/**
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* \file
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* mach support for x86
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*
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* Authors:
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* Geoff Norton (gnorton@novell.com)
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*
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* (C) 2010 Novell, Inc.
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*/
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#include <config.h>
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#if defined(__MACH__)
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#include <stdint.h>
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#include <glib.h>
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#include <pthread.h>
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#include "utils/mono-sigcontext.h"
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#include "mach-support.h"
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// For reg numbers
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#include <mono/arch/amd64/amd64-codegen.h>
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/* Known offsets used for TLS storage*/
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/* All OSX versions up to 10.8 */
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#define TLS_VECTOR_OFFSET_CATS 0x48
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#define TLS_VECTOR_OFFSET_10_9 0xb0
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#define TLS_VECTOR_OFFSET_10_11 0x100
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/* This is 2 slots less than the known low */
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#define TLS_PROBE_LOW_WATERMARK 0x40
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/* This is 28 slots above the know high, which is more than the known high-low*/
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#define TLS_PROBE_HIGH_WATERMARK 0x120
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static int tls_vector_offset;
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void *
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mono_mach_arch_get_ip (thread_state_t state)
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{
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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return (void *) arch_state->__eip;
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}
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void *
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mono_mach_arch_get_sp (thread_state_t state)
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{
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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return (void *) arch_state->__esp;
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}
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int
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mono_mach_arch_get_mcontext_size ()
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{
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return sizeof (struct __darwin_mcontext32);
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}
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void
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mono_mach_arch_thread_states_to_mcontext (thread_state_t state, thread_state_t fpstate, void *context)
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{
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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x86_float_state32_t *arch_fpstate = (x86_float_state32_t *) fpstate;
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struct __darwin_mcontext32 *ctx = (struct __darwin_mcontext32 *) context;
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ctx->__ss = *arch_state;
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ctx->__fs = *arch_fpstate;
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}
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void
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mono_mach_arch_mcontext_to_thread_states (void *context, thread_state_t state, thread_state_t fpstate)
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{
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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x86_float_state32_t *arch_fpstate = (x86_float_state32_t *) fpstate;
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struct __darwin_mcontext32 *ctx = (struct __darwin_mcontext32 *) context;
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*arch_state = ctx->__ss;
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*arch_fpstate = ctx->__fs;
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}
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void
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mono_mach_arch_thread_states_to_mono_context (thread_state_t state, thread_state_t fpstate, MonoContext *context)
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{
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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x86_float_state32_t *arch_fpstate = (x86_float_state32_t *) state;
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context->eax = arch_state->__eax;
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context->ebx = arch_state->__ebx;
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context->ecx = arch_state->__ecx;
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context->edx = arch_state->__edx;
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context->ebp = arch_state->__ebp;
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context->esp = arch_state->__esp;
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context->esi = arch_state->__edi;
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context->edi = arch_state->__esi;
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context->eip = arch_state->__eip;
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context->fregs [X86_XMM0] = arch_fpstate->__fpu_xmm0;
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context->fregs [X86_XMM1] = arch_fpstate->__fpu_xmm1;
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context->fregs [X86_XMM2] = arch_fpstate->__fpu_xmm2;
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context->fregs [X86_XMM3] = arch_fpstate->__fpu_xmm3;
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context->fregs [X86_XMM4] = arch_fpstate->__fpu_xmm4;
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context->fregs [X86_XMM5] = arch_fpstate->__fpu_xmm5;
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context->fregs [X86_XMM6] = arch_fpstate->__fpu_xmm6;
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context->fregs [X86_XMM7] = arch_fpstate->__fpu_xmm7;
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}
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int
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mono_mach_arch_get_thread_state_size ()
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{
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return sizeof (x86_thread_state32_t);
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}
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int
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mono_mach_arch_get_thread_fpstate_size ()
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{
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return sizeof (x86_float_state32_t);
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}
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kern_return_t
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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)
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{
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#if defined(HOST_WATCHOS)
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g_error ("thread_get_state() is not supported by this platform");
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#else
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x86_thread_state32_t *arch_state = (x86_thread_state32_t *) state;
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x86_float_state32_t *arch_fpstate = (x86_float_state32_t *) fpstate;
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kern_return_t ret;
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*count = x86_THREAD_STATE32_COUNT;
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*fpcount = x86_FLOAT_STATE32_COUNT;
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ret = thread_get_state (thread, x86_THREAD_STATE32, (thread_state_t)arch_state, count);
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if (ret != KERN_SUCCESS)
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return ret;
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ret = thread_get_state (thread, x86_FLOAT_STATE32, (thread_state_t)arch_fpstate, fpcount);
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return ret;
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#endif
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}
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kern_return_t
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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)
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{
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#if defined(HOST_WATCHOS)
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g_error ("thread_set_state() is not supported by this platform");
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#else
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kern_return_t ret;
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ret = thread_set_state (thread, x86_THREAD_STATE32, state, count);
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if (ret != KERN_SUCCESS)
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return ret;
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ret = thread_set_state (thread, x86_FLOAT_STATE32, fpstate, fpcount);
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return ret;
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#endif
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}
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void *
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mono_mach_get_tls_address_from_thread (pthread_t thread, pthread_key_t key)
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{
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/* OSX stores TLS values in a hidden array inside the pthread_t structure
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* They are keyed off a giant array from a known offset into the pointer. This value
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* is baked into their pthread_getspecific implementation
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*/
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intptr_t *p = (intptr_t *) thread;
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intptr_t **tsd = (intptr_t **) ((char*)p + tls_vector_offset);
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g_assert (tls_vector_offset != -1);
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return (void *) &tsd [key];
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}
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void *
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mono_mach_arch_get_tls_value_from_thread (pthread_t thread, guint32 key)
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{
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return *(void**)mono_mach_get_tls_address_from_thread (thread, key);
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}
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void
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mono_mach_init (pthread_key_t key)
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{
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int i;
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void *old_value = pthread_getspecific (key);
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void *canary = (void*)0xDEADBEEFu;
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pthread_key_create (&key, NULL);
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g_assert (old_value != canary);
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pthread_setspecific (key, canary);
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/*First we probe for cats*/
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tls_vector_offset = TLS_VECTOR_OFFSET_CATS;
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if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
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goto ok;
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tls_vector_offset = TLS_VECTOR_OFFSET_10_9;
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if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
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goto ok;
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tls_vector_offset = TLS_VECTOR_OFFSET_10_11;
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if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary)
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goto ok;
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/*Fallback to scanning a large range of offsets*/
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for (i = TLS_PROBE_LOW_WATERMARK; i <= TLS_PROBE_HIGH_WATERMARK; i += 4) {
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tls_vector_offset = i;
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if (mono_mach_arch_get_tls_value_from_thread (pthread_self (), key) == canary) {
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g_warning ("Found new TLS offset at %d", i);
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goto ok;
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}
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}
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tls_vector_offset = -1;
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g_warning ("could not discover the mach TLS offset");
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ok:
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pthread_setspecific (key, old_value);
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}
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#endif
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