ramdump.py

# Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 and
# only version 2 as published by the Free Software Foundation.
#
# 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.

import sys
import re
import os
import struct
import gzip
import functools
import string
import random
import platform
import stat

from boards import get_supported_boards, get_supported_ids
from tempfile import NamedTemporaryFile

import gdbmi
from print_out import print_out_str
from mmu import Armv7MMU, Armv7LPAEMMU, Armv8MMU
import parser_util
import minidump_util
from importlib import import_module
import module_table

FP = 11
SP = 13
LR = 14
PC = 15

# The smem code is very stable and unlikely to go away or be changed.
# Rather than go through the hassel of parsing the id through gdb,
# just hard code it

SMEM_HW_SW_BUILD_ID = 0x89
BUILD_ID_LENGTH = 32

first_mem_file_names = ['EBICS0.BIN',
                        'EBI1.BIN', 'DDRCS0.BIN', 'ebi1_cs0.bin', 'DDRCS0_0.BIN']
extra_mem_file_names = ['EBI1CS1.BIN', 'DDRCS1.BIN', 'ebi1_cs1.bin',
                        'DDRCS0_1.BIN', 'DDRCS1_0.BIN', 'DDRCS1_1.BIN',
                        'DDRCS1_2.BIN', 'DDRCS1_3.BIN', 'DDRCS1_4.BIN',
                        'DDRCS1_5.BIN']

DDR_FILE_NAMES = ['DDRCS0.BIN', 'DDRCS1.BIN', 'DDRCS0_0.BIN',
                  'DDRCS1_0.BIN', 'DDRCS0_1.BIN', 'DDRCS1_1.BIN',
                  'DDR_0.BIN', 'DDR_1.BIN', 'DDR_2.BIN', 'DDR_3.BIN',
                  'RESET_INFO.BIN']
OTHER_DUMP_FILE_NAMES = ['PIMEM.BIN', 'OCIMEM.BIN','md_shared_imem.BIN',
                         'md_smem_info.BIN']
RAM_FILE_NAMES = set(DDR_FILE_NAMES +
                     OTHER_DUMP_FILE_NAMES +
                     first_mem_file_names +
                     extra_mem_file_names)


class AutoDumpInfo(object):
    priority = 0

    def __init__(self, autodumpdir):
        self.autodumpdir = autodumpdir
        self.ebi_files = []

    def parse(self):
        for (filename, base_addr) in self._parse():
            fullpath = os.path.join(self.autodumpdir, filename)
            if not os.path.exists(fullpath):
                continue
            end = base_addr + os.path.getsize(fullpath) - 1
            self.ebi_files.append((open(fullpath, 'rb'), base_addr, end, fullpath))
            # sort by addr, DDR files first. The goal is for
            # self.ebi_files[0] to be the DDR file with the lowest address.
            self.ebi_files.sort(
                key=lambda x: (os.path.basename(x[-1]) not in DDR_FILE_NAMES,
                               x[1]))

    def _parse(self):
        # Implementations should return an interable of (filename, base_addr)
        raise NotImplementedError


class AutoDumpInfoCMM(AutoDumpInfo):
    # Parses CMM scripts (like load.cmm)
    def _parse(self):
        filename = 'load.cmm'
        if not os.path.exists(os.path.join(self.autodumpdir, filename)):
            print_out_str('!!! AutoParse could not find load.cmm!')
            return

        with open(os.path.join(self.autodumpdir, filename)) as f:
            for line in f.readlines():
                words = line.split()
                if len(words) == 4 and words[1] in RAM_FILE_NAMES:
                    fname = words[1]
                    start = int(words[2], 16)
                    yield fname, start


class AutoDumpInfoDumpInfoTXT(AutoDumpInfo):
    # Parses dump_info.txt
    priority = 1

    def _parse(self):
        filename = 'dump_info.txt'
        if not os.path.exists(os.path.join(self.autodumpdir, filename)):
            print_out_str('!!! AutoParse could not find dump_info.txt!')
            return

        with open(os.path.join(self.autodumpdir, filename)) as f:
            for line in f.readlines():
                words = line.split()
                if not words or words[-1] not in RAM_FILE_NAMES:
                    continue
                fname = words[-1]
                start = int(words[1], 16)
                size = int(words[2])
                filesize = os.path.getsize(
                    os.path.join(self.autodumpdir, fname))
                if size != filesize:
                    print_out_str(
                        ("!!! Size of %s on disk (%d) doesn't match size " +
                         "from dump_info.txt (%d). Skipping...")
                        % (fname, filesize, size))
                    continue
                yield fname, start


