void
mono_mach_init (pthread_key_t key)
{
int i;
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*/
for (i = 0; i < TLS_PROBE_COUNT; ++i) {
tls_vector_offset = known_tls_offsets [i];
if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
goto ok;
}
/*Fallback to scanning a large range of offsets*/
for (i = TLS_PROBE_LOW_WATERMARK; i <= TLS_PROBE_HIGH_WATERMARK; i += 4) {
tls_vector_offset = i;
if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary) {
g_warning ("Found new TLS offset at %d", i);
goto ok;
}
}
g_error ("could not discover the mach TLS offset");
ok:
pthread_setspecific (key, old_value);
}
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;
tls_vector_offset = TLS_VECTOR_OFFSET_10_11;
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);
}
gboolean
mono_thread_state_init_from_handle (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle)
{
kern_return_t ret;
mach_msg_type_number_t num_state;
thread_state_t state;
ucontext_t ctx;
mcontext_t mctx;
guint32 domain_key, jit_key;
MonoJitTlsData *jit_tls;
void *domain;
#if defined (MONO_ARCH_ENABLE_MONO_LMF_VAR)
guint32 lmf_key;
#endif
/*Zero enough state to make sure the caller doesn't confuse itself*/
tctx->valid = FALSE;
tctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = NULL;
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = NULL;
tctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = NULL;
state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
ret = mono_mach_arch_get_thread_state (thread_handle, state, &num_state);
if (ret != KERN_SUCCESS)
return FALSE;
mono_mach_arch_thread_state_to_mcontext (state, mctx);
ctx.uc_mcontext = mctx;
mono_sigctx_to_monoctx (&ctx, &tctx->ctx);
domain_key = mono_domain_get_tls_offset ();
jit_key = mono_get_jit_tls_key ();
jit_tls = mono_mach_arch_get_tls_value_from_thread (thread_id, jit_key);
domain = mono_mach_arch_get_tls_value_from_thread (thread_id, domain_key);
/*Thread already started to cleanup, can no longer capture unwind state*/
if (!jit_tls)
return FALSE;
g_assert (domain);
#if defined (MONO_ARCH_ENABLE_MONO_LMF_VAR)
lmf_key = mono_get_lmf_tls_offset ();
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = mono_mach_arch_get_tls_value_from_thread (thread_id, lmf_key);;
#else
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = jit_tls ? jit_tls->lmf : NULL;
#endif
tctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = domain;
tctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = jit_tls;
tctx->valid = TRUE;
return TRUE;
}
gboolean
mono_thread_state_init_from_handle (MonoThreadUnwindState *tctx, MonoNativeThreadId thread_id, MonoNativeThreadHandle thread_handle)
{
kern_return_t ret;
mach_msg_type_number_t num_state;
thread_state_t state;
ucontext_t ctx;
mcontext_t mctx;
guint32 domain_key, jit_key;
MonoJitTlsData *jit_tls;
void *domain;
state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
ret = mono_mach_arch_get_thread_state (thread_handle, state, &num_state);
if (ret != KERN_SUCCESS)
return FALSE;
mono_mach_arch_thread_state_to_mcontext (state, mctx);
ctx.uc_mcontext = mctx;
mono_sigctx_to_monoctx (&ctx, &tctx->ctx);
domain_key = mono_domain_get_tls_offset ();
jit_key = mono_pthread_key_for_tls (mono_get_jit_tls_key ());
jit_tls = mono_mach_arch_get_tls_value_from_thread (thread_id, jit_key);
domain = mono_mach_arch_get_tls_value_from_thread (thread_id, domain_key);
/*Thread already started to cleanup, can no longer capture unwind state*/
if (!jit_tls)
return FALSE;
g_assert (domain);
tctx->unwind_data [MONO_UNWIND_DATA_DOMAIN] = domain;
tctx->unwind_data [MONO_UNWIND_DATA_LMF] = jit_tls ? jit_tls->lmf : NULL;
tctx->unwind_data [MONO_UNWIND_DATA_JIT_TLS] = jit_tls;
tctx->valid = TRUE;
return TRUE;
}
gboolean
mono_sgen_suspend_thread (SgenThreadInfo *info)
{
mach_msg_type_number_t num_state;
thread_state_t state;
kern_return_t ret;
ucontext_t ctx;
mcontext_t mctx;
gpointer stack_start;
state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
ret = thread_suspend (info->mach_port);
if (ret != KERN_SUCCESS)
return FALSE;
ret = mono_mach_arch_get_thread_state (info->mach_port, state, &num_state);
if (ret != KERN_SUCCESS)
return FALSE;
mono_mach_arch_thread_state_to_mcontext (state, mctx);
ctx.uc_mcontext = mctx;
