target/arm: Convert T16, nop hints
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20190904193059.26202-60-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -19,6 +19,7 @@
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# This file is processed by scripts/decodetree.py
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#
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&empty !extern
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&s_rrr_shi !extern s rd rn rm shim shty
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&s_rrr_shr !extern s rn rd rm rs shty
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&s_rri_rot !extern s rn rd imm rot
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@ -204,3 +205,19 @@ SETEND 1011 0110 010 1 E:1 000 &setend
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REV 1011 1010 00 ... ... @rdm
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REV16 1011 1010 01 ... ... @rdm
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REVSH 1011 1010 11 ... ... @rdm
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# Hints
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{
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YIELD 1011 1111 0001 0000
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WFE 1011 1111 0010 0000
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WFI 1011 1111 0011 0000
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# TODO: Implement SEV, SEVL; may help SMP performance.
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# SEV 1011 1111 0100 0000
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# SEVL 1011 1111 0101 0000
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# The canonical nop has the second nibble as 0000, but the whole of the
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# rest of the space is a reserved hint, behaves as nop.
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NOP 1011 1111 ---- 0000
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}
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@ -10891,8 +10891,7 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
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case 15: /* IT, nop-hint. */
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if ((insn & 0xf) == 0) {
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gen_nop_hint(s, (insn >> 4) & 0xf);
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break;
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goto illegal_op; /* nop hint, in decodetree */
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}
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/*
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* IT (If-Then)
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