예제 #1
0
def parse_arenas():
    global jeheap

    jeheap.arenas[:] = []

    for i in range(0, jeheap.narenas):
        current_arena = jemalloc.arena(0, i, [])

        try:
            current_arena.addr = \
                dbg.to_int(dbg.eval_expr(dbg.arena_expr % (i)))
        except:
            print('[shadow] error: cannot evaluate arenas[%d]') % (i)
            sys.exit()

        for j in range(0, jeheap.nbins):
            nrg = 0
            run_sz = 0
            reg_size = 0
            reg_offset = 0
            end_addr = 0

            try:
                expr = dbg.arena_reg_size_expr % (i, j)
                reg_size = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_reg0_offset_expr % (i, j)
                reg_offset = dbg.to_int(dbg.eval_expr(expr))

            except:
                # XXX: for now assume it's a standalone variant; we
                #      need to do some error checking here too.
                jeheap.STANDALONE = true

                expr = dbg.arena_bin_info_reg_size_expr % (j)
                reg_size = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_bin_info_nregs_expr % (j)
                nrg = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_bin_info_run_size_expr % (j)
                run_sz = dbg.to_int(dbg.eval_expr(expr))

            try:
                expr = dbg.arena_runcur_expr % (i, j)
                runcur_addr = runcur = dbg.to_int(dbg.eval_expr(expr))

                end_addr = runcur_addr + run_sz

                if runcur != 0:
                    current_run = \
                        jemalloc.arena_run(runcur, end_addr, run_sz, 0, \
                            int(reg_size), reg_offset, nrg, 0, [])

                    current_bin = jemalloc.arena_bin(0, j, current_run)

                    current_bin.addr = \
                        dbg.to_int(dbg.eval_expr(dbg.arena_bin_addr_expr % (i, j)))

                    current_arena.bins.append(current_bin)

                else:
                    # no regions for this size class yet, therefore no runcur
                    current_run = jemalloc.arena_run()
                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_arena.bins.append(current_bin)

            except:
                current_run = jemalloc.arena_run()
                current_bin = jemalloc.arena_bin(0, j, current_run)
                current_arena.bins.append(current_bin)
                continue

        # add arena to the list of arenas
        jeheap.arenas.append(current_arena)
예제 #2
0
def parse_run(run_addr, proc=none):
    '''Given a run's address return a jemalloc.arena_run object'''

    global jeheap

    new_run = jemalloc.arena_run()
    new_run.start = run_addr

    try:
        new_run.bin_addr = dbg.read_memory(new_run.start, jeheap.DWORD_SIZE,
                                           proc)

        if jeheap.STANDALONE == false:
            new_run.size = dbg.read_memory(new_run.bin_addr + \
                    (6 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

            new_run.end = new_run.start + new_run.size

            new_run.region_size = dbg.read_memory(new_run.bin_addr + \
                    (5 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

            new_run.total_regions = dbg.read_memory(new_run.bin_addr + \
                    (7 * jeheap.DWORD_SIZE), jemalloc.INT_SIZE, proc)

            if new_run.total_regions > 10000 or new_run.total_regions <= 0:
                return none
    except:
        # print('[shadow] error parsing the metadata of run 0x%08x' % (run_addr))
        return none

    # XXX: this isn't correct on jemalloc standalone *debug* variant
    try:
        new_run.free_regions = dbg.read_memory(new_run.start + \
                jeheap.DWORD_SIZE + jemalloc.INT_SIZE, jemalloc.INT_SIZE, proc)
    except:
        # print('[shadow] error parsing the free regions of run 0x%08x' % (run_addr))
        new_run.free_regions = 0

    if new_run.free_regions < 0:
        new_run.free_regions = 0

    # delete the run's regions
    new_run.regions[:] = []

    # parse the run's regions
    new_run.reg0_offset = dbg.read_memory(new_run.bin_addr + \
            (9 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

    if new_run.reg0_offset > 10000 or new_run.reg0_offset <= 0:
        return none

    first_region_addr = reg0_addr = run_addr + new_run.reg0_offset
    regs_mask_bits = (new_run.total_regions / 8) + 1

    regs_mask_addr = 0
    regs_mask_str = ''

