Debug: Add PyCortexDebug. Core and peripheral register database and decoder. (#251)
* Debug: pycortexdebug * Debug: format PyCortexMDebug source code
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debug/PyCortexMDebug/cmdebug/svd.py
Executable file
288
debug/PyCortexMDebug/cmdebug/svd.py
Executable file
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"""
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This file is part of PyCortexMDebug
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PyCortexMDebug is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PyCortexMDebug is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with PyCortexMDebug. If not, see <http://www.gnu.org/licenses/>.
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"""
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import lxml.objectify as objectify
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import sys
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from copy import deepcopy
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from collections import OrderedDict
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import os
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import traceback
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class SVDNonFatalError(Exception):
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"""Exception class for non-fatal errors
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So far, these have related to quirks in some vendor SVD files which are reasonable to ignore
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"""
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def __init__(self, m):
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self.m = m
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self.exc_info = sys.exc_info()
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def __str__(self):
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s = "Non-fatal: {}".format(self.m)
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s += "\n" + str("".join(traceback.format_exc())).strip()
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return s
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class SVDFile:
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def __init__(self, fname):
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f = objectify.parse(os.path.expanduser(fname))
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root = f.getroot()
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periph = root.peripherals.getchildren()
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self.peripherals = OrderedDict()
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# XML elements
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for p in periph:
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try:
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self.peripherals[str(p.name)] = SVDPeripheral(p, self)
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except SVDNonFatalError as e:
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print(e)
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def add_register(parent, node):
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if hasattr(node, "dim"):
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dim = int(str(node.dim), 0)
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# dimension is not used, number of split indexes should be same
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incr = int(str(node.dimIncrement), 0)
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default_dim_index = ",".join((str(i) for i in range(dim)))
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dim_index = str(getattr(node, "dimIndex", default_dim_index))
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indexes = dim_index.split(",")
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offset = 0
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for i in indexes:
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name = str(node.name) % i
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reg = SVDPeripheralRegister(node, parent)
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reg.name = name
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reg.offset += offset
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parent.registers[name] = reg
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offset += incr
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else:
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try:
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parent.registers[str(node.name)] = SVDPeripheralRegister(node, parent)
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except:
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pass
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def add_cluster(parent, node):
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if hasattr(node, "dim"):
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dim = int(str(node.dim), 0)
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# dimension is not used, number of split indexes should be same
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incr = int(str(node.dimIncrement), 0)
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default_dim_index = ",".join((str(i) for i in range(dim)))
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dim_index = str(getattr(node, "dimIndex", default_dim_index))
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indexes = dim_index.split(",")
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offset = 0
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for i in indexes:
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name = str(node.name) % i
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cluster = SVDRegisterCluster(node, parent)
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cluster.name = name
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cluster.address_offset += offset
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cluster.base_address += offset
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parent.clusters[name] = cluster
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offset += incr
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else:
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try:
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parent.clusters[str(node.name)] = SVDRegisterCluster(node, parent)
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except SVDNonFatalError as e:
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print(e)
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class SVDRegisterCluster:
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def __init__(self, svd_elem, parent):
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self.parent = parent
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self.address_offset = int(str(svd_elem.addressOffset), 0)
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self.base_address = self.address_offset + parent.base_address
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# This doesn't inherit registers from anything
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children = svd_elem.getchildren()
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self.description = str(svd_elem.description)
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self.name = str(svd_elem.name)
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self.registers = OrderedDict()
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self.clusters = OrderedDict()
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for r in children:
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if r.tag == "register":
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add_register(self, r)
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def refactor_parent(self, parent):
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self.parent = parent
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self.base_address = parent.base_address + self.address_offset
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try:
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values = self.registers.itervalues()
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except AttributeError:
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values = self.registers.values()
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for r in values:
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r.refactor_parent(self)
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def __unicode__(self):
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return str(self.name)
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class SVDPeripheral:
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def __init__(self, svd_elem, parent):
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self.parent = parent
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if not hasattr(svd_elem, "baseAddress"):
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raise SVDNonFatalError("Periph without base address")
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self.base_address = int(str(svd_elem.baseAddress), 0)
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if "derivedFrom" in svd_elem.attrib:
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derived_from = svd_elem.attrib["derivedFrom"]
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try:
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self.name = str(svd_elem.name)
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except:
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self.name = parent.peripherals[derived_from].name
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try:
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self.description = str(svd_elem.description)
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except:
