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[Qemu-devel] [PATCH for-2.5 24/30] m68k: add DBcc and Scc (memory operan
From: |
Laurent Vivier |
Subject: |
[Qemu-devel] [PATCH for-2.5 24/30] m68k: add DBcc and Scc (memory operand) |
Date: |
Sun, 9 Aug 2015 22:13:43 +0200 |
Signed-off-by: Laurent Vivier <address@hidden>
---
target-m68k/translate.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/target-m68k/translate.c b/target-m68k/translate.c
index 95d58d1..cb746d7 100644
--- a/target-m68k/translate.c
+++ b/target-m68k/translate.c
@@ -994,6 +994,50 @@ static void gen_jmp_tb(DisasContext *s, int n, uint32_t
dest)
s->is_jmp = DISAS_TB_JUMP;
}
+DISAS_INSN(scc_mem)
+{
+ TCGLabel *l1;
+ int cond;
+ TCGv dest;
+
+ l1 = gen_new_label();
+ cond = (insn >> 8) & 0xf;
+ dest = tcg_temp_local_new();
+ tcg_gen_movi_i32(dest, 0);
+ gen_jmpcc(s, cond ^ 1, l1);
+ tcg_gen_movi_i32(dest, 0xff);
+ gen_set_label(l1);
+ DEST_EA(env, insn, OS_BYTE, dest, NULL);
+ tcg_temp_free(dest);
+}
+
+DISAS_INSN(dbcc)
+{
+ TCGLabel *l1;
+ TCGv reg;
+ TCGv tmp;
+ int16_t offset;
+ uint32_t base;
+
+ reg = DREG(insn, 0);
+ base = s->pc;
+ offset = cpu_ldsw_code(env, s->pc);
+ s->pc += 2;
+ l1 = gen_new_label();
+ gen_jmpcc(s, (insn >> 8) & 0xf, l1);
+
+ tmp = tcg_temp_new();
+ tcg_gen_ext16s_i32(tmp, reg);
+ tcg_gen_addi_i32(tmp, tmp, -1);
+ gen_partset_reg(OS_WORD, reg, tmp);
+ tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, -1, l1);
+ update_cc_op(s);
+ gen_jmp_tb(s, 1, base + offset);
+ gen_set_label(l1);
+ update_cc_op(s);
+ gen_jmp_tb(s, 0, s->pc);
+}
+
DISAS_INSN(undef_mac)
{
gen_exception(s, s->pc - 2, EXCP_LINEA);
@@ -3248,6 +3292,9 @@ void register_m68k_insns (CPUM68KState *env)
INSN(addsubq, 5080, f0c0, M68000);
INSN(scc, 50c0, f0f8, CF_ISA_A);
INSN(addsubq, 5080, f1c0, CF_ISA_A);
+ INSN(scc_mem, 50c0, f0c0, M68000);
+ INSN(scc, 50c0, f0f8, M68000);
+ INSN(dbcc, 50c8, f0f8, M68000);
INSN(tpf, 51f8, fff8, CF_ISA_A);
/* Branch instructions. */
--
2.4.3
- Re: [Qemu-devel] [PATCH for-2.5 20/30] m68k: add exg, (continued)
[Qemu-devel] [PATCH for-2.5 21/30] m68k: add bkpt, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 19/30] m68k: add cmpm, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 25/30] m68k: add abcd, sbcd, nbcd instructions, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 24/30] m68k: add DBcc and Scc (memory operand),
Laurent Vivier <=
[Qemu-devel] [PATCH for-2.5 22/30] m68k: add cas instruction, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 23/30] m68k: add linkl, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 27/30] m68k: add addx/subx/negx, Laurent Vivier, 2015/08/09
[Qemu-devel] [PATCH for-2.5 28/30] m68k: shift/rotate bytes and words, Laurent Vivier, 2015/08/09