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qemu-e2k/gdbstub.c
Maxim Levitsky 12bc5b4cd5 gdbstub, kvm: let KVM report supported singlestep flags 
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
[Extracted from Maxim's patch into a separate commit. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20211111110604.207376-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-12-10 09:47:18 +01:00

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92 KiB
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/*
* gdb server stub
*
* This implements a subset of the remote protocol as described in:
*
* https://sourceware.org/gdb/onlinedocs/gdb/Remote-Protocol.html
*
* Copyright (c) 2003-2005 Fabrice Bellard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* 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+
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qemu/error-report.h"
#include "qemu/ctype.h"
#include "qemu/cutils.h"
#include "qemu/module.h"
#include "trace/trace-root.h"
#include "exec/gdbstub.h"
#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
#define MAX_PACKET_LENGTH 4096
#include "qemu/sockets.h"
#include "sysemu/hw_accel.h"
#include "sysemu/kvm.h"
#include "sysemu/runstate.h"
#include "semihosting/semihost.h"
#include "exec/exec-all.h"
#include "sysemu/replay.h"
#ifdef CONFIG_USER_ONLY
#define GDB_ATTACHED "0"
#else
#define GDB_ATTACHED "1"
#endif
#ifndef CONFIG_USER_ONLY
static int phy_memory_mode;
#endif
static inline int target_memory_rw_debug(CPUState *cpu, target_ulong addr,
uint8_t *buf, int len, bool is_write)
{
CPUClass *cc;
#ifndef CONFIG_USER_ONLY
if (phy_memory_mode) {
if (is_write) {
cpu_physical_memory_write(addr, buf, len);
} else {
cpu_physical_memory_read(addr, buf, len);
}
return 0;
}
#endif
cc = CPU_GET_CLASS(cpu);
if (cc->memory_rw_debug) {
return cc->memory_rw_debug(cpu, addr, buf, len, is_write);
}
return cpu_memory_rw_debug(cpu, addr, buf, len, is_write);
}
/* 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.
*/
static inline int cpu_gdb_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
};
#ifdef CONFIG_USER_ONLY
/* Map target signal numbers to GDB protocol signal numbers and vice
* versa. For user emulation's currently supported systems, we can
* assume most signals are defined.
*/
static int gdb_signal_table[] = {
0,
TARGET_SIGHUP,
TARGET_SIGINT,
TARGET_SIGQUIT,
TARGET_SIGILL,
TARGET_SIGTRAP,
TARGET_SIGABRT,
-1, /* SIGEMT */
TARGET_SIGFPE,
TARGET_SIGKILL,
TARGET_SIGBUS,
TARGET_SIGSEGV,
TARGET_SIGSYS,
TARGET_SIGPIPE,
TARGET_SIGALRM,
TARGET_SIGTERM,
TARGET_SIGURG,
TARGET_SIGSTOP,
TARGET_SIGTSTP,
TARGET_SIGCONT,
TARGET_SIGCHLD,
TARGET_SIGTTIN,
TARGET_SIGTTOU,
TARGET_SIGIO,
TARGET_SIGXCPU,
TARGET_SIGXFSZ,
TARGET_SIGVTALRM,
TARGET_SIGPROF,
TARGET_SIGWINCH,
-1, /* SIGLOST */
TARGET_SIGUSR1,
TARGET_SIGUSR2,
#ifdef TARGET_SIGPWR
TARGET_SIGPWR,
#else
-1,
#endif
-1, /* SIGPOLL */
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
-1,
#ifdef __SIGRTMIN
__SIGRTMIN + 1,
__SIGRTMIN + 2,
__SIGRTMIN + 3,
__SIGRTMIN + 4,
__SIGRTMIN + 5,
__SIGRTMIN + 6,
__SIGRTMIN + 7,
__SIGRTMIN + 8,
__SIGRTMIN + 9,
__SIGRTMIN + 10,
__SIGRTMIN + 11,
__SIGRTMIN + 12,
__SIGRTMIN + 13,
__SIGRTMIN + 14,
__SIGRTMIN + 15,
__SIGRTMIN + 16,
__SIGRTMIN + 17,
__SIGRTMIN + 18,
__SIGRTMIN + 19,
__SIGRTMIN + 20,
__SIGRTMIN + 21,
__SIGRTMIN + 22,
__SIGRTMIN + 23,
__SIGRTMIN + 24,
__SIGRTMIN + 25,
__SIGRTMIN + 26,
__SIGRTMIN + 27,
__SIGRTMIN + 28,
__SIGRTMIN + 29,
__SIGRTMIN + 30,
__SIGRTMIN + 31,
-1, /* SIGCANCEL */
__SIGRTMIN,
__SIGRTMIN + 32,
__SIGRTMIN + 33,
__SIGRTMIN + 34,
__SIGRTMIN + 35,
__SIGRTMIN + 36,
__SIGRTMIN + 37,
__SIGRTMIN + 38,
__SIGRTMIN + 39,
__SIGRTMIN + 40,
__SIGRTMIN + 41,
__SIGRTMIN + 42,
__SIGRTMIN + 43,
__SIGRTMIN + 44,
__SIGRTMIN + 45,
__SIGRTMIN + 46,
__SIGRTMIN + 47,
__SIGRTMIN + 48,
__SIGRTMIN + 49,
__SIGRTMIN + 50,
__SIGRTMIN + 51,
__SIGRTMIN + 52,
__SIGRTMIN + 53,
__SIGRTMIN + 54,
__SIGRTMIN + 55,
__SIGRTMIN + 56,
__SIGRTMIN + 57,
__SIGRTMIN + 58,
__SIGRTMIN + 59,
__SIGRTMIN + 60,
__SIGRTMIN + 61,
__SIGRTMIN + 62,
__SIGRTMIN + 63,
__SIGRTMIN + 64,
__SIGRTMIN + 65,
__SIGRTMIN + 66,
__SIGRTMIN + 67,
__SIGRTMIN + 68,
__SIGRTMIN + 69,
__SIGRTMIN + 70,
__SIGRTMIN + 71,
__SIGRTMIN + 72,
__SIGRTMIN + 73,
__SIGRTMIN + 74,
__SIGRTMIN + 75,
__SIGRTMIN + 76,
__SIGRTMIN + 77,
__SIGRTMIN + 78,
__SIGRTMIN + 79,
__SIGRTMIN + 80,
__SIGRTMIN + 81,
__SIGRTMIN + 82,
__SIGRTMIN + 83,
__SIGRTMIN + 84,
__SIGRTMIN + 85,
__SIGRTMIN + 86,
__SIGRTMIN + 87,
__SIGRTMIN + 88,
__SIGRTMIN + 89,
__SIGRTMIN + 90,
__SIGRTMIN + 91,
__SIGRTMIN + 92,
__SIGRTMIN + 93,
__SIGRTMIN + 94,
__SIGRTMIN + 95,
-1, /* SIGINFO */
-1, /* UNKNOWN */
-1, /* DEFAULT */
-1,
-1,
-1,
-1,
-1,
-1
#endif
};
#else
/* In system mode we only need SIGINT and SIGTRAP; other signals
are not yet supported. */
enum {
TARGET_SIGINT = 2,
TARGET_SIGTRAP = 5
};
static int gdb_signal_table[] = {
-1,
-1,
TARGET_SIGINT,
-1,
-1,
TARGET_SIGTRAP
};
#endif
#ifdef CONFIG_USER_ONLY
static int target_signal_to_gdb (int sig)
{
int i;
for (i = 0; i < ARRAY_SIZE (gdb_signal_table); i++)
if (gdb_signal_table[i] == sig)
return i;
return GDB_SIGNAL_UNKNOWN;
}
#endif
static int gdb_signal_to_target (int sig)
{
if (sig < ARRAY_SIZE (gdb_signal_table))
return gdb_signal_table[sig];
else
return -1;
}
typedef struct GDBRegisterState {
int base_reg;
int num_regs;
gdb_get_reg_cb get_reg;
gdb_set_reg_cb set_reg;
const char *xml;
struct GDBRegisterState *next;
} GDBRegisterState;
typedef struct GDBProcess {
uint32_t pid;
bool attached;
char target_xml[1024];
} GDBProcess;
enum RSState {
RS_INACTIVE,
RS_IDLE,
RS_GETLINE,
RS_GETLINE_ESC,
RS_GETLINE_RLE,
RS_CHKSUM1,
RS_CHKSUM2,
};
typedef struct GDBState {
bool init; /* have we been initialised? */
CPUState *c_cpu; /* current CPU for step/continue ops */
CPUState *g_cpu; /* current CPU for other ops */
CPUState *query_cpu; /* for q{f|s}ThreadInfo */
enum RSState state; /* parsing state */
char line_buf[MAX_PACKET_LENGTH];
int line_buf_index;
int line_sum; /* running checksum */
int line_csum; /* checksum at the end of the packet */
GByteArray *last_packet;
int signal;
#ifdef CONFIG_USER_ONLY
int fd;
char *socket_path;
int running_state;
#else
CharBackend chr;
Chardev *mon_chr;
#endif
bool multiprocess;
GDBProcess *processes;
int process_num;
char syscall_buf[256];
gdb_syscall_complete_cb current_syscall_cb;
GString *str_buf;
GByteArray *mem_buf;
int sstep_flags;
int supported_sstep_flags;
} GDBState;
static GDBState gdbserver_state;
static void init_gdbserver_state(void)
{
g_assert(!gdbserver_state.init);
memset(&gdbserver_state, 0, sizeof(GDBState));
gdbserver_state.init = true;
gdbserver_state.str_buf = g_string_new(NULL);
gdbserver_state.mem_buf = g_byte_array_sized_new(MAX_PACKET_LENGTH);
gdbserver_state.last_packet = g_byte_array_sized_new(MAX_PACKET_LENGTH + 4);
/*
* In replay mode all events will come from the log and can't be
* suppressed otherwise we would break determinism. However as those
* events are tied to the number of executed instructions we won't see
* them occurring every time we single step.
