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: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Thomas Huth <huth@tuxfamily.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Message-Id: <1484332593-16782-6-git-send-email-laurent@vivier.eu>
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@ -725,7 +725,12 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
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}
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reg = get_areg(s, reg0);
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tmp = tcg_temp_new();
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if (reg0 == 7 && opsize == OS_BYTE &&
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m68k_feature(s->env, M68K_FEATURE_M68000)) {
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tcg_gen_subi_i32(tmp, reg, 2);
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} else {
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tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize));
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}
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return tmp;
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case 5: /* Indirect displacement. */
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reg = get_areg(s, reg0);
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@ -801,7 +806,12 @@ static TCGv gen_ea_mode(CPUM68KState *env, DisasContext *s, int mode, int reg0,
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result = gen_ldst(s, opsize, reg, val, what);
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if (what == EA_STORE || !addrp) {
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TCGv tmp = tcg_temp_new();
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if (reg0 == 7 && opsize == OS_BYTE &&
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m68k_feature(s->env, M68K_FEATURE_M68000)) {
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tcg_gen_addi_i32(tmp, reg, 2);
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} else {
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tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize));
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}
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delay_set_areg(s, reg0, tmp, true);
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}
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return result;
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