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Debug: Add PyCortexDebug. Core and peripheral register database and decoder. (#251)

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* Debug: pycortexdebug
* Debug: format PyCortexMDebug source code
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2020-11-19 18:48:34 +03:00
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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PyCortexMDebug
==============
*A set of GDB/Python-based utilities to make life debugging ARM Cortex-M processors a bit easier*
It will consist of several modules which will hopefully become integrated as they evolve. Presently, there is only one:
## SVD
ARM defines an SVD (System View Description) file format in its CMSIS
standard as a means for Cortex-M-based chip manufacturers to provide a
common description of peripherals, registers, and register fields. You
can download SVD files for different manufacturers
[here](http://www.arm.com/products/processors/cortex-m/cortex-microcontroller-software-interface-standard.php).
My implementation so far has only tested STM32 chips but should hold for others. If others are like those from ST,
expect plenty of errors in the file. Like GPIOA having a register named GPIOB_OSPEEDR and lots of 16-bit registers
that are listed as 32!
The implementation consists of two components -- An lxml-based parser module (pysvd) and a GDB file (gdb_svd).
I haven't yet worked out a perfect workflow for this, though it's quite easy to use when
you already tend to have a GDB initialization file for starting up OpenOCD and the like.
However your workflow works, just make sure to, in GDB:
source gdb_svd.py
svd_load [your_svd_file].svd
These files can be huge so it might take a second or two. Anyways, after that, you can do
svd
to list available peripherals with descriptions. Or you can do
svd [some_peripheral_name]
to see all of the registers (with their values) for a given peripheral. For more details, run
svd [some_peripheral_name] [some_register_name]
to see all of the field values with descriptions.
You can add format modifiers like:
* `svd/x` will display values in hex
* `svd/o` will display values in octal
* `svd/t` or `svd/b` will display values in binary
* `svd/a` will display values in hex and try to resolve symbols from the values
All field values are displayed at the correct lengths as provided by the SVD files.
Also, tab completion exists for nearly everything! When in doubt, run `svd help`.
### TODO
Enable writing to registers and individual fields
### Bugs
There are probably a few. All planning, writing, and testing of this was done in an afternoon. There may be
some oddities in working with non-STM32 parts. I'll play with this when I start working with other
controllers again. If something's giving you trouble, describe the problem and it shall be fixed.
## DWT
The ARM Data Watchpoint and Trace Unit (DWT) offers data watchpoints and a series of gated cycle counters. For now,
I only support the raw cycle counter but facilities are in place to make use of others. As this is independent of the
specific device under test, commands are simple and you can configure a clock speed to get real time values from
counters.
dwt configclk 48000000
will set the current core clock speed. Then
dwt cyccnt reset
dwt cyccnt enable
will reset and start the cycle counter. At any point
dwt cycnt
will then indicate the number of cycles and amount of time that has passed.
## ITM/ETM support
This is not implemented yet. I want to have more complete support for some of the nicer debug and trace features
on Cortex-M processors. Parts of this will probably be dependent on OpenOCD and possibly on specific interfaces.
I'll try to avoid this where possible but can't make any promises.

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#!/usr/bin/env python
"""
This file is part of PyCortexMDebug
PyCortexMDebug is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PyCortexMDebug is distributed in the hope that 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 PyCortexMDebug. If not, see <http://www.gnu.org/licenses/>.