*/
if (replay_mode != REPLAY_MODE_NONE) {
gdbserver_state.supported_sstep_flags = SSTEP_ENABLE;
} else if (kvm_enabled()) {
gdbserver_state.supported_sstep_flags = kvm_get_supported_sstep_flags();
} else {
gdbserver_state.supported_sstep_flags =
SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER;
}
/*
* By default use no IRQs and no timers while single stepping so as to
* make single stepping like an ICE HW step.
*/
gdbserver_state.sstep_flags = SSTEP_ENABLE | SSTEP_NOIRQ | SSTEP_NOTIMER;
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
static int get_char(void)
{
uint8_t ch;
int ret;
for(;;) {
ret = qemu_recv(gdbserver_state.fd, &ch, 1, 0);
if (ret < 0) {
if (errno == ECONNRESET)
gdbserver_state.fd = -1;
if (errno != EINTR)
return -1;
} else if (ret == 0) {
close(gdbserver_state.fd);
gdbserver_state.fd = -1;
return -1;
} else {
break;
}
}
return ch;
}
#endif
static enum {
GDB_SYS_UNKNOWN,
GDB_SYS_ENABLED,
GDB_SYS_DISABLED,
} gdb_syscall_mode;
/* Decide if either remote gdb syscalls or native file IO should be used. */
int use_gdb_syscalls(void)
{
SemihostingTarget target = semihosting_get_target();
if (target == SEMIHOSTING_TARGET_NATIVE) {
/* -semihosting-config target=native */
return false;
} else if (target == SEMIHOSTING_TARGET_GDB) {
/* -semihosting-config target=gdb */
return true;
}
/* -semihosting-config target=auto */
/* On the first call check if gdb is connected and remember. */
if (gdb_syscall_mode == GDB_SYS_UNKNOWN) {
gdb_syscall_mode = gdbserver_state.init ?
GDB_SYS_ENABLED : GDB_SYS_DISABLED;
}
return gdb_syscall_mode == GDB_SYS_ENABLED;
}
static bool stub_can_reverse(void)
{
#ifdef CONFIG_USER_ONLY
return false;
#else
return replay_mode == REPLAY_MODE_PLAY;
#endif
}
/* Resume execution. */
static inline void gdb_continue(void)
{
#ifdef CONFIG_USER_ONLY
gdbserver_state.running_state = 1;
trace_gdbstub_op_continue();
#else
if (!runstate_needs_reset()) {
trace_gdbstub_op_continue();
vm_start();
}
#endif
}
/*
* Resume execution, per CPU actions. For user-mode emulation it's
* equivalent to gdb_continue.
*/
static int gdb_continue_partial(char *newstates)
{
CPUState *cpu;
int res = 0;
#ifdef CONFIG_USER_ONLY
/*
* This is not exactly accurate, but it's an improvement compared to the
* previous situation, where only one CPU would be single-stepped.
*/
CPU_FOREACH(cpu) {
if (newstates[cpu->cpu_index] == 's') {
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, gdbserver_state.sstep_flags);
}
}
gdbserver_state.running_state = 1;
#else
int flag = 0;
if (!runstate_needs_reset()) {
if (vm_prepare_start()) {
return 0;
}
CPU_FOREACH(cpu) {
switch (newstates[cpu->cpu_index]) {
case 0:
case 1:
break; /* nothing to do here */
case 's':
trace_gdbstub_op_stepping(cpu->cpu_index);
cpu_single_step(cpu, gdbserver_state.sstep_flags);
cpu_resume(cpu);
flag = 1;
break;
case 'c':
trace_gdbstub_op_continue_cpu(cpu->cpu_index);
cpu_resume(cpu);
flag = 1;
break;
default:
res = -1;
break;
}
}
}
if (flag) {
qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
}
#endif
return res;
}
static void put_buffer(const uint8_t *buf, int len)
{
#ifdef CONFIG_USER_ONLY
int ret;
while (len > 0) {
ret = send(gdbserver_state.fd, buf, len, 0);
if (ret < 0) {
if (errno != EINTR)
return;
} else {
buf += ret;
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_state.chr, buf, len);
#endif
}
static inline int fromhex(int v)
{
if (v >= '0' && v <= '9')
return v - '0';
else if (v >= 'A' && v <= 'F')
return v - 'A' + 10;
else if (v >= 'a' && v <= 'f')
return v - 'a' + 10;
else
return 0;
}
static inline int tohex(int v)
{
if (v < 10)
return v + '0';
else
return v - 10 + 'a';
}
/* writes 2*len+1 bytes in buf */
static void memtohex(GString *buf, const uint8_t *mem, int len)
{
int i, c;
for(i = 0; i < len; i++) {
c = mem[i];
g_string_append_c(buf, tohex(c >> 4));
g_string_append_c(buf, tohex(c & 0xf));
}
g_string_append_c(buf, '\0');
}
static void hextomem(GByteArray *mem, const char *buf, int len)
{
int i;
for(i = 0; i < len; i++) {
guint8 byte = fromhex(buf[0]) << 4 | fromhex(buf[1]);
g_byte_array_append(mem, &byte, 1);
buf += 2;
}
}
static void hexdump(const char *buf, int len,
void (*trace_fn)(size_t ofs, char const *text))
{
char line_buffer[3 * 16 + 4 + 16 + 1];
size_t i;
for (i = 0; i < len || (i & 0xF); ++i) {
size_t byte_ofs = i & 15;
if (byte_ofs == 0) {
memset(line_buffer, ' ', 3 * 16 + 4 + 16);
line_buffer[3 * 16 + 4 + 16] = 0;
}
size_t col_group = (i >> 2) & 3;
size_t hex_col = byte_ofs * 3 + col_group;
size_t txt_col = 3 * 16 + 4 + byte_ofs;
if (i < len) {
char value = buf[i];
line_buffer[hex_col + 0] = tohex((value >> 4) & 0xF);
line_buffer[hex_col + 1] = tohex((value >> 0) & 0xF);
line_buffer[txt_col + 0] = (value >= ' ' && value < 127)
? value
: '.';
}
if (byte_ofs == 0xF)
trace_fn(i & -16, line_buffer);
}
}
/* return -1 if error, 0 if OK */
static int put_packet_binary(const char *buf, int len, bool dump)
{
int csum, i;
uint8_t footer[3];
if (dump && trace_event_get_state_backends(TRACE_GDBSTUB_IO_BINARYREPLY)) {
hexdump(buf, len, trace_gdbstub_io_binaryreply);
}
for(;;) {
g_byte_array_set_size(gdbserver_state.last_packet, 0);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) "$", 1);
g_byte_array_append(gdbserver_state.last_packet,
(const uint8_t *) buf, len);
csum = 0;
for(i = 0; i < len; i++) {
csum += buf[i];
}
footer[0] = '#';
footer[1] = tohex((csum >> 4) & 0xf);
footer[2] = tohex((csum) & 0xf);
g_byte_array_append(gdbserver_state.last_packet, footer, 3);
put_buffer(gdbserver_state.last_packet->data,
