442 lines
17 KiB
Python
442 lines
17 KiB
Python
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# This script renders a graph of the MicroPython heap at the given point it was dumped.
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# It takes three files, the binary dump of ram, the binary for CircuitPython and the linker map file.
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# To dump ram do this in GDB: dump binary memory ram.bin &_srelocate &_estack
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import binascii
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import struct
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import sys
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import pygraphviz as pgv
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import io
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import html
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from analyze_mpy import Prelude
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BITS_PER_BYTE = 8
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BLOCKS_PER_ATB = 4
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BLOCKS_PER_FTB = 8
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BYTES_PER_BLOCK = 16
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AT_FREE = 0
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AT_HEAD = 1
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AT_TAIL = 2
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AT_MARK = 3
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MICROPY_QSTR_BYTES_IN_HASH = 1
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MICROPY_QSTR_BYTES_IN_LEN = 1
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MP_OBJ_NULL = 0
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MP_OBJ_SENTINEL = 4
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READLINE_HIST_SIZE = 8
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SKIP_SYMBOLS = [".debug_ranges", ".debug_frame", ".debug_loc", ".comment", ".debug_str", ".debug_line", ".debug_abbrev", ".debug_info", "COMMON"]
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ownership_graph = pgv.AGraph(directed=True)
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with open(sys.argv[1], "rb") as f:
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ram = f.read()
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with open(sys.argv[2], "rb") as f:
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rom = f.read()
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symbols = {} # name -> address, size
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symbol_lookup = {} # address -> name
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manual_symbol_map = {} # autoname -> name
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def add_symbol(name, address=None, size=None):
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global symbols
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if address:
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address = int(address, 0)
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if size:
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size = int(size, 0)
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if name in symbols:
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if address and symbols[name][0] and symbols[name][0] != address:
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print("Conflicting symbol: {}".format(name))
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return
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if not address:
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address = symbols[name][0]
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if not size:
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size = symbols[name][1]
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symbols[name] = (address, size)
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if address:
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if not size:
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size = 4
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for offset in range(0, size, 4):
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symbol_lookup[address + offset] = "{}+{}".format(name, offset)
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with open(sys.argv[3], "r") as f:
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common_symbols = False
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name = None
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for line in f:
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line = line.strip()
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parts = line.split()
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if line.startswith("Common symbol"):
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common_symbols = True
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if line == "Discarded input sections":
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common_symbols = False
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if common_symbols:
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if len(parts) == 1:
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name = parts[0]
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elif len(parts) == 2 and name:
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add_symbol(name, size=parts[0])
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name = None
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elif len(parts) == 3:
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add_symbol(parts[0], size=parts[1])
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name = None
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else:
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if len(parts) == 2 and parts[0].startswith("0x") and not parts[1].startswith("0x"):
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add_symbol(parts[1], parts[0])
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if len(parts) == 4 and parts[0] not in SKIP_SYMBOLS and parts[1].startswith("0x") and parts[2].startswith("0x"):
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name, address, size, source = parts
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if name.startswith((".text", ".rodata", ".bss")) and name.count(".") > 1:
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name = name.split(".")[-1]
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add_symbol(name, address, size)
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# Linker symbols
