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qemu/target/riscv/debug.c
Alvin Chang 6ffe9b6669 target/riscv: Add textra matching condition for the triggers 
According to RISC-V Debug specification, the optional textra32 and
textra64 trigger CSRs can be used to configure additional matching
conditions for the triggers. For example, if the textra.MHSELECT field
is set to 4 (mcontext), this trigger will only match or fire if the low
bits of mcontext/hcontext equal textra.MHVALUE field.

This commit adds the aforementioned matching condition as common trigger
matching conditions. Currently, the only legal values of textra.MHSELECT
are 0 (ignore) and 4 (mcontext). When textra.MHSELECT is 0, we pass the
checking. When textra.MHSELECT is 4, we compare textra.MHVALUE with
mcontext CSR. The remaining fields, such as textra.SBYTEMASK,
textra.SVALUE, and textra.SSELECT, are hardwired to zero for now. Thus,
we skip checking them here.

Signed-off-by: Alvin Chang <alvinga@andestech.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20240826024657.262553-3-alvinga@andestech.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
2024-10-02 15:11:51 +10:00

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/*
* QEMU RISC-V Native Debug Support
*
* Copyright (c) 2022 Wind River Systems, Inc.
*
* Author:
* Bin Meng <bin.meng@windriver.com>
*
* This provides the native debug support via the Trigger Module, as defined
* in the RISC-V Debug Specification:
* https://github.com/riscv/riscv-debug-spec/raw/master/riscv-debug-stable.pdf
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2 or later, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qapi/error.h"
#include "cpu.h"
#include "trace.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "sysemu/cpu-timers.h"
/*
* The following M-mode trigger CSRs are implemented:
*
* - tselect
* - tdata1
* - tdata2
* - tdata3
* - tinfo
*
* The following triggers are initialized by default:
*
* Index | Type | tdata mapping | Description
* ------+------+------------------------+------------
* 0 | 2 | tdata1, tdata2 | Address / Data Match
* 1 | 2 | tdata1, tdata2 | Address / Data Match
*/
/* tdata availability of a trigger */
typedef bool tdata_avail[TDATA_NUM];
static tdata_avail tdata_mapping[TRIGGER_TYPE_NUM] = {
[TRIGGER_TYPE_NO_EXIST] = { false, false, false },
[TRIGGER_TYPE_AD_MATCH] = { true, true, true },
[TRIGGER_TYPE_INST_CNT] = { true, false, true },
[TRIGGER_TYPE_INT] = { true, true, true },
[TRIGGER_TYPE_EXCP] = { true, true, true },
[TRIGGER_TYPE_AD_MATCH6] = { true, true, true },
[TRIGGER_TYPE_EXT_SRC] = { true, false, false },
[TRIGGER_TYPE_UNAVAIL] = { true, true, true }
};
/* only breakpoint size 1/2/4/8 supported */
static int access_size[SIZE_NUM] = {
[SIZE_ANY] = 0,
[SIZE_1B] = 1,
[SIZE_2B] = 2,
[SIZE_4B] = 4,
[SIZE_6B] = -1,
[SIZE_8B] = 8,
[6 ... 15] = -1,
};
static inline target_ulong extract_trigger_type(CPURISCVState *env,
target_ulong tdata1)
{
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
return extract32(tdata1, 28, 4);
case MXL_RV64:
case MXL_RV128:
return extract64(tdata1, 60, 4);
default:
g_assert_not_reached();
}
}
static inline target_ulong get_trigger_type(CPURISCVState *env,
