ArmPlatformPkg/Scripts/Ds5/firmware_volume.py

   1 #
   2 #  Copyright (c) 2011-2012, ARM Limited. All rights reserved.
   3 #
   4 #  This program and the accompanying materials
   5 #  are licensed and made available under the terms and conditions of the BSD License
   6 #  which accompanies this distribution.  The full text of the license may be found at
   7 #  http://opensource.org/licenses/bsd-license.php
   8 #
   9 #  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 #  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11 #
  12
  13 from arm_ds.debugger_v1 import DebugException
  14
  15 import struct
  16 import string
  17
  18 import edk2_debugger
  19
  20 class EfiFileSection(object):
  21     EFI_SECTION_PE32                  = 0x10
  22     EFI_SECTION_PIC                   = 0x11
  23     EFI_SECTION_TE                    = 0x12
  24
  25     EFI_IMAGE_DEBUG_TYPE_CODEVIEW     = 0x2
  26
  27     SIZEOF_EFI_FFS_FILE_HEADER        = 0x28
  28
  29     def __init__(self, ec, base):
  30         self.base = base
  31         self.ec = ec
  32
  33     def __str__(self):
  34         return "FileSection(type:0x%X, size:0x%x)" % (self.get_type(), self.get_size())
  35
  36     def get_base(self):
  37         return self.base
  38
  39     def get_type(self):
  40         return struct.unpack("B", self.ec.getMemoryService().read(self.base + 0x3, 1, 8))[0]
  41
  42     def get_size(self):
  43         return (struct.unpack("<I", self.ec.getMemoryService().read(self.base, 4, 32))[0] & 0x00ffffff)
  44
  45     def get_debug_filepath(self):
  46         type = self.get_type()
  47         if type == EfiFileSection.EFI_SECTION_TE:
  48             section = EfiSectionTE(self, ec, self.base + 0x4)
  49         elif type == EfiFileSection.EFI_SECTION_PE32:
  50             section = EfiSectionPE32(self, ec, self.base + 0x4)
  51         else:
  52             raise Exception("EfiFileSection", "No debug section")
  53         return section.get_debug_filepath()
  54
  55 class EfiSectionTE:
  56     SIZEOF_EFI_TE_IMAGE_HEADER        = 0x28
  57     EFI_TE_IMAGE_SIGNATURE            = ('V','Z')
  58
  59     def __init__(self, ec, base_te):
  60         self.ec = ec
  61         self.base_te = int(base_te)
  62         te_sig = struct.unpack("cc", self.ec.getMemoryService().read(self.base_te, 2, 32))
  63         if te_sig != EfiSectionTE.EFI_TE_IMAGE_SIGNATURE:
  64             raise Exception("EfiFileSectionTE","TE Signature incorrect")
  65
  66     def get_debug_filepath(self):
  67         stripped_size = struct.unpack("<H", self.ec.getMemoryService().read(self.base_te + 0x6, 2, 32))[0]
  68         stripped_size -= EfiSectionTE.SIZEOF_EFI_TE_IMAGE_HEADER
  69
  70         debug_dir_entry_rva = self.ec.getMemoryService().readMemory32(self.base_te + 0x20)
  71         if debug_dir_entry_rva == 0:
  72             raise Exception("EfiFileSectionTE","No debug directory for image")
  73         debug_dir_entry_rva -= stripped_size
  74
  75         debug_type = self.ec.getMemoryService().readMemory32(self.base_te + debug_dir_entry_rva + 0xC)
  76         if (debug_type != 0xdf) and (debug_type != EfiFileSection.EFI_IMAGE_DEBUG_TYPE_CODEVIEW):
  77             raise Exception("EfiFileSectionTE","Debug type is not dwarf")
  78
  79         debug_rva = self.ec.getMemoryService().readMemory32(self.base_te + debug_dir_entry_rva + 0x14)
  80         debug_rva -= stripped_size
  81
  82         dwarf_sig = struct.unpack("cccc", self.ec.getMemoryService().read(self.base_te + debug_rva, 4, 32))
  83         if (dwarf_sig != 0x66727764) and (dwarf_sig != FirmwareFile.CONST_NB10_SIGNATURE):
  84             raise Exception("EfiFileSectionTE","Dwarf debug signature not found")
  85
  86         if dwarf_sig == 0x66727764:
  87             filename = self.base_te + debug_rva + 0xc
  88         else:
  89             filename = self.base_te + debug_rva + 0x10
  90         filename = struct.unpack("200s", self.ec.getMemoryService().read(filename, 200, 32))[0]
  91         return filename[0:string.find(filename,'\0')]
  92
  93     def get_debug_elfbase(self):
  94         stripped_size = struct.unpack("<H", self.ec.getMemoryService().read(self.base_te + 0x6, 2, 32))[0]
  95         stripped_size -= EfiSectionTE.SIZEOF_EFI_TE_IMAGE_HEADER
  96
  97         base_of_code = self.ec.getMemoryService().readMemory32(self.base_te + 0xC)
  98
  99         return self.base_te + base_of_code - stripped_size
 100
 101 class EfiSectionPE32:
