From patchwork Fri Jun 4 19:14:12 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Henderson X-Patchwork-Id: 54673 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 26906B7D1C for ; Sat, 5 Jun 2010 05:22:39 +1000 (EST) Received: from localhost ([127.0.0.1]:56470 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OKcTR-0000Mk-K5 for incoming@patchwork.ozlabs.org; Fri, 04 Jun 2010 15:22:33 -0400 Received: from [140.186.70.92] (port=37471 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1OKcMV-0004YH-W6 for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1OKcMR-0002As-5d for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:23 -0400 Received: from are.twiddle.net ([75.149.56.221]:54749) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1OKcMQ-0002Aa-Ja for qemu-devel@nongnu.org; Fri, 04 Jun 2010 15:15:19 -0400 Received: from anchor.twiddle.home (anchor.twiddle.home [172.31.0.4]) by are.twiddle.net (Postfix) with ESMTPS id 0B6B046D; Fri, 4 Jun 2010 12:15:16 -0700 (PDT) Received: from anchor.twiddle.home (anchor.twiddle.home [127.0.0.1]) by anchor.twiddle.home (8.14.4/8.14.4) with ESMTP id o54JFCke007177; Fri, 4 Jun 2010 12:15:12 -0700 Received: (from rth@localhost) by anchor.twiddle.home (8.14.4/8.14.4/Submit) id o54JF94k007176; Fri, 4 Jun 2010 12:15:09 -0700 From: Richard Henderson To: qemu-devel@nongnu.org Date: Fri, 4 Jun 2010 12:14:12 -0700 Message-Id: <1275678883-7082-5-git-send-email-rth@twiddle.net> X-Mailer: git-send-email 1.7.0.1 In-Reply-To: <1275678883-7082-1-git-send-email-rth@twiddle.net> References: <1275678883-7082-1-git-send-email-rth@twiddle.net> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) Cc: agraf@suse.de, aurelien@aurel32.net Subject: [Qemu-devel] [PATCH 04/35] tcg-s390: Compute is_write in cpu_signal_handler. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Signed-off-by: Richard Henderson --- cpu-exec.c | 42 +++++++++++++++++++++++++++++++++++++++--- 1 files changed, 39 insertions(+), 3 deletions(-) diff --git a/cpu-exec.c b/cpu-exec.c index c776605..026980a 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -1156,11 +1156,47 @@ int cpu_signal_handler(int host_signum, void *pinfo, siginfo_t *info = pinfo; struct ucontext *uc = puc; unsigned long pc; - int is_write; + uint16_t *pinsn; + int is_write = 0; pc = uc->uc_mcontext.psw.addr; - /* XXX: compute is_write */ - is_write = 0; + + /* ??? On linux, the non-rt signal handler has 4 (!) arguments instead + of the normal 2 arguments. The 3rd argument contains the "int_code" + from the hardware which does in fact contain the is_write value. + The rt signal handler, as far as I can tell, does not give this value + at all. Not that we could get to it from here even if it were. */ + /* ??? This is not even close to complete, since it ignores all + of the read-modify-write instructions. */ + pinsn = (uint16_t *)pc; + switch (pinsn[0] >> 8) { + case 0x50: /* ST */ + case 0x42: /* STC */ + case 0x40: /* STH */ + is_write = 1; + break; + case 0xc4: /* RIL format insns */ + switch (pinsn[0] & 0xf) { + case 0xf: /* STRL */ + case 0xb: /* STGRL */ + case 0x7: /* STHRL */ + is_write = 1; + } + break; + case 0xe3: /* RXY format insns */ + switch (pinsn[2] & 0xff) { + case 0x50: /* STY */ + case 0x24: /* STG */ + case 0x72: /* STCY */ + case 0x70: /* STHY */ + case 0x8e: /* STPQ */ + case 0x3f: /* STRVH */ + case 0x3e: /* STRV */ + case 0x2f: /* STRVG */ + is_write = 1; + } + break; + } return handle_cpu_signal(pc, (unsigned long)info->si_addr, is_write, &uc->uc_sigmask, puc); }