+ }
+ cpu_single_step(env, 1);
+ vm_start();
+ break;
+ case 'g':
+ reg_size = cpu_gdb_read_registers(env, mem_buf);
+ memtohex(buf, mem_buf, reg_size);
+ put_packet(s, buf);
+ break;
+ case 'G':
+ registers = (void *)mem_buf;
+ len = strlen(p) / 2;
+ hextomem((uint8_t *)registers, p, len);
+ cpu_gdb_write_registers(env, mem_buf, len);
+ put_packet(s, "OK");
+ break;
+ case 'm':
+ addr = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ len = strtoul(p, NULL, 16);
+ if (cpu_memory_rw_debug(env, addr, mem_buf, len, 0) != 0)
+ memset(mem_buf, 0, len);
+ memtohex(buf, mem_buf, len);
+ put_packet(s, buf);
+ break;
+ case 'M':
+ addr = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ len = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ hextomem(mem_buf, p, len);
+ if (cpu_memory_rw_debug(env, addr, mem_buf, len, 1) != 0)
+ put_packet(s, "ENN");
+ else
+ put_packet(s, "OK");
+ break;
+ case 'Z':
+ type = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ addr = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ len = strtoul(p, (char **)&p, 16);
+ if (type == 0 || type == 1) {
+ if (cpu_breakpoint_insert(env, addr) < 0)
+ goto breakpoint_error;
+ put_packet(s, "OK");
+ } else {
+ breakpoint_error:
+ put_packet(s, "ENN");
+ }
+ break;
+ case 'z':
+ type = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ addr = strtoul(p, (char **)&p, 16);
+ if (*p == ',')
+ p++;
+ len = strtoul(p, (char **)&p, 16);
+ if (type == 0 || type == 1) {
+ cpu_breakpoint_remove(env, addr);
+ put_packet(s, "OK");
+ } else {
+ goto breakpoint_error;
+ }
+ break;
+ default:
+ // unknown_command:
+ /* put empty packet */
+ buf[0] = '\0';
+ put_packet(s, buf);
+ break;
+ }
+ return RS_IDLE;
+}
+
+static void gdb_vm_stopped(void *opaque, int reason)
+{
+ GDBState *s = opaque;
+ char buf[256];
+ int ret;
+
+ /* disable single step if it was enable */
+ cpu_single_step(cpu_single_env, 0);
+
+ if (reason == EXCP_DEBUG)
+ ret = SIGTRAP;
+ else
+ ret = 0;
+ snprintf(buf, sizeof(buf), "S%02x", ret);
+ put_packet(s, buf);
+}
+
+static void gdb_read_byte(GDBState *s, int ch)
+{
+ int i, csum;
+ char reply[1];
+
+ if (vm_running) {
+ /* when the CPU is running, we cannot do anything except stop
+ it when receiving a char */
+ vm_stop(EXCP_INTERRUPT);
+ } else {
+ switch(s->state) {
+ case RS_IDLE:
+ if (ch == '$') {
+ s->line_buf_index = 0;
+ s->state = RS_GETLINE;