class RamDump():
    """The main interface to the RAM dump"""

    class Unwinder ():

        class Stackframe ():

            def __init__(self, fp, sp, lr, pc):
                self.fp = fp
                self.sp = sp
                self.lr = lr
                self.pc = pc

        class UnwindCtrlBlock ():

            def __init__(self):
                self.vrs = 16 * [0]
                self.insn = 0
                self.entries = -1
                self.byte = -1
                self.index = 0

        def __init__(self, ramdump):
            start = ramdump.address_of('__start_unwind_idx')
            end = ramdump.address_of('__stop_unwind_idx')
            self.ramdump = ramdump
            if (start is None) or (end is None):
                if ramdump.arm64:
                    self.unwind_frame = self.unwind_frame_generic64
                else:
                    self.unwind_frame = self.unwind_frame_generic
                return None
            # addresses
            self.unwind_frame = self.unwind_frame_tables
            self.start_idx = start
            self.stop_idx = end
            self.unwind_table = []
            i = 0
            for addr in range(start, end, 8):
                r = ramdump.read_string(addr, '<II')
                if r is None:
                    break
                (a, b) = r
                self.unwind_table.append((a, b, start + 8 * i))
                i += 1

            ver = ramdump.version
            if re.search('3.0.\d', ver) is not None:
                self.search_idx = self.search_idx_3_0
            else:
                self.search_idx = self.search_idx_3_4
                # index into the table
                self.origin = self.unwind_find_origin()

        def unwind_find_origin(self):
            start = 0
            stop = len(self.unwind_table)
            while (start < stop):
                mid = start + ((stop - start) >> 1)
                if (self.unwind_table[mid][0] >= 0x40000000):
                    start = mid + 1
                else:
                    stop = mid
            return stop

        def unwind_frame_generic64(self, frame):
            fp = frame.fp
            low = frame.sp
            mask = (self.ramdump.thread_size) - 1
            high = (low + mask) & (~mask)

            if (fp < low or fp > high or fp & 0xf):
                return

            frame.sp = fp + 0x10
            frame.fp = self.ramdump.read_word(fp)
            frame.pc = self.ramdump.read_word(fp + 8)
            return 0

        def unwind_frame_generic(self, frame):
            high = 0
            fp = frame.fp

            low = frame.sp
            mask = (self.ramdump.thread_size) - 1

            high = (low + mask) & (~mask)  # ALIGN(low, THREAD_SIZE)

            # /* check current frame pointer is within bounds */
            if (fp < (low + 12) or fp + 4 >= high):
                return -1

            fp_is_at = self.ramdump.read_word(frame.fp - 12)
            sp_is_at = self.ramdump.read_word(frame.fp - 8)
            pc_is_at = self.ramdump.read_word(frame.fp - 4)

            frame.fp = fp_is_at
            frame.sp = sp_is_at
            frame.pc = pc_is_at

            return 0

        def walk_stackframe_generic(self, frame):
            while True:
                symname = self.ramdump.addr_to_symbol(frame.pc)
                print_out_str(symname)

                ret = self.unwind_frame_generic(frame)
                if ret < 0:
                    break

        def unwind_backtrace_generic(self, sp, fp, pc):
            frame = self.Stackframe()
            frame.fp = fp
            frame.pc = pc
            frame.sp = sp
            walk_stackframe_generic(frame)

        def search_idx_3_4(self, addr):
            start = 0
            stop = len(self.unwind_table)
            orig = addr

            if (addr < self.start_idx):
                stop = self.origin
            else:
                start = self.origin

            if (start >= stop):
                return None

            addr = (addr - self.unwind_table[start][2]) & 0x7fffffff

            while (start < (stop - 1)):
                mid = start + ((stop - start) >> 1)

                dif = (self.unwind_table[mid][2]
                       - self.unwind_table[start][2])
                if ((addr - dif) < self.unwind_table[mid][0]):
                    stop = mid
                else:
                    addr = addr - dif
                    start = mid

            if self.unwind_table[start][0] <= addr:
                return self.unwind_table[start]
            else:
                return None

        def search_idx_3_0(self, addr):
            first = 0
            last = len(self.unwind_table)
            while (first < last - 1):
                mid = first + ((last - first + 1) >> 1)
                if (addr < self.unwind_table[mid][0]):
                    last = mid
                else:
                    first = mid

