#include "qemu/error-report.h"
#include "qemu/cutils.h"
#include "exec/gdbstub.h"
+#include "gdbstub/syscalls.h"
#include "exec/hwaddr.h"
#include "exec/tb-flush.h"
#include "sysemu/cpus.h"
g_free(gdbserver_state.processes);
gdbserver_state.processes = NULL;
gdbserver_state.process_num = 0;
+ gdbserver_state.allow_stop_reply = false;
}
/*
return cpu->cpu_index + 1;
}
+/*
+ * We check the status of the last message in the chardev receive code
+ */
+bool gdb_got_immediate_ack(void)
+{
+ return true;
+}
+
/*
* GDB Connection management. For system emulation we do all of this
* via our existing Chardev infrastructure which allows us to support
vm_stop(RUN_STATE_PAUSED);
replay_gdb_attached();
- gdb_has_xml = false;
break;
default:
break;
}
}
+/*
+ * In softmmu mode we stop the VM and wait to send the syscall packet
+ * until notification that the CPU has stopped. This must be done
+ * because if the packet is sent now the reply from the syscall
+ * request could be received while the CPU is still in the running
+ * state, which can cause packets to be dropped and state transition
+ * 'T' packets to be sent while the syscall is still being processed.
+ */
+void gdb_syscall_handling(const char *syscall_packet)
+{
+ vm_stop(RUN_STATE_DEBUG);
+ qemu_cpu_kick(gdbserver_state.c_cpu);
+}
+
static void gdb_vm_state_change(void *opaque, bool running, RunState state)
{
CPUState *cpu = gdbserver_state.c_cpu;
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);
+ if (gdb_handled_syscall()) {
return;
}
return;
}
+ if (!gdbserver_state.allow_stop_reply) {
+ return;
+ }
+
gdb_append_thread_id(cpu, tid);
switch (state) {
send_packet:
gdb_put_packet(buf->str);
+ gdbserver_state.allow_stop_reply = false;
/* disable single step if it was enabled */
cpu_single_step(cpu, 0);
int gdbserver_start(const char *device)
{
- trace_gdbstub_op_start(device);
-
- char gdbstub_device_name[128];
Chardev *chr = NULL;
Chardev *mon_chr;
+ g_autoptr(GString) cs = g_string_new(device);
if (!first_cpu) {
error_report("gdbstub: meaningless to attach gdb to a "
return -1;
}
- if (!device) {
+ if (cs->len == 0) {
return -1;
}
- if (strcmp(device, "none") != 0) {
- if (strstart(device, "tcp:", NULL)) {
+
+ trace_gdbstub_op_start(cs->str);
+
+ if (g_strcmp0(cs->str, "none") != 0) {
+ if (g_str_has_prefix(cs->str, "tcp:")) {
/* enforce required TCP attributes */
- snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
- "%s,wait=off,nodelay=on,server=on", device);
- device = gdbstub_device_name;
+ g_string_append_printf(cs, ",wait=off,nodelay=on,server=on");
}
#ifndef _WIN32
else if (strcmp(device, "stdio") == 0) {
* 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);
+ chr = qemu_chr_new_noreplay("gdb", cs->str, true, NULL);
if (!chr) {
return -1;
}
}
gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE;
gdbserver_system_state.mon_chr = mon_chr;
- gdbserver_state.current_syscall_cb = NULL;
+ gdb_syscall_reset();
return 0;
}
trace_gdbstub_op_exiting((uint8_t)code);
- snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
- gdb_put_packet(buf);
+ if (gdbserver_state.allow_stop_reply) {
+ snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
+ gdb_put_packet(buf);
+ gdbserver_state.allow_stop_reply = false;
+ }
qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
}
+/*
+ * Memory access
+ */
+static int phy_memory_mode;
+
+int gdb_target_memory_rw_debug(CPUState *cpu, hwaddr addr,
+ uint8_t *buf, int len, bool is_write)
+{
+ CPUClass *cc;
+
+ if (phy_memory_mode) {
+ if (is_write) {
+ cpu_physical_memory_write(addr, buf, len);
+ } else {
+ cpu_physical_memory_read(addr, buf, len);
+ }
+ return 0;
+ }
+
+ 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);
+}
+
+/*
+ * cpu helpers
+ */
+
+unsigned int gdb_get_max_cpus(void)
+{
+ MachineState *ms = MACHINE(qdev_get_machine());
+ return ms->smp.max_cpus;
+}
+
+bool gdb_can_reverse(void)
+{
+ return replay_mode == REPLAY_MODE_PLAY;
+}
+
/*
* Softmmu specific command helpers
*/
+
+void gdb_handle_query_qemu_phy_mem_mode(GArray *params,
+ void *user_ctx)
+{
+ g_string_printf(gdbserver_state.str_buf, "%d", phy_memory_mode);
+ gdb_put_strbuf();
+}
+
+void gdb_handle_set_qemu_phy_mem_mode(GArray *params, void *user_ctx)
+{
+ if (!params->len) {
+ gdb_put_packet("E22");
+ return;
+ }
+
+ if (!get_param(params, 0)->val_ul) {
+ phy_memory_mode = 0;
+ } else {
+ phy_memory_mode = 1;
+ }
+ gdb_put_packet("OK");
+}
+
void gdb_handle_query_rcmd(GArray *params, void *user_ctx)
{
const guint8 zero = 0;
gdb_put_packet("OK");
}
+/*
+ * Execution state helpers
+ */
+
+void gdb_handle_query_attached(GArray *params, void *user_ctx)
+{
+ gdb_put_packet("1");
+}
+
+void gdb_continue(void)
+{
+ if (!runstate_needs_reset()) {
+ trace_gdbstub_op_continue();
+ vm_start();
+ }
+}
+
+/*
+ * Resume execution, per CPU actions.
+ */
+int gdb_continue_partial(char *newstates)
+{
+ CPUState *cpu;
+ int res = 0;
+ int flag = 0;
+
+ if (!runstate_needs_reset()) {
+ bool step_requested = false;
+ CPU_FOREACH(cpu) {
+ if (newstates[cpu->cpu_index] == 's') {
+ step_requested = true;
+ break;
+ }
+ }
+
+ if (vm_prepare_start(step_requested)) {
+ 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);
+ }
+ return res;
+}
+
+/*
+ * Signal Handling - in system mode we only need SIGINT and SIGTRAP; other
+ * signals are not yet supported.
+ */
+
+enum {
+ TARGET_SIGINT = 2,
+ TARGET_SIGTRAP = 5
+};
+
+int gdb_signal_to_target(int sig)
+{
+ switch (sig) {
+ case 2:
+ return TARGET_SIGINT;
+ case 5:
+ return TARGET_SIGTRAP;
+ default:
+ return -1;
+ }
+}
+
/*
* Break/Watch point helpers
*/
projects / mirror_qemu.git / blobdiff