    if dbg_engine == 'gdb':
        regs_mask_addr = dbg.to_int(dbg.execute(dbg.regs_mask_addr_expr % \
                (run_addr)))

        regs_mask_str = dbg.execute(dbg.regs_mask_addr_bits_expr % \
                (regs_mask_bits, regs_mask_addr))

    elif dbg_engine == 'pykd':
        regs_mask_addr = dbg.to_int(dbg.eval_expr(dbg.regs_mask_addr_expr % \
                (run_addr)))

        regs_mask_str = dbg.execute(dbg.regs_mask_addr_bits_expr % \
                (regs_mask_addr, regs_mask_bits))

    else:  # lldb
        regs_mask_str = ''

    regs_mask = ''

    if dbg_engine == 'gdb':

        for line in regs_mask_str.splitlines():
            line = line[line.find(dbg.address_separator) + \
                    len(dbg.address_separator) : line.find('\n')]

            line = line.replace('\n', '')
            line = line.replace('\t', '')
            line = line.replace(' ', '')

            regs_mask += line

    elif dbg_engine == 'pykd':

        lines = regs_mask_str.splitlines()
        lines = lines[2:]

        for line in lines:
            line = line[line.find(dbg.address_separator) + \
                    len(dbg.address_separator) : \
                    line.rfind(dbg.address_separator)]

            line = line.replace('\n', '')
            line = line.replace('\t', '')
            line = line.replace(' ', '')

            regs_mask += line

    else:  # lldb
        regs_mask = ''

    new_run.regs_mask = regs_mask

    first_region = jemalloc.region(0, first_region_addr, \
            int(new_run.regs_mask[0]))

    try:
        first_region.content_preview = hex(dbg.read_memory(first_region.addr, \
                jemalloc.INT_SIZE, proc)).rstrip('L')
    except:
        print('[shadow] error reading the first dword of region 0x%08x' \
                % (first_region.addr))

        first_region.content_preview = ''

    new_run.regions.append(first_region)

    for i in range(1, new_run.total_regions):
        try:
            current_region = jemalloc.region(i, 0, int(new_run.regs_mask[i]))
        except:
            current_region = jemalloc.region(i, 0, 0)

        current_region.addr = reg0_addr + (i * new_run.region_size)

        try:
            current_region.content_preview = \
                    hex(dbg.read_memory(current_region.addr, jemalloc.INT_SIZE, proc)).rstrip('L')
        except:
            current_region.content_preview = ''

        new_run.regions.append(current_region)

    return new_run
예제 #3
0
def jeparse_all_runs(proc):
    global jeheap

    # number of pages a chunk occupies
    chunk_npages = jeheap.chunk_size >> 12

    # offset of bits in arena_chunk_map_t in double words
    bitmap_offset = \
        gdbutil.offsetof('arena_chunk_map_t', 'bits') / jeheap.DWORD_SIZE

    # number of double words occupied by an arena_chunk_map_t
    chunk_map_dwords = \
        (bitmap_offset / jeheap.DWORD_SIZE) + 1

    # prefix to use in gdb's examine command
    if jeheap.DWORD_SIZE == 8:
        dword_fmt = 'g'
    else:
        dword_fmt = 'w'

    # the 12 least significant bits of each bitmap entry hold
    # various flags for the corresponding run
    flags_mask = (1 << 12) - 1

    # delete the heap's runs' array
    jeheap.runs[:] = []

    for chunk in jeheap.chunks:
        if not chunk.arena:
            continue

        try:
            # parse the whole map at once to avoid gdb delays
            expr = 'x/%d%sx ((arena_chunk_t *)%#x)->map' % \
                (chunk_npages * chunk_map_dwords, dword_fmt, chunk.addr)
        except:
            print '[unmask_jemalloc] error: cannot read bitmap from chunk %#x' (chunk.addr)
            sys.exit()

        lines = (gdb.execute(expr, to_string = true)).split('\n')

        dwords = []
        for line in lines:
            dwords += [int(dw, 16) for dw in line[line.find(':') + 1:].split()]

        bitmap = [dwords[i] for i in range(bitmap_offset, len(dwords), bitmap_offset + 1)]

