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#include "arith.h"
#include "debug_defines.h"
#include "processor.h"
#include "triggers.h"
#define ASIDMAX(SXLEN) (SXLEN == 32 ? 9 : 16)
#define SATP_ASID(SXLEN) (SXLEN == 32 ? SATP32_ASID : SATP64_ASID)
#define VMIDMAX(HSXLEN) (HSXLEN == 32 ? 7 : 14)
#define HGATP_VMID(HSXLEN) (HSXLEN == 32 ? HGATP32_VMID : HGATP64_VMID)
#define CSR_TEXTRA_MHVALUE_LENGTH(XLEN) (XLEN == 32 ? CSR_TEXTRA32_MHVALUE_LENGTH : CSR_TEXTRA64_MHVALUE_LENGTH)
#define CSR_TEXTRA_MHVALUE(XLEN) (XLEN == 32 ? CSR_TEXTRA32_MHVALUE : CSR_TEXTRA64_MHVALUE)
#define CSR_TEXTRA_MHSELECT(XLEN) (XLEN == 32 ? CSR_TEXTRA32_MHSELECT : CSR_TEXTRA64_MHSELECT)
#define CSR_TEXTRA_SBYTEMASK(XLEN) (XLEN == 32 ? CSR_TEXTRA32_SBYTEMASK : CSR_TEXTRA64_SBYTEMASK)
#define CSR_TEXTRA_SVALUE(XLEN) (XLEN == 32 ? CSR_TEXTRA32_SVALUE : CSR_TEXTRA64_SVALUE)
#define CSR_TEXTRA_SSELECT(XLEN) (XLEN == 32 ? CSR_TEXTRA32_SSELECT : CSR_TEXTRA64_SSELECT)
namespace triggers {
reg_t trigger_t::tdata2_read(const processor_t UNUSED * const proc) const noexcept {
return tdata2;
}
void trigger_t::tdata2_write(processor_t UNUSED * const proc, const reg_t UNUSED val) noexcept {
tdata2 = val;
}
action_t trigger_t::legalize_action(reg_t val) const noexcept {
return (val > ACTION_MAXVAL || (val == ACTION_DEBUG_MODE && get_dmode() == 0)) ? ACTION_DEBUG_EXCEPTION : (action_t)val;
}
unsigned trigger_t::legalize_mhselect(bool h_enabled) const noexcept {
const auto interp = interpret_mhselect(h_enabled);
return interp.mhselect;
}
reg_t trigger_t::tdata3_read(const processor_t * const proc) const noexcept {
auto xlen = proc->get_xlen();
reg_t tdata3 = 0;
tdata3 = set_field(tdata3, CSR_TEXTRA_MHVALUE(xlen), mhvalue);
tdata3 = set_field(tdata3, CSR_TEXTRA_MHSELECT(xlen), legalize_mhselect(proc->extension_enabled('H')));
tdata3 = set_field(tdata3, CSR_TEXTRA_SBYTEMASK(xlen), sbytemask);
tdata3 = set_field(tdata3, CSR_TEXTRA_SVALUE(xlen), svalue);
tdata3 = set_field(tdata3, CSR_TEXTRA_SSELECT(xlen), sselect);
return tdata3;
}
void trigger_t::tdata3_write(processor_t * const proc, const reg_t val) noexcept {
auto xlen = proc->get_xlen();
mhvalue = get_field(val, CSR_TEXTRA_MHVALUE(xlen));
mhselect = get_field(val, CSR_TEXTRA_MHSELECT(xlen));
sbytemask = get_field(val, CSR_TEXTRA_SBYTEMASK(xlen));
svalue = proc->extension_enabled_const('S') ? get_field(val, CSR_TEXTRA_SVALUE(xlen)) : 0;
sselect = (sselect_t)((proc->extension_enabled_const('S') && get_field(val, CSR_TEXTRA_SSELECT(xlen)) <= SSELECT_MAXVAL) ? get_field(val, CSR_TEXTRA_SSELECT(xlen)) : SSELECT_IGNORE);
}
bool trigger_t::common_match(processor_t * const proc) const noexcept {
return mode_match(proc->get_state()) && textra_match(proc);
}
bool trigger_t::mode_match(state_t * const state) const noexcept
{
switch (state->prv) {
case PRV_M: return m;
case PRV_S: return state->v ? vs : s;
case PRV_U: return state->v ? vu : u;
default: assert(false);
}
}
bool trigger_t::textra_match(processor_t * const proc) const noexcept
{
auto xlen = proc->get_xlen();
auto hsxlen = proc->get_xlen(); // use xlen since no hsxlen
state_t * const state = proc->get_state();
assert(sselect <= SSELECT_MAXVAL);
