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#
# Copyright (c) 2011-2012, ARM Limited. All rights reserved.
#
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
from arm_ds.debugger_v1 import DebugException
import struct
import string
import edk2_debugger
class EfiFileSection(object):
EFI_SECTION_PE32 = 0x10
EFI_SECTION_PIC = 0x11
EFI_SECTION_TE = 0x12
EFI_IMAGE_DEBUG_TYPE_CODEVIEW = 0x2
SIZEOF_EFI_FFS_FILE_HEADER = 0x28
def __init__(self, ec, base):
self.base = base
self.ec = ec
def __str__(self):
return "FileSection(type:0x%X, size:0x%x)" % (self.get_type(), self.get_size())
def get_base(self):
return self.base
def get_type(self):
return struct.unpack("B", self.ec.getMemoryService().read(self.base + 0x3, 1, 8))[0]
def get_size(self):
return (struct.unpack("<I", self.ec.getMemoryService().read(self.base, 4, 32))[0] & 0x00ffffff)
def get_debug_filepath(self):
type = self.get_type()
if type == EfiFileSection.EFI_SECTION_TE:
section = EfiSectionTE(self, ec, self.base + 0x4)
elif type == EfiFileSection.EFI_SECTION_PE32:
section = EfiSectionPE32(self, ec, self.base + 0x4)
else:
raise Exception("EfiFileSection", "No debug section")
return section.get_debug_filepath()
class EfiSectionTE:
SIZEOF_EFI_TE_IMAGE_HEADER = 0x28
EFI_TE_IMAGE_SIGNATURE = ('V','Z')
def __init__(self, ec, base_te):
self.ec = ec
self.base_te = int(base_te)
te_sig = struct.unpack("cc", self.ec.getMemoryService().read(self.base_te, 2, 32))
if te_sig != EfiSectionTE.EFI_TE_IMAGE_SIGNATURE:
raise Exception("EfiFileSectionTE","TE Signature incorrect")
def get_debug_filepath(self):
stripped_size = struct.unpack("<H", self.ec.getMemoryService().read(self.base_te + 0x6, 2, 32))[0]
stripped_size -= EfiSectionTE.SIZEOF_EFI_TE_IMAGE_HEADER
debug_dir_entry_rva = self.ec.getMemoryService().readMemory32(self.base_te + 0x20)
if debug_dir_entry_rva == 0:
raise Exception("EfiFileSectionTE","No debug directory for image")
debug_dir_entry_rva -= stripped_size
debug_type = self.ec.getMemoryService().readMemory32(self.base_te + debug_dir_entry_rva + 0xC)
if (debug_type != 0xdf) and (debug_type != EfiFileSection.EFI_IMAGE_DEBUG_TYPE_CODEVIEW):
raise Exception("EfiFileSectionTE","Debug type is not dwarf")
debug_rva = self.ec.getMemoryService().readMemory32(self.base_te + debug_dir_entry_rva + 0x14)
debug_rva -= stripped_size
dwarf_sig = struct.unpack("cccc", self.ec.getMemoryService().read(self.base_te + debug_rva, 4, 32))
if (dwarf_sig != 0x66727764) and (dwarf_sig != FirmwareFile.CONST_NB10_SIGNATURE):
raise Exception("EfiFileSectionTE","Dwarf debug signature not found")
if dwarf_sig == 0x66727764:
filename = self.base_te + debug_rva + 0xc
else:
filename = self.base_te + debug_rva + 0x10
filename = struct.unpack("200s", self.ec.getMemoryService().read(filename, 200, 32))[0]
return filename[0:string.find(filename,'\0')]
def get_debug_elfbase(self):
stripped_size = struct.unpack("<H", self.ec.getMemoryService().read(self.base_te + 0x6, 2, 32))[0]
stripped_size -= EfiSectionTE.SIZEOF_EFI_TE_IMAGE_HEADER
base_of_code = self.ec.getMemoryService().readMemory32(self.base_te + 0xC)
return self.base_te + base_of_code - stripped_size
class EfiSectionPE32:
def __init__(self, ec, base_pe32):
self.ec = ec
self.base_pe32 = base_pe32
def get_debug_filepath(self):
# Offset from dos hdr to PE file hdr
file_header_offset = self.ec.getMemoryService().readMemory32(self.base_pe32 + 0x3C)
# Offset to debug dir in PE hdrs
debug_dir_entry_rva = self.ec.getMemoryService().readMemory32(self.base_pe32 + file_header_offset + 0xA8)
if debug_dir_entry_rva == 0:
raise Exception("EfiFileSectionPE32","No Debug Directory")
debug_type = self.ec.getMemoryService().readMemory32(self.base_pe32 + debug_dir_entry_rva + 0xC)
if (debug_type != 0xdf) and (debug_type != EfiFileSection.EFI_IMAGE_DEBUG_TYPE_CODEVIEW):
raise Exception("EfiFileSectionPE32","Debug type is not dwarf")
debug_rva = self.ec.getMemoryService().readMemory32(self.base_pe32 + debug_dir_entry_rva + 0x14)
dwarf_sig = struct.unpack("cccc", self.ec.getMemoryService().read(str(self.base_pe32 + debug_rva), 4, 32))
if (dwarf_sig != 0x66727764) and (dwarf_sig != FirmwareFile.CONST_NB10_SIGNATURE):
raise Exception("EfiFileSectionPE32","Dwarf debug signature not found")
if dwarf_sig == 0x66727764:
filename = self.base_pe32 + debug_rva + 0xc
else:
filename = self.base_pe32 + debug_rva + 0x10
filename = struct.unpack("200s", self.ec.getMemoryService().read(str(filename), 200, 32))[0]
return filename[0:string.find(filename,'\0')]
def get_debug_elfbase(self):
# Offset from dos hdr to PE file hdr
pe_file_header = self.base_pe32 + self.ec.getMemoryService().readMemory32(self.base_pe32 + 0x3C)
base_of_code = self.base_pe32 + self.ec.getMemoryService().readMemory32(pe_file_header + 0x28)
base_of_data = self.base_pe32 + self.ec.getMemoryService().readMemory32(pe_file_header + 0x2C)
if (base_of_code < base_of_data) and (base_of_code != 0):
return base_of_code
else:
return base_of_data
class FirmwareFile:
EFI_FV_FILETYPE_RAW = 0x01
EFI_FV_FILETYPE_FREEFORM = 0x02
EFI_FV_FILETYPE_SECURITY_CORE = 0x03
EFI_FV_FILETYPE_PEI_CORE = 0x04
EFI_FV_FILETYPE_DXE_CORE = 0x05
EFI_FV_FILETYPE_PEIM = 0x06
EFI_FV_FILETYPE_DRIVER = 0x07
EFI_FV_FILETYPE_COMBINED_PEIM_DRIVER = 0x08
EFI_FV_FILETYPE_APPLICATION = 0x09
EFI_FV_FILETYPE_FIRMWARE_VOLUME_IMAGE = 0x0B
EFI_FV_FILETYPE_FFS_MIN = 0xF0
CONST_NB10_SIGNATURE = ('N','B','1','0')
def __init__(self, fv, base, ec):
self.fv = fv
self.base = base
self.ec = ec
def __str__(self):
return "FFS(state:0x%x, type:0x%X, size:0x%x)" % (self.get_state(), self.get_type(), self.get_size())
def get_base(self):
return self.base
def get_size(self):
size = (self.ec.getMemoryService().readMemory32(self.base + 0x14) & 0x00ffffff)
# Occupied size is the size considering the alignment
return size + ((0x8 - (size & 0x7)) & 0x7)
def get_type(self):
return self.ec.getMemoryService().readMemory8(self.base + 0x12)
def get_state(self):
state = self.ec.getMemoryService().readMemory8(self.base + 0x17)
polarity = self.fv.get_polarity()
if polarity:
state = ~state
highest_bit = 0x80;
while (highest_bit != 0) and ((highest_bit & state) == 0):
highest_bit >>= 1
return highest_bit
def get_next_section(self, section=None):
if section == None:
if self.get_type() != FirmwareFile.EFI_FV_FILETYPE_FFS_MIN:
section_base = self.get_base() + 0x18;