target_ulong trigger_index)
{
return extract_trigger_type(env, env->tdata1[trigger_index]);
}
static trigger_action_t get_trigger_action(CPURISCVState *env,
target_ulong trigger_index)
{
target_ulong tdata1 = env->tdata1[trigger_index];
int trigger_type = get_trigger_type(env, trigger_index);
trigger_action_t action = DBG_ACTION_NONE;
switch (trigger_type) {
case TRIGGER_TYPE_AD_MATCH:
action = (tdata1 & TYPE2_ACTION) >> 12;
break;
case TRIGGER_TYPE_AD_MATCH6:
action = (tdata1 & TYPE6_ACTION) >> 12;
break;
case TRIGGER_TYPE_INST_CNT:
case TRIGGER_TYPE_INT:
case TRIGGER_TYPE_EXCP:
case TRIGGER_TYPE_EXT_SRC:
qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n",
trigger_type);
break;
case TRIGGER_TYPE_NO_EXIST:
case TRIGGER_TYPE_UNAVAIL:
qemu_log_mask(LOG_GUEST_ERROR, "trigger type: %d does not exit\n",
trigger_type);
break;
default:
g_assert_not_reached();
}
return action;
}
static inline target_ulong build_tdata1(CPURISCVState *env,
trigger_type_t type,
bool dmode, target_ulong data)
{
target_ulong tdata1;
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
tdata1 = RV32_TYPE(type) |
(dmode ? RV32_DMODE : 0) |
(data & RV32_DATA_MASK);
break;
case MXL_RV64:
case MXL_RV128:
tdata1 = RV64_TYPE(type) |
(dmode ? RV64_DMODE : 0) |
(data & RV64_DATA_MASK);
break;
default:
g_assert_not_reached();
}
return tdata1;
}
bool tdata_available(CPURISCVState *env, int tdata_index)
{
int trigger_type = get_trigger_type(env, env->trigger_cur);
if (unlikely(tdata_index >= TDATA_NUM)) {
return false;
}
return tdata_mapping[trigger_type][tdata_index];
}
target_ulong tselect_csr_read(CPURISCVState *env)
{
return env->trigger_cur;
}
void tselect_csr_write(CPURISCVState *env, target_ulong val)
{
if (val < RV_MAX_TRIGGERS) {
env->trigger_cur = val;
}
}
static target_ulong tdata1_validate(CPURISCVState *env, target_ulong val,
trigger_type_t t)
{
uint32_t type, dmode;
target_ulong tdata1;
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
type = extract32(val, 28, 4);
dmode = extract32(val, 27, 1);
tdata1 = RV32_TYPE(t);
break;
case MXL_RV64:
case MXL_RV128:
type = extract64(val, 60, 4);
dmode = extract64(val, 59, 1);
tdata1 = RV64_TYPE(t);
break;
default:
g_assert_not_reached();
}
if (type != t) {
qemu_log_mask(LOG_GUEST_ERROR,
"ignoring type write to tdata1 register\n");
}
if (dmode != 0) {
qemu_log_mask(LOG_UNIMP, "debug mode is not supported\n");
}
return tdata1;
}
static inline void warn_always_zero_bit(target_ulong val, target_ulong mask,
const char *msg)
{
if (val & mask) {
qemu_log_mask(LOG_UNIMP, "%s bit is always zero\n", msg);
}
}
static target_ulong textra_validate(CPURISCVState *env, target_ulong tdata3)
{
target_ulong mhvalue, mhselect;
target_ulong mhselect_new;
target_ulong textra;
const uint32_t mhselect_no_rvh[8] = { 0, 0, 0, 0, 4, 4, 4, 4 };
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
mhvalue = get_field(tdata3, TEXTRA32_MHVALUE);
mhselect = get_field(tdata3, TEXTRA32_MHSELECT);
/* Validate unimplemented (always zero) bits */
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA32_SBYTEMASK,
"sbytemask");
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA32_SVALUE,
"svalue");
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA32_SSELECT,
"sselect");
break;
