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[24.31.215.130]) by smtp.gmail.com with ESMTPSA id g12sm12530370qtm.59.2021.09.27.19.00.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Sep 2021 19:00:48 -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=1f4aYpKsB+ja4QJ7hAEtER7A5IlRmh/mgnhLrHPEyy0=; b=JmwpBSC/6IDY0zjOmFDq0MFGYtgVaeUZpBt1O0spFK9O2OjmPAJ7Piy6cpK31Saaw4 o6IPPE4AQj/mMj2TWXZnQTHjjtr+1tnldK249suwbYuP+BwRNDq919jGS3N2Q2NOhChF p2I9jfuvGXCHUKfINBRligjgIMSlDmkhhtc7THtDA75uZENGt3z/qMmOp7wlmEEzDIYn ZKGBIn/WI9aX1BOJp8bqxhW3bN8nAo5c92CocWgWh8Aj9WXsXmOeILYLx2oXrZ+Iv5TW IvcbS001hOBeI0CMg2PZ6nYouf7d3X2yZbl57QR+duBFfo/BaR7rwVcEN+KohW77LYSU myGQ== 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=1f4aYpKsB+ja4QJ7hAEtER7A5IlRmh/mgnhLrHPEyy0=; b=STsCppXauKvosIELkSyy1ZPDR5gNNvWTfziDymb76lrMuVaFY0S98Qf/mFL6njp7Uq S8y9z2fDW7cQ/4XzgSQ7/TtNyWw4+BlbCIAfJOyTY9ZLViaR3yMOFcAL5NDreyXsr6k8 ehbL36pHswh6/hOeSHlWSt0j2BSIfBLlazsw924HDlRGLm72bVYCHoLITg0WLwj/n4vy r3GtPUBwfjeBjCGTEFgyQBAQMkk1GDsOkw5GljrZ7EYWx0NO3XozqY3pnHTOQE3KQCdY 1SKE3mDPFDTV92AZ1wHQD7aUaVJp9LgWck+/eNkEegKsnyhkGhOI5BKBj9zEYEk2kdjj aITQ== X-Gm-Message-State: AOAM533NFZHDrQEbJewQFikNds5CCDqHD6tTqAT9Gx1UzaEg936PLfa3 2gozPxV7Z8kLBe/68s94XmyuA4mn3brzmw== X-Google-Smtp-Source: ABdhPJwNdBm5zKo67YI++MAR9KaJrb4XWSM+xJ8YcPUbzy7RRwqDwe/9ye4A/6+XJEzx8M1KMgi5BA== X-Received: by 2002:a37:bc85:: with SMTP id m127mr3147429qkf.119.1632794448566; Mon, 27 Sep 2021 19:00:48 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v4 08/25] linux-user/hexagon: Implement setup_sigtramp Date: Mon, 27 Sep 2021 22:00:22 -0400 Message-Id: <20210928020039.184412-9-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210928020039.184412-1-richard.henderson@linaro.org> References: <20210928020039.184412-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::72c; envelope-from=richard.henderson@linaro.org; helo=mail-qk1-x72c.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: peter.maydell@linaro.org, Taylor Simpson , laurent@vivier.eu, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1632794924720100001 Continue to initialize the words on the stack, as documented. However, use the off-stack trampoline. Reviewed-by: Taylor Simpson Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson --- linux-user/hexagon/target_signal.h | 2 ++ linux-user/hexagon/signal.c | 19 +++++++++++++++++-- 2 files changed, 19 insertions(+), 2 deletions(-) diff --git a/linux-user/hexagon/target_signal.h b/linux-user/hexagon/target= _signal.h index 345cf1cbb8..9e0223d322 100644 --- a/linux-user/hexagon/target_signal.h +++ b/linux-user/hexagon/target_signal.h @@ -31,4 +31,6 @@ typedef struct target_sigaltstack { =20 #include "../generic/signal.h" =20 +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* TARGET_SIGNAL_H */ diff --git a/linux-user/hexagon/signal.c b/linux-user/hexagon/signal.c index c7f0bf6b92..74e61739a0 100644 --- a/linux-user/hexagon/signal.c +++ b/linux-user/hexagon/signal.c @@ -162,6 +162,11 @@ void setup_rt_frame(int sig, struct target_sigaction *= ka, =20 setup_ucontext(&frame->uc, env, set); tswap_siginfo(&frame->info, info); + /* + * The on-stack signal trampoline is no longer executed; + * however, the libgcc signal frame unwinding code checks + * for the presence of these two numeric magic values. + */ install_sigtramp(frame->tramp); =20 env->gpr[HEX_REG_PC] =3D ka->_sa_handler; @@ -171,8 +176,7 @@ void setup_rt_frame(int sig, struct target_sigaction *k= a, frame_addr + offsetof(struct target_rt_sigframe, info); env->gpr[HEX_REG_R02] =3D frame_addr + offsetof(struct target_rt_sigframe, uc); - env->gpr[HEX_REG_LR] =3D - frame_addr + offsetof(struct target_rt_sigframe, tramp); + env->gpr[HEX_REG_LR] =3D default_rt_sigreturn; =20 return; =20 @@ -271,3 +275,14 @@ badframe: force_sig(TARGET_SIGSEGV); return 0; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp =3D lock_user(VERIFY_WRITE, sigtramp_page, 4 * 2, 0); + assert(tramp !=3D NULL); + + default_rt_sigreturn =3D sigtramp_page; + install_sigtramp(tramp); + + unlock_user(tramp, sigtramp_page, 4 * 2); +} --=20 2.25.1