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target-m68k: add dbcc

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Backports commit beff27ab3a60d8abab4a166670ca79b3c0970005 from qemu
This commit is contained in:
Laurent Vivier 2018-02-28 00:45:10 -05:00 committed by Lioncash
parent 977c3fe6c4
commit b796f934ff
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 26 additions and 0 deletions
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26
qemu/target-m68k/translate.c
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@ -1107,6 +1107,31 @@ DISAS_INSN(scc)
tcg_temp_free(tcg_ctx, tmp);
}
DISAS_INSN(dbcc)
{
TCGContext *tcg_ctx = s->uc->tcg_ctx;
TCGLabel *l1;
TCGv reg;
TCGv tmp;
int16_t offset;
uint32_t base;
reg = DREG(insn, 0);
base = s->pc;
offset = (int16_t)read_im16(env, s);
l1 = gen_new_label(tcg_ctx);
gen_jmpcc(s, (insn >> 8) & 0xf, l1);
tmp = tcg_temp_new(tcg_ctx);
tcg_gen_ext16s_i32(tcg_ctx, tmp, reg);
tcg_gen_addi_i32(tcg_ctx, tmp, tmp, -1);
gen_partset_reg(s, OS_WORD, reg, tmp);
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_EQ, tmp, -1, l1);
gen_jmp_tb(s, 1, base + offset);
gen_set_label(tcg_ctx, l1);
gen_jmp_tb(s, 0, s->pc);
}
DISAS_INSN(undef_mac)
{
gen_exception(s, s->pc - 2, EXCP_LINEA);
@ -3219,6 +3244,7 @@ void register_m68k_insns (CPUM68KState *env)
INSN(addsubq, 5080, f0c0, M68000);
INSN(scc, 50c0, f0f8, CF_ISA_A); /* Scc.B Dx */
INSN(scc, 50c0, f0c0, M68000); /* Scc.B <EA> */
INSN(dbcc, 50c8, f0f8, M68000);
INSN(addsubq, 5080, f1c0, CF_ISA_A);
INSN(tpf, 51f8, fff8, CF_ISA_A);