diff options
Diffstat (limited to 'gdbstub')
-rw-r--r-- | gdbstub/gdbstub.c | 72 | ||||
-rw-r--r-- | gdbstub/meson.build | 38 | ||||
-rw-r--r-- | gdbstub/syscalls.c | 4 | ||||
-rw-r--r-- | gdbstub/system.c | 45 | ||||
-rw-r--r-- | gdbstub/user-target.c | 18 | ||||
-rw-r--r-- | gdbstub/user.c | 173 |
6 files changed, 218 insertions, 132 deletions
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c index d08568c..dd5fb56 100644 --- a/gdbstub/gdbstub.c +++ b/gdbstub/gdbstub.c @@ -20,7 +20,7 @@ * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, see <http://www.gnu.org/licenses/>. * - * SPDX-License-Identifier: LGPL-2.0+ + * SPDX-License-Identifier: LGPL-2.0-or-later */ #include "qemu/osdep.h" @@ -28,6 +28,7 @@ #include "qemu/cutils.h" #include "qemu/module.h" #include "qemu/error-report.h" +#include "qemu/target-info.h" #include "trace.h" #include "exec/gdbstub.h" #include "gdbstub/commands.h" @@ -41,8 +42,8 @@ #endif #include "hw/core/cpu.h" -#include "sysemu/hw_accel.h" -#include "sysemu/runstate.h" +#include "system/hw_accel.h" +#include "system/runstate.h" #include "exec/replay-core.h" #include "exec/hwaddr.h" @@ -354,7 +355,6 @@ static const char *get_feature_xml(const char *p, const char **newp, GDBProcess *process) { CPUState *cpu = gdb_get_first_cpu_in_process(process); - CPUClass *cc = CPU_GET_CLASS(cpu); GDBRegisterState *r; size_t len; @@ -377,11 +377,11 @@ static const char *get_feature_xml(const char *p, const char **newp, "<!DOCTYPE target SYSTEM \"gdb-target.dtd\">" "<target>")); - if (cc->gdb_arch_name) { + if (cpu->cc->gdb_arch_name) { g_ptr_array_add( xml, g_markup_printf_escaped("<architecture>%s</architecture>", - cc->gdb_arch_name(cpu))); + cpu->cc->gdb_arch_name(cpu))); } for (guint i = 0; i < cpu->gdb_regs->len; i++) { r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i); @@ -520,11 +520,10 @@ GArray *gdb_get_register_list(CPUState *cpu) int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) { - CPUClass *cc = CPU_GET_CLASS(cpu); GDBRegisterState *r; - if (reg < cc->gdb_num_core_regs) { - return cc->gdb_read_register(cpu, buf, reg); + if (reg < cpu->cc->gdb_num_core_regs) { + return cpu->cc->gdb_read_register(cpu, buf, reg); } for (guint i = 0; i < cpu->gdb_regs->len; i++) { @@ -536,13 +535,12 @@ int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) return 0; } -static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) +int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg) { - CPUClass *cc = CPU_GET_CLASS(cpu); GDBRegisterState *r; - if (reg < cc->gdb_num_core_regs) { - return cc->gdb_write_register(cpu, mem_buf, reg); + if (reg < cpu->cc->gdb_num_core_regs) { + return cpu->cc->gdb_write_register(cpu, mem_buf, reg); } for (guint i = 0; i < cpu->gdb_regs->len; i++) { @@ -568,15 +566,30 @@ static void gdb_register_feature(CPUState *cpu, int base_reg, g_array_append_val(cpu->gdb_regs, s); } +static const char *gdb_get_core_xml_file(CPUState *cpu) +{ + CPUClass *cc = cpu->cc; + + /* + * The CPU class can provide the XML filename via a method, + * or as a simple fixed string field. + */ + if (cc->gdb_get_core_xml_file) { + return cc->gdb_get_core_xml_file(cpu); + } + return cc->gdb_core_xml_file; +} + void gdb_init_cpu(CPUState *cpu) { - CPUClass *cc = CPU_GET_CLASS(cpu); + CPUClass *cc = cpu->cc; const GDBFeature *feature; + const char *xmlfile = gdb_get_core_xml_file(cpu); cpu->gdb_regs = g_array_new(false, false, sizeof(GDBRegisterState)); - if (cc->gdb_core_xml_file) { - feature = gdb_find_static_feature(cc->gdb_core_xml_file); + if (xmlfile) { + feature = gdb_find_static_feature(xmlfile); gdb_register_feature(cpu, 0, cc->gdb_read_register, cc->gdb_write_register, feature); @@ -1331,8 +1344,8 @@ static void handle_read_all_regs(GArray *params, void *user_ctx) len += gdb_read_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf, reg_id); + g_assert(len == gdbserver_state.mem_buf->len); } - g_assert(len == gdbserver_state.mem_buf->len); gdb_memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len); gdb_put_strbuf(); @@ -1585,6 +1598,18 @@ static void handle_query_threads(GArray *params, void *user_ctx) gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu); } +static void handle_query_gdb_server_version(GArray *params, void *user_ctx) +{ +#if defined(CONFIG_USER_ONLY) + g_string_printf(gdbserver_state.str_buf, "name:qemu-%s;version:%s;", + target_name(), QEMU_VERSION); +#else + g_string_printf(gdbserver_state.str_buf, "name:qemu-system-%s;version:%s;", + target_name(), QEMU_VERSION); +#endif + gdb_put_strbuf(); +} + static void handle_query_first_threads(GArray *params, void *user_ctx) { gdbserver_state.query_cpu = gdb_first_attached_cpu(); @@ -1646,11 +1671,8 @@ void gdb_extend_qsupported_features(char *qflags) static void handle_query_supported(GArray *params, void *user_ctx) { - CPUClass *cc; - g_string_printf(gdbserver_state.str_buf, "PacketSize=%x", MAX_PACKET_LENGTH); - cc = CPU_GET_CLASS(first_cpu); - if (cc->gdb_core_xml_file) { + if (gdb_get_core_xml_file(first_cpu)) { g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+"); } @@ -1697,7 +1719,6 @@ static void handle_query_supported(GArray *params, void *user_ctx) static void handle_query_xfer_features(GArray *params, void *user_ctx) { GDBProcess *process; - CPUClass *cc; unsigned long len, total_len, addr; const char *xml; const char *p; @@ -1708,8 +1729,7 @@ static void handle_query_xfer_features(GArray *params, void *user_ctx) } process = gdb_get_cpu_process(gdbserver_state.g_cpu); - cc = CPU_GET_CLASS(gdbserver_state.g_cpu); - if (!cc->gdb_core_xml_file) { + if (!gdb_get_core_xml_file(gdbserver_state.g_cpu)) { gdb_put_packet(""); return; } @@ -1836,6 +1856,10 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = { .cmd = "sThreadInfo", }, { + .handler = handle_query_gdb_server_version, + .cmd = "GDBServerVersion", + }, + { .handler = handle_query_first_threads, .cmd = "fThreadInfo", }, diff --git a/gdbstub/meson.build b/gdbstub/meson.build index dff741d..15c666f 100644 --- a/gdbstub/meson.build +++ b/gdbstub/meson.build @@ -4,34 +4,18 @@ # types such as hwaddr. # -# We need to build the core gdb code via a library to be able to tweak -# cflags so: - -gdb_user_ss = ss.source_set() -gdb_system_ss = ss.source_set() - # We build two versions of gdbstub, one for each mode -gdb_user_ss.add(files('gdbstub.c', 'user.c')) -gdb_system_ss.add(files('gdbstub.c', 'system.c')) - -gdb_user_ss = gdb_user_ss.apply({}) -gdb_system_ss = gdb_system_ss.apply({}) - -libgdb_user = static_library('gdb_user', - gdb_user_ss.sources() + genh, - c_args: '-DCONFIG_USER_ONLY', - build_by_default: false) - -libgdb_system = static_library('gdb_system', - gdb_system_ss.sources() + genh, - build_by_default: false) - -gdb_user = declare_dependency(objects: libgdb_user.extract_all_objects(recursive: false)) -user_ss.add(gdb_user) -gdb_system = declare_dependency(objects: libgdb_system.extract_all_objects(recursive: false)) -system_ss.add(gdb_system) - -common_ss.add(files('syscalls.c')) +user_ss.add(files( + 'gdbstub.c', + 'syscalls.c', + 'user.c' +)) + +system_ss.add(files( + 'gdbstub.c', + 'syscalls.c', + 'system.c' +)) # The user-target is specialised by the guest specific_ss.add(when: 'CONFIG_USER_ONLY', if_true: files('user-target.c')) diff --git a/gdbstub/syscalls.c b/gdbstub/syscalls.c index 4e1295b..e855df2 100644 --- a/gdbstub/syscalls.c +++ b/gdbstub/syscalls.c @@ -7,13 +7,13 @@ * Copyright (c) 2003-2005 Fabrice Bellard * Copyright (c) 2023 Linaro Ltd * - * SPDX-License-Identifier: LGPL-2.0+ + * SPDX-License-Identifier: LGPL-2.0-or-later */ #include "qemu/osdep.h" #include "qemu/error-report.h" #include "semihosting/semihost.h" -#include "sysemu/runstate.h" +#include "system/runstate.h" #include "gdbstub/user.h" #include "gdbstub/syscalls.h" #include "gdbstub/commands.h" diff --git a/gdbstub/system.c b/gdbstub/system.c index 1ad87fe..8a32d8e 100644 --- a/gdbstub/system.c +++ b/gdbstub/system.c @@ -7,7 +7,7 @@ * Copyright (c) 2003-2005 Fabrice Bellard * Copyright (c) 2022 Linaro Ltd * - * SPDX-License-Identifier: LGPL-2.0+ + * SPDX-License-Identifier: LGPL-2.0-or-later */ #include "qemu/osdep.h" @@ -19,9 +19,11 @@ #include "gdbstub/commands.h" #include "exec/hwaddr.h" #include "exec/tb-flush.h" -#include "sysemu/cpus.h" -#include "sysemu/runstate.h" -#include "sysemu/replay.h" +#include "system/accel-ops.h" +#include "system/cpus.h" +#include "system/runstate.h" +#include "system/replay.h" +#include "system/tcg.h" #include "hw/core/cpu.h" #include "hw/cpu/cluster.h" #include "hw/boards.h" @@ -171,7 +173,9 @@ static void gdb_vm_state_change(void *opaque, bool running, RunState state) } else { trace_gdbstub_hit_break(); } - tb_flush(cpu); + if (tcg_enabled()) { + tb_flush(cpu); + } ret = GDB_SIGNAL_TRAP; break; case RUN_STATE_PAUSED: @@ -239,7 +243,7 @@ static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend, *be_opened = false; } -static void char_gdb_class_init(ObjectClass *oc, void *data) +static void char_gdb_class_init(ObjectClass *oc, const void *data) { ChardevClass *cc = CHARDEV_CLASS(oc); @@ -330,26 +334,27 @@ 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 +379,8 @@ 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 +412,7 @@ 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) @@ -450,8 +456,6 @@ static int phy_memory_mode; int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr, uint8_t *buf, int len, bool is_write) { - CPUClass *cc; - if (phy_memory_mode) { if (is_write) { cpu_physical_memory_write(addr, buf, len); @@ -461,9 +465,8 @@ int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr, return 0; } - cc = CPU_GET_CLASS(cpu); - if (cc->memory_rw_debug) { - return cc->memory_rw_debug(cpu, addr, buf, len, is_write); + if (cpu->cc->memory_rw_debug) { + return cpu->cc->memory_rw_debug(cpu, addr, buf, len, is_write); } return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); diff --git a/gdbstub/user-target.c b/gdbstub/user-target.c index b5e01fd..43231e6 100644 --- a/gdbstub/user-target.c +++ b/gdbstub/user-target.c @@ -4,7 +4,7 @@ * Copyright (c) 2003-2005 Fabrice Bellard * Copyright (c) 2022 Linaro Ltd * - * SPDX-License-Identifier: LGPL-2.0+ + * SPDX-License-Identifier: LGPL-2.0-or-later */ #include "qemu/osdep.h" @@ -233,10 +233,8 @@ void gdb_handle_query_offsets(GArray *params, void *user_ctx) static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr, uint8_t *buf, int len, bool is_write) { - CPUClass *cc; - cc = CPU_GET_CLASS(cpu); - if (cc->memory_rw_debug) { - return cc->memory_rw_debug(cpu, addr, buf, len, is_write); + if (cpu->cc->memory_rw_debug) { + return cpu->cc->memory_rw_debug(cpu, addr, buf, len, is_write); } return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); } @@ -317,9 +315,9 @@ void gdb_handle_v_file_open(GArray *params, void *user_ctx) int fd = open(filename, flags, mode); #endif if (fd < 0) { - g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno); } else { - g_string_printf(gdbserver_state.str_buf, "F%d", fd); + g_string_printf(gdbserver_state.str_buf, "F%x", fd); } gdb_put_strbuf(); } @@ -329,7 +327,7 @@ void gdb_handle_v_file_close(GArray *params, void *user_ctx) int fd = gdb_get_cmd_param(params, 0)->val_ul; if (close(fd) == -1) { - g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno); gdb_put_strbuf(); return; } @@ -352,7 +350,7 @@ void gdb_handle_v_file_pread(GArray *params, void *user_ctx) ssize_t n = pread(fd, buf, bufsiz, offset); if (n < 0) { - g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno); gdb_put_strbuf(); return; } @@ -375,7 +373,7 @@ void gdb_handle_v_file_readlink(GArray *params, void *user_ctx) ssize_t n = readlink(filename, buf, BUFSIZ); #endif if (n < 0) { - g_string_printf(gdbserver_state.str_buf, "F-1,%d", errno); + g_string_printf(gdbserver_state.str_buf, "F-1,%x", errno); gdb_put_strbuf(); return; } diff --git a/gdbstub/user.c b/gdbstub/user.c index b36033b..67403e5 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -6,13 +6,14 @@ * Copyright (c) 2003-2005 Fabrice Bellard * Copyright (c) 2022 Linaro Ltd * - * SPDX-License-Identifier: LGPL-2.0+ + * SPDX-License-Identifier: LGPL-2.0-or-later */ #include "qemu/osdep.h" #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" @@ -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" @@ -314,33 +316,20 @@ static bool gdb_accept_socket(int gdb_fd) return true; } -static int gdbserver_open_socket(const char *path) +static int gdbserver_open_socket(const char *path, Error **errp) { - struct sockaddr_un sockaddr = {}; - int fd, ret; + g_autoptr(GString) buf = g_string_new(""); + char *pid_placeholder; - fd = socket(AF_UNIX, SOCK_STREAM, 0); - if (fd < 0) { - perror("create socket"); - return -1; + pid_placeholder = strstr(path, "%d"); + if (pid_placeholder != NULL) { + g_string_append_len(buf, path, pid_placeholder - path); + g_string_append_printf(buf, "%d", qemu_get_thread_id()); + g_string_append(buf, pid_placeholder + 2); + path = buf->str; } - sockaddr.sun_family = AF_UNIX; - pstrcpy(sockaddr.sun_path, sizeof(sockaddr.sun_path) - 1, path); - ret = bind(fd, (struct sockaddr *)&sockaddr, sizeof(sockaddr)); - if (ret < 0) { - perror("bind socket"); - close(fd); - return -1; - } - ret = listen(fd, 1); - if (ret < 0) { - perror("listen socket"); - close(fd); - return -1; - } - - return fd; + return unix_listen(path, errp); } static bool gdb_accept_tcp(int gdb_fd) @@ -372,14 +361,14 @@ 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 +380,13 @@ 