else:
return None
else:
section_base = int(section.get_base() + section.get_size())
# Align to next 4 byte boundary
if (section_base & 0x3) != 0:
section_base = section_base + 0x4 - (section_base & 0x3)
if section_base < self.get_base() + self.get_size():
return EfiFileSection(self.ec, section_base)
else:
return None
class FirmwareVolume:
CONST_FV_SIGNATURE = ('_','F','V','H')
EFI_FVB2_ERASE_POLARITY = 0x800
DebugInfos = []
def __init__(self, ec, fv_base, fv_size):
self.ec = ec
self.fv_base = fv_base
self.fv_size = fv_size
try:
signature = struct.unpack("cccc", self.ec.getMemoryService().read(fv_base + 0x28, 4, 32))
except DebugException:
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)))
if signature != FirmwareVolume.CONST_FV_SIGNATURE:
raise Exception("FirmwareVolume", "This is not a valid firmware volume")
def get_size(self):
return self.ec.getMemoryService().readMemory32(self.fv_base + 0x20)
def get_attributes(self):
return self.ec.getMemoryService().readMemory32(self.fv_base + 0x2C)
def get_polarity(self):
attributes = self.get_attributes()
if attributes & FirmwareVolume.EFI_FVB2_ERASE_POLARITY:
return 1
else:
return 0
def get_next_ffs(self, ffs=None):
if ffs == None:
# Get the offset of the first FFS file from the FV header
ffs_base = self.fv_base + self.ec.getMemoryService().readMemory16(self.fv_base + 0x30)
else:
# Goto the next FFS file
ffs_base = int(ffs.get_base() + ffs.get_size())
# Align to next 8 byte boundary
if (ffs_base & 0x7) != 0:
ffs_base = ffs_base + 0x8 - (ffs_base & 0x7)
if ffs_base < self.fv_base + self.get_size():
return FirmwareFile(self, ffs_base, self.ec)
else:
return None
def get_debug_info(self):
self.DebugInfos = []
ffs = self.get_next_ffs()
while ffs != None:
section = ffs.get_next_section()
while section != None:
type = section.get_type()
if (type == EfiFileSection.EFI_SECTION_TE) or (type == EfiFileSection.EFI_SECTION_PE32):
self.DebugInfos.append((section.get_base(), section.get_size(), section.get_type()))
section = ffs.get_next_section(section)
ffs = self.get_next_ffs(ffs)
def load_symbols_at(self, addr):
if self.DebugInfos == []:
self.get_debug_info()
for debug_info in self.DebugInfos:
if (addr >= debug_info[0]) and (addr < debug_info[0] + debug_info[1]):
if debug_info[2] == EfiFileSection.EFI_SECTION_TE:
section = EfiSectionTE(self.ec, debug_info[0] + 0x4)
elif debug_info[2] == EfiFileSection.EFI_SECTION_PE32:
section = EfiSectionPE32(self.ec, debug_info[0] + 0x4)
else:
raise Exception('FirmwareVolume','Section Type not supported')
edk2_debugger.load_symbol_from_file(self.ec, section.get_debug_filepath(), section.get_debug_elfbase())
return debug_info
def load_all_symbols(self):
if self.DebugInfos == []:
self.get_debug_info()
for debug_info in self.DebugInfos:
if debug_info[2] == EfiFileSection.EFI_SECTION_TE:
section = EfiSectionTE(self.ec, debug_info[0] + 0x4)
elif debug_info[2] == EfiFileSection.EFI_SECTION_PE32:
section = EfiSectionPE32(self.ec, debug_info[0] + 0x4)
else:
continue
edk2_debugger.load_symbol_from_file(self.ec, section.get_debug_filepath(), section.get_debug_elfbase())
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