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if len(parts) >= 4 and parts[0].startswith("0x") and parts[2] == "=" and parts[1] != ".":
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add_symbol(parts[1], parts[0])
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rom_start = symbols["_sfixed"][0]
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ram_start = symbols["_srelocate"][0]
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def load(address, size=4):
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if size is None:
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raise ValueError("You must provide a size")
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if address > ram_start:
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ram_address = address - ram_start
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if (ram_address + size) > len(ram):
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raise ValueError("Unable to read 0x{:08x} from ram.".format(address))
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return ram[ram_address:ram_address+size]
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elif address < len(rom):
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if (address + size) > len(rom):
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raise ValueError("Unable to read 0x{:08x} from rom.".format(address))
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return rom[address:address+size]
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def load_pointer(address):
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return struct.unpack("<I", load(address))[0]
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heap_start, heap_size = symbols["heap"]
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heap = load(heap_start, heap_size)
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total_byte_len = len(heap)
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# These change every run so we load them from the symbol table
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mp_state_ctx = symbols["mp_state_ctx"][0]
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manual_symbol_map["mp_state_ctx+24"] = "mp_state_ctx.vm.last_pool"
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last_pool = load_pointer(mp_state_ctx + 24) # (gdb) p &mp_state_ctx.vm.last_pool
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manual_symbol_map["mp_state_ctx+92"] = "mp_state_ctx.vm.dict_main.map.table"
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dict_main_table = load_pointer(mp_state_ctx + 92) # (gdb) p &mp_state_ctx.vm.dict_main.map.table
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manual_symbol_map["mp_state_ctx+72"] = "mp_state_ctx.vm.mp_loaded_modules_dict.map.table"
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imports_table = load_pointer(mp_state_ctx + 72) # (gdb) p &mp_state_ctx.vm.mp_loaded_modules_dict.map.table
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manual_symbol_map["mp_state_ctx+108"] = "mp_state_ctx.vm.mp_sys_path_obj.items"
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manual_symbol_map["mp_state_ctx+124"] = "mp_state_ctx.vm.mp_sys_argv_obj.items"
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for i in range(READLINE_HIST_SIZE):
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manual_symbol_map["mp_state_ctx+{}".format(128 + i * 4)] = "mp_state_ctx.vm.readline_hist[{}]".format(i)
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tuple_type = symbols["mp_type_tuple"][0]
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type_type = symbols["mp_type_type"][0]
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map_type = symbols["mp_type_map"][0]
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dict_type = symbols["mp_type_dict"][0]
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property_type = symbols["mp_type_property"][0]
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str_type = symbols["mp_type_str"][0]
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function_types = [symbols["mp_type_fun_" + x][0] for x in ["bc", "builtin_0", "builtin_1", "builtin_2", "builtin_3", "builtin_var"]]
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bytearray_type = symbols["mp_type_bytearray"][0]
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dynamic_type = 0x40000000 # placeholder, doesn't match any memory
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type_colors = {
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dict_type: "red",
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property_type: "yellow",
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map_type: "blue",
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type_type: "orange",
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tuple_type: "skyblue",
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str_type: "pink",
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bytearray_type: "purple"
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}
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pool_shift = heap_start % BYTES_PER_BLOCK
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print("Total heap length:", total_byte_len)
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atb_length = total_byte_len * BITS_PER_BYTE // (BITS_PER_BYTE + BITS_PER_BYTE * BLOCKS_PER_ATB // BLOCKS_PER_FTB + BITS_PER_BYTE * BLOCKS_PER_ATB * BYTES_PER_BLOCK)
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print("ATB length:", atb_length)
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pool_length = atb_length * BLOCKS_PER_ATB * BYTES_PER_BLOCK
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print("Total allocatable:", pool_length)
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gc_finaliser_table_byte_len = (atb_length * BLOCKS_PER_ATB + BLOCKS_PER_FTB - 1) // BLOCKS_PER_FTB
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print("FTB length:", gc_finaliser_table_byte_len)
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pool_start = heap_start + total_byte_len - pool_length - pool_shift
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pool = heap[-pool_length-pool_shift:]
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map_element_blocks = [dict_main_table, imports_table]
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string_blocks = []
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bytecode_blocks = []
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qstr_pools = []
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qstr_chunks = []
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block_data = {}
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# Find all the qtr pool addresses.