case MXL_RV64:
case MXL_RV128:
mhvalue = get_field(tdata3, TEXTRA64_MHVALUE);
mhselect = get_field(tdata3, TEXTRA64_MHSELECT);
/* Validate unimplemented (always zero) bits */
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA64_SBYTEMASK,
"sbytemask");
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA64_SVALUE,
"svalue");
warn_always_zero_bit(tdata3, (target_ulong)TEXTRA64_SSELECT,
"sselect");
break;
default:
g_assert_not_reached();
}
/* Validate mhselect. */
mhselect_new = mhselect_no_rvh[mhselect];
if (mhselect != mhselect_new) {
qemu_log_mask(LOG_UNIMP, "mhselect only supports 0 or 4 for now\n");
}
/* Write legal values into textra */
textra = 0;
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
textra = set_field(textra, TEXTRA32_MHVALUE, mhvalue);
textra = set_field(textra, TEXTRA32_MHSELECT, mhselect_new);
break;
case MXL_RV64:
case MXL_RV128:
textra = set_field(textra, TEXTRA64_MHVALUE, mhvalue);
textra = set_field(textra, TEXTRA64_MHSELECT, mhselect_new);
break;
default:
g_assert_not_reached();
}
return textra;
}
static void do_trigger_action(CPURISCVState *env, target_ulong trigger_index)
{
trigger_action_t action = get_trigger_action(env, trigger_index);
switch (action) {
case DBG_ACTION_NONE:
break;
case DBG_ACTION_BP:
riscv_raise_exception(env, RISCV_EXCP_BREAKPOINT, 0);
break;
case DBG_ACTION_DBG_MODE:
case DBG_ACTION_TRACE0:
case DBG_ACTION_TRACE1:
case DBG_ACTION_TRACE2:
case DBG_ACTION_TRACE3:
case DBG_ACTION_EXT_DBG0:
case DBG_ACTION_EXT_DBG1:
qemu_log_mask(LOG_UNIMP, "action: %d is not supported\n", action);
break;
default:
g_assert_not_reached();
}
}
/*
* Check the privilege level of specific trigger matches CPU's current privilege
* level.
*/
static bool trigger_priv_match(CPURISCVState *env, trigger_type_t type,
int trigger_index)
{
target_ulong ctrl = env->tdata1[trigger_index];
switch (type) {
case TRIGGER_TYPE_AD_MATCH:
/* type 2 trigger cannot be fired in VU/VS mode */
if (env->virt_enabled) {
return false;
}
/* check U/S/M bit against current privilege level */
if ((ctrl >> 3) & BIT(env->priv)) {
return true;
}
break;
case TRIGGER_TYPE_AD_MATCH6:
if (env->virt_enabled) {
/* check VU/VS bit against current privilege level */
if ((ctrl >> 23) & BIT(env->priv)) {
return true;
}
} else {
/* check U/S/M bit against current privilege level */
if ((ctrl >> 3) & BIT(env->priv)) {
return true;
}
}
break;
case TRIGGER_TYPE_INST_CNT:
if (env->virt_enabled) {
/* check VU/VS bit against current privilege level */
if ((ctrl >> 25) & BIT(env->priv)) {
return true;
}
} else {
/* check U/S/M bit against current privilege level */
if ((ctrl >> 6) & BIT(env->priv)) {
return true;
}
}
break;
case TRIGGER_TYPE_INT:
case TRIGGER_TYPE_EXCP:
case TRIGGER_TYPE_EXT_SRC:
qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n", type);
break;
case TRIGGER_TYPE_NO_EXIST:
case TRIGGER_TYPE_UNAVAIL:
qemu_log_mask(LOG_GUEST_ERROR, "trigger type: %d does not exist\n",
type);
break;
default:
g_assert_not_reached();
}
return false;
}
static bool trigger_textra_match(CPURISCVState *env, trigger_type_t type,
int trigger_index)
{
target_ulong textra = env->tdata3[trigger_index];
target_ulong mhvalue, mhselect;
if (type < TRIGGER_TYPE_AD_MATCH || type > TRIGGER_TYPE_AD_MATCH6) {
