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// Copyright 2021 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#define PW_LOG_LEVEL PW_THREAD_FREERTOS_CONFIG_LOG_LEVEL
#include "pw_thread_freertos/snapshot.h"
#include <string_view>
#include "FreeRTOS.h"
#include "pw_function/function.h"
#include "pw_log/log.h"
#include "pw_protobuf/encoder.h"
#include "pw_span/span.h"
#include "pw_status/status.h"
#include "pw_thread/snapshot.h"
#include "pw_thread_freertos/config.h"
#include "pw_thread_freertos/freertos_tsktcb.h"
#include "pw_thread_freertos/util.h"
#include "pw_thread_protos/thread.pwpb.h"
#include "task.h"
namespace pw::thread::freertos {
namespace {
// The externed function is an internal FreeRTOS kernel function from
// FreeRTOS/Source/tasks.c needed in order to calculate a thread's stack usage
// from interrupts which the native APIs do not permit.
#if ((configUSE_TRACE_FACILITY == 1) || \
(INCLUDE_uxTaskGetStackHighWaterMark == 1))
extern "C" uint16_t prvTaskCheckFreeStackSpace(const uint8_t* pucStackByte);
#endif // ((configUSE_TRACE_FACILITY == 1) ||
// (INCLUDE_uxTaskGetStackHighWaterMark == 1))
void CaptureThreadState(eTaskState thread_state,
proto::pwpb::Thread::StreamEncoder& encoder) {
switch (thread_state) {
case eRunning:
PW_LOG_DEBUG("Thread state: RUNNING");
encoder.WriteState(proto::pwpb::ThreadState::Enum::RUNNING).IgnoreError();
return;
case eReady:
PW_LOG_DEBUG("Thread state: READY");
encoder.WriteState(proto::pwpb::ThreadState::Enum::READY).IgnoreError();
return;
case eBlocked:
PW_LOG_DEBUG("Thread state: BLOCKED");
encoder.WriteState(proto::pwpb::ThreadState::Enum::BLOCKED).IgnoreError();
return;
case eSuspended:
PW_LOG_DEBUG("Thread state: SUSPENDED");
encoder.WriteState(proto::pwpb::ThreadState::Enum::SUSPENDED)
.IgnoreError();
return;
case eDeleted:
PW_LOG_DEBUG("Thread state: INACTIVE");
encoder.WriteState(proto::pwpb::ThreadState::Enum::INACTIVE)
.IgnoreError();
return;
case eInvalid:
default:
PW_LOG_DEBUG("Thread state: UNKNOWN");
encoder.WriteState(proto::pwpb::ThreadState::Enum::UNKNOWN).IgnoreError();
return;
}
}
} // namespace
Status SnapshotThreads(void* running_thread_stack_pointer,
proto::pwpb::SnapshotThreadInfo::StreamEncoder& encoder,
ProcessThreadStackCallback& stack_dumper) {
struct {
void* running_thread_stack_pointer;
proto::pwpb::SnapshotThreadInfo::StreamEncoder* encoder;
ProcessThreadStackCallback* stack_dumper;
Status thread_capture_status;
} ctx;
ctx.running_thread_stack_pointer = running_thread_stack_pointer;
ctx.encoder = &encoder;
ctx.stack_dumper = &stack_dumper;
ctx.thread_capture_status = OkStatus();
ThreadCallback thread_capture_cb(
[&ctx](TaskHandle_t thread, eTaskState thread_state) -> bool {
proto::pwpb::Thread::StreamEncoder thread_encoder =
ctx.encoder->GetThreadsEncoder();
ctx.thread_capture_status.Update(
SnapshotThread(thread,
thread_state,
ctx.running_thread_stack_pointer,
thread_encoder,
*ctx.stack_dumper));
return true; // Iterate through all threads.
});
if (const Status status = ForEachThread(thread_capture_cb);
!status.ok() && !status.IsFailedPrecondition()) {
PW_LOG_ERROR("Failed to iterate threads during snapshot capture: %d",
status.code());
}
return ctx.thread_capture_status;
}
Status SnapshotThread(
TaskHandle_t thread,
eTaskState thread_state,
void* running_thread_stack_pointer,
proto::pwpb::Thread::StreamEncoder& encoder,
[[maybe_unused]] ProcessThreadStackCallback& thread_stack_callback) {
const tskTCB& tcb = *reinterpret_cast<tskTCB*>(thread);
PW_LOG_DEBUG("Capturing thread info for %s", tcb.pcTaskName);
PW_TRY(encoder.WriteName(as_bytes(span(std::string_view(tcb.pcTaskName)))));
CaptureThreadState(thread_state, encoder);
// TODO: b/234890430 - Update this once we add support for ascending stacks.
static_assert(portSTACK_GROWTH < 0, "Ascending stacks are not yet supported");
// If the thread is active, the stack pointer in the TCB is stale.
const uintptr_t stack_pointer = reinterpret_cast<uintptr_t>(
thread_state == eRunning ? running_thread_stack_pointer
: tcb.pxTopOfStack);
const uintptr_t stack_low_addr = reinterpret_cast<uintptr_t>(tcb.pxStack);
#if ((portSTACK_GROWTH > 0) || (configRECORD_STACK_HIGH_ADDRESS == 1))
const uintptr_t stack_high_addr =
reinterpret_cast<uintptr_t>(tcb.pxEndOfStack);
const StackContext thread_ctx = {
.thread_name = tcb.pcTaskName,
.stack_low_addr = stack_low_addr,
.stack_high_addr = stack_high_addr,
.stack_pointer = stack_pointer,
#if ((configUSE_TRACE_FACILITY == 1) || \
(INCLUDE_uxTaskGetStackHighWaterMark == 1))
#if (portSTACK_GROWTH > 0)
.stack_pointer_est_peak =
stack_high_addr -
(sizeof(StackType_t) *
prvTaskCheckFreeStackSpace(
reinterpret_cast<const uint8_t*>(stack_high_addr))),
#else
.stack_pointer_est_peak =
stack_low_addr +
(sizeof(StackType_t) *
prvTaskCheckFreeStackSpace(
reinterpret_cast<const uint8_t*>(stack_low_addr))),
#endif // (portSTACK_GROWTH > 0)
#else
.stack_pointer_est_peak = std::nullopt,
#endif // ((configUSE_TRACE_FACILITY == 1) ||
// (INCLUDE_uxTaskGetStackHighWaterMark == 1))
};
return SnapshotStack(thread_ctx, encoder, thread_stack_callback);
#else
encoder.WriteStackEndPointer(stack_low_addr);
encoder.WriteStackPointer(stack_pointer);
return encoder.status();
#endif // ((portSTACK_GROWTH > 0) || (configRECORD_STACK_HIGH_ADDRESS == 1))
}
} // namespace pw::thread::freertos