Commit dd32aa10 authored by Jan Kiszka's avatar Jan Kiszka Committed by Anthony Liguori
Browse files

gdbstub: Add vCont support 



This patch adds support for the vCont remote gdb command. It is used by
gdb 6.8 or better to switch the debugging focus for single-stepping
multi-threaded targets, ie. multi-threaded application in user mode
emulation or VCPUs in system emulation.

Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>
parent 8389e7f4

gdbstub.c

+58 −0
Original line number Diff line number Diff line
@@ -1631,6 +1631,64 @@ static int gdb_handle_packet(GDBState *s, const char *line_buf) 
            s->signal = 0;

        gdb_continue(s);

        return RS_IDLE;

    case 'v':

        if (strncmp(p, "Cont", 4) == 0) {

            int res_signal, res_thread;



            p += 4;

            if (*p == '?') {

                put_packet(s, "vCont;c;C;s;S");

                break;

            }

            res = 0;

            res_signal = 0;

            res_thread = 0;

            while (*p) {

                int action, signal;



                if (*p++ != ';') {

                    res = 0;

                    break;

                }

                action = *p++;

                signal = 0;

                if (action == 'C' || action == 'S') {

                    signal = strtoul(p, (char **)&p, 16);

                } else if (action != 'c' && action != 's') {

                    res = 0;

                    break;

                }

                thread = 0;

                if (*p == ':') {

                    thread = strtoull(p+1, (char **)&p, 16);

                }

                action = tolower(action);

                if (res == 0 || (res == 'c' && action == 's')) {

                    res = action;

                    res_signal = signal;

                    res_thread = thread;

                }

            }

            if (res) {

                if (res_thread != -1 && res_thread != 0) {

                    env = find_cpu(res_thread);

                    if (env == NULL) {

                        put_packet(s, "E22");

                        break;

                    }

                    s->c_cpu = env;

                }

                if (res == 's') {

                    cpu_single_step(s->c_cpu, sstep_flags);

                }

                s->signal = res_signal;

                gdb_continue(s);

                return RS_IDLE;

            }

            break;

        } else {

            goto unknown_command;

        }

    case 'k':

        /* Kill the target */

        fprintf(stderr, "\nQEMU: Terminated via GDBstub\n");