# # Copyright (C) 2011 EADS France, Fabrice Desclaux # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License along # with this program; if not, write to the Free Software Foundation, Inc., # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. # from miasm2.core import asmbloc from miasm2.core.interval import interval from miasm2.core.utils import BoundedDict from miasm2.jitter.csts import * class JitCore(object): "JiT management. This is an abstract class" jitted_block_delete_cb = None jitted_block_max_size = 10000 def __init__(self, ir_arch, bs=None): """Initialise a JitCore instance. @ir_arch: ir instance for current architecture @bs: bitstream """ self.ir_arch = ir_arch self.bs = bs self.known_blocs = {} self.lbl2jitbloc = BoundedDict(self.jitted_block_max_size, delete_cb=self.jitted_block_delete_cb) self.lbl2bloc = {} self.log_mn = False self.log_regs = False self.log_newbloc = False self.segm_to_do = set() self.job_done = set() self.jitcount = 0 self.addr2obj = {} self.addr2objref = {} self.blocs_mem_interval = interval() self.disasm_cb = None self.split_dis = set() self.addr_mod = interval() self.options = {"jit_maxline": 50 # Maximum number of line jitted } self.mdis = asmbloc.disasmEngine(ir_arch.arch, ir_arch.attrib, bs, lines_wd=self.options["jit_maxline"], symbol_pool=ir_arch.symbol_pool, follow_call=False, dontdis_retcall=False, split_dis=self.split_dis, dis_bloc_callback=self.disasm_cb) def set_options(self, **kwargs): "Set options relative to the backend" self.options.update(kwargs) def clear_jitted_blocks(self): "Reset all jitted blocks" self.lbl2jitbloc.clear() self.lbl2bloc.clear() self.blocs_mem_interval = interval() def add_disassembly_splits(self, *args): """The disassembly engine will stop on address in args if they are not at the block beginning""" self.split_dis.update(set(args)) def remove_disassembly_splits(self, *args): """The disassembly engine will no longer stop on address in args""" self.split_dis.difference_update(set(args)) def load(self): "Initialise the Jitter" raise NotImplementedError("Abstract class") def get_bloc_min_max(self, cur_bloc): "Update cur_bloc to set min/max address" if cur_bloc.lines: cur_bloc.ad_min = cur_bloc.lines[0].offset cur_bloc.ad_max = cur_bloc.lines[-1].offset + cur_bloc.lines[-1].l def add_bloc_to_mem_interval(self, vm, bloc): "Update vm to include bloc addresses in its memory range" self.blocs_mem_interval += interval([(bloc.ad_min, bloc.ad_max - 1)]) vm.reset_code_bloc_pool() for a, b in self.blocs_mem_interval: vm.add_code_bloc(a, b + 1) def jitirblocs(self, label, irblocs): """JiT a group of irblocs. @label: the label of the irblocs @irblocs: a gorup of irblocs """ raise NotImplementedError("Abstract class") def add_bloc(self, b): """Add a bloc to JiT and JiT it. @b: the bloc to add """ irblocs = self.ir_arch.add_bloc(b, gen_pc_updt = True) b.irblocs = irblocs self.jitirblocs(b.label, irblocs) def disbloc(self, addr, vm): """Disassemble a new bloc and JiT it @addr: address of the block to disassemble (asm_label or int) @vm: VmMngr instance """ # Get the bloc if isinstance(addr, asmbloc.asm_label): addr = addr.offset # Prepare disassembler self.mdis.job_done.clear() self.mdis.lines_wd = self.options["jit_maxline"] self.mdis.dis_bloc_callback = self.disasm_cb # Disassemble it try: cur_bloc = self.mdis.dis_bloc(addr) except IOError: # vm_exception_flag is set cur_bloc = asmbloc.asm_bloc(label) # Logging if self.log_newbloc: print cur_bloc # Check for empty blocks if not cur_bloc.lines: raise ValueError("Cannot JIT a block without any assembly line") # Update label -> bloc self.lbl2bloc[cur_bloc.label] = cur_bloc # Store min/max bloc address needed in jit automod code self.get_bloc_min_max(cur_bloc) # JiT it self.add_bloc(cur_bloc) # Update jitcode mem range self.add_bloc_to_mem_interval(vm, cur_bloc) def jit_call(self, label, cpu, _vmmngr, breakpoints): """Call the function label with cpu and vmmngr states @label: function's label @cpu: JitCpu instance @breakpoints: Dict instance of used breakpoints """ return self.exec_wrapper(label, cpu, self.lbl2jitbloc.data, breakpoints) def runbloc(self, cpu, vm, lbl, breakpoints): """Run the bloc starting at lbl. @cpu: JitCpu instance @vm: VmMngr instance @lbl: target label """ if lbl is None: lbl = cpu.get_gpreg()[self.ir_arch.pc.name] if not lbl in self.lbl2jitbloc: # Need to JiT the bloc self.disbloc(lbl, vm) # Run the bloc and update cpu/vmmngr state ret = self.jit_call(lbl, cpu, vm, breakpoints) return ret def blocs2memrange(self, blocs): """Return an interval instance standing for blocs addresses @blocs: list of asm_bloc instances """ mem_range = interval() for b in blocs: mem_range += interval([(b.ad_min, b.ad_max - 1)]) return mem_range def __updt_jitcode_mem_range(self, vm): """Rebuild the VM blocs address memory range @vm: VmMngr instance """ # Reset the current pool vm.reset_code_bloc_pool() # Add blocs in the pool for a, b in self.blocs_mem_interval: vm.add_code_bloc(a, b + 1) def del_bloc_in_range(self, ad1, ad2): """Find and remove jitted bloc in range [ad1, ad2]. Return the list of bloc removed. @ad1: First address @ad2: Last address """ # Find concerned blocs modified_blocs = set() for b in self.lbl2bloc.values(): if not b.lines: continue if b.ad_max <= ad1 or b.ad_min >= ad2: # Bloc not modified pass else: # Modified blocs modified_blocs.add(b) # Generate interval to delete del_interval = self.blocs2memrange(modified_blocs) # Remove interval from monitored interval list self.blocs_mem_interval -= del_interval # Remove modified blocs for b in modified_blocs: try: for irbloc in b.irblocs: # Remove offset -> jitted bloc link if irbloc.label.offset in self.lbl2jitbloc: del(self.lbl2jitbloc[irbloc.label.offset]) except AttributeError: # The bloc has never been translated in IR if b.label.offset in self.lbl2jitbloc: del(self.lbl2jitbloc[b.label.offset]) # Remove label -> bloc link del(self.lbl2bloc[b.label]) return modified_blocs def updt_automod_code(self, vm): """Remove code jitted in range self.addr_mod @vm: VmMngr instance """ for addr_start, addr_stop in self.addr_mod: self.del_bloc_in_range(addr_start, addr_stop + 1) self.__updt_jitcode_mem_range(vm) self.addr_mod = interval() def automod_cb(self, addr=0, size=0): self.addr_mod += interval([(addr, addr + size / 8 - 1)]) return None