        # traverse the bitmap
        for mapelm in bitmap:
            flags = mapelm & flags_mask

            # flags == 1 means the chunk is small and the rest of the bits
            # hold the actual run address
            if flags == 1:
                addr = mapelm & ~flags_mask
                size = gdbutil.get_page_size()

            # flags = 3 indicates a large chunk; calculate the run's address
            # directly from the map element index and extract the run's size 
            elif flags == 3:
                addr = chunk.addr + i * gdbutil.get_page_size()
                size = mapelm & ~flags_mask

            # run is not allocated? skip it
            else:
                continue
    
            if addr not in [a for (a, s) in runs]:
                # XXX: we need to parse run headers here with a
                #      dedicated function
                new_run = jemalloc.arena_run(addr, 0, size, 0, 0, 0, 0, 0, [])
                jeheap.runs.append(new_run)
예제 #4
0
def jeparse_arenas():
    global jeheap

    jeheap.arenas[:] = []

    for i in range(0, jeheap.narenas):
        current_arena = jemalloc.arena(0, i, [])

        try:
            current_arena.addr = \
                gdbutil.to_int(gdb.parse_and_eval('arenas[%d]' % (i)))
        except:
            print '[unmask_jemalloc] error: cannot evaluate arenas[%d]' % (i)
            sys.exit()

        for j in range(0, jeheap.nbins):
            nrg        = 0
            run_sz     = 0
            reg_size   = 0
            reg_offset = 0
            end_addr   = 0

            try:
                expr = 'arenas[%d].bins[%d].reg_size' % (i, j)
                reg_size = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))
               
                expr = 'arenas[%d].bins[%d].reg0_offset' % (i, j) 
                reg_offset = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

            except RuntimeError:
                # XXX: for now assume it's a standalone variant; we
                #      need to do some error checking here too.
                jeheap.STANDALONE = true

                expr = 'arena_bin_info[%d].reg_size' % (j)
                reg_size = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

                expr = 'arena_bin_info[%d].nregs' % (j)
                nrg = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

                expr = 'arena_bin_info[%d].run_size' % (j)
                run_sz = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

            try:
                expr = 'arenas[%d].bins[%d].runcur' % (i, j)
                runcur_addr = runcur = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))
                end_addr = runcur_addr + run_sz

                if runcur != 0:
                    current_run = \
                        jemalloc.arena_run(runcur, end_addr, run_sz, 0, \
                            int(reg_size), reg_offset, nrg, 0, [])

                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_bin.addr = \
                        gdbutil.to_int(gdb.parse_and_eval('&arenas[%d].bins[%d]' % (i, j)))

                    current_arena.bins.append(current_bin)

                else:
                    # no regions for this size class yet, therefore no runcur
                    current_run = jemalloc.arena_run()
                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_arena.bins.append(current_bin)

            except RuntimeError:
                current_run = jemalloc.arena_run()
                current_bin = jemalloc.arena_bin(0, j, current_run)
                current_arena.bins.append(current_bin)
                continue

        # add arena to the list of arenas
        jeheap.arenas.append(current_arena)
예제 #5
0
def jeparse_arenas():
    global jeheap

    jeheap.arenas[:] = []

    for i in range(0, jeheap.narenas):
        current_arena = jemalloc.arena(0, i, [])

        try:
            current_arena.addr = \
                gdbutil.to_int(gdb.parse_and_eval('arenas[%d]' % (i)))
        except:
            print('[unmask_jemalloc] error: cannot evaluate arenas[%d]') % (i)
            sys.exit()

        for j in range(0, jeheap.nbins):
            nrg = 0
            run_sz = 0
            reg_size = 0
            reg_offset = 0
            end_addr = 0

            try:
                expr = 'arenas[%d].bins[%d].reg_size' % (i, j)
                reg_size = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

                expr = 'arenas[%d].bins[%d].reg0_offset' % (i, j)
                reg_offset = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

            except RuntimeError:
                # XXX: for now assume it's a standalone variant; we
                #      need to do some error checking here too.
                jeheap.STANDALONE = true

                expr = 'arena_bin_info[%d].reg_size' % (j)
                reg_size = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

                expr = 'arena_bin_info[%d].nregs' % (j)
                nrg = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

                expr = 'arena_bin_info[%d].run_size' % (j)
                run_sz = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))

            try:
                expr = 'arenas[%d].bins[%d].runcur' % (i, j)
                runcur_addr = runcur = \
                    gdbutil.to_int(gdb.parse_and_eval(expr))
                end_addr = runcur_addr + run_sz

                if runcur != 0:
                    current_run = \
                        jemalloc.arena_run(runcur, end_addr, run_sz, 0, \
                            int(reg_size), reg_offset, nrg, 0, [])