/* textra checking is only applicable when type is 2, 3, 4, 5, or 6 */
return true;
}
switch (riscv_cpu_mxl(env)) {
case MXL_RV32:
mhvalue = get_field(textra, TEXTRA32_MHVALUE);
mhselect = get_field(textra, TEXTRA32_MHSELECT);
break;
case MXL_RV64:
case MXL_RV128:
mhvalue = get_field(textra, TEXTRA64_MHVALUE);
mhselect = get_field(textra, TEXTRA64_MHSELECT);
break;
default:
g_assert_not_reached();
}
/* Check mhvalue and mhselect. */
switch (mhselect) {
case MHSELECT_IGNORE:
break;
case MHSELECT_MCONTEXT:
/* Match if the low bits of mcontext/hcontext equal mhvalue. */
if (mhvalue != env->mcontext) {
return false;
}
break;
default:
break;
}
return true;
}
/* Common matching conditions for all types of the triggers. */
static bool trigger_common_match(CPURISCVState *env, trigger_type_t type,
int trigger_index)
{
return trigger_priv_match(env, type, trigger_index) &&
trigger_textra_match(env, type, trigger_index);
}
/* type 2 trigger */
static uint32_t type2_breakpoint_size(CPURISCVState *env, target_ulong ctrl)
{
uint32_t sizelo, sizehi = 0;
if (riscv_cpu_mxl(env) == MXL_RV64) {
sizehi = extract32(ctrl, 21, 2);
}
sizelo = extract32(ctrl, 16, 2);
return (sizehi << 2) | sizelo;
}
static inline bool type2_breakpoint_enabled(target_ulong ctrl)
{
bool mode = !!(ctrl & (TYPE2_U | TYPE2_S | TYPE2_M));
bool rwx = !!(ctrl & (TYPE2_LOAD | TYPE2_STORE | TYPE2_EXEC));
return mode && rwx;
}
static target_ulong type2_mcontrol_validate(CPURISCVState *env,
target_ulong ctrl)
{
target_ulong val;
uint32_t size;
/* validate the generic part first */
val = tdata1_validate(env, ctrl, TRIGGER_TYPE_AD_MATCH);
/* validate unimplemented (always zero) bits */
warn_always_zero_bit(ctrl, TYPE2_MATCH, "match");
warn_always_zero_bit(ctrl, TYPE2_CHAIN, "chain");
warn_always_zero_bit(ctrl, TYPE2_ACTION, "action");
warn_always_zero_bit(ctrl, TYPE2_TIMING, "timing");
warn_always_zero_bit(ctrl, TYPE2_SELECT, "select");
warn_always_zero_bit(ctrl, TYPE2_HIT, "hit");
/* validate size encoding */
size = type2_breakpoint_size(env, ctrl);
if (access_size[size] == -1) {
qemu_log_mask(LOG_UNIMP, "access size %d is not supported, using "
"SIZE_ANY\n", size);
} else {
val |= (ctrl & TYPE2_SIZELO);
if (riscv_cpu_mxl(env) == MXL_RV64) {
val |= (ctrl & TYPE2_SIZEHI);
}
}
/* keep the mode and attribute bits */
val |= (ctrl & (TYPE2_U | TYPE2_S | TYPE2_M |
TYPE2_LOAD | TYPE2_STORE | TYPE2_EXEC));
return val;
}
static void type2_breakpoint_insert(CPURISCVState *env, target_ulong index)
{
target_ulong ctrl = env->tdata1[index];
target_ulong addr = env->tdata2[index];
bool enabled = type2_breakpoint_enabled(ctrl);
CPUState *cs = env_cpu(env);
int flags = BP_CPU | BP_STOP_BEFORE_ACCESS;
uint32_t size;
if (!enabled) {
return;
}
if (ctrl & TYPE2_EXEC) {
cpu_breakpoint_insert(cs, addr, flags, &env->cpu_breakpoint[index]);
}
if (ctrl & TYPE2_LOAD) {
flags |= BP_MEM_READ;
}
if (ctrl & TYPE2_STORE) {
flags |= BP_MEM_WRITE;
}
if (flags & BP_MEM_ACCESS) {
size = type2_breakpoint_size(env, ctrl);
if (size != 0) {
cpu_watchpoint_insert(cs, addr, size, flags,
&env->cpu_watchpoint[index]);
} else {
cpu_watchpoint_insert(cs, addr, 8, flags,
&env->cpu_watchpoint[index]);
}
}
}
