From nobody Wed Nov 5 18:21:35 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 15358062174471006.8719334797851; Sat, 1 Sep 2018 05:50:17 -0700 (PDT) Received: from localhost ([::1]:37044 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw5Lt-0007pn-Dg for importer@patchew.org; Sat, 01 Sep 2018 08:50:09 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35525) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw5JE-0004wq-WD for qemu-devel@nongnu.org; Sat, 01 Sep 2018 08:47:26 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fw5JD-0007p9-9o for qemu-devel@nongnu.org; Sat, 01 Sep 2018 08:47:24 -0400 Received: from greensocs.com ([193.104.36.180]:40588) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fw5J5-0007hR-Ls; Sat, 01 Sep 2018 08:47:16 -0400 Received: from localhost (localhost [127.0.0.1]) by greensocs.com (Postfix) with ESMTP id 907B3521ABA; Sat, 1 Sep 2018 14:47:06 +0200 (CEST) Received: from greensocs.com ([127.0.0.1]) by localhost (gs-01.greensocs.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Io8QM9d6O92H; Sat, 1 Sep 2018 14:47:05 +0200 (CEST) Received: by greensocs.com (Postfix, from userid 998) id A6644521A9F; Sat, 1 Sep 2018 14:47:05 +0200 (CEST) Received: from michell-laptop.home.lmichel.fr (LFbn-LYO-1-488-36.w2-7.abo.wanadoo.fr [2.7.77.36]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: luc.michel@greensocs.com) by greensocs.com (Postfix) with ESMTPSA id F3DF8521AB0; Sat, 1 Sep 2018 14:47:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1535806026; bh=EP9OAu1dvp26opCYuwAgh8bOW65TUfqskncyeeJ9KUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ePMOPlCyFyvkMmimtfEnYHAboKPBDKy2Ab4C3Mg2b6ifDx+DzmsDNm4ueLAkq+mle d6ZNFx2vkC6E1qoYBbG+upD4DkJ8LxS7BJvCIfx3eAoIkC/Qr9tXad7IETkMph4fz6 t+rF81CRHVwbdZQdyfd5jp/pA0yBkAXuSMM59D3k= X-Virus-Scanned: amavisd-new at greensocs.com Authentication-Results: gs-01.greensocs.com (amavisd-new); dkim=pass (1024-bit key) header.d=greensocs.com header.b=d4c3Ecvr; dkim=pass (1024-bit key) header.d=greensocs.com header.b=d4c3Ecvr DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1535806025; bh=EP9OAu1dvp26opCYuwAgh8bOW65TUfqskncyeeJ9KUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=d4c3EcvrWPm67ASwBwXVa4y2OZFaT1QqAMij6RO2E4lEaQEEZhwBQ/LAgBpnHX2o/ B/YAhTIU3iCeAByEGWSuJjI+4NlRKWyic6ohwNy2HYgwzlzjOrzBgehTlVOFge8hmA SuMH/8wjhwYdRA3/znRCKVs8w0JtxRg2tnv/G4hk= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=greensocs.com; s=mail; t=1535806025; bh=EP9OAu1dvp26opCYuwAgh8bOW65TUfqskncyeeJ9KUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=d4c3EcvrWPm67ASwBwXVa4y2OZFaT1QqAMij6RO2E4lEaQEEZhwBQ/LAgBpnHX2o/ B/YAhTIU3iCeAByEGWSuJjI+4NlRKWyic6ohwNy2HYgwzlzjOrzBgehTlVOFge8hmA SuMH/8wjhwYdRA3/znRCKVs8w0JtxRg2tnv/G4hk= From: Luc Michel To: qemu-devel@nongnu.org Date: Sat, 1 Sep 2018 14:46:27 +0200 Message-Id: <20180901124639.19735-4-luc.michel@greensocs.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180901124639.19735-1-luc.michel@greensocs.com> References: <20180901124639.19735-1-luc.michel@greensocs.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 193.104.36.180 Subject: [Qemu-devel] [PATCH 03/15] gdbstub: add multiprocess support to 'H' and 'T' packets X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , alistair@alistair23.me, mark.burton@greensocs.com, saipava@xilinx.com, edgari@xilinx.com, qemu-arm@nongnu.org, Luc Michel Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (found 2 invalid signatures) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Add a couple of helper functions to cope with GDB threads and processes. The gdb_get_process() function looks for a process given a pid. The gdb_get_cpu() function returns the CPU corresponding to the (pid, tid) pair given as parameters. The read_thread_id() function parses the thread-id sent by the peer. This function supports the multiprocess extension thread-id syntax. The return value specifies if the parsing failed, or if a special case was encountered (all processes or all threads). Use them in 'H' and 'T' packets handling to support the multiprocess extension. Signed-off-by: Luc Michel --- gdbstub.c | 149 +++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 131 insertions(+), 18 deletions(-) diff --git a/gdbstub.c b/gdbstub.c index ec3105dbc1..33fa1b9c5f 100644 --- a/gdbstub.c +++ b/gdbstub.c @@ -667,10 +667,74 @@ static uint32_t gdb_get_cpu_pid(const GDBState *s, CP= UState *cpu) } =20 return pid + 1; } =20 +static GDBProcess *gdb_get_process(const GDBState *s, uint32_t pid) +{ + uint32_t process_idx; + + if (!pid) { + /* 0 means any process, we take the first one */ + pid =3D 1; + } + + /* GDB PIDs are in the range [1;n] */ + process_idx =3D pid - 1; + + if (process_idx >=3D s->process_num) { + return NULL; + } + + return &s->processes[process_idx]; +} + +static GDBProcess *gdb_get_cpu_process(const GDBState *s, CPUState *cpu) +{ + return gdb_get_process(s, gdb_get_cpu_pid(s, cpu)); +} + +static CPUState *find_cpu(uint32_t thread_id) +{ + CPUState *cpu; + + CPU_FOREACH(cpu) { + if (cpu_gdb_index(cpu) =3D=3D thread_id) { + return cpu; + } + } + + return NULL; +} + +static CPUState *gdb_get_cpu(const GDBState *s, uint32_t pid, uint32_t tid) +{ + GDBProcess *process; + CPUState *cpu =3D find_cpu(tid); + + if (!tid) { + /* 0 means any thread, we take the first one */ + tid =3D 1; + } + + if (cpu =3D=3D NULL) { + return NULL; + } + + process =3D gdb_get_cpu_process(s, cpu); + + if (process->pid !=3D pid) { + return NULL; + } + + if (!process->attached) { + return NULL; + } + + return cpu; +} + static const char *get_feature_xml(const char *p, const char **newp, CPUClass *cc) { size_t len; int i; @@ -923,23 +987,10 @@ static void gdb_set_cpu_pc(GDBState *s, target_ulong = pc) =20 cpu_synchronize_state(cpu); cpu_set_pc(cpu, pc); } =20 -static CPUState *find_cpu(uint32_t thread_id) -{ - CPUState *cpu; - - CPU_FOREACH(cpu) { - if (cpu_gdb_index(cpu) =3D=3D thread_id) { - return cpu; - } - } - - return NULL; -} - static char *get_thread_id(const GDBState *s, CPUState *cpu, char *buf, size_t buf_size) { if (s->multiprocess) { snprintf(buf, buf_size, "p%02x.%02x", @@ -950,10 +1001,64 @@ static char *get_thread_id(const GDBState *s, CPUSta= te *cpu, } =20 return buf; } =20 +typedef enum GDBThreadIdKind { + GDB_ONE_THREAD =3D 0, + GDB_ALL_THREADS, /* One process, all threads */ + GDB_ALL_PROCESSES, + GDB_READ_THREAD_ERR +} GDBThreadIdKind; + +static GDBThreadIdKind read_thread_id(const char *buf, const char **end_bu= f, + uint32_t *pid, uint32_t *tid) +{ + unsigned long p, t; + int ret; + + if (*buf =3D=3D 'p') { + buf++; + ret =3D qemu_strtoul(buf, &buf, 16, &p); + + if (ret) { + return GDB_READ_THREAD_ERR; + } + + /* Skip '.' */ + buf++; + } else { + p =3D 1; + } + + ret =3D qemu_strtoul(buf, &buf, 16, &t); + + if (ret) { + return GDB_READ_THREAD_ERR; + } + + *end_buf =3D buf; + + if (p =3D=3D -1) { + return GDB_ALL_PROCESSES; + } + + if (pid) { + *pid =3D p; + } + + if (t =3D=3D -1) { + return GDB_ALL_THREADS; + } + + if (tid) { + *tid =3D t; + } + + return GDB_ONE_THREAD; +} + static int is_query_packet(const char *p, const char *query, char separato= r) { unsigned int query_len =3D strlen(query); =20 return strncmp(p, query, query_len) =3D=3D 0 && @@ -1058,16 +1163,18 @@ static int gdb_handle_packet(GDBState *s, const cha= r *line_buf) { CPUState *cpu; CPUClass *cc; const char *p; uint32_t thread; + uint32_t pid, tid; int ch, reg_size, type, res; uint8_t mem_buf[MAX_PACKET_LENGTH]; char buf[sizeof(mem_buf) + 1 /* trailing NUL */]; char thread_id[16]; uint8_t *registers; target_ulong addr, len; + GDBThreadIdKind thread_kind; =20 trace_gdbstub_io_command(line_buf); =20 p =3D line_buf; ch =3D *p++; @@ -1271,16 +1378,22 @@ static int gdb_handle_packet(GDBState *s, const cha= r *line_buf) else put_packet(s, "E22"); break; case 'H': type =3D *p++; - thread =3D strtoull(p, (char **)&p, 16); - if (thread =3D=3D -1 || thread =3D=3D 0) { + + thread_kind =3D read_thread_id(p, &p, &pid, &tid); + if (thread_kind =3D=3D GDB_READ_THREAD_ERR) { + put_packet(s, "E22"); + break; + } + + if (thread_kind !=3D GDB_ONE_THREAD) { put_packet(s, "OK"); break; } - cpu =3D find_cpu(thread); + cpu =3D gdb_get_cpu(s, pid, tid); if (cpu =3D=3D NULL) { put_packet(s, "E22"); break; } switch (type) { @@ -1296,12 +1409,12 @@ static int gdb_handle_packet(GDBState *s, const cha= r *line_buf) put_packet(s, "E22"); break; } break; case 'T': - thread =3D strtoull(p, (char **)&p, 16); - cpu =3D find_cpu(thread); + read_thread_id(p, &p, &pid, &tid); + cpu =3D gdb_get_cpu(s, pid, tid); =20 if (cpu !=3D NULL) { put_packet(s, "OK"); } else { put_packet(s, "E22"); --=20 2.18.0