                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_bin.addr = \
                        gdbutil.to_int(gdb.parse_and_eval('&arenas[%d].bins[%d]' % (i, j)))

                    current_arena.bins.append(current_bin)

                else:
                    # no regions for this size class yet, therefore no runcur
                    current_run = jemalloc.arena_run()
                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_arena.bins.append(current_bin)

            except RuntimeError:
                current_run = jemalloc.arena_run()
                current_bin = jemalloc.arena_bin(0, j, current_run)
                current_arena.bins.append(current_bin)
                continue

        # add arena to the list of arenas
        jeheap.arenas.append(current_arena)
예제 #6
0
def jeparse_all_runs(proc):
    global jeheap

    # number of pages a chunk occupies
    chunk_npages = jeheap.chunk_size >> 12

    # offset of bits in arena_chunk_map_t in double words
    bitmap_offset = \
        gdbutil.offsetof('arena_chunk_map_t', 'bits') / jeheap.DWORD_SIZE

    # number of double words occupied by an arena_chunk_map_t
    chunk_map_dwords = \
        (bitmap_offset / jeheap.DWORD_SIZE) + 1

    # prefix to use in gdb's examine command
    if jeheap.DWORD_SIZE == 8:
        dword_fmt = 'g'
    else:
        dword_fmt = 'w'

    # the 12 least significant bits of each bitmap entry hold
    # various flags for the corresponding run
    flags_mask = (1 << 12) - 1

    # delete the heap's runs' array
    jeheap.runs[:] = []

    for chunk in jeheap.chunks:
        if not chunk.arena:
            continue

        try:
            # parse the whole map at once to avoid gdb delays
            expr = 'x/%d%sx ((arena_chunk_t *)%#x)->map' % \
                (chunk_npages * chunk_map_dwords, dword_fmt, chunk.addr)
        except:
            print(
                '[unmask_jemalloc] error: cannot read bitmap from chunk %#x' %
                (chunk.addr))
            sys.exit()

        lines = (gdb.execute(expr, to_string=true)).split('\n')

        dwords = []
        i = 0

        for line in lines:
            dwords += [int(dw, 16) for dw in line[line.find(':') + 1:].split()]

        bitmap = [dwords[i] for i in range(int(bitmap_offset), \
                int(len(dwords)), int(bitmap_offset + 1))]

        # traverse the bitmap
        for mapelm in bitmap:
            flags = mapelm & flags_mask

            # flags == 1 means the chunk is small and the rest of the bits
            # hold the actual run address
            if flags == 1:
                addr = mapelm & ~flags_mask
                size = gdbutil.get_page_size()

            # flags = 3 indicates a large chunk; calculate the run's address
            # directly from the map element index and extract the run's size
            elif flags == 3:
                addr = chunk.addr + i * gdbutil.get_page_size()
                size = mapelm & ~flags_mask

            # run is not allocated? skip it
            else:
                continue

            if addr not in [r.start for r in jeheap.runs]:
                # XXX: we need to parse run headers here with a
                #      dedicated function
                new_run = jemalloc.arena_run(addr, 0, size, 0, 0, 0, 0, 0, [])
                jeheap.runs.append(new_run)
예제 #7
0
def parse_run(run_addr, proc=none):
    """Given a run's address return a jemalloc.arena_run object"""

    global jeheap

    new_run = jemalloc.arena_run()
    new_run.start = run_addr

    try:
        new_run.bin_addr = dbg.read_memory(new_run.start, jeheap.DWORD_SIZE, proc)

        if jeheap.STANDALONE == false:
            new_run.size = dbg.read_memory(new_run.bin_addr + (6 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

            new_run.end = new_run.start + new_run.size

            new_run.region_size = dbg.read_memory(new_run.bin_addr + (5 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

            new_run.total_regions = dbg.read_memory(new_run.bin_addr + (7 * jeheap.DWORD_SIZE), jemalloc.INT_SIZE, proc)

            if new_run.total_regions > 10000 or new_run.total_regions <= 0:
                return none
    except:
        # print('[shadow] error parsing the metadata of run 0x%08x' % (run_addr))
        return none