static void type2_breakpoint_remove(CPURISCVState *env, target_ulong index)
{
CPUState *cs = env_cpu(env);
if (env->cpu_breakpoint[index]) {
cpu_breakpoint_remove_by_ref(cs, env->cpu_breakpoint[index]);
env->cpu_breakpoint[index] = NULL;
}
if (env->cpu_watchpoint[index]) {
cpu_watchpoint_remove_by_ref(cs, env->cpu_watchpoint[index]);
env->cpu_watchpoint[index] = NULL;
}
}
static void type2_reg_write(CPURISCVState *env, target_ulong index,
int tdata_index, target_ulong val)
{
target_ulong new_val;
switch (tdata_index) {
case TDATA1:
new_val = type2_mcontrol_validate(env, val);
if (new_val != env->tdata1[index]) {
env->tdata1[index] = new_val;
type2_breakpoint_remove(env, index);
type2_breakpoint_insert(env, index);
}
break;
case TDATA2:
if (val != env->tdata2[index]) {
env->tdata2[index] = val;
type2_breakpoint_remove(env, index);
type2_breakpoint_insert(env, index);
}
break;
case TDATA3:
env->tdata3[index] = textra_validate(env, val);
break;
default:
g_assert_not_reached();
}
return;
}
/* type 6 trigger */
static inline bool type6_breakpoint_enabled(target_ulong ctrl)
{
bool mode = !!(ctrl & (TYPE6_VU | TYPE6_VS | TYPE6_U | TYPE6_S | TYPE6_M));
bool rwx = !!(ctrl & (TYPE6_LOAD | TYPE6_STORE | TYPE6_EXEC));
return mode && rwx;
}
static target_ulong type6_mcontrol6_validate(CPURISCVState *env,
target_ulong ctrl)
{
target_ulong val;
uint32_t size;
/* validate the generic part first */
val = tdata1_validate(env, ctrl, TRIGGER_TYPE_AD_MATCH6);
/* validate unimplemented (always zero) bits */
warn_always_zero_bit(ctrl, TYPE6_MATCH, "match");
warn_always_zero_bit(ctrl, TYPE6_CHAIN, "chain");
warn_always_zero_bit(ctrl, TYPE6_ACTION, "action");
warn_always_zero_bit(ctrl, TYPE6_TIMING, "timing");
warn_always_zero_bit(ctrl, TYPE6_SELECT, "select");
warn_always_zero_bit(ctrl, TYPE6_HIT, "hit");
/* validate size encoding */
size = extract32(ctrl, 16, 4);
if (access_size[size] == -1) {
qemu_log_mask(LOG_UNIMP, "access size %d is not supported, using "
"SIZE_ANY\n", size);
} else {
val |= (ctrl & TYPE6_SIZE);
}
/* keep the mode and attribute bits */
val |= (ctrl & (TYPE6_VU | TYPE6_VS | TYPE6_U | TYPE6_S | TYPE6_M |
TYPE6_LOAD | TYPE6_STORE | TYPE6_EXEC));
return val;
}
static void type6_breakpoint_insert(CPURISCVState *env, target_ulong index)
{
target_ulong ctrl = env->tdata1[index];
target_ulong addr = env->tdata2[index];
bool enabled = type6_breakpoint_enabled(ctrl);
CPUState *cs = env_cpu(env);
int flags = BP_CPU | BP_STOP_BEFORE_ACCESS;
uint32_t size;
if (!enabled) {
return;
}
if (ctrl & TYPE6_EXEC) {
cpu_breakpoint_insert(cs, addr, flags, &env->cpu_breakpoint[index]);
}
if (ctrl & TYPE6_LOAD) {
flags |= BP_MEM_READ;
}
if (ctrl & TYPE6_STORE) {
flags |= BP_MEM_WRITE;
}
if (flags & BP_MEM_ACCESS) {
size = extract32(ctrl, 16, 4);
if (size != 0) {
cpu_watchpoint_insert(cs, addr, size, flags,
&env->cpu_watchpoint[index]);
} else {
cpu_watchpoint_insert(cs, addr, 8, flags,
&env->cpu_watchpoint[index]);
}
}
}
static void type6_breakpoint_remove(CPURISCVState *env, target_ulong index)
{
type2_breakpoint_remove(env, index);
}
static void type6_reg_write(CPURISCVState *env, target_ulong index,
int tdata_index, target_ulong val)
{
target_ulong new_val;
switch (tdata_index) {
case TDATA1:
new_val = type6_mcontrol6_validate(env, val);
