Merge pull request #4048 from kumpera/iface_casting_cleanup

[mono.git] / mono / mini / mini-arm-tls.h

diff --git a/mono/mini/mini-arm-tls.h b/mono/mini/mini-arm-tls.h
index 30b2494dfc70c21ad396339e5e8cec5f8c86af6f..3fa4bef20620202cd3a6348f87101802f6d5a886 100644 (file)
--- a/mono/mini/mini-arm-tls.h
+++ b/mono/mini/mini-arm-tls.h
@@ -5,6 +5,8 @@
 
 int mono_fast_get_tls_key (int);
 void mono_fast_set_tls_key (int, int);
+int mono_fast_get_tls_key2 (int);
+void mono_fast_set_tls_key2 (int, int);
 
 /* Fallback tls getters/setters */
 
@@ -15,5 +17,103 @@ void mono_fallback_set_tls_key (int, int);
 
 void mono_fast_get_tls_key_end (void);
 void mono_fast_set_tls_key_end (void);
+void mono_fast_get_tls_key2_end (void);
+void mono_fast_set_tls_key2_end (void);
 
+#if defined(__linux__) && defined(HAVE_KW_THREAD) && defined(__ARM_EABI__)
+void* __aeabi_read_tp (void);
+#endif
+
+/* Structure that maps a possible  tls implementation to the corresponding thunks */
+typedef struct {
+       guint32 *expected_code;
+       int expected_code_length;
+       gboolean check_kernel_helper;
+       gpointer get_tls_thunk;
+       gpointer get_tls_thunk_end;
+       gpointer set_tls_thunk;
+       gpointer set_tls_thunk_end;
+} MonoTlsImplementation;
+
+
+static MonoTlsImplementation known_tls_implementations [] = {
+#if defined(HAVE_KW_THREAD) && defined(__linux__) && defined(__ARM_EABI__)
+       { (guint32[]) {0x0f70ee1d, 0xbf004770}, 8, FALSE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end },
+       { (guint32[]) {0xe3e00a0f, 0xe240f01f}, 8, TRUE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end }
+#elif defined(TARGET_IOS)
+       { (guint32[]) {0x1f70ee1d, 0x0103f021, 0x0020f851, 0xbf004770}, 16, FALSE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end }
+#elif defined(TARGET_ANDROID)
+       { (guint32[]) {0xe2403003, 0xe353003c, 0xe92d4010, 0xe1a04000, 0x9a000001, 0xe3a00000, 0xe8bd8010, 0xe3e00a0f, 0xe240101f, 0xe12fff31, 0xe7900104, 0xe8bd8010}, 48, TRUE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end}, /* 1.5 */
+       { (guint32[]) {0xe2402003, 0xe1a03000, 0xe352003c, 0x8a000002, 0xee1d0f70, 0xe7900103, 0xe12fff1e}, 28, FALSE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end}, /* 4.2 */
+       { (guint32[]) {0xe2403007, 0xe3530084, 0x8a000002, 0xee1d1f70, 0xe7910100, 0xe12fff1e, 0xe3a00000, 0xe12fff1e}, 32, FALSE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end}, /* 4.4 */
+       { (guint32[]) {0x2b8c1fc3, 0xee1dd804, 0xf8511f70, 0x47700020, 0x47702000}, 20, FALSE, mono_fast_get_tls_key, mono_fast_get_tls_key_end, mono_fast_set_tls_key, mono_fast_set_tls_key_end}, /* 5.0 */
+       { (guint32[]) {0xb5104b0f, 0xda114298, 0xf020490e, 0xee1d4000, 0x00c24f70, 0xf8514479, 0x68631030, 0xd50707cc, 0x6e54441a, 0xd103428c, 0xbd106e90}, 44, FALSE, mono_fast_get_tls_key2, mono_fast_get_tls_key2_end, mono_fast_set_tls_key2, mono_fast_set_tls_key2_end} /* 6.0 */
+#endif
+};
+
+static gboolean
+known_kernel_helper (void)
+{
+#ifdef __linux__
+       const guint32* kuser_get_tls = (void*)0xffff0fe0; /* linux kernel user helper on arm */
+       guint32 expected [] = {0xee1d0f70, 0xe12fff1e};
+
+       /* Expecting mrc + bx lr in the kuser_get_tls kernel helper */
+       return memcmp (kuser_get_tls, expected, 8) == 0;
+#else
+       g_error ("Trying to check linux kernel helper on non linux platform"); 
+       return FALSE;
+#endif
+}
+
+static void
+dump_code (guint32 *ptr)
+{
+       char current_impl [256];
+       char hex [16];
+       int i;
+       guint32 page_mask = ~((guint32)mono_pagesize () - 1);
+
+       current_impl [0] = 0;
+       for (i = 0; i < 16; i++) {
+               /* Don't risk page fault since we don't know where the code ends */
+               if (((guint32)&ptr [i] & page_mask) != ((guint32)ptr & page_mask))
+                       break;
+               sprintf (hex, "0x%x ", ptr [i]);
+               strcat (current_impl, hex);
+       }
+
+       g_warning (current_impl);
+}
+
+static MonoTlsImplementation
+mono_arm_get_tls_implementation (void)
+{
+#ifdef MONO_CROSS_COMPILE
+       g_assert_not_reached ();
+#else
+       /* Discard thumb bit */
+#if defined(__linux__) && defined(HAVE_KW_THREAD) && defined(__ARM_EABI__)
+       guint32* check_addr = (guint32*) ((guint32)__aeabi_read_tp & 0xfffffffe);
+#else
+       guint32* check_addr = (guint32*) ((guint32)pthread_getspecific & 0xfffffffe);
+#endif
+       int i;
+
+       if (!mini_get_debug_options ()->arm_use_fallback_tls) {
+               for (i = 0; i < sizeof (known_tls_implementations) / sizeof (MonoTlsImplementation); i++) {
+                       if (memcmp (check_addr, known_tls_implementations [i].expected_code, known_tls_implementations [i].expected_code_length) == 0) {
+                               if ((known_tls_implementations [i].check_kernel_helper && known_kernel_helper ()) ||
+                                               !known_tls_implementations [i].check_kernel_helper)
+                                       return known_tls_implementations [i];
+                       }
+               }
+       }
+
+       g_warning ("No fast tls on device. Using fallbacks. Current implementation : ");
+       dump_code (check_addr);
+
+       return (MonoTlsImplementation) { NULL, 0, FALSE, mono_fallback_get_tls_key, NULL, mono_fallback_set_tls_key, NULL };
+#endif
+}
 #endif