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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <helper/time_support.h>
#include <jtag/jtag.h>
#include "target/target.h"
#include "target/target_type.h"
#include "target/register.h"
#include <target/smp.h>
#include "rtos.h"
#include "helper/log.h"
#include "helper/types.h"
#include "server/gdb_server.h"
static bool hwthread_detect_rtos(struct target *target);
static int hwthread_create(struct target *target);
static int hwthread_update_threads(struct rtos *rtos);
static int hwthread_get_thread_reg(struct rtos *rtos, int64_t thread_id,
uint32_t reg_num, struct rtos_reg *rtos_reg);
static int hwthread_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
struct rtos_reg **reg_list, int *num_regs);
static int hwthread_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[]);
static int hwthread_smp_init(struct target *target);
static int hwthread_set_reg(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value);
static int hwthread_read_buffer(struct rtos *rtos, target_addr_t address,
uint32_t size, uint8_t *buffer);
static int hwthread_write_buffer(struct rtos *rtos, target_addr_t address,
uint32_t size, const uint8_t *buffer);
#define HW_THREAD_NAME_STR_SIZE (32)
extern int rtos_thread_packet(struct connection *connection, const char *packet, int packet_size);
static inline threadid_t threadid_from_target(const struct target *target)
{
return target->coreid + 1;
}
const struct rtos_type hwthread_rtos = {
.name = "hwthread",
.detect_rtos = hwthread_detect_rtos,
.create = hwthread_create,
.update_threads = hwthread_update_threads,
.get_thread_reg_list = hwthread_get_thread_reg_list,
.get_thread_reg = hwthread_get_thread_reg,
.get_symbol_list_to_lookup = hwthread_get_symbol_list_to_lookup,
.smp_init = hwthread_smp_init,
.set_reg = hwthread_set_reg,
.read_buffer = hwthread_read_buffer,
.write_buffer = hwthread_write_buffer,
};
struct hwthread_params {
int dummy_param;
};
static int hwthread_fill_thread(struct rtos *rtos, struct target *curr, int thread_num)
{
char tmp_str[HW_THREAD_NAME_STR_SIZE];
threadid_t tid = threadid_from_target(curr);
memset(tmp_str, 0, HW_THREAD_NAME_STR_SIZE);
/* thread-id is the core-id of this core inside the SMP group plus 1 */
rtos->thread_details[thread_num].threadid = tid;
/* create the thread name */
rtos->thread_details[thread_num].exists = true;
rtos->thread_details[thread_num].thread_name_str = strdup(target_name(curr));
snprintf(tmp_str, HW_THREAD_NAME_STR_SIZE-1, "state: %s", debug_reason_name(curr));
rtos->thread_details[thread_num].extra_info_str = strdup(tmp_str);
return ERROR_OK;
}
static int hwthread_update_threads(struct rtos *rtos)
{
int threads_found = 0;
int thread_list_size = 0;
struct target_list *head;
struct target *target;
int64_t current_thread = 0;
enum target_debug_reason current_reason = DBG_REASON_UNDEFINED;
if (!rtos)
return -1;
target = rtos->target;
/* wipe out previous thread details if any */
rtos_free_threadlist(rtos);
/* determine the number of "threads" */
if (target->smp) {
foreach_smp_target(head, target->smp_targets) {
struct target *curr = head->target;
if (!target_was_examined(curr))
continue;
++thread_list_size;
}
} else
thread_list_size = 1;
/* create space for new thread details */
rtos->thread_details = malloc(sizeof(struct thread_detail) * thread_list_size);
if (target->smp) {
/* loop over all threads */
foreach_smp_target(head, target->smp_targets) {
struct target *curr = head->target;
if (!target_was_examined(curr))
continue;
threadid_t tid = threadid_from_target(curr);
hwthread_fill_thread(rtos, curr, threads_found);
/* find an interesting thread to set as current */
switch (current_reason) {
case DBG_REASON_UNDEFINED:
current_reason = curr->debug_reason;