 102     def __init__(self, ec, base_pe32):
 103         self.ec = ec
 104         self.base_pe32 = base_pe32
 105
 106     def get_debug_filepath(self):
 107         # Offset from dos hdr to PE file hdr
 108         file_header_offset = self.ec.getMemoryService().readMemory32(self.base_pe32 + 0x3C)
 109
 110         # Offset to debug dir in PE hdrs
 111         debug_dir_entry_rva = self.ec.getMemoryService().readMemory32(self.base_pe32 + file_header_offset + 0xA8)
 112         if debug_dir_entry_rva == 0:
 113             raise Exception("EfiFileSectionPE32","No Debug Directory")
 114
 115         debug_type = self.ec.getMemoryService().readMemory32(self.base_pe32 + debug_dir_entry_rva + 0xC)
 116         if (debug_type != 0xdf) and (debug_type != EfiFileSection.EFI_IMAGE_DEBUG_TYPE_CODEVIEW):
 117             raise Exception("EfiFileSectionPE32","Debug type is not dwarf")
 118
 119
 120         debug_rva = self.ec.getMemoryService().readMemory32(self.base_pe32 + debug_dir_entry_rva + 0x14)
 121
 122         dwarf_sig = struct.unpack("cccc", self.ec.getMemoryService().read(str(self.base_pe32 + debug_rva), 4, 32))
 123         if (dwarf_sig != 0x66727764) and (dwarf_sig != FirmwareFile.CONST_NB10_SIGNATURE):
 124             raise Exception("EfiFileSectionPE32","Dwarf debug signature not found")
 125
 126         if dwarf_sig == 0x66727764:
 127             filename = self.base_pe32 + debug_rva + 0xc
 128         else:
 129             filename = self.base_pe32 + debug_rva + 0x10
 130         filename = struct.unpack("200s", self.ec.getMemoryService().read(str(filename), 200, 32))[0]
 131         return filename[0:string.find(filename,'\0')]
 132
 133     def get_debug_elfbase(self):
 134         # Offset from dos hdr to PE file hdr
 135         pe_file_header = self.base_pe32 + self.ec.getMemoryService().readMemory32(self.base_pe32 + 0x3C)
 136
 137         base_of_code = self.base_pe32 + self.ec.getMemoryService().readMemory32(pe_file_header + 0x28)
 138         base_of_data = self.base_pe32 + self.ec.getMemoryService().readMemory32(pe_file_header + 0x2C)
 139
 140         if (base_of_code < base_of_data) and (base_of_code != 0):
 141             return base_of_code
 142         else:
 143             return base_of_data
 144
 145 class FirmwareFile:
 146     EFI_FV_FILETYPE_RAW                   = 0x01
 147     EFI_FV_FILETYPE_FREEFORM              = 0x02
 148     EFI_FV_FILETYPE_SECURITY_CORE         = 0x03
 149     EFI_FV_FILETYPE_PEI_CORE              = 0x04
 150     EFI_FV_FILETYPE_DXE_CORE              = 0x05
 151     EFI_FV_FILETYPE_PEIM                  = 0x06
 152     EFI_FV_FILETYPE_DRIVER                = 0x07
 153     EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER  = 0x08
 154     EFI_FV_FILETYPE_APPLICATION           = 0x09
 155     EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE = 0x0B
 156     EFI_FV_FILETYPE_FFS_MIN               = 0xF0
 157
 158     CONST_NB10_SIGNATURE = ('N','B','1','0')
 159
 160     def __init__(self, fv, base, ec):
 161         self.fv = fv
 162         self.base = base
 163         self.ec = ec
 164
 165     def __str__(self):
 166         return "FFS(state:0x%x, type:0x%X, size:0x%x)" % (self.get_state(), self.get_type(), self.get_size())
 167
 168     def get_base(self):
 169         return self.base
 170
 171     def get_size(self):
 172         size = (self.ec.getMemoryService().readMemory32(self.base + 0x14) & 0x00ffffff)
 173
 174         # Occupied size is the size considering the alignment
 175         return size + ((0x8 - (size & 0x7)) & 0x7)
 176
 177     def get_type(self):
 178         return self.ec.getMemoryService().readMemory8(self.base + 0x12)
 179
 180     def get_state(self):
 181         state = self.ec.getMemoryService().readMemory8(self.base + 0x17)
 182
 183         polarity = self.fv.get_polarity()
 184         if polarity:
 185             state = ~state
 186
 187         highest_bit = 0x80;
 188         while (highest_bit != 0) and ((highest_bit & state) == 0):
 189             highest_bit >>= 1
 190
 191         return highest_bit
 192
 193     def get_next_section(self, section=None):
 194         if section == None:
 195             if self.get_type() != FirmwareFile.EFI_FV_FILETYPE_FFS_MIN:
 196                 section_base = self.get_base() + 0x18;
 197             else:
 198                 return None
 199         else:
 200             section_base = int(section.get_base() + section.get_size())
 201
