This started as a clean-up to properly pass a Error handler to the gdbserver_start so we could do the right thing for command line and HMP invocations.
Now that we have cleaned up foreach_device_config_or_exit() in earlier patches we can further simplify by it by passing &error_fatal instead of checking the return value. Having a return value is still useful for HMP though so tweak the return to use a simple bool instead. Message-Id: <20250109170619.2271193-11-alex.ben...@linaro.org> Reviewed-by: Pierrick Bouvier <pierrick.bouv...@linaro.org> Signed-off-by: Alex Bennée <alex.ben...@linaro.org> Acked-by: Ilya Leoshkevich <i...@linux.ibm.com> --- v2 - split some work into pre-cursor patches v3 - fix bsd build - don't return false from gdbserver_open_port - use error_setg_errno instead of perror - split long line --- include/exec/gdbstub.h | 8 +++++- bsd-user/main.c | 2 +- gdbstub/system.c | 22 +++++++++------- gdbstub/user.c | 22 +++++++++------- linux-user/main.c | 6 +---- monitor/hmp-cmds.c | 2 +- system/vl.c | 59 ++++++++++++++++++++---------------------- 7 files changed, 62 insertions(+), 59 deletions(-) diff --git a/include/exec/gdbstub.h b/include/exec/gdbstub.h index d73f424f56..0675b0b646 100644 --- a/include/exec/gdbstub.h +++ b/include/exec/gdbstub.h @@ -49,12 +49,18 @@ void gdb_unregister_coprocessor_all(CPUState *cpu); /** * gdbserver_start: start the gdb server * @port_or_device: connection spec for gdb + * @errp: error handle * * For CONFIG_USER this is either a tcp port or a path to a fifo. For * system emulation you can use a full chardev spec for your gdbserver * port. + * + * The error handle should be either &error_fatal (for start-up) or + * &error_warn (for QMP/HMP initiated sessions). + * + * Returns true when server successfully started. */ -int gdbserver_start(const char *port_or_device); +bool gdbserver_start(const char *port_or_device, Error **errp); /** * gdb_feature_builder_init() - Initialize GDBFeatureBuilder. diff --git a/bsd-user/main.c b/bsd-user/main.c index 0a5bc57836..b2f6a9be2f 100644 --- a/bsd-user/main.c +++ b/bsd-user/main.c @@ -628,7 +628,7 @@ int main(int argc, char **argv) target_cpu_init(env, regs); if (gdbstub) { - gdbserver_start(gdbstub); + gdbserver_start(gdbstub, &error_fatal); gdb_handlesig(cpu, 0, NULL, NULL, 0); } cpu_loop(env); diff --git a/gdbstub/system.c b/gdbstub/system.c index 2d9fdff2fe..8ce79fa88c 100644 --- a/gdbstub/system.c +++ b/gdbstub/system.c @@ -330,26 +330,27 @@ static void create_processes(GDBState *s) gdb_create_default_process(s); } -int gdbserver_start(const char *device) +bool gdbserver_start(const char *device, Error **errp) { Chardev *chr = NULL; Chardev *mon_chr; g_autoptr(GString) cs = g_string_new(device); if (!first_cpu) { - error_report("gdbstub: meaningless to attach gdb to a " - "machine without any CPU."); - return -1; + error_setg(errp, "gdbstub: meaningless to attach gdb to a " + "machine without any CPU."); + return false; } if (!gdb_supports_guest_debug()) { - error_report("gdbstub: current accelerator doesn't " - "support guest debugging"); - return -1; + error_setg(errp, "gdbstub: current accelerator doesn't " + "support guest debugging"); + return false; } if (cs->len == 0) { - return -1; + error_setg(errp, "gdbstub: missing connection string"); + return false; } trace_gdbstub_op_start(cs->str); @@ -374,7 +375,8 @@ int gdbserver_start(const char *device) */ chr = qemu_chr_new_noreplay("gdb", cs->str, true, NULL); if (!chr) { - return -1; + error_setg(errp, "gdbstub: couldn't create chardev"); + return false; } } @@ -406,7 +408,7 @@ int gdbserver_start(const char *device) gdbserver_system_state.mon_chr = mon_chr; gdb_syscall_reset(); - return 0; + return true; } static void register_types(void) diff --git a/gdbstub/user.c b/gdbstub/user.c index 0b4bfa9c48..c2bdfc3d49 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -13,6 +13,7 @@ #include "qemu/bitops.h" #include "qemu/cutils.h" #include "qemu/sockets.h" +#include "qapi/error.h" #include "exec/hwaddr.h" #include "exec/tb-flush.h" #include "exec/gdbstub.h" @@ -372,14 +373,14 @@ static bool gdb_accept_tcp(int gdb_fd) return true; } -static int gdbserver_open_port(int port) +static int gdbserver_open_port(int port, Error **errp) { struct sockaddr_in sockaddr; int fd, ret; fd = socket(PF_INET, SOCK_STREAM, 0); if (fd < 0) { - perror("socket"); + error_setg_errno(errp, errno, "Failed to create socket"); return -1; } qemu_set_cloexec(fd); @@ -391,13 +392,13 @@ static int gdbserver_open_port(int port) sockaddr.sin_addr.s_addr = 0; ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); if (ret < 0) { - perror("bind"); + error_setg_errno(errp, errno, "Failed to bind socket"); close(fd); return -1; } ret = listen(fd, 1); if (ret < 0) { - perror("listen"); + error_setg_errno(errp, errno, "Failed to listen to socket"); close(fd); return -1; } @@ -405,31 +406,32 @@ static int gdbserver_open_port(int port) return fd; } -int gdbserver_start(const char *port_or_path) +bool gdbserver_start(const char *port_or_path, Error **errp) { int port = g_ascii_strtoull(port_or_path, NULL, 10); int gdb_fd; if (port > 0) { - gdb_fd = gdbserver_open_port(port); + gdb_fd = gdbserver_open_port(port, errp); } else { gdb_fd = gdbserver_open_socket(port_or_path); } if (gdb_fd < 0) { - return -1; + return false; } if (port > 0 && gdb_accept_tcp(gdb_fd)) { - return 0; + return true; } else if (gdb_accept_socket(gdb_fd)) { gdbserver_user_state.socket_path = g_strdup(port_or_path); - return 0; + return true; } /* gone wrong */ close(gdb_fd); - return -1; + error_setg(errp, "gdbstub: failed to accept connection"); + return false; } void gdbserver_fork_start(void) diff --git a/linux-user/main.c b/linux-user/main.c index b97634a32d..7198fa0986 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -1023,11 +1023,7 @@ int main(int argc, char **argv, char **envp) target_cpu_copy_regs(env, regs); if (gdbstub) { - if (gdbserver_start(gdbstub) < 0) { - fprintf(stderr, "qemu: could not open gdbserver on %s\n", - gdbstub); - exit(EXIT_FAILURE); - } + gdbserver_start(gdbstub, &error_fatal); gdb_handlesig(cpu, 0, NULL, NULL, 0); } diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c index 80b2e5ff9f..0aa22e1ae2 100644 --- a/monitor/hmp-cmds.c +++ b/monitor/hmp-cmds.c @@ -285,7 +285,7 @@ void hmp_gdbserver(Monitor *mon, const QDict *qdict) device = "tcp::" DEFAULT_GDBSTUB_PORT; } - if (gdbserver_start(device) < 0) { + if (!gdbserver_start(device, &error_warn)) { monitor_printf(mon, "Could not open gdbserver on device '%s'\n", device); } else if (strcmp(device, "none") == 0) { diff --git a/system/vl.c b/system/vl.c index 02795c5135..c567826718 100644 --- a/system/vl.c +++ b/system/vl.c @@ -811,15 +811,15 @@ static void configure_msg(QemuOpts *opts) /***********************************************************/ /* USB devices */ -static int usb_parse(const char *cmdline) +static bool usb_parse(const char *cmdline, Error **errp) { g_assert(machine_usb(current_machine)); if (!usbdevice_create(cmdline)) { - error_report("could not add USB device '%s'", cmdline); - return -1; + error_setg(errp, "could not add USB device '%s'", cmdline); + return false; } - return 0; + return true; } /***********************************************************/ @@ -1298,24 +1298,21 @@ static void add_device_config(int type, const char *cmdline) * @type: device_config type * @func: device specific config function, returning pass/fail * - * Any failure is fatal and we exit with an error message. + * @func is called with the &error_fatal handler so device specific + * error messages can be reported on failure. */ static void foreach_device_config_or_exit(int type, - int (*func)(const char *cmdline)) + bool (*func)(const char *cmdline, + Error **errp)) { struct device_config *conf; - int rc; QTAILQ_FOREACH(conf, &device_configs, next) { if (conf->type != type) continue; loc_push_restore(&conf->loc); - rc = func(conf->cmdline); + func(conf->cmdline, &error_fatal); loc_pop(&conf->loc); - if (rc) { - error_setg(&error_fatal, "failed to configure: %s", conf->cmdline); - exit(1); - } } } @@ -1446,7 +1443,7 @@ static void qemu_create_default_devices(void) } } -static int serial_parse(const char *devname) +static bool serial_parse(const char *devname, Error **errp) { int index = num_serial_hds; @@ -1461,13 +1458,13 @@ static int serial_parse(const char *devname) serial_hds[index] = qemu_chr_new_mux_mon(label, devname, NULL); if (!serial_hds[index]) { - error_report("could not connect serial device" - " to character backend '%s'", devname); - return -1; + error_setg(errp, "could not connect serial device" + " to character backend '%s'", devname); + return false; } } num_serial_hds++; - return 0; + return true; } Chardev *serial_hd(int i) @@ -1479,44 +1476,44 @@ Chardev *serial_hd(int i) return NULL; } -static int parallel_parse(const char *devname) +static bool parallel_parse(const char *devname, Error **errp) { static int index = 0; char label[32]; if (strcmp(devname, "none") == 0) - return 0; + return true; if (index == MAX_PARALLEL_PORTS) { - error_report("too many parallel ports"); - exit(1); + error_setg(errp, "too many parallel ports"); + return false; } snprintf(label, sizeof(label), "parallel%d", index); parallel_hds[index] = qemu_chr_new_mux_mon(label, devname, NULL); if (!parallel_hds[index]) { - error_report("could not connect parallel device" - " to character backend '%s'", devname); - return -1; + error_setg(errp, "could not connect parallel device" + " to character backend '%s'", devname); + return false; } index++; - return 0; + return true; } -static int debugcon_parse(const char *devname) +static bool debugcon_parse(const char *devname, Error **errp) { QemuOpts *opts; if (!qemu_chr_new_mux_mon("debugcon", devname, NULL)) { - error_report("invalid character backend '%s'", devname); - exit(1); + error_setg(errp, "invalid character backend '%s'", devname); + return false; } opts = qemu_opts_create(qemu_find_opts("device"), "debugcon", 1, NULL); if (!opts) { - error_report("already have a debugcon device"); - exit(1); + error_setg(errp, "already have a debugcon device"); + return false; } qemu_opt_set(opts, "driver", "isa-debugcon", &error_abort); qemu_opt_set(opts, "chardev", "debugcon", &error_abort); - return 0; + return true; } static gint machine_class_cmp(gconstpointer a, gconstpointer b) -- 2.39.5