Commit 727d937b authored by Laurent Vivier's avatar Laurent Vivier
Browse files

target-m68k: increment/decrement with SP 



On 680x0 family only.

Address Register indirect With postincrement:

When using the stack pointer (A7) with byte size data, the register
is incremented by two.

Address Register indirect With predecrement:

When using the stack pointer (A7) with byte size data, the register
is decremented by two.

Signed-off-by: default avatarLaurent Vivier <laurent@vivier.eu>
Reviewed-by: default avatarThomas Huth <huth@tuxfamily.org>
Reviewed-by: default avatarRichard Henderson <rth@twiddle.net>
Message-Id: <1484332593-16782-6-git-send-email-laurent@vivier.eu>
parent b19578f4

target/m68k/translate.c

+12 −2
Original line number Diff line number Diff line
@@ -725,7 +725,12 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s, 
        }

        reg = get_areg(s, reg0);

        tmp = tcg_temp_new();

        if (reg0 == 7 && opsize == OS_BYTE &&

            m68k_feature(s->env, M68K_FEATURE_M68000)) {

            tcg_gen_subi_i32(tmp, reg, 2);

        } else {

            tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize));

        }

        return tmp;

    case 5: /* Indirect displacement.  */

        reg = get_areg(s, reg0);
@@ -801,7 +806,12 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0, 
        result = gen_ldst(s, opsize, reg, val, what);

        if (what == EA_STORE || !addrp) {

            TCGv tmp = tcg_temp_new();

            if (reg0 == 7 && opsize == OS_BYTE &&

                m68k_feature(s->env, M68K_FEATURE_M68000)) {

                tcg_gen_addi_i32(tmp, reg, 2);

            } else {

                tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize));

            }

            delay_set_areg(s, reg0, tmp, true);

        }

        return result;