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[174.21.70.228]) by smtp.gmail.com with ESMTPSA id y18sm305297pgk.53.2021.06.15.18.12.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Jun 2021 18:12:21 -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=otFWOjo25PTZrmQ0CApLXIVYdTYiSF7ILSCJjVsE2Vk=; b=xIho14J9VZccF0xdHT0ReBhRINvgIEW8gbG06REgcdgBcmlXtBECTT/OvCS56DsKvT xlFC3Nlrh3rxB70ojUTr1m9mcNXEqKFNIRUeeUZfyriIPv9BkS5BgWcYHUmDwSF0y6mV 3m1iHnhlH1Dz0S7ThASFke1yb+KLKMOzSb1HqTKqaDzbVRO12MpCWuFwgBp3s+3Pxd+4 cnTlhgvccA4bgzsz+SrHgcIrgf+YAsJBR3HFPtJkd3TN8K4fmEj5NtPZa5VcB/Ygr5UV JOuYqfRJW+UwNswS0tev6W3kITjkNA54HNf/5L+8MTIFdRN9uZWzh86HK7Xa0ixP5S7O cwhg== 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=otFWOjo25PTZrmQ0CApLXIVYdTYiSF7ILSCJjVsE2Vk=; b=uadCWGheuJ8IXubte+h2hxzvQDF1zgX9JTt2nGygrrQYmuOwgd1okLBCbuObsiix69 /SWAGy3ElxhM6l9YS4OmUCGqN/vCnUT1X505uO/lJf80KGXKv7idIqQJuyALFgJIUncF CLKfXpevSaVY+Ojmt6MgoIoqPdNJ7oOKDjQfgBTRCXOYslv6/oCftA6y6KnubuAbgztI ECPa8G0Hhylg+Qycr8AJDq4zmtwp5H/9Q47M63Q2xQUTCJzfQiMkbpUeYpil/HSYfNE8 VCNhlwLjUwYJ1p5p7IL4UgLvJlkJeZeu9YqVyQhg5JymDinomllk0X7BZrG+PBqBWy/Z r3EA== X-Gm-Message-State: AOAM530EWDyFZ/WH+DeYOKBIiXAoiDQtK+4cmWYnwso1d94qcsJ5khpr B2Y7b8pFeFXfH+GRFAn55BJtbDavGtxDRA== X-Google-Smtp-Source: ABdhPJz12L0OLusJAXjRVhh+ckAonad7OxHZbMeXwsvs9YnssvAE6qXdWBxHwb+xqTPjnE7k+N5yHw== X-Received: by 2002:a17:90b:305:: with SMTP id ay5mr7819478pjb.0.1623805941588; Tue, 15 Jun 2021 18:12:21 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 17/21] linux-user/s390x: Implement setup_sigtramp Date: Tue, 15 Jun 2021 18:12:05 -0700 Message-Id: <20210616011209.1446045-18-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210616011209.1446045-1-richard.henderson@linaro.org> References: <20210616011209.1446045-1-richard.henderson@linaro.org> MIME-Version: 1.0 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::1031; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1031.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-s390x@nongnu.org, alex.bennee@linaro.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Create and record the two signal trampolines. Use them when the guest does not use SA_RESTORER. Cc: qemu-s390x@nongnu.org Signed-off-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- linux-user/s390x/target_signal.h | 2 ++ linux-user/s390x/signal.c | 24 ++++++++++++++++-------- 2 files changed, 18 insertions(+), 8 deletions(-) diff --git a/linux-user/s390x/target_signal.h b/linux-user/s390x/target_sig= nal.h index bbfc464d44..64f5f42201 100644 --- a/linux-user/s390x/target_signal.h +++ b/linux-user/s390x/target_signal.h @@ -19,4 +19,6 @@ typedef struct target_sigaltstack { #include "../generic/signal.h" =20 #define TARGET_ARCH_HAS_SETUP_FRAME +#define TARGET_ARCH_HAS_SIGTRAMP_PAGE 1 + #endif /* S390X_TARGET_SIGNAL_H */ diff --git a/linux-user/s390x/signal.c b/linux-user/s390x/signal.c index ef136dae33..806c09f921 100644 --- a/linux-user/s390x/signal.c +++ b/linux-user/s390x/signal.c @@ -67,7 +67,6 @@ typedef struct { target_sigregs sregs; int signo; target_sigregs_ext sregs_ext; - uint16_t retcode; } sigframe; =20 #define TARGET_UC_VXRS 2 @@ -84,7 +83,6 @@ struct target_ucontext { =20 typedef struct { uint8_t callee_used_stack[__SIGNAL_FRAMESIZE]; - uint16_t retcode; struct target_siginfo info; struct target_ucontext uc; } rt_sigframe; @@ -200,9 +198,7 @@ void setup_frame(int sig, struct target_sigaction *ka, if (ka->sa_flags & TARGET_SA_RESTORER) { restorer =3D ka->sa_restorer; } else { - restorer =3D frame_addr + offsetof(sigframe, retcode); - __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn, - &frame->retcode); + restorer =3D default_sigreturn; } =20 /* Set up registers for signal handler */ @@ -253,9 +249,7 @@ void setup_rt_frame(int sig, struct target_sigaction *k= a, if (ka->sa_flags & TARGET_SA_RESTORER) { restorer =3D ka->sa_restorer; } else { - restorer =3D frame_addr + offsetof(typeof(*frame), retcode); - __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn, - &frame->retcode); + restorer =3D default_rt_sigreturn; } =20 /* Create siginfo on the signal stack. */ @@ -377,3 +371,17 @@ long do_rt_sigreturn(CPUS390XState *env) unlock_user_struct(frame, frame_addr, 0); return -TARGET_QEMU_ESIGRETURN; } + +void setup_sigtramp(abi_ulong sigtramp_page) +{ + uint16_t *tramp =3D lock_user(VERIFY_WRITE, sigtramp_page, 4, 0); + assert(tramp !=3D NULL); + + default_sigreturn =3D sigtramp_page; + __put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn, &tramp[0]); + + default_rt_sigreturn =3D sigtramp_page + 2; + __put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn, &tramp[1]); + + unlock_user(tramp, sigtramp_page, 4); +} --=20 2.25.1