            return self.unwind_table[first]

        def unwind_get_byte(self, ctrl):

            if (ctrl.entries <= 0):
                print_out_str('unwind: Corrupt unwind table')
                return 0

            val = self.ramdump.read_word(ctrl.insn)

            ret = (val >> (ctrl.byte * 8)) & 0xff

            if (ctrl.byte == 0):
                ctrl.insn += 4
                ctrl.entries -= 1
                ctrl.byte = 3
            else:
                ctrl.byte -= 1

            return ret

        def unwind_exec_insn(self, ctrl):
            insn = self.unwind_get_byte(ctrl)

            if ((insn & 0xc0) == 0x00):
                ctrl.vrs[SP] += ((insn & 0x3f) << 2) + 4
            elif ((insn & 0xc0) == 0x40):
                ctrl.vrs[SP] -= ((insn & 0x3f) << 2) + 4
            elif ((insn & 0xf0) == 0x80):
                vsp = ctrl.vrs[SP]
                reg = 4

                insn = (insn << 8) | self.unwind_get_byte(ctrl)
                mask = insn & 0x0fff
                if (mask == 0):
                    print_out_str("unwind: 'Refuse to unwind' instruction")
                    return -1

                # pop R4-R15 according to mask */
                load_sp = mask & (1 << (13 - 4))
                while (mask):
                    if (mask & 1):
                        ctrl.vrs[reg] = self.ramdump.read_word(vsp)
                        if ctrl.vrs[reg] is None:
                            return -1
                        vsp += 4
                    mask >>= 1
                    reg += 1
                if not load_sp:
                    ctrl.vrs[SP] = vsp

            elif ((insn & 0xf0) == 0x90 and (insn & 0x0d) != 0x0d):
                ctrl.vrs[SP] = ctrl.vrs[insn & 0x0f]
            elif ((insn & 0xf0) == 0xa0):
                vsp = ctrl.vrs[SP]
                a = list(range(4, 4 + (insn & 7)))
                a.append(4 + (insn & 7))
                # pop R4-R[4+bbb] */
                for reg in (a):
                    ctrl.vrs[reg] = self.ramdump.read_word(vsp)
                    if ctrl.vrs[reg] is None:
                        return -1
                    vsp += 4
                if (insn & 0x80):
                    ctrl.vrs[14] = self.ramdump.read_word(vsp)
                    if ctrl.vrs[14] is None:
                        return -1
                    vsp += 4
                ctrl.vrs[SP] = vsp
            elif (insn == 0xb0):
                if (ctrl.vrs[PC] == 0):
                    ctrl.vrs[PC] = ctrl.vrs[LR]
                ctrl.entries = 0
            elif (insn == 0xb1):
                mask = self.unwind_get_byte(ctrl)
                vsp = ctrl.vrs[SP]
                reg = 0

                if (mask == 0 or mask & 0xf0):
                    print_out_str('unwind: Spare encoding')
                    return -1

                # pop R0-R3 according to mask
                while mask:
                    if (mask & 1):
                        ctrl.vrs[reg] = self.ramdump.read_word(vsp)
                        if ctrl.vrs[reg] is None:
                            return -1
                        vsp += 4
                    mask >>= 1
                    reg += 1
                ctrl.vrs[SP] = vsp
            elif (insn == 0xb2):
                uleb128 = self.unwind_get_byte(ctrl)
                ctrl.vrs[SP] += 0x204 + (uleb128 << 2)
            else:
                print_out_str('unwind: Unhandled instruction')
                return -1

            return 0

        def prel31_to_addr(self, addr):
            value = self.ramdump.read_word(addr)
            # offset = (value << 1) >> 1
            # C wants this sign extended. Python doesn't do that.
            # Sign extend manually.
            if (value & 0x40000000):
                offset = value | 0x80000000
            else:
                offset = value

