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59 lines
1.5 KiB
59 lines
1.5 KiB
4 months ago
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"""Abstraction layer for different ABIs."""
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import re
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import symbol
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def UnpackLittleEndian(word):
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"""Split a hexadecimal string in little endian order."""
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return [word[x:x+2] for x in range(len(word) - 2, -2, -2)]
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ASSEMBLE = 'as'
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DISASSEMBLE = 'objdump'
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LINK = 'ld'
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UNPACK = 'unpack'
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OPTIONS = {
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'x86': {
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ASSEMBLE: ['--32'],
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LINK: ['-melf_i386']
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}
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}
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class Architecture(object):
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"""Creates an architecture abstraction for a given ABI.
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Args:
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name: The abi name, as represented in a tombstone.
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"""
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def __init__(self, name):
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symbol.ARCH = name
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self.toolchain = symbol.FindToolchain()
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self.options = OPTIONS.get(name, {})
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def Assemble(self, args):
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"""Generates an assembler command, appending the given args."""
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return [symbol.ToolPath(ASSEMBLE)] + self.options.get(ASSEMBLE, []) + args
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def Link(self, args):
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"""Generates a link command, appending the given args."""
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return [symbol.ToolPath(LINK)] + self.options.get(LINK, []) + args
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def Disassemble(self, args):
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"""Generates a disassemble command, appending the given args."""
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return ([symbol.ToolPath(DISASSEMBLE)] + self.options.get(DISASSEMBLE, []) +
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args)
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def WordToBytes(self, word):
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"""Unpacks a hexadecimal string in the architecture's byte order.
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Args:
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word: A string representing a hexadecimal value.
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Returns:
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An array of hexadecimal byte values.
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"""
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return self.options.get(UNPACK, UnpackLittleEndian)(word)
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