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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1730932694792116600 Content-Type: text/plain; charset="utf-8" Allow debugging individual processes in multi-process applications by starting them with export QEMU_GDB=3D/tmp/qemu-%d.sock,suspend=3Dn. Currently one would have to attach to every process to ensure the app makes progress. In case suspend=3Dn is not specified, the flow remains unchanged. If it is specified, then accepting the client connection is delegated to a thread. In the future this machinery may be reused for handling reconnections and interruptions. On accepting a connection, the thread schedules gdb_handlesig() on the first CPU and wakes it up with host_interrupt_signal. Note that the result of this gdb_handlesig() invocation is handled, as opposed to many other existing call sites. These other call sites probably need to be fixed separately. Signed-off-by: Ilya Leoshkevich --- bsd-user/main.c | 1 - gdbstub/user.c | 120 ++++++++++++++++++++++++++++++++++++++++++---- linux-user/main.c | 1 - 3 files changed, 110 insertions(+), 12 deletions(-) diff --git a/bsd-user/main.c b/bsd-user/main.c index 61ca73c4781..ca4773a3f40 100644 --- a/bsd-user/main.c +++ b/bsd-user/main.c @@ -628,7 +628,6 @@ int main(int argc, char **argv) =20 if (gdbstub) { gdbserver_start(gdbstub); - gdb_handlesig(cpu, 0, NULL, NULL, 0); } cpu_loop(env); /* never exits */ diff --git a/gdbstub/user.c b/gdbstub/user.c index c900d0a52fe..6ada0d687b9 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -10,6 +10,7 @@ */ =20 #include "qemu/osdep.h" +#include #include "qemu/bitops.h" #include "qemu/cutils.h" #include "qemu/sockets.h" @@ -21,6 +22,7 @@ #include "gdbstub/user.h" #include "gdbstub/enums.h" #include "hw/core/cpu.h" +#include "user/signal.h" #include "trace.h" #include "internals.h" =20 @@ -416,11 +418,101 @@ static int gdbserver_open_port(int port) return fd; } =20 -int gdbserver_start(const char *port_or_path) +static bool gdbserver_accept(int port, int gdb_fd, const char *port_or_pat= h) { - int port =3D g_ascii_strtoull(port_or_path, NULL, 10); + bool ret; + + if (port > 0) { + ret =3D gdb_accept_tcp(gdb_fd); + } else { + ret =3D gdb_accept_socket(gdb_fd); + if (ret) { + gdbserver_user_state.socket_path =3D g_strdup(port_or_path); + } + } + + if (!ret) { + close(gdb_fd); + } + + return ret; +} + +struct { + int port; int gdb_fd; + char *port_or_path; +} gdbserver_args; + +static void do_gdb_handlesig(CPUState *cs, run_on_cpu_data arg) +{ + int sig; + + sig =3D target_to_host_signal(gdb_handlesig(cs, 0, NULL, NULL, 0)); + if (sig >=3D 1 && sig < NSIG) { + qemu_kill_thread(gdb_get_cpu_index(cs), sig); + } +} + +static void *gdbserver_accept_thread(void *arg) +{ + if (gdbserver_accept(gdbserver_args.port, gdbserver_args.gdb_fd, + gdbserver_args.port_or_path)) { + CPUState *cs =3D first_cpu; + + async_safe_run_on_cpu(cs, do_gdb_handlesig, RUN_ON_CPU_NULL); + qemu_kill_thread(gdb_get_cpu_index(cs), host_interrupt_signal); + } + + g_free(gdbserver_args.port_or_path); + + return NULL; +} + +__attribute__((__format__(__printf__, 1, 2))) +static void print_usage(const char *format, ...) +{ + va_list ap; + + va_start(ap, format); + vfprintf(stderr, format, ap); + va_end(ap); + fprintf(stderr, "Usage: -g {port|path}[,suspend=3D{y|n}]\n"); +} + +#define SUSPEND "suspend=3D" + +int gdbserver_start(const char *args) +{ + g_auto(GStrv) argv =3D g_strsplit(args, ",", 0); + const char *port_or_path =3D NULL; + bool suspend =3D true; + int gdb_fd, port; + GStrv arg; =20 + for (arg =3D argv; *arg; arg++) { + if (g_str_has_prefix(*arg, SUSPEND)) { + const char *val =3D *arg + strlen(SUSPEND); + + suspend =3D (strcmp(val, "y") =3D=3D 0); + if (!suspend && (strcmp(val, "n") !=3D 0)) { + print_usage("Bad option value: %s", *arg); + return -1; + } + } else { + if (port_or_path) { + print_usage("Unknown option: %s", *arg); + return -1; + } + port_or_path =3D *arg; + } + } + if (!port_or_path) { + print_usage("Port or path not specified"); + return -1; + } + + port =3D g_ascii_strtoull(port_or_path, NULL, 10); if (port > 0) { gdb_fd =3D gdbserver_open_port(port); } else { @@ -431,16 +523,24 @@ int gdbserver_start(const char *port_or_path) return -1; } =20 - if (port > 0 && gdb_accept_tcp(gdb_fd)) { - return 0; - } else if (gdb_accept_socket(gdb_fd)) { - gdbserver_user_state.socket_path =3D g_strdup(port_or_path); + if (suspend) { + if (gdbserver_accept(port, gdb_fd, port_or_path)) { + gdb_handlesig(first_cpu, 0, NULL, NULL, 0); + return 0; + } else { + return -1; + } + } else { + QemuThread thread; + + gdbserver_args.port =3D port; + gdbserver_args.gdb_fd =3D gdb_fd; + gdbserver_args.port_or_path =3D g_strdup(port_or_path); + qemu_thread_create(&thread, "gdb-accept", + &gdbserver_accept_thread, NULL, + QEMU_THREAD_DETACHED); return 0; } - - /* gone wrong */ - close(gdb_fd); - return -1; } =20 void gdbserver_fork_start(void) diff --git a/linux-user/main.c b/linux-user/main.c index b09af8d4365..97245ab37c2 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -1027,7 +1027,6 @@ int main(int argc, char **argv, char **envp) gdbstub); exit(EXIT_FAILURE); } - gdb_handlesig(cpu, 0, NULL, NULL, 0); } =20 #ifdef CONFIG_SEMIHOSTING --=20 2.47.0