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prev_pool = last_pool
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while prev_pool > ram_start:
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qstr_pools.append(prev_pool)
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prev_pool = load_pointer(prev_pool)
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longest_free = 0
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current_free = 0
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current_allocation = 0
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total_free = 0
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for i in range(atb_length):
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# Each atb byte is four blocks worth of info
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atb = heap[i]
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for j in range(4):
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block_state = (atb >> (j * 2)) & 0x3
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if block_state != AT_FREE and current_free > 0:
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print("{} bytes free".format(current_free * BYTES_PER_BLOCK))
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current_free = 0
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if block_state != AT_TAIL and current_allocation > 0:
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allocation_length = current_allocation * BYTES_PER_BLOCK
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end = (i * BLOCKS_PER_ATB + j) * BYTES_PER_BLOCK
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start = end - allocation_length
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address = pool_start + start
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data = pool[start:end]
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print("0x{:x} {} bytes allocated".format(address, allocation_length))
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rows = ""
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for k in range(current_allocation - 1):
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rows += "<tr>"
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for l in range(4):
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rows += "<td port=\"{}\" height=\"18\" width=\"20\"></td>".format(4 * (k + 1) + l)
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rows += "</tr>"
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table = "<<table bgcolor=\"gray\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"><tr><td colspan=\"4\" port=\"0\" height=\"18\" width=\"80\">0x{:08x}</td></tr>{}</table>>".format(address, rows)
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ownership_graph.add_node(address, label=table, style="invisible", shape="plaintext")
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potential_type = None
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node = ownership_graph.get_node(address)
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block_data[address] = data
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for k in range(len(data) // 4):
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word = struct.unpack_from("<I", data, offset=(k * 4))[0]
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if word < 0x00040000 and k == 0 or address in qstr_pools:
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potential_type = word
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bgcolor = "gray"
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if address in qstr_pools:
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bgcolor = "tomato"
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elif potential_type in function_types:
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bgcolor = "green"
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elif potential_type in type_colors:
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bgcolor = type_colors[potential_type]
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else:
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pass
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#print("unknown type", hex(potential_type))
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node.attr["label"] = "<" + node.attr["label"].replace("\"gray\"", "\"" + bgcolor + "\"") + ">"
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if potential_type == str_type and k == 3:
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string_blocks.append(word)
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if potential_type == dict_type:
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if k == 3:
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map_element_blocks.append(word)
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if ram_start < word < (ram_start + len(ram)) and word % 16 == 0:
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port = k
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if k < 4:
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port = 0
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ownership_graph.add_edge(address, word, tailport=str(port)+":_")
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#print(" 0x{:08x}".format(word))
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if address in qstr_pools:
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if k > 0:
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qstr_chunks.append(word)
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if k == 0:
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potential_type = dynamic_type