if (new_val != env->tdata1[index]) {
env->tdata1[index] = new_val;
type6_breakpoint_remove(env, index);
type6_breakpoint_insert(env, index);
}
break;
case TDATA2:
if (val != env->tdata2[index]) {
env->tdata2[index] = val;
type6_breakpoint_remove(env, index);
type6_breakpoint_insert(env, index);
}
break;
case TDATA3:
env->tdata3[index] = textra_validate(env, val);
break;
default:
g_assert_not_reached();
}
return;
}
/* icount trigger type */
static inline int
itrigger_get_count(CPURISCVState *env, int index)
{
return get_field(env->tdata1[index], ITRIGGER_COUNT);
}
static inline void
itrigger_set_count(CPURISCVState *env, int index, int value)
{
env->tdata1[index] = set_field(env->tdata1[index],
ITRIGGER_COUNT, value);
}
static bool check_itrigger_priv(CPURISCVState *env, int index)
{
target_ulong tdata1 = env->tdata1[index];
if (env->virt_enabled) {
/* check VU/VS bit against current privilege level */
return (get_field(tdata1, ITRIGGER_VS) == env->priv) ||
(get_field(tdata1, ITRIGGER_VU) == env->priv);
} else {
/* check U/S/M bit against current privilege level */
return (get_field(tdata1, ITRIGGER_M) == env->priv) ||
(get_field(tdata1, ITRIGGER_S) == env->priv) ||
(get_field(tdata1, ITRIGGER_U) == env->priv);
}
}
bool riscv_itrigger_enabled(CPURISCVState *env)
{
int count;
for (int i = 0; i < RV_MAX_TRIGGERS; i++) {
if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) {
continue;
}
if (check_itrigger_priv(env, i)) {
continue;
}
count = itrigger_get_count(env, i);
if (!count) {
continue;
}
return true;
}
return false;
}
void helper_itrigger_match(CPURISCVState *env)
{
int count;
for (int i = 0; i < RV_MAX_TRIGGERS; i++) {
if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) {
continue;
}
if (!trigger_common_match(env, TRIGGER_TYPE_INST_CNT, i)) {
continue;
}
count = itrigger_get_count(env, i);
if (!count) {
continue;
}
itrigger_set_count(env, i, count--);
if (!count) {
env->itrigger_enabled = riscv_itrigger_enabled(env);
do_trigger_action(env, i);
}
}
}
static void riscv_itrigger_update_count(CPURISCVState *env)
{
int count, executed;
/*
* Record last icount, so that we can evaluate the executed instructions
* since last privilege mode change or timer expire.
*/
int64_t last_icount = env->last_icount, current_icount;
current_icount = env->last_icount = icount_get_raw();
for (int i = 0; i < RV_MAX_TRIGGERS; i++) {
if (get_trigger_type(env, i) != TRIGGER_TYPE_INST_CNT) {
continue;
}
count = itrigger_get_count(env, i);
if (!count) {
continue;
}
/*
* Only when privilege is changed or itrigger timer expires,
* the count field in itrigger tdata1 register is updated.
* And the count field in itrigger only contains remaining value.
*/
if (check_itrigger_priv(env, i)) {
/*
* If itrigger enabled in this privilege mode, the number of
* executed instructions since last privilege change
* should be reduced from current itrigger count.
*/
executed = current_icount - last_icount;
itrigger_set_count(env, i, count - executed);
if (count == executed) {
do_trigger_action(env, i);
}
} else {
/*
* If itrigger is not enabled in this privilege mode,
* the number of executed instructions will be discard and
* the count field in itrigger will not change.