gdbserver_state.last_packet->len);
#ifdef CONFIG_USER_ONLY
i = get_char();
if (i < 0)
return -1;
if (i == '+')
break;
#else
break;
#endif
}
return 0;
}
/* return -1 if error, 0 if OK */
static int put_packet(const char *buf)
{
trace_gdbstub_io_reply(buf);
return put_packet_binary(buf, strlen(buf), false);
}
static void put_strbuf(void)
{
put_packet(gdbserver_state.str_buf->str);
}
/* Encode data using the encoding for 'x' packets. */
static void memtox(GString *buf, const char *mem, int len)
{
char c;
while (len--) {
c = *(mem++);
switch (c) {
case '#': case '$': case '*': case '}':
g_string_append_c(buf, '}');
g_string_append_c(buf, c ^ 0x20);
break;
default:
g_string_append_c(buf, c);
break;
}
}
}
static uint32_t gdb_get_cpu_pid(CPUState *cpu)
{
/* TODO: In user mode, we should use the task state PID */
if (cpu->cluster_index == UNASSIGNED_CLUSTER_INDEX) {
/* Return the default process' PID */
int index = gdbserver_state.process_num - 1;
return gdbserver_state.processes[index].pid;
}
return cpu->cluster_index + 1;
}
static GDBProcess *gdb_get_process(uint32_t pid)
{
int i;
if (!pid) {
/* 0 means any process, we take the first one */
return &gdbserver_state.processes[0];
}
for (i = 0; i < gdbserver_state.process_num; i++) {
if (gdbserver_state.processes[i].pid == pid) {
return &gdbserver_state.processes[i];
}
}
return NULL;
}
static GDBProcess *gdb_get_cpu_process(CPUState *cpu)
{
return gdb_get_process(gdb_get_cpu_pid(cpu));
}
static CPUState *find_cpu(uint32_t thread_id)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (cpu_gdb_index(cpu) == thread_id) {
return cpu;
}
}
return NULL;
}
static CPUState *get_first_cpu_in_process(GDBProcess *process)
{
CPUState *cpu;
CPU_FOREACH(cpu) {
if (gdb_get_cpu_pid(cpu) == process->pid) {
return cpu;
}
}
return NULL;
}
static CPUState *gdb_next_cpu_in_process(CPUState *cpu)
{
uint32_t pid = gdb_get_cpu_pid(cpu);
cpu = CPU_NEXT(cpu);
while (cpu) {
if (gdb_get_cpu_pid(cpu) == pid) {
break;
}
cpu = CPU_NEXT(cpu);
}
return cpu;
}
/* Return the cpu following @cpu, while ignoring unattached processes. */
static CPUState *gdb_next_attached_cpu(CPUState *cpu)
{
cpu = CPU_NEXT(cpu);
while (cpu) {
if (gdb_get_cpu_process(cpu)->attached) {
break;
}
cpu = CPU_NEXT(cpu);
}
return cpu;
}
/* Return the first attached cpu */
static CPUState *gdb_first_attached_cpu(void)
{
CPUState *cpu = first_cpu;
GDBProcess *process = gdb_get_cpu_process(cpu);
if (!process->attached) {
return gdb_next_attached_cpu(cpu);
}
return cpu;
}
static CPUState *gdb_get_cpu(uint32_t pid, uint32_t tid)
{
GDBProcess *process;
CPUState *cpu;
if (!pid && !tid) {
/* 0 means any process/thread, we take the first attached one */
return gdb_first_attached_cpu();
} else if (pid && !tid) {
/* any thread in a specific process */
process = gdb_get_process(pid);
if (process == NULL) {
return NULL;
}
if (!process->attached) {
return NULL;
}
return get_first_cpu_in_process(process);
} else {
/* a specific thread */
cpu = find_cpu(tid);
if (cpu == NULL) {
return NULL;
}
process = gdb_get_cpu_process(cpu);
if (pid && process->pid != pid) {
return NULL;
}
if (!process->attached) {
return NULL;
}
return cpu;
}
}
static const char *get_feature_xml(const char *p, const char **newp,
GDBProcess *process)
{
size_t len;
int i;
const char *name;
CPUState *cpu = get_first_cpu_in_process(process);
CPUClass *cc = CPU_GET_CLASS(cpu);
len = 0;
while (p[len] && p[len] != ':')
len++;
*newp = p + len;
name = NULL;
if (strncmp(p, "target.xml", len) == 0) {
char *buf = process->target_xml;
const size_t buf_sz = sizeof(process->target_xml);
/* Generate the XML description for this CPU. */
if (!buf[0]) {
GDBRegisterState *r;
pstrcat(buf, buf_sz,
"<?xml version=\"1.0\"?>"
"<!DOCTYPE target SYSTEM \"gdb-target.dtd\">"
"<target>");
if (cc->gdb_arch_name) {
gchar *arch = cc->gdb_arch_name(cpu);
pstrcat(buf, buf_sz, "<architecture>");
pstrcat(buf, buf_sz, arch);
pstrcat(buf, buf_sz, "</architecture>");
g_free(arch);
}
pstrcat(buf, buf_sz, "<xi:include href=\"");
pstrcat(buf, buf_sz, cc->gdb_core_xml_file);
pstrcat(buf, buf_sz, "\"/>");
for (r = cpu->gdb_regs; r; r = r->next) {
pstrcat(buf, buf_sz, "<xi:include href=\"");
pstrcat(buf, buf_sz, r->xml);
pstrcat(buf, buf_sz, "\"/>");
}
pstrcat(buf, buf_sz, "</target>");
}
return buf;
}
if (cc->gdb_get_dynamic_xml) {
char *xmlname = g_strndup(p, len);
const char *xml = cc->gdb_get_dynamic_xml(cpu, xmlname);
g_free(xmlname);
if (xml) {
return xml;
}
}
for (i = 0; ; i++) {
name = xml_builtin[i][0];
if (!name || (strncmp(name, p, len) == 0 && strlen(name) == len))
break;
}
return name ? xml_builtin[i][1] : NULL;
}
static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_read_register(cpu, buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->get_reg(env, buf, reg - r->base_reg);
}
}
return 0;
}
static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
{
CPUClass *cc = CPU_GET_CLASS(cpu);
CPUArchState *env = cpu->env_ptr;
GDBRegisterState *r;
if (reg < cc->gdb_num_core_regs) {
return cc->gdb_write_register(cpu, mem_buf, reg);
}
for (r = cpu->gdb_regs; r; r = r->next) {
if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
return r->set_reg(env, mem_buf, reg - r->base_reg);
}
}
return 0;
}
/* Register a supplemental set of CPU registers. If g_pos is nonzero it
specifies the first register number and these registers are included in
a standard "g" packet. Direction is relative to gdb, i.e. get_reg is
gdb reading a CPU register, and set_reg is gdb modifying a CPU register.
