mono/utils/mach-support-amd64.c

   1 /*
   2  * mach-support-x86.c: mach support for x86
   3  *
   4  * Authors:
   5  *   Geoff Norton (gnorton@novell.com)
   6  *   Rodrigo Kumpera (kumpera@gmail.com)
   7  *
   8  * (C) 2010 Novell, Inc.
   9  * (C) 2013 Xamarin, Inc.
  10  */
  11
  12 #include <config.h>
  13
  14 #if defined(__MACH__)
  15 #include <stdint.h>
  16 #include <glib.h>
  17 #include <pthread.h>
  18 #include "utils/mono-sigcontext.h"
  19 #include "mach-support.h"
  20
  21 //For reg numbers
  22 #include <mono/arch/amd64/amd64-codegen.h>
  23
  24 /* Known offsets used for TLS storage*/
  25
  26 /* All OSX versions up to 10.8 */
  27 #define TLS_VECTOR_OFFSET_CATS 0x60
  28 #define TLS_VECTOR_OFFSET_10_9 0xe0
  29 #define TLS_VECTOR_OFFSET_10_11 0x100
  30
  31 /* This is 2 slots less than the known low */
  32 #define TLS_PROBE_LOW_WATERMARK 0x50
  33 /* This is 28 slots above the know high, which is more than the known high-low*/
  34 #define TLS_PROBE_HIGH_WATERMARK 0x200
  35
  36
  37 static int tls_vector_offset;
  38
  39 void *
  40 mono_mach_arch_get_ip (thread_state_t state)
  41 {
  42         x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
  43
  44         return (void *) arch_state->__rip;
  45 }
  46
  47 void *
  48 mono_mach_arch_get_sp (thread_state_t state)
  49 {
  50         x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
  51
  52         return (void *) arch_state->__rsp;
  53 }
  54
  55 int
  56 mono_mach_arch_get_mcontext_size ()
  57 {
  58         return sizeof (struct __darwin_mcontext64);
  59 }
  60
  61 void
  62 mono_mach_arch_thread_states_to_mcontext (thread_state_t state, thread_state_t fpstate, void *context)
  63 {
  64         x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
  65         x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate;
  66         struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context;
  67         ctx->__ss = *arch_state;
  68         ctx->__fs = *arch_fpstate;
  69 }
  70
  71 void
  72 mono_mach_arch_mcontext_to_thread_states (void *context, thread_state_t state, thread_state_t fpstate)
  73 {
  74         x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
  75         x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate;
  76         struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context;
  77         *arch_state = ctx->__ss;
  78         *arch_fpstate = ctx->__fs;
  79 }
  80
  81 void
  82 mono_mach_arch_thread_states_to_mono_context (thread_state_t state, thread_state_t fpstate, MonoContext *context)
  83 {
  84         x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state;
  85         x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate;
  86         context->gregs [AMD64_RAX] = arch_state->__rax;
  87         context->gregs [AMD64_RBX] = arch_state->__rbx;
  88         context->gregs [AMD64_RCX] = arch_state->__rcx;
  89         context->gregs [AMD64_RDX] = arch_state->__rdx;
  90         context->gregs [AMD64_RDI] = arch_state->__rdi;
  91         context->gregs [AMD64_RBP] = arch_state->__rbp;
  92         context->gregs [AMD64_RSP] = arch_state->__rsp;
  93         context->gregs [AMD64_R8] = arch_state->__r8;
  94         context->gregs [AMD64_R9] = arch_state->__r9;
  95         context->gregs [AMD64_R10] = arch_state->__r10;
  96         context->gregs [AMD64_R11] = arch_state->__r11;
  97         context->gregs [AMD64_R12] = arch_state->__r12;
  98         context->gregs [AMD64_R13] = arch_state->__r13;
  99         context->gregs [AMD64_R14] = arch_state->__r14;
 100         context->gregs [AMD64_R15] = arch_state->__r15;
 101         context->gregs [AMD64_RIP] = arch_state->__rip;
 102         context->fregs [AMD64_XMM0] = arch_fpstate->__fpu_xmm0;
 103         context->fregs [AMD64_XMM1] = arch_fpstate->__fpu_xmm1;
 104         context->fregs [AMD64_XMM2] = arch_fpstate->__fpu_xmm2;
 105         context->fregs [AMD64_XMM3] = arch_fpstate->__fpu_xmm3;
 106         context->fregs [AMD64_XMM4] = arch_fpstate->__fpu_xmm4;
 107         context->fregs [AMD64_XMM5] = arch_fpstate->__fpu_xmm5;
 108         context->fregs [AMD64_XMM6] = arch_fpstate->__fpu_xmm6;
 109         context->fregs [AMD64_XMM7] = arch_fpstate->__fpu_xmm7;
 110         context->fregs [AMD64_XMM8] = arch_fpstate->__fpu_xmm8;