            # This addition relies on integer overflow
            # Emulate this behavior
            temp = addr + offset
            return (temp & 0xffffffff) + ((temp >> 32) & 0xffffffff)

        def unwind_frame_tables(self, frame):
            low = frame.sp
            high = ((low + (self.ramdump.thread_size - 1)) & \
                ~(self.ramdump.thread_size - 1)) + self.ramdump.thread_size
            idx = self.search_idx(frame.pc)

            if (idx is None):
                return -1

            ctrl = self.UnwindCtrlBlock()
            ctrl.vrs[FP] = frame.fp
            ctrl.vrs[SP] = frame.sp
            ctrl.vrs[LR] = frame.lr
            ctrl.vrs[PC] = 0

            if (idx[1] == 1):
                return -1

            elif ((idx[1] & 0x80000000) == 0):
                ctrl.insn = self.prel31_to_addr(idx[2] + 4)

            elif (idx[1] & 0xff000000) == 0x80000000:
                ctrl.insn = idx[2] + 4
            else:
                print_out_str('not supported')
                return -1

            val = self.ramdump.read_word(ctrl.insn)

            if ((val & 0xff000000) == 0x80000000):
                ctrl.byte = 2
                ctrl.entries = 1
            elif ((val & 0xff000000) == 0x81000000):
                ctrl.byte = 1
                ctrl.entries = 1 + ((val & 0x00ff0000) >> 16)
            else:
                return -1

            while (ctrl.entries > 0):
                urc = self.unwind_exec_insn(ctrl)
                if (urc < 0):
                    return urc
                if (ctrl.vrs[SP] < low or ctrl.vrs[SP] >= high):
                    return -1

            if (ctrl.vrs[PC] == 0):
                ctrl.vrs[PC] = ctrl.vrs[LR]

            # check for infinite loop */
            if (frame.pc == ctrl.vrs[PC]):
                return -1

            frame.fp = ctrl.vrs[FP]
            frame.sp = ctrl.vrs[SP]
            frame.lr = ctrl.vrs[LR]
            frame.pc = ctrl.vrs[PC]

            return 0

        def unwind_backtrace(self, sp, fp, pc, lr, extra_str='',
                             out_file=None):
            offset = 0
            frame = self.Stackframe(fp, sp, lr, pc)
            frame.fp = fp
            frame.sp = sp
            frame.lr = lr
            frame.pc = pc

            while True:
                where = frame.pc
                offset = 0

                if frame.pc is None:
                    break

                r = self.ramdump.unwind_lookup(frame.pc)
                if r is None:
                    symname = 'UNKNOWN'
                    offset = 0x0
                else:
                    symname, offset = r
                pstring = (
                    extra_str + '[<{0:x}>] {1}+0x{2:x}'.format(frame.pc, symname, offset))
                if out_file:
                    out_file.write(pstring + '\n')
                else:
                    print_out_str(pstring)

                urc = self.unwind_frame(frame)
                if urc < 0:
                    break

    def __init__(self, options, nm_path, gdb_path, objdump_path):
        self.ebi_files = []
        self.ebi_files_minidump = []
        self.ebi_pa_name_map = {}
        self.phys_offset = None
        self.kaslr_offset = options.kaslr_offset
        self.tz_start = 0
        self.ebi_start = 0
        self.cpu_type = None
        self.hw_id = options.force_hardware or None
        self.hw_version = options.force_hardware_version or None
        self.offset_table = []
        self.vmlinux = options.vmlinux
        self.nm_path = nm_path
        self.gdb_path = gdb_path
        self.objdump_path = objdump_path
        self.outdir = options.outdir
        self.imem_fname = None
        self.gdbmi = gdbmi.GdbMI(self.gdb_path, self.vmlinux,
                                 self.kaslr_offset or 0)
        self.gdbmi.open()
        self.arm64 = options.arm64
        self.page_offset = 0xc0000000
        self.thread_size = 8192
        self.qtf_path = options.qtf_path
        self.qtf = options.qtf
        self.skip_qdss_bin = options.skip_qdss_bin
        self.dcc = False
        self.sysreg = False
        self.t32_host_system = options.t32_host_system or None
        self.ipc_log_test = options.ipc_test
        self.ipc_log_skip = options.ipc_skip
        self.ipc_log_debug = options.ipc_debug
        self.ipc_log_help = options.ipc_help
        self.use_stdout = options.stdout
        self.kernel_version = (0, 0, 0)
        self.minidump = options.minidump
        self.elffile = None
        self.ram_elf_file = None
        self.ram_addr = options.ram_addr
        self.autodump = options.autodump
        self.module_table = module_table.module_table_class()
        self.module_table.setup_sym_path(options.sym_path)
        if self.minidump:
            try:
                mod = import_module('elftools.elf.elffile')
                ELFFile = mod.ELFFile
                StringTableSection = mod.StringTableSection
                mod = import_module('elftools.common.py3compat')
                bytes2str = mod.bytes2str
            except ImportError:
                print "Oops, missing required library for minidump. Check README"
                sys.exit(1)

