Use correct endianness for Capstone disassemblers

pwndbg/disasm/__init__.py

@@ -33,13 +33,14 @@ last_arch    = None
 
 
 CapstoneArch = {
-    'arm':     Cs(CS_ARCH_ARM, CS_MODE_ARM),
-    'aarch64': Cs(CS_ARCH_ARM64, CS_MODE_ARM),
-    'i386':    Cs(CS_ARCH_X86, CS_MODE_32),
-    'x86-64':  Cs(CS_ARCH_X86, CS_MODE_64),
-    'powerpc': Cs(CS_ARCH_PPC, CS_MODE_32),
-    'mips':    Cs(CS_ARCH_MIPS, CS_MODE_32),
-    'sparc':   Cs(CS_ARCH_SPARC, 0),
+    ('arm', 'little'):     Cs(CS_ARCH_ARM, CS_MODE_ARM),
+    ('aarch64', 'little'): Cs(CS_ARCH_ARM64, CS_MODE_ARM),
+    ('i386', 'little'):    Cs(CS_ARCH_X86, CS_MODE_32),
+    ('x86-64', 'little'):  Cs(CS_ARCH_X86, CS_MODE_64),
+    ('powerpc', 'little'): Cs(CS_ARCH_PPC, CS_MODE_32),
+    ('mips', 'little'):    Cs(CS_ARCH_MIPS, CS_MODE_32),
+    ('mips', 'big'):       Cs(CS_ARCH_MIPS, CS_MODE_32 | CS_MODE_BIG_ENDIAN),
+    ('sparc', 'little'):   Cs(CS_ARCH_SPARC, 0),
 }
 
 for cs in CapstoneArch.values():
@@ -59,11 +60,14 @@ backward_cache = collections.defaultdict(lambda: 0)
 
 def get_disassembler(pc):
     arch = pwndbg.arch.current
-    d    = CapstoneArch[arch]
+    endian = pwndbg.arch.endian
+    d    = CapstoneArch[(arch, endian)]
+
     if arch in ('arm', 'aarch64'):
         d.mode = {0:CS_MODE_ARM,0x20:CS_MODE_THUMB}[pwndbg.regs.cpsr & 0x20]
     else:
         d.mode = {4:CS_MODE_32, 8:CS_MODE_64}[pwndbg.arch.ptrsize]
+
     return d
 
 @pwndbg.memoize.reset_on_cont