mirror of
https://github.com/Motorhead1991/qemu.git
synced 2025-08-05 00:33:55 -06:00
gdbstub: move chunk of softmmu functionality to own file
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
parent
36e067b2f2
commit
b6fa2ec238
4 changed files with 478 additions and 413 deletions
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@ -11,10 +11,433 @@
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/cutils.h"
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#include "exec/gdbstub.h"
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#include "exec/hwaddr.h"
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#include "exec/tb-flush.h"
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#include "sysemu/cpus.h"
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#include "sysemu/runstate.h"
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#include "sysemu/replay.h"
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#include "hw/core/cpu.h"
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#include "hw/cpu/cluster.h"
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#include "hw/boards.h"
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#include "chardev/char.h"
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#include "chardev/char-fe.h"
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#include "monitor/monitor.h"
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#include "trace.h"
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#include "internals.h"
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/* System emulation specific state */
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typedef struct {
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CharBackend chr;
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Chardev *mon_chr;
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} GDBSystemState;
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GDBSystemState gdbserver_system_state;
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static void reset_gdbserver_state(void)
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{
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g_free(gdbserver_state.processes);
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gdbserver_state.processes = NULL;
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gdbserver_state.process_num = 0;
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}
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/*
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* Return the GDB index for a given vCPU state.
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*
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* In system mode GDB numbers CPUs from 1 as 0 is reserved as an "any
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* cpu" index.
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*/
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int gdb_get_cpu_index(CPUState *cpu)
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{
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return cpu->cpu_index + 1;
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}
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/*
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* GDB Connection management. For system emulation we do all of this
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* via our existing Chardev infrastructure which allows us to support
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* network and unix sockets.
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*/
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void gdb_put_buffer(const uint8_t *buf, int len)
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{
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/*
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* XXX this blocks entire thread. Rewrite to use
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* qemu_chr_fe_write and background I/O callbacks
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*/
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qemu_chr_fe_write_all(&gdbserver_system_state.chr, buf, len);
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}
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static void gdb_chr_event(void *opaque, QEMUChrEvent event)
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{
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int i;
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GDBState *s = (GDBState *) opaque;
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switch (event) {
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case CHR_EVENT_OPENED:
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/* Start with first process attached, others detached */
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for (i = 0; i < s->process_num; i++) {
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s->processes[i].attached = !i;
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}
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s->c_cpu = gdb_first_attached_cpu();
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s->g_cpu = s->c_cpu;
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vm_stop(RUN_STATE_PAUSED);
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replay_gdb_attached();
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gdb_has_xml = false;
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break;
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default:
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break;
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}
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}
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static void gdb_vm_state_change(void *opaque, bool running, RunState state)
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{
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CPUState *cpu = gdbserver_state.c_cpu;
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g_autoptr(GString) buf = g_string_new(NULL);
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g_autoptr(GString) tid = g_string_new(NULL);
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const char *type;
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int ret;
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if (running || gdbserver_state.state == RS_INACTIVE) {
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return;
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}
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/* Is there a GDB syscall waiting to be sent? */
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if (gdbserver_state.current_syscall_cb) {
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gdb_put_packet(gdbserver_state.syscall_buf);
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return;
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}
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if (cpu == NULL) {
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/* No process attached */
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return;
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}
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gdb_append_thread_id(cpu, tid);
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switch (state) {
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case RUN_STATE_DEBUG:
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if (cpu->watchpoint_hit) {
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switch (cpu->watchpoint_hit->flags & BP_MEM_ACCESS) {
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case BP_MEM_READ:
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type = "r";
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break;
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case BP_MEM_ACCESS:
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type = "a";
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break;
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default:
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type = "";
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break;
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}
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trace_gdbstub_hit_watchpoint(type,
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gdb_get_cpu_index(cpu),
