtramp_page; + encode_trampoline(TARGET_NR_sigreturn, tramp + 0); +#endif + + default_rt_sigreturn = sigtramp_page + 8; + encode_trampoline(TARGET_NR_rt_sigreturn, tramp + 2); + + unlock_user(tramp, sigtramp_page, 2 * 8); +} -- 2.25.1