accel/tcg: Split out accel/tcg/helper-retaddr.h

Move set_helper_retaddr and clear_helper_retaddr
to a new header file.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/cpu-exec.c

@@ -24,6 +24,7 @@
 #include "hw/core/cpu.h"
 #include "accel/tcg/cpu-ldst.h"
 #include "accel/tcg/cpu-ops.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "trace.h"
 #include "disas/disas.h"
 #include "exec/cpu-common.h"

accel/tcg/user-exec.c

@@ -26,6 +26,7 @@
 #include "qemu/bitops.h"
 #include "qemu/rcu.h"
 #include "accel/tcg/cpu-ldst.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "accel/tcg/probe.h"
 #include "user/cpu_loop.h"
 #include "qemu/main-loop.h"

include/accel/tcg/cpu-ldst.h

@@ -526,38 +526,4 @@ void *tlb_vaddr_to_host(CPUArchState *env, vaddr addr,
                         MMUAccessType access_type, int mmu_idx);
 #endif
 
-/*
- * For user-only, helpers that use guest to host address translation
- * must protect the actual host memory access by recording 'retaddr'
- * for the signal handler.  This is required for a race condition in
- * which another thread unmaps the page between a probe and the
- * actual access.
- */
-#ifdef CONFIG_USER_ONLY
-extern __thread uintptr_t helper_retaddr;
-
-static inline void set_helper_retaddr(uintptr_t ra)
-{
-    helper_retaddr = ra;
-    /*
-     * Ensure that this write is visible to the SIGSEGV handler that
-     * may be invoked due to a subsequent invalid memory operation.
-     */
-    signal_barrier();
-}
-
-static inline void clear_helper_retaddr(void)
-{
-    /*
-     * Ensure that previous memory operations have succeeded before
-     * removing the data visible to the signal handler.
-     */
-    signal_barrier();
-    helper_retaddr = 0;
-}
-#else
-#define set_helper_retaddr(ra)   do { } while (0)
-#define clear_helper_retaddr()   do { } while (0)
-#endif
-
 #endif /* ACCEL_TCG_CPU_LDST_H */

include/accel/tcg/helper-retaddr.h

@@ -0,0 +1,43 @@
+/*
+ * Get user helper pc for memory unwinding.
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ */
+
+#ifndef ACCEL_TCG_HELPER_RETADDR_H
+#define ACCEL_TCG_HELPER_RETADDR_H
+
+/*
+ * For user-only, helpers that use guest to host address translation
+ * must protect the actual host memory access by recording 'retaddr'
+ * for the signal handler.  This is required for a race condition in
+ * which another thread unmaps the page between a probe and the
+ * actual access.
+ */
+#ifdef CONFIG_USER_ONLY
+extern __thread uintptr_t helper_retaddr;
+
+static inline void set_helper_retaddr(uintptr_t ra)
+{
+    helper_retaddr = ra;
+    /*
+     * Ensure that this write is visible to the SIGSEGV handler that
+     * may be invoked due to a subsequent invalid memory operation.
+     */
+    signal_barrier();
+}
+
+static inline void clear_helper_retaddr(void)
+{
+    /*
+     * Ensure that previous memory operations have succeeded before
+     * removing the data visible to the signal handler.
+     */
+    signal_barrier();
+    helper_retaddr = 0;
+}
+#else
+#define set_helper_retaddr(ra)   do { } while (0)
+#define clear_helper_retaddr()   do { } while (0)
+#endif
+
+#endif /* ACCEL_TCG_HELPER_RETADDR_H */

target/arm/tcg/helper-a64.c

@@ -30,6 +30,7 @@
 #include "qemu/crc32c.h"
 #include "exec/cpu-common.h"
 #include "accel/tcg/cpu-ldst.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "accel/tcg/probe.h"
 #include "exec/target_page.h"
 #include "exec/tlb-flags.h"

target/arm/tcg/sme_helper.c

@@ -23,6 +23,7 @@
 #include "tcg/tcg-gvec-desc.h"
 #include "exec/helper-proto.h"
 #include "accel/tcg/cpu-ldst.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "qemu/int128.h"
 #include "fpu/softfloat.h"
 #include "vec_internal.h"

target/arm/tcg/sve_helper.c

@@ -30,6 +30,7 @@
 #include "vec_internal.h"
 #include "sve_ldst_internal.h"
 #include "accel/tcg/cpu-ldst.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "accel/tcg/cpu-ops.h"
 #include "accel/tcg/probe.h"
 #ifdef CONFIG_USER_ONLY

target/ppc/mem_helper.c

@@ -24,6 +24,7 @@
 #include "exec/helper-proto.h"
 #include "helper_regs.h"
 #include "accel/tcg/cpu-ldst.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "accel/tcg/probe.h"
 #include "internal.h"
 #include "qemu/atomic128.h"

target/s390x/tcg/mem_helper.c

@@ -32,6 +32,7 @@
 #include "exec/target_page.h"
 #include "exec/tlb-flags.h"
 #include "accel/tcg/cpu-ops.h"
+#include "accel/tcg/helper-retaddr.h"
 #include "qemu/int128.h"
 #include "qemu/atomic128.h"