if (sselect == SSELECT_SCONTEXT) {
reg_t mask = (reg_t(1) << ((xlen == 32) ? CSR_TEXTRA32_SVALUE_LENGTH : CSR_TEXTRA64_SVALUE_LENGTH)) - 1;
assert(CSR_TEXTRA32_SBYTEMASK_LENGTH < CSR_TEXTRA64_SBYTEMASK_LENGTH);
for (int i = 0; i < CSR_TEXTRA64_SBYTEMASK_LENGTH; i++)
if (sbytemask & (1 << i))
mask &= 0xff << (i * 8);
if ((state->scontext->read() & mask) != (svalue & mask))
return false;
} else if (sselect == SSELECT_ASID) {
const reg_t satp = state->satp->read();
const reg_t asid = get_field(satp, SATP_ASID(xlen));
if (asid != (svalue & ((1 << ASIDMAX(xlen)) - 1)))
return false;
}
const auto mhselect_interp = interpret_mhselect(proc->extension_enabled('H'));
const mhselect_mode_t mode = mhselect_interp.mode;
if (mode == MHSELECT_MODE_MCONTEXT) { // 4, 1, and 5 are mcontext
reg_t mask = (1 << (CSR_TEXTRA_MHVALUE_LENGTH(xlen) + 1)) - 1;
if ((state->mcontext->read() & mask) != mhselect_interp.compare_val(mhvalue))
return false;
} else if (mode == MHSELECT_MODE_VMID) { // 2 and 6 are vmid
const reg_t vmid = get_field(state->hgatp->read(), HGATP_VMID(hsxlen));
if (vmid != (mhselect_interp.compare_val(mhvalue) & ((1 << VMIDMAX(hsxlen)) - 1)))
return false;
}
return true;
}
reg_t disabled_trigger_t::tdata1_read(const processor_t * const proc) const noexcept
{
auto xlen = proc->get_xlen();
reg_t tdata1 = 0;
tdata1 = set_field(tdata1, CSR_TDATA1_TYPE(xlen), CSR_TDATA1_TYPE_DISABLED);
tdata1 = set_field(tdata1, CSR_TDATA1_DMODE(xlen), dmode);
return tdata1;
}
void disabled_trigger_t::tdata1_write(processor_t * const proc, const reg_t val, const bool UNUSED allow_chain) noexcept
{
// Any supported tdata.type results in disabled trigger
auto xlen = proc->get_xlen();
dmode = get_field(val, CSR_TDATA1_DMODE(xlen));
}
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), CSR_TDATA1_TYPE_MCONTROL);
v = set_field(v, CSR_MCONTROL_DMODE(xlen), dmode);
v = set_field(v, MCONTROL_MASKMAX(xlen), 0);
v = set_field(v, CSR_MCONTROL_HIT, hit);
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);
v = set_field(v, MCONTROL_MATCH, match);
v = set_field(v, MCONTROL_M, m);
v = set_field(v, MCONTROL_S, s);
v = set_field(v, MCONTROL_U, u);
v = set_field(v, MCONTROL_EXECUTE, execute);
v = set_field(v, MCONTROL_STORE, store);
v = set_field(v, MCONTROL_LOAD, load);
return v;
}
void mcontrol_t::tdata1_write(processor_t * const proc, const reg_t val, const bool allow_chain) noexcept {
auto xlen = proc->get_xlen();
assert(get_field(val, CSR_MCONTROL_TYPE(xlen)) == CSR_TDATA1_TYPE_MCONTROL);
dmode = get_field(val, CSR_MCONTROL_DMODE(xlen));
hit = get_field(val, CSR_MCONTROL_HIT);
select = get_field(val, MCONTROL_SELECT);
timing = get_field(val, MCONTROL_TIMING);
action = legalize_action(get_field(val, MCONTROL_ACTION));
chain = allow_chain ? get_field(val, MCONTROL_CHAIN) : 0;
match = legalize_match(get_field(val, MCONTROL_MATCH));
m = get_field(val, MCONTROL_M);
s = proc->extension_enabled_const('S') ? get_field(val, CSR_MCONTROL_S) : 0;
u = proc->extension_enabled_const('U') ? get_field(val, CSR_MCONTROL_U) : 0;
execute = get_field(val, MCONTROL_EXECUTE);
store = get_field(val, MCONTROL_STORE);
load = get_field(val, MCONTROL_LOAD);
// Assume we're here because of csrw.
