Allow qemu to build on 32-bit hosts without 64-bit atomic ops.
Even if we only allow 32-bit hosts to multi-thread emulate 32-bit
guests, we still need some way to handle the 32-bit guest using a
64-bit atomic operation. Do so by dropping back to single-step.
Signed-off-by: Richard Henderson <r...@twiddle.net>
---
configure | 33 +++++++++++++++++++++++++++++++++
cputlb.c | 4 ++++
tcg-runtime.c | 7 +++++++
tcg/tcg-op.c | 22 ++++++++++++++++++----
tcg/tcg-runtime.h | 46 ++++++++++++++++++++++++++++++++++++++++------
tcg/tcg.h | 15 ++++++++++++---
6 files changed, 114 insertions(+), 13 deletions(-)
diff --git a/configure b/configure
index 5b38357..0616043 100755
--- a/configure
+++ b/configure
@@ -4501,6 +4501,35 @@ EOF
fi
fi
+#########################################
+# See if 64-bit atomic operations are supported.
+# Note that without __atomic builtins, we can only
+# assume atomic loads/stores max at pointer size.
+
+cat > $TMPC << EOF
+#include <stdint.h>
+int main(void)
+{
+ uint64_t x = 0, y = 0;
+#ifdef __ATOMIC_RELAXED
+ y = __atomic_load_8(&x, 0);
+ __atomic_store_8(&x, y, 0);
+ __atomic_compare_exchange_8(&x, &y, x, 0, 0, 0);
+ __atomic_exchange_8(&x, y, 0);
+ __atomic_fetch_add_8(&x, y, 0);
+#else
+ typedef char is_host64[sizeof(void *) >= sizeof(uint64_t) ? 1 : -1];
+ __sync_lock_test_and_set(&x, y);
+ __sync_val_compare_and_swap(&x, y, 0);
+ __sync_fetch_and_add(&x, y);
+#endif
+ return 0;
+}
+EOF
+if compile_prog "" "" ; then
+ atomic64=yes
+fi
+
########################################
# check if getauxval is available.
@@ -5458,6 +5487,10 @@ if test "$atomic128" = "yes" ; then
echo "CONFIG_ATOMIC128=y" >> $config_host_mak
fi
+if test "$atomic64" = "yes" ; then
+ echo "CONFIG_ATOMIC64=y" >> $config_host_mak
+fi
+
if test "$getauxval" = "yes" ; then
echo "CONFIG_GETAUXVAL=y" >> $config_host_mak
fi
diff --git a/cputlb.c b/cputlb.c
index 845b2a7..cc4da4d 100644
--- a/cputlb.c
+++ b/cputlb.c
@@ -687,8 +687,10 @@ static void *atomic_mmu_lookup(CPUArchState *env,
target_ulong addr,
#define DATA_SIZE 4
#include "atomic_template.h"
+#ifdef CONFIG_ATOMIC64
#define DATA_SIZE 8
#include "atomic_template.h"
+#endif
#ifdef CONFIG_ATOMIC128
#define DATA_SIZE 16
@@ -713,8 +715,10 @@ static void *atomic_mmu_lookup(CPUArchState *env,
target_ulong addr,
#define DATA_SIZE 4
#include "atomic_template.h"
+#ifdef CONFIG_ATOMIC64
#define DATA_SIZE 8
#include "atomic_template.h"
+#endif
/* Code access functions. */
diff --git a/tcg-runtime.c b/tcg-runtime.c
index e952153..9327b6f 100644
--- a/tcg-runtime.c
+++ b/tcg-runtime.c
@@ -101,6 +101,11 @@ int64_t HELPER(mulsh_i64)(int64_t arg1, int64_t arg2)
return h;
}
+void HELPER(exit_atomic)(CPUArchState *env)
+{
+ cpu_loop_exit_atomic(ENV_GET_CPU(env), GETPC());
+}
+
#ifndef CONFIG_SOFTMMU