*/
void gdb_register_coprocessor(CPUState *cpu,
gdb_get_reg_cb get_reg, gdb_set_reg_cb set_reg,
int num_regs, const char *xml, int g_pos)
{
GDBRegisterState *s;
GDBRegisterState **p;
p = &cpu->gdb_regs;
while (*p) {
/* Check for duplicates. */
if (strcmp((*p)->xml, xml) == 0)
return;
p = &(*p)->next;
}
s = g_new0(GDBRegisterState, 1);
s->base_reg = cpu->gdb_num_regs;
s->num_regs = num_regs;
s->get_reg = get_reg;
s->set_reg = set_reg;
s->xml = xml;
/* Add to end of list. */
cpu->gdb_num_regs += num_regs;
*p = s;
if (g_pos) {
if (g_pos != s->base_reg) {
error_report("Error: Bad gdb register numbering for '%s', "
"expected %d got %d", xml, g_pos, s->base_reg);
} else {
cpu->gdb_num_g_regs = cpu->gdb_num_regs;
}
}
}
#ifndef CONFIG_USER_ONLY
/* Translate GDB watchpoint type to a flags value for cpu_watchpoint_* */
static inline int xlat_gdb_type(CPUState *cpu, int gdbtype)
{
static const int xlat[] = {
[GDB_WATCHPOINT_WRITE] = BP_GDB | BP_MEM_WRITE,
[GDB_WATCHPOINT_READ] = BP_GDB | BP_MEM_READ,
[GDB_WATCHPOINT_ACCESS] = BP_GDB | BP_MEM_ACCESS,
};
CPUClass *cc = CPU_GET_CLASS(cpu);
int cputype = xlat[gdbtype];
if (cc->gdb_stop_before_watchpoint) {
cputype |= BP_STOP_BEFORE_ACCESS;
}
return cputype;
}
#endif
static int gdb_breakpoint_insert(int type, target_ulong addr, target_ulong len)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_insert_breakpoint(gdbserver_state.c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_insert(cpu, addr, BP_GDB, NULL);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_insert(cpu, addr, len,
xlat_gdb_type(cpu, type), NULL);
if (err) {
break;
}
}
return err;
#endif
default:
return -ENOSYS;
}
}
static int gdb_breakpoint_remove(int type, target_ulong addr, target_ulong len)
{
CPUState *cpu;
int err = 0;
if (kvm_enabled()) {
return kvm_remove_breakpoint(gdbserver_state.c_cpu, addr, len, type);
}
switch (type) {
case GDB_BREAKPOINT_SW:
case GDB_BREAKPOINT_HW:
CPU_FOREACH(cpu) {
err = cpu_breakpoint_remove(cpu, addr, BP_GDB);
if (err) {
break;
}
}
return err;
#ifndef CONFIG_USER_ONLY
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_READ:
case GDB_WATCHPOINT_ACCESS:
CPU_FOREACH(cpu) {
err = cpu_watchpoint_remove(cpu, addr, len,
xlat_gdb_type(cpu, type));
if (err)
break;
}
return err;
#endif
default:
return -ENOSYS;
}
}
static inline void gdb_cpu_breakpoint_remove_all(CPUState *cpu)
{
cpu_breakpoint_remove_all(cpu, BP_GDB);
#ifndef CONFIG_USER_ONLY
cpu_watchpoint_remove_all(cpu, BP_GDB);
#endif
}
static void gdb_process_breakpoint_remove_all(GDBProcess *p)
{
CPUState *cpu = get_first_cpu_in_process(p);
while (cpu) {
gdb_cpu_breakpoint_remove_all(cpu);
cpu = gdb_next_cpu_in_process(cpu);
}
}
static void gdb_breakpoint_remove_all(void)
{
CPUState *cpu;
if (kvm_enabled()) {
kvm_remove_all_breakpoints(gdbserver_state.c_cpu);
return;
}
CPU_FOREACH(cpu) {
gdb_cpu_breakpoint_remove_all(cpu);
}
}
static void gdb_set_cpu_pc(target_ulong pc)
{
CPUState *cpu = gdbserver_state.c_cpu;
cpu_synchronize_state(cpu);
cpu_set_pc(cpu, pc);
}
static void gdb_append_thread_id(CPUState *cpu, GString *buf)
{
if (gdbserver_state.multiprocess) {
g_string_append_printf(buf, "p%02x.%02x",
gdb_get_cpu_pid(cpu), cpu_gdb_index(cpu));
} else {
g_string_append_printf(buf, "%02x", cpu_gdb_index(cpu));
}
}
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)
{
unsigned long p, t;
int ret;
if (*buf == 'p') {
buf++;
ret = qemu_strtoul(buf, &buf, 16, &p);
if (ret) {
return GDB_READ_THREAD_ERR;
}
/* Skip '.' */
buf++;
} else {
p = 1;
}
ret = qemu_strtoul(buf, &buf, 16, &t);
if (ret) {
return GDB_READ_THREAD_ERR;
}
*end_buf = buf;
if (p == -1) {
return GDB_ALL_PROCESSES;
}
if (pid) {
*pid = p;
}
if (t == -1) {
return GDB_ALL_THREADS;
}
if (tid) {
*tid = t;
}
return GDB_ONE_THREAD;
}
/**
* gdb_handle_vcont - Parses and handles a vCont packet.
* returns -ENOTSUP if a command is unsupported, -EINVAL or -ERANGE if there is
* a format error, 0 on success.
*/
static int gdb_handle_vcont(const char *p)
{
int res, signal = 0;
char cur_action;
char *newstates;
unsigned long tmp;
uint32_t pid, tid;
GDBProcess *process;
CPUState *cpu;
GDBThreadIdKind kind;
#ifdef CONFIG_USER_ONLY
int max_cpus = 1; /* global variable max_cpus exists only in system mode */
CPU_FOREACH(cpu) {
max_cpus = max_cpus <= cpu->cpu_index ? cpu->cpu_index + 1 : max_cpus;
}
#else
MachineState *ms = MACHINE(qdev_get_machine());
unsigned int max_cpus = ms->smp.max_cpus;
#endif
/* uninitialised CPUs stay 0 */
newstates = g_new0(char, max_cpus);
/* mark valid CPUs with 1 */
CPU_FOREACH(cpu) {
newstates[cpu->cpu_index] = 1;
}
/*
* res keeps track of what error we are returning, with -ENOTSUP meaning
* that the command is unknown or unsupported, thus returning an empty
* packet, while -EINVAL and -ERANGE cause an E22 packet, due to invalid,
* or incorrect parameters passed.
*/
res = 0;
while (*p) {
if (*p++ != ';') {
res = -ENOTSUP;
goto out;
}
cur_action = *p++;
if (cur_action == 'C' || cur_action == 'S') {
cur_action = qemu_tolower(cur_action);
res = qemu_strtoul(p, &p, 16, &tmp);
if (res) {
goto out;
}
signal = gdb_signal_to_target(tmp);
} else if (cur_action != 'c' && cur_action != 's') {
/* unknown/invalid/unsupported command */
res = -ENOTSUP;
goto out;
}
if (*p == '\0' || *p == ';') {
/*
* No thread specifier, action is on "all threads". The
* specification is unclear regarding the process to act on. We
* choose all processes.
*/
kind = GDB_ALL_PROCESSES;
} else if (*p++ == ':') {
kind = read_thread_id(p, &p, &pid, &tid);
} else {
res = -ENOTSUP;
goto out;
}
switch (kind) {
case GDB_READ_THREAD_ERR:
res = -EINVAL;
goto out;
case GDB_ALL_PROCESSES:
cpu = gdb_first_attached_cpu();
while (cpu) {
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;
}
cpu = gdb_next_attached_cpu(cpu);
}
break;
case GDB_ALL_THREADS:
process = gdb_get_process(pid);
if (!process->attached) {
res = -EINVAL;
goto out;
}
cpu = get_first_cpu_in_process(process);
while (cpu) {
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;
}
cpu = gdb_next_cpu_in_process(cpu);
}
break;
case GDB_ONE_THREAD:
cpu = gdb_get_cpu(pid, tid);
/* invalid CPU/thread specified */
if (!cpu) {
res = -EINVAL;
goto out;
}
/* only use if no previous match occourred */
if (newstates[cpu->cpu_index] == 1) {
newstates[cpu->cpu_index] = cur_action;
}
break;
}
}
gdbserver_state.signal = signal;
gdb_continue_partial(newstates);
out:
g_free(newstates);
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[] = ",;:=";
char curr_delimiters[2] = {0};
const char *delimiters;
if (delimiter == '?') {
delimiters = all_delimiters;
} else if (delimiter == '0') {
return strchr(param, '\0');
} else if (delimiter == '.' && *param) {
return param + 1;
} else {
curr_delimiters[0] = delimiter;
delimiters = curr_delimiters;
}
param += strcspn(param, delimiters);
if (*param) {
param++;
}
return param;
}
static int cmd_parse_params(const char *data, const char *schema,
GArray *params)