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self.description = parent.peripherals[derived_from].description
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self.registers = deepcopy(parent.peripherals[derived_from].registers)
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self.clusters = deepcopy(parent.peripherals[derived_from].clusters)
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self.refactor_parent(parent)
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else:
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# This doesn't inherit registers from anything
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registers = svd_elem.registers.getchildren()
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self.description = str(svd_elem.description)
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self.name = str(svd_elem.name)
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self.registers = OrderedDict()
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self.clusters = OrderedDict()
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for r in registers:
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if r.tag == "cluster":
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add_cluster(self, r)
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else:
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add_register(self, r)
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def refactor_parent(self, parent):
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self.parent = parent
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try:
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values = self.registers.itervalues()
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except AttributeError:
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values = self.registers.values()
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for r in values:
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r.refactor_parent(self)
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try:
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for c in self.clusters.itervalues():
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c.refactor_parent(self)
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except AttributeError:
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for c in self.clusters.values():
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c.refactor_parent(self)
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def __unicode__(self):
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return str(self.name)
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class SVDPeripheralRegister:
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def __init__(self, svd_elem, parent):
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self.parent = parent
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self.name = str(svd_elem.name)
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self.description = str(svd_elem.description)
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self.offset = int(str(svd_elem.addressOffset), 0)
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try:
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self.access = str(svd_elem.access)
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except:
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self.access = "read-write"
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try:
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self.size = int(str(svd_elem.size), 0)
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except:
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self.size = 0x20
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self.fields = OrderedDict()
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if hasattr(svd_elem, "fields"):
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fields = svd_elem.fields.getchildren()
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for f in fields:
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self.fields[str(f.name)] = SVDPeripheralRegisterField(f, self)
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def refactor_parent(self, parent):
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self.parent = parent
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try:
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fields = self.fields.itervalues()
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except AttributeError:
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fields = self.fields.values()
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for f in fields:
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f.refactor_parent(self)
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def address(self):
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return self.parent.base_address + self.offset
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def readable(self):
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return self.access in ["read-only", "read-write", "read-writeOnce"]
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def writable(self):
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return self.access in [
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"write-only",
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"read-write",
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"writeOnce",
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"read-writeOnce",
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]
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def __unicode__(self):
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return str(self.name)
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class SVDPeripheralRegisterField:
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def __init__(self, svd_elem, parent):
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self.parent = parent
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self.name = str(svd_elem.name)
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self.description = str(getattr(svd_elem, "description", ""))
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try:
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self.offset = int(str(svd_elem.bitOffset))
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self.width = int(str(svd_elem.bitWidth))
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except:
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try:
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bitrange = list(
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map(int, str(svd_elem.bitRange).strip()[1:-1].split(":"))
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)
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self.offset = bitrange[1]
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self.width = 1 + bitrange[0] - bitrange[1]
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except:
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lsb = int(str(svd_elem.lsb))
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msb = int(str(svd_elem.msb))
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self.offset = lsb
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self.width = 1 + msb - lsb
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self.access = str(getattr(svd_elem, "access", parent.access))
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self.enum = {}
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if hasattr(svd_elem, "enumeratedValues"):
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for v in svd_elem.enumeratedValues.getchildren():
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if v.tag == "name":
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continue
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# Some Kinetis parts have values with # instead of 0x...
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value = str(v.value).replace("#", "0x")
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self.enum[int(value, 0)] = (str(v.name), str(v.description))
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def refactor_parent(self, parent):
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self.parent = parent
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def readable(self):
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return self.access in ["read-only", "read-write", "read-writeOnce"]
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def writable(self):
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return self.access in [
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"write-only",
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"read-write",
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"writeOnce",
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"read-writeOnce",
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]
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def __unicode__(self):
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return str(self.name)
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if __name__ == "__main__":
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for f in sys.argv[1:]:
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print("Testing file: {}".format(f))
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svd = SVDFile(f)
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print(svd.peripherals)
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key = list(svd.peripherals)[0]
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print("Registers in peripheral '{}':".format(key))
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print(svd.peripherals[key].registers)
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print("Done testing file: {}".format(f))
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