/* The softmmu versions of these helpers are in cputlb.c. */
@@ -130,8 +135,10 @@ static void *atomic_mmu_lookup(CPUArchState *env,
target_ulong addr,
#define DATA_SIZE 4
#include "atomic_template.h"
+#ifdef CONFIG_ATOMIC64
#define DATA_SIZE 8
#include "atomic_template.h"
+#endif
/* The following is only callable from other helpers, and matches up
with the softmmu version. */
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 65e3663..cdd61d6 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -2040,14 +2040,20 @@ typedef void (*gen_atomic_op_i32)(TCGv_i32, TCGv_env,
TCGv, TCGv_i32);
typedef void (*gen_atomic_op_i64)(TCGv_i64, TCGv_env, TCGv, TCGv_i64);
#endif
+#ifdef CONFIG_ATOMIC64
+# define WITH_ATOMIC64(X) X,
+#else
+# define WITH_ATOMIC64(X)
+#endif
+
static void * const table_cmpxchg[16] = {
[MO_8] = gen_helper_atomic_cmpxchgb,
[MO_16 | MO_LE] = gen_helper_atomic_cmpxchgw_le,
[MO_16 | MO_BE] = gen_helper_atomic_cmpxchgw_be,
[MO_32 | MO_LE] = gen_helper_atomic_cmpxchgl_le,
[MO_32 | MO_BE] = gen_helper_atomic_cmpxchgl_be,
- [MO_64 | MO_LE] = gen_helper_atomic_cmpxchgq_le,
- [MO_64 | MO_BE] = gen_helper_atomic_cmpxchgq_be,
+ WITH_ATOMIC64([MO_64 | MO_LE] = gen_helper_atomic_cmpxchgq_le)
+ WITH_ATOMIC64([MO_64 | MO_BE] = gen_helper_atomic_cmpxchgq_be)
};
void tcg_gen_atomic_cmpxchg_i32(TCGv_i32 retv, TCGv addr, TCGv_i32 cmpv,
@@ -2117,6 +2123,7 @@ void tcg_gen_atomic_cmpxchg_i64(TCGv_i64 retv, TCGv addr,
TCGv_i64 cmpv,
}
tcg_temp_free_i64(t1);
} else if ((memop & MO_SIZE) == MO_64) {
+#ifdef CONFIG_ATOMIC64
gen_atomic_cx_i64 gen;
gen = table_cmpxchg[memop & (MO_SIZE | MO_BSWAP)];
@@ -2131,6 +2138,9 @@ void tcg_gen_atomic_cmpxchg_i64(TCGv_i64 retv, TCGv addr,
TCGv_i64 cmpv,
#else
gen(retv, tcg_ctx.tcg_env, addr, cmpv, newv);
#endif
+#else
+ gen_helper_exit_atomic(tcg_ctx.tcg_env);
+#endif /* CONFIG_ATOMIC64 */
} else {
TCGv_i32 c32 = tcg_temp_new_i32();
TCGv_i32 n32 = tcg_temp_new_i32();
@@ -2218,6 +2228,7 @@ static void do_atomic_op_i64(TCGv_i64 ret, TCGv addr,
TCGv_i64 val,
memop = tcg_canonicalize_memop(memop, 1, 0);
if ((memop & MO_SIZE) == MO_64) {
+#ifdef CONFIG_ATOMIC64
gen_atomic_op_i64 gen;
gen = table[memop & (MO_SIZE | MO_BSWAP)];
@@ -2232,6 +2243,9 @@ static void do_atomic_op_i64(TCGv_i64 ret, TCGv addr,
TCGv_i64 val,
#else
gen(ret, tcg_ctx.tcg_env, addr, val);
#endif
+#else
+ gen_helper_exit_atomic(tcg_ctx.tcg_env);
+#endif /* CONFIG_ATOMIC64 */
} else {
TCGv_i32 v32 = tcg_temp_new_i32();
TCGv_i32 r32 = tcg_temp_new_i32();
@@ -2256,8 +2270,8 @@ static void * const table_##NAME[16] = {
\
[MO_16 | MO_BE] = gen_helper_atomic_##NAME##w_be, \
[MO_32 | MO_LE] = gen_helper_atomic_##NAME##l_le, \
[MO_32 | MO_BE] = gen_helper_atomic_##NAME##l_be, \
- [MO_64 | MO_LE] = gen_helper_atomic_##NAME##q_le, \