{
const char *curr_schema, *curr_data;
g_assert(schema);
g_assert(params->len == 0);
curr_schema = schema;
curr_data = data;
while (curr_schema[0] && curr_schema[1] && *curr_data) {
GdbCmdVariant this_param;
switch (curr_schema[0]) {
case 'l':
if (qemu_strtoul(curr_data, &curr_data, 16,
&this_param.val_ul)) {
return -EINVAL;
}
curr_data = cmd_next_param(curr_data, curr_schema[1]);
g_array_append_val(params, this_param);
break;
case 'L':
if (qemu_strtou64(curr_data, &curr_data, 16,
(uint64_t *)&this_param.val_ull)) {
return -EINVAL;
}
curr_data = cmd_next_param(curr_data, curr_schema[1]);
g_array_append_val(params, this_param);
break;
case 's':
this_param.data = curr_data;
curr_data = cmd_next_param(curr_data, curr_schema[1]);
g_array_append_val(params, this_param);
break;
case 'o':
this_param.opcode = *(uint8_t *)curr_data;
curr_data = cmd_next_param(curr_data, curr_schema[1]);
g_array_append_val(params, this_param);
break;
case 't':
this_param.thread_id.kind =
read_thread_id(curr_data, &curr_data,
&this_param.thread_id.pid,
&this_param.thread_id.tid);
curr_data = cmd_next_param(curr_data, curr_schema[1]);
g_array_append_val(params, this_param);
break;
case '?':
curr_data = cmd_next_param(curr_data, curr_schema[1]);
break;
default:
return -EINVAL;
}
curr_schema += 2;
}
return 0;
}
typedef void (*GdbCmdHandler)(GArray *params, void *user_ctx);
/*
* cmd_startswith -> cmd is compared using startswith
*
*
* schema definitions:
* Each schema parameter entry consists of 2 chars,
* the first char represents the parameter type handling
* the second char represents the delimiter for the next parameter
*
* Currently supported schema types:
* 'l' -> unsigned long (stored in .val_ul)
* 'L' -> unsigned long long (stored in .val_ull)
* 's' -> string (stored in .data)
* 'o' -> single char (stored in .opcode)
* 't' -> thread id (stored in .thread_id)
* '?' -> skip according to delimiter
*
* Currently supported delimiters:
* '?' -> Stop at any delimiter (",;:=\0")
* '0' -> Stop at "\0"
* '.' -> Skip 1 char unless reached "\0"
* Any other value is treated as the delimiter value itself
*/
typedef struct GdbCmdParseEntry {
GdbCmdHandler handler;
const char *cmd;
bool cmd_startswith;
const char *schema;
} GdbCmdParseEntry;
static inline int startswith(const char *string, const char *pattern)
{
return !strncmp(string, pattern, strlen(pattern));
}
static int process_string_cmd(void *user_ctx, const char *data,
const GdbCmdParseEntry *cmds, int num_cmds)
{
int i;
g_autoptr(GArray) params = g_array_new(false, true, sizeof(GdbCmdVariant));
if (!cmds) {
return -1;
}
for (i = 0; i < num_cmds; i++) {
const GdbCmdParseEntry *cmd = &cmds[i];
g_assert(cmd->handler && cmd->cmd);
if ((cmd->cmd_startswith && !startswith(data, cmd->cmd)) ||
(!cmd->cmd_startswith && strcmp(cmd->cmd, data))) {
continue;
}
if (cmd->schema) {
if (cmd_parse_params(&data[strlen(cmd->cmd)],
cmd->schema, params)) {
return -1;
}
}
cmd->handler(params, user_ctx);
return 0;
}
return -1;
}
static void run_cmd_parser(const char *data, const GdbCmdParseEntry *cmd)
{
if (!data) {
return;
}
g_string_set_size(gdbserver_state.str_buf, 0);
g_byte_array_set_size(gdbserver_state.mem_buf, 0);
/* In case there was an error during the command parsing we must
* send a NULL packet to indicate the command is not supported */
if (process_string_cmd(NULL, data, cmd, 1)) {
put_packet("");
}
}
static void handle_detach(GArray *params, void *user_ctx)
{
GDBProcess *process;
uint32_t pid = 1;
if (gdbserver_state.multiprocess) {
if (!params->len) {
put_packet("E22");
return;
}
pid = get_param(params, 0)->val_ul;
}
process = gdb_get_process(pid);
gdb_process_breakpoint_remove_all(process);
process->attached = false;
if (pid == gdb_get_cpu_pid(gdbserver_state.c_cpu)) {
gdbserver_state.c_cpu = gdb_first_attached_cpu();
}
if (pid == gdb_get_cpu_pid(gdbserver_state.g_cpu)) {
gdbserver_state.g_cpu = gdb_first_attached_cpu();
}
if (!gdbserver_state.c_cpu) {
/* No more process attached */
gdb_syscall_mode = GDB_SYS_DISABLED;
gdb_continue();
}
put_packet("OK");
}
static void handle_thread_alive(GArray *params, void *user_ctx)
{
CPUState *cpu;
if (!params->len) {
put_packet("E22");
return;
}
if (get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) {
put_packet("E22");
return;
}
cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid,
get_param(params, 0)->thread_id.tid);
if (!cpu) {
put_packet("E22");
return;
}
put_packet("OK");
}
static void handle_continue(GArray *params, void *user_ctx)
{
if (params->len) {
gdb_set_cpu_pc(get_param(params, 0)->val_ull);
}
gdbserver_state.signal = 0;
gdb_continue();
}
static void handle_cont_with_sig(GArray *params, void *user_ctx)
{
unsigned long signal = 0;
/*
* Note: C sig;[addr] is currently unsupported and we simply
* omit the addr parameter
*/
if (params->len) {
signal = get_param(params, 0)->val_ul;
}
gdbserver_state.signal = gdb_signal_to_target(signal);
if (gdbserver_state.signal == -1) {
gdbserver_state.signal = 0;
}
gdb_continue();
}
static void handle_set_thread(GArray *params, void *user_ctx)
{
CPUState *cpu;
if (params->len != 2) {
put_packet("E22");
return;
}
if (get_param(params, 1)->thread_id.kind == GDB_READ_THREAD_ERR) {
put_packet("E22");
return;
}
if (get_param(params, 1)->thread_id.kind != GDB_ONE_THREAD) {
put_packet("OK");
return;
}
cpu = gdb_get_cpu(get_param(params, 1)->thread_id.pid,
get_param(params, 1)->thread_id.tid);
if (!cpu) {
put_packet("E22");
return;
}
/*
* Note: This command is deprecated and modern gdb's will be using the
* vCont command instead.
*/
switch (get_param(params, 0)->opcode) {
case 'c':
gdbserver_state.c_cpu = cpu;
put_packet("OK");
break;
case 'g':
gdbserver_state.g_cpu = cpu;
put_packet("OK");
break;
default:
put_packet("E22");
break;
}
}
static void handle_insert_bp(GArray *params, void *user_ctx)
{
int res;
if (params->len != 3) {
put_packet("E22");
return;
}
res = gdb_breakpoint_insert(get_param(params, 0)->val_ul,
get_param(params, 1)->val_ull,
get_param(params, 2)->val_ull);
if (res >= 0) {
put_packet("OK");
return;
} else if (res == -ENOSYS) {
put_packet("");
return;
}
put_packet("E22");
}
static void handle_remove_bp(GArray *params, void *user_ctx)
{
int res;
if (params->len != 3) {
put_packet("E22");
return;
}
res = gdb_breakpoint_remove(get_param(params, 0)->val_ul,
get_param(params, 1)->val_ull,
get_param(params, 2)->val_ull);
if (res >= 0) {
put_packet("OK");
return;
} else if (res == -ENOSYS) {
put_packet("");
return;
}
put_packet("E22");
}
/*
* handle_set/get_reg
*
* Older gdb are really dumb, and don't use 'G/g' if 'P/p' is available.
* This works, but can be very slow. Anything new enough to understand
* XML also knows how to use this properly. However to use this we
* need to define a local XML file as well as be talking to a
* reasonably modern gdb. Responding with an empty packet will cause
* the remote gdb to fallback to older methods.