if (execute)
timing = 0;
}
bool mcontrol_common_t::simple_match(unsigned xlen, reg_t value) const {
switch (match) {
case MATCH_EQUAL:
return value == tdata2;
case MATCH_NAPOT:
{
reg_t mask = ~((1 << (cto(tdata2)+1)) - 1);
return (value & mask) == (tdata2 & mask);
}
case MATCH_GE:
return value >= tdata2;
case MATCH_LT:
return value < tdata2;
case MATCH_MASK_LOW:
{
reg_t mask = tdata2 >> (xlen/2);
return (value & mask) == (tdata2 & mask);
}
case MATCH_MASK_HIGH:
{
reg_t mask = tdata2 >> (xlen/2);
return ((value >> (xlen/2)) & mask) == (tdata2 & mask);
}
}
assert(0);
}
std::optional<match_result_t> mcontrol_common_t::detect_memory_access_match(processor_t * const proc, operation_t operation, reg_t address, std::optional<reg_t> data) noexcept {
if ((operation == triggers::OPERATION_EXECUTE && !execute) ||
(operation == triggers::OPERATION_STORE && !store) ||
(operation == triggers::OPERATION_LOAD && !load) ||
!common_match(proc)) {
return std::nullopt;
}
reg_t value;
if (select) {
if (!data.has_value())
return std::nullopt;
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)) {
/* This is OK because this function is only called if the trigger was not
* inhibited by the previous trigger in the chain. */
hit = true;
return match_result_t(timing_t(timing), action);
}
return std::nullopt;
}
mcontrol_common_t::match_t mcontrol_common_t::legalize_match(reg_t val) const noexcept
{
switch (val) {
case MATCH_EQUAL:
case MATCH_NAPOT:
case MATCH_GE:
case MATCH_LT:
case MATCH_MASK_LOW:
case MATCH_MASK_HIGH:
return (match_t)val;
default:
return MATCH_EQUAL;
}
}
reg_t mcontrol6_t::tdata1_read(const processor_t * const proc) const noexcept {
unsigned xlen = proc->get_const_xlen();
reg_t tdata1 = 0;
tdata1 = set_field(tdata1, CSR_MCONTROL6_TYPE(xlen), 6);
tdata1 = set_field(tdata1, CSR_MCONTROL6_DMODE(xlen), dmode);
tdata1 = set_field(tdata1, CSR_MCONTROL6_VS, proc->extension_enabled('H') ? vs : 0);
tdata1 = set_field(tdata1, CSR_MCONTROL6_VU, proc->extension_enabled('H') ? vu : 0);
tdata1 = set_field(tdata1, CSR_MCONTROL6_HIT, hit);
tdata1 = set_field(tdata1, CSR_MCONTROL6_SELECT, select);
tdata1 = set_field(tdata1, CSR_MCONTROL6_TIMING, timing);
tdata1 = set_field(tdata1, CSR_MCONTROL6_ACTION, action);
tdata1 = set_field(tdata1, CSR_MCONTROL6_CHAIN, chain);
tdata1 = set_field(tdata1, CSR_MCONTROL6_MATCH, match);
tdata1 = set_field(tdata1, CSR_MCONTROL6_M, m);
tdata1 = set_field(tdata1, CSR_MCONTROL6_S, s);
tdata1 = set_field(tdata1, CSR_MCONTROL6_U, u);
tdata1 = set_field(tdata1, CSR_MCONTROL6_EXECUTE, execute);
tdata1 = set_field(tdata1, CSR_MCONTROL6_STORE, store);
tdata1 = set_field(tdata1, CSR_MCONTROL6_LOAD, load);
return tdata1;
}
void mcontrol6_t::tdata1_write(processor_t * const proc, const reg_t val, const bool allow_chain) noexcept {
auto xlen = proc->get_const_xlen();
assert(get_field(val, CSR_MCONTROL6_TYPE(xlen)) == CSR_TDATA1_TYPE_MCONTROL6);