current_thread = tid;
break;
case DBG_REASON_SINGLESTEP:
/* single-step can only be overridden by itself */
if (curr->debug_reason == DBG_REASON_SINGLESTEP) {
if (tid == rtos->current_threadid)
current_thread = tid;
}
break;
case DBG_REASON_BREAKPOINT:
/* single-step overrides breakpoint */
if (curr->debug_reason == DBG_REASON_SINGLESTEP) {
current_reason = curr->debug_reason;
current_thread = tid;
} else
/* multiple breakpoints, prefer gdbs' threadid */
if (curr->debug_reason == DBG_REASON_BREAKPOINT) {
if (tid == rtos->current_threadid)
current_thread = tid;
}
break;
case DBG_REASON_WATCHPOINT:
/* breakpoint and single-step override watchpoint */
if (curr->debug_reason == DBG_REASON_SINGLESTEP ||
curr->debug_reason == DBG_REASON_BREAKPOINT) {
current_reason = curr->debug_reason;
current_thread = tid;
}
break;
case DBG_REASON_DBGRQ:
/* all other reasons override debug-request */
if (curr->debug_reason == DBG_REASON_SINGLESTEP ||
curr->debug_reason == DBG_REASON_WATCHPOINT ||
curr->debug_reason == DBG_REASON_BREAKPOINT) {
current_reason = curr->debug_reason;
current_thread = tid;
} else
if (curr->debug_reason == DBG_REASON_DBGRQ) {
if (tid == rtos->current_threadid)
current_thread = tid;
}
break;
default:
break;
}
threads_found++;
}
} else {
hwthread_fill_thread(rtos, target, threads_found);
current_thread = threadid_from_target(target);
threads_found++;
}
rtos->thread_count = threads_found;
/* we found an interesting thread, set it as current */
if (current_thread != 0)
rtos->current_thread = current_thread;
else if (rtos->current_threadid != 0)
rtos->current_thread = rtos->current_threadid;
else
rtos->current_thread = threadid_from_target(target);
LOG_DEBUG("%s current_thread=%i", __func__, (int)rtos->current_thread);
return 0;
}
static int hwthread_smp_init(struct target *target)
{
return hwthread_update_threads(target->rtos);
}
static struct target *hwthread_find_thread(struct target *target, int64_t thread_id)
{
/* Find the thread with that thread_id */
if (!target)
return NULL;
if (target->smp) {
struct target_list *head;
foreach_smp_target(head, target->smp_targets) {
if (thread_id == threadid_from_target(head->target))
return head->target;
}
} else if (thread_id == threadid_from_target(target)) {
return target;
}
return NULL;
}
static int hwthread_get_thread_reg_list(struct rtos *rtos, int64_t thread_id,
struct rtos_reg **rtos_reg_list, int *rtos_reg_list_size)
{
if (!rtos)
return ERROR_FAIL;
struct target *target = rtos->target;
struct target *curr = hwthread_find_thread(target, thread_id);
if (!curr)
return ERROR_FAIL;
if (!target_was_examined(curr))
return ERROR_FAIL;
int reg_list_size;
struct reg **reg_list;
int retval = target_get_gdb_reg_list(curr, ®_list, ®_list_size,
REG_CLASS_GENERAL);
if (retval != ERROR_OK)
return retval;
int j = 0;
for (int i = 0; i < reg_list_size; i++) {
if (!reg_list[i] || reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
j++;
}
*rtos_reg_list_size = j;
*rtos_reg_list = calloc(*rtos_reg_list_size, sizeof(struct rtos_reg));
if (!*rtos_reg_list) {
free(reg_list);
return ERROR_FAIL;
}
j = 0;
for (int i = 0; i < reg_list_size; i++) {
if (!reg_list[i] || reg_list[i]->exist == false || reg_list[i]->hidden)
continue;
(*rtos_reg_list)[j].number = (*reg_list)[i].number;
(*rtos_reg_list)[j].size = (*reg_list)[i].size;
memcpy((*rtos_reg_list)[j].value, (*reg_list)[i].value,
((*reg_list)[i].size + 7) / 8);
j++;
}
free(reg_list);
return ERROR_OK;
}
static int hwthread_get_thread_reg(struct rtos *rtos, int64_t thread_id,
uint32_t reg_num, struct rtos_reg *rtos_reg)
{
if (!rtos)
return ERROR_FAIL;
struct target *target = rtos->target;
struct target *curr = hwthread_find_thread(target, thread_id);
if (!curr) {
