tcg: Toggle page execution for Apple Silicon

Pages can't be both write and executable at the same time on Apple
Silicon. macOS provides public API to switch write protection [1] for
JIT applications, like TCG.

1. https://developer.apple.com/documentation/apple_silicon/porting_just-in-time_compilers_to_apple_silicon

Tested-by: Alexander Graf <agraf@csgraf.de>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20210113032806.18220-1-r.bolshakov@yadro.com>
[rth: Inline the qemu_thread_jit_* functions;
 drop the MAP_JIT change for a follow-on patch.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/cpu-exec.c

@@ -186,6 +186,7 @@ cpu_tb_exec(CPUState *cpu, TranslationBlock *itb, int *tb_exit)
     }
 #endif /* DEBUG_DISAS */
 
+    qemu_thread_jit_execute();
     ret = tcg_qemu_tb_exec(env, tb_ptr);
     cpu->can_do_io = 1;
     /*
@@ -410,6 +411,7 @@ static inline void tb_add_jump(TranslationBlock *tb, int n,
 {
     uintptr_t old;
 
+    qemu_thread_jit_write();
     assert(n < ARRAY_SIZE(tb->jmp_list_next));
     qemu_spin_lock(&tb_next->jmp_lock);
 

accel/tcg/translate-all.c

@@ -1670,7 +1670,9 @@ static void do_tb_phys_invalidate(TranslationBlock *tb, bool rm_from_page_list)
 
 static void tb_phys_invalidate__locked(TranslationBlock *tb)
 {
+    qemu_thread_jit_write();
     do_tb_phys_invalidate(tb, true);
+    qemu_thread_jit_execute();
 }
 
 /* invalidate one TB
@@ -1872,6 +1874,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
 #endif
 
     assert_memory_lock();
+    qemu_thread_jit_write();
 
     phys_pc = get_page_addr_code(env, pc);
 

include/qemu/osdep.h

@@ -119,6 +119,10 @@ extern int daemon(int, int);
 #include "sysemu/os-posix.h"
 #endif
 
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+#endif
+
 #include "glib-compat.h"
 #include "qemu/typedefs.h"
 
@@ -682,4 +686,28 @@ char *qemu_get_host_name(Error **errp);
  */
 size_t qemu_get_host_physmem(void);
 
+/*
+ * Toggle write/execute on the pages marked MAP_JIT
+ * for the current thread.
+ */
+#if defined(MAC_OS_VERSION_11_0) && \
+    MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0
+static inline void qemu_thread_jit_execute(void)
+{
+    if (__builtin_available(macOS 11.0, *)) {
+        pthread_jit_write_protect_np(true);
+    }
+}
+
+static inline void qemu_thread_jit_write(void)
+{
+    if (__builtin_available(macOS 11.0, *)) {
+        pthread_jit_write_protect_np(false);
+    }
+}
+#else
+static inline void qemu_thread_jit_write(void) {}
+static inline void qemu_thread_jit_execute(void) {}
+#endif
+
 #endif

tcg/tcg.c

@@ -1112,6 +1112,7 @@ void tcg_prologue_init(TCGContext *s)
     s->pool_labels = NULL;
 #endif
 
+    qemu_thread_jit_write();
     /* Generate the prologue.  */
     tcg_target_qemu_prologue(s);