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| author | Emilio G. Cota <cota@braap.org> | 2016-06-27 15:02:02 -0400 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2016-10-26 08:29:01 -0700 |
| commit | f53b01817f95781d2bcc8a82e057d1416601e13b (patch) | |
| tree | ec235ad804483c0e86a7f864cd14c8d494cf7a85 /target-i386 | |
| parent | 8eb8c7385608b99bed6055a22d897ff727a6cb8e (diff) | |
| download | qemu-f53b01817f95781d2bcc8a82e057d1416601e13b.tar.gz | |
target-i386: emulate LOCK'ed XADD using atomic helper
[rth: Move load of reg value to common location.]
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1467054136-10430-17-git-send-email-cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/translate.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/target-i386/translate.c b/target-i386/translate.c index d2edbd9b29..3e6011b953 100644 --- a/target-i386/translate.c +++ b/target-i386/translate.c @@ -5134,19 +5134,24 @@ static target_ulong disas_insn(CPUX86State *env, DisasContext *s, modrm = cpu_ldub_code(env, s->pc++); reg = ((modrm >> 3) & 7) | rex_r; mod = (modrm >> 6) & 3; + gen_op_mov_v_reg(ot, cpu_T0, reg); if (mod == 3) { rm = (modrm & 7) | REX_B(s); - gen_op_mov_v_reg(ot, cpu_T0, reg); gen_op_mov_v_reg(ot, cpu_T1, rm); tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); gen_op_mov_reg_v(ot, reg, cpu_T1); gen_op_mov_reg_v(ot, rm, cpu_T0); } else { gen_lea_modrm(env, s, modrm); - gen_op_mov_v_reg(ot, cpu_T0, reg); - gen_op_ld_v(s, ot, cpu_T1, cpu_A0); - tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); - gen_op_st_v(s, ot, cpu_T0, cpu_A0); + if (s->prefix & PREFIX_LOCK) { + tcg_gen_atomic_fetch_add_tl(cpu_T1, cpu_A0, cpu_T0, + s->mem_index, ot | MO_LE); + tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); + } else { + gen_op_ld_v(s, ot, cpu_T1, cpu_A0); + tcg_gen_add_tl(cpu_T0, cpu_T0, cpu_T1); + gen_op_st_v(s, ot, cpu_T0, cpu_A0); + } gen_op_mov_reg_v(ot, reg, cpu_T1); } gen_op_update2_cc(); |