@@ -17,6 +17,18 @@
* Shared structures and definitions
*/
+enum {
+ GDB_SIGNAL_0 = 0,
+ GDB_SIGNAL_INT = 2,
+ GDB_SIGNAL_QUIT = 3,
+ GDB_SIGNAL_TRAP = 5,
+ GDB_SIGNAL_ABRT = 6,
+ GDB_SIGNAL_ALRM = 14,
+ GDB_SIGNAL_IO = 23,
+ GDB_SIGNAL_XCPU = 24,
+ GDB_SIGNAL_UNKNOWN = 143
+};
+
typedef struct GDBProcess {
uint32_t pid;
bool attached;
@@ -57,6 +69,8 @@ typedef struct GDBState {
int supported_sstep_flags;
} GDBState;
+/* lives in main gdbstub.c */
+extern GDBState gdbserver_state;
/*
* Inline utility function, convert from int to hex and back
@@ -101,7 +115,6 @@ CPUState *gdb_first_attached_cpu(void);
void gdb_append_thread_id(CPUState *cpu, GString *buf);
int gdb_get_cpu_index(CPUState *cpu);
-void gdb_init_gdbserver_state(void);
void gdb_create_default_process(GDBState *s);
/*
@@ -109,6 +122,34 @@ void gdb_create_default_process(GDBState *s);
*/
void gdb_put_buffer(const uint8_t *buf, int len);
+/*
+ * Command handlers - either softmmu or user only
+ */
+void gdb_init_gdbserver_state(void);
+
+typedef enum GDBThreadIdKind {
+ GDB_ONE_THREAD = 0,
+ GDB_ALL_THREADS, /* One process, all threads */
+ GDB_ALL_PROCESSES,
+ GDB_READ_THREAD_ERR
+} GDBThreadIdKind;
+
+typedef union GdbCmdVariant {
+ const char *data;
+ uint8_t opcode;
+ unsigned long val_ul;
+ unsigned long long val_ull;
+ struct {
+ GDBThreadIdKind kind;
+ uint32_t pid;
+ uint32_t tid;
+ } thread_id;
+} GdbCmdVariant;
+
+#define get_param(p, i) (&g_array_index(p, GdbCmdVariant, i))
+
+void gdb_handle_query_rcmd(GArray *params, void *user_ctx); /* softmmu */
+
/*
* Break/Watch point support - there is an implementation for softmmu
* and user mode.
@@ -24,8 +24,6 @@
*/
#include "qemu/osdep.h"
-#include "qapi/error.h"
-#include "qemu/error-report.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
@@ -34,9 +32,6 @@
#ifdef CONFIG_USER_ONLY
#include "qemu.h"
#else
-#include "monitor/monitor.h"
-#include "chardev/char.h"
-#include "chardev/char-fe.h"
#include "hw/cpu/cluster.h"
#include "hw/boards.h"
#endif
@@ -88,30 +83,15 @@ static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
/*
* Return the GDB index for a given vCPU state.
*
- * For user mode this is simply the thread id. In system mode GDB
- * numbers CPUs from 1 as 0 is reserved as an "any cpu" index.
+ * For user mode this is simply the thread id.