dmode = get_field(val, CSR_MCONTROL6_DMODE(xlen));
vs = get_field(val, CSR_MCONTROL6_VS);
vu = get_field(val, CSR_MCONTROL6_VU);
hit = get_field(val, CSR_MCONTROL6_HIT);
select = get_field(val, CSR_MCONTROL6_SELECT);
timing = get_field(val, CSR_MCONTROL6_TIMING);
action = legalize_action(get_field(val, CSR_MCONTROL6_ACTION));
chain = allow_chain ? get_field(val, CSR_MCONTROL6_CHAIN) : 0;
match = legalize_match(get_field(val, CSR_MCONTROL6_MATCH));
m = get_field(val, CSR_MCONTROL6_M);
s = proc->extension_enabled_const('S') ? get_field(val, CSR_MCONTROL6_S) : 0;
u = proc->extension_enabled_const('U') ? get_field(val, CSR_MCONTROL6_U) : 0;
execute = get_field(val, CSR_MCONTROL6_EXECUTE);
store = get_field(val, CSR_MCONTROL6_STORE);
load = get_field(val, CSR_MCONTROL6_LOAD);
if (execute)
timing = 0;
}
reg_t itrigger_t::tdata1_read(const processor_t * const proc) const noexcept
{
auto xlen = proc->get_xlen();
reg_t tdata1 = 0;
tdata1 = set_field(tdata1, CSR_ITRIGGER_TYPE(xlen), CSR_TDATA1_TYPE_ITRIGGER);
tdata1 = set_field(tdata1, CSR_ITRIGGER_DMODE(xlen), dmode);
tdata1 = set_field(tdata1, CSR_ITRIGGER_HIT(xlen), hit);
tdata1 = set_field(tdata1, CSR_ITRIGGER_VS, proc->extension_enabled('H') ? vs : 0);
tdata1 = set_field(tdata1, CSR_ITRIGGER_VU, proc->extension_enabled('H') ? vu : 0);
tdata1 = set_field(tdata1, CSR_ITRIGGER_NMI, nmi);
tdata1 = set_field(tdata1, CSR_ITRIGGER_M, m);
tdata1 = set_field(tdata1, CSR_ITRIGGER_S, s);
tdata1 = set_field(tdata1, CSR_ITRIGGER_U, u);
tdata1 = set_field(tdata1, CSR_ITRIGGER_ACTION, action);
return tdata1;
}
void itrigger_t::tdata1_write(processor_t * const proc, const reg_t val, const bool UNUSED allow_chain) noexcept
{
auto xlen = proc->get_xlen();
assert(get_field(val, CSR_ITRIGGER_TYPE(xlen)) == CSR_TDATA1_TYPE_ITRIGGER);
dmode = get_field(val, CSR_ITRIGGER_DMODE(xlen));
hit = get_field(val, CSR_ITRIGGER_HIT(xlen));
vs = get_field(val, CSR_ITRIGGER_VS);
vu = get_field(val, CSR_ITRIGGER_VU);
nmi = get_field(val, CSR_ITRIGGER_NMI);
m = get_field(val, CSR_ITRIGGER_M);
s = proc->extension_enabled_const('S') ? get_field(val, CSR_ITRIGGER_S) : 0;
u = proc->extension_enabled_const('U') ? get_field(val, CSR_ITRIGGER_U) : 0;
action = legalize_action(get_field(val, CSR_ITRIGGER_ACTION));
}
std::optional<match_result_t> trap_common_t::detect_trap_match(processor_t * const proc, const trap_t& t) noexcept
{
if (!common_match(proc))
return std::nullopt;
auto xlen = proc->get_xlen();
bool interrupt = (t.cause() & ((reg_t)1 << (xlen - 1))) != 0;
reg_t bit = t.cause() & ~((reg_t)1 << (xlen - 1));
assert(bit < xlen);
if (simple_match(interrupt, bit)) {
hit = true;
return match_result_t(TIMING_AFTER, action);
}
return std::nullopt;
}
bool itrigger_t::simple_match(bool interrupt, reg_t bit) const
{
return interrupt && ((bit == 0 && nmi) || ((tdata2 >> bit) & 1)); // Assume NMI's exception code is 0
}
reg_t etrigger_t::tdata1_read(const processor_t * const proc) const noexcept
