411 lines
18 KiB
Python
411 lines
18 KiB
Python
# This file is part of PeachPy package and is licensed under the Simplified BSD license.
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# See license.rst for the full text of the license.
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active_writers = []
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class TextWriter(object):
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def __init__(self, output_path):
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super(TextWriter, self).__init__()
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self.output_path = output_path
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self.prologue = []
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self.content = []
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self.epilogue = []
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def __enter__(self):
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global active_writers
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active_writers.append(self)
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self.output_file = open(self.output_path, "w")
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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global active_writers
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active_writers.remove(self)
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if exc_type is None:
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self.output_file.write(self.serialize())
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self.output_file.close()
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self.output_file = None
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else:
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import os
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os.unlink(self.output_file.name)
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self.output_file = None
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raise
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def serialize(self):
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import os
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prologue = self.prologue
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if not isinstance(prologue, str):
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prologue = os.linesep.join(map(str, prologue))
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if prologue:
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prologue += os.linesep * 3
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content = self.content
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if not isinstance(content, str):
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content = os.linesep.join(map(str, content))
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epilogue = self.epilogue
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if not isinstance(epilogue, str):
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epilogue = os.linesep.join(map(str, epilogue))
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if epilogue:
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epilogue = os.linesep * 3 + epilogue
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return prologue + content + epilogue
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class AssemblyWriter(TextWriter):
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def __init__(self, output_path, assembly_format, input_path=None):
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super(AssemblyWriter, self).__init__(output_path)
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if assembly_format not in {"go", "nasm", "masm", "gas"}:
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raise ValueError("Unknown assembly format: %s" % assembly_format)
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self.assembly_format = assembly_format
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self.comment_prefix = {
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"go": "//",
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"nasm": ";",
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"masm": ";",
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"gas": "#"
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}[assembly_format]
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if assembly_format == "go":
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from os import linesep
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self.prologue = "// +build !noasm" + linesep
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else:
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self.prologue = ""
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import peachpy
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if input_path is not None:
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self.prologue += "{escape} Generated by PeachPy {version} from {filename}".format(
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escape=self.comment_prefix, version=peachpy.__version__, filename=input_path)
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else:
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self.prologue += "{escape} Generated by PeachPy {version}".format(
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escape=self.comment_prefix, version=peachpy.__version__)
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self.prologue_lines = len(self.prologue.splitlines()) + 3
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def add_function(self, function):
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import peachpy.x86_64.function
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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function_lines = function.format(self.assembly_format, line_separator=None, line_number=self.prologue_lines + len(self.content))
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self.content += function_lines
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class ImageWriter(object):
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def __init__(self, output_path):
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super(ImageWriter, self).__init__()
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self.output_path = output_path
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def __enter__(self):
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global active_writers
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active_writers.append(self)
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self.output_file = open(self.output_path, "wb", buffering=0)
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return self
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def __exit__(self, exc_type, exc_value, traceback):
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global active_writers
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active_writers.remove(self)
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if exc_type is None:
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self.output_file.write(self.encode())
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self.output_file.close()
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self.output_file = None
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else:
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import os
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os.unlink(self.output_file.name)
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self.output_file = None
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raise
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def encode(self):
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return bytearray()
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class ELFWriter(ImageWriter):
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def __init__(self, output_path, abi, input_path=None):
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super(ELFWriter, self).__init__(output_path)
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from peachpy.formats.elf.image import Image
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from peachpy.formats.elf.section import TextSection, ProgramBitsSection
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self.abi = abi
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self.image = Image(abi, input_path)
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self.text_section = TextSection()
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self.image.add_section(self.text_section)
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self.gnu_stack_section = ProgramBitsSection(".note.GNU-stack", allocate=False)
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self.image.add_section(self.gnu_stack_section)
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self.text_rela_section = None
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self.rodata_section = None
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def encode(self):
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return self.image.as_bytearray
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def add_function(self, function):
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import peachpy.x86_64.function
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from peachpy.util import roundup
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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encoded_function = function.encode()
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code_offset = len(self.text_section.content)
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code_padding = bytearray([encoded_function.code_section.alignment_byte] *
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(roundup(code_offset, encoded_function.code_section.alignment) - code_offset))
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self.text_section.content += code_padding
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code_offset += len(code_padding)
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self.text_section.content += encoded_function.code_section.content
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self.text_section.alignment = max(self.text_section.alignment, encoded_function.code_section.alignment)
