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