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[209.51.188.17]) by mx.google.com with ESMTPS id v12si8389024vso.129.2021.06.18.12.35.23 for (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Fri, 18 Jun 2021 12:35:23 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=ulS4pyoB; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:40392 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1luKGw-0001oB-IG for patch@linaro.org; Fri, 18 Jun 2021 15:35:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58284) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1luKBn-0001ZN-Tr for qemu-devel@nongnu.org; Fri, 18 Jun 2021 15:30:04 -0400 Received: from mail-pf1-x42a.google.com ([2607:f8b0:4864:20::42a]:38639) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1luKBi-0001Sj-MV for qemu-devel@nongnu.org; Fri, 18 Jun 2021 15:30:03 -0400 Received: by mail-pf1-x42a.google.com with SMTP id z26so8438737pfj.5 for ; Fri, 18 Jun 2021 12:29:58 -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=9uDmWChPs4lp5UI8b6weWaZXX8zbdz4czXb1drnckGg=; b=ulS4pyoB01ZaWpSAAqvb0/v1/U+/UDZcRnwG2IUgbYQ1Eio4F3ASbQIWDQxCNN1bAG T15drD+tdC5b9aUjLpyHwPLvxuvhq4wWb+CkRbYn0J6eirmNDkXHnxGOJvwPdYHao1wT kz+L1qMSdJN4EAYlwP4iHUvMsUWKKnoDUGvpSb4Coj1pEL8LsOEuIGgIp+rFPbpa3Mh+ NzGaiNAvbouQ4qnA53fWdQXq7ypBewhgc2Zcbvrin1pdWmhv5PlRg5qpQGsnofsjpL9e jAU9GuLbNcoqhsanq1KFLkli8lVDbJf3GlEZmrDh1df7FyXsGBL2IKaem4qGDFeKRv5f 8GYg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=9uDmWChPs4lp5UI8b6weWaZXX8zbdz4czXb1drnckGg=; b=RgNqvpDfMdbI2E5fedY1LdmV6QMI0FeSYyvzRf75AbKxX+cr1YbMecdnMO45XqO7N2 EubrtylsquodzvmU40n2x4JE0eKAzbUsXNj73cdMcKs22iP99ksgRjd8CXFN7hvSAa6W Nlyt5Z/tOFFs5LV/3dDlSZxG4aD1IGT/xxCyaq6Djklznemtvyiy4sTorG13nURXqy7B qM/rXxsg87q0GuSXDpVKzWpNXidCTS7oKdZC34Ph5igbsHIX24Pd9rU29wsN57Vw4o3W b4wQoHN7lKIsxFWqYyY32EQrhCZJ1j6VVEMQwrc5Bo7t9xAYBneOdlm/VXldASS7p7YQ 76hw== X-Gm-Message-State: AOAM533k6fY7NBNlKkariZc4uyPUs+P5rtm1SBtk1ib+p9KG9jUG8weU eypVsdBJPnLfGnodkjkR9CB0mH9k89rW6w== X-Received: by 2002:a65:6a12:: with SMTP id m18mr11450996pgu.229.1624044597375; Fri, 18 Jun 2021 12:29:57 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id 92sm11938234pjv.29.2021.06.18.12.29.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Jun 2021 12:29:57 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 09/23] linux-user/hppa: Document non-use of setup_sigtramp Date: Fri, 18 Jun 2021 12:29:37 -0700 Message-Id: <20210618192951.125651-10-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210618192951.125651-1-richard.henderson@linaro.org> References: <20210618192951.125651-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::42a; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x42a.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=ham 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: alex.bennee@linaro.org, laurent@vivier.eu, =?utf-8?q?Philippe_Mathieu-?= =?utf-8?b?RGF1ZMOp?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" We cannot use a raw sigtramp page for hppa, but must wait for full vdso support. Reviewed-by: Alex Bennée Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Richard Henderson --- linux-user/hppa/target_signal.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) -- 2.25.1 diff --git a/linux-user/hppa/target_signal.h b/linux-user/hppa/target_signal.h index 7f525362e9..d558119ee7 100644 --- a/linux-user/hppa/target_signal.h +++ b/linux-user/hppa/target_signal.h @@ -71,4 +71,18 @@ typedef struct target_sigaltstack { /* mask for all SS_xxx flags */ #define TARGET_SS_FLAG_BITS TARGET_SS_AUTODISARM +/* + * We cannot use a bare sigtramp page for hppa-linux. + * + * Unlike other guests where we use the instructions at PC to validate + * an offset from SP, the hppa libgcc signal frame fallback unwinding uses + * the PC address itself to find the frame. This is due to the fact that + * the hppa grows the stack upward, and the frame is of unknown size. + * + * TODO: We should be able to use a VDSO to address this, by providing + * proper unwind info for the sigtramp code, at which point the fallback + * unwinder will not be used. + */ +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 0 + #endif /* HPPA_TARGET_SIGNAL_H */