*/
static void handle_set_reg(GArray *params, void *user_ctx)
{
int reg_size;
if (!gdb_has_xml) {
put_packet("");
return;
}
if (params->len != 2) {
put_packet("E22");
return;
}
reg_size = strlen(get_param(params, 1)->data) / 2;
hextomem(gdbserver_state.mem_buf, get_param(params, 1)->data, reg_size);
gdb_write_register(gdbserver_state.g_cpu, gdbserver_state.mem_buf->data,
get_param(params, 0)->val_ull);
put_packet("OK");
}
static void handle_get_reg(GArray *params, void *user_ctx)
{
int reg_size;
if (!gdb_has_xml) {
put_packet("");
return;
}
if (!params->len) {
put_packet("E14");
return;
}
reg_size = gdb_read_register(gdbserver_state.g_cpu,
gdbserver_state.mem_buf,
get_param(params, 0)->val_ull);
if (!reg_size) {
put_packet("E14");
return;
} else {
g_byte_array_set_size(gdbserver_state.mem_buf, reg_size);
}
memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, reg_size);
put_strbuf();
}
static void handle_write_mem(GArray *params, void *user_ctx)
{
if (params->len != 3) {
put_packet("E22");
return;
}
/* hextomem() reads 2*len bytes */
if (get_param(params, 1)->val_ull >
strlen(get_param(params, 2)->data) / 2) {
put_packet("E22");
return;
}
hextomem(gdbserver_state.mem_buf, get_param(params, 2)->data,
get_param(params, 1)->val_ull);
if (target_memory_rw_debug(gdbserver_state.g_cpu,
get_param(params, 0)->val_ull,
gdbserver_state.mem_buf->data,
gdbserver_state.mem_buf->len, true)) {
put_packet("E14");
return;
}
put_packet("OK");
}
static void handle_read_mem(GArray *params, void *user_ctx)
{
if (params->len != 2) {
put_packet("E22");
return;
}
/* memtohex() doubles the required space */
if (get_param(params, 1)->val_ull > MAX_PACKET_LENGTH / 2) {
put_packet("E22");
return;
}
g_byte_array_set_size(gdbserver_state.mem_buf,
get_param(params, 1)->val_ull);
if (target_memory_rw_debug(gdbserver_state.g_cpu,
get_param(params, 0)->val_ull,
gdbserver_state.mem_buf->data,
gdbserver_state.mem_buf->len, false)) {
put_packet("E14");
return;
}
memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data,
gdbserver_state.mem_buf->len);
put_strbuf();
}
static void handle_write_all_regs(GArray *params, void *user_ctx)
{
target_ulong addr, len;
uint8_t *registers;
int reg_size;
if (!params->len) {
return;
}
cpu_synchronize_state(gdbserver_state.g_cpu);
len = strlen(get_param(params, 0)->data) / 2;
hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len);
registers = gdbserver_state.mem_buf->data;
for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs && len > 0;
addr++) {
reg_size = gdb_write_register(gdbserver_state.g_cpu, registers, addr);
len -= reg_size;
registers += reg_size;
}
put_packet("OK");
}
static void handle_read_all_regs(GArray *params, void *user_ctx)
{
target_ulong addr, len;
cpu_synchronize_state(gdbserver_state.g_cpu);
g_byte_array_set_size(gdbserver_state.mem_buf, 0);
len = 0;
for (addr = 0; addr < gdbserver_state.g_cpu->gdb_num_g_regs; addr++) {
len += gdb_read_register(gdbserver_state.g_cpu,
gdbserver_state.mem_buf,
addr);
}
g_assert(len == gdbserver_state.mem_buf->len);
memtohex(gdbserver_state.str_buf, gdbserver_state.mem_buf->data, len);
put_strbuf();
}
static void handle_file_io(GArray *params, void *user_ctx)
{
if (params->len >= 1 && gdbserver_state.current_syscall_cb) {
target_ulong ret, err;
ret = (target_ulong)get_param(params, 0)->val_ull;
if (params->len >= 2) {
err = (target_ulong)get_param(params, 1)->val_ull;
} else {
err = 0;
}
gdbserver_state.current_syscall_cb(gdbserver_state.c_cpu, ret, err);
gdbserver_state.current_syscall_cb = NULL;
}
if (params->len >= 3 && get_param(params, 2)->opcode == (uint8_t)'C') {
put_packet("T02");
return;
}
gdb_continue();
}
static void handle_step(GArray *params, void *user_ctx)
{
if (params->len) {
gdb_set_cpu_pc((target_ulong)get_param(params, 0)->val_ull);
}
cpu_single_step(gdbserver_state.c_cpu, gdbserver_state.sstep_flags);
gdb_continue();
}
static void handle_backward(GArray *params, void *user_ctx)
{
if (!stub_can_reverse()) {
put_packet("E22");
}
if (params->len == 1) {
switch (get_param(params, 0)->opcode) {
case 's':
if (replay_reverse_step()) {
gdb_continue();
} else {
put_packet("E14");
}
return;
case 'c':
if (replay_reverse_continue()) {
gdb_continue();
} else {
put_packet("E14");
}
return;
}
}
/* Default invalid command */
put_packet("");
}
static void handle_v_cont_query(GArray *params, void *user_ctx)
{
put_packet("vCont;c;C;s;S");
}
static void handle_v_cont(GArray *params, void *user_ctx)
{
int res;
if (!params->len) {
return;
}
res = gdb_handle_vcont(get_param(params, 0)->data);
if ((res == -EINVAL) || (res == -ERANGE)) {
put_packet("E22");
} else if (res) {
put_packet("");
}
}
static void handle_v_attach(GArray *params, void *user_ctx)
{
GDBProcess *process;
CPUState *cpu;
g_string_assign(gdbserver_state.str_buf, "E22");
if (!params->len) {
goto cleanup;
}
process = gdb_get_process(get_param(params, 0)->val_ul);
if (!process) {
goto cleanup;
}
cpu = get_first_cpu_in_process(process);
if (!cpu) {
goto cleanup;
}
process->attached = true;
gdbserver_state.g_cpu = cpu;
gdbserver_state.c_cpu = cpu;
g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
gdb_append_thread_id(cpu, gdbserver_state.str_buf);
g_string_append_c(gdbserver_state.str_buf, ';');
cleanup:
put_strbuf();
}
static void handle_v_kill(GArray *params, void *user_ctx)
{
/* Kill the target */
put_packet("OK");
error_report("QEMU: Terminated via GDBstub");
gdb_exit(0);
exit(0);
}
static const GdbCmdParseEntry gdb_v_commands_table[] = {
/* Order is important if has same prefix */
{
.handler = handle_v_cont_query,
.cmd = "Cont?",
.cmd_startswith = 1
},
{
.handler = handle_v_cont,
.cmd = "Cont",
.cmd_startswith = 1,
.schema = "s0"
},
{
.handler = handle_v_attach,
.cmd = "Attach;",
.cmd_startswith = 1,
.schema = "l0"
},
{
.handler = handle_v_kill,
.cmd = "Kill;",
.cmd_startswith = 1
},
};
static void handle_v_commands(GArray *params, void *user_ctx)
{
if (!params->len) {
return;
}
if (process_string_cmd(NULL, get_param(params, 0)->data,
gdb_v_commands_table,
ARRAY_SIZE(gdb_v_commands_table))) {
put_packet("");
}
}
static void handle_query_qemu_sstepbits(GArray *params, void *user_ctx)
{
g_string_printf(gdbserver_state.str_buf, "ENABLE=%x", SSTEP_ENABLE);
if (gdbserver_state.supported_sstep_flags & SSTEP_NOIRQ) {
g_string_append_printf(gdbserver_state.str_buf, ",NOIRQ=%x",
SSTEP_NOIRQ);
}
if (gdbserver_state.supported_sstep_flags & SSTEP_NOTIMER) {
g_string_append_printf(gdbserver_state.str_buf, ",NOTIMER=%x",
SSTEP_NOTIMER);
}
put_strbuf();
}
static void handle_set_qemu_sstep(GArray *params, void *user_ctx)
{
int new_sstep_flags;
if (!params->len) {
return;
}
new_sstep_flags = get_param(params, 0)->val_ul;
if (new_sstep_flags & ~gdbserver_state.supported_sstep_flags) {
put_packet("E22");
return;
}
gdbserver_state.sstep_flags = new_sstep_flags;
put_packet("OK");
}
static void handle_query_qemu_sstep(GArray *params, void *user_ctx)
{
g_string_printf(gdbserver_state.str_buf, "0x%x",
gdbserver_state.sstep_flags);
put_strbuf();
}
static void handle_query_curr_tid(GArray *params, void *user_ctx)
{
CPUState *cpu;
GDBProcess *process;
/*
* "Current thread" remains vague in the spec, so always return
* the first thread of the current process (gdb returns the
* first thread).
