/** * \file * 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" //For reg numbers #include /* 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 #define TLS_VECTOR_OFFSET_10_11 0x100 /* This is 2 slots less than the known low */ #define TLS_PROBE_LOW_WATERMARK 0x50 /* This is 28 slots above the know high, which is more than the known high-low*/ #define TLS_PROBE_HIGH_WATERMARK 0x200 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_states_to_mcontext (thread_state_t state, thread_state_t fpstate, void *context) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate; struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context; ctx->__ss = *arch_state; ctx->__fs = *arch_fpstate; } void mono_mach_arch_mcontext_to_thread_states (void *context, thread_state_t state, thread_state_t fpstate) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate; struct __darwin_mcontext64 *ctx = (struct __darwin_mcontext64 *) context; *arch_state = ctx->__ss; *arch_fpstate = ctx->__fs; } void mono_mach_arch_thread_states_to_mono_context (thread_