    # XXX: this isn't correct on jemalloc standalone *debug* variant
    try:
        new_run.free_regions = dbg.read_memory(
            new_run.start + jeheap.DWORD_SIZE + jemalloc.INT_SIZE, jemalloc.INT_SIZE, proc
        )
    except:
        # print('[shadow] error parsing the free regions of run 0x%08x' % (run_addr))
        new_run.free_regions = 0

    if new_run.free_regions < 0:
        new_run.free_regions = 0

    # delete the run's regions
    new_run.regions[:] = []

    # parse the run's regions
    new_run.reg0_offset = dbg.read_memory(new_run.bin_addr + (9 * jeheap.DWORD_SIZE), jeheap.DWORD_SIZE, proc)

    if new_run.reg0_offset > 10000 or new_run.reg0_offset <= 0:
        return none

    first_region_addr = reg0_addr = run_addr + new_run.reg0_offset
    regs_mask_bits = (new_run.total_regions / 8) + 1

    regs_mask_addr = 0
    regs_mask_str = ""

    if dbg_engine == "gdb":
        regs_mask_addr = dbg.to_int(dbg.execute(dbg.regs_mask_addr_expr % (run_addr)))

        regs_mask_str = dbg.execute(dbg.regs_mask_addr_bits_expr % (regs_mask_bits, regs_mask_addr))

    elif dbg_engine == "pykd":
        regs_mask_addr = dbg.to_int(dbg.eval_expr(dbg.regs_mask_addr_expr % (run_addr)))

        regs_mask_str = dbg.execute(dbg.regs_mask_addr_bits_expr % (regs_mask_addr, regs_mask_bits))

    else:  # lldb
        regs_mask_str = ""

    regs_mask = ""

    if dbg_engine == "gdb":

        for line in regs_mask_str.splitlines():
            line = line[line.find(dbg.address_separator) + len(dbg.address_separator) : line.find("\n")]

            line = line.replace("\n", "")
            line = line.replace("\t", "")
            line = line.replace(" ", "")

            regs_mask += line

    elif dbg_engine == "pykd":

        lines = regs_mask_str.splitlines()
        lines = lines[2:]

        for line in lines:
            line = line[
                line.find(dbg.address_separator) + len(dbg.address_separator) : line.rfind(dbg.address_separator)
            ]

            line = line.replace("\n", "")
            line = line.replace("\t", "")
            line = line.replace(" ", "")

            regs_mask += line

    else:  # lldb
        regs_mask = ""

    new_run.regs_mask = regs_mask

    first_region = jemalloc.region(0, first_region_addr, int(new_run.regs_mask[0]))

    try:
        first_region.content_preview = hex(dbg.read_memory(first_region.addr, jemalloc.INT_SIZE, proc)).rstrip("L")
    except:
        print("[shadow] error reading the first dword of region 0x%08x" % (first_region.addr))

        first_region.content_preview = ""

    new_run.regions.append(first_region)

    for i in range(1, new_run.total_regions):
        try:
            current_region = jemalloc.region(i, 0, int(new_run.regs_mask[i]))
        except:
            current_region = jemalloc.region(i, 0, 0)

        current_region.addr = reg0_addr + (i * new_run.region_size)

        try:
            current_region.content_preview = hex(dbg.read_memory(current_region.addr, jemalloc.INT_SIZE, proc)).rstrip(
                "L"
            )
        except:
            current_region.content_preview = ""

        new_run.regions.append(current_region)

    return new_run
예제 #8
0
def parse_arenas():
    global jeheap

    jeheap.arenas[:] = []

    for i in range(0, jeheap.narenas):
        current_arena = jemalloc.arena(0, i, [])

        try:
            current_arena.addr = dbg.to_int(dbg.eval_expr(dbg.arena_expr % (i)))
        except:
            print("[shadow] error: cannot evaluate arenas[%d]") % (i)
            sys.exit()

        for j in range(0, jeheap.nbins):
            nrg = 0
            run_sz = 0
            reg_size = 0
            reg_offset = 0
            end_addr = 0