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 +394,122 @@ static int gdbserver_open_port(int port) return fd; } -int gdbserver_start(const char *port_or_path) +static bool gdbserver_accept(int port, int gdb_fd, const char *path) { - int port = g_ascii_strtoull(port_or_path, NULL, 10); - int gdb_fd; + bool ret; if (port > 0) { - gdb_fd = gdbserver_open_port(port); + ret = gdb_accept_tcp(gdb_fd); } else { - gdb_fd = gdbserver_open_socket(port_or_path); + ret = gdb_accept_socket(gdb_fd); + if (ret) { + gdbserver_user_state.socket_path = g_strdup(path); + } } - if (gdb_fd < 0) { - return -1; + if (!ret) { + close(gdb_fd); + } + + return ret; +} + +struct { + int port; + int gdb_fd; + char *path; +} gdbserver_args; + +static void do_gdb_handlesig(CPUState *cs, run_on_cpu_data arg) +{ + int sig; + + sig = target_to_host_signal(gdb_handlesig(cs, 0, NULL, NULL, 0)); + if (sig >= 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.path)) { + CPUState *cs = 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.path); + gdbserver_args.path = NULL; + + return NULL; +} + +#define USAGE "\nUsage: -g {port|path}[,suspend={y|n}]" + +bool gdbserver_start(const char *args, Error **errp) +{ + g_auto(GStrv) argv = g_strsplit(args, ",", 0); + const char *port_or_path = NULL; + bool suspend = true; + int gdb_fd, port; + GStrv arg; + + for (arg = argv; *arg; arg++) { + g_auto(GStrv) tokens = g_strsplit(*arg, "=", 2); + + if (g_strcmp0(tokens[0], "suspend") == 0) { + if (tokens[1] == NULL) { + error_setg(errp, + "gdbstub: missing \"suspend\" option value" USAGE); + return false; + } else if (!qapi_bool_parse(tokens[0], tokens[1], + &suspend, errp)) { + return false; + } + } else { + if (port_or_path) { + error_setg(errp, "gdbstub: unknown option \"%s\"" USAGE, *arg); + return false; + } + port_or_path = *arg; + } + } + if (!port_or_path) { + error_setg(errp, "gdbstub: port or path not specified" USAGE); + return false; } - if (port > 0 && gdb_accept_tcp(gdb_fd)) { - return 0; - } else if (gdb_accept_socket(gdb_fd)) { - gdbserver_user_state.socket_path = g_strdup(port_or_path); - return 0; + port = g_ascii_strtoull(port_or_path, NULL, 10); + if (port > 0) { + gdb_fd = gdbserver_open_port(port, errp); + } else { + gdb_fd = gdbserver_open_socket(port_or_path, errp); + } + if (gdb_fd < 0) { + return false; } - /* gone wrong */ - close(gdb_fd); - return -1; + if (suspend) { + if (gdbserver_accept(port, gdb_fd, port_or_path)) { + gdb_handlesig(first_cpu, 0, NULL, NULL, 0); + return true; + } else { + error_setg(errp, "gdbstub: failed to accept connection"); + return false; + } + } else { + QemuThread thread; + + gdbserver_args.port = port; + gdbserver_args.gdb_fd = gdb_fd; + gdbserver_args.path = g_strdup(port_or_path); + qemu_thread_create(&thread, "gdb-accept", + &gdbserver_accept_thread, NULL, + QEMU_THREAD_DETACHED); + return true; + } } void gdbserver_fork_start(void) @@ -663,11 +743,8 @@ int gdb_continue_partial(char *newstates) int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr, uint8_t *buf, int len, bool is_write) { - CPUClass *cc; - - cc = CPU_GET_CLASS(cpu); - if (cc->memory_rw_debug) { - return cc->memory_rw_debug(cpu, addr, buf, len, is_write); + if (cpu->cc->memory_rw_debug) { + return cpu->cc->memory_rw_debug(cpu, addr, buf, len, is_write); } return cpu_memory_rw_debug(cpu, addr, buf, len, is_write); } |