From owner-freebsd-arm@freebsd.org Thu Oct 24 14:54:51 2019 Return-Path: Delivered-To: freebsd-arm@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 6F29F16EE29 for ; Thu, 24 Oct 2019 14:54:51 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 46zVdk2btKz3MDg for ; Thu, 24 Oct 2019 14:54:50 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from tom.home (kib@localhost [127.0.0.1]) by kib.kiev.ua (8.15.2/8.15.2) with ESMTPS id x9OEsa4v080073 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Thu, 24 Oct 2019 17:54:40 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua x9OEsa4v080073 Received: (from kostik@localhost) by tom.home (8.15.2/8.15.2/Submit) id x9OEsaNV080072; Thu, 24 Oct 2019 17:54:36 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 24 Oct 2019 17:54:36 +0300 From: Konstantin Belousov To: Nick Kostirya Cc: freebsd-arm@freebsd.org Subject: Re: ucontext Message-ID: <20191024145436.GX73312@kib.kiev.ua> References: <20191024141133.04fb0693@i11.co> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191024141133.04fb0693@i11.co> User-Agent: Mutt/1.12.2 (2019-09-21) X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on tom.home X-Rspamd-Queue-Id: 46zVdk2btKz3MDg X-Spamd-Bar: - Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=gmail.com (policy=none); spf=softfail (mx1.freebsd.org: 2001:470:d5e7:1::1 is neither permitted nor denied by domain of kostikbel@gmail.com) smtp.mailfrom=kostikbel@gmail.com X-Spamd-Result: default: False [-2.00 / 15.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; DMARC_POLICY_SOFTFAIL(0.10)[gmail.com : No valid SPF, No valid DKIM,none]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; IP_SCORE_FREEMAIL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; IP_SCORE(0.00)[ip: (-2.77), ipnet: 2001:470::/32(-4.61), asn: 6939(-3.45), country: US(-0.05)]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2] X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 24 Oct 2019 14:54:51 -0000 On Thu, Oct 24, 2019 at 02:11:33PM +0300, Nick Kostirya via freebsd-arm wrote: > Hello. > I want to port MLton to ARM. > There are file with access to ucontext_t structure. > > > static void catcher (__attribute__ ((unused)) int signo, > __attribute__ ((unused)) siginfo_t* info, > void* context) { > ucontext_t* ucp = (ucontext_t*)context; > #if (defined (__x86_64__)) > GC_handleSigProf ((code_pointer) ucp->uc_mcontext.mc_rip); > #elif (defined (__i386__)) > GC_handleSigProf ((code_pointer) ucp->uc_mcontext.mc_eip); > #else > #error Profiling handler is missing for this architecture > #endif > } > > Please, tell me what should I write for ARM. > > #elif (defined (__arm__)) > GC_handleSigProf ((code_pointer) ucp->uc_mcontext.mc_vfp_ptr); > > Is it? I believe you want uc_context.__gregs[_REG_PC] on arm (32bit) and uc_context.mc_gpregs.gp_elr on arm64 for aarch64. Sometimes the thumb bit (lowest bit in PC) leaks there, then you should mask it.