| Message ID | 1477422199-11208-5-git-send-email-laurent@vivier.eu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
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))
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 <laurent@vivier.eu> Reviewed-by: Richard Henderson <rth@twiddle.net> --- target-m68k/translate.c | 5 +++++ 1 file changed, 5 insertions(+)