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[Qemu-devel] [RFC 14/30] target-i386: emulate LOCK'ed NOT using atomic h
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [RFC 14/30] target-i386: emulate LOCK'ed NOT using atomic helper |
Date: |
Mon, 27 Jun 2016 15:02:00 -0400 |
Signed-off-by: Emilio G. Cota <address@hidden>
---
target-i386/translate.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index a9fa25a..fcccb1a 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -4784,11 +4784,19 @@ static target_ulong disas_insn(CPUX86State *env,
DisasContext *s,
set_cc_op(s, CC_OP_LOGICB + ot);
break;
case 2: /* not */
- tcg_gen_not_tl(cpu_T0, cpu_T0);
- if (mod != 3) {
- gen_op_st_v(s, ot, cpu_T0, cpu_A0);
+ if (s->prefix & PREFIX_LOCK) {
+ if (mod == 3) {
+ goto illegal_op;
+ }
+ tcg_gen_movi_tl(cpu_T0, ~0);
+ gen_atomic_xor_fetch(cpu_T0, cpu_A0, cpu_T0, ot);
} else {
- gen_op_mov_reg_v(ot, rm, cpu_T0);
+ tcg_gen_not_tl(cpu_T0, cpu_T0);
+ if (mod != 3) {
+ gen_op_st_v(s, ot, cpu_T0, cpu_A0);
+ } else {
+ gen_op_mov_reg_v(ot, rm, cpu_T0);
+ }
}
break;
case 3: /* neg */
--
2.5.0
- Re: [Qemu-devel] [RFC 01/30] softmmu: add cmpxchg helpers, (continued)
- [Qemu-devel] [RFC 12/30] target-i386: emulate LOCK'ed OP instructions using atomic helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 09/30] softmmu: add atomic helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 07/30] atomics: add atomic_xor, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 08/30] atomics: add atomic_op_fetch variants, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 14/30] target-i386: emulate LOCK'ed NOT using atomic helper,
Emilio G. Cota <=
- [Qemu-devel] [RFC 10/30] cpu_ldst: add cpu_atomic helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 11/30] target-i386: add atomic helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 06/30] target-i386: emulate LOCK'ed cmpxchg8b/16b using cmpxchg helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 05/30] target-i386: emulate LOCK'ed cmpxchg using cmpxchg helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 13/30] target-i386: emulate LOCK'ed INC using atomic helper, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 15/30] target-i386: emulate LOCK'ed NEG using cmpxchg helper, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 27/30] target-arm: emulate aarch64's LL/SC using cmpxchg helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 25/30] helper: add DEF_HELPER_6, Emilio G. Cota, 2016/06/27