 111         context->fregs [AMD64_XMM9] = arch_fpstate->__fpu_xmm9;
 112         context->fregs [AMD64_XMM10] = arch_fpstate->__fpu_xmm10;
 113         context->fregs [AMD64_XMM11] = arch_fpstate->__fpu_xmm11;
 114         context->fregs [AMD64_XMM12] = arch_fpstate->__fpu_xmm12;
 115         context->fregs [AMD64_XMM13] = arch_fpstate->__fpu_xmm13;
 116         context->fregs [AMD64_XMM14] = arch_fpstate->__fpu_xmm14;
 117         context->fregs [AMD64_XMM15] = arch_fpstate->__fpu_xmm15;
 118 }
 119
 120 int
 121 mono_mach_arch_get_thread_state_size ()
 122 {
 123         return sizeof (x86_thread_state64_t);
 124 }
 125
 126 int
 127 mono_mach_arch_get_thread_fpstate_size ()
 128 {
 129         return sizeof (x86_float_state64_t);
 130 }
 131
 132 kern_return_t
 133 mono_mach_arch_get_thread_states (thread_port_t thread, thread_state_t state, mach_msg_type_number_t *count, thread_state_t fpstate, mach_msg_type_number_t *fpcount)
 134 {
 135         x86_thread_state64_t *arch_state = (x86_thread_state64_t *)state;
 136         x86_float_state64_t *arch_fpstate = (x86_float_state64_t *)fpstate;
 137         kern_return_t ret;
 138
 139         *count = x86_THREAD_STATE64_COUNT;
 140         *fpcount = x86_FLOAT_STATE64_COUNT;
 141
 142         ret = thread_get_state (thread, x86_THREAD_STATE64, (thread_state_t)arch_state, count);
 143         if (ret != KERN_SUCCESS)
 144                 return ret;
 145
 146         ret = thread_get_state (thread, x86_FLOAT_STATE64, (thread_state_t)arch_fpstate, fpcount);
 147         return ret;
 148 }
 149
 150 kern_return_t
 151 mono_mach_arch_set_thread_states (thread_port_t thread, thread_state_t state, mach_msg_type_number_t count, thread_state_t fpstate, mach_msg_type_number_t fpcount)
 152 {
 153         kern_return_t ret;
 154         ret = thread_set_state (thread, x86_THREAD_STATE64, state, count);
 155         if (ret != KERN_SUCCESS)
 156                 return ret;
 157         ret = thread_set_state (thread, x86_FLOAT_STATE64, fpstate, fpcount);
 158         return ret;
 159 }
 160
 161 void *
 162 mono_mach_get_tls_address_from_thread (pthread_t thread, pthread_key_t key)
 163 {
 164         /* OSX stores TLS values in a hidden array inside the pthread_t structure
 165          * They are keyed off a giant array from a known offset into the pointer.  This value
 166          * is baked into their pthread_getspecific implementation
 167          */
 168         intptr_t *p = (intptr_t *)thread;
 169         intptr_t **tsd = (intptr_t **) ((char*)p + tls_vector_offset);
 170         g_assert (tls_vector_offset != -1);
 171
 172         return (void *) &tsd [key];
 173 }
 174
 175 void *
 176 mono_mach_arch_get_tls_value_from_thread (pthread_t thread, guint32 key)
 177 {
 178         return *(void**)mono_mach_get_tls_address_from_thread (thread, key);
 179 }
 180
 181 void
 182 mono_mach_init (pthread_key_t key)
 183 {
 184         int i;
 185         void *old_value = pthread_getspecific (key);
 186         void *canary = (void*)0xDEADBEEFu;
 187
 188         pthread_key_create (&key, NULL);
 189         g_assert (old_value != canary);
 190
 191         pthread_setspecific (key, canary);
 192
 193         /*First we probe for cats*/
 194         tls_vector_offset = TLS_VECTOR_OFFSET_CATS;
 195         if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
 196                 goto ok;
 197
 198         tls_vector_offset = TLS_VECTOR_OFFSET_10_9;
 199         if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
 200                 goto ok;
 201
 202         tls_vector_offset = TLS_VECTOR_OFFSET_10_11;
 203         if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
 204                 goto ok;
 205
 206         /*Fallback to scanning a large range of offsets*/
 207         for (i = TLS_PROBE_LOW_WATERMARK; i <= TLS_PROBE_HIGH_WATERMARK; i += 4) {
 208                 tls_vector_offset = i;
 209                 if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary) {
 210                         g_warning ("Found new TLS offset at %d", i);
 211                         goto ok;
 212                 }
 213         }
 214
 215         tls_vector_offset = -1;
 216         g_warning ("could not discover the mach TLS offset");
 217 ok:
 218         pthread_setspecific (key, old_value);
 219 }
 220
 221 #endif