def ebpf_xadd_(obj, sz, dreg, sreg, off, imm):
size = {0: 32, 1: 16, 2: 8, 3: 64}[sz]
if (size < 32) or imm != 0:
raise InstructionError(obj)
dst = env.mem(env.R[dreg] + off.int(-1), size)
src = env.R[sreg][0:size]
obj.operands = [dst, src]
obj.type = type_data_processing
def ebpf_ld_(obj, sz, dreg, sreg, off, imm, _abs):
size = {0: 32, 1: 16, 2: 8, 3: 64}[sz]
dst = env.R[0]
adr = env.reg("#skb", 64)
if not _abs:
adr += env.R[sreg]
src = env.mem(adr, size, disp=imm.int(-1))
obj.operands = [dst, src]
obj.type = type_data_processing
def ebpf_ldx_(obj, sz, dreg, sreg, off, imm):
size = {0: 32, 1: 16, 2: 8, 3: 64}[sz]
if imm != 0:
raise InstructionError(obj)
dst = env.R[dreg]
src = env.R[sreg]
src = env.mem(src + off.int(-1), size)
obj.operands = [dst, src]
obj.type = type_data_processing
def ebpf_ld_(obj,sz,dreg,sreg,off,imm,_abs):
size = {0:32,1:16,2:8,3:64}[sz]
dst = env.R[0]
adr = env.reg('#skb',64)
if not _abs: adr += env.R[sreg]
src = env.mem(adr,size,disp=imm.int(-1))
obj.operands = [dst,src]
obj.mnemonic += {8:'b',16:'h',32:'w',64:'dw'}[size]
obj.type = type_data_processing
def bpf_ld_(obj, sz, md, jt, jf, k):
if sz == 3:
raise InstructionError(obj)
size = 32 >> sz
dst = env.A
adr = env.skb()
if md == 0: # IMM
src = env.cst(k.int(-1), 32)
elif md == 1: # ABS
src = env.mem(adr, size, disp=k.int(-1))
elif md == 2: # IND
src = env.mem(adr + env.X + k.int(-1), size)
elif md == 3 and k.int() < 16: # MEM
src = env.M[k.int()]
elif md == 4: # LEN
src = env.skb("len")
else:
raise InstructionError(obj)
obj.operands = [dst, src]
obj.type = type_data_processing
def ebpf_st_(obj, sz, dreg, sreg, off, imm):
size = {0: 32, 1: 16, 2: 8, 3: 64}[sz]
dst = env.mem(env.R[dreg] + off.int(-1), size)
if obj.mnemonic == "stx":
src = env.R[sreg]
if imm != 0:
raise InstructionError(obj)
else:
src = env.cst(imm.int(-1), 32).zeroextend(64)
src = src[0:size]
obj.operands = [dst, src]
obj.type = type_data_processing
def bpf_ldx_(obj,sz,md,jt,jf,k):
if sz==3: raise InstructionError(obj)
size = 32>>sz
dst = env.X
adr = env.skb()
if md==0 and size==32: #IMM
src = env.cst(k.int(-1),32)
elif md==3 and size==32 and k.int()<16: #MEM
src = env.M[k.int()]
elif md==6 and size==8: #MSH
src = env.mem(adr,size,disp=k.int(-1))*4
else:
raise InstructionError(obj)
obj.operands = [dst,src]
obj.type = type_data_processing