info->stopped_domain = mono_mach_arch_get_tls_value_from_thread ((pthread_t)info->id, mono_domain_get_tls_offset ());
info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
/* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
info->stack_start = stack_start;
#ifdef USE_MONO_CTX
mono_sigctx_to_monoctx (&ctx, &info->ctx);
info->monoctx = &info->ctx;
#else
ARCH_COPY_SIGCTX_REGS (&info->regs, &ctx);
info->stopped_regs = &info->regs;
#endif
} else {
g_assert (!info->stack_start);
}
/* Notify the JIT */
if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
mono_gc_get_gc_callbacks ()->thread_suspend_func (info->runtime_data, &ctx);
return TRUE;
}
int
mono_sgen_thread_handshake (int signum)
{
task_t task = current_task ();
thread_port_t cur_thread = mach_thread_self ();
thread_act_array_t thread_list;
mach_msg_type_number_t num_threads;
mach_msg_type_number_t num_state;
thread_state_t state;
kern_return_t ret;
ucontext_t ctx;
mcontext_t mctx;
pthread_t exception_thread = mono_gc_get_mach_exception_thread ();
SgenThreadInfo *info;
gpointer regs [ARCH_NUM_REGS];
gpointer stack_start;
int count, i;
mono_mach_get_threads (&thread_list, &num_threads);
for (i = 0, count = 0; i < num_threads; i++) {
thread_port_t t = thread_list [i];
pthread_t pt = pthread_from_mach_thread_np (t);
if (t != cur_thread && pt != exception_thread && !mono_sgen_is_worker_thread (pt)) {
if (signum == suspend_signal_num) {
ret = thread_suspend (t);
if (ret != KERN_SUCCESS) {
mach_port_deallocate (task, t);
continue;
}
state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
ret = mono_mach_arch_get_thread_state (t, state, &num_state);
if (ret != KERN_SUCCESS) {
mach_port_deallocate (task, t);
continue;
}
info = mono_sgen_thread_info_lookup (pt);
/* Ensure that the runtime is aware of this thread */
if (info != NULL) {
mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
mono_mach_arch_thread_state_to_mcontext (state, mctx);
ctx.uc_mcontext = mctx;
info->stopped_domain = mono_mach_arch_get_tls_value_from_thread (t, mono_pthread_key_for_tls (mono_domain_get_tls_key ()));
info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
/* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
info->stack_start = stack_start;
ARCH_COPY_SIGCTX_REGS (regs, &ctx);
info->stopped_regs = regs;
} else {
g_assert (!info->stack_start);
}
/* Notify the JIT */
if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
mono_gc_get_gc_callbacks ()->thread_suspend_func (info->runtime_data, &ctx);
}
} else {
ret = thread_resume (t);
if (ret != KERN_SUCCESS) {
mach_port_deallocate (task, t);
continue;
}
}
count ++;
mach_port_deallocate (task, t);
}
}
mach_port_deallocate (task, cur_thread);
return count;
}
int
mono_sgen_thread_handshake (int signum)
{
SgenThreadInfo *cur_thread = mono_sgen_thread_info_current ();
mach_msg_type_number_t num_state;
thread_state_t state;
kern_return_t ret;
ucontext_t ctx;
mcontext_t mctx;
SgenThreadInfo *info;
gpointer stack_start;
int count = 0;
state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
FOREACH_THREAD (info) {
if (info == cur_thread || mono_sgen_is_worker_thread (info->id))
continue;
if (signum == suspend_signal_num) {
ret = thread_suspend (info->mach_port);
if (ret != KERN_SUCCESS)
continue;
ret = mono_mach_arch_get_thread_state (info->mach_port, state, &num_state);
if (ret != KERN_SUCCESS)
continue;
mono_mach_arch_thread_state_to_mcontext (state, mctx);
ctx.uc_mcontext = mctx;
info->stopped_domain = mono_mach_arch_get_tls_value_from_thread ((pthread_t)info->id, mono_pthread_key_for_tls (mono_domain_get_tls_key ()));
info->stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
/* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
if (stack_start >= info->stack_start_limit && info->stack_start <= info->stack_end) {
info->stack_start = stack_start;
#ifdef USE_MONO_CTX
mono_sigctx_to_monoctx (&ctx, &info->ctx);
info->monoctx = &info->ctx;
#else
ARCH_COPY_SIGCTX_REGS (&info->regs, &ctx);
info->stopped_regs = &info->regs;
#endif
} else {
g_assert (!info->stack_start);
}
/* Notify the JIT */
if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
mono_gc_get_gc_callbacks ()->thread_suspend_func (info->runtime_data, &ctx);
} else {
ret = thread_resume (info->mach_port);
if (ret != KERN_SUCCESS)
continue;
}
count ++;
} END_FOREACH_THREAD
return count;
}
