*
* Authors:
* Geoff Norton (gnorton@novell.com)
+ * Rodrigo Kumpera (kumpera@gmail.com)
*
* (C) 2010 Novell, Inc.
+ * (C) 2013 Xamarin, Inc.
*/
#include <config.h>
#include "utils/mono-sigcontext.h"
#include "mach-support.h"
+/* Known offsets used for TLS storage*/
+
+/* All OSX versions up to 10.8 */
+#define TLS_VECTOR_OFFSET_CATS 0x60
+#define TLS_VECTOR_OFFSET_10_9 0xe0
+
+static int tls_vector_offset;
+
void *
mono_mach_arch_get_ip (thread_state_t state)
{
}
void
-mono_mach_arch_thread_state_to_mcontext (thread_state_t state, mcontext_t context)
+mono_mach_arch_thread_state_to_mcontext (thread_state_t state, void *context)
{
x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context;
}
void
-mono_mach_arch_mcontext_to_thread_state (mcontext_t context, thread_state_t state)
+mono_mach_arch_mcontext_to_thread_state (void *context, thread_state_t state)
{
x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context;
mono_mach_get_tls_address_from_thread (pthread_t thread, pthread_key_t key)
{
/* OSX stores TLS values in a hidden array inside the pthread_t structure
- * They are keyed off a giant array offset 0x60 into the pointer. This value
+ * They are keyed off a giant array from a known offset into the pointer. This value
* is baked into their pthread_getspecific implementation
*/
intptr_t *p = (intptr_t *)thread;
- intptr_t **tsd = (intptr_t **) ((char*)p + 0x60);
+ intptr_t **tsd = (intptr_t **) ((char*)p + tls_vector_offset);
return (void *) &tsd [key];
}
return *(void**)mono_mach_get_tls_address_from_thread (thread, key);
}
+void
+mono_mach_init (pthread_key_t key)
+{
+ void *old_value = pthread_getspecific (key);
+ void *canary = (void*)0xDEADBEEFu;
+
+ pthread_key_create (&key, NULL);
+ g_assert (old_value != canary);
+
+ pthread_setspecific (key, canary);
+
+ /*First we probe for cats*/
+ tls_vector_offset = TLS_VECTOR_OFFSET_CATS;
+ if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
+ goto ok;
+
+ tls_vector_offset = TLS_VECTOR_OFFSET_10_9;
+ if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
+ goto ok;
+
+ g_error ("could not discover the mach TLS offset");
+ok:
+ pthread_setspecific (key, old_value);
+}
+
#endif