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target-i386: emulate XCHG using atomic helper

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Backports commit ea97ebe89f7a879ea9aba90140e40c29b5cbd653 from qemu
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Emilio G. Cota 2018-02-27 23:40:13 -05:00 committed by Lioncash
parent 8f96b6beb9
commit 9d9b7dedac
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 2 additions and 6 deletions
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8
qemu/target-i386/translate.c
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@ -6224,12 +6224,8 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s,
gen_lea_modrm(env, s, modrm); gen_lea_modrm(env, s, modrm);
gen_op_mov_v_reg(tcg_ctx, ot, cpu_T0, reg); gen_op_mov_v_reg(tcg_ctx, ot, cpu_T0, reg);
/* for xchg, lock is implicit */ /* for xchg, lock is implicit */
if (!(prefixes & PREFIX_LOCK)) tcg_gen_atomic_xchg_tl(tcg_ctx, cpu_T1, cpu_A0, cpu_T0,
gen_helper_lock(tcg_ctx, cpu_env); s->mem_index, ot | MO_LE);
gen_op_ld_v(s, ot, cpu_T1, cpu_A0);
gen_op_st_v(s, ot, cpu_T0, cpu_A0);
if (!(prefixes & PREFIX_LOCK))
gen_helper_unlock(tcg_ctx, cpu_env);
gen_op_mov_reg_v(tcg_ctx, ot, reg, cpu_T1); gen_op_mov_reg_v(tcg_ctx, ot, reg, cpu_T1);
} }
break; break;