##
import sys
+import struct
import parseelf
+class searcher:
+
+ def reset(this, offs=0):
+ if offs < 0 or offs > this.length:
+ raise Exception('Reset past end of section')
+ this.address = this.baseaddr + offs
+ this.offset = offs
+
+ def skip(this, cnt):
+ if this.offset + cnt > this.length:
+ raise Exception('Skip past end of section')
+ this.address += cnt
+ this.offset += cnt
+
+ def peek(this, cnt, offs=0):
+ if this.offset + offs + cnt > this.length:
+ raise Exception('Peek past end of section')
+ return this.data[this.offset + offs : this.offset + offs + cnt]
+
+ def look_for(this, needle):
+ pos = this.data.find(needle, this.offset)
+ if pos < 0:
+ raise Exception('Needle not found in haystack')
+ this.skip(pos - this.offset)
+
+ def look_for_either(this, needle1, needle2):
+ pos1 = this.data.find(needle1, this.offset)
+ pos2 = this.data.find(needle2, this.offset)
+ if pos1 < 0 and pos2 < 0:
+ raise Exception('Needle not found in haystack')
+ if pos1 < 0 or pos2 < pos1:
+ pos1 = pos2
+ this.skip(pos1 - this.offset)
+
+ def __init__(this, data, addr):
+ this.data = data
+ this.baseaddr = addr
+ this.length = len(data)
+ this.reset()
+
+def search_plt_32(plt, addr):
+ plt.reset()
+ plt.look_for(struct.pack('<BBI', 0xff, 0x25, addr)) # jmp *addr32
+ return plt.address
+
+def search_plt_64(plt, addr):
+ plt.reset()
+ while True:
+ plt.look_for(b'\xff\x25') # jmpq *offs32(%rip)
+ offs = struct.unpack('<i', plt.peek(4, 2))[0]
+ if plt.address + offs + 6 == addr:
+ return plt.address
+ plt.skip(2)
+
+def find_hex_file_lines_constructor_32(text, hex_file_lines_got, got_plt):
+ while True:
+ text.look_for_either(b'\x8b\xbb', b'\x8b\xb3') # mov offs32(%ebx),{%edi,%esi}
+ offs = struct.unpack('<i', text.peek(4, 2))[0]
+ if got_plt + offs == hex_file_lines_got:
+ text.skip(6)
+ return
+ text.skip(2)
+
+def find_hex_file_lines_constructor_64(text, hex_file_lines_got):
+ while True:
+ text.look_for(b'\x48\x8b\x2d') # mov offs32(%rip),%rbp
+ offs = struct.unpack('<i', text.peek(4, 3))[0]
+ if text.address + offs + 7 == hex_file_lines_got:
+ text.skip(7)
+ return
+ text.skip(3)
+
+def parse_hex_file_lines_constructor_32(text, basic_string_plt, got_plt, lines):
+ text.skip(-5)
+ esi = (text.peek(1) == b'\xb3')
+ text.skip(5)
+ cnt = len(lines)
+ while cnt > 0:
+ if text.peek(2) == b'\x8d\x45': # lea offs8(%ebp),%eax
+ text.skip(3)
+ elif text.peek(2) == b'\x8d\x85': # lea offs32(%ebp),%eax
+ text.skip(6)
+ if text.peek(1) == (b'\xbf' if esi else b'\xbe'): # mov $imm32,%esi
+ text.skip(5)
+ elif text.peek(2) == (b'\x31\xff' if esi else b'\x31\xf6'): # xor %esi,%esi
+ text.skip(2)
+ if text.peek(4) == b'\x89\x44\x24\x08': # mov %eax,0x8(%esp)
+ text.skip(4)
+ if text.peek(2) == b'\x8d\x83': # lea offs32(%ebx),%eax
+ straddr = struct.unpack('<i', text.peek(4, 2))[0]
+ text.skip(6)
+ straddr += got_plt
+ else:
+ raise Exception('Expected lea offs32(%ebx),%eax @ ' +
