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target-m68k: increment/decrement with SP

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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>
This commit is contained in:
Laurent Vivier 2017-01-13 19:36:33 +01:00
parent b19578f428
commit 727d937b59
1 changed files with 12 additions and 2 deletions
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14
target/m68k/translate.c
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@ -725,7 +725,12 @@ static TCGv gen_lea_mode(CPUM68KState *env, DisasContext *s,
}
reg = get_areg(s, reg0);
tmp = tcg_temp_new();
tcg_gen_subi_i32(tmp, reg, opsize_bytes(opsize));
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();
tcg_gen_addi_i32(tmp, reg, opsize_bytes(opsize));
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;