From patchwork Fri Feb 9 10:31:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexandra Petlanova Hajkova X-Patchwork-Id: 85513 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id BE731385840E for ; Fri, 9 Feb 2024 10:32:58 +0000 (GMT) X-Original-To: gdb-patches@sourceware.org Delivered-To: gdb-patches@sourceware.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id EEB373858C35 for ; Fri, 9 Feb 2024 10:32:28 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org EEB373858C35 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com ARC-Filter: OpenARC Filter v1.0.0 sourceware.org EEB373858C35 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1707474751; cv=none; b=abgl1KHOFMyzAahL53hhgNiXh1iQoCFrpOQruIiNa2GIJCrnlkTEwNwLkmevo1V59bBmqzMS3rkg1qzcudtOP2NUD33Ps7XEFb2uKhHWhEqTOK9HErIMZGPfbZLdFGQaXbNtnm9jg0NeM4hpGWYJYhe5BqN1BDLDdYSQ0VxNTz8= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1707474751; c=relaxed/simple; bh=vowz3aYGEpMjDY+t59WjChXdKECvfXv68MikDJ/aPHo=; h=DKIM-Signature:From:To:Subject:Date:Message-ID:MIME-Version; b=FNM2iYu/ySjOBQGwXH8Jm6+TslHn1nMLbl81GcPs/m3NT6N4wmSotVSa4VN3ZSTOWQgKmTtQTcgM3NT/o+ELYFn2LE7+Qq3zF5diU4hAi14uK62SzYZiRaUatxlvv+fXdaoAWTexwV3H8xnLNvjAZfyG0H+nKN+kzxEgtTsEnOU= ARC-Authentication-Results: i=1; server2.sourceware.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1707474748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=/62UEElLY4zDD4dunBVv+d6Obx/uPjoRJ35ajj5128M=; b=Z47GhAHoUDQiS41Y1wCad8ASc/E5v5rtnMb26FSLhaGM4VajcMX6GgXtWprrR27eYhWr8n QGK/Jmli1uJoaR3XZseubEvxGcWp4K6F+agw0q3Uqj0jMFaiUIxicU1EX63FEHD8ysuj+y WVujYa1T2342CBU3zE30zDj1K+ZGYiw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-635-R1VIK-txPbew1d8gtXXj7Q-1; Fri, 09 Feb 2024 05:32:27 -0500 X-MC-Unique: R1VIK-txPbew1d8gtXXj7Q-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2A48685A58B for ; Fri, 9 Feb 2024 10:32:27 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.242.18]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 70167492BC7 for ; Fri, 9 Feb 2024 10:32:26 +0000 (UTC) From: =?utf-8?q?Alexandra_H=C3=A1jkov=C3=A1?= To: gdb-patches@sourceware.org Subject: [PATCH v6] remote.c: Make packet_check_result return a structure Date: Fri, 9 Feb 2024 11:31:23 +0100 Message-ID: <20240209103224.113315-1-ahajkova@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-10.7 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces+patchwork=sourceware.org@sourceware.org packet_check_result currently returns an packet_result enum. If GDB will recieve an error in a format E.errtext, which is possible for some q packets, such errtext is lost if treated by packet_check_result. Introduce a new structure which bundles enum packet_result with possible error message or error code returned by the GDBserver. I plan to make more GDBserver response checking functions to use packet_check_result to make remote.c code more consistent. This will also allow to use E.errtext more in the future. Beside adding the unit test, I tested this by modifying store_registers_using_G function to get an error message: [remote] Sending packet: $GG00000000 ... gdbserver: Wrong sized register packet (expected 1792 bytes, got 1793) gdbserver: Invalid hex digit 71 Killing process(es): 1104002 [remote] Packet received: E01 Could not write registers; remote failure reply '01' Reviewed-by: Thiago Jung Bauermann --- v6: - cosmetics - fix the unit test gdb/remote.c | 138 ++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 104 insertions(+), 34 deletions(-) diff --git a/gdb/remote.c b/gdb/remote.c index f77548427a4..14c8b020b1e 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -149,13 +149,46 @@ get_target_type_name (bool target_connected) /* Analyze a packet's return value and update the packet config accordingly. */ -enum packet_result +enum packet_status { PACKET_ERROR, PACKET_OK, PACKET_UNKNOWN }; +/* Keeps packet's return value. If packet's return value is PACKET_ERROR, + err_msg contains an error message string from E.string or the number + stored as a string from E.num. */ +struct packet_result +{ + packet_result (enum packet_status status, std::string err_msg) + : m_status (status), m_err_msg (std::move (err_msg)) + { + gdb_assert (status == PACKET_ERROR); + } + + explicit packet_result (enum packet_status status) + : m_status (status) + { + gdb_assert (status != PACKET_ERROR); + } + + enum packet_status status () const + { + return this->m_status; + } + + const char *err_msg () const + { + gdb_assert (this->m_status == PACKET_ERROR); + return this->m_err_msg.c_str (); + } + +private: + enum packet_status m_status; + std::string m_err_msg; +}; + /* Enumeration of packets for a remote target. */ enum { @@ -732,8 +765,8 @@ struct remote_features /* Check result value in BUF for packet WHICH_PACKET and update the packet's support configuration accordingly. */ - packet_result packet_ok (const char *buf, const int which_packet); - packet_result packet_ok (const gdb::char_vector &buf, const int which_packet); + packet_status packet_ok (const char *buf, const int which_packet); + packet_status packet_ok (const gdb::char_vector &buf, const int which_packet); /* Configuration of a remote target's memory read packet. */ memory_packet_config m_memory_read_packet_config; @@ -1254,7 +1287,7 @@ class remote_target : public process_stratum_target int unit_size, ULONGEST *xfered_len); - packet_result remote_send_printf (const char *format, ...) + packet_status remote_send_printf (const char *format, ...) ATTRIBUTE_PRINTF (2, 3); target_xfer_status remote_flash_write (ULONGEST address, @@ -2418,7 +2451,10 @@ add_packet_config_cmd (const unsigned int which_packet, const char *name, } } -static enum packet_result +/* Check GDBserver's reply packet. Return packet_result + structure which contains the packet_status enum + and an error message for the PACKET_ERROR case. */ +static packet_result packet_check_result (const char *buf) { if (buf[0] != '\0') @@ -2429,41 +2465,46 @@ packet_check_result (const char *buf) && isxdigit (buf[1]) && isxdigit (buf[2]) && buf[3] == '\0') /* "Enn" - definitely an error. */ - return PACKET_ERROR; + return { PACKET_ERROR, buf + 1 }; /* Always treat "E." as an error. This will be used for more verbose error messages, such as E.memtypes. */ if (buf[0] == 'E' && buf[1] == '.') - return PACKET_ERROR; + { + if (buf[2] != '\0') + return { PACKET_ERROR, buf + 2 }; + else + return { PACKET_ERROR, "no error provided" }; + } /* The packet may or may not be OK. Just assume it is. */ - return PACKET_OK; + return packet_result (PACKET_OK); } else + { /* The stub does not support the packet. */ - return PACKET_UNKNOWN; + return packet_result (PACKET_UNKNOWN); + } } -static enum packet_result +static packet_result packet_check_result (const gdb::char_vector &buf) { return packet_check_result (buf.data ()); } -packet_result +packet_status remote_features::packet_ok (const char *buf, const int which_packet) { packet_config *config = &m_protocol_packets[which_packet]; packet_description *descr = &packets_descriptions[which_packet]; - enum packet_result result; - if (config->detect != AUTO_BOOLEAN_TRUE && config->support == PACKET_DISABLE) internal_error (_("packet_ok: attempt to use a disabled packet")); - result = packet_check_result (buf); - switch (result) + packet_result result = packet_check_result (buf); + switch (result.status ()) { case PACKET_OK: case PACKET_ERROR: @@ -2498,10 +2539,10 @@ remote_features::packet_ok (const char *buf, const int which_packet) break; } - return result; + return result.status (); } -packet_result +packet_status remote_features::packet_ok (const gdb::char_vector &buf, const int which_packet) { return packet_ok (buf.data (), which_packet); @@ -3000,7 +3041,7 @@ remote_target::set_syscall_catchpoint (int pid, bool needed, int any_count, gdb::array_view syscall_counts) { const char *catch_packet; - enum packet_result result; + enum packet_status result; int n_sysno = 0; if (m_features.packet_support (PACKET_QCatchSyscalls) == PACKET_DISABLE) @@ -8790,9 +8831,10 @@ remote_target::send_g_packet () xsnprintf (rs->buf.data (), get_remote_packet_size (), "g"); putpkt (rs->buf); getpkt (&rs->buf); - if (packet_check_result (rs->buf) == PACKET_ERROR) + packet_result result = packet_check_result (rs->buf); + if (result.status () == PACKET_ERROR) error (_("Could not read registers; remote failure reply '%s'"), - rs->buf.data ()); + result.err_msg ()); /* We can get out of synch in various cases. If the first character in the buffer is not a hex character, assume that has happened @@ -9098,9 +9140,10 @@ remote_target::store_registers_using_G (const struct regcache *regcache) bin2hex (regs, p, rsa->sizeof_g_packet); putpkt (rs->buf); getpkt (&rs->buf); - if (packet_check_result (rs->buf) == PACKET_ERROR) + packet_result pkt_status = packet_check_result (rs->buf); + if (pkt_status.status () == PACKET_ERROR) error (_("Could not write registers; remote failure reply '%s'"), - rs->buf.data ()); + pkt_status.err_msg ()); } /* Store register REGNUM, or all registers if REGNUM == -1, from the contents @@ -9682,7 +9725,7 @@ remote_target::remote_read_bytes (CORE_ADDR memaddr, FORMAT and the remaining arguments, then gets the reply. Returns whether the packet was a success, a failure, or unknown. */ -packet_result +packet_status remote_target::remote_send_printf (const char *format, ...) { struct remote_state *rs = get_remote_state (); @@ -9705,7 +9748,7 @@ remote_target::remote_send_printf (const char *format, ...) rs->buf[0] = '\0'; getpkt (&rs->buf); - return packet_check_result (rs->buf); + return packet_check_result (rs->buf).status (); } /* Flash writing can take quite some time. We'll set @@ -9717,7 +9760,7 @@ void remote_target::flash_erase (ULONGEST address, LONGEST length) { int addr_size = gdbarch_addr_bit (current_inferior ()->arch ()) / 8; - enum packet_result ret; + enum packet_status ret; scoped_restore restore_timeout = make_scoped_restore (&remote_timeout, remote_flash_timeout); @@ -11307,7 +11350,7 @@ remote_target::verify_memory (const gdb_byte *data, CORE_ADDR lma, ULONGEST size if (target_has_execution () && m_features.packet_support (PACKET_qCRC) != PACKET_DISABLE) { - enum packet_result result; + enum packet_status status; /* Make sure the remote is pointing at the right process. */ set_general_process (); @@ -11323,10 +11366,10 @@ remote_target::verify_memory (const gdb_byte *data, CORE_ADDR lma, ULONGEST size getpkt (&rs->buf); - result = m_features.packet_ok (rs->buf, PACKET_qCRC); - if (result == PACKET_ERROR) + status = m_features.packet_ok (rs->buf, PACKET_qCRC); + if (status == PACKET_ERROR) return -1; - else if (result == PACKET_OK) + else if (status == PACKET_OK) { for (target_crc = 0, tmp = &rs->buf[1]; *tmp; tmp++) target_crc = target_crc * 16 + fromhex (*tmp); @@ -12209,7 +12252,7 @@ remote_target::get_thread_local_address (ptid_t ptid, CORE_ADDR lm, struct remote_state *rs = get_remote_state (); char *p = rs->buf.data (); char *endp = p + get_remote_packet_size (); - enum packet_result result; + enum packet_status result; strcpy (p, "qGetTLSAddr:"); p += strlen (p); @@ -12255,7 +12298,7 @@ remote_target::get_tib_address (ptid_t ptid, CORE_ADDR *addr) struct remote_state *rs = get_remote_state (); char *p = rs->buf.data (); char *endp = p + get_remote_packet_size (); - enum packet_result result; + enum packet_status result; strcpy (p, "qGetTIBAddr:"); p += strlen (p); @@ -13820,7 +13863,7 @@ remote_target::get_trace_status (struct trace_status *ts) { /* Initialize it just to avoid a GCC false warning. */ char *p = NULL; - enum packet_result result; + enum packet_status result; struct remote_state *rs = get_remote_state (); if (m_features.packet_support (PACKET_qTStatus) == PACKET_DISABLE) @@ -14200,7 +14243,7 @@ remote_target::set_trace_buffer_size (LONGEST val) struct remote_state *rs = get_remote_state (); char *buf = rs->buf.data (); char *endbuf = buf + get_remote_packet_size (); - enum packet_result result; + enum packet_status result; gdb_assert (val >= 0 || val == -1); buf += xsnprintf (buf, endbuf - buf, "QTBuffer:size:"); @@ -15528,7 +15571,7 @@ remote_target::store_memtags (CORE_ADDR address, size_t len, getpkt (&rs->buf); /* Verify if the request was successful. */ - return packet_check_result (rs->buf.data ()) == PACKET_OK; + return packet_check_result (rs->buf).status () == PACKET_OK; } /* Return true if remote target T is non-stop. */ @@ -15625,6 +15668,31 @@ test_memory_tagging_functions () expected.length ()) == 0); } +static void +test_packet_check_result () +{ + std::string buf = "E.msg"; + packet_result result = packet_check_result (buf.data ()); + + SELF_CHECK (result.status () == PACKET_ERROR); + SELF_CHECK (strcmp(result.err_msg (), "msg") == 0); + + result = packet_check_result ("E01"); + SELF_CHECK (result.status () == PACKET_ERROR); + SELF_CHECK (strcmp(result.err_msg (), "01") == 0); + + SELF_CHECK (packet_check_result ("E1").status () == PACKET_OK); + + SELF_CHECK (packet_check_result ("E000").status () == PACKET_OK); + + result = packet_check_result ("E."); + SELF_CHECK (result.status () == PACKET_ERROR); + SELF_CHECK (strcmp(result.err_msg (), "no error provided") == 0); + + SELF_CHECK (packet_check_result ("some response").status () == PACKET_OK); + + SELF_CHECK (packet_check_result ("").status () == PACKET_UNKNOWN); +} } // namespace selftests #endif /* GDB_SELF_TEST */ @@ -16124,5 +16192,7 @@ from the target."), #if GDB_SELF_TEST selftests::register_test ("remote_memory_tagging", selftests::test_memory_tagging_functions); + selftests::register_test ("packet_check_result", + selftests::test_packet_check_result); #endif }