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class RelocationException(Exception):
def __init__(self, message):
super().__init__(message)
class Relocation:
def __init__(self, type, symbol, section, offset, addend):
self.type = type
self.offset = offset
self.addend = addend
self.symbol = symbol
self.section = section
self.symbol.used += 1
def __hash__(self):
return hash(self._key())
def __eq__(self, other):
if other == None:
return False
return self._key() == other._key()
def _key(self):
return (self.type,self.offset,self.addend,self.section.header)
def size(self) -> bytes:
fail("unknown relocation size")
def calculate(self, prev) -> bytes:
fail("cannot calculate relocation")
def replace(self):
if not self.section.data:
return
size = self.size()
if size <= 0:
fail("internal linker error: invalid relocation size: %i bytes (%s)" % (size, type(self).__name__))
old = self.section.data[self.offset:self.offset+size]
new = self.calculate(old)
assert len(new) == size
if len(new) > 0:
self.section.data[self.offset:self.offset+size] = new
class R_PPC_NONE(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
class R_PPC_ADDR32(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 4
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
value = self.symbol.addr + self.addend
value32 = value & 0xFFFFFFFF
try:
return struct.pack(">I", value32)
except:
raise RelocationException("R_PPC_ADDR32: 0x%08X does not fit in relocation at 0x%08X" % (value, P))
class R_PPC_ADDR16(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 2
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
value = self.symbol.addr + self.addend
value16 = value & 0xFFFF
if self.symbol.name == "data_80450AF0":
print("%04X" % value)
print("%04X" % value16)
try:
return struct.pack(">H", value16)
except:
raise RelocationException("R_PPC_ADDR16: 0x%04X (%i) does not fit in relocation at 0x%08X" % (value16, value16, P))
class R_PPC_ADDR16_LO(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 2
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
value = self.symbol.addr + self.addend
value16 = value & 0xFFFF
try:
return struct.pack(">H", value16)
except:
raise RelocationException("R_PPC_ADDR16_LO: 0x%04X (%i) does not fit in relocation at 0x%08X" % (value16, value16, P))
class R_PPC_ADDR16_HI(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 2
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
value = self.symbol.addr + self.addend
value16 = (value >> 16) & 0xFFFF
try:
return struct.pack(">H", value16)
except:
raise RelocationException("R_PPC_ADDR16_HI: 0x%04X (%i) does not fit in relocation at 0x%08X" % (value16, value16, P))
class R_PPC_ADDR16_HA(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 2
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
value = self.symbol.addr + self.addend
x = value & 0xFFFFFFFF
ha = (x >> 16) + (1 if (x & 0x8000) else 0)
ha16 = ha & 0xFFFF
try:
return struct.pack(">H", ha16)
except:
raise RelocationException("R_PPC_ADDR16_HA: 0x%04X (%i) does not fit in relocation at 0x%08X" % (ha16, ha16, P))
class R_PPC_REL24(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 4
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
A = self.addend
S = self.symbol.addr
R = (S + A - P) & 0xFFFFFFFF
TM = (0b111111 << 26) & 0xFFFFFFFF
BM = (0b11)
try:
if (R & BM) != 0:
raise Exception()
if (R & TM) != 0 and (R & TM) != TM:
raise Exception()
p32 = struct.unpack(">I", prev)[0]
r24 = struct.pack(">I", p32 | (R & ~TM))
return bytes(r24)
except:
raise RelocationException("R_PPC_REL24: 0x%08X does not fit in relocation at 0x%08X" % (R, P))
class R_PPC_REL14(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
def size(self) -> bytes:
return 4
def calculate(self, prev) -> bytes:
P = self.section.getVirtualAddr(self.offset)
A = self.addend
S = self.symbol.addr
R = (S + A - P) & 0xFFFFFFFF
TM = 0b1111111111111111 << 16
BM = 0b11
try:
if (R & BM) != 0:
raise Exception()
if (R & TM) != 0 and (R & TM) != TM:
raise Exception()
p32 = struct.unpack(">I", prev)[0]
r14 = struct.pack(">I", p32 | (R & ~TM))
return bytes(r14)
except:
raise RelocationException("R_PPC_REL24: 0x%08X does not fit in relocation at 0x%08X" % (R, P))
class R_PPC_EMB_SDA21(Relocation):
def __init__(self, type, symbol, section, offset, addend):
super().__init__(type, symbol, section, offset, addend)
self.sections = {
".sdata": (13, 0x80458580),
".sbss": (13, 0x80458580),
".sdata2": (2, 0x80459A00),
".sbss2": (2, 0x80459A00),
".PPC.EMB.sdata0": (0, 0x00000000),
".PPC.EMB.sbss0": (0, 0x00000000),
}
def size(self) -> bytes:
return 4
def calculate(self, prev) -> bytes:
symbol_section = self.symbol.getSection()
if not symbol_section.name in self.sections:
fail("R_PPC_EMB_SDA21: symbol in section '%s' cannot be relocated" % self.section.name)
P = self.section.getVirtualAddr(self.offset)
B, X = self.sections[symbol_section.name]
A = self.addend
S = self.symbol.addr
R = (S + A - X)
if R >= -32768 and R < 32768:
value = R & 0xFFFF
else:
raise RelocationException("R_PPC_EMB_SDA21: relocation value too big! %08X" % R)
return bytes([
prev[0],
(prev[1] & ~0x1F) | (B & 0x1F),
(value >> 8),
(value & 0Xff)
])
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