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#include "processor.h"
#include "triggers.h"
namespace triggers {
mcontrol_t::mcontrol_t() :
type(2), maskmax(0), select(false), timing(false), chain_bit(false),
match(MATCH_EQUAL), m(false), h(false), s(false), u(false),
execute_bit(false), store_bit(false), load_bit(false)
{
}
reg_t mcontrol_t::tdata1_read(const processor_t * const proc) const noexcept {
reg_t v = 0;
auto xlen = proc->get_xlen();
v = set_field(v, MCONTROL_TYPE(xlen), type);
v = set_field(v, MCONTROL_DMODE(xlen), dmode);
v = set_field(v, MCONTROL_MASKMAX(xlen), maskmax);
v = set_field(v, MCONTROL_SELECT, select);
v = set_field(v, MCONTROL_TIMING, timing);
v = set_field(v, MCONTROL_ACTION, action);
v = set_field(v, MCONTROL_CHAIN, chain_bit);
v = set_field(v, MCONTROL_MATCH, match);
v = set_field(v, MCONTROL_M, m);
v = set_field(v, MCONTROL_H, h);
v = set_field(v, MCONTROL_S, s);
v = set_field(v, MCONTROL_U, u);
v = set_field(v, MCONTROL_EXECUTE, execute_bit);
v = set_field(v, MCONTROL_STORE, store_bit);
v = set_field(v, MCONTROL_LOAD, load_bit);
return v;
}
bool mcontrol_t::tdata1_write(processor_t * const proc, const reg_t val) noexcept {
if (dmode && !proc->get_state()->debug_mode) {
return false;
}
auto xlen = proc->get_xlen();
dmode = get_field(val, MCONTROL_DMODE(xlen));
select = get_field(val, MCONTROL_SELECT);
timing = get_field(val, MCONTROL_TIMING);
action = (triggers::action_t) get_field(val, MCONTROL_ACTION);
chain_bit = get_field(val, MCONTROL_CHAIN);
unsigned match_value = get_field(val, MCONTROL_MATCH);
switch (match_value) {
case MATCH_EQUAL:
case MATCH_NAPOT:
case MATCH_GE:
case MATCH_LT:
case MATCH_MASK_LOW:
case MATCH_MASK_HIGH:
match = (triggers::mcontrol_t::match_t) match_value;
break;
default:
match = MATCH_EQUAL;
break;
}
m = get_field(val, MCONTROL_M);
h = get_field(val, MCONTROL_H);
s = get_field(val, MCONTROL_S);
u = get_field(val, MCONTROL_U);
execute_bit = get_field(val, MCONTROL_EXECUTE);
store_bit = get_field(val, MCONTROL_STORE);
load_bit = get_field(val, MCONTROL_LOAD);
// Assume we're here because of csrw.
if (execute_bit)
timing = 0;
return true;
}
reg_t mcontrol_t::tdata2_read(const processor_t * const proc) const noexcept {
return tdata2;
}
bool mcontrol_t::tdata2_write(processor_t * const proc, const reg_t val) noexcept {
if (dmode && !proc->get_state()->debug_mode) {
return false;
}
tdata2 = val;
return true;
}
bool mcontrol_t::simple_match(unsigned xlen, reg_t value) const {
switch (match) {
case triggers::mcontrol_t::MATCH_EQUAL:
return value == tdata2;
case triggers::mcontrol_t::MATCH_NAPOT:
{
reg_t mask = ~((1 << (cto(tdata2)+1)) - 1);
return (value & mask) == (tdata2 & mask);
}
case triggers::mcontrol_t::MATCH_GE:
return value >= tdata2;
case triggers::mcontrol_t::MATCH_LT:
return value < tdata2;
case triggers::mcontrol_t::MATCH_MASK_LOW:
{
reg_t mask = tdata2 >> (xlen/2);
return (value & mask) == (tdata2 & mask);
}
case triggers::mcontrol_t::MATCH_MASK_HIGH:
{
reg_t mask = tdata2 >> (xlen/2);
return ((value >> (xlen/2)) & mask) == (tdata2 & mask);
}
}
assert(0);
}
match_result_t mcontrol_t::memory_access_match(processor_t * const proc, operation_t operation, reg_t address, reg_t data) {
state_t * const state = proc->get_state();
if ((operation == triggers::OPERATION_EXECUTE && !execute_bit) ||
(operation == triggers::OPERATION_STORE && !store_bit) ||
(operation == triggers::OPERATION_LOAD && !load_bit) ||
(state->prv == PRV_M && !m) ||
(state->prv == PRV_S && !s) ||
(state->prv == PRV_U && !u)) {
return MATCH_NONE;
}
reg_t value;
if (select) {
value = data;
} else {
value = address;
}
// We need this because in 32-bit mode sometimes the PC bits get sign
// extended.
auto xlen = proc->get_xlen();
if (xlen == 32) {
value &= 0xffffffff;
}
if (simple_match(xlen, value)) {
if (timing)
return MATCH_FIRE_AFTER;
else
return MATCH_FIRE_BEFORE;
}
return MATCH_NONE;
}
module_t::module_t(unsigned count) : triggers(count) {
for (unsigned i = 0; i < count; i++) {
triggers[i] = new mcontrol_t();
}
}
module_t::~module_t() {
for (auto trigger : triggers) {
delete trigger;
}
}
match_result_t module_t::memory_access_match(action_t * const action, operation_t operation, reg_t address, reg_t data)
{
state_t * const state = proc->get_state();
if (state->debug_mode)
return MATCH_NONE;
bool chain_ok = true;
for (unsigned int i = 0; i < triggers.size(); i++) {
if (!chain_ok) {
chain_ok |= !triggers[i]->chain();
continue;
}
match_result_t result = triggers[i]->memory_access_match(proc, operation, address, data);
if (result != MATCH_NONE && !triggers[i]->chain()) {
*action = triggers[i]->action;
return result;
}
chain_ok = true;
}
return MATCH_NONE;
}
reg_t module_t::tdata1_read(const processor_t * const proc, unsigned index) const noexcept
{
return triggers[index]->tdata1_read(proc);
}
bool module_t::tdata1_write(processor_t * const proc, unsigned index, const reg_t val) noexcept
{
bool result = triggers[index]->tdata1_write(proc, val);
proc->trigger_updated(triggers);
return result;
}
reg_t module_t::tdata2_read(const processor_t * const proc, unsigned index) const noexcept
{
return triggers[index]->tdata2_read(proc);
}
bool module_t::tdata2_write(processor_t * const proc, unsigned index, const reg_t val) noexcept
{
bool result = triggers[index]->tdata2_write(proc, val);
proc->trigger_updated(triggers);
return result;
}
};
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