tcg: Add atomic helpers

Add all of cmpxchg, op_fetch, fetch_op, and xchg.
Handle both endian-ness, and sizes up to 8.
Handle expanding non-atomically, when emulating in serial.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>

1 files changed, 38 insertions, 11 deletions

diff --git a/tcg-runtime.c b/tcg-runtime.c
index ea2ad649cb..aa55d12e12 100644
--- a/tcg-runtime.c
+++ b/tcg-runtime.c
@@ -23,17 +23,10 @@
  */
 #include "qemu/osdep.h"
 #include "qemu/host-utils.h"
-
-/* This file is compiled once, and thus we can't include the standard
-   "exec/helper-proto.h", which has includes that are target specific.  */
-
-#include "exec/helper-head.h"
-
-#define DEF_HELPER_FLAGS_2(name, flags, ret, t1, t2) \
-  dh_ctype(ret) HELPER(name) (dh_ctype(t1), dh_ctype(t2));
-
-#include "tcg-runtime.h"
-
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "exec/cpu_ldst.h"
+#include "exec/exec-all.h"
 
 /* 32-bit helpers */
 
@@ -107,3 +100,37 @@ int64_t HELPER(mulsh_i64)(int64_t arg1, int64_t arg2)
     muls64(&l, &h, arg1, arg2);
     return h;
 }
+
+#ifndef CONFIG_SOFTMMU
+/* The softmmu versions of these helpers are in cputlb.c.  */
+
+/* Do not allow unaligned operations to proceed.  Return the host address.  */
+static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
+                               int size, uintptr_t retaddr)
+{
+    /* Enforce qemu required alignment.  */
+    if (unlikely(addr & (size - 1))) {
+        cpu_loop_exit_atomic(ENV_GET_CPU(env), retaddr);
+    }
+    return g2h(addr);
+}
+
+/* Macro to call the above, with local variables from the use context.  */
+#define ATOMIC_MMU_LOOKUP  atomic_mmu_lookup(env, addr, DATA_SIZE, GETPC())
+
+#define ATOMIC_NAME(X)   HELPER(glue(glue(atomic_ ## X, SUFFIX), END))
+#define EXTRA_ARGS
+
+#define DATA_SIZE 1
+#include "atomic_template.h"
+
+#define DATA_SIZE 2
+#include "atomic_template.h"
+
+#define DATA_SIZE 4
+#include "atomic_template.h"
+
+#define DATA_SIZE 8
+#include "atomic_template.h"
+
+#endif /* !CONFIG_SOFTMMU */