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cpu->watchpoint_hit->vaddr);
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g_string_printf(buf, "T%02xthread:%s;%swatch:%" VADDR_PRIx ";",
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GDB_SIGNAL_TRAP, tid->str, type,
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cpu->watchpoint_hit->vaddr);
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cpu->watchpoint_hit = NULL;
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goto send_packet;
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} else {
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trace_gdbstub_hit_break();
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}
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tb_flush(cpu);
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ret = GDB_SIGNAL_TRAP;
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break;
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case RUN_STATE_PAUSED:
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trace_gdbstub_hit_paused();
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ret = GDB_SIGNAL_INT;
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break;
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case RUN_STATE_SHUTDOWN:
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trace_gdbstub_hit_shutdown();
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ret = GDB_SIGNAL_QUIT;
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break;
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case RUN_STATE_IO_ERROR:
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trace_gdbstub_hit_io_error();
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ret = GDB_SIGNAL_IO;
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break;
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case RUN_STATE_WATCHDOG:
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trace_gdbstub_hit_watchdog();
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ret = GDB_SIGNAL_ALRM;
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break;
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case RUN_STATE_INTERNAL_ERROR:
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trace_gdbstub_hit_internal_error();
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ret = GDB_SIGNAL_ABRT;
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break;
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case RUN_STATE_SAVE_VM:
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case RUN_STATE_RESTORE_VM:
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return;
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case RUN_STATE_FINISH_MIGRATE:
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ret = GDB_SIGNAL_XCPU;
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break;
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default:
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trace_gdbstub_hit_unknown(state);
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ret = GDB_SIGNAL_UNKNOWN;
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break;
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}
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gdb_set_stop_cpu(cpu);
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g_string_printf(buf, "T%02xthread:%s;", ret, tid->str);
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send_packet:
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gdb_put_packet(buf->str);
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/* disable single step if it was enabled */
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cpu_single_step(cpu, 0);
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}
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#ifndef _WIN32
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static void gdb_sigterm_handler(int signal)
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{
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if (runstate_is_running()) {
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vm_stop(RUN_STATE_PAUSED);
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}
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}
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#endif
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static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
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{
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g_autoptr(GString) hex_buf = g_string_new("O");
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gdb_memtohex(hex_buf, buf, len);
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gdb_put_packet(hex_buf->str);
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return len;
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}
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static void gdb_monitor_open(Chardev *chr, ChardevBackend *backend,
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bool *be_opened, Error **errp)
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{
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*be_opened = false;
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}
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static void char_gdb_class_init(ObjectClass *oc, void *data)
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{
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ChardevClass *cc = CHARDEV_CLASS(oc);
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cc->internal = true;
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cc->open = gdb_monitor_open;
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cc->chr_write = gdb_monitor_write;
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}
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#define TYPE_CHARDEV_GDB "chardev-gdb"
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static const TypeInfo char_gdb_type_info = {
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.name = TYPE_CHARDEV_GDB,
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.parent = TYPE_CHARDEV,
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.class_init = char_gdb_class_init,
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};
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static int gdb_chr_can_receive(void *opaque)
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{
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/*
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* We can handle an arbitrarily large amount of data.
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* Pick the maximum packet size, which is as good as anything.
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*/
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return MAX_PACKET_LENGTH;
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}
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static void gdb_chr_receive(void *opaque, const uint8_t *buf, int size)
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{
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int i;
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for (i = 0; i < size; i++) {
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gdb_read_byte(buf[i]);
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}
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}
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static int find_cpu_clusters(Object *child, void *opaque)
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{
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if (object_dynamic_cast(child, TYPE_CPU_CLUSTER)) {
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GDBState *s = (GDBState *) opaque;
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CPUClusterState *cluster = CPU_CLUSTER(child);
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GDBProcess *process;
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s->processes = g_renew(GDBProcess, s->processes, ++s->process_num);
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process = &s->processes[s->process_num - 1];
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/*
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* GDB process IDs -1 and 0 are reserved. To avoid subtle errors at
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* runtime, we enforce here that the machine does not use a cluster ID
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* that would lead to PID 0.
