From patchwork Fri Feb 3 14:49:18 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Riku Voipio X-Patchwork-Id: 139397 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [140.186.70.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 3906D104792 for ; Sat, 4 Feb 2012 02:24:40 +1100 (EST) Received: from localhost ([::1]:41690 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RtKTZ-0001fj-Mt for incoming@patchwork.ozlabs.org; Fri, 03 Feb 2012 09:50:57 -0500 Received: from eggs.gnu.org ([140.186.70.92]:46193) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RtKSL-0007to-BO for qemu-devel@nongnu.org; Fri, 03 Feb 2012 09:49:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1RtKSE-0001U8-W4 for qemu-devel@nongnu.org; Fri, 03 Feb 2012 09:49:41 -0500 Received: from afflict.kos.to ([92.243.29.197]:49799) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1RtKSE-0001TU-I2 for qemu-devel@nongnu.org; Fri, 03 Feb 2012 09:49:34 -0500 Received: by afflict.kos.to (Postfix, from userid 1000) id 4755126532; Fri, 3 Feb 2012 14:49:32 +0000 (UTC) From: riku.voipio@linaro.org To: qemu-devel@nongnu.org Date: Fri, 3 Feb 2012 16:49:18 +0200 Message-Id: <480b8e7dd56746c550a8ae9d7d1ba5d22cf1a4ee.1328280144.git.riku.voipio@linaro.org> X-Mailer: git-send-email 1.7.1 In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 92.243.29.197 Cc: Alexander Graf Subject: [Qemu-devel] [PATCH 05/19] linux-user: fake /proc/self/stat X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Alexander Graf The boehm gc finds the program's stack starting pointer by checking /proc/self/stat. Unfortunately, so far it reads qemu's stack pointer which clearly is wrong. So let's instead fake the file so the guest program sees the right address. Signed-off-by: Alexander Graf Signed-off-by: Riku Voipio --- linux-user/syscall.c | 26 ++++++++++++++++++++++++++ 1 files changed, 26 insertions(+), 0 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 1864d7f..5a5fdac 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -4614,6 +4614,31 @@ static int open_self_maps(void *cpu_env, int fd) return 0; } +static int open_self_stat(void *cpu_env, int fd) +{ + TaskState *ts = ((CPUState *)cpu_env)->opaque; + abi_ulong start_stack = ts->info->start_stack; + int i; + + for (i = 0; i < 44; i++) { + char buf[128]; + int len; + uint64_t val = 0; + + if (i == 27) { + /* stack bottom */ + val = start_stack; + } + snprintf(buf, sizeof(buf), "%"PRId64 "%c", val, i == 43 ? '\n' : ' '); + len = strlen(buf); + if (write(fd, buf, len) != len) { + return -1; + } + } + + return 0; +} + static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode) { struct fake_open { @@ -4623,6 +4648,7 @@ static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode) const struct fake_open *fake_open; static const struct fake_open fakes[] = { { "/proc/self/maps", open_self_maps }, + { "/proc/self/stat", open_self_stat }, { NULL, NULL } };