From nobody Wed Feb 11 02:56:33 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1633333660799676.1793617973046; Mon, 4 Oct 2021 00:47:40 -0700 (PDT) Received: from localhost ([::1]:42220 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mXIhH-0006th-Ro for importer@patchew.org; Mon, 04 Oct 2021 03:47:39 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44098) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXIeM-00048F-DH for qemu-devel@nongnu.org; Mon, 04 Oct 2021 03:44:38 -0400 Received: from mout.kundenserver.de ([212.227.126.134]:57997) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXIeJ-0004oa-6m for qemu-devel@nongnu.org; Mon, 04 Oct 2021 03:44:37 -0400 Received: from quad ([82.142.3.114]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.167]) with ESMTPSA (Nemesis) id 1MEC8L-1mhRfR2stB-00AFRl; Mon, 04 Oct 2021 09:44:24 +0200 From: Laurent Vivier To: qemu-devel@nongnu.org Subject: [PULL 02/26] linux-user/aarch64: Implement setup_sigtramp Date: Mon, 4 Oct 2021 09:43:57 +0200 Message-Id: <20211004074421.3141222-3-laurent@vivier.eu> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211004074421.3141222-1-laurent@vivier.eu> References: <20211004074421.3141222-1-laurent@vivier.eu> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:UUo/MIhsvSBxqSlSr/5Haj4RKGK6NXQdy2Lhrtm0Ftm+vXIn+ql rLFjFpI/4Af8hUSSlQ6FIJgA23Y9oC3Pi6TAod/vgK4a7LhS+9p8Bs87K6BzdLv2m9bkBL5 G+fc7+VrXDYTm0u2Tb64+QDz/LtsnUL0iE7ayVmVNXvCfiopzFTCbhR8k45hbbVo3YU26Z3 g+5EgQTuQnBpfhZA1eFgQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:QyAXt03HjcQ=:D0yY+QJvZK0rSkIUQp/jKI L2hzrP5sEYxiLmmtJxm0m+BXZtg3ZX5gJeOqhk34s+zcxOWbaBCrTD+OPozuYqlEe0123T2Hj 2C+o06JBwpl2pY+MATE1wAJd/a80mPJbZbQcij81kbCroZgiN10zaVdYp3IrOW8SHqkjRf7WQ FnQoF9pC0PC+7ISqe0UufRL7pFtxcZb2/Y5Yrnx4PeuLj6vFyFrIvRwpiYrlRS7Y0u3il9R4o unIK9iajeLz2Iqz5dWrslA1irXTXo4YXVPXIq1CHe8vZ8q8MYQQ3JSW7fKqzuygHhgV9WpQPR SfRjUciVhQO+VXngGD7d/HQXdAfEw4krXsGozVEtvHF837Cd/7mSIBN0tR1+rfumpASufFfFE 0NGK51mE+Ql7KRhZZS18AKeIDM26C+sWf9cv8arjNnffzBfXakGmmF6Sp+g+R/DLOmMCnBRRH Z1DK+P6NQ0XOI3shpOcywPeF2jXI8e4CWoExGe+7yNr2v0VD47sAH8318b2N+rhl6v7/mQIeX J2Sqxoq7v6PkhOxGGHRDzeUxuo5XLTYMqEXqc+F3IlOPcJPEwoqmsikKg4w/4Q0TPh/2REHEG 0HUO4HCDcSDJZ28waUnLxV7/JsO6F3fDn/5A1dlvSAkpAVHcMZyHByxXf+eDJulTaNSBv1I7w IxjMGB4wgWUC/XTbTqdyvVtI1tVOvhY/wlTdSr31sKuqpqy1FHswWiO/Rztgr2+MHSXKeUVyk 28Msm6JQ3B0+vKZaTW3rCWYXLvhXbhh78F8F3A== 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: none client-ip=212.227.126.134; envelope-from=laurent@vivier.eu; helo=mout.kundenserver.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=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 , Richard Henderson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Laurent Vivier Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1633333662238100001 From: Richard Henderson Create and record the rt signal trampoline. Use it when the guest does not use SA_RESTORER. Reviewed-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson Message-Id: <20210929130553.121567-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier --- linux-user/aarch64/signal.c | 34 ++++++++++++++++++------------ linux-user/aarch64/target_signal.h | 2 ++ 2 files changed, 23 insertions(+), 13 deletions(-) diff --git a/linux-user/aarch64/signal.c b/linux-user/aarch64/signal.c index 49025648cb4f..29c52db3f130 100644 --- a/linux-user/aarch64/signal.c +++ b/linux-user/aarch64/signal.c @@ -109,7 +109,6 @@ struct target_rt_sigframe { struct target_rt_frame_record { uint64_t fp; uint64_t lr; - uint32_t tramp[2]; }; =20 static void target_setup_general_frame(struct target_rt_sigframe *sf, @@ -461,9 +460,9 @@ static void target_setup_frame(int usig, struct target_= sigaction *ka, layout.total_size =3D MAX(layout.total_size, sizeof(struct target_rt_sigframe)); =20 - /* Reserve space for the return code. On a real system this would - * be within the VDSO. So, despite the name this is not a "real" - * record within the frame. + /* + * Reserve space for the standard frame unwind pair: fp, lr. + * Despite the name this is not a "real" record within the frame. */ fr_ofs =3D layout.total_size; layout.total_size +=3D sizeof(struct target_rt_frame_record); @@ -496,15 +495,7 @@ static void target_setup_frame(int usig, struct target= _sigaction *ka, if (ka->sa_flags & TARGET_SA_RESTORER) { return_addr =3D ka->sa_restorer; } else { - /* - * mov x8,#__NR_rt_sigreturn; svc #0 - * Since these are instructions they need to be put as little-endi= an - * regardless of target default or current CPU endianness. - */ - __put_user_e(0xd2801168, &fr->tramp[0], le); - __put_user_e(0xd4000001, &fr->tramp[1], le); - return_addr =3D frame_addr + fr_ofs - + offsetof(struct target_rt_frame_record, tramp); + return_addr =3D default_rt_sigreturn; } env->xregs[0] =3D usig; env->xregs[29] =3D frame_addr + fr_ofs; @@ -577,3 +568,20 @@ long do_sigreturn(CPUARMState *env) { return do_rt_sigreturn(env); } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint32_t *tramp =3D lock_user(VERIFY_WRITE, sigtramp_page, 8, 0); + assert(tramp !=3D NULL); + + /* + * mov x8,#__NR_rt_sigreturn; svc #0 + * Since these are instructions they need to be put as little-endian + * regardless of target default or current CPU endianness. + */ + __put_user_e(0xd2801168, &tramp[0], le); + __put_user_e(0xd4000001, &tramp[1], le); + + default_rt_sigreturn =3D sigtramp_page; + unlock_user(tramp, sigtramp_page, 8); +} diff --git a/linux-user/aarch64/target_signal.h b/linux-user/aarch64/target= _signal.h index 18013e1b2350..7580d99403cb 100644 --- a/linux-user/aarch64/target_signal.h +++ b/linux-user/aarch64/target_signal.h @@ -25,4 +25,6 @@ typedef struct target_sigaltstack { #define TARGET_SEGV_MTESERR 9 /* Synchronous ARM MTE exception */ =20 #define TARGET_ARCH_HAS_SETUP_FRAME +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* AARCH64_TARGET_SIGNAL_H */ --=20 2.31.1