[Qemu-devel] [RFC v3 PATCH 09/14] tcg/sparc: Add support for fence

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

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

diff --git a/tcg/sparc/tcg-target.inc.c b/tcg/sparc/tcg-target.inc.c
index 9938a50..af8a300 100644
--- a/tcg/sparc/tcg-target.inc.c
+++ b/tcg/sparc/tcg-target.inc.c
@@ -249,6 +249,8 @@ static const int tcg_target_call_oarg_regs[] = {
 #define STWA       (INSN_OP(3) | INSN_OP3(0x14))
 #define STXA       (INSN_OP(3) | INSN_OP3(0x1e))
 
+#define MEMBAR     (INSN_OP(2) | INSN_OP3(0x28) | INSN_RS1(15) | (1 << 13))
+
 #ifndef ASI_PRIMARY_LITTLE
 #define ASI_PRIMARY_LITTLE 0x88
 #endif
@@ -825,6 +827,24 @@ static void tcg_out_call(TCGContext *s, tcg_insn_unit *dest)
     tcg_out_nop(s);
 }
 
+static void tcg_out_mb(TCGContext *s, TCGArg a0)
+{
+    uint8_t bar_opcode;
+    switch (a0 & TCG_MO_ALL) {
+    case TCG_MO_LD_LD:
+        bar_opcode = 0x5; 
+        break;
+    case TCG_MO_ST_ST:
+        bar_opcode = 0xa;
+        break;
+    default:
+        /* #StoreLoad | #LoadStore */
+        bar_opcode = 0xf;
+        break;
+    }
+    tcg_out32(s, MEMBAR | bar_opcode);
+}
+
 #ifdef CONFIG_SOFTMMU
 static tcg_insn_unit *qemu_ld_trampoline[16];
 static tcg_insn_unit *qemu_st_trampoline[16];
@@ -1450,6 +1470,10 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc,
 	tcg_out_arithc(s, a0, TCG_REG_G0, a1, const_args[1], c);
 	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.  */
@@ -1551,6 +1575,7 @@ static const TCGTargetOpDef sparc_op_defs[] = {
     { INDEX_op_qemu_st_i32, { "sZ", "A" } },
     { INDEX_op_qemu_st_i64, { "SZ", "A" } },
 
+    { INDEX_op_mb, { } },
     { -1 },
 };
 
-- 
2.9.0