///////////////////////// debug_module_t
-debug_module_t::debug_module_t(sim_t *sim, unsigned progbufsize, unsigned max_bus_master_bits) :
+debug_module_t::debug_module_t(sim_t *sim, unsigned progbufsize, unsigned max_bus_master_bits,
+ bool require_authentication) :
progbufsize(progbufsize),
program_buffer_bytes(4 + 4*progbufsize),
max_bus_master_bits(max_bus_master_bits),
+ require_authentication(require_authentication),
debug_progbuf_start(debug_data_start - program_buffer_bytes),
debug_abstract_start(debug_progbuf_start - debug_abstract_size*4),
sim(sim)
dmstatus = {0};
dmstatus.impebreak = true;
- dmstatus.authenticated = 1;
+ dmstatus.authenticated = !require_authentication;
dmstatus.version = 2;
abstractcs = {0};
sbcs.access16 = true;
if (max_bus_master_bits >= 8)
sbcs.access8 = true;
+
+ challenge = random();
}
void debug_module_t::add_device(bus_t *bus) {
case DMI_SBDATA3:
result = sbdata[3];
break;
+ case DMI_AUTHDATA:
+ result = challenge;
+ break;
default:
result = 0;
D(fprintf(stderr, "Unexpected. Returning Error."));
bool debug_module_t::dmi_write(unsigned address, uint32_t value)
{
D(fprintf(stderr, "dmi_write(0x%x, 0x%x)\n", address, value));
+
+ if (!dmstatus.authenticated && address != DMI_AUTHDATA &&
+ address != DMI_DMCONTROL)
+ return false;
+
if (address >= DMI_DATA0 && address < DMI_DATA0 + abstractcs.datacount) {
unsigned i = address - DMI_DATA0;
if (!abstractcs.busy)
if (!dmcontrol.dmactive && get_field(value, DMI_DMCONTROL_DMACTIVE))
reset();
dmcontrol.dmactive = get_field(value, DMI_DMCONTROL_DMACTIVE);
+ if (!dmstatus.authenticated)
+ return true;
if (dmcontrol.dmactive) {
dmcontrol.haltreq = get_field(value, DMI_DMCONTROL_HALTREQ);
dmcontrol.resumereq = get_field(value, DMI_DMCONTROL_RESUMEREQ);
case DMI_SBDATA3:
sbdata[3] = value;
return true;
+ case DMI_AUTHDATA:
+ D(fprintf(stderr, "debug authentication: got 0x%x; 0x%x unlocks\n", value,
+ challenge + secret));
+ if (require_authentication) {
+ if (value == challenge + secret) {
+ dmstatus.authenticated = true;
+ } else {
+ dmstatus.authenticated = false;
+ challenge = random();
+ }
+ }
+ return true;
}
}
return false;