/* * mach-support-x86.c: mach support for x86 * * Authors: * Geoff Norton (gnorton@novell.com) * Rodrigo Kumpera (kumpera@gmail.com) * * (C) 2010 Novell, Inc. * (C) 2013 Xamarin, Inc. */ #include #if defined(__MACH__) #include #include #include #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) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; return (void *) arch_state->__rip; } void * mono_mach_arch_get_sp (thread_state_t state) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; return (void *) arch_state->__rsp; } int mono_mach_arch_get_mcontext_size () { return sizeof (struct __darwin_mcontext64); } void 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; ctx->__ss = *arch_state; } void 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; *arch_state = ctx->__ss; } int mono_mach_arch_get_thread_state_size () { return sizeof (x86_thread_state64_t); } kern_return_t mono_mach_arch_get_thread_state (thread_port_t thread, thread_state_t state, mach_msg_type_number_t *count) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; kern_return_t ret; *count = x86_THREAD_STATE64_COUNT; ret = thread_get_state (thread, x86_THREAD_STATE64, (thread_state_t) arch_state, count); return ret; } kern_return_t mono_mach_arch_set_thread_state (thread_port_t thread, thread_state_t state, mach_msg_type_number_t count) { return thread_set_state (thread, x86_THREAD_STATE64, state, count); } void * 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 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 + tls_vector_offset); return (void *) &tsd [key]; } void * mono_mach_arch_get_tls_value_from_thread (pthread_t thread, guint32 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