*/
timer_mod(env->itrigger_timer[i],
current_icount + count);
}
}
}
static void riscv_itrigger_timer_cb(void *opaque)
{
riscv_itrigger_update_count((CPURISCVState *)opaque);
}
void riscv_itrigger_update_priv(CPURISCVState *env)
{
riscv_itrigger_update_count(env);
}
static target_ulong itrigger_validate(CPURISCVState *env,
target_ulong ctrl)
{
target_ulong val;
/* validate the generic part first */
val = tdata1_validate(env, ctrl, TRIGGER_TYPE_INST_CNT);
/* validate unimplemented (always zero) bits */
warn_always_zero_bit(ctrl, ITRIGGER_ACTION, "action");
warn_always_zero_bit(ctrl, ITRIGGER_HIT, "hit");
warn_always_zero_bit(ctrl, ITRIGGER_PENDING, "pending");
/* keep the mode and attribute bits */
val |= ctrl & (ITRIGGER_VU | ITRIGGER_VS | ITRIGGER_U | ITRIGGER_S |
ITRIGGER_M | ITRIGGER_COUNT);
return val;
}
static void itrigger_reg_write(CPURISCVState *env, target_ulong index,
int tdata_index, target_ulong val)
{
target_ulong new_val;
switch (tdata_index) {
case TDATA1:
/* set timer for icount */
new_val = itrigger_validate(env, val);
if (new_val != env->tdata1[index]) {
env->tdata1[index] = new_val;
if (icount_enabled()) {
env->last_icount = icount_get_raw();
/* set the count to timer */
timer_mod(env->itrigger_timer[index],
env->last_icount + itrigger_get_count(env, index));
} else {
env->itrigger_enabled = riscv_itrigger_enabled(env);
}
}
break;
case TDATA2:
qemu_log_mask(LOG_UNIMP,
"tdata2 is not supported for icount trigger\n");
break;
case TDATA3:
env->tdata3[index] = textra_validate(env, val);
break;
default:
g_assert_not_reached();
}
return;
}
static int itrigger_get_adjust_count(CPURISCVState *env)
{
int count = itrigger_get_count(env, env->trigger_cur), executed;
if ((count != 0) && check_itrigger_priv(env, env->trigger_cur)) {
executed = icount_get_raw() - env->last_icount;
count += executed;
}
return count;
}
target_ulong tdata_csr_read(CPURISCVState *env, int tdata_index)
{
int trigger_type;
switch (tdata_index) {
case TDATA1:
trigger_type = extract_trigger_type(env,
env->tdata1[env->trigger_cur]);
if ((trigger_type == TRIGGER_TYPE_INST_CNT) && icount_enabled()) {
return deposit64(env->tdata1[env->trigger_cur], 10, 14,
itrigger_get_adjust_count(env));
}
return env->tdata1[env->trigger_cur];
case TDATA2:
return env->tdata2[env->trigger_cur];
case TDATA3:
return env->tdata3[env->trigger_cur];
default:
g_assert_not_reached();
}
}
void tdata_csr_write(CPURISCVState *env, int tdata_index, target_ulong val)
{
int trigger_type;
if (tdata_index == TDATA1) {
trigger_type = extract_trigger_type(env, val);
} else {
trigger_type = get_trigger_type(env, env->trigger_cur);
}
switch (trigger_type) {
case TRIGGER_TYPE_AD_MATCH:
type2_reg_write(env, env->trigger_cur, tdata_index, val);
break;
case TRIGGER_TYPE_AD_MATCH6:
type6_reg_write(env, env->trigger_cur, tdata_index, val);
break;
case TRIGGER_TYPE_INST_CNT:
itrigger_reg_write(env, env->trigger_cur, tdata_index, val);
break;
case TRIGGER_TYPE_INT:
case TRIGGER_TYPE_EXCP:
case TRIGGER_TYPE_EXT_SRC:
qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n",
trigger_type);
break;
case TRIGGER_TYPE_NO_EXIST:
case TRIGGER_TYPE_UNAVAIL:
qemu_log_mask(LOG_GUEST_ERROR, "trigger type: %d does not exit\n",
trigger_type);
break;
default:
g_assert_not_reached();
}
}
target_ulong tinfo_csr_read(CPURISCVState *env)
{