        if options.ram_addr is not None:
            # TODO sanity check to make sure the memory regions don't overlap
            for file_path, start, end in options.ram_addr:
                fd = open(file_path, 'rb')
                if not fd:
                    print_out_str(
                        'Could not open {0}. Will not be part of dump'.format(file_path))
                    continue
                self.ebi_files.append((fd, start, end, file_path))
        elif not options.minidump:
            if not self.auto_parse(options.autodump):
                return None
        if options.minidump:
            file_path = options.ram_elf_addr
            self.ram_elf_file = file_path
            fd = open(file_path, 'rb')
            self.elffile = ELFFile(fd)
            for idx, s in enumerate(self.elffile.iter_segments()):
                pa = int(s['p_paddr'])
                va = int(s['p_vaddr'])
                size = int(s['p_filesz'])
                end_addr = pa + size
                for section in self.elffile.iter_sections():
                    if (not section.is_null() and
                            s.section_in_segment(section)):
                        self.ebi_pa_name_map[pa] = section.name
                self.ebi_files_minidump.append((idx, pa, end_addr, va,size))

        if options.minidump:
            if self.ebi_start == 0:
                self.ebi_start = self.ebi_files_minidump[0][1]
        else:
            if self.ebi_start == 0:
                self.ebi_start = self.ebi_files[0][1]
        if self.phys_offset is None:
            self.get_hw_id()

        if self.kaslr_offset is None:
            self.determine_kaslr_offset()
            self.gdbmi.kaslr_offset = self.get_kaslr_offset()

        if options.phys_offset is not None:
            print_out_str(
                '[!!!] Phys offset was set to {0:x}'.format(\
                    options.phys_offset))
            self.phys_offset = options.phys_offset

        self.wlan = options.wlan
        self.lookup_table = []
        self.config = []
        self.config_dict = {}
        if self.arm64:
            self.page_offset = 0xffffffc000000000
            self.thread_size = 16384
        if options.page_offset is not None:
            print_out_str(
                '[!!!] Page offset was set to {0:x}'.format(page_offset))
            self.page_offset = options.page_offset
        self.setup_symbol_tables()

        va_bits = 39
        modules_vsize = 0x08000000
        self.va_start = (0xffffffffffffffff << va_bits) \
            & 0xffffffffffffffff
        if self.address_of("kasan_init") is None:
            self.kasan_shadow_size = 0
        else:
            self.kasan_shadow_size = 1 << (va_bits - 3)

        self.kimage_vaddr = self.va_start + self.kasan_shadow_size + \
            modules_vsize
        self.kimage_vaddr = self.kimage_vaddr + self.get_kaslr_offset()
        self.modules_end = self.page_offset
        self.kimage_voffset = self.address_of("kimage_voffset")
        if self.kimage_voffset is not None:
            self.kimage_voffset = self.kimage_vaddr - self.phys_offset
            self.modules_end = self.kimage_vaddr
            print_out_str("The kimage_voffset extracted is: {:x}".format(self.kimage_voffset))

        # The address of swapper_pg_dir can be used to determine
        # whether or not we're running with LPAE enabled since an
        # extra 4k is needed for LPAE. If it's 0x5000 below
        # PAGE_OFFSET + TEXT_OFFSET then we know we're using LPAE. For
        # non-LPAE it should be 0x4000 below PAGE_OFFSET + TEXT_OFFSET
        self.swapper_pg_dir_addr = self.address_of('swapper_pg_dir')
        if self.swapper_pg_dir_addr is None:
            print_out_str('!!! Could not get the swapper page directory!')
            if not self.minidump:
                print_out_str(
                    '!!! Your vmlinux is probably wrong for these dumps')

                print_out_str('!!! Exiting now')
                sys.exit(1)

        stext = self.address_of('stext')
        if self.kimage_voffset is None:
            self.kernel_text_offset = stext - self.page_offset
        else:
            self.kernel_text_offset = stext - self.kimage_vaddr

        pg_dir_size = self.kernel_text_offset + self.page_offset \
            - self.swapper_pg_dir_addr

        if self.arm64:
            print_out_str('Using 64bit MMU')
            self.mmu = Armv8MMU(self)
        elif pg_dir_size == 0x4000:
            print_out_str('Using non-LPAE MMU')
            self.mmu = Armv7MMU(self)
        elif pg_dir_size == 0x5000:
            print_out_str('Using LPAE MMU')
            text_offset = 0x8000
            pg_dir_size = 0x5000    # 0x4000 for non-LPAE
            swapper_pg_dir_addr = self.phys_offset + text_offset - pg_dir_size

