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96f86f472a
Refactor the Thumb decode to do the loads of the instruction words at the top level rather than only loading the second half of a 32-bit Thumb insn in the middle of the decode. This is simple apart from the awkward case of Thumb1, where the BL/BLX prefix and suffix instructions live in what in Thumb2 is the 32-bit insn space. To handle these we decode enough to identify whether we're looking at a prefix/suffix that we handle as a 16 bit insn, or a prefix that we're going to merge with the following suffix to consider as a 32 bit insn. The translation of the 16 bit cases then moves from disas_thumb2_insn() to disas_thumb_insn(). The refactoring has the benefit that we don't need to pass the CPUARMState* down into the decoder code any more, but the major reason for doing this is that some Thumb instructions must be always unconditional regardless of the IT state bits, so we need to know the whole insn before we emit the "skip this insn if the IT bits and cond state tell us to" code. (The always unconditional insns are BKPT, HLT and SG; the last of these is 32 bits.) Backports commit 296e5a0a6c393553079a641c50521ae33ff89324 from qemu |
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