            try:
                expr = dbg.arena_reg_size_expr % (i, j)
                reg_size = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_reg0_offset_expr % (i, j)
                reg_offset = dbg.to_int(dbg.eval_expr(expr))

            except:
                # XXX: for now assume it's a standalone variant; we
                #      need to do some error checking here too.
                jeheap.STANDALONE = true

                expr = dbg.arena_bin_info_reg_size_expr % (j)
                reg_size = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_bin_info_nregs_expr % (j)
                nrg = dbg.to_int(dbg.eval_expr(expr))

                expr = dbg.arena_bin_info_run_size_expr % (j)
                run_sz = dbg.to_int(dbg.eval_expr(expr))

            try:
                expr = dbg.arena_runcur_expr % (i, j)
                runcur_addr = runcur = dbg.to_int(dbg.eval_expr(expr))

                end_addr = runcur_addr + run_sz

                if runcur != 0:
                    current_run = jemalloc.arena_run(runcur, end_addr, run_sz, 0, int(reg_size), reg_offset, nrg, 0, [])

                    current_bin = jemalloc.arena_bin(0, j, current_run)

                    current_bin.addr = dbg.to_int(dbg.eval_expr(dbg.arena_bin_addr_expr % (i, j)))

                    current_arena.bins.append(current_bin)

                else:
                    # no regions for this size class yet, therefore no runcur
                    current_run = jemalloc.arena_run()
                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_arena.bins.append(current_bin)

            except:
                current_run = jemalloc.arena_run()
                current_bin = jemalloc.arena_bin(0, j, current_run)
                current_arena.bins.append(current_bin)
                continue

        # add arena to the list of arenas
        jeheap.arenas.append(current_arena)
def jeparse_arenas():
    global jeheap

    jeheap.arenas[:] = []

    for i in range(0, jeheap.narenas):
        current_arena = jemalloc.arena(0, i, [])

        try:
            current_arena.addr = \
                gdbutil.to_int(gdb.parse_and_eval('je_arenas[%d]' % (i)))
        except:
            print('[unmask_jemalloc] error: cannot evaluate je_arenas[%d]') % (i)
            sys.exit()

        for j in range(0, jeheap.nbins):
            nrg        = 0
            run_sz     = 0
            reg_size   = 0
            reg_offset = 0
            end_addr   = 0

            jeheap.STANDALONE = true

            reg_size = gdbutil.to_int(gdb.parse_and_eval('je_arena_bin_info[%d].reg_size' % (j)))
            nrg = gdbutil.to_int(gdb.parse_and_eval('je_arena_bin_info[%d].nregs' % (j)))
            run_sz = gdbutil.to_int(gdb.parse_and_eval('je_arena_bin_info[%d].run_size' % (j)))
            reg_offset = gdbutil.to_int(gdb.parse_and_eval('je_arena_bin_info[%d].reg0_offset' % (j)))

            try:
                expr = 'je_arenas[%d].bins[%d].runcur' % (i, j)
                runcur_addr = runcur = gdbutil.to_int(gdb.parse_and_eval(expr))
                end_addr = runcur_addr + run_sz

                if runcur != 0:
                    expr = 'je_arenas[%d].bins[%d].runcur.nfree' % (i, j)
                    nfree = gdbutil.to_int(gdb.parse_and_eval(expr))
                
                    current_run = \
                        jemalloc.arena_run(runcur, end_addr, run_sz, 0, \
                            int(reg_size), reg_offset, nrg, nfree, [])

                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_bin.addr = \
                        gdbutil.to_int(gdb.parse_and_eval('&je_arenas[%d].bins[%d]' % (i, j)))

                    current_arena.bins.append(current_bin)

                else:
                    # no regions for this size class yet, therefore no runcur
                    current_run = jemalloc.arena_run()
                    current_bin = jemalloc.arena_bin(0, j, current_run)
                    current_arena.bins.append(current_bin)

            except RuntimeError:
                current_run = jemalloc.arena_run()
                current_bin = jemalloc.arena_bin(0, j, current_run)
                current_arena.bins.append(current_bin)
                continue

        # add arena to the list of arenas
        jeheap.arenas.append(current_arena)