- [MO_64 | MO_BE] = gen_helper_atomic_##NAME##q_be, \
+ WITH_ATOMIC64([MO_64 | MO_LE] = gen_helper_atomic_##NAME##q_le) \
+ WITH_ATOMIC64([MO_64 | MO_BE] = gen_helper_atomic_##NAME##q_be) \
}; \
void tcg_gen_atomic_##NAME##_i32 \
(TCGv_i32 ret, TCGv addr, TCGv_i32 val, TCGArg idx, TCGMemOp memop) \
diff --git a/tcg/tcg-runtime.h b/tcg/tcg-runtime.h
index 22367aa..1deb86a 100644
--- a/tcg/tcg-runtime.h
+++ b/tcg/tcg-runtime.h
@@ -15,23 +15,28 @@ DEF_HELPER_FLAGS_2(sar_i64, TCG_CALL_NO_RWG_SE, s64, s64,
s64)
DEF_HELPER_FLAGS_2(mulsh_i64, TCG_CALL_NO_RWG_SE, s64, s64, s64)
DEF_HELPER_FLAGS_2(muluh_i64, TCG_CALL_NO_RWG_SE, i64, i64, i64)
+DEF_HELPER_FLAGS_1(exit_atomic, TCG_CALL_NO_WG, noreturn, env)
+
#ifdef CONFIG_SOFTMMU
DEF_HELPER_FLAGS_5(atomic_cmpxchgb, TCG_CALL_NO_WG,
i32, env, tl, i32, i32, i32)
DEF_HELPER_FLAGS_5(atomic_cmpxchgw_be, TCG_CALL_NO_WG,
i32, env, tl, i32, i32, i32)
-DEF_HELPER_FLAGS_5(atomic_cmpxchgl_be, TCG_CALL_NO_WG,
- i32, env, tl, i32, i32, i32)
-DEF_HELPER_FLAGS_5(atomic_cmpxchgq_be, TCG_CALL_NO_WG,
- i64, env, tl, i64, i64, i32)
DEF_HELPER_FLAGS_5(atomic_cmpxchgw_le, TCG_CALL_NO_WG,
i32, env, tl, i32, i32, i32)
+DEF_HELPER_FLAGS_5(atomic_cmpxchgl_be, TCG_CALL_NO_WG,
+ i32, env, tl, i32, i32, i32)
DEF_HELPER_FLAGS_5(atomic_cmpxchgl_le, TCG_CALL_NO_WG,
i32, env, tl, i32, i32, i32)
+#ifdef CONFIG_ATOMIC64
+DEF_HELPER_FLAGS_5(atomic_cmpxchgq_be, TCG_CALL_NO_WG,
+ i64, env, tl, i64, i64, i32)
DEF_HELPER_FLAGS_5(atomic_cmpxchgq_le, TCG_CALL_NO_WG,
i64, env, tl, i64, i64, i32)
+#endif
+#ifdef CONFIG_ATOMIC64
#define GEN_ATOMIC_HELPERS(NAME) \
DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), b), \
TCG_CALL_NO_WG, i32, env, tl, i32, i32) \
@@ -47,17 +52,33 @@ DEF_HELPER_FLAGS_5(atomic_cmpxchgq_le, TCG_CALL_NO_WG,
TCG_CALL_NO_WG, i64, env, tl, i64, i32) \
DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), q_be), \
TCG_CALL_NO_WG, i64, env, tl, i64, i32)
+#else
+#define GEN_ATOMIC_HELPERS(NAME) \
+ DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), b), \
+ TCG_CALL_NO_WG, i32, env, tl, i32, i32) \
+ DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), w_le), \
+ TCG_CALL_NO_WG, i32, env, tl, i32, i32) \
+ DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), w_be), \
+ TCG_CALL_NO_WG, i32, env, tl, i32, i32) \
+ DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), l_le), \
+ TCG_CALL_NO_WG, i32, env, tl, i32, i32) \
+ DEF_HELPER_FLAGS_4(glue(glue(atomic_, NAME), l_be), \
+ TCG_CALL_NO_WG, i32, env, tl, i32, i32)
+#endif /* CONFIG_ATOMIC64 */
#else
DEF_HELPER_FLAGS_4(atomic_cmpxchgb, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
DEF_HELPER_FLAGS_4(atomic_cmpxchgw_be, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
-DEF_HELPER_FLAGS_4(atomic_cmpxchgl_be, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
