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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: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-06-27 09:53:51 +02:00 committed by Anthony Liguori
parent 8389e7f4e1
commit dd32aa1047
1 changed files with 58 additions and 0 deletions
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58
gdbstub.c
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@ -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");