            # We deduce ttbr1 and ttbcr.t1sz based on the value of
            # PAGE_OFFSET. This is based on v7_ttb_setup in
            # arch/arm/mm/proc-v7-3level.S:

            # * TTBR0/TTBR1 split (PAGE_OFFSET):
            # *   0x40000000: T0SZ = 2, T1SZ = 0 (not used)
            # *   0x80000000: T0SZ = 0, T1SZ = 1
            # *   0xc0000000: T0SZ = 0, T1SZ = 2
            if self.page_offset == 0x40000000:
                t1sz = 0
            elif self.page_offset == 0x80000000:
                t1sz = 1
            elif self.page_offset == 0xc0000000:
                t1sz = 2
                # need to fixup ttbr1 since we'll be skipping the
                # first-level lookup (see v7_ttb_setup):
                # /* PAGE_OFFSET == 0xc0000000, T1SZ == 2 */
                # add      \ttbr1, \ttbr1, #4096 * (1 + 3) @ only L2 used, skip
                # pgd+3*pmd
                swapper_pg_dir_addr += (4096 * (1 + 3))
            else:
                raise Exception(
                    'Invalid phys_offset for page_table_walk: 0x%x'
                    % self.page_offset)
            self.mmu = Armv7LPAEMMU(self, swapper_pg_dir_addr, t1sz)
        else:
            print_out_str(
                "!!! Couldn't determine whether or not we're using LPAE!")
            print_out_str(
                '!!! This is a BUG in the parser and should be reported.')
            sys.exit(1)

        if not self.get_version():
            print_out_str('!!! Could not get the Linux version!')
            print_out_str(
                '!!! Your vmlinux is probably wrong for these dumps')
            print_out_str('!!! Exiting now')
            sys.exit(1)
        if not self.minidump:
            if not self.get_config():
                print_out_str('!!! Could not get saved configuration')
                print_out_str(
                    '!!! This is really bad and probably indicates RAM corruption')
                print_out_str('!!! Some features may be disabled!')

        self.unwind = self.Unwinder(self)
        if self.module_table.sym_path_exists():
            self.setup_module_symbols()
            self.gdbmi.setup_module_table(self.module_table)

    def __del__(self):
        self.gdbmi.close()

    def open_file(self, file_name, mode='wb'):
        """Open a file in the out directory.

        Example:

        >>> with self.ramdump.open_file('pizza.txt') as p:
                p.write('Pizza is the best\\n')
        """
        file_path = os.path.join(self.outdir, file_name)
        f = None
        try:
            dir_path = os.path.dirname(file_path)
            if not os.path.exists(dir_path) and 'w' in mode:
                os.makedirs(dir_path)
            f = open(file_path, mode)
        except:
            print_out_str('Could not open path {0}'.format(file_path))
            print_out_str('Do you have write/read permissions on the path?')
            sys.exit(1)
        return f

    def remove_file(self, file_name):
	file_path = os.path.join(self.outdir, file_name)
	try:
	    if (os.path.exists(file_path)):
		os.remove(file_path)
	except:
	    print_out_str('Could not remove file {0}'.format(file_path))
	    print_out_str('Do you have write/read permissions on the path?')
	    sys.exit(1)

    def get_config(self):
        kconfig_addr = self.address_of('kernel_config_data')
        if kconfig_addr is None:
            return
        kconfig_size = self.sizeof('kernel_config_data')
        # size includes magic, offset from it
        kconfig_size = kconfig_size - 16 - 1
        zconfig = NamedTemporaryFile(mode='wb', delete=False)
        # kconfig data starts with magic 8 byte string, go past that
        s = self.read_cstring(kconfig_addr, 8)
        if s != 'IKCFG_ST':
            return
        kconfig_addr = kconfig_addr + 8
        for i in range(0, kconfig_size):
            val = self.read_byte(kconfig_addr + i)
            zconfig.write(struct.pack('<B', val))

        zconfig.close()
        zconfig_in = gzip.open(zconfig.name, 'rb')
        try:
            t = zconfig_in.readlines()
        except:
            return False
        zconfig_in.close()
        os.remove(zconfig.name)
        for l in t:
            self.config.append(l.rstrip().decode('ascii', 'ignore'))
            if not l.startswith('#') and l.strip() != '':
                eql = l.find('=')
                cfg = l[:eql]
                val = l[eql+1:]
                self.config_dict[cfg] = val.strip()
        return True

    def get_config_val(self, config):
        """Gets the value of a kernel config option.