-DEF_HELPER_FLAGS_4(atomic_cmpxchgq_be, TCG_CALL_NO_WG, i64, env, tl, i64, i64)
DEF_HELPER_FLAGS_4(atomic_cmpxchgw_le, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
+DEF_HELPER_FLAGS_4(atomic_cmpxchgl_be, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
DEF_HELPER_FLAGS_4(atomic_cmpxchgl_le, TCG_CALL_NO_WG, i32, env, tl, i32, i32)
+#ifdef CONFIG_ATOMIC64
+DEF_HELPER_FLAGS_4(atomic_cmpxchgq_be, TCG_CALL_NO_WG, i64, env, tl, i64, i64)
DEF_HELPER_FLAGS_4(atomic_cmpxchgq_le, TCG_CALL_NO_WG, i64, env, tl, i64, i64)
+#endif
+#ifdef CONFIG_ATOMIC64
#define GEN_ATOMIC_HELPERS(NAME) \
DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), b), \
TCG_CALL_NO_WG, i32, env, tl, i32) \
@@ -73,6 +94,19 @@ DEF_HELPER_FLAGS_4(atomic_cmpxchgq_le, TCG_CALL_NO_WG, i64,
env, tl, i64, i64)
TCG_CALL_NO_WG, i64, env, tl, i64) \
DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), q_be), \
TCG_CALL_NO_WG, i64, env, tl, i64)
+#else
+#define GEN_ATOMIC_HELPERS(NAME) \
+ DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), b), \
+ TCG_CALL_NO_WG, i32, env, tl, i32) \
+ DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), w_le), \
+ TCG_CALL_NO_WG, i32, env, tl, i32) \
+ DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), w_be), \
+ TCG_CALL_NO_WG, i32, env, tl, i32) \
+ DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), l_le), \
+ TCG_CALL_NO_WG, i32, env, tl, i32) \
+ DEF_HELPER_FLAGS_3(glue(glue(atomic_, NAME), l_be), \
+ TCG_CALL_NO_WG, i32, env, tl, i32)
+#endif /* CONFIG_ATOMIC64 */
#endif /* CONFIG_SOFTMMU */
diff --git a/tcg/tcg.h b/tcg/tcg.h
index bc3ea7a..b34b5fb 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -1204,14 +1204,23 @@ TYPE helper_atomic_ ## NAME ## SUFFIX ## _mmu \
(CPUArchState *env, target_ulong addr, TYPE val, \
TCGMemOpIdx oi, uintptr_t retaddr);
+#ifdef CONFIG_ATOMIC64
#define GEN_ATOMIC_HELPER_ALL(NAME) \
- GEN_ATOMIC_HELPER(NAME, uint32_t, b) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, b) \
GEN_ATOMIC_HELPER(NAME, uint32_t, w_le) \
- GEN_ATOMIC_HELPER(NAME, uint32_t, l_le) \
- GEN_ATOMIC_HELPER(NAME, uint64_t, q_le) \
GEN_ATOMIC_HELPER(NAME, uint32_t, w_be) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, l_le) \
GEN_ATOMIC_HELPER(NAME, uint32_t, l_be) \
+ GEN_ATOMIC_HELPER(NAME, uint64_t, q_le) \
GEN_ATOMIC_HELPER(NAME, uint64_t, q_be)
+#else
+#define GEN_ATOMIC_HELPER_ALL(NAME) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, b) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, w_le) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, w_be) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, l_le) \
+ GEN_ATOMIC_HELPER(NAME, uint32_t, l_be)
+#endif
GEN_ATOMIC_HELPER_ALL(fetch_add)
GEN_ATOMIC_HELPER_ALL(fetch_sub)
--
2.7.4