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*/
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assert(cluster->cluster_id != UINT32_MAX);
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process->pid = cluster->cluster_id + 1;
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process->attached = false;
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process->target_xml[0] = '\0';
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return 0;
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}
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return object_child_foreach(child, find_cpu_clusters, opaque);
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}
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static int pid_order(const void *a, const void *b)
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{
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GDBProcess *pa = (GDBProcess *) a;
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GDBProcess *pb = (GDBProcess *) b;
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if (pa->pid < pb->pid) {
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return -1;
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} else if (pa->pid > pb->pid) {
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return 1;
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} else {
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return 0;
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}
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}
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static void create_processes(GDBState *s)
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{
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object_child_foreach(object_get_root(), find_cpu_clusters, s);
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if (gdbserver_state.processes) {
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/* Sort by PID */
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qsort(gdbserver_state.processes,
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gdbserver_state.process_num,
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sizeof(gdbserver_state.processes[0]),
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pid_order);
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}
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gdb_create_default_process(s);
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}
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int gdbserver_start(const char *device)
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{
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trace_gdbstub_op_start(device);
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char gdbstub_device_name[128];
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Chardev *chr = NULL;
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Chardev *mon_chr;
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if (!first_cpu) {
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error_report("gdbstub: meaningless to attach gdb to a "
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"machine without any CPU.");
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return -1;
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}
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if (!gdb_supports_guest_debug()) {
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error_report("gdbstub: current accelerator doesn't "
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"support guest debugging");
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return -1;
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}
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if (!device) {
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return -1;
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}
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if (strcmp(device, "none") != 0) {
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if (strstart(device, "tcp:", NULL)) {
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/* enforce required TCP attributes */
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snprintf(gdbstub_device_name, sizeof(gdbstub_device_name),
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"%s,wait=off,nodelay=on,server=on", device);
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device = gdbstub_device_name;
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}
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#ifndef _WIN32
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else if (strcmp(device, "stdio") == 0) {
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struct sigaction act;
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memset(&act, 0, sizeof(act));
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act.sa_handler = gdb_sigterm_handler;
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sigaction(SIGINT, &act, NULL);
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}
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#endif
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/*
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* FIXME: it's a bit weird to allow using a mux chardev here
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* and implicitly setup a monitor. We may want to break this.
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*/
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chr = qemu_chr_new_noreplay("gdb", device, true, NULL);
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if (!chr) {
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return -1;
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}
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}
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if (!gdbserver_state.init) {
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gdb_init_gdbserver_state();
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qemu_add_vm_change_state_handler(gdb_vm_state_change, NULL);
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/* Initialize a monitor terminal for gdb */
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mon_chr = qemu_chardev_new(NULL, TYPE_CHARDEV_GDB,
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NULL, NULL, &error_abort);
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monitor_init_hmp(mon_chr, false, &error_abort);
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} else {
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qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
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mon_chr = gdbserver_system_state.mon_chr;
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reset_gdbserver_state();
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}
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create_processes(&gdbserver_state);
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if (chr) {
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qemu_chr_fe_init(&gdbserver_system_state.chr, chr, &error_abort);
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qemu_chr_fe_set_handlers(&gdbserver_system_state.chr,
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gdb_chr_can_receive,
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gdb_chr_receive, gdb_chr_event,
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NULL, &gdbserver_state, NULL, true);
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}
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gdbserver_state.state = chr ? RS_IDLE : RS_INACTIVE;
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gdbserver_system_state.mon_chr = mon_chr;
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gdbserver_state.current_syscall_cb = NULL;
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return 0;
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}
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static void register_types(void)
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{
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type_register_static(&char_gdb_type_info);
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}
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type_init(register_types);
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/* Tell the remote gdb that the process has exited. */
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void gdb_exit(int code)
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{
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char buf[4];
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if (!gdbserver_state.init) {
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return;
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}
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trace_gdbstub_op_exiting((uint8_t)code);
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snprintf(buf, sizeof(buf), "W%02x", (uint8_t)code);
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gdb_put_packet(buf);
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qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
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}
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/*
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* Softmmu specific command helpers
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*/
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void gdb_handle_query_rcmd(GArray *params, void *user_ctx)
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{
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const guint8 zero = 0;
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int len;
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if (!params->len) {
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gdb_put_packet("E22");
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return;
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}
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len = strlen(get_param(params, 0)->data);
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if (len % 2) {
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gdb_put_packet("E01");
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return;
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}
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g_assert(gdbserver_state.mem_buf->len == 0);
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len = len / 2;
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gdb_hextomem(gdbserver_state.mem_buf, get_param(params, 0)->data, len);
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g_byte_array_append(gdbserver_state.mem_buf, &zero, 1);
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qemu_chr_be_write(gdbserver_system_state.mon_chr,
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gdbserver_state.mem_buf->data,
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gdbserver_state.mem_buf->len);
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gdb_put_packet("OK");
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}
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/*
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* Break/Watch point helpers
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*/
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bool gdb_supports_guest_debug(void)
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{
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const AccelOpsClass *ops = cpus_get_accel();
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