Commit 56e6250e authored by Richard Henderson's avatar Richard Henderson Committed by Peter Maydell
Browse files

target/arm: Convert T16, nop hints 



Reviewed-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: default avatarPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190904193059.26202-60-richard.henderson@linaro.org
Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
parent ae3002b0

target/arm/t16.decode

+17 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
# This file is processed by scripts/decodetree.py

#



&empty           !extern

&s_rrr_shi       !extern s rd rn rm shim shty

&s_rrr_shr       !extern s rn rd rm rs shty

&s_rri_rot       !extern s rn rd imm rot
@@ -204,3 +205,19 @@ SETEND 1011 0110 010 1 E:1 000 &setend 
REV             1011 1010 00 ... ...            @rdm

REV16           1011 1010 01 ... ...            @rdm

REVSH           1011 1010 11 ... ...            @rdm



# Hints



{

  YIELD         1011 1111 0001 0000

  WFE           1011 1111 0010 0000

  WFI           1011 1111 0011 0000



  # TODO: Implement SEV, SEVL; may help SMP performance.

  # SEV         1011 1111 0100 0000

  # SEVL        1011 1111 0101 0000



  # The canonical nop has the second nibble as 0000, but the whole of the

  # rest of the space is a reserved hint, behaves as nop.

  NOP           1011 1111 ---- 0000

}

target/arm/translate.c

+1 −2
Original line number Diff line number Diff line
@@ -10891,8 +10891,7 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn) 


        case 15: /* IT, nop-hint.  */

            if ((insn & 0xf) == 0) {

                gen_nop_hint(s, (insn >> 4) & 0xf);

                break;

                goto illegal_op; /* nop hint, in decodetree */

            }

            /*

             * IT (If-Then)