def initialize(state):
'''
Synchronize the stack and register state (manticore->qemu)
'''
logger.debug("Copying {} bytes in the stack..".format(stack_top -
state.cpu.SP))
stack_bottom = min(state.cpu.SP, gdb.getR('SP'))
for address in range(stack_bottom, stack_top):
b = state.cpu.read_int(address, 8)
gdb.setByte(address, chr(b))
logger.debug("Done")
# Qemu fd's start at 5, ours at 3. Add two filler fds
mcore_stdout = state.platform.files[1]
state.platform.files.append(mcore_stdout)
state.platform.files.append(mcore_stdout)
# Sync gdb's regs
for gdb_reg in gdb.getCanonicalRegisters():
if gdb_reg.endswith('psr'):
mcore_reg = 'APSR'
else:
mcore_reg = gdb_reg.upper()
value = state.cpu.read_register(mcore_reg)
gdb.setR(gdb_reg, value)
def initialize(state):
'''
Synchronize the stack and register state (manticore->qemu)
'''
logger.debug("Copying {} bytes in the stack..".format(stack_top - state.cpu.SP))
stack_bottom = min(state.cpu.SP, gdb.getR('SP'))
for address in range(stack_bottom, stack_top):
b = state.cpu.read_int(address, 8)
gdb.setByte(address, chr(b))
logger.debug("Done")
# Qemu fd's start at 5, ours at 3. Add two filler fds
mcore_stdout = state.platform.files[1]
state.platform.files.append(mcore_stdout)
state.platform.files.append(mcore_stdout)
# Sync gdb's regs
for gdb_reg in gdb.getCanonicalRegisters():
if gdb_reg.endswith('psr'):
mcore_reg = 'APSR'
else:
mcore_reg = gdb_reg.upper()
value = state.cpu.read_register(mcore_reg)
gdb.setR(gdb_reg, value)
def post_mcore(state, last_instruction):
'''
Handle syscalls (import memory) and bail if we diverge
'''
global in_helper
# Synchronize qemu state to manticore's after a system call
if last_instruction.mnemonic.lower() == 'svc':
# Synchronize all writes that have happened
writes = state.cpu.memory.pop_record_writes()
if writes:
logger.debug("Got %d writes", len(writes))
for addr, val in writes:
gdb.setByte(addr, val[0])
# Write return val to gdb
gdb_r0 = gdb.getR('R0')
if gdb_r0 != state.cpu.R0:
logger.debug(
f"Writing 0x{state.cpu.R0:x} to R0 (overwriting 0x{gdb.getR('R0'):x})"
)
for reg in state.cpu.canonical_registers:
if reg.endswith('PSR') or reg in ('R15', 'PC'):
continue
val = state.cpu.read_register(reg)
gdb.setR(reg, val)
# Ignore Linux kernel helpers
if (state.cpu.PC >> 16) == 0xffff:
in_helper = True
return
# If we executed a few instructions of a helper, we need to sync Manticore's
# state to GDB as soon as we stop executing a helper.
if in_helper:
for reg in state.cpu.canonical_registers:
if reg.endswith('PSR'):
continue
# Don't sync pc
if reg == 'R15':
continue
gdb.setR(reg, state.cpu.read_register(reg))
in_helper = False
if cmp_regs(state.cpu):
cmp_regs(state.cpu, should_print=True)
state.abandon()
def post_mcore(state, last_instruction):
'''
Handle syscalls (import memory) and bail if we diverge
'''
global in_helper
# Synchronize qemu state to manticore's after a system call
if last_instruction.mnemonic.lower() == 'svc':
# Syncronize all writes that have happened
writes = state.cpu.memory.pop_record_writes()
if writes:
logger.debug("Got %d writes", len(writes))
for addr, val in writes:
gdb.setByte(addr, val[0])
# Write return val to gdb
gdb_r0 = gdb.getR('R0')
if gdb_r0 != state.cpu.R0:
logger.debug("Writing 0x{:x} to R0 (overwriting 0x{:x})".format(
state.cpu.R0, gdb.getR('R0')))
for reg in state.cpu.canonical_registers:
if reg.endswith('PSR') or reg in ('R15', 'PC'):
continue
val = state.cpu.read_register(reg)
gdb.setR(reg, val)
# Ignore Linux kernel helpers
if (state.cpu.PC >> 16) == 0xffff:
in_helper = True
return
# If we executed a few instructions of a helper, we need to sync Manticore's
# state to GDB as soon as we stop executing a helper.
if in_helper:
for reg in state.cpu.canonical_registers:
if reg.endswith('PSR'):
continue
# Don't sync pc
if reg == 'R15':
continue
gdb.setR(reg, state.cpu.read_register(reg))
in_helper = False
if cmp_regs(state.cpu):
cmp_regs(state.cpu, should_print=True)
state.abandon()