*/
+#if defined(CONFIG_USER_ONLY)
int gdb_get_cpu_index(CPUState *cpu)
{
-#if defined(CONFIG_USER_ONLY)
TaskState *ts = (TaskState *) cpu->opaque;
return ts ? ts->ts_tid : -1;
-#else
- return cpu->cpu_index + 1;
-#endif
}
-
-enum {
- GDB_SIGNAL_0 = 0,
- GDB_SIGNAL_INT = 2,
- GDB_SIGNAL_QUIT = 3,
- GDB_SIGNAL_TRAP = 5,
- GDB_SIGNAL_ABRT = 6,
- GDB_SIGNAL_ALRM = 14,
- GDB_SIGNAL_IO = 23,
- GDB_SIGNAL_XCPU = 24,
- GDB_SIGNAL_UNKNOWN = 143
-};
+#endif
#ifdef CONFIG_USER_ONLY
@@ -333,15 +313,9 @@ typedef struct {
int running_state;
} GDBUserState;
static GDBUserState gdbserver_user_state;
-#else
-typedef struct {
- CharBackend chr;
- Chardev *mon_chr;
-} GDBSystemState;
-static GDBSystemState gdbserver_system_state;
#endif
-static GDBState gdbserver_state;
+GDBState gdbserver_state;
void gdb_init_gdbserver_state(void)
{
@@ -362,15 +336,6 @@ void gdb_init_gdbserver_state(void)
gdbserver_state.sstep_flags &= gdbserver_state.supported_sstep_flags;
}
-#ifndef CONFIG_USER_ONLY
-static void reset_gdbserver_state(void)
-{
- g_free(gdbserver_state.processes);
- gdbserver_state.processes = NULL;
- gdbserver_state.process_num = 0;
-}
-#endif
-
bool gdb_has_xml;
#ifdef CONFIG_USER_ONLY
@@ -446,7 +411,7 @@ static bool stub_can_reverse(void)
}
/* Resume execution. */
-static inline void gdb_continue(void)
+static void gdb_continue(void)
{
#ifdef CONFIG_USER_ONLY
@@ -525,9 +490,9 @@ static int gdb_continue_partial(char *newstates)
return res;
}
+#ifdef CONFIG_USER_ONLY
void gdb_put_buffer(const uint8_t *buf, int len)
{
-#ifdef CONFIG_USER_ONLY
int ret;
while (len > 0) {
@@ -540,12 +505,8 @@ void gdb_put_buffer(const uint8_t *buf, int len)
len -= ret;
}
}
-#else
- /* XXX this blocks entire thread. Rewrite to use
- * qemu_chr_fe_write and background I/O callbacks */
- qemu_chr_fe_write_all(&gdbserver_system_state.chr, buf, len);
-#endif
}
+#endif
/* writes 2*len+1 bytes in buf */
void gdb_memtohex(GString *buf, const uint8_t *mem, int len)
@@ -993,13 +954,6 @@ void gdb_append_thread_id(CPUState *cpu, GString *buf)
}
}
-typedef enum GDBThreadIdKind {
- GDB_ONE_THREAD = 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_buf,
uint32_t *pid, uint32_t *tid)
{
@@ -1180,20 +1134,6 @@ out:
return res;
}
-typedef union GdbCmdVariant {
- const char *data;
- uint8_t opcode;
- unsigned long val_ul;
- unsigned long long val_ull;
- struct {
- GDBThreadIdKind kind;
- uint32_t pid;
- uint32_t tid;
- } thread_id;
-} GdbCmdVariant;
-
-#define get_param(p, i) (&g_array_index(p, GdbCmdVariant, i))
-
static const char *cmd_next_param(const char *param, const char delimiter)
{
static const char all_delimiters[] = ",;:=";
@@ -2025,32 +1965,6 @@ static void handle_query_offsets(GArray *params, void *user_ctx)
ts->info->data_offset);
gdb_put_strbuf();
}
-#else
-static void handle_query_rcmd(GArray *params, void *user_ctx)
-{
- const guint8 zero = 0;
- int len;
-
- if (!params->len) {
- gdb_put_packet("E22");
- return;
- }
-
- len = strlen(get_param(params, 0)->data);
- if (len % 2) {
- gdb_put_packet("E01");
- return;
- }
-
- g_assert(gdbserver_state.mem_buf->len == 0);
- len = len / 2;
- gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len);
- g_byte_array_append(gdbserver_state.mem_buf, &zero, 1);
- qemu_chr_be_write(gdbserver_system_state.mon_chr,
- gdbserver_state.mem_buf->data,
- gdbserver_state.mem_buf->len);
- gdb_put_packet("OK");
-}
#endif
static void handle_query_supported(GArray *params, void *user_ctx)
@@ -2264,7 +2178,7 @@ static const GdbCmdParseEntry gdb_gen_query_table[] = {
},
#else
{
- .handler = handle_query_rcmd,
+ .handler = gdb_handle_query_rcmd,
.cmd = "Rcmd,",
.cmd_startswith = 1,
.schema = "s0"
@@ -2648,100 +2562,6 @@ void gdb_set_stop_cpu(CPUState *cpu)
gdbserver_state.g_cpu = cpu;
}
-#ifndef CONFIG_USER_ONLY
-static void gdb_vm_state_change(void *opaque, bool running, RunState state)
-{
- CPUState *cpu = gdbserver_state.c_cpu;
- g_autoptr(GString) buf = g_string_new(NULL);
- g_autoptr(GString) tid = g_string_new(NULL);
- const char *type;
- int ret;
-
- if (running || gdbserver_state.state == RS_INACTIVE) {
- return;
- }
- /* Is there a GDB syscall waiting to be sent? */
- if (gdbserver_state.current_syscall_cb) {
- gdb_put_packet(gdbserver_state.syscall_buf);
- return;
- }
-
- if (cpu == NULL) {
- /* No process attached */
- return;
- }
-
- gdb_append_thread_id(cpu, tid);
-
- switch (state) {
- case RUN_STATE_DEBUG:
- if (cpu->watchpoint_hit) {
- switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
- case BP_MEM_READ:
- type = "r";
- break;
- case BP_MEM_ACCESS:
- type = "a";
- break;
- default:
- type = "";
- break;
- }
- trace_gdbstub_hit_watchpoint(type, gdb_get_cpu_index(cpu),
- (target_ulong)cpu->watchpoint_hit->vaddr);
- g_string_printf(buf, "T%02xthread:%s;%swatch:" TARGET_FMT_lx ";",
- GDB_SIGNAL_TRAP, tid->str, type,
- (target_ulong)cpu->watchpoint_hit->vaddr);
- cpu->watchpoint_hit = NULL;
- goto send_packet;
- } else {
- trace_gdbstub_hit_break();
- }
- tb_flush(cpu);
- ret = GDB_SIGNAL_TRAP;
- break;
- case RUN_STATE_PAUSED:
- trace_gdbstub_hit_paused();
- ret = GDB_SIGNAL_INT;
- break;
- case RUN_STATE_SHUTDOWN:
- trace_gdbstub_hit_shutdown();
- ret = GDB_SIGNAL_QUIT;
- break;
- case RUN_STATE_IO_ERROR:
- trace_gdbstub_hit_io_error();
- ret = GDB_SIGNAL_IO;
- break;
- case RUN_STATE_WATCHDOG:
- trace_gdbstub_hit_watchdog();
- ret = GDB_SIGNAL_ALRM;
- break;
- case RUN_STATE_INTERNAL_ERROR:
- trace_gdbstub_hit_internal_error();
- ret = GDB_SIGNAL_ABRT;
- break;
- case RUN_STATE_SAVE_VM:
- case RUN_STATE_RESTORE_VM:
- return;
- case RUN_STATE_FINISH_MIGRATE:
- ret = GDB_SIGNAL_XCPU;
- break;
- default:
- trace_gdbstub_hit_unknown(state);
- ret = GDB_SIGNAL_UNKNOWN;
- break;
- }
- gdb_set_stop_cpu(cpu);
- g_string_printf(buf, "T%02xthread:%s;", ret, tid->str);
-
-send_packet:
- gdb_put_packet(buf->str);
-
- /* disable single step if it was enabled */
- cpu_single_step(cpu, 0);
-}
-#endif
-
/* Send a gdb syscall request.
This accepts limited printf-style format specifiers, specifically:
%x - target_ulong argument printed in hex.
@@ -2971,6 +2791,7 @@ void gdb_read_byte(uint8_t ch)
}
}
+#ifdef CONFIG_USER_ONLY
/* Tell the remote gdb that the process has exited. */
void gdb_exit(int code)
{
@@ -2979,24 +2800,19 @@ void gdb_exit(int code)
if (!gdbserver_state.init) {
return;
}
-#ifdef CONFIG_USER_ONLY
if (gdbserver_user_state.socket_path) {
unlink(gdbserver_user_state.socket_path);
}
if (gdbserver_user_state.fd < 0) {
return;
}
-#endif
trace_gdbstub_op_exiting((uint8_t)code);
snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
gdb_put_packet(buf);
-
-#ifndef CONFIG_USER_ONLY
- qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
-#endif
}
+#endif
/*
* Create the process that will contain all the "orphan" CPUs (that are not
@@ -3252,221 +3068,4 @@ void gdbserver_fork(CPUState *cpu)
cpu_breakpoint_remove_all(cpu, BP_GDB);
cpu_watchpoint_remove_all(cpu, BP_GDB);
}
-#else
-static int gdb_chr_can_receive(void *opaque)
-{
- /* We can handle an arbitrarily large amount of data.
- Pick the maximum packet size, which is as good as anything. */
- return MAX_PACKET_LENGTH;
-}
-
-static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
-{
- int i;
-
- for (i = 0; i < size; i++) {
- gdb_read_byte(buf[i]);
- }
-}
-
-static void gdb_chr_event(void *opaque, QEMUChrEvent event)
-{
- int i;
- GDBState *s = (GDBState *) opaque;
-
- switch (event) {
- case CHR_EVENT_OPENED:
- /* Start with first process attached, others detached */
- for (i = 0; i < s->process_num; i++) {
- s->processes[i].attached = !i;
- }
-
- s->c_cpu = gdb_first_attached_cpu();
- s->g_cpu = s->c_cpu;
-
- vm_stop(RUN_STATE_PAUSED);
- replay_gdb_attached();
- gdb_has_xml = false;
- break;
- default:
- break;
- }
-}
-
-static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
-{
- g_autoptr(GString) hex_buf = g_string_new("O");
- gdb_memtohex(hex_buf, buf, len);
- gdb_put_packet(hex_buf->str);
- return len;
-}
-
-#ifndef _WIN32
-static void gdb_sigterm_handler(int signal)
-{
- if (runstate_is_running()) {
- vm_stop(RUN_STATE_PAUSED);
- }
-}
-#endif
-
-static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend,
- bool *be_opened, Error **errp)
-{
- *be_opened = false;
-}
-
-static void char_gdb_class_init(ObjectClass *oc, void *data)
-{
- ChardevClass *cc = CHARDEV_CLASS(oc);
-
- cc->internal = true;
- cc->open = gdb_monitor_open;
- cc->chr_write = gdb_monitor_write;
-}
-
-#define TYPE_CHARDEV_GDB "chardev-gdb"
-
-static const TypeInfo char_gdb_type_info = {
- .name = TYPE_CHARDEV_GDB,
- .parent = TYPE_CHARDEV,
- .class_init = char_gdb_class_init,
-};
-
-static int find_cpu_clusters(Object *child, void *opaque)
-{
- if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) {
- GDBState *s = (GDBState *) opaque;
- CPUClusterState *cluster = CPU_CLUSTER(child);
- GDBProcess *process;
-
- s->processes = g_renew(GDBProcess, s->processes, ++s->process_num);
-
- process = &s->processes[s->process_num - 1];
-
- /*
- * GDB process IDs -1 and 0 are reserved. To avoid subtle errors at
- * runtime, we enforce here that the machine does not use a cluster ID
- * that would lead to PID 0.
- */
- assert(cluster->cluster_id != UINT32_MAX);
- process->pid = cluster->cluster_id + 1;
- process->attached = false;
- process->target_xml[0] = '\0';
-
- return 0;
- }
-
- return object_child_foreach(child, find_cpu_clusters, opaque);
-}
-
-static int pid_order(const void *a, const void *b)
-{
- GDBProcess *pa = (GDBProcess *) a;
- GDBProcess *pb = (GDBProcess *) b;
-
- if (pa->pid < pb->pid) {
- return -1;
- } else if (pa->pid > pb->pid) {
- return 1;
- } else {
- return 0;
- }
-}
-
-static void create_processes(GDBState *s)
-{
- object_child_foreach(object_get_root(), find_cpu_clusters, s);
-
- if (gdbserver_state.processes) {
- /* Sort by PID */
- qsort(gdbserver_state.processes, gdbserver_state.process_num, sizeof(gdbserver_state.processes[0]), pid_order);
- }
-
- gdb_create_default_process(s);
-}
-
-int gdbserver_start(const char *device)
-{
- trace_gdbstub_op_start(device);
-
- char gdbstub_device_name[128];
- Chardev *chr = NULL;
- Chardev *mon_chr;
-
- if (!first_cpu) {
- error_report("gdbstub: meaningless to attach gdb to a "
- "machine without any CPU.");
- return -1;
- }
-
- if (!gdb_supports_guest_debug()) {
- error_report("gdbstub: current accelerator doesn't support guest debugging");
- return -1;
- }
-
- if (!device)
- return -1;
- if (strcmp(device, "none") != 0) {
- if (strstart(device, "tcp:", NULL)) {
- /* enforce required TCP attributes */
- snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
- "%s,wait=off,nodelay=on,server=on", device);
- device = gdbstub_device_name;
- }
-#ifndef _WIN32
- else if (strcmp(device, "stdio") == 0) {
- struct sigaction act;
-
- memset(&act, 0, sizeof(act));
- act.sa_handler = gdb_sigterm_handler;
- sigaction(SIGINT, &act, NULL);
- }
-#endif
- /*
- * FIXME: it's a bit weird to allow using a mux chardev here
- * and implicitly setup a monitor. We may want to break this.
- */
- chr = qemu_chr_new_noreplay("gdb", device, true, NULL);
- if (!chr)
- return -1;
- }
-
- if (!gdbserver_state.init) {
- gdb_init_gdbserver_state();
-
- qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
-
- /* Initialize a monitor terminal for gdb */
- mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB,
- NULL, NULL, &error_abort);
- monitor_init_hmp(mon_chr, false, &error_abort);
- } else {
- qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
- mon_chr = gdbserver_system_state.mon_chr;
- reset_gdbserver_state();
- }
-
- create_processes(&gdbserver_state);
-
- if (chr) {
- qemu_chr_fe_init(&gdbserver_system_state.chr, chr, &error_abort);
- qemu_chr_fe_set_handlers(&gdbserver_system_state.chr,
- gdb_chr_can_receive,
- gdb_chr_receive, gdb_chr_event,
- NULL, &gdbserver_state, NULL, true);
- }
- gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE;
- gdbserver_system_state.mon_chr = mon_chr;
- gdbserver_state.current_syscall_cb = NULL;
-
- return 0;
-}
-
-static void register_types(void)
-{
- type_register_static(&char_gdb_type_info);
-}
-
-type_init(register_types);
#endif
@@ -11,10 +11,433 @@
*/
#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/cutils.h"
#include "exec/gdbstub.h"
+#include "exec/hwaddr.h"
+#include "exec/tb-flush.h"
#include "sysemu/cpus.h"
+#include "sysemu/runstate.h"
+#include "sysemu/replay.h"
+#include "hw/core/cpu.h"
+#include "hw/cpu/cluster.h"
+#include "hw/boards.h"
+#include "chardev/char.h"
+#include "chardev/char-fe.h"
+#include "monitor/monitor.h"
+#include "trace.h"
#include "internals.h"
+/* System emulation specific state */
+typedef struct {
+ CharBackend chr;
+ Chardev *mon_chr;
+} GDBSystemState;
+
+GDBSystemState gdbserver_system_state;
+
+static void reset_gdbserver_state(void)
+{
+ g_free(gdbserver_state.processes);
+ gdbserver_state.processes = NULL;
+ gdbserver_state.process_num = 0;
+}
+
+/*
+ * Return the GDB index for a given vCPU state.
+ *
+ * In system mode GDB numbers CPUs from 1 as 0 is reserved as an "any
+ * cpu" index.
+ */
+int gdb_get_cpu_index(CPUState *cpu)
+{
+ return cpu->cpu_index + 1;
+}
+
+/*
+ * GDB Connection management. For system emulation we do all of this
+ * via our existing Chardev infrastructure which allows us to support
+ * network and unix sockets.
+ */
+
+void gdb_put_buffer(const uint8_t *buf, int len)
+{
+ /*
+ * XXX this blocks entire thread. Rewrite to use
+ * qemu_chr_fe_write and background I/O callbacks
+ */
+ qemu_chr_fe_write_all(&gdbserver_system_state.chr, buf, len);
+}
+
+static void gdb_chr_event(void *opaque, QEMUChrEvent event)
+{
+ int i;
+ GDBState *s = (GDBState *) opaque;
+
+ switch (event) {
+ case CHR_EVENT_OPENED:
+ /* Start with first process attached, others detached */
+ for (i = 0; i < s->process_num; i++) {
+ s->processes[i].attached = !i;
+ }
+
+ s->c_cpu = gdb_first_attached_cpu();
+ s->g_cpu = s->c_cpu;
+
+ vm_stop(RUN_STATE_PAUSED);
+ replay_gdb_attached();
+ gdb_has_xml = false;
+ break;
+ default:
+ break;
+ }
+}
+
+static void gdb_vm_state_change(void *opaque, bool running, RunState state)
+{
+ CPUState *cpu = gdbserver_state.c_cpu;
+ g_autoptr(GString) buf = g_string_new(NULL);
+ g_autoptr(GString) tid = g_string_new(NULL);
+ const char *type;
+ int ret;
+
+ if (running || gdbserver_state.state == RS_INACTIVE) {
+ return;
+ }
+ /* Is there a GDB syscall waiting to be sent? */
+ if (gdbserver_state.current_syscall_cb) {
+ gdb_put_packet(gdbserver_state.syscall_buf);
+ return;
+ }
+
+ if (cpu == NULL) {
+ /* No process attached */
+ return;
+ }
+
+ gdb_append_thread_id(cpu, tid);
+
+ switch (state) {
+ case RUN_STATE_DEBUG:
+ if (cpu->watchpoint_hit) {
+ switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
+ case BP_MEM_READ:
+ type = "r";
+ break;
+ case BP_MEM_ACCESS:
+ type = "a";
+ break;
+ default:
+ type = "";
+ break;
+ }
+ trace_gdbstub_hit_watchpoint(type,
+ gdb_get_cpu_index(cpu),
+ cpu->watchpoint_hit->vaddr);
+ g_string_printf(buf, "T%02xthread:%s;%swatch:%" VADDR_PRIx ";",
+ GDB_SIGNAL_TRAP, tid->str, type,
+ cpu->watchpoint_hit->vaddr);
+ cpu->watchpoint_hit = NULL;
+ goto send_packet;
+ } else {
+ trace_gdbstub_hit_break();
+ }
+ tb_flush(cpu);
+ ret = GDB_SIGNAL_TRAP;
+ break;
+ case RUN_STATE_PAUSED:
+ trace_gdbstub_hit_paused();
+ ret = GDB_SIGNAL_INT;
+ break;
+ case RUN_STATE_SHUTDOWN:
+ trace_gdbstub_hit_shutdown();
+ ret = GDB_SIGNAL_QUIT;
+ break;
+ case RUN_STATE_IO_ERROR:
+ trace_gdbstub_hit_io_error();
+ ret = GDB_SIGNAL_IO;
+ break;
+ case RUN_STATE_WATCHDOG:
+ trace_gdbstub_hit_watchdog();
+ ret = GDB_SIGNAL_ALRM;
+ break;
+ case RUN_STATE_INTERNAL_ERROR:
+ trace_gdbstub_hit_internal_error();
+ ret = GDB_SIGNAL_ABRT;
+ break;
+ case RUN_STATE_SAVE_VM:
+ case RUN_STATE_RESTORE_VM:
+ return;
+ case RUN_STATE_FINISH_MIGRATE:
+ ret = GDB_SIGNAL_XCPU;
+ break;
+ default:
+ trace_gdbstub_hit_unknown(state);
+ ret = GDB_SIGNAL_UNKNOWN;
+ break;
+ }
+ gdb_set_stop_cpu(cpu);
+ g_string_printf(buf, "T%02xthread:%s;", ret, tid->str);
+
+send_packet:
+ gdb_put_packet(buf->str);
+
+ /* disable single step if it was enabled */
+ cpu_single_step(cpu, 0);
+}
+
+#ifndef _WIN32
+static void gdb_sigterm_handler(int signal)
+{
+ if (runstate_is_running()) {
+ vm_stop(RUN_STATE_PAUSED);
+ }
+}
+#endif
+
+static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
+{
+ g_autoptr(GString) hex_buf = g_string_new("O");
+ gdb_memtohex(hex_buf, buf, len);
+ gdb_put_packet(hex_buf->str);
+ return len;
+}
+
+static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend,
+ bool *be_opened, Error **errp)
+{
+ *be_opened = false;
+}
+
+static void char_gdb_class_init(ObjectClass *oc, void *data)
+{
+ ChardevClass *cc = CHARDEV_CLASS(oc);
+
+ cc->internal = true;
+ cc->open = gdb_monitor_open;
+ cc->chr_write = gdb_monitor_write;
+}
+
+#define TYPE_CHARDEV_GDB "chardev-gdb"
+
+static const TypeInfo char_gdb_type_info = {
+ .name = TYPE_CHARDEV_GDB,
+ .parent = TYPE_CHARDEV,
+ .class_init = char_gdb_class_init,
+};
+
+static int gdb_chr_can_receive(void *opaque)
+{
+ /*
+ * We can handle an arbitrarily large amount of data.
+ * Pick the maximum packet size, which is as good as anything.
+ */
+ return MAX_PACKET_LENGTH;
+}
+
+static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
+{
+ int i;
+
+ for (i = 0; i < size; i++) {
+ gdb_read_byte(buf[i]);
+ }
+}
+
+static int find_cpu_clusters(Object *child, void *opaque)
+{
+ if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) {
+ GDBState *s = (GDBState *) opaque;
+ CPUClusterState *cluster = CPU_CLUSTER(child);
+ GDBProcess *process;
+
+ s->processes = g_renew(GDBProcess, s->processes, ++s->process_num);
+
+ process = &s->processes[s->process_num - 1];
+
+ /*
+ * GDB process IDs -1 and 0 are reserved. To avoid subtle errors at
+ * runtime, we enforce here that the machine does not use a cluster ID
+ * that would lead to PID 0.
+ */
+ assert(cluster->cluster_id != UINT32_MAX);
+ process->pid = cluster->cluster_id + 1;
+ process->attached = false;
+ process->target_xml[0] = '\0';
+
+ return 0;
+ }
+
+ return object_child_foreach(child, find_cpu_clusters, opaque);
+}
+
+static int pid_order(const void *a, const void *b)
+{
+ GDBProcess *pa = (GDBProcess *) a;
+ GDBProcess *pb = (GDBProcess *) b;
+
+ if (pa->pid < pb->pid) {
+ return -1;
+ } else if (pa->pid > pb->pid) {
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+static void create_processes(GDBState *s)
+{
+ object_child_foreach(object_get_root(), find_cpu_clusters, s);
+
+ if (gdbserver_state.processes) {
+ /* Sort by PID */
+ qsort(gdbserver_state.processes,
+ gdbserver_state.process_num,
+ sizeof(gdbserver_state.processes[0]),
+ pid_order);
+ }
+
+ gdb_create_default_process(s);
+}
+
+int gdbserver_start(const char *device)
+{
+ trace_gdbstub_op_start(device);
+
+ char gdbstub_device_name[128];
+ Chardev *chr = NULL;
+ Chardev *mon_chr;
+
+ if (!first_cpu) {
+ error_report("gdbstub: meaningless to attach gdb to a "
+ "machine without any CPU.");
+ return -1;
+ }
+
+ if (!gdb_supports_guest_debug()) {
+ error_report("gdbstub: current accelerator doesn't "
+ "support guest debugging");
+ return -1;
+ }
+
+ if (!device) {
+ return -1;
+ }
+ if (strcmp(device, "none") != 0) {
+ if (strstart(device, "tcp:", NULL)) {
+ /* enforce required TCP attributes */
+ snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
+ "%s,wait=off,nodelay=on,server=on", device);
+ device = gdbstub_device_name;
+ }
+#ifndef _WIN32
+ else if (strcmp(device, "stdio") == 0) {
+ struct sigaction act;
+
+ memset(&act, 0, sizeof(act));
+ act.sa_handler = gdb_sigterm_handler;
+ sigaction(SIGINT, &act, NULL);
+ }
+#endif
+ /*
+ * FIXME: it's a bit weird to allow using a mux chardev here
+ * and implicitly setup a monitor. We may want to break this.
+ */
+ chr = qemu_chr_new_noreplay("gdb", device, true, NULL);
+ if (!chr) {
+ return -1;
+ }
+ }
+
+ if (!gdbserver_state.init) {
+ gdb_init_gdbserver_state();
+
+ qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
+
+ /* Initialize a monitor terminal for gdb */
+ mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB,
+ NULL, NULL, &error_abort);
+ monitor_init_hmp(mon_chr, false, &error_abort);
+ } else {
+ qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
+ mon_chr = gdbserver_system_state.mon_chr;
+ reset_gdbserver_state();
+ }
+
+ create_processes(&gdbserver_state);
+
+ if (chr) {
+ qemu_chr_fe_init(&gdbserver_system_state.chr, chr, &error_abort);
+ qemu_chr_fe_set_handlers(&gdbserver_system_state.chr,
+ gdb_chr_can_receive,
+ gdb_chr_receive, gdb_chr_event,
+ NULL, &gdbserver_state, NULL, true);
+ }
+ gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE;
+ gdbserver_system_state.mon_chr = mon_chr;
+ gdbserver_state.current_syscall_cb = NULL;
+
+ return 0;
+}
+
+static void register_types(void)
+{
+ type_register_static(&char_gdb_type_info);
+}
+
+type_init(register_types);
+
+/* Tell the remote gdb that the process has exited. */
+void gdb_exit(int code)
+{
+ char buf[4];
+
+ if (!gdbserver_state.init) {
+ return;
+ }
+
+ trace_gdbstub_op_exiting((uint8_t)code);
+
+ snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
+ gdb_put_packet(buf);
+
+ qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
+}
+
+/*
+ * Softmmu specific command helpers
+ */
+void gdb_handle_query_rcmd(GArray *params, void *user_ctx)
+{
+ const guint8 zero = 0;
+ int len;
+
+ if (!params->len) {
+ gdb_put_packet("E22");
+ return;
+ }
+
+ len = strlen(get_param(params, 0)->data);
+ if (len % 2) {
+ gdb_put_packet("E01");
+ return;
+ }
+
+ g_assert(gdbserver_state.mem_buf->len == 0);
+ len = len / 2;
+ gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len);
+ g_byte_array_append(gdbserver_state.mem_buf, &zero, 1);
+ qemu_chr_be_write(gdbserver_system_state.mon_chr,
+ gdbserver_state.mem_buf->data,
+ gdbserver_state.mem_buf->len);
+ gdb_put_packet("OK");
+}
+
+/*
+ * Break/Watch point helpers
+ */
+
bool gdb_supports_guest_debug(void)
{
const AccelOpsClass *ops = cpus_get_accel();
@@ -7,7 +7,6 @@ gdbstub_op_continue(void) "Continuing all CPUs"
gdbstub_op_continue_cpu(int cpu_index) "Continuing CPU %d"
gdbstub_op_stepping(int cpu_index) "Stepping CPU %d"
gdbstub_op_extra_info(const char *info) "Thread extra info: %s"
-gdbstub_hit_watchpoint(const char *type, int cpu_gdb_index, uint64_t vaddr) "Watchpoint hit, type=\"%s\" cpu=%d, vaddr=0x%" PRIx64 ""
gdbstub_hit_internal_error(void) "RUN_STATE_INTERNAL_ERROR"
gdbstub_hit_break(void) "RUN_STATE_DEBUG"
gdbstub_hit_paused(void) "RUN_STATE_PAUSED"
@@ -27,3 +26,6 @@ gdbstub_err_invalid_repeat(uint8_t ch) "got invalid RLE count: 0x%02x"
gdbstub_err_invalid_rle(void) "got invalid RLE sequence"
gdbstub_err_checksum_invalid(uint8_t ch) "got invalid command checksum digit: 0x%02x"
gdbstub_err_checksum_incorrect(uint8_t expected, uint8_t got) "got command packet with incorrect checksum, expected=0x%02x, received=0x%02x"
+
+# softmmu.c
+gdbstub_hit_watchpoint(const char *type, int cpu_gdb_index, uint64_t vaddr) "Watchpoint hit, type=\"%s\" cpu=%d, vaddr=0x%" PRIx64 ""