def compile_function(code,
compiler_flags="-fPIE",
bits=32,
little_endian=False,
entry=0x0,
symbols=None):
with utils.tempdir() as td:
c_fname = os.path.join(td, "code.c")
object_fname = os.path.join(td, "code.o")
object2_fname = os.path.join(td, "code.2.o")
linker_script_fname = os.path.join(td, "code.lds")
with open(c_fname, 'w') as fp:
fp.write(code)
linker_script = "SECTIONS { .text : { *(.text) "
if symbols:
for i in symbols:
linker_script += i + " = " + hex(symbols[i] - entry) + ";"
linker_script += "}}"
with open(linker_script_fname, 'w') as fp:
fp.write(linker_script)
target = ("mipsel-linux-gnu" if little_endian else
"mips-linux-gnu") if bits == 32 else (
"mips64el-linux-gnuabi64"
if little_endian else "mips64-linux-gnuabi64")
res = utils.exec_cmd("clang -target %s -o %s -c %s %s" \
% (target, object_fname, c_fname, compiler_flags), shell=True)
if res[2] != 0:
raise CLangException("CLang error: " +
str(res[0] + res[1], 'utf-8'))
res = utils.exec_cmd(
"ld.lld -relocatable %s -T %s -o %s" %
(object_fname, linker_script_fname, object2_fname),
shell=True)
if res[2] != 0:
raise Exception("Linking Error: " +
str(res[0] + res[1], 'utf-8'))
ld = cle.Loader(object2_fname, main_opts={"base_addr": 0x0})
compiled = ld.memory.load(ld.all_objects[0].entry,
0xFFFFFFFFFFFFFFFF)
return compiled
def compile_function(code,
compiler_flags="",
is_thumb=False,
entry=0x0,
symbols=None):
with utils.tempdir() as td:
c_fname = os.path.join(td, "code.c")
object_fname = os.path.join(td, "code.o")
object2_fname = os.path.join(td, "code.2.o")
linker_script_fname = os.path.join(td, "code.lds")
with open(c_fname, 'w') as fp:
fp.write(code)
linker_script = "SECTIONS { .text : { *(.text) "
if symbols:
for i in symbols:
linker_script += i + " = " + hex(symbols[i] - entry) + ";"
linker_script += "}}"
with open(linker_script_fname, 'w') as fp:
fp.write(linker_script)
res = utils.exec_cmd("clang -target arm-none-eabi -Os -mcpu=cortex-m0 -o %s -c %s %s %s" \
% (object_fname, c_fname, compiler_flags, "-mthumb" if is_thumb else "-mno-thumb"), shell=True)
if res[2] != 0:
raise CLangException("CLang error: " +
str(res[0] + res[1], 'utf-8'))
res = utils.exec_cmd(
"ld.lld -relocatable %s -T %s -o %s" %
(object_fname, linker_script_fname, object2_fname),
shell=True)
if res[2] != 0:
raise Exception("Linking Error: " +
str(res[0] + res[1], 'utf-8'))
ld = cle.Loader(object2_fname, main_opts={"base_addr": 0x0})
compiled = ld.memory.load(ld.all_objects[0].entry,
0xFFFFFFFFFFFFFFFF)
return compiled
def compile_function(code,
compiler_flags="",
bits=32,
little_endian=False,
entry=0x0,
symbols=None,
data_only=False,
prefix=""):
with utils.tempdir() as td:
c_fname = os.path.join(td, "code.c")
object_fname = os.path.join(td, "code.o")
object2_fname = os.path.join(td, "code.2.o")
linker_script_fname = os.path.join(td, "code.lds")
data_fname = os.path.join(td, "data")
rodata_sec_index = rodata_sym_index_old = rodata_sym_index_new = -1
# C -> Object File
with open(c_fname, 'w') as fp:
fp.write(code)
target = ("powerpcle-linux-gnu" if little_endian else
"powerpc-linux-gnu") if bits == 32 else (
"powerpc64le-linux-gnu"
if little_endian else "powerpc64-linux-gnu")
res = utils.exec_cmd("clang -target %s -o %s -c %s %s" \
% (target, object_fname, c_fname, compiler_flags), shell=True)
if res[2] != 0:
raise CLangException("CLang error: " +
str(res[0] + res[1], 'utf-8'))
# Setup Linker Script
linker_script = "SECTIONS { .text : { *(.text) "
if symbols:
for i in symbols:
if i == ".rodata":
linker_script += i + " = " + hex(symbols[i] - (
(entry - 0x10700000) & ~0xFFFF)) + ";"
else:
linker_script += i + " = " + hex(symbols[i] -
entry) + ";"
linker_script += "} .rodata : { *(.rodata*) } }"
with open(linker_script_fname, 'w') as fp:
fp.write(linker_script)
# Object File --LinkerScript--> Object File
res = utils.exec_cmd(