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const_offset = 0
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if encoded_function.const_section.content:
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if self.rodata_section is None:
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from peachpy.formats.elf.section import ReadOnlyDataSection
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self.rodata_section = ReadOnlyDataSection()
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self.image.add_section(self.rodata_section)
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const_offset = self.rodata_section.get_content_size(self.abi)
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const_padding = bytearray([encoded_function.const_section.alignment_byte] *
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(roundup(const_offset, encoded_function.const_section.alignment) - const_offset))
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self.rodata_section.content += const_padding
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const_offset += len(const_padding)
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self.rodata_section.content += encoded_function.const_section.content
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self.rodata_section.alignment = max(self.rodata_section.alignment, encoded_function.const_section.alignment)
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# Map from symbol name to symbol index
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from peachpy.formats.elf.symbol import Symbol, SymbolBinding, SymbolType
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symbol_map = dict()
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for symbol in encoded_function.const_section.symbols:
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const_symbol = Symbol()
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const_symbol.name = function.mangled_name + "." + symbol.name
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const_symbol.value = const_offset + symbol.offset
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const_symbol.size = symbol.size
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const_symbol.section = self.rodata_section
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const_symbol.binding = SymbolBinding.local
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const_symbol.type = SymbolType.data_object
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self.image.symtab.add(const_symbol)
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symbol_map[symbol] = const_symbol
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if encoded_function.code_section.relocations:
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if self.text_rela_section is None:
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from peachpy.formats.elf.section import RelocationsWithAddendSection
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self.text_rela_section = RelocationsWithAddendSection(self.text_section, self.image.symtab)
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self.image.add_section(self.text_rela_section)
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from peachpy.formats.elf.symbol import RelocationWithAddend, RelocationType
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for relocation in encoded_function.code_section.relocations:
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elf_relocation = RelocationWithAddend(RelocationType.x86_64_pc32,
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code_offset + relocation.offset,
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symbol_map[relocation.symbol],
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relocation.offset - relocation.program_counter)
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self.text_rela_section.add(elf_relocation)
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function_symbol = Symbol()
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function_symbol.name = function.mangled_name
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function_symbol.value = code_offset
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function_symbol.content_size = len(encoded_function.code_section)
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function_symbol.section = self.text_section
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function_symbol.binding = SymbolBinding.global_
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function_symbol.type = SymbolType.function
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self.image.symtab.add(function_symbol)
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class MachOWriter(ImageWriter):
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def __init__(self, output_path, abi):
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super(MachOWriter, self).__init__(output_path)
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from peachpy.formats.macho.image import Image
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self.abi = abi
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self.image = Image(abi)
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def encode(self):
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return self.image.encode()
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def add_function(self, function):
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import peachpy.x86_64.function
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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from peachpy.formats.macho.symbol import Symbol, SymbolType, SymbolDescription, SymbolVisibility, \
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Relocation, RelocationType
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from peachpy.util import roundup
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encoded_function = function.encode()
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code_offset = len(self.image.text_section.content)
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code_padding = bytearray([encoded_function.code_section.alignment_byte] *
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(roundup(code_offset, encoded_function.code_section.alignment) - code_offset))
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self.image.text_section.content += code_padding
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code_offset += len(code_padding)
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self.image.text_section.content += encoded_function.code_section.content
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self.image.text_section.alignment = \
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max(self.image.text_section.alignment, encoded_function.code_section.alignment)
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const_offset = self.image.const_section.content_size
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const_padding = bytearray([encoded_function.const_section.alignment_byte] *
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(roundup(const_offset, encoded_function.const_section.alignment) - const_offset))
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self.image.const_section.content += const_padding
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const_offset += len(const_padding)
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self.image.const_section.content += encoded_function.const_section.content
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self.image.const_section.alignment = \
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max(self.image.const_section.alignment, encoded_function.const_section.alignment)
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# Map from PeachPy symbol to Mach-O symbol
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symbol_map = dict()
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for symbol in encoded_function.const_section.symbols:
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macho_symbol = Symbol("_" + function.mangled_name + "." + symbol.name,
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SymbolType.section_relative, self.image.const_section,
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const_offset + symbol.offset)
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macho_symbol.description = SymbolDescription.defined
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self.image.symbol_table.add_symbol(macho_symbol)
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symbol_map[symbol] = macho_symbol
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for relocation in encoded_function.code_section.relocations:
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macho_relocation = Relocation(RelocationType.x86_64_signed, code_offset + relocation.offset, 4,
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symbol_map[relocation.symbol], is_pc_relative=True)
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relocation_addend = relocation.offset + 4 - relocation.program_counter
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if relocation_addend != 0:
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self.image.text_section.content[code_offset + relocation.offset] = relocation_addend & 0xFF
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self.image.text_section.content[code_offset + relocation.offset + 1] = (relocation_addend >> 8) & 0xFF
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self.image.text_section.content[code_offset + relocation.offset + 2] = (relocation_addend >> 16) & 0xFF
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self.image.text_section.content[code_offset + relocation.offset + 3] = (relocation_addend >> 24) & 0xFF
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self.image.text_section.relocations.append(macho_relocation)
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function_symbol = Symbol("_" + function.mangled_name, SymbolType.section_relative, self.image.text_section,
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value=code_offset)
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function_symbol.description = SymbolDescription.defined
