[Qemu-devel] [RFC v3 PATCH 03/14] tcg/aarch64: Add support for fence

[Pranith Kumar <bobby.prani@gmail.com>]

Cc: Claudio Fontana <claudio.fontana@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
---
 tcg/aarch64/tcg-target.inc.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tcg/aarch64/tcg-target.inc.c b/tcg/aarch64/tcg-target.inc.c
index 1447f7c..bc8ac9c 100644
--- a/tcg/aarch64/tcg-target.inc.c
+++ b/tcg/aarch64/tcg-target.inc.c
@@ -372,6 +372,11 @@ typedef enum {
     I3510_EOR       = 0x4a000000,
     I3510_EON       = 0x4a200000,
     I3510_ANDS      = 0x6a000000,
+
+    /* System instructions.  */
+    DMB_ISH         = 0xd50338bf,
+    DMB_LD          = 0x00000100,
+    DMB_ST          = 0x00000200,
 } AArch64Insn;
 
 static inline uint32_t tcg_in32(TCGContext *s)
@@ -971,6 +976,21 @@ static inline void tcg_out_addsub2(TCGContext *s, int ext, TCGReg rl,
     tcg_out_mov(s, ext, orig_rl, rl);
 }
 
+static inline void tcg_out_mb(TCGContext *s, TCGArg a0)
+{
+    switch (a0 & TCG_MO_ALL) {
+    case TCG_MO_LD_LD:
+        tcg_out32(s, DMB_ISH | DMB_LD);
+        break;
+    case TCG_MO_ST_ST:
+        tcg_out32(s, DMB_ISH | DMB_ST);
+        break;
+    default:
+        tcg_out32(s, DMB_ISH | DMB_LD | DMB_ST);
+        break;
+    }
+}
+
 #ifdef CONFIG_SOFTMMU
 /* helper signature: helper_ret_ld_mmu(CPUState *env, target_ulong addr,
  *                                     TCGMemOpIdx oi, uintptr_t ra)
@@ -1637,6 +1657,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
         tcg_out_insn(s, 3508, SMULH, TCG_TYPE_I64, a0, a1, a2);
         break;
 
+    case INDEX_op_mb:
+        tcg_out_mb(s, a0);
+        break;
+
     case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
     case INDEX_op_mov_i64:
     case INDEX_op_movi_i32: /* Always emitted via tcg_out_movi.  */
@@ -1761,6 +1785,7 @@ static const TCGTargetOpDef aarch64_op_defs[] = {
     { INDEX_op_muluh_i64, { "r", "r", "r" } },
     { INDEX_op_mulsh_i64, { "r", "r", "r" } },
 
+    { INDEX_op_mb, { } },
     { -1 },
 };
 
-- 
2.9.0