"ld.lld -relocatable %s -T %s -o %s" %
(object_fname, linker_script_fname, object2_fname),
shell=True)
if res[2] != 0:
raise Exception("Linking Error: " +
str(res[0] + res[1], 'utf-8'))
# Load Object File
ld = cle.Loader(object2_fname,
main_opts={"base_addr": 0x0},
perform_relocations=False)
# Figure Out .text Section Size
for section in ld.all_objects[0].sections:
if section.name == ".text":
text_section_size = section.filesize
break
# Modify Symbols in Object File to Trick Loader
with open(object2_fname, "rb+") as f:
elf = ELFFile(f)
# Find the Index of .rodata Section
for i in range(elf.num_sections()):
if elf.get_section(i).name == ".rodata":
rodata_sec_index = i
break
# Find the Index of the src and dest Symbol
symtab_section = elf.get_section_by_name(".symtab")
for i in range(symtab_section.num_symbols()):
if symtab_section.get_symbol(
i
)['st_shndx'] == rodata_sec_index and symtab_section.get_symbol(
i)['st_info']['type'] == 'STT_SECTION':
rodata_sym_index_old = i
if symtab_section.get_symbol(i).name == ".rodata":
rodata_sym_index_new = i
# Rewrite the Symbol
if rodata_sym_index_new != -1 and rodata_sec_index != -1 and rodata_sym_index_old != -1:
for i in range(elf.num_sections()):
if elf.get_section(i).header[
'sh_name'] == symtab_section.header['sh_name']:
f.seek(0)
content = f.read()
f.seek(symtab_section['sh_offset'] +
rodata_sym_index_new *
symtab_section['sh_entsize'])
rodata_sym_new = f.read(
symtab_section['sh_entsize'])
content = utils.bytes_overwrite(
content, rodata_sym_new,
symtab_section['sh_offset'] +
rodata_sym_index_old *
symtab_section['sh_entsize'])
f.seek(0)
f.write(content)
f.truncate()
break
# Replace all R_PPC_PLTREL24 to R_PPC_REL24
rela_section = elf.get_section_by_name(".rela.text")
if rela_section is not None:
for i in range(rela_section.num_relocations()):
if rela_section.get_relocation(i)['r_info_type'] == 18:
reloc = rela_section.get_relocation(i).entry
reloc['r_info'] -= 8
for j in range(elf.num_sections()):
if elf.get_section(j).header[
'sh_name'] == rela_section.header[
'sh_name']:
f.seek(0)
content = f.read()
content = utils.bytes_overwrite(
content,
elf.structs.Elf_Rela.build(reloc),
rela_section['sh_offset'] +
i * rela_section['sh_entsize'])
f.seek(0)
f.write(content)
f.truncate()
break
# Load the Modified Object File and Return compiled Data or Code
ld = cle.Loader(object2_fname,
main_opts={
"base_addr": 0x0,
"entry_point": 0x0
})
if data_only:
patches = []
for section in ld.all_objects[0].sections:
if section.name == ".rodata":
res = utils.exec_cmd(
"objcopy -B i386 -O binary -j %s %s %s" %
(section.name, object2_fname, data_fname),
shell=True)
if res[2] != 0:
raise ObjcopyException("Objcopy Error: " +
str(res[0] +
res[1], 'utf-8'))
with open(data_fname, "rb") as fp:
patches.append(
AddRODataPatch(fp.read(),
name=prefix + section.name))
break
return patches
else:
compiled = ld.memory.load(ld.all_objects[0].entry,
text_section_size)
return compiled
def compile_function(self,
code,
compiler_flags="",
is_thumb=False,
entry=0x0,
symbols=None):
with utils.tempdir() as td:
c_fname = os.path.join(td, "code.c")
object_fname = os.path.join(td, "code.o")
object2_fname = os.path.join(td, "code.2.o")
linker_script_fname = os.path.join(td, "code.lds")
with open(c_fname, 'w') as fp:
fp.write(code)
linker_script = "SECTIONS { .text : SUBALIGN(0) { . = " + hex(
entry) + "; *(.text) "
if symbols:
for i in symbols:
linker_script += i + " = " + hex(symbols[i]) + ";"
linker_script += "}}"
with open(linker_script_fname, 'w') as fp:
fp.write(linker_script)
res = utils.exec_cmd("clang -target arm-linux-gnueabihf -o %s -c %s %s %s" \
% (object_fname, c_fname, compiler_flags, "-mthumb" if is_thumb else "-mno-thumb"), shell=True)
if res[2] != 0:
raise CLangException("CLang error: " +