{
auto xlen = proc->get_xlen();
reg_t tdata1 = 0;
tdata1 = set_field(tdata1, CSR_ETRIGGER_TYPE(xlen), CSR_TDATA1_TYPE_ETRIGGER);
tdata1 = set_field(tdata1, CSR_ETRIGGER_DMODE(xlen), dmode);
tdata1 = set_field(tdata1, CSR_ETRIGGER_HIT(xlen), hit);
tdata1 = set_field(tdata1, CSR_ETRIGGER_VS, proc->extension_enabled('H') ? vs : 0);
tdata1 = set_field(tdata1, CSR_ETRIGGER_VU, proc->extension_enabled('H') ? vu : 0);
tdata1 = set_field(tdata1, CSR_ETRIGGER_M, m);
tdata1 = set_field(tdata1, CSR_ETRIGGER_S, s);
tdata1 = set_field(tdata1, CSR_ETRIGGER_U, u);
tdata1 = set_field(tdata1, CSR_ETRIGGER_ACTION, action);
return tdata1;
}
void etrigger_t::tdata1_write(processor_t * const proc, const reg_t val, const bool UNUSED allow_chain) noexcept
{
auto xlen = proc->get_xlen();
assert(get_field(val, CSR_ETRIGGER_TYPE(xlen)) == CSR_TDATA1_TYPE_ETRIGGER);
dmode = get_field(val, CSR_ETRIGGER_DMODE(xlen));
hit = get_field(val, CSR_ETRIGGER_HIT(xlen));
vs = get_field(val, CSR_ETRIGGER_VS);
vu = get_field(val, CSR_ETRIGGER_VU);
m = get_field(val, CSR_ETRIGGER_M);
s = proc->extension_enabled_const('S') ? get_field(val, CSR_ETRIGGER_S) : 0;
u = proc->extension_enabled_const('U') ? get_field(val, CSR_ETRIGGER_U) : 0;
action = legalize_action(get_field(val, CSR_ETRIGGER_ACTION));
}
bool etrigger_t::simple_match(bool interrupt, reg_t bit) const
{
return !interrupt && ((tdata2 >> bit) & 1);
}
module_t::module_t(unsigned count) : triggers(count) {
for (unsigned i = 0; i < count; i++) {
triggers[i] = new disabled_trigger_t();
}
}
module_t::~module_t() {
for (auto trigger : triggers) {
delete trigger;
}
}
reg_t module_t::tdata1_read(unsigned index) const noexcept
{
return triggers[index]->tdata1_read(proc);
}
bool module_t::tdata1_write(unsigned index, const reg_t val) noexcept
{
if (triggers[index]->get_dmode() && !proc->get_state()->debug_mode) {
return false;
}
auto xlen = proc->get_xlen();
// hardware should ignore writes that set dmode to 1 if the previous trigger has both dmode of 0 and chain of 1
if (index > 0 && !triggers[index-1]->get_dmode() && triggers[index-1]->get_chain() && get_field(val, CSR_TDATA1_DMODE(xlen)))
return false;
unsigned type = get_field(val, CSR_TDATA1_TYPE(xlen));
reg_t tdata1 = val;
reg_t tdata2 = triggers[index]->tdata2_read(proc);
reg_t tdata3 = triggers[index]->tdata3_read(proc);
// hardware must zero chain in writes that set dmode to 0 if the next trigger has dmode of 1
const bool allow_chain = !(index+1 < triggers.size() && triggers[index+1]->get_dmode() && !get_field(val, CSR_TDATA1_DMODE(xlen)));
// dmode only writable from debug mode
if (!proc->get_state()->debug_mode) {
assert(CSR_TDATA1_DMODE(xlen) == CSR_MCONTROL_DMODE(xlen));
assert(CSR_TDATA1_DMODE(xlen) == CSR_ITRIGGER_DMODE(xlen));
assert(CSR_TDATA1_DMODE(xlen) == CSR_ETRIGGER_DMODE(xlen));
tdata1 = set_field(tdata1, CSR_TDATA1_DMODE(xlen), 0);
}
delete triggers[index];
switch (type) {
