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Added _ADD_ABS_LO12_NC relocation for ARM; fixed addend for R_386_PC32 and R_386_32; fixed get_return_function_type and strip_function to work with stencils that do the passing on call not at the end

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Nicolas 2025-11-14 00:51:42 +01:00 committed by Nicolas Kruse
parent 0f464d74a5
commit ab589449a3
1 changed files with 21 additions and 8 deletions
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29
src/copapy/_stencils.py
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@ -63,15 +63,16 @@ def detect_process_arch() -> str:
def get_return_function_type(symbol: elf_symbol) -> str:
if symbol.relocations:
result_func = symbol.relocations[-1].symbol
if result_func.name.startswith('result_'):
return result_func.name[7:]
for reloc in reversed(symbol.relocations):
func_name = reloc.symbol.name
if func_name.startswith('result_'):
return func_name[7:]
return 'void'
def strip_function(func: elf_symbol) -> bytes:
"""Return stencil code by striped stancil function"""
assert func.relocations and func.relocations[-1].symbol.info == 'STT_NOTYPE', f"{func.name} is not a stencil function"
assert func.relocations and any(reloc.symbol.name.startswith('result_') for reloc in func.relocations), f"{func.name} is not a stencil function"
start_index, end_index = get_stencil_position(func)
return func.data[start_index:end_index]
@ -206,6 +207,8 @@ class stencil_database():
scale = 1
mask = 0xFFFFFFFF # 32 bit
#print("------- reloc ", pr.type, pr.target_section.name, pr.symbol.name)
if pr.type.endswith('64_PC32') or pr.type.endswith('64_PLT32'):
# S + A - P
patch_value = symbol_address + pr.fields['r_addend'] - patch_offset
@ -213,12 +216,12 @@ class stencil_database():
elif pr.type == 'R_386_PC32':
# S + A - P
patch_value = symbol_address + pr.fields['r_addend'] - patch_offset - 4
#print(f" *> {pr.type} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {pr.bits=}, {function_offset=} {patch_offset=}")
patch_value = symbol_address + pr.fields['r_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=}")
elif pr.type == 'R_386_32':
# R_386_32
# (S + A)
# S + A
patch_value = symbol_address + pr.fields['r_addend']
symbol_type = symbol_type + 0x03 # Relative to data section
#print(f" *> {pr.type} {patch_value=} {symbol_address=} {pr.fields['r_addend']=} {pr.bits=}, {function_offset=} {patch_offset=}")
@ -232,7 +235,6 @@ class stencil_database():
scale = 4
elif pr.type.endswith('_ADR_PREL_PG_HI21'):
# R_AARCH64_LDST32_ABS_LO12_NC
# R_AARCH64_ADR_PREL_PG_HI21
assert pr.file.byteorder == 'little', "Big endian not supported for ARM64"
mask = 0 # Handled by runner
@ -250,6 +252,15 @@ class stencil_database():
scale = 4
#print(f" *> {patch_value=} {symbol_address=} {pr.fields['r_addend']=}, {function_offset=}")
elif pr.type.endswith('_ADD_ABS_LO12_NC'):
# R_AARCH64_ADD_ABS_LO12_NC
# (S + A) & 0xFFF
mask = 0b11_1111_1111_1100_0000_0000
patch_value = symbol_address + pr.fields['r_addend']
symbol_type = symbol_type + 0x02 # Absolut value
scale = 1
#print(f" *> {patch_value=} {symbol_address=} {pr.fields['r_addend']=}, {function_offset=}")
elif pr.type.endswith('_LDST64_ABS_LO12_NC'):
# R_AARCH64_LDST64_ABS_LO12_NC
# (S + A) & 0xFFF
@ -288,10 +299,12 @@ class stencil_database():
for name in names:
#print('- get_sub_functions: ', name)
if name not in name_set:
#print('||||', name)
# assert name in self.elf.symbols, f"Stencil {name} not found" <-- see: https://github.com/Nonannet/pelfy/issues/1
func = self.elf.symbols[name]
for r in func.relocations:
if r.symbol.info == 'STT_FUNC':
#print(' ', r.symbol.name, r.symbol.section.type)
name_set.add(r.symbol.name)
name_set |= self.get_sub_functions([r.symbol.name])
return name_set