/* assume all triggers support the same types of triggers */
return BIT(TRIGGER_TYPE_AD_MATCH) |
BIT(TRIGGER_TYPE_AD_MATCH6);
}
void riscv_cpu_debug_excp_handler(CPUState *cs)
{
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
if (cs->watchpoint_hit) {
if (cs->watchpoint_hit->flags & BP_CPU) {
do_trigger_action(env, DBG_ACTION_BP);
}
} else {
if (cpu_breakpoint_test(cs, env->pc, BP_CPU)) {
do_trigger_action(env, DBG_ACTION_BP);
}
}
}
bool riscv_cpu_debug_check_breakpoint(CPUState *cs)
{
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
CPUBreakpoint *bp;
target_ulong ctrl;
target_ulong pc;
int trigger_type;
int i;
QTAILQ_FOREACH(bp, &cs->breakpoints, entry) {
for (i = 0; i < RV_MAX_TRIGGERS; i++) {
trigger_type = get_trigger_type(env, i);
if (!trigger_common_match(env, trigger_type, i)) {
continue;
}
switch (trigger_type) {
case TRIGGER_TYPE_AD_MATCH:
ctrl = env->tdata1[i];
pc = env->tdata2[i];
if ((ctrl & TYPE2_EXEC) && (bp->pc == pc)) {
env->badaddr = pc;
return true;
}
break;
case TRIGGER_TYPE_AD_MATCH6:
ctrl = env->tdata1[i];
pc = env->tdata2[i];
if ((ctrl & TYPE6_EXEC) && (bp->pc == pc)) {
env->badaddr = pc;
return true;
}
break;
default:
/* other trigger types are not supported or irrelevant */
break;
}
}
}
return false;
}
bool riscv_cpu_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp)
{
RISCVCPU *cpu = RISCV_CPU(cs);
CPURISCVState *env = &cpu->env;
target_ulong ctrl;
target_ulong addr;
int trigger_type;
int flags;
int i;
for (i = 0; i < RV_MAX_TRIGGERS; i++) {
trigger_type = get_trigger_type(env, i);
if (!trigger_common_match(env, trigger_type, i)) {
continue;
}
switch (trigger_type) {
case TRIGGER_TYPE_AD_MATCH:
ctrl = env->tdata1[i];
addr = env->tdata2[i];
flags = 0;
if (ctrl & TYPE2_LOAD) {
flags |= BP_MEM_READ;
}
if (ctrl & TYPE2_STORE) {
flags |= BP_MEM_WRITE;
}
if ((wp->flags & flags) && (wp->vaddr == addr)) {
return true;
}
break;
case TRIGGER_TYPE_AD_MATCH6:
ctrl = env->tdata1[i];
addr = env->tdata2[i];
flags = 0;
if (ctrl & TYPE6_LOAD) {
flags |= BP_MEM_READ;
}
if (ctrl & TYPE6_STORE) {
flags |= BP_MEM_WRITE;
}
if ((wp->flags & flags) && (wp->vaddr == addr)) {
return true;
}
break;
default:
/* other trigger types are not supported */
break;
}
}
return false;
}
void riscv_trigger_realize(CPURISCVState *env)
{
int i;
for (i = 0; i < RV_MAX_TRIGGERS; i++) {
env->itrigger_timer[i] = timer_new_ns(QEMU_CLOCK_VIRTUAL,
riscv_itrigger_timer_cb, env);
}
}
void riscv_trigger_reset_hold(CPURISCVState *env)
{
target_ulong tdata1 = build_tdata1(env, TRIGGER_TYPE_AD_MATCH, 0, 0);
int i;
/* init to type 2 triggers */
for (i = 0; i < RV_MAX_TRIGGERS; i++) {
/*
* type = TRIGGER_TYPE_AD_MATCH
* dmode = 0 (both debug and M-mode can write tdata)
* maskmax = 0 (unimplemented, always 0)
* sizehi = 0 (match against any size, RV64 only)
* hit = 0 (unimplemented, always 0)
* select = 0 (always 0, perform match on address)
* timing = 0 (always 0, trigger before instruction)
* sizelo = 0 (match against any size)
* action = 0 (always 0, raise a breakpoint exception)
* chain = 0 (unimplemented, always 0)
* match = 0 (always 0, when any compare value equals tdata2)
*/
env->tdata1[i] = tdata1;
env->tdata2[i] = 0;
env->tdata3[i] = 0;
env->cpu_breakpoint[i] = NULL;
env->cpu_watchpoint[i] = NULL;
timer_del(env->itrigger_timer[i]);
}
env->mcontext = 0;
}
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