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function_symbol.visibility = SymbolVisibility.external
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self.image.symbol_table.add_symbol(function_symbol)
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class MSCOFFWriter(ImageWriter):
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def __init__(self, output_path, abi, input_path=None):
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super(MSCOFFWriter, self).__init__(output_path)
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from peachpy.formats.mscoff import Image, TextSection, ReadOnlyDataSection
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self.output_path = output_path
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self.abi = abi
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self.image = Image(abi, input_path)
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self.text_section = TextSection()
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self.image.add_section(self.text_section)
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self.rdata_section = ReadOnlyDataSection()
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self.image.add_section(self.rdata_section)
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def encode(self):
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return self.image.encode()
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def add_function(self, function):
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import peachpy.x86_64.function
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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from peachpy.util import roundup
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from peachpy.formats.mscoff import Symbol, SymbolType, StorageClass, Relocation, RelocationType
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encoded_function = function.encode()
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code_offset = len(self.text_section.content)
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code_padding = bytearray([encoded_function.code_section.alignment_byte] *
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(roundup(code_offset, encoded_function.code_section.alignment) - code_offset))
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self.text_section.content += code_padding
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code_offset += len(code_padding)
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self.text_section.content += encoded_function.code_section.content
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self.text_section.alignment = \
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max(self.text_section.alignment, encoded_function.code_section.alignment)
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rdata_offset = self.rdata_section.content_size
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rdata_padding = bytearray([encoded_function.const_section.alignment_byte] *
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(roundup(rdata_offset, encoded_function.const_section.alignment) - rdata_offset))
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self.rdata_section.content += rdata_padding
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rdata_offset += len(rdata_padding)
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self.rdata_section.content += encoded_function.const_section.content
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self.rdata_section.alignment = \
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max(self.rdata_section.alignment, encoded_function.const_section.alignment)
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# Map from PeachPy symbol to Mach-O symbol
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symbol_map = dict()
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for symbol in encoded_function.const_section.symbols:
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mscoff_symbol = Symbol()
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mscoff_symbol.name = symbol.name
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mscoff_symbol.value = rdata_offset + symbol.offset
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mscoff_symbol.section = self.rdata_section
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mscoff_symbol.symbol_type = SymbolType.non_function
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mscoff_symbol.storage_class = StorageClass.static
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self.image.add_symbol(mscoff_symbol)
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symbol_map[symbol] = mscoff_symbol
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for relocation in encoded_function.code_section.relocations:
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relocation_type_map = {
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4: RelocationType.x86_64_relocation_offset32,
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5: RelocationType.x86_64_relocation_plus_1_offset32,
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6: RelocationType.x86_64_relocation_plus_2_offset32,
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7: RelocationType.x86_64_relocation_plus_3_offset32,
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8: RelocationType.x86_64_relocation_plus_4_offset32,
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9: RelocationType.x86_64_relocation_plus_5_offset32
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}
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relocation_type = relocation_type_map[relocation.program_counter - relocation.offset]
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mscoff_relocation = Relocation(relocation_type,
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code_offset + relocation.offset,
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symbol_map[relocation.symbol])
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self.text_section.relocations.append(mscoff_relocation)
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function_symbol = Symbol()
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function_symbol.name = function.mangled_name
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function_symbol.value = code_offset
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function_symbol.section = self.text_section
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function_symbol.symbol_type = SymbolType.function
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function_symbol.storage_class = StorageClass.external
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self.image.add_symbol(function_symbol)
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class MetadataWriter(TextWriter):
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def __init__(self, output_path):
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super(MetadataWriter, self).__init__(output_path)
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self.metadata = []
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def add_function(self, function):
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import peachpy.x86_64.function
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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self.metadata.append(function.metadata)
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class JSONMetadataWriter(MetadataWriter):
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def __init__(self, output_path):
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super(JSONMetadataWriter, self).__init__(output_path)
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def serialize(self):
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import json
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return json.dumps(self.metadata)
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class CHeaderWriter(TextWriter):
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def __init__(self, output_path, input_path=None):
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super(CHeaderWriter, self).__init__(output_path)
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import peachpy
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if input_path is not None:
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self.prologue = ["/* Generated by PeachPy %s from %s */" % (peachpy.__version__, input_path)]
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else:
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self.prologue = ["/* Generated by PeachPy %s */" % peachpy.__version__]
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self.prologue += [
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"",
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"#pragma once",
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"",
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"#ifdef __cplusplus",
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"extern \"C\" {",
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"#endif"
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]
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self.epilogue = [
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"#ifdef __cplusplus",
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"} /* extern \"C\" */",
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"#endif",
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""
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]
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def add_function(self, function):
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import peachpy.x86_64.function
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assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
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"Function must be finalized with an ABI before its assembly can be used"
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return_type = "void" if function.result_type is None else str(function.result_type)
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arguments = [str(arg.c_type) + " " + arg.name for arg in function.arguments]
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self.content.append(return_type + " " + function.mangled_name + "(" + ", ".join(arguments) + ");")
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