"""
import gdb
import struct
DWT_CTRL = 0xE0001000
DWT_CYCCNT = 0xE0001004
DWT_CPICNT = 0xE0001008
DWT_EXTCNT = 0xE000100C
DWT_SLEEPCNT = 0xE0001010
DWT_LSUCNT = 0xE0001014
DWT_FOLDCNT = 0xE0001018
DWT_PCSR = 0xE000101C
prefix = "dwt : "
class DWT(gdb.Command):
clk = None
is_init = False
def __init__(self):
gdb.Command.__init__(self, "dwt", gdb.COMMAND_DATA)
def read(self, address, bits=32):
"""Read from memory (using print) and return an integer"""
value = gdb.selected_inferior().read_memory(address, bits / 8)
return struct.unpack_from("<i", value)[0]
def write(self, address, value, bits=32):
"""Set a value in memory"""
gdb.selected_inferior().write_memory(address, bytes(value), bits / 8)
def invoke(self, args, from_tty):
if not self.is_init:
self.write(0xE000EDFC, self.read(0xE000EDFC) | (1 << 24))
self.write(DWT_CTRL, 0)
self.is_init = True
s = map(lambda x: x.lower(), str(args).split(" "))
# Check for empty command
if s[0] in ["", "help"]:
self.print_help()
return ()
if s[0] == "cyccnt":
if len(s) > 1:
if s[1][:2] == "en":
self.cyccnt_en()
elif s[1][0] == "r":
self.cyccnt_reset()
elif s[1][0] == "d":
self.cyccnt_dis()
gdb.write(
prefix
+ "CYCCNT ({}): ".format("ON" if (self.read(DWT_CTRL) & 1) else "OFF")
+ self.cycles_str(self.read(DWT_CYCCNT))
)
elif s[0] == "reset":
if len(s) > 1:
if s[1] == "cyccnt":
self.cyccnt_reset()
gdb.write(prefix + "CYCCNT reset\n")
if s[1] == "counters":
self.cyccnt_reset()
gdb.write(prefix + "CYCCNT reset\n")
else:
self.cyccnt_reset()
gdb.write(prefix + "CYCCNT reset\n")
else:
# Reset everything
self.cyccnt_reset()
gdb.write(prefix + "CYCCNT reset\n")
elif s[0] == "configclk":
if len(s) == 2:
try:
self.clk = float(s[1])
except:
self.print_help()
else:
self.print_help()
else:
# Try to figure out what stupid went on here
gdb.write(args)
self.print_help()
def complete(self, text, word):
text = str(text).lower()
s = text.split(" ")
commands = ["configclk", "reset", "cyccnt"]
reset_commands = ["counters", "cyccnt"]
cyccnt_commands = ["enable", "reset", "disable"]
if len(s) == 1:
return filter(lambda x: x.startswith(s[0]), commands)
if len(s) == 2:
if s[0] == "reset":
return filter(lambda x: x.startswith(s[1]), reset_commands)
if s[0] == "cyccnt":
return filter(lambda x: x.startswith(s[1]), cyccnt_commands)
def cycles_str(self, cycles):
if self.clk:
return "%d cycles, %.3es\n" % (cycles, cycles * 1.0 / self.clk)
else:
return "%d cycles"
def cyccnt_en(self):
self.write(DWT_CTRL, self.read(DWT_CTRL) | 1)
def cyccnt_dis(self):
self.write(DWT_CTRL, self.read(DWT_CTRL) & 0xFFFFFFFE)
def cyccnt_reset(self, value=0):
self.write(DWT_CYCCNT, value)
def cpicnt_reset(self, value=0):
self.write(DWT_CPICNT, value & 0xFF)
def print_help(self):
gdb.write("Usage:\n")
gdb.write("=========\n")
gdb.write("dwt:\n")
gdb.write("\tList available peripherals\n")
gdb.write("dwt configclk [Hz]:\n")
gdb.write("\tSet clock for rendering time values in seconds\n")
gdb.write("dwt reset:\n")
gdb.write("\tReset everything in DWT\n")
gdb.write("dwt reset counters:\n")
gdb.write("\tReset all DWT counters\n")
gdb.write("dwt cyccnt\n")
gdb.write("\tDisplay the cycle count\n")
gdb.write("\td(default):decimal, x: hex, o: octal, b: binary\n")
return ()

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

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#!/usr/bin/env python
"""
This file is part of PyCortexMDebug
PyCortexMDebug is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PyCortexMDebug is distributed in the hope that 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 PyCortexMDebug. If not, see <http://www.gnu.org/licenses/>.