        Example:

        >>> va_bits = int(dump.get_config_val("CONFIG_ARM64_VA_BITS"))
        39
        """
        return self.config_dict.get(config)

    def is_config_defined(self, config):
        s = config + '=y'
        return s in self.config

    def kernel_virt_to_phys(self, addr):
        if self.minidump:
            return minidump_util.minidump_virt_to_phys(self.ebi_files_minidump,addr)
        else:
            va_bits = 39
            if self.kimage_voffset is None:
                return addr - self.page_offset + self.phys_offset
            else:
                if addr & (1 << (va_bits - 1)):
                    return addr - self.page_offset + self.phys_offset
                else:
                    return addr - (self.kimage_voffset)

    def get_version(self):
        banner_addr = self.address_of('linux_banner')
        if banner_addr is not None:
            banner_addr = self.kernel_virt_to_phys(banner_addr)
            b = self.read_cstring(banner_addr, 256, False)
            if b is None:
                print_out_str('!!! Could not read banner address!')
                return False
            v = re.search('Linux version (\d{0,2}\.\d{0,2}\.\d{0,2})', b)
            if v is None:
                print_out_str('!!! Could not match version! {0}'.format(b))
                return False
            self.version = v.group(1)
            match = re.search('(\d+)\.(\d+)\.(\d+)', self.version)
            if match is not None:
                self.kernel_version = tuple(map(int, match.groups()))
            else:
                print_out_str('!!! Could not extract version info! {0}'.format(self.version))

            print_out_str('Linux Banner: ' + b.rstrip())
            print_out_str('version = {0}'.format(self.version))
            vm_v = self.gdbmi.get_value_of_string('linux_banner')
            if vm_v is None:
                print_out_str('!!! Could not read banner address from vmlinux!')
                return False
            if str(vm_v) in str(b):
                print_out_str("Linux banner from vmlinux = %s" % vm_v)
                print_out_str("Linux banner from dump = %s" % b)
                return True
            else:
                print_out_str("Expected Linux banner = %s" % vm_v)
                print_out_str("But Linux banner got = %s" % b)
                return False
        else:
            print_out_str('!!! Could not lookup banner address')
            return False

    def print_command_line(self):
        command_addr = self.address_of('saved_command_line')
        if command_addr is not None:
            command_addr = self.read_word(command_addr)
            b = self.read_cstring(command_addr, 2048)
            if b is None:
                print_out_str('!!! could not read saved command line address')
                return False
            print_out_str('Command Line: ' + b)
            return True
        else:
            print_out_str('!!! Could not lookup saved command line address')
            return False
        
    def print_socinfo_minidump(self):
        content_socinfo = None
        boards = get_supported_boards()
        for board in boards:
            if self.hw_id == board.board_num:
                content_socinfo = board.ram_start + board.smem_addr_buildinfo
                break
        sernum_offset = self.field_offset('struct socinfo_v10', 'serial_number')
        if sernum_offset is None:
            sernum_offset = self.field_offset('struct socinfo_v0_10', 'serial_number')
            if sernum_offset is None:
                print_out_str("No serial number information available")
                return False
        if content_socinfo:
            addr_of_sernum = content_socinfo + sernum_offset
            serial_number = self.read_u32(addr_of_sernum, False)
            if serial_number is not None:
                print_out_str('Serial number %s' % hex(serial_number))
                return True
            return False

        return False

    def print_socinfo(self):
        content_socinfo = hex(self.read_pointer('socinfo'))
        content_socinfo = content_socinfo.strip('L')

        sernum_offset = self.field_offset('struct socinfo_v10', 'serial_number')
        if sernum_offset is None:
            sernum_offset = self.field_offset('struct socinfo_v0_10', 'serial_number')
            if sernum_offset is None:
                print_out_str("No serial number information available")
                return False
        addr_of_sernum = hex(int(content_socinfo, 16) + sernum_offset)
        addr_of_sernum = addr_of_sernum.strip('L')
        serial_number = self.read_u32(int(addr_of_sernum, 16))
        if serial_number is not None:
            print_out_str('Serial number %s' % hex(serial_number))
            return True