*/
process = gdb_get_cpu_process(gdbserver_state.g_cpu);
cpu = get_first_cpu_in_process(process);
g_string_assign(gdbserver_state.str_buf, "QC");
gdb_append_thread_id(cpu, gdbserver_state.str_buf);
put_strbuf();
}
static void handle_query_threads(GArray *params, void *user_ctx)
{
if (!gdbserver_state.query_cpu) {
put_packet("l");
return;
}
g_string_assign(gdbserver_state.str_buf, "m");
gdb_append_thread_id(gdbserver_state.query_cpu, gdbserver_state.str_buf);
put_strbuf();
gdbserver_state.query_cpu = gdb_next_attached_cpu(gdbserver_state.query_cpu);
}
static void handle_query_first_threads(GArray *params, void *user_ctx)
{
gdbserver_state.query_cpu = gdb_first_attached_cpu();
handle_query_threads(params, user_ctx);
}
static void handle_query_thread_extra(GArray *params, void *user_ctx)
{
g_autoptr(GString) rs = g_string_new(NULL);
CPUState *cpu;
if (!params->len ||
get_param(params, 0)->thread_id.kind == GDB_READ_THREAD_ERR) {
put_packet("E22");
return;
}
cpu = gdb_get_cpu(get_param(params, 0)->thread_id.pid,
get_param(params, 0)->thread_id.tid);
if (!cpu) {
return;
}
cpu_synchronize_state(cpu);
if (gdbserver_state.multiprocess && (gdbserver_state.process_num > 1)) {
/* Print the CPU model and name in multiprocess mode */
ObjectClass *oc = object_get_class(OBJECT(cpu));
const char *cpu_model = object_class_get_name(oc);
const char *cpu_name =
object_get_canonical_path_component(OBJECT(cpu));
g_string_printf(rs, "%s %s [%s]", cpu_model, cpu_name,
cpu->halted ? "halted " : "running");
} else {
g_string_printf(rs, "CPU#%d [%s]", cpu->cpu_index,
cpu->halted ? "halted " : "running");
}
trace_gdbstub_op_extra_info(rs->str);
memtohex(gdbserver_state.str_buf, (uint8_t *)rs->str, rs->len);
put_strbuf();
}
#ifdef CONFIG_USER_ONLY
static void handle_query_offsets(GArray *params, void *user_ctx)
{
TaskState *ts;
ts = gdbserver_state.c_cpu->opaque;
g_string_printf(gdbserver_state.str_buf,
"Text=" TARGET_ABI_FMT_lx
";Data=" TARGET_ABI_FMT_lx
";Bss=" TARGET_ABI_FMT_lx,
ts->info->code_offset,
ts->info->data_offset,
ts->info->data_offset);
put_strbuf();
}
#else
static void handle_query_rcmd(GArray *params, void *user_ctx)
{
const guint8 zero = 0;
int len;
if (!params->len) {
put_packet("E22");
return;
}
len = strlen(get_param(params, 0)->data);
if (len % 2) {
put_packet("E01");
return;
}
g_assert(gdbserver_state.mem_buf->len == 0);
len = len / 2;
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_state.mon_chr, gdbserver_state.mem_buf->data,
gdbserver_state.mem_buf->len);
put_packet("OK");
}
#endif
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) {
g_string_append(gdbserver_state.str_buf, ";qXfer:features:read+");
}
if (stub_can_reverse()) {
g_string_append(gdbserver_state.str_buf,
";ReverseStep+;ReverseContinue+");
}
#ifdef CONFIG_USER_ONLY
if (gdbserver_state.c_cpu->opaque) {
g_string_append(gdbserver_state.str_buf, ";qXfer:auxv:read+");
}
#endif
if (params->len &&
strstr(get_param(params, 0)->data, "multiprocess+")) {
gdbserver_state.multiprocess = true;
}
g_string_append(gdbserver_state.str_buf, ";vContSupported+;multiprocess+");
put_strbuf();
}
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;
if (params->len < 3) {
put_packet("E22");
return;
}
process = gdb_get_cpu_process(gdbserver_state.g_cpu);
cc = CPU_GET_CLASS(gdbserver_state.g_cpu);
if (!cc->gdb_core_xml_file) {
put_packet("");
return;
}
gdb_has_xml = true;
p = get_param(params, 0)->data;
xml = get_feature_xml(p, &p, process);
if (!xml) {
put_packet("E00");
return;
}
addr = get_param(params, 1)->val_ul;
len = get_param(params, 2)->val_ul;
total_len = strlen(xml);
if (addr > total_len) {
put_packet("E00");
return;
}
if (len > (MAX_PACKET_LENGTH - 5) / 2) {
len = (MAX_PACKET_LENGTH - 5) / 2;
}
if (len < total_len - addr) {
g_string_assign(gdbserver_state.str_buf, "m");
memtox(gdbserver_state.str_buf, xml + addr, len);
} else {
g_string_assign(gdbserver_state.str_buf, "l");
memtox(gdbserver_state.str_buf, xml + addr, total_len - addr);
}
put_packet_binary(gdbserver_state.str_buf->str,
gdbserver_state.str_buf->len, true);
}
#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)
static void handle_query_xfer_auxv(GArray *params, void *user_ctx)
{
TaskState *ts;
unsigned long offset, len, saved_auxv, auxv_len;
if (params->len < 2) {
put_packet("E22");
return;
}
offset = get_param(params, 0)->val_ul;
len = get_param(params, 1)->val_ul;
ts = gdbserver_state.c_cpu->opaque;
saved_auxv = ts->info->saved_auxv;
auxv_len = ts->info->auxv_len;
if (offset >= auxv_len) {
put_packet("E00");
return;
}
if (len > (MAX_PACKET_LENGTH - 5) / 2) {
len = (MAX_PACKET_LENGTH - 5) / 2;
}
if (len < auxv_len - offset) {
g_string_assign(gdbserver_state.str_buf, "m");
} else {
g_string_assign(gdbserver_state.str_buf, "l");
len = auxv_len - offset;
}
g_byte_array_set_size(gdbserver_state.mem_buf, len);
if (target_memory_rw_debug(gdbserver_state.g_cpu, saved_auxv + offset,
gdbserver_state.mem_buf->data, len, false)) {
put_packet("E14");
return;
}
memtox(gdbserver_state.str_buf,
(const char *)gdbserver_state.mem_buf->data, len);
put_packet_binary(gdbserver_state.str_buf->str,
gdbserver_state.str_buf->len, true);
}
#endif
static void handle_query_attached(GArray *params, void *user_ctx)
{
put_packet(GDB_ATTACHED);
}
static void handle_query_qemu_supported(GArray *params, void *user_ctx)
{
g_string_printf(gdbserver_state.str_buf, "sstepbits;sstep");
#ifndef CONFIG_USER_ONLY
g_string_append(gdbserver_state.str_buf, ";PhyMemMode");
#endif
put_strbuf();
}
#ifndef CONFIG_USER_ONLY
static void handle_query_qemu_phy_mem_mode(GArray *params,
void *user_ctx)
{
g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode);
put_strbuf();
}
static void handle_set_qemu_phy_mem_mode(GArray *params, void *user_ctx)
{
if (!params->len) {
put_packet("E22");
return;
}
if (!get_param(params, 0)->val_ul) {
phy_memory_mode = 0;
} else {
phy_memory_mode = 1;
}
put_packet("OK");
}
#endif
static const GdbCmdParseEntry gdb_gen_query_set_common_table[] = {
/* Order is important if has same prefix */
{
.handler = handle_query_qemu_sstepbits,
.cmd = "qemu.sstepbits",
},
{
.handler = handle_query_qemu_sstep,
.cmd = "qemu.sstep",
},
{
.handler = handle_set_qemu_sstep,
.cmd = "qemu.sstep=",
.cmd_startswith = 1,
.schema = "l0"
},
};
static const GdbCmdParseEntry gdb_gen_query_table[] = {
{
.handler = handle_query_curr_tid,
.cmd = "C",
},
{
.handler = handle_query_threads,
.cmd = "sThreadInfo",
},
{
.handler = handle_query_first_threads,
.cmd = "fThreadInfo",
},
{
.handler = handle_query_thread_extra,
.cmd = "ThreadExtraInfo,",
.cmd_startswith = 1,
.schema = "t0"
},
#ifdef CONFIG_USER_ONLY
{
.handler = handle_query_offsets,
.cmd = "Offsets",
},
#else
{
.handler = handle_query_rcmd,
.cmd = "Rcmd,",
.cmd_startswith = 1,
.schema = "s0"
},
#endif
{
.handler = handle_query_supported,
.cmd = "Supported:",
.cmd_startswith = 1,
.schema = "s0"
},
{
.handler = handle_query_supported,
.cmd = "Supported",
.schema = "s0"
},
{
.handler = handle_query_xfer_features,
.cmd = "Xfer:features:read:",
.cmd_startswith = 1,
.schema = "s:l,l0"
},
#if defined(CONFIG_USER_ONLY) && defined(CONFIG_LINUX_USER)
{
.handler = handle_query_xfer_auxv,
.cmd = "Xfer:auxv:read::",
.cmd_startswith = 1,
.schema = "l,l0"
},
#endif
{
.handler = handle_query_attached,
.cmd = "Attached:",
.cmd_startswith = 1
},
{
.handler = handle_query_attached,
.cmd = "Attached",
},
{
.handler = handle_query_qemu_supported,
.cmd = "qemu.Supported",
},
#ifndef CONFIG_USER_ONLY
{
.handler = handle_query_qemu_phy_mem_mode,
.cmd = "qemu.PhyMemMode",
},
#endif
};
static const GdbCmdParseEntry gdb_gen_set_table[] = {
/* Order is important if has same prefix */
{
.handler = handle_set_qemu_sstep,
.cmd = "qemu.sstep:",
.cmd_startswith = 1,
.schema = "l0"
},
#ifndef CONFIG_USER_ONLY
{
.handler = handle_set_qemu_phy_mem_mode,
.cmd = "qemu.PhyMemMode:",
.cmd_startswith = 1,
.schema = "l0"
},
#endif
};
static void handle_gen_query(GArray *params, void *user_ctx)
{
if (!params->len) {
return;
}
if (!process_string_cmd(NULL, get_param(params, 0)->data,
gdb_gen_query_set_common_table,
ARRAY_SIZE(gdb_gen_query_set_common_table))) {
return;
}
if (process_string_cmd(NULL, get_param(params, 0)->data,
gdb_gen_query_table,
ARRAY_SIZE(gdb_gen_query_table))) {
put_packet("");
}
}
static void handle_gen_set(GArray *params, void *user_ctx)
{
if (!params->len) {
return;
}
if (!process_string_cmd(NULL, get_param(params, 0)->data,
gdb_gen_query_set_common_table,
ARRAY_SIZE(gdb_gen_query_set_common_table))) {
return;
}
if (process_string_cmd(NULL, get_param(params, 0)->data,
gdb_gen_set_table,
ARRAY_SIZE(gdb_gen_set_table))) {
put_packet("");
}
}
static void handle_target_halt(GArray *params, void *user_ctx)
{
g_string_printf(gdbserver_state.str_buf, "T%02xthread:", GDB_SIGNAL_TRAP);
gdb_append_thread_id(gdbserver_state.c_cpu, gdbserver_state.str_buf);
g_string_append_c(gdbserver_state.str_buf, ';');
put_strbuf();
/*
* Remove all the breakpoints when this query is issued,
* because gdb is doing an initial connect and the state
* should be cleaned up.
