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target-aarch64: Generate fences for aarch64 

Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Message-Id: <20160714202026.9727-14-bobby.prani@gmail.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Pranith Kumar 2016-07-14 16:20:25 -04:00 committed by Richard Henderson
parent 61e4c432ab
commit ce1bd93f94
1 changed files with 26 additions and 1 deletions
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27
target-arm/translate-a64.c
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@ -1294,6 +1294,8 @@ static void gen_clrex(DisasContext *s, uint32_t insn)
static void handle_sync(DisasContext *s, uint32_t insn,
unsigned int op1, unsigned int op2, unsigned int crm)
{
TCGBar bar;
if (op1 != 3) {
unallocated_encoding(s);
return;
@ -1305,7 +1307,18 @@ static void handle_sync(DisasContext *s, uint32_t insn,
return;
case 4: /* DSB */
case 5: /* DMB */
/* We don't emulate caches so barriers are no-ops */
switch (crm & 3) {
case 1: /* MBReqTypes_Reads */
bar = TCG_BAR_SC | TCG_MO_LD_LD | TCG_MO_LD_ST;
break;
case 2: /* MBReqTypes_Writes */
bar = TCG_BAR_SC | TCG_MO_ST_ST;
break;
default: /* MBReqTypes_All */
bar = TCG_BAR_SC | TCG_MO_ALL;
break;
}
tcg_gen_mb(bar);
return;
case 6: /* ISB */
/* We need to break the TB after this insn to execute
@ -1934,7 +1947,13 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
if (!is_store) {
s->is_ldex = true;
gen_load_exclusive(s, rt, rt2, tcg_addr, size, is_pair);
if (is_lasr) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
}
} else {
if (is_lasr) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
}
gen_store_exclusive(s, rs, rt, rt2, tcg_addr, size, is_pair);
}
} else {
@ -1943,11 +1962,17 @@ static void disas_ldst_excl(DisasContext *s, uint32_t insn)
/* Generate ISS for non-exclusive accesses including LASR. */
if (is_store) {
if (is_lasr) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
}
do_gpr_st(s, tcg_rt, tcg_addr, size,
true, rt, iss_sf, is_lasr);
} else {
do_gpr_ld(s, tcg_rt, tcg_addr, size, false, false,
true, rt, iss_sf, is_lasr);
if (is_lasr) {
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
}
}
}
}