mono/metadata/sgen-os-mach.c

   1 /*
   2  * sgen-os-mach.c: Mach-OS support.
   3  *
   4  * Author:
   5  *      Paolo Molaro (lupus@ximian.com)
   6  *      Mark Probst (mprobst@novell.com)
   7  *      Geoff Norton (gnorton@novell.com)
   8  *
   9  * Copyright 2010 Novell, Inc (http://www.novell.com)
  10  * Copyright (C) 2012 Xamarin Inc
  11  *
  12  * Licensed under the MIT license. See LICENSE file in the project root for full license information.
  13  */
  14
  15 #include "config.h"
  16 #ifdef HAVE_SGEN_GC
  17
  18
  19 #include <glib.h>
  20 #include "sgen/sgen-gc.h"
  21 #include "sgen/sgen-archdep.h"
  22 #include "sgen/sgen-protocol.h"
  23 #include "sgen/sgen-thread-pool.h"
  24 #include "metadata/object-internals.h"
  25 #include "metadata/gc-internals.h"
  26
  27 #if defined(__MACH__)
  28 #include "utils/mach-support.h"
  29 #endif
  30
  31 #if defined(__MACH__) && MONO_MACH_ARCH_SUPPORTED
  32
  33 #if !defined(USE_COOP_GC)
  34 gboolean
  35 sgen_resume_thread (SgenThreadInfo *info)
  36 {
  37         return thread_resume (info->client_info.info.native_handle) == KERN_SUCCESS;
  38 }
  39
  40 gboolean
  41 sgen_suspend_thread (SgenThreadInfo *info)
  42 {
  43         mach_msg_type_number_t num_state;
  44         thread_state_t state;
  45         kern_return_t ret;
  46         ucontext_t ctx;
  47         mcontext_t mctx;
  48
  49         gpointer stack_start;
  50
  51         state = (thread_state_t) alloca (mono_mach_arch_get_thread_state_size ());
  52         mctx = (mcontext_t) alloca (mono_mach_arch_get_mcontext_size ());
  53
  54         ret = thread_suspend (info->client_info.info.native_handle);
  55         if (ret != KERN_SUCCESS)
  56                 return FALSE;
  57
  58         ret = mono_mach_arch_get_thread_state (info->client_info.info.native_handle, state, &num_state);
  59         if (ret != KERN_SUCCESS)
  60                 return FALSE;
  61
  62         mono_mach_arch_thread_state_to_mcontext (state, mctx);
  63         ctx.uc_mcontext = mctx;
  64
  65         info->client_info.stopped_domain = mono_thread_info_tls_get (info, TLS_KEY_DOMAIN);
  66         info->client_info.stopped_ip = (gpointer) mono_mach_arch_get_ip (state);
  67         info->client_info.stack_start = NULL;
  68         stack_start = (char*) mono_mach_arch_get_sp (state) - REDZONE_SIZE;
  69         /* If stack_start is not within the limits, then don't set it in info and we will be restarted. */
  70         if (stack_start >= info->client_info.stack_start_limit && stack_start <= info->client_info.stack_end) {
  71                 info->client_info.stack_start = stack_start;
  72
  73 #ifdef USE_MONO_CTX
  74                 mono_sigctx_to_monoctx (&ctx, &info->client_info.ctx);
  75 #else
  76                 ARCH_COPY_SIGCTX_REGS (&info->client_info.regs, &ctx);
  77 #endif
  78         } else {
  79                 g_assert (!info->client_info.stack_start);
  80         }
  81
  82         /* Notify the JIT */
  83         if (mono_gc_get_gc_callbacks ()->thread_suspend_func)
  84                 mono_gc_get_gc_callbacks ()->thread_suspend_func (info->client_info.runtime_data, &ctx, NULL);
  85
  86         SGEN_LOG (2, "thread %p stopped at %p stack_start=%p", (void*)(gsize)info->client_info.info.native_handle, info->client_info.stopped_ip, info->client_info.stack_start);
  87         binary_protocol_thread_suspend ((gpointer)mono_thread_info_get_tid (info), info->client_info.stopped_ip);
  88
  89         return TRUE;
  90 }
  91
  92 void
  93 sgen_wait_for_suspend_ack (int count)
  94 {
  95     /* mach thread_resume is synchronous so we dont need to wait for them */
  96 }
  97
  98 /* LOCKING: assumes the GC lock is held */
  99 int
 100 sgen_thread_handshake (BOOL suspend)
 101 {
 102         SgenThreadInfo *cur_thread = mono_thread_info_current ();
 103         kern_return_t ret;
 104
 105         int count = 0;
 106
 107         cur_thread->client_info.suspend_done = TRUE;
 108         FOREACH_THREAD (info) {
 109                 if (info == cur_thread || sgen_thread_pool_is_thread_pool_thread (mono_thread_info_get_tid (info)))
 110                         continue;
 111
 112                 info->client_info.suspend_done = FALSE;
 113                 if (info->client_info.gc_disabled)
 114                         continue;
 115
 116                 if (suspend) {
 117                         if (!sgen_suspend_thread (info))
 118                                 continue;
 119                 } else {
 120                         ret = thread_resume (info->client_info.info.native_handle);
 121                         if (ret != KERN_SUCCESS)
 122                                 continue;
 123                 }
 124                 count ++;
 125         } FOREACH_THREAD_END
 126         return count;
 127 }
 128
 129 void
 130 sgen_os_init (void)
 131 {
 132 }
 133
 134 int
 135 mono_gc_get_suspend_signal (void)
 136 {
 137         return -1;
 138 }
 139
 140 int
 141 mono_gc_get_restart_signal (void)
 142 {
 143         return -1;
 144 }
 145 #endif
 146 #endif
 147 #endif