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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.

Backports commit 727d937b59f1f722f983e20f9cd23b0e7ef60165 from qemu
This commit is contained in:
Laurent Vivier 2018-03-01 19:16:19 -05:00 committed by Lioncash
parent 6ff83aadab
commit 770989f36f
No known key found for this signature in database
GPG Key ID: 4E3C3CC1031BA9C7
1 changed files with 12 additions and 2 deletions
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14
qemu/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_ctx);
tcg_gen_subi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
if (reg0 == 7 && opsize == OS_BYTE &&
m68k_feature(s->env, M68K_FEATURE_M68000)) {
tcg_gen_subi_i32(tcg_ctx, tmp, reg, 2);
} else {
tcg_gen_subi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
}
return tmp;
case 5: /* Indirect displacement. */
reg = get_areg(s, reg0);
@ -802,7 +807,12 @@ 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_ctx);
tcg_gen_addi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
if (reg0 == 7 && opsize == OS_BYTE &&
m68k_feature(s->env, M68K_FEATURE_M68000)) {
tcg_gen_addi_i32(tcg_ctx, tmp, reg, 2);
} else {
tcg_gen_addi_i32(tcg_ctx, tmp, reg, opsize_bytes(opsize));
}
delay_set_areg(s, reg0, tmp, true);
}
return result;