elf_mem_map: reduce some duplication
This commit is contained in:
Yuri D'Elia
DRracer
parent
c875aef49c
commit
d1720cba51
1 changed files with 78 additions and 70 deletions
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@ -70,6 +70,82 @@ def get_FORM_block1(attr):
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return v
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return None
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def get_array_dims(DIE):
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array_DIE = get_type_def(DIE, 'DW_TAG_array_type')
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if array_DIE is None:
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return []
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array_dim = []
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for range_DIE in array_DIE.iter_children():
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if range_DIE.tag == 'DW_TAG_subrange_type' and \
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'DW_AT_upper_bound' in range_DIE.attributes:
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array_dim.append(range_DIE.attributes['DW_AT_upper_bound'].value + 1)
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return array_dim
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def get_struct_members(DIE, size, expand_structs, struct_gaps):
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if not expand_structs or size[0].tag == 'DW_TAG_pointer_type':
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return []
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struct_DIE = get_type_def(DIE, 'DW_TAG_structure_type')
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if struct_DIE is None:
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return []
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members = []
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for member_DIE in struct_DIE.iter_children():
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if member_DIE.tag == 'DW_TAG_member' and 'DW_AT_name' in member_DIE.attributes:
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m_name = member_DIE.attributes['DW_AT_name'].value.decode('ascii')
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m_off = get_FORM_block1(member_DIE.attributes['DW_AT_data_member_location'])
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m_byte_size = get_type_size(member_DIE)[1]
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# still expand member arrays
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m_array_dim = get_array_dims(member_DIE)
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if m_byte_size == 1 and len(m_array_dim) > 1:
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# likely string, remove one dimension
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m_byte_size *= m_array_dim.pop()
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if len(m_array_dim) == 0 or (len(m_array_dim) == 1 and m_array_dim[0] == 1):
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# plain entry
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members.append(Member(m_name, m_off, m_byte_size))
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elif len(m_array_dim) == 1 and m_byte_size == 1:
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# likely string, avoid expansion
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members.append(Member(m_name + '[]', m_off, m_array_dim[0]))
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else:
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# expand array entries
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m_array_pos = m_off
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m_array_loc = [0] * len(m_array_dim)
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while True:
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# location index
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sfx = ''
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for d in range(len(m_array_dim)):
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sfx += '[{}]'.format(str(m_array_loc[d]).rjust(len(str(m_array_dim[d]-1)), '0'))
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members.append(Member(m_name + sfx, m_array_pos, m_byte_size))
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# advance
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if array_inc(m_array_loc, m_array_dim):
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break
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m_array_pos += m_byte_size
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if struct_gaps and len(members):
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# fill gaps in the middle
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members = list(sorted(members, key=lambda x: x.off))
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last_end = 0
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for n in range(len(members)):
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member = members[n]
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if member.off > last_end:
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members.append(Member('*UNKNOWN*', last_end, member.off - last_end))
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last_end = member.off + member.size
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if struct_gaps and len(members):
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# fill gap at the end
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members = list(sorted(members, key=lambda x: x.off))
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last = members[-1]
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last_end = last.off + last.size
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if size[1] > last_end:
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members.append(Member('*UNKNOWN*', last_end, byte_size - last_end))
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return members
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def get_elf_globals(path, expand_structs, struct_gaps=True):
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fd = open(path, "rb")
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if fd is None:
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@ -121,78 +197,10 @@ def get_elf_globals(path, expand_structs, struct_gaps=True):
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byte_size = size[1]
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# fetch array dimensions (if known)
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array_dim = []
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array_DIE = get_type_def(DIE, 'DW_TAG_array_type')
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if array_DIE is not None:
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for range_DIE in array_DIE.iter_children():
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if range_DIE.tag == 'DW_TAG_subrange_type' and \
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'DW_AT_upper_bound' in range_DIE.attributes:
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array_dim.append(range_DIE.attributes['DW_AT_upper_bound'].value + 1)
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array_dim = get_array_dims(DIE)
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# fetch structure members (one level only)
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members = []
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if expand_structs and size[0].tag != 'DW_TAG_pointer_type':
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struct_DIE = get_type_def(DIE, 'DW_TAG_structure_type')
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if struct_DIE is not None:
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for member_DIE in struct_DIE.iter_children():
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if member_DIE.tag == 'DW_TAG_member' and 'DW_AT_name' in member_DIE.attributes:
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m_name = member_DIE.attributes['DW_AT_name'].value.decode('ascii')
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m_off = get_FORM_block1(member_DIE.attributes['DW_AT_data_member_location'])
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m_byte_size = get_type_size(member_DIE)[1]
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# still expand member arrays
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m_array_dim = []
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m_array_DIE = get_type_def(member_DIE, 'DW_TAG_array_type')
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if m_array_DIE is not None:
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for range_DIE in m_array_DIE.iter_children():
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if range_DIE.tag == 'DW_TAG_subrange_type' and \
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'DW_AT_upper_bound' in range_DIE.attributes:
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m_array_dim.append(range_DIE.attributes['DW_AT_upper_bound'].value + 1)
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if m_byte_size == 1 and len(m_array_dim) > 1:
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# likely string, remove one dimension
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m_byte_size *= m_array_dim.pop()
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if len(m_array_dim) == 0 or (len(m_array_dim) == 1 and m_array_dim[0] == 1):
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# plain entry
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members.append(Member(m_name, m_off, m_byte_size))
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elif len(m_array_dim) == 1 and m_byte_size == 1:
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# likely string, avoid expansion
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members.append(Member(m_name + '[]', m_off, m_array_dim[0]))
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else:
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# expand array entries
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m_array_pos = m_off
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m_array_loc = [0] * len(m_array_dim)
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while True:
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# location index
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sfx = ''
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for d in range(len(m_array_dim)):
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sfx += '[{}]'.format(str(m_array_loc[d]).rjust(len(str(m_array_dim[d]-1)), '0'))
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members.append(Member(m_name + sfx, m_array_pos, m_byte_size))
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# advance
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if array_inc(m_array_loc, m_array_dim):
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break
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m_array_pos += m_byte_size
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if struct_gaps and len(members):
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# fill gaps in the middle
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members = list(sorted(members, key=lambda x: x.off))
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last_end = 0
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for n in range(len(members)):
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member = members[n]
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if member.off > last_end:
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members.append(Member('*UNKNOWN*', last_end, member.off - last_end))
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last_end = member.off + member.size
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if struct_gaps and len(members):
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# fill gap at the end
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members = list(sorted(members, key=lambda x: x.off))
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last = members[-1]
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last_end = last.off + last.size
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if byte_size > last_end:
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members.append(Member('*UNKNOWN*', last_end, byte_size - last_end))
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members = get_struct_members(DIE, size, expand_structs, struct_gaps)
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def expand_members(entry, members):
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if len(members) == 0:
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