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#
# SPDX-FileCopyrightText: Copyright 2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
#
# SPDX-License-Identifier: Apache-2.0
#
# 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
#
# 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.
#
from .elf import *
from .types import *
import json
import mmap
import os
from sys import stderr
class InputInterface:
def readEventRecord(self) -> EventRecord_t:
...
class InputFile(InputInterface):
def __init__(self, fname):
self.file = open(fname, 'rb')
def readEventRecord(self):
data = self.file.read(EventRecord_t.SIZE)
if len(data) == 0:
raise EOFError
yield data
class InputRingBuffer(InputInterface):
def __init__(self, elfFile):
from elftools.elf.elffile import ELFFile
with open(elfFile, 'rb') as f:
elf = ELFFile(f)
symbol = elfFindSymbol(elf, 'EventRecorderInfo')
elfInfo = EventRecorderInfo_t(elfGetData(elf, symbol.entry.st_value, symbol.entry.st_size))
memInfo = EventRecorderInfo_t(self.read(symbol.entry.st_value, symbol.entry.st_size))
# Validate EventRecorder info
if elfInfo.protocolType != memInfo.protocolType or \
elfInfo.protocolVersion != memInfo.protocolVersion or \
elfInfo.eventBuffer != memInfo.eventBuffer or \
elfInfo.eventStatus != memInfo.eventStatus:
raise Exception(f'EventRecorder info mismatch. elf={elfInfo}, mem={memInfo}')
self.info = elfInfo
status = EventStatus_t(self.read(self.info.eventStatus, EventStatus_t.SIZE))
self.timestamp = status.tsLast
self.recordIndex = status.recordIndex
self.overflow = 0
def readEventRecord(self):
# Read status and use timestamp to detect if there are new samples
status = EventStatus_t(self.read(self.info.eventStatus, EventStatus_t.SIZE))
if self.timestamp == status.tsLast:
return None
self.timestamp = status.tsLast
# Detect firmware reset
if self.recordIndex > status.recordIndex:
self.recordIndex = 0
# Detect of recordIndex has overflowed the ring buffer
if status.recordIndex - self.recordIndex > self.info.recordCount:
stderr.write('Warning: Ring buffer overflow\n')
self.overflow = self.overflow + 1
self.recordIndex = status.recordIndex
# Generate data for each event record
for i in range(self.recordIndex, status.recordIndex):
i = i % self.info.recordCount
yield self.read(self.info.eventBuffer + EventRecord_t.SIZE * i, EventRecord_t.SIZE)
self.recordIndex = status.recordIndex
def read(self, address, size) -> bytearray:
...
class InputDAPLink(InputRingBuffer):
def __init__(self, elfFile):
self._open()
super().__init__(elfFile)
self.target.reset()
def _open(self):
from pyocd.core.helpers import ConnectHelper
self.session = ConnectHelper.session_with_chosen_probe()
self.board = self.session.board
self.target = self.board.target
self.session.open()
def read(self, address, size):
from pyocd.core.exceptions import Error
for i in range(1000):
try:
return bytearray(self.target.read_memory_block8(address, size))
except Error:
pass
class InputMem(InputRingBuffer):
def __init__(self, elfFile, jsonFile):
with open(jsonFile, 'r') as f:
jsonDoc = json.loads(f.read())
self.memoryMap = []
for memoryMap in jsonDoc['memoryMap']:
host = int(memoryMap['host'], 16)
device = int(memoryMap['device'], 16)
size = int(memoryMap['size'], 16)
self.memoryMap.append(DevMemDevice(host, device, size))
super().__init__(elfFile)
def read(self, device, size):
for memoryMap in self.memoryMap:
data = memoryMap.read(device, size)
if data:
return data
stderr.write(f'Warning: No mapping found for device address {hex(device)} size {size}.\n')
return None
class DevMem:
def __init__(self, address, size):
self.base_address = address & ~(mmap.PAGESIZE - 1)
self.offset = address - self.base_address
self.size = size + self.offset
self.fd = os.open('/dev/mem', os.O_RDWR | os.O_SYNC)
self.mem = mmap.mmap(self.fd, self.size, mmap.MAP_SHARED, mmap.PROT_READ,
offset=self.base_address)
def __del__(self):
os.close(self.fd)
def read(self, offset, size):
self.mem.seek(self.offset + offset)
data = bytearray(size)
for i in range(size):
data[i] = self.mem.read_byte()
return data
class DevMemDevice(DevMem):
def __init__(self, host, device, size):
super().__init__(host, size)
self.device = device
self.size = size
def read(self, device, size):
offset = device - self.device
if offset < 0 or (offset + size) > self.size:
return None
return super().read(offset, size)
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