*/
gdb_breakpoint_remove_all();
}
static int gdb_handle_packet(const char *line_buf)
{
const GdbCmdParseEntry *cmd_parser = NULL;
trace_gdbstub_io_command(line_buf);
switch (line_buf[0]) {
case '!':
put_packet("OK");
break;
case '?':
{
static const GdbCmdParseEntry target_halted_cmd_desc = {
.handler = handle_target_halt,
.cmd = "?",
.cmd_startswith = 1
};
cmd_parser = &target_halted_cmd_desc;
}
break;
case 'c':
{
static const GdbCmdParseEntry continue_cmd_desc = {
.handler = handle_continue,
.cmd = "c",
.cmd_startswith = 1,
.schema = "L0"
};
cmd_parser = &continue_cmd_desc;
}
break;
case 'C':
{
static const GdbCmdParseEntry cont_with_sig_cmd_desc = {
.handler = handle_cont_with_sig,
.cmd = "C",
.cmd_startswith = 1,
.schema = "l0"
};
cmd_parser = &cont_with_sig_cmd_desc;
}
break;
case 'v':
{
static const GdbCmdParseEntry v_cmd_desc = {
.handler = handle_v_commands,
.cmd = "v",
.cmd_startswith = 1,
.schema = "s0"
};
cmd_parser = &v_cmd_desc;
}
break;
case 'k':
/* Kill the target */
error_report("QEMU: Terminated via GDBstub");
gdb_exit(0);
exit(0);
case 'D':
{
static const GdbCmdParseEntry detach_cmd_desc = {
.handler = handle_detach,
.cmd = "D",
.cmd_startswith = 1,
.schema = "?.l0"
};
cmd_parser = &detach_cmd_desc;
}
break;
case 's':
{
static const GdbCmdParseEntry step_cmd_desc = {
.handler = handle_step,
.cmd = "s",
.cmd_startswith = 1,
.schema = "L0"
};
cmd_parser = &step_cmd_desc;
}
break;
case 'b':
{
static const GdbCmdParseEntry backward_cmd_desc = {
.handler = handle_backward,
.cmd = "b",
.cmd_startswith = 1,
.schema = "o0"
};
cmd_parser = &backward_cmd_desc;
}
break;
case 'F':
{
static const GdbCmdParseEntry file_io_cmd_desc = {
.handler = handle_file_io,
.cmd = "F",
.cmd_startswith = 1,
.schema = "L,L,o0"
};
cmd_parser = &file_io_cmd_desc;
}
break;
case 'g':
{
static const GdbCmdParseEntry read_all_regs_cmd_desc = {
.handler = handle_read_all_regs,
.cmd = "g",
.cmd_startswith = 1
};
cmd_parser = &read_all_regs_cmd_desc;
}
break;
case 'G':
{
static const GdbCmdParseEntry write_all_regs_cmd_desc = {
.handler = handle_write_all_regs,
.cmd = "G",
.cmd_startswith = 1,
.schema = "s0"
};
cmd_parser = &write_all_regs_cmd_desc;
}
break;
case 'm':
{
static const GdbCmdParseEntry read_mem_cmd_desc = {
.handler = handle_read_mem,
.cmd = "m",
.cmd_startswith = 1,
.schema = "L,L0"
};
cmd_parser = &read_mem_cmd_desc;
}
break;
case 'M':
{
static const GdbCmdParseEntry write_mem_cmd_desc = {
.handler = handle_write_mem,
.cmd = "M",
.cmd_startswith = 1,
.schema = "L,L:s0"
};
cmd_parser = &write_mem_cmd_desc;
}
break;
case 'p':
{
static const GdbCmdParseEntry get_reg_cmd_desc = {
.handler = handle_get_reg,
.cmd = "p",
.cmd_startswith = 1,
.schema = "L0"
};
cmd_parser = &get_reg_cmd_desc;
}
break;
case 'P':
{
static const GdbCmdParseEntry set_reg_cmd_desc = {
.handler = handle_set_reg,
.cmd = "P",
.cmd_startswith = 1,
.schema = "L?s0"
};
cmd_parser = &set_reg_cmd_desc;
}
break;
case 'Z':
{
static const GdbCmdParseEntry insert_bp_cmd_desc = {
.handler = handle_insert_bp,
.cmd = "Z",
.cmd_startswith = 1,
.schema = "l?L?L0"
};
cmd_parser = &insert_bp_cmd_desc;
}
break;
case 'z':
{
static const GdbCmdParseEntry remove_bp_cmd_desc = {
.handler = handle_remove_bp,
.cmd = "z",
.cmd_startswith = 1,
.schema = "l?L?L0"
};
cmd_parser = &remove_bp_cmd_desc;
}
break;
case 'H':
{
static const GdbCmdParseEntry set_thread_cmd_desc = {
.handler = handle_set_thread,
.cmd = "H",
.cmd_startswith = 1,
.schema = "o.t0"
};
cmd_parser = &set_thread_cmd_desc;
}
break;
case 'T':
{
static const GdbCmdParseEntry thread_alive_cmd_desc = {
.handler = handle_thread_alive,
.cmd = "T",
.cmd_startswith = 1,
.schema = "t0"
};
cmd_parser = &thread_alive_cmd_desc;
}
break;
case 'q':
{
static const GdbCmdParseEntry gen_query_cmd_desc = {
.handler = handle_gen_query,
.cmd = "q",
.cmd_startswith = 1,
.schema = "s0"
};
cmd_parser = &gen_query_cmd_desc;
}
break;
case 'Q':
{
static const GdbCmdParseEntry gen_set_cmd_desc = {
.handler = handle_gen_set,
.cmd = "Q",
.cmd_startswith = 1,
.schema = "s0"
};
cmd_parser = &gen_set_cmd_desc;
}
break;
default:
/* put empty packet */
put_packet("");
break;
}
if (cmd_parser) {
run_cmd_parser(line_buf, cmd_parser);
}
return RS_IDLE;
}
void gdb_set_stop_cpu(CPUState *cpu)
{
GDBProcess *p = gdb_get_cpu_process(cpu);
if (!p->attached) {
/*
* Having a stop CPU corresponding to a process that is not attached
* confuses GDB. So we ignore the request.
*/
return;
}
gdbserver_state.c_cpu = 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) {
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, cpu_gdb_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:
put_packet(buf->str);
/* disable single step if it was enabled */
cpu_single_step(cpu, 0);
}
#endif
/* Send a gdb syscall request.