"""
import binascii
import gdb
import re
import math
import sys
import struct
import pkg_resources
sys.path.append(".")
from cmdebug.svd import SVDFile
# from svd_test import *
BITS_TO_UNPACK_FORMAT = {
8: "B",
16: "H",
32: "I",
}
class LoadSVD(gdb.Command):
"""A command to load an SVD file and to create the command for inspecting
that object
"""
def __init__(self):
self.vendors = {}
try:
vendor_names = pkg_resources.resource_listdir("cmsis_svd", "data")
for vendor in vendor_names:
fnames = pkg_resources.resource_listdir(
"cmsis_svd", "data/{}".format(vendor)
)
self.vendors[vendor] = [
fname for fname in fnames if fname.lower().endswith(".svd")
]
except:
pass
if len(self.vendors) > 0:
gdb.Command.__init__(self, "svd_load", gdb.COMMAND_USER)
else:
gdb.Command.__init__(
self, "svd_load", gdb.COMMAND_DATA, gdb.COMPLETE_FILENAME
)
def complete(self, text, word):
args = gdb.string_to_argv(text)
num_args = len(args)
if text.endswith(" "):
num_args += 1
if not text:
num_args = 1
# "svd_load <tab>" or "svd_load ST<tab>"
if num_args == 1:
prefix = word.lower()
return [
vendor for vendor in self.vendors if vendor.lower().startswith(prefix)
]
# "svd_load STMicro<tab>" or "svd_load STMicro STM32F1<tab>"
elif num_args == 2 and args[0] in self.vendors:
prefix = word.lower()
filenames = self.vendors[args[0]]
return [fname for fname in filenames if fname.lower().startswith(prefix)]
return gdb.COMPLETE_NONE
def invoke(self, args, from_tty):
args = gdb.string_to_argv(args)
argc = len(args)
if argc == 1:
gdb.write("Loading SVD file {}...\n".format(args[0]))
f = args[0]
elif argc == 2:
gdb.write("Loading SVD file {}/{}...\n".format(args[0], args[1]))
f = pkg_resources.resource_filename(
"cmsis_svd", "data/{}/{}".format(args[0], args[1])
)
else:
raise gdb.GdbError(
"Usage: svd_load <vendor> <device.svd> or svd_load <path/to/filename.svd>\n"
)
try:
SVD(SVDFile(f))
except Exception as e:
raise gdb.GdbError("Could not load SVD file {} : {}...\n".format(f, e))
if __name__ == "__main__":
# This will also get executed by GDB
# Create just the svd_load command
LoadSVD()
class SVD(gdb.Command):
"""The CMSIS SVD (System View Description) inspector command
This allows easy access to all peripheral registers supported by the system
in the GDB debug environment
"""
def __init__(self, svd_file):
gdb.Command.__init__(self, "svd", gdb.COMMAND_DATA)
self.svd_file = svd_file
def _print_registers(self, container_name, form, registers):
if len(registers) == 0:
return
try:
regs_iter = registers.itervalues()
except AttributeError:
regs_iter = registers.values()
gdb.write("Registers in %s:\n" % container_name)
regList = []
for r in regs_iter:
if r.readable():
data = self.read(r.address(), r.size)
data = self.format(data, form, r.size)
if form == "a":
data += (
" <"
+ re.sub(
r"\s+",
" ",
gdb.execute(
"info symbol {}".format(data), True, True
).strip(),
)
+ ">"
)
else:
data = "(not readable)"
desc = re.sub(r"\s+", " ", r.description)
regList.append((r.name, data, desc))
column1Width = max(len(reg[0]) for reg in regList) + 2 # padding
column2Width = max(len(reg[1]) for reg in regList)
for reg in regList:
gdb.write(
"\t{}:{}{}".format(
reg[0],
"".ljust(column1Width - len(reg[0])),
reg[1].rjust(column2Width),
)
)
if reg[2] != reg[0]:
gdb.write(" {}".format(reg[2]))
gdb.write("\n")
def _print_register_fields(self, container_name, form, register):
gdb.write("Fields in {}:\n".format(container_name))
fields = register.fields
if not register.readable():
data = 0
else:
data = self.read(register.address(), register.size)
fieldList = []
try:
fields_iter = fields.itervalues()
except AttributeError:
fields_iter = fields.values()
for f in fields_iter:
desc = re.sub(r"\s+", " ", f.description)
if register.readable():
val = data >> f.offset
val &= (1 << f.width) - 1
if f.enum:
if val in f.enum:
desc = f.enum[val][1] + " - " + desc
val = f.enum[val][0]