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if potential_type == dynamic_type:
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if k == 0:
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node.attr["fillcolor"] = "plum"
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if k == 3 and 0x20000000 < word < 0x20040000:
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map_element_blocks.append(word)
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if potential_type in function_types:
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if k == 2 and 0x20000000 < word < 0x20040000:
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bytecode_blocks.append(word)
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current_allocation = 0
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if block_state == AT_FREE:
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current_free += 1
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total_free += 1
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elif block_state == AT_HEAD:
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current_allocation = 1
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elif block_state == AT_TAIL:
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current_allocation += 1
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longest_free = max(longest_free, current_free)
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if current_free > 0:
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print("{} bytes free".format(current_free * BYTES_PER_BLOCK))
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def is_qstr(obj):
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return obj & 0xff800007 == 0x00000006
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def find_qstr(qstr_index):
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pool_ptr = last_pool
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if not is_qstr(qstr_index):
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return "object"
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qstr_index >>= 3
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while pool_ptr != 0:
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#print(hex(pool_ptr))
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if pool_ptr in block_data:
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pool = block_data[pool_ptr]
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prev, total_prev_len, alloc, length = struct.unpack_from("<IIII", pool)
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else:
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rom_offset = pool_ptr - rom_start
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prev, total_prev_len, alloc, length = struct.unpack_from("<IIII", rom[rom_offset:rom_offset+32])
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pool = rom[rom_offset:rom_offset+length*4]
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#print("rom pool")
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#print(hex(prev), total_prev_len, alloc, length)
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#print(qstr_index, total_prev_len)
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if qstr_index >= total_prev_len:
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offset = (qstr_index - total_prev_len) * 4 + 16
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start = struct.unpack_from("<I", pool, offset=offset)[0]
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#print(hex(start))
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if start < heap_start:
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start -= rom_start
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if start > len(rom):
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return "more than rom: {:x}".format(start + rom_start)
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qstr_hash, qstr_len = struct.unpack("<BB", rom[start:start+2])
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return rom[start+2:start+2+qstr_len].decode("utf-8")
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else:
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if start > heap_start + len(heap):
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return "out of range: {:x}".format(start)
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local = start - heap_start
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qstr_hash, qstr_len = struct.unpack("<BB", heap[local:local+2])
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return heap[local+2:local+2+qstr_len].decode("utf-8")
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pool_ptr = prev
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return "unknown"
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def format(obj):
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if obj & 1 != 0:
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return obj >> 1
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if is_qstr(obj):
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return find_qstr(obj)
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else:
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return "0x{:08x}".format(obj)
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for block in sorted(map_element_blocks):
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try:
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node = ownership_graph.get_node(block)
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except KeyError:
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print("Unable to find memory block for 0x{:08x}. Is there something running?".format(block))