+ ('0x%x' % text.address))
+ if text.peek(4) == b'\x89\x44\x24\x04': # mov %eax,0x4(%esp)
+ text.skip(4)
+ if text.peek(3) == (b'\x89\x34\x24' if esi else b'\x89\x3c\x24'): # mov %edi,(%esp)
+ offs = 0
+ text.skip(3)
+ elif text.peek(2) == (b'\x8d\x46' if esi else b'\x8d\x47'): # lea offs8(%edi),%eax
+ offs = struct.unpack('<b', text.peek(1, 2))[0]
+ text.skip(3)
+ elif text.peek(2) == (b'\x8d\x86' if esi else b'\x8d\x87'): # lea offs32(%edi),%eax
+ offs = struct.unpack('<i', text.peek(4, 2))[0]
+ text.skip(6)
+ else:
+ raise Exception('Expected lea offs(%e'+('s' if esi else 'd')+'i),%eax @ ' +
+ ('0x%x' % text.address))
+ if offs < 0 or offs > (len(lines) << 2) or (offs & 3) != 0:
+ raise Exception('Invalid offset %d' % offs)
+ index = offs >> 2
+ if lines[index] != 0:
+ raise Exception('Line %d filled multiple times' % index)
+ if text.peek(3) == b'\x89\x04\x24': # mov %eax,(%esp)
+ text.skip(3)
+ if text.peek(1) == b'\xe8': # call offs32
+ offs = struct.unpack('<i', text.peek(4, 1))[0]
+ text.skip(5)
+ if text.address + offs != basic_string_plt:
+ raise Exception('Expected call ZNSsC1EPKcRKSaIcE@plt @ ' +
+ ('0x%x' % text.address))
+ else:
+ raise Exception('Expected call ZNSsC1EPKcRKSaIcE@plt @ ' +
+ ('0x%x' % text.address))
+ if straddr == 0:
+ raise Exception('NULL pointer stored to index %d' % index)
+ lines[index] = straddr
+ cnt -= 1
+
+def parse_hex_file_lines_constructor_64(text, basic_string_plt, lines):
+ cnt = len(lines)
+ while cnt > 0:
+ if text.peek(1) == b'\xbb': # mov $imm32,%ebx
+ text.skip(5)
+ elif text.peek(2) == b'\x31\xdb': # xor %ebx,%ebx
+ text.skip(2)
+ if text.peek(4) == b'\x48\x8d\x54\x24': # lea offs8(%rsp),%rdx
+ text.skip(5)
+ elif text.peek(4) == b'\x48\x8d\x94\x24': # lea offs32(%rsp),%rdx
+ text.skip(8)
+ if text.peek(3) == b'\x48\x8d\x35': # lea offs32(%rip),%rsi
+ straddr = struct.unpack('<i', text.peek(4, 3))[0]
+ text.skip(7)
+ straddr += text.address
+ else:
+ raise Exception('Expected lea offs(%rip),%rsi @ ' +
+ ('0x%x' % text.address))
+ if text.peek(3) == b'\x48\x89\xef': # mov %rbp,%rdi
+ offs = 0
+ text.skip(3)
+ elif text.peek(3) == b'\x48\x8d\x7d': # lea offs8(%rbp),%rdi
+ offs = struct.unpack('<b', text.peek(1, 3))[0]
+ text.skip(4)
+ elif text.peek(3) == b'\x48\x8d\xbd': # lea offs32(%rbp),%rdi
+ offs = struct.unpack('<i', text.peek(4, 3))[0]
+ text.skip(7)
+ else:
+ raise Exception('Expected lea offs(%rbp),%rdi @ ' +
+ ('0x%x' % text.address))
+ if text.peek(1) == b'\xbb': # mov $imm32,%ebx
+ text.skip(5)
+ elif text.peek(2) == b'\x31\xdb': # xor %ebx,%ebx
+ text.skip(2)
+ if offs < 0 or offs > (len(lines) << 3) or (offs & 7) != 0:
+ raise Exception('Invalid offset %d' % offs)
+ index = offs >> 3
+ if lines[index] != 0:
+ raise Exception('Line %d filled multiple times' % index)
+ if text.peek(1) == b'\xe8': # callq offs32
+ offs = struct.unpack('<i', text.peek(4, 1))[0]
+ text.skip(5)
+ if text.address + offs != basic_string_plt:
+ raise Exception('Expected callq ZNSsC1EPKcRKSaIcE@plt @ ' +
+ ('0x%x' % text.address))
+ else:
+ raise Exception('Expected callq ZNSsC1EPKcRKSaIcE@plt @ ' +
+ ('0x%x' % text.address))
+ if straddr == 0:
+ raise Exception('NULL pointer stored to index %d' % index)
+ lines[index] = straddr
+ cnt -= 1
+
+def find_reloc(elf, symname):
+ for section, relocs in elf.relocs.items():
+ if 'symbols' in relocs and symname in relocs['symbols']:
+ symnum = relocs['symbols'][symname]['number']
+ for reloc in relocs['relocs']:
+ if reloc['r_sym'] == symnum:
+ return reloc
+ raise Exception('Unable to find a relocation against ' + symname)
+
+def ihex_to_binary(lines):
+ chunks = {}
+ for line in lines:
+ if line[0] != ':':
+ raise Exception('ihex line does not start with ":"')
+ line = bytes.fromhex(line[1:])
+ if (sum(bytearray(line)) & 0xff) != 0:
+ raise Exception('Invalid checksum in ihex')
+ (byte_count, address, rectype) = struct.unpack('>BHB', line[:4])
+ (data, checksum) = struct.unpack('>%dsB' % (byte_count), line[4:])
+ if rectype == 1 and byte_count == 0:
+ pass
+ elif rectype != 0 or byte_count == 0:
+ raise Exception('Unexpected rectype %d with bytecount %d' %
+ (rectype, byte_count))
+ elif address in chunks:
+ raise Exception('Multiple ihex lines with address 0x%x' % address)
+ else:
+ chunks[address] = data
+ blob = b''
+ for address in sorted(iter(chunks)):
+ if address < len(blob):
+ raise Exception('Overlapping ihex chunks')
+ elif address > len(blob):
+ blob += b'\x00' * (address - len(blob))
+ blob += chunks[address]
+ return blob
+
+def extract_fx2_firmware(elf, symname, filename):
+ blob = elf.load_symbol(elf.dynsym[symname + 'Count'])
+ count = struct.unpack('<I', blob)[0]
+ got_plt = elf.find_section('.got.plt')['sh_addr']
+ hex_file_lines_got = find_reloc(elf, symname)['r_offset']
+ basic_string_got = find_reloc(elf, '_ZNSsC1EPKcRKSaIcE')['r_offset']
+ pltsec = elf.find_section('.plt')
+ plt = searcher(elf.read_section(pltsec), pltsec['sh_addr'])
+ try:
+ if elf.elf_wordsize == 64:
+ basic_string_plt = search_plt_64(plt, basic_string_got)
+ else:
+ basic_string_plt = search_plt_32(plt, basic_string_got)
+ except:
+ raise Exception('Unable to find a PLT entry for _ZNSsC1EPKcRKSaIcE')
+ textsec = elf.find_section('.text')
+ text = searcher(elf.read_section(textsec), textsec['sh_addr'])
+ while True:
+ try:
+ if elf.elf_wordsize == 64:
+ find_hex_file_lines_constructor_64(text, hex_file_lines_got)
+ else:
+ find_hex_file_lines_constructor_32(text, hex_file_lines_got,
+ got_plt)
+ except:
+ raise Exception('Unable to find constructor for ' + symname)
+ oldoffs = text.offset
+ l = [0]*count
+ try:
+ if elf.elf_wordsize == 64:
+ parse_hex_file_lines_constructor_64(text, basic_string_plt, l)
+ else:
+ parse_hex_file_lines_constructor_32(text, basic_string_plt,
+ got_plt, l)
+ break
+ except KeyError:
+ text.reset(oldoffs)
