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Wed, 21 Jun 2023 20:36:43 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0EB7620043; Wed, 21 Jun 2023 20:36:43 +0000 (GMT) Received: from heavy.boeblingen.de.ibm.com (unknown [9.179.1.208]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 21 Jun 2023 20:36:42 +0000 (GMT) From: Ilya Leoshkevich To: =?utf-8?q?Alex_Benn=C3=A9e?= , Laurent Vivier , Peter Maydell , Richard Henderson , David Hildenbrand Cc: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , qemu-devel@nongnu.org, qemu-arm@nongnu.org, qemu-s390x@nongnu.org, Ilya Leoshkevich Subject: [PATCH v4 3/8] linux-user: Emulate /proc/self/smaps Date: Wed, 21 Jun 2023 22:36:22 +0200 Message-Id: <20230621203627.1808446-4-iii@linux.ibm.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230621203627.1808446-1-iii@linux.ibm.com> References: <20230621203627.1808446-1-iii@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: kK1gxCTdCrJrcv31Z92vArUK77-V1oli X-Proofpoint-ORIG-GUID: bZGMfZESkRzPWgw_XO8rpx44dPCIMIbF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-21_12,2023-06-16_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 malwarescore=0 clxscore=1015 phishscore=0 suspectscore=0 mlxscore=0 priorityscore=1501 adultscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306210172 Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org /proc/self/smaps is an extension of /proc/self/maps: it provides the same lines, plus additional information about each range. GDB uses /proc/self/smaps when available, which means that generate-core-file tries it first before falling back to /proc/self/maps. This, in turn, causes it to dump the host mappings, since /proc/self/smaps is not emulated and is just passed through. Fix by emulating /proc/self/smaps. Provide true values only for Size, KernelPageSize, MMUPageSize and VmFlags. Leave all other values at 0, which is a valid conservative estimate. Signed-off-by: Ilya Leoshkevich Reviewed-by: Richard Henderson --- linux-user/syscall.c | 58 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 57 insertions(+), 1 deletion(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index ecd9f5e23d..08162cc966 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8042,7 +8042,36 @@ static int open_self_cmdline(CPUArchState *cpu_env, int fd) return 0; } -static int open_self_maps(CPUArchState *cpu_env, int fd) +static void show_smaps(int fd, unsigned long size) +{ + unsigned long page_size_kb = TARGET_PAGE_SIZE >> 10; + unsigned long size_kb = size >> 10; + + dprintf(fd, "Size: %lu kB\n" + "KernelPageSize: %lu kB\n" + "MMUPageSize: %lu kB\n" + "Rss: 0 kB\n" + "Pss: 0 kB\n" + "Pss_Dirty: 0 kB\n" + "Shared_Clean: 0 kB\n" + "Shared_Dirty: 0 kB\n" + "Private_Clean: 0 kB\n" + "Private_Dirty: 0 kB\n" + "Referenced: 0 kB\n" + "Anonymous: 0 kB\n" + "LazyFree: 0 kB\n" + "AnonHugePages: 0 kB\n" + "ShmemPmdMapped: 0 kB\n" + "FilePmdMapped: 0 kB\n" + "Shared_Hugetlb: 0 kB\n" + "Private_Hugetlb: 0 kB\n" + "Swap: 0 kB\n" + "SwapPss: 0 kB\n" + "Locked: 0 kB\n" + "THPeligible: 0\n", size_kb, page_size_kb, page_size_kb); +} + +static int open_self_maps_1(CPUArchState *cpu_env, int fd, bool smaps) { CPUState *cpu = env_cpu(cpu_env); TaskState *ts = cpu->opaque; @@ -8089,6 +8118,18 @@ static int open_self_maps(CPUArchState *cpu_env, int fd) } else { dprintf(fd, "\n"); } + if (smaps) { + show_smaps(fd, max - min); + dprintf(fd, "VmFlags:%s%s%s%s%s%s%s%s\n", + (flags & PAGE_READ) ? " rd" : "", + (flags & PAGE_WRITE_ORG) ? " wr" : "", + (flags & PAGE_EXEC) ? " ex" : "", + e->is_priv ? "" : " sh", + (flags & PAGE_READ) ? " mr" : "", + (flags & PAGE_WRITE_ORG) ? " mw" : "", + (flags & PAGE_EXEC) ? " me" : "", + e->is_priv ? "" : " ms"); + } } } @@ -8103,11 +8144,25 @@ static int open_self_maps(CPUArchState *cpu_env, int fd) " --xp 00000000 00:00 0", TARGET_VSYSCALL_PAGE, TARGET_VSYSCALL_PAGE + TARGET_PAGE_SIZE); dprintf(fd, "%*s%s\n", 73 - count, "", "[vsyscall]"); + if (smaps) { + show_smaps(fd, TARGET_PAGE_SIZE); + dprintf(fd, "VmFlags: ex\n"); + } #endif return 0; } +static int open_self_maps(CPUArchState *cpu_env, int fd) +{ + return open_self_maps_1(cpu_env, fd, false); +} + +static int open_self_smaps(CPUArchState *cpu_env, int fd) +{ + return open_self_maps_1(cpu_env, fd, true); +} + static int open_self_stat(CPUArchState *cpu_env, int fd) { CPUState *cpu = env_cpu(cpu_env); @@ -8459,6 +8514,7 @@ int do_guest_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, const struct fake_open *fake_open; static const struct fake_open fakes[] = { { "maps", open_self_maps, is_proc_myself }, + { "smaps", open_self_smaps, is_proc_myself }, { "stat", open_self_stat, is_proc_myself }, { "auxv", open_self_auxv, is_proc_myself }, { "cmdline", open_self_cmdline, is_proc_myself },