From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46435) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bz70c-0005qU-4E for qemu-devel@nongnu.org; Tue, 25 Oct 2016 15:03:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bz70b-0007mg-7m for qemu-devel@nongnu.org; Tue, 25 Oct 2016 15:03:38 -0400 Received: from mout.kundenserver.de ([217.72.192.73]:58171) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1bz70a-0007mH-Ur for qemu-devel@nongnu.org; Tue, 25 Oct 2016 15:03:37 -0400 From: Laurent Vivier Date: Tue, 25 Oct 2016 21:03:00 +0200 Message-Id: <1477422199-11208-5-git-send-email-laurent@vivier.eu> In-Reply-To: <1477422199-11208-1-git-send-email-laurent@vivier.eu> References: <1477422199-11208-1-git-send-email-laurent@vivier.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PULL 04/23] target-m68k: manage scaled index List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: schwab@linux-m68k.org, agraf@suse.de, Richard Henderson , gerg@uclinux.org, Laurent Vivier Scaled index is not supported by 68000, 68008, and 68010. EA = (bd + PC) + Xn.SIZE*SCALE + od Ignore it: M68000 FAMILY PROGRAMMER’S REFERENCE MANUAL 2.4 BRIEF EXTENSION WORD FORMAT COMPATIBILITY "If the MC68000 were to execute an instruction that encoded a scaling factor, the scaling factor would be ignored and would not access the desired memory address. The earlier microprocessors do not recognize the brief extension word formats implemented by newer processors. Although they can detect illegal instructions, they do not decode invalid encodings of the brief extension word formats as exceptions." Signed-off-by: Laurent Vivier Reviewed-by: Richard Henderson --- target-m68k/translate.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target-m68k/translate.c b/target-m68k/translate.c index 3773fb4..d73350c 100644 --- a/target-m68k/translate.c +++ b/target-m68k/translate.c @@ -315,6 +315,11 @@ static TCGv gen_lea_indexed(CPUM68KState *env, DisasContext *s, TCGv base) if ((ext & 0x800) == 0 && !m68k_feature(s->env, M68K_FEATURE_WORD_INDEX)) return NULL_QREG; + if (m68k_feature(s->env, M68K_FEATURE_M68000) && + !m68k_feature(s->env, M68K_FEATURE_SCALED_INDEX)) { + ext &= ~(3 << 9); + } + if (ext & 0x100) { /* full extension word format */ if (!m68k_feature(s->env, M68K_FEATURE_EXT_FULL)) -- 2.7.4