+ rodatasec = elf.find_section('.rodata')
+ rodata = elf.read_section(rodatasec)
+ lo = rodatasec['sh_addr']
+ hi = lo + rodatasec['sh_size']
+ for i in range(count):
+ addr = l[i]
+ if addr < lo or addr >= hi:
+ raise Exception('Address 0x%x outside of .rodata section' % addr)
+ l[i] = elf.get_name(addr - lo, rodata)
+ blob = ihex_to_binary(l)
+ f = open(filename, 'wb')
+ f.write(blob)
+ f.close()
+ print("saved %d bytes to %s" % (len(blob), filename))
+
+def extract_fx2_firmware_single(elf, symname, filename):
+ if not symname in elf.dynsym:
+ return False
+ hex = bytes.decode(elf.load_symbol(elf.dynsym[symname]))
+ if hex[-1] == '\0':
+ hex = hex[:-1]
+ blob = ihex_to_binary(hex.split(';'))
+ f = open(filename, 'wb')
+ f.write(blob)
+ f.close()
+ print("saved %d bytes to %s" % (len(blob), filename))
+ return True
+
+def extract_fx3_firmware(elf, symname, filename):
+ index = 0
+ blobs = []
+ while True:
+ sym = elf.dynsym.get(symname + '_' + str(index))
+ if not sym:
+ break
+ index += 1
+ hex = bytes.decode(elf.load_symbol(sym))
+ if hex[-1] == '\0':
+ hex = hex[:-1]
+ for part in hex.split(';'):
+ if not part:
+ continue
+ if part[0] != ':':
+ raise Exception('ihex line does not start with ":"')
+ blobs.append(bytes.fromhex(part[1:]))
+ if not blobs:
+ return
+ with open(filename, 'wb') as f:
+ for blob in blobs:
+ f.write(blob)
+ print("saved %d bytes from %d blobs to %s" % (sum(map(len, blobs)),
+ len(blobs), filename))
+
def extract_symbol(elf, symname, filename):
blob = elf.load_symbol(elf.dynsym[symname])
f = open(filename, 'wb')
f.close()
print("saved %d bytes to %s" % (len(blob), filename))
+def try_extract_symbol(elf, symname, filename):
+ if not symname in elf.dynsym:
+ return
+ extract_symbol(elf, symname, filename)
+
def extract_bitstream(elf, lv):
- extract_symbol(elf, 'gLogic16Lv'+lv+'CompressedBitstream',
- 'saleae-logic16-fpga-'+lv+'.bitstream')
+ extract_symbol(elf, 'gLogic16Lv' + lv + 'CompressedBitstream',
+ 'saleae-logic16-fpga-' + lv + '.bitstream')
def usage():
print("sigrok-fwextract-saleae-logic16 <programfile>")
try:
filename = sys.argv[1]
elf = parseelf.elf(filename)
+ if elf.ehdr['e_machine'] != 3 and elf.ehdr['e_machine'] != 62:
+ raise Exception('Unsupported e_machine')
+ if not extract_fx2_firmware_single(elf, 'Logic16FirmwareStrings', 'saleae-logic16-fx2.fw'):
+ extract_fx2_firmware(elf, 'gLogic16HexFileLines', 'saleae-logic16-fx2.fw')
extract_bitstream(elf, '18')
extract_bitstream(elf, '33')
+ extract_fx3_firmware(elf, 'LogicPro16FirmwareStrings', 'saleae-logicpro16-fx3.fw')
+ extract_fx3_firmware(elf, 'LogicPro8FirmwareStrings', 'saleae-logicpro8-fx3.fw')
+ try_extract_symbol(elf, 'gLogicPro16CompressedBitstream', 'saleae-logicpro16-fpga.bitstream')
+ try_extract_symbol(elf, 'gLogicProCompressedBitstream', 'saleae-logicpro8-fpga.bitstream')
except Exception as e:
print("Error: %s" % str(e))
-
projects / sigrok-util.git / blobdiff