From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:57517) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gdz1W-0006BO-Si for qemu-devel@nongnu.org; Mon, 31 Dec 2018 09:58:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gdz1T-0004U0-0D for qemu-devel@nongnu.org; Mon, 31 Dec 2018 09:58:34 -0500 Received: from mx2.rt-rk.com ([89.216.37.149]:60639 helo=mail.rt-rk.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gdz1J-0003zV-SF for qemu-devel@nongnu.org; Mon, 31 Dec 2018 09:58:23 -0500 From: Aleksandar Markovic Date: Mon, 31 Dec 2018 15:56:28 +0100 Message-Id: <1546268200-26966-33-git-send-email-aleksandar.markovic@rt-rk.com> In-Reply-To: <1546268200-26966-1-git-send-email-aleksandar.markovic@rt-rk.com> References: <1546268200-26966-1-git-send-email-aleksandar.markovic@rt-rk.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PULL v2 32/44] disas: nanoMIPS: Comment the decoder of 'gpr4.zero' gpr encoding type List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, amarkovic@wavecomp.com From: Aleksandar Markovic Comment the decoder of 'gpr4.zero' gpr encoding type in nanoMIPS disassembler. Reviewed-by: Aleksandar Rikalo Signed-off-by: Aleksandar Markovic --- disas/nanomips.cpp | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp index 66b1223..de96125 100644 --- a/disas/nanomips.cpp +++ b/disas/nanomips.cpp @@ -397,6 +397,33 @@ uint64 NMD::encode_rd1_from_rd(uint64 d) } =20 =20 +/* + * NMD::decode_gpr_gpr4_zero() - decoder for 'gpr4.zero' gpr encoding ty= pe + * + * Map a 4-bit code to the 5-bit register space according to this patt= ern: + * + * 1 0 + * 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * | | | | | | | | | | | | | | | | + * | | | | | | | | | | | | =E2=94=94-----------------= ----=E2=94=90 + * | | | | | | | | | | | =E2=94=94---------------=E2=94= =90 | + * | | | | | | | | | | =E2=94=94---------------=E2=94= =90 | | + * | | | | | | | | | =E2=94=94---------------=E2=94=90= | | | + * | | | | | | | | =E2=94=94---------------=E2=94=90 = | | | | + * | | | | | | | | | | | | | | | | + * | | | | | | | | | | | | | | | | + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * 3 2 1 0 + * + * This pattern is the same one used for 'gpr4' gpr encoding type, exc= ept for + * the input value 3, that is mapped to the output value 0 instead of 11= . + * + * Used in handling following instructions: + * + * - MOVE.BALC + * - MOVEP + * - SW[4X4] + */ uint64 NMD::decode_gpr_gpr4_zero(uint64 d) { static uint64 register_list[] =3D { 8, 9, 10, 0, 4, 5, 6, 7, --=20 2.7.4