def add_function(self, function):
import peachpy.x86_64.function
from peachpy.util import roundup
assert isinstance(function, peachpy.x86_64.function.ABIFunction), \
"Function must be finalized with an ABI before its assembly can be used"
encoded_function = function.encode()
code_offset = len(self.text_section.content)
code_padding = bytearray([encoded_function.code_section.alignment_byte] *
(roundup(code_offset, encoded_function.code_section.alignment) - code_offset))
self.text_section.content += code_padding
code_offset += len(code_padding)
self.text_section.content += encoded_function.code_section.content
self.text_section.alignment = max(self.text_section.alignment, encoded_function.code_section.alignment)
const_offset = 0
if encoded_function.const_section.content:
if self.rodata_section is None:
from peachpy.formats.elf.section import ReadOnlyDataSection
self.rodata_section = ReadOnlyDataSection()
self.image.add_section(self.rodata_section)
const_offset = self.rodata_section.get_content_size(self.abi)
const_padding = bytearray([encoded_function.const_section.alignment_byte] *
(roundup(const_offset, encoded_function.const_section.alignment) - const_offset))
self.rodata_section.content += const_padding
const_offset += len(const_padding)
self.rodata_section.content += encoded_function.const_section.content
self.rodata_section.alignment = max(self.rodata_section.alignment, encoded_function.const_section.alignment)
# Map from symbol name to symbol index
from peachpy.formats.elf.symbol import Symbol, SymbolBinding, SymbolType
symbol_map = dict()
for symbol in encoded_function.const_section.symbols:
const_symbol = Symbol()
const_symbol.name = function.mangled_name + "." + symbol.name
const_symbol.value = const_offset + symbol.offset
const_symbol.size = symbol.size
const_symbol.section = self.rodata_section
const_symbol.binding = SymbolBinding.local
const_symbol.type = SymbolType.data_object
self.image.symtab.add(const_symbol)
symbol_map[symbol] = const_symbol
if encoded_function.code_section.relocations:
if self.text_rela_section is None:
from peachpy.formats.elf.section import RelocationsWithAddendSection
self.text_rela_section = RelocationsWithAddendSection(self.text_section, self.image.symtab)
self.image.add_section(self.text_rela_section)
from peachpy.formats.elf.symbol import RelocationWithAddend, RelocationType
for relocation in encoded_function.code_section.relocations:
elf_relocation = RelocationWithAddend(RelocationType.x86_64_pc32,
code_offset + relocation.offset,
symbol_map[relocation.symbol],
relocation.offset - relocation.program_counter)
self.text_rela_section.add(elf_relocation)
function_symbol = Symbol()
function_symbol.name = function.mangled_name
function_symbol.value = code_offset
function_symbol.content_size = len(encoded_function.code_section)
function_symbol.section = self.text_section
function_symbol.binding = SymbolBinding.global_
function_symbol.type = SymbolType.function
self.image.symtab.add(function_symbol)