else:
val = "Invalid enum value: " + self.format(val, form, f.width)
else:
val = self.format(val, form, f.width)
else:
val = "(not readable)"
fieldList.append((f.name, val, desc))
column1Width = max(len(field[0]) for field in fieldList) + 2 # padding
column2Width = max(len(field[1]) for field in fieldList) # padding
for field in fieldList:
gdb.write(
"\t{}:{}{}".format(
field[0],
"".ljust(column1Width - len(field[0])),
field[1].rjust(column2Width),
)
)
if field[2] != field[0]:
gdb.write(" {}".format(field[2]))
gdb.write("\n")
def invoke(self, args, from_tty):
s = str(args).split(" ")
form = ""
if s[0] and s[0][0] == "/":
if len(s[0]) == 1:
gdb.write("Incorrect format\n")
return
else:
form = s[0][1:]
if len(s) == 1:
return
s = s[1:]
if s[0].lower() == "help":
gdb.write("Usage:\n")
gdb.write("=========\n")
gdb.write("svd:\n")
gdb.write("\tList available peripherals\n")
gdb.write("svd [peripheral_name]:\n")
gdb.write("\tDisplay all registers pertaining to that peripheral\n")
gdb.write("svd [peripheral_name] [register_name]:\n")
gdb.write("\tDisplay the fields in that register\n")
gdb.write("svd/[format_character] ...\n")
gdb.write("\tFormat values using that character\n")
gdb.write("\td(default):decimal, x: hex, o: octal, b: binary\n")
return
if not len(s[0]):
gdb.write("Available Peripherals:\n")
try:
peripherals = self.svd_file.peripherals.itervalues()
except AttributeError:
peripherals = self.svd_file.peripherals.values()
columnWidth = max(len(p.name) for p in peripherals) + 2 # padding
try:
peripherals = self.svd_file.peripherals.itervalues()
except AttributeError:
peripherals = self.svd_file.peripherals.values()
for p in peripherals:
desc = re.sub(r"\s+", " ", p.description)
gdb.write(
"\t{}:{}{}\n".format(
p.name, "".ljust(columnWidth - len(p.name)), desc
)
)
return
registers = None
if len(s) >= 1:
peripheral_name = s[0]
if peripheral_name not in self.svd_file.peripherals:
gdb.write("Peripheral {} does not exist!\n".format(s[0]))
return
peripheral = self.svd_file.peripherals[peripheral_name]
if len(s) == 1:
self._print_registers(s[0], form, peripheral.registers)
if len(peripheral.clusters) > 0:
try:
clusters_iter = peripheral.clusters.itervalues()
except AttributeError:
clusters_iter = peripheral.clusters.values()
gdb.write("Clusters in %s:\n" % peripheral_name)
regList = []
for r in clusters_iter:
desc = re.sub(r"\s+", " ", r.description)
regList.append((r.name, "", desc))
column1Width = max(len(reg[0]) for reg in regList) + 2 # padding
column2Width = max(len(reg[1]) for reg in regList)
for reg in regList:
gdb.write(
"\t{}:{}{}".format(
reg[0],
"".ljust(column1Width - len(reg[0])),
reg[1].rjust(column2Width),
)
)
if reg[2] != reg[0]:
gdb.write(" {}".format(reg[2]))
gdb.write("\n")
return
cluster = None
if len(s) == 2:
container = " ".join(s[:2])
if s[1] in peripheral.clusters:
self._print_registers(
container, form, peripheral.clusters[s[1]].registers
)
elif s[1] in peripheral.registers:
self._print_register_fields(
container, form, self.svd_file.peripherals[s[0]].registers[s[1]]
)
else:
gdb.write(
"Register/cluster {} in peripheral {} does not exist!\n".format(
s[1], s[0]
)
)
return
if len(s) == 3:
if s[1] not in peripheral.clusters:
gdb.write(
"Cluster {} in peripheral {} does not exist!\n".format(s[1], s[0])
)
elif s[2] not in peripheral.clusters[s[1]].registers:
gdb.write(
"Register {} in cluster {} in peripheral {} does not exist!\n".format(
s[2], s[1], s[0]
)
)
else:
container = " ".join(s[:3])
cluster = peripheral.clusters[s[1]]
self._print_register_fields(container, form, cluster.registers[s[2]])
return
if len(s) == 4:
try:
reg = self.svd_file.peripherals[s[0]].registers[s[1]]
except KeyError:
gdb.write(
"Register {} in peripheral {} does not exist!\n".format(s[1], s[0])
)
return
try:
field = reg.fields[s[2]]
except KeyError:
gdb.write(
"Field {} in register {} in peripheral {} does not exist!\n".format(