        return False

    def auto_parse(self, file_path):
        for cls in sorted(AutoDumpInfo.__subclasses__(),
                          key=lambda x: x.priority, reverse=True):
            info = cls(file_path)
            info.parse()
            if info is not None and len(info.ebi_files) > 0:
                self.ebi_files = info.ebi_files
                self.phys_offset = self.ebi_files[0][1]
                if self.get_hw_id():
                    for (f, start, end, filename) in self.ebi_files:
                        print_out_str('Adding {0} {1:x}--{2:x}'.format(
                            filename, start, end))
                    return True
        self.ebi_files = None
        return False

    def create_t32_launcher(self):
        out_path = os.path.abspath(self.outdir)

        t32_host_system = self.t32_host_system or platform.system()

        launch_config = open(out_path + '/t32_config.t32', 'wb')
        launch_config.write('OS=\n')
        launch_config.write('ID=T32_1000002\n')
        if t32_host_system != 'Linux':
            launch_config.write('TMP=C:\\TEMP\n')
            launch_config.write('SYS=C:\\T32\n')
            launch_config.write('HELP=C:\\T32\\pdf\n')
        else:
            launch_config.write('TMP=/tmp\n')
            launch_config.write('SYS=/opt/t32\n')
            launch_config.write('HELP=/opt/t32/pdf\n')
        launch_config.write('\n')
        launch_config.write('PBI=SIM\n')
        launch_config.write('\n')
        launch_config.write('SCREEN=\n')
        if t32_host_system != 'Linux':
            launch_config.write('FONT=SMALL\n')
        else:
            launch_config.write('FONT=LARGE\n')
        launch_config.write('HEADER=Trace32-ScorpionSimulator\n')
        launch_config.write('\n')
        if t32_host_system != 'Linux':
            launch_config.write('PRINTER=WINDOWS\n')
        launch_config.write('\n')
        launch_config.write('RCL=NETASSIST\n')
        launch_config.write('PACKLEN=1024\n')
        launch_config.write('PORT=%d\n' % random.randint(20000, 30000))
        launch_config.write('\n')

        launch_config.close()

        startup_script = open(out_path + '/t32_startup_script.cmm', 'wb')

        startup_script.write(('title \"' + out_path + '\"\n').encode('ascii', 'ignore'))

        is_cortex_a53 = self.hw_id in ["8916", "8939", "8936"]

        if self.arm64 and is_cortex_a53:
            startup_script.write('sys.cpu CORTEXA53\n'.encode('ascii', 'ignore'))
        else:
            startup_script.write('sys.cpu {0}\n'.format(self.cpu_type).encode('ascii', 'ignore'))
        startup_script.write('sys.up\n'.encode('ascii', 'ignore'))

        for ram in self.ebi_files:
            ebi_path = os.path.abspath(ram[3])
            startup_script.write('data.load.binary {0} 0x{1:x}\n'.format(
                ebi_path, ram[1]).encode('ascii', 'ignore'))
        if self.minidump:
            dload_ram_elf = 'data.load.elf {} /LOGLOAD /nosymbol\n'.format(os.path.abspath(self.ram_elf_file))
            startup_script.write(dload_ram_elf.encode('ascii', 'ignore'))

        if not self.minidump:
            if self.arm64:
                startup_script.write('Register.Set NS 1\n'.encode('ascii', 'ignore'))
                startup_script.write('Data.Set SPR:0x30201 %Quad 0x{0:x}\n'.format(
                    self.kernel_virt_to_phys(self.swapper_pg_dir_addr))
                    .encode('ascii', 'ignore'))

                if is_cortex_a53:
                    startup_script.write('Data.Set SPR:0x30202 %Quad 0x00000012B5193519\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30A20 %Quad 0x000000FF440C0400\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30A30 %Quad 0x0000000000000000\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30100 %Quad 0x0000000034D5D91D\n'.encode('ascii', 'ignore'))
                else:
                    startup_script.write('Data.Set SPR:0x30202 %Quad 0x00000032B5193519\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30A20 %Quad 0x000000FF440C0400\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30A30 %Quad 0x0000000000000000\n'.encode('ascii', 'ignore'))
                    startup_script.write('Data.Set SPR:0x30100 %Quad 0x0000000004C5D93D\n'.encode('ascii', 'ignore'))

                startup_script.write('Register.Set CPSR 0x3C5\n'.encode('ascii', 'ignore'))