case CSR_TDATA1_TYPE_MCONTROL: triggers[index] = new mcontrol_t(); break;
case CSR_TDATA1_TYPE_ITRIGGER: triggers[index] = new itrigger_t(); break;
case CSR_TDATA1_TYPE_ETRIGGER: triggers[index] = new etrigger_t(); break;
case CSR_TDATA1_TYPE_MCONTROL6: triggers[index] = new mcontrol6_t(); break;
default: triggers[index] = new disabled_trigger_t(); break;
}
triggers[index]->tdata1_write(proc, tdata1, allow_chain);
triggers[index]->tdata2_write(proc, tdata2);
triggers[index]->tdata3_write(proc, tdata3);
proc->trigger_updated(triggers);
return true;
}
reg_t module_t::tdata2_read(unsigned index) const noexcept
{
return triggers[index]->tdata2_read(proc);
}
bool module_t::tdata2_write(unsigned index, const reg_t val) noexcept
{
if (triggers[index]->get_dmode() && !proc->get_state()->debug_mode) {
return false;
}
triggers[index]->tdata2_write(proc, val);
proc->trigger_updated(triggers);
return true;
}
reg_t module_t::tdata3_read(unsigned index) const noexcept
{
return triggers[index]->tdata3_read(proc);
}
bool module_t::tdata3_write(unsigned index, const reg_t val) noexcept
{
if (triggers[index]->get_dmode() && !proc->get_state()->debug_mode) {
return false;
}
triggers[index]->tdata3_write(proc, val);
proc->trigger_updated(triggers);
return true;
}
std::optional<match_result_t> module_t::detect_memory_access_match(operation_t operation, reg_t address, std::optional<reg_t> data) noexcept
{
state_t * const state = proc->get_state();
if (state->debug_mode)
return std::nullopt;
bool chain_ok = true;
for (auto trigger: triggers) {
if (!chain_ok) {
chain_ok = !trigger->get_chain();
continue;
}
/* Note: We call detect_memory_access_match for each trigger in a chain as long as
* the triggers are matching. This results in "temperature coding" so that
* `hit` is set on each of the consecutive triggers that matched, even if the
* entire chain did not match. This is allowed by the spec, because the final
* trigger in the chain will never get `hit` set unless the entire chain
* matches. */
auto result = trigger->detect_memory_access_match(proc, operation, address, data);
if (result.has_value() && !trigger->get_chain())
return result;
chain_ok = result.has_value() || !trigger->get_chain();
}
return std::nullopt;
}
std::optional<match_result_t> module_t::detect_trap_match(const trap_t& t) noexcept
{
state_t * const state = proc->get_state();
if (state->debug_mode)
return std::nullopt;
for (auto trigger: triggers) {
auto result = trigger->detect_trap_match(proc, t);
if (result.has_value())
return result;
}
return std::nullopt;
}
reg_t module_t::tinfo_read(unsigned UNUSED index) const noexcept
{
/* In spike, every trigger supports the same types. */
return (1 << CSR_TDATA1_TYPE_MCONTROL) |
(1 << CSR_TDATA1_TYPE_ITRIGGER) |
(1 << CSR_TDATA1_TYPE_ETRIGGER) |
(1 << CSR_TDATA1_TYPE_MCONTROL6) |
(1 << CSR_TDATA1_TYPE_DISABLED);
}
};
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