str(res[0] + res[1], 'utf-8'))
res = utils.exec_cmd(
"ld.lld -relocatable %s -T %s -o %s" %
(object_fname, linker_script_fname, object2_fname),
shell=True)
if res[2] != 0:
raise Exception("Linking Error: " +
str(res[0] + res[1], 'utf-8'))
ld = cle.Loader(object2_fname, main_opts={"base_addr": 0x0})
compiled = ld.memory.load(ld.all_objects[0].entry + entry,
ld.memory.max_addr)
disasm = self.disassemble(compiled, entry, is_thumb=is_thumb)
disasm_str = ""
for instr in disasm:
if is_thumb and instr.mnemonic == "bl" and instr.operands[
0].imm in symbols.values():
disasm_str += self.capstone_to_asm(instr).replace(
"bl", "blx") + "\n"
elif is_thumb and instr.mnemonic == "blx" and (
instr.operands[0].imm + 1) in symbols.values():
disasm_str += self.capstone_to_asm(instr).replace(
"blx", "bl") + "\n"
elif not is_thumb and instr.mnemonic == "bl" and (
instr.operands[0].imm + 1) in symbols.values():
disasm_str += self.capstone_to_asm(instr).replace(
"bl", "blx") + "\n"
elif not is_thumb and instr.mnemonic == "blx" and instr.operands[
0].imm in symbols.values():
disasm_str += self.capstone_to_asm(instr).replace(
"blx", "bl") + "\n"
else:
disasm_str += self.capstone_to_asm(instr) + "\n"
compiled = self.compile_asm(disasm_str,
base=entry,
name_map={},
is_thumb=is_thumb)
return compiled
def compile_function(self,
code,
compiler_flags="",
bits=32,
entry=0x0,
symbols=None,
stacklayout=None):
import json
with utils.tempdir() as td:
c_fname = os.path.join(td, "code.c")
ll_fname = os.path.join(td, "code.ll")
ll2_fname = os.path.join(td, "code.2.ll")
json_fname = os.path.join(td, "code.json")
object_fname = os.path.join(td, "code.o")
object2_fname = os.path.join(td, "code.2.o")
linker_script_fname = os.path.join(td, "code.lds")
if stacklayout is None:
clang = "clang-11"
opt = "opt-11"
llc = "llc-11"
lld = "ld.lld-11"
else:
clang = "/precompiled_llvm_bins/clang"
opt = "/precompiled_llvm_bins/opt"
llc = "/precompiled_llvm_bins/llc"
lld = "/precompiled_llvm_bins/ld.lld"
with open(c_fname, 'w') as fp:
fp.write(code)
linker_script = "SECTIONS { .text : SUBALIGN(0) { . = " + hex(
entry) + "; *(.text) "
if symbols is not None:
for i in symbols:
linker_script += i + " = " + hex(symbols[i]) + ";"
linker_script += "}}"
print(linker_script)
with open(linker_script_fname, 'w') as fp:
fp.write(linker_script)
# c -> ll
res = utils.exec_cmd(
"%s -S -emit-llvm -g -o %s %s %s %s" %
(clang, ll_fname, "-m32" if bits == 32 else "-m64", c_fname,
compiler_flags),
shell=True)
if res[2] != 0:
raise Exception("Clang Error: " +
str(res[0] + res[1], 'utf-8'))
# ll --force-dso-local-> ll
res = utils.exec_cmd(
"%s -load /precompiled_llvm_bins/LLVMAMP.so --force-dso-local -S %s -o %s"
% (opt, ll_fname, ll_fname),
shell=True)
if res[2] != 0:
raise Exception("opt Error: " + str(res[0] + res[1], 'utf-8'))
res = utils.exec_cmd("%s -Os -S %s -o %s" %
(opt, ll_fname, ll_fname),
shell=True)
if res[2] != 0:
raise Exception("opt Error: " + str(res[0] + res[1], 'utf-8'))
# # ll -> ll + AMPDebug
if stacklayout is not None:
self.addAMPDebug(ll_fname, ll2_fname, stacklayout)
else:
ll2_fname = ll_fname
# ll + AMPDebug -> obj
res = utils.exec_cmd(
"%s -o %s %s -relocation-model=pic --x86-asm-syntax=intel --filetype=obj"
% (llc, object_fname, ll2_fname),
shell=True)
if res[2] != 0:
raise CLangException("llc error: " +
str(res[0] + res[1], 'utf-8'))
print(str(res[1], 'utf-8')) # TODO: remove this
# relocate
res = utils.exec_cmd(
"%s -relocatable %s -T %s -o %s" %
(lld, object_fname, linker_script_fname, object2_fname),
shell=True)
if res[2] != 0:
raise Exception("Linking Error: " +
str(res[0] + res[1], 'utf-8'))
print(str(res[1], 'utf-8'))
ld = cle.Loader(object2_fname, main_opts={"base_addr": 0x0})
compiled = ld.memory.load(ld.all_objects[0].entry + entry,
ld.memory.max_addr)
return compiled