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added add_sign_int32 function, since pelfy returns addend-values for 32 bit x86 as unsigned int32

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Nicolas 2026-03-03 13:05:47 +01:00
parent a924d42e6a
commit 7a3088ec48
1 changed files with 10 additions and 2 deletions
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12
src/copapy/_stencils.py
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@ -135,6 +135,11 @@ def get_op_after_last_call_in_function(func: pelfy.elf_symbol) -> int:
return reloc.fields['r_offset'] - func.offset_in_section + 4 return reloc.fields['r_offset'] - func.offset_in_section + 4
def add_sign_int32(value: int) -> int:
"""Convert a 32-bit unsigned integer to a signed integer."""
return value - 0x100000000 if value > 0x7FFFFFFF else value
class stencil_database(): class stencil_database():
"""A class for loading and querying a stencil database from an ELF object file """A class for loading and querying a stencil database from an ELF object file
@ -226,6 +231,7 @@ class stencil_database():
cache.append(reloc_entry) cache.append(reloc_entry)
yield reloc_entry yield reloc_entry
def get_patch(self, relocation: relocation_entry, symbol_address: int, function_offset: int, symbol_type: int) -> patch_entry: def get_patch(self, relocation: relocation_entry, symbol_address: int, function_offset: int, symbol_type: int) -> patch_entry:
"""Return patch positions for a provided symbol (function or object) """Return patch positions for a provided symbol (function or object)
@ -251,12 +257,14 @@ class stencil_database():
if pr.type.endswith('64_PC32') or pr.type.endswith('64_PLT32'): if pr.type.endswith('64_PC32') or pr.type.endswith('64_PLT32'):
# S + A - P # S + A - P
patch_value = symbol_address + pr.fields['r_addend'] - patch_offset addend = add_sign_int32(pr.fields['r_addend'])
patch_value = symbol_address + addend - patch_offset
#print(f" *> {pr.type} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {pr.bits=}, {function_offset=} {patch_offset=}") #print(f" *> {pr.type} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {pr.bits=}, {function_offset=} {patch_offset=}")
elif pr.type == 'R_386_PC32': elif pr.type == 'R_386_PC32':
# S + A - P # S + A - P
patch_value = symbol_address + pr.fields['r_addend'] - patch_offset addend = add_sign_int32(pr.fields['r_addend'])
patch_value = symbol_address + addend - patch_offset
#print(f" *> {pr.type} {pr.symbol.name} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {bin(pr.fields['r_addend'])} {pr.bits=}, {function_offset=} {patch_offset=}") #print(f" *> {pr.type} {pr.symbol.name} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {bin(pr.fields['r_addend'])} {pr.bits=}, {function_offset=} {patch_offset=}")
elif pr.type == 'R_386_32': elif pr.type == 'R_386_32':