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thumb2: incorrect LDR addressing and immediate field #14

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pistol opened this issue Oct 17, 2013 · 0 comments

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pistol commented Oct 17, 2013

>>> darm.disasm_thumb2(0xf8519003).__str__()
'ldr r9, [r1], r3, lsl #0'
>>> darm.disasm_thumb2(0xf8519003)
Darm(instr=I_LDR, instr_type=T_INVLD, cond=C_AL, Rn=r1, Rm=r3, Rt=r9, I=True, rotate=0, Shift(type_=S_LSL, shift=0))

objdump: f851 9003 ldr.w r9, [r1, r3]

Note the addressing difference, darm's [r1], r3 versus proper [r1, r3].
I bit should not be set and there is no shifting. According to the manual A8.8.65:
For encoding T2, <shift> can only be omitted, encoded as imm2 = 0b00, or LSL #<imm> with <imm> = 1, 2, or 3, and <imm> encoded in imm2.

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