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57 lines
1.9 KiB
57 lines
1.9 KiB
4 months ago
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2018 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Architecture-specific information."""
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import collections
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import json
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class Arch(
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collections.namedtuple('Arch', [
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'arch_nr', 'arch_name', 'bits', 'syscalls', 'constants',
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'syscall_groups'
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])):
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"""Holds architecture-specific information."""
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def truncate_word(self, value):
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"""Return the value truncated to fit in a word."""
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return value & self.max_unsigned
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@property
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def min_signed(self):
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"""The smallest signed value that can be represented in a word."""
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return -(1 << (self.bits - 1))
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@property
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def max_unsigned(self):
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"""The largest unsigned value that can be represented in a word."""
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return (1 << self.bits) - 1
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@staticmethod
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def load_from_json(json_path):
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"""Return an Arch from a .json file."""
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with open(json_path, 'r') as json_file:
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constants = json.load(json_file)
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return Arch(
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arch_nr=constants['arch_nr'],
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arch_name=constants['arch_name'],
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bits=constants['bits'],
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syscalls=constants['syscalls'],
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constants=constants['constants'],
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syscall_groups=constants.get('syscall_groups', {}),
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)
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