 202             # Align to next 4 byte boundary
 203             if (section_base & 0x3) != 0:
 204                 section_base = section_base + 0x4 - (section_base & 0x3)
 205
 206         if section_base < self.get_base() + self.get_size():
 207             return EfiFileSection(self.ec, section_base)
 208         else:
 209             return None
 210
 211 class FirmwareVolume:
 212     CONST_FV_SIGNATURE = ('_','F','V','H')
 213     EFI_FVB2_ERASE_POLARITY = 0x800
 214
 215     DebugInfos = []
 216
 217     def __init__(self, ec, fv_base, fv_size):
 218         self.ec = ec
 219         self.fv_base = fv_base
 220         self.fv_size = fv_size
 221
 222         try:
 223             signature = struct.unpack("cccc", self.ec.getMemoryService().read(fv_base + 0x28, 4, 32))
 224         except DebugException:
 225             raise Exception("FirmwareVolume", "Not possible to access the defined firmware volume at [0x%X,0x%X]. Could be the used build report does not correspond to your current debugging context." % (int(fv_base),int(fv_base+fv_size)))
 226         if signature != FirmwareVolume.CONST_FV_SIGNATURE:
 227             raise Exception("FirmwareVolume", "This is not a valid firmware volume")
 228
 229     def get_size(self):
 230         return self.ec.getMemoryService().readMemory32(self.fv_base + 0x20)
 231
 232     def get_attributes(self):
 233         return self.ec.getMemoryService().readMemory32(self.fv_base + 0x2C)
 234
 235     def get_polarity(self):
 236         attributes = self.get_attributes()
 237         if attributes & FirmwareVolume.EFI_FVB2_ERASE_POLARITY:
 238             return 1
 239         else:
 240             return 0
 241
 242     def get_next_ffs(self, ffs=None):
 243         if ffs == None:
 244             # Get the offset of the first FFS file from the FV header
 245             ffs_base = self.fv_base +  self.ec.getMemoryService().readMemory16(self.fv_base + 0x30)
 246         else:
 247             # Goto the next FFS file
 248             ffs_base = int(ffs.get_base() + ffs.get_size())
 249
 250             # Align to next 8 byte boundary
 251             if (ffs_base & 0x7) != 0:
 252                 ffs_base = ffs_base + 0x8 - (ffs_base & 0x7)
 253
 254         if ffs_base < self.fv_base + self.get_size():
 255             return FirmwareFile(self, ffs_base, self.ec)
 256         else:
 257             return None
 258
 259     def get_debug_info(self):
 260         self.DebugInfos = []
 261
 262         ffs = self.get_next_ffs()
 263         while ffs != None:
 264             section = ffs.get_next_section()
 265             while section != None:
 266                 type = section.get_type()
 267                 if (type == EfiFileSection.EFI_SECTION_TE) or (type == EfiFileSection.EFI_SECTION_PE32):
 268                     self.DebugInfos.append((section.get_base(), section.get_size(), section.get_type()))
 269                 section = ffs.get_next_section(section)
 270             ffs = self.get_next_ffs(ffs)
 271
 272     def load_symbols_at(self, addr):
 273         if self.DebugInfos == []:
 274             self.get_debug_info()
 275
 276         for debug_info in self.DebugInfos:
 277             if (addr >= debug_info[0]) and (addr < debug_info[0] + debug_info[1]):
 278                 if debug_info[2] == EfiFileSection.EFI_SECTION_TE:
 279                     section = EfiSectionTE(self.ec, debug_info[0] + 0x4)
 280                 elif debug_info[2] == EfiFileSection.EFI_SECTION_PE32:
 281                     section = EfiSectionPE32(self.ec, debug_info[0] + 0x4)
 282                 else:
 283                     raise Exception('FirmwareVolume','Section Type not supported')
 284
 285                 edk2_debugger.load_symbol_from_file(self.ec, section.get_debug_filepath(), section.get_debug_elfbase())
 286
 287                 return debug_info
 288
 289     def load_all_symbols(self):
 290         if self.DebugInfos == []:
 291             self.get_debug_info()
 292
 293         for debug_info in self.DebugInfos:
 294             if debug_info[2] == EfiFileSection.EFI_SECTION_TE:
 295                 section = EfiSectionTE(self.ec, debug_info[0] + 0x4)
 296             elif debug_info[2] == EfiFileSection.EFI_SECTION_PE32:
 297                 section = EfiSectionPE32(self.ec, debug_info[0] + 0x4)
 298             else:
 299                 continue
 300
 301             edk2_debugger.load_symbol_from_file(self.ec, section.get_debug_filepath(), section.get_debug_elfbase())