LOG_ERROR("Couldn't find RTOS thread for id %" PRId64 ".", thread_id);
return ERROR_FAIL;
}
if (!target_was_examined(curr)) {
LOG_ERROR("Target %d hasn't been examined yet.", curr->coreid);
return ERROR_FAIL;
}
struct reg *reg = register_get_by_number(curr->reg_cache, reg_num, true);
if (!reg) {
LOG_ERROR("Couldn't find register %" PRIu32 " in thread %" PRId64 ".", reg_num,
thread_id);
return ERROR_FAIL;
}
if (reg->type->get(reg) != ERROR_OK)
return ERROR_FAIL;
rtos_reg->number = reg->number;
rtos_reg->size = reg->size;
unsigned bytes = (reg->size + 7) / 8;
assert(bytes <= sizeof(rtos_reg->value));
memcpy(rtos_reg->value, reg->value, bytes);
return ERROR_OK;
}
static int hwthread_set_reg(struct rtos *rtos, uint32_t reg_num, uint8_t *reg_value)
{
if (!rtos)
return ERROR_FAIL;
struct target *target = rtos->target;
struct target *curr = hwthread_find_thread(target, rtos->current_thread);
if (!curr)
return ERROR_FAIL;
struct reg *reg = register_get_by_number(curr->reg_cache, reg_num, true);
if (!reg)
return ERROR_FAIL;
return reg->type->set(reg, reg_value);
}
static int hwthread_get_symbol_list_to_lookup(struct symbol_table_elem *symbol_list[])
{
/* return an empty list, we don't have any symbols to look up */
*symbol_list = calloc(1, sizeof(struct symbol_table_elem));
(*symbol_list)[0].symbol_name = NULL;
return 0;
}
static int hwthread_target_for_threadid(struct connection *connection, int64_t thread_id, struct target **p_target)
{
struct target *target = get_target_from_connection(connection);
struct target *curr = hwthread_find_thread(target, thread_id);
if (!curr)
return ERROR_FAIL;
*p_target = curr;
return ERROR_OK;
}
static bool hwthread_detect_rtos(struct target *target)
{
/* always return 0, avoid auto-detection */
return false;
}
static int hwthread_thread_packet(struct connection *connection, const char *packet, int packet_size)
{
struct target *target = get_target_from_connection(connection);
struct target *curr = NULL;
int64_t current_threadid;
if (packet[0] == 'H' && packet[1] == 'g') {
sscanf(packet, "Hg%16" SCNx64, ¤t_threadid);
if (current_threadid > 0) {
if (hwthread_target_for_threadid(connection, current_threadid, &curr) != ERROR_OK) {
LOG_ERROR("hwthread: cannot find thread id %"PRId64, current_threadid);
gdb_put_packet(connection, "E01", 3);
return ERROR_FAIL;
}
target->rtos->current_thread = current_threadid;
} else
if (current_threadid == 0 || current_threadid == -1)
target->rtos->current_thread = threadid_from_target(target);
target->rtos->current_threadid = current_threadid;
gdb_put_packet(connection, "OK", 2);
return ERROR_OK;
}
return rtos_thread_packet(connection, packet, packet_size);
}
static int hwthread_create(struct target *target)
{
LOG_INFO("Hardware thread awareness created");
target->rtos->rtos_specific_params = NULL;
target->rtos->current_thread = 0;
target->rtos->thread_details = NULL;
target->rtos->gdb_target_for_threadid = hwthread_target_for_threadid;
target->rtos->gdb_thread_packet = hwthread_thread_packet;
return 0;
}
static int hwthread_read_buffer(struct rtos *rtos, target_addr_t address,
uint32_t size, uint8_t *buffer)
{
if (!rtos)
return ERROR_FAIL;
struct target *target = rtos->target;
struct target *curr = hwthread_find_thread(target, rtos->current_thread);
if (!curr)
return ERROR_FAIL;
return target_read_buffer(curr, address, size, buffer);
}
static int hwthread_write_buffer(struct rtos *rtos, target_addr_t address,
uint32_t size, const uint8_t *buffer)
{
if (!rtos)
return ERROR_FAIL;
struct target *target = rtos->target;
struct target *curr = hwthread_find_thread(target, rtos->current_thread);
if (!curr)
return ERROR_FAIL;
return target_write_buffer(curr, address, size, buffer);
}
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