s[2], s[1], s[0]
)
)
return
if not field.writable() or not reg.writable():
gdb.write(
"Field {} in register {} in peripheral {} is read-only!\n".format(
s[2], s[1], s[0]
)
)
return
try:
val = int(s[3], 0)
except ValueError:
gdb.write(
"{} is not a valid number! You can prefix numbers with 0x for hex, 0b for binary, or any python int literal\n".format(
s[3]
)
)
return
if val >= 1 << field.width or val < 0:
gdb.write(
"{} not a valid number for a field with width {}!\n".format(
val, field.width
)
)
return
if not reg.readable():
data = 0
else:
data = self.read(reg.address(), reg.size)
data &= ~(((1 << field.width) - 1) << field.offset)
data |= (val) << field.offset
self.write(reg.address(), data, reg.size)
return
gdb.write("Unknown input\n")
def complete(self, text, word):
"""Perform tab-completion for the command"""
text = str(text)
s = text.split(" ")
# Deal with the possibility of a '/' parameter
if s[0] and s[0][0] == "/":
if len(s) > 1:
s = s[1:]
else:
return
if len(s) == 1:
return filter(
lambda x: x.lower().startswith(s[0].lower()),
self.peripheral_list() + ["help"],
)
if len(s) == 2:
reg = s[1].upper()
if len(reg) and reg[0] == "&":
reg = reg[1:]
filt = filter(lambda x: x.startswith(reg), self.register_list(s[0].upper()))
return filt
def read(self, address, bits=32):
"""Read from memory and return an integer"""
value = gdb.selected_inferior().read_memory(address, bits / 8)
unpack_format = "I"
if bits in BITS_TO_UNPACK_FORMAT:
unpack_format = BITS_TO_UNPACK_FORMAT[bits]
# gdb.write("{:x} {}\n".format(address, binascii.hexlify(value)))
return struct.unpack_from("<" + unpack_format, value)[0]
def write(self, address, data, bits=32):
"""Write data to memory"""
gdb.selected_inferior().write_memory(address, bytes(data), bits / 8)
def format(self, value, form, length=32):
"""Format a number based on a format character and length"""
# get current gdb radix setting
radix = int(
re.search("\d+", gdb.execute("show output-radix", True, True)).group(0)
)
# override it if asked to
if form == "x" or form == "a":
radix = 16
elif form == "o":
radix = 8
elif form == "b" or form == "t":
radix = 2
# format the output
if radix == 16:
# For addresses, probably best in hex too
l = int(math.ceil(length / 4.0))
return "0x" + "{:X}".format(value).zfill(l)
if radix == 8:
l = int(math.ceil(length / 3.0))
return "0" + "{:o}".format(value).zfill(l)
if radix == 2:
return "0b" + "{:b}".format(value).zfill(length)
# Default: Just return in decimal
return str(value)
def peripheral_list(self):
try:
keys = self.svd_file.peripherals.iterkeys()
except AttributeError:
keys = elf.svd_file.peripherals.keys()
return list(keys)
def register_list(self, peripheral):
try:
try:
keys = self.svd_file.peripherals[peripheral].registers.iterkeys()
except AttributeError:
keys = self.svd_file.peripherals[peripheral].registers.keys()
return list(keys)
except:
gdb.write("Peripheral {} doesn't exist\n".format(peripheral))
return []
def field_list(self, peripheral, register):
try:
periph = svd_file.peripherals[peripheral]
reg = periph.registers[register]
try:
regs = reg.fields.iterkeys()
except AttributeError:
regs = reg.fields.keys()
return list(regs)
except:
gdb.write("Register {} doesn't exist on {}\n".format(register, peripheral))
return []

26
debug/PyCortexMDebug/scripts/gdb.py Normal file
View File

@@ -0,0 +1,26 @@
""" Simple script to load from GDB to import all components
===============================================================================
This file is part of PyCortexMDebug
PyCortexMDebug is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
PyCortexMDebug is distributed in the hope that 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 PyCortexMDebug. If not, see <http://www.gnu.org/licenses/>.
"""
from cmdebug.svd_gdb import LoadSVD
from cmdebug.dwt_gdb import DWT
DWT()
LoadSVD()