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[Qemu-devel] [RFC 13/30] target-i386: emulate LOCK'ed INC using atomic h
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [RFC 13/30] target-i386: emulate LOCK'ed INC using atomic helper |
Date: |
Mon, 27 Jun 2016 15:01:59 -0400 |
Signed-off-by: Emilio G. Cota <address@hidden>
---
target-i386/translate.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/target-i386/translate.c b/target-i386/translate.c
index 1dc7014..a9fa25a 100644
--- a/target-i386/translate.c
+++ b/target-i386/translate.c
@@ -1433,9 +1433,30 @@ static void gen_op(DisasContext *s1, int op, TCGMemOp
ot, int d)
}
}
+static void gen_inc_locked(DisasContext *s1, TCGMemOp ot, int c)
+{
+ TCGv t0;
+
+ t0 = tcg_temp_new();
+ tcg_gen_movi_tl(t0, 1);
+ gen_compute_eflags_c(s1, cpu_cc_src);
+ if (c > 0) {
+ gen_atomic_add_fetch(cpu_T0, cpu_A0, t0, ot);
+ set_cc_op(s1, CC_OP_INCB + ot);
+ } else {
+ gen_atomic_sub_fetch(cpu_T0, cpu_A0, t0, ot);
+ set_cc_op(s1, CC_OP_DECB + ot);
+ }
+ tcg_gen_mov_tl(cpu_cc_dst, cpu_T0);
+ tcg_temp_free(t0);
+}
+
/* if d == OR_TMP0, it means memory operand (address in A0) */
static void gen_inc(DisasContext *s1, TCGMemOp ot, int d, int c)
{
+ if (s1->prefix & PREFIX_LOCK) {
+ return gen_inc_locked(s1, ot, c);
+ }
if (d != OR_TMP0) {
gen_op_mov_v_reg(ot, cpu_T0, d);
} else {
--
2.5.0
- [Qemu-devel] [RFC 02/30] tcg: add tcg_cmpxchg_lock, (continued)
- [Qemu-devel] [RFC 02/30] tcg: add tcg_cmpxchg_lock, Emilio G. Cota, 2016/06/27
- [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, 2016/06/27
- [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 <=
- [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
- [Qemu-devel] [RFC 16/30] target-i386: emulate LOCK'ed XADD using atomic helper, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 23/30] target-arm: add atomic_xchg helper, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 22/30] target-arm: emulate LL/SC using cmpxchg helpers, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 29/30] linux-user: remove handling of aarch64's EXCP_STREX, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 20/30] target-i386: remove helper_lock(), Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 26/30] target-arm: add cmpxchg helpers for aarch64, Emilio G. Cota, 2016/06/27
- [Qemu-devel] [RFC 17/30] target-i386: emulate LOCK'ed BTX ops using atomic helpers, Emilio G. Cota, 2016/06/27