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continue
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#node.attr["fillcolor"] = "gold"
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data = block_data[block]
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#print("0x{:08x}".format(block))
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cells = []
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for i in range(len(data) // 8):
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key, value = struct.unpack_from("<II", data, offset=(i * 8))
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if key == MP_OBJ_NULL or key == MP_OBJ_SENTINEL:
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#print(" <empty slot>")
|
||
|
|
cells.append(("", " "))
|
||
|
|
else:
|
||
|
|
#print(" {}, {}".format(format(key), format(value)))
|
||
|
|
cells.append((key, format(key)))
|
||
|
|
if value in block_data:
|
||
|
|
edge = ownership_graph.get_edge(block, value)
|
||
|
|
edge.attr["tailport"] = str(key)
|
||
|
|
rows = ""
|
||
|
|
for i in range(len(cells) // 2):
|
||
|
|
rows += "<tr><td port=\"{}\">{}</td><td port=\"{}\">{}</td></tr>".format(
|
||
|
|
cells[2*i][0],
|
||
|
|
cells[2*i][1],
|
||
|
|
cells[2*i+1][0],
|
||
|
|
cells[2*i+1][1])
|
||
|
|
node.attr["shape"] = "plaintext"
|
||
|
|
node.attr["style"] = "invisible"
|
||
|
|
node.attr["label"] = "<<table bgcolor=\"gold\" border=\"1\" cellpadding=\"0\" cellspacing=\"0\"><tr><td colspan=\"2\">0x{:08x}</td></tr>{}</table>>".format(block, rows)
|
||
|
|
|
||
|
|
for node, degree in ownership_graph.in_degree_iter():
|
||
|
|
if degree == 0:
|
||
|
|
address_bytes = struct.pack("<I", int(node))
|
||
|
|
location = -1
|
||
|
|
for _ in range(ram.count(address_bytes)):
|
||
|
|
location = ram.find(address_bytes, location + 1)
|
||
|
|
pointer_location = ram_start + location
|
||
|
|
source = "0x{:08x}".format(pointer_location)
|
||
|
|
if pointer_location in symbol_lookup:
|
||
|
|
source = symbol_lookup[pointer_location]
|
||
|
|
if source in manual_symbol_map:
|
||
|
|
source = manual_symbol_map[source]
|
||
|
|
if "readline_hist" in source:
|
||
|
|
string_blocks.append(int(node))
|
||
|
|
ownership_graph.add_edge(source, node)
|
||
|
|
|
||
|
|
for block in string_blocks:
|
||
|
|
node = ownership_graph.get_node(block)
|
||
|
|
node.attr["fillcolor"] = "hotpink"
|
||
|
|
string = block_data[block].decode('utf-8')
|
||
|
|
wrapped = []
|
||
|
|
for i in range(0, len(string), 16):
|
||
|
|
wrapped.append(string[i:i+16])
|
||
|
|
node.attr["label"] = "\n".join(wrapped)
|
||
|
|
node.attr["style"] = "filled"
|
||
|
|
node.attr["fontname"] = "FiraCode-Medium"
|
||
|
|
node.attr["fontpath"] = "/Users/tannewt/Library/Fonts/"
|
||
|
|
node.attr["fontsize"] = 8
|
||
|
|
|
||
|
|
for block in bytecode_blocks:
|
||
|
|
node = ownership_graph.get_node(block)
|
||
|
|
node.attr["fillcolor"] = "lightseagreen"
|
||
|
|
data = block_data[block]
|
||
|
|
prelude = Prelude(io.BufferedReader(io.BytesIO(data)))
|
||
|
|
node.attr["shape"] = "plaintext"
|
||
|
|
node.attr["style"] = "invisible"
|
||
|
|
code_info_size = prelude.code_info_size
|
||
|
|
rows = ""
|
||
|
|
remaining_bytecode = len(data) - 16
|
||
|
|
while code_info_size >= 16:
|
||
|
|
rows += "<tr><td colspan=\"16\" bgcolor=\"palegreen\" height=\"18\" width=\"80\"></td></tr>"
|
||
|
|
code_info_size -= 16
|
||
|
|
remaining_bytecode -= 16
|
||
|
|
if code_info_size > 0:
|
||
|
|
rows += ("<tr><td colspan=\"{}\" bgcolor=\"palegreen\" height=\"18\" width=\"{}\"></td>"
|
||
|
|
"<td colspan=\"{}\" bgcolor=\"seagreen\" height=\"18\" width=\"{}\"></td></tr>"
|
||
|
|
).format(code_info_size, code_info_size * (80 / 16), (16 - code_info_size), (80 / 16) * (16 - code_info_size))
|
||
|
|
remaining_bytecode -= 16
|
||
|
|
for i in range(remaining_bytecode // 16):
|
||
|
|
rows += "<tr><td colspan=\"16\" bgcolor=\"seagreen\" height=\"18\" width=\"80\"></td></tr>"
|
||
|
|
node.attr["label"] = "<<table border=\"1\" cellspacing=\"0\"><tr><td colspan=\"16\" bgcolor=\"lightseagreen\" height=\"18\" width=\"80\">0x{:08x}</td></tr>{}</table>>".format(block, rows)
|
||
|
|
|
||
|
|
for block in qstr_chunks:
|
||
|
|
if block not in block_data:
|
||
|
|
ownership_graph.delete_node(block)
|
||
|
|
continue
|
||
|
|
data = block_data[block]
|
||
|
|
string = ""
|
||
|
|
offset = 0
|
||
|
|
while offset < len(data) - 1:
|
||
|
|
qstr_hash, qstr_len = struct.unpack_from("<BB", data, offset=offset)
|
||
|
|
if qstr_hash == 0:
|
||
|
|
string += " " * (len(data) - offset)
|
||
|
|
offset = len(data)
|
||
|
|
continue
|
||
|
|
offset += 2 + qstr_len + 1
|
||
|
|
string += " " + data[offset - qstr_len - 1: offset - 1].decode("utf-8")
|
||
|
|
#print(string)
|
||
|
|
wrapped = []
|
||
|
|
for i in range(0, len(string), 16):
|
||
|
|
wrapped.append(html.escape(string[i:i+16]))
|
||
|
|
node = ownership_graph.get_node(block)
|
||
|
|
node.attr["label"] = "<<table border=\"1\" cellspacing=\"0\" bgcolor=\"lightsalmon\" width=\"80\"><tr><td height=\"18\" >0x{:08x}</td></tr><tr><td height=\"{}\" >{}</td></tr></table>>".format(block, 18 * (len(wrapped) - 1), "<br/>".join(wrapped))
|
||
|
|
node.attr["fontname"] = "FiraCode-Medium"
|
||
|
|
node.attr["fontpath"] = "/Users/tannewt/Library/Fonts/"
|
||
|
|
node.attr["fontsize"] = 8
|
||
|
|
|
||
|
|
print("Total free space:", BYTES_PER_BLOCK * total_free)
|
||
|
|
print("Longest free space:", BYTES_PER_BLOCK * longest_free)
|
||
|
|
|
||
|
|
with open("heap.dot", "w") as f:
|
||
|
|
f.write(ownership_graph.string())
|
||
|
|
|
||
|
|
ownership_graph.layout(prog="dot")
|
||
|
|
ownership_graph.draw("heap.png")
|