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gdbstub: move chunk of softmmu functionality to own file

Browse source 
This is mostly code motion but a number of things needed to be done
for this minimal patch set:

  - move shared structures to internals.h
  - splitting some functions into user and softmmu versions
  - fixing a few casting issues to keep softmmu common

More CONFIG_USER_ONLY stuff will be handled in a following patches.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Message-Id: <20230302190846.2593720-11-alex.bennee@linaro.org>
Message-Id: <20230303025805.625589-11-richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2023-03-02 18:57:46 -08:00
parent 36e067b2f2
commit b6fa2ec238
4 changed files with 478 additions and 413 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

421
gdbstub/gdbstub.c
View file

@ -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

43
gdbstub/internals.h
View file

@ -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.

423
gdbstub/softmmu.c
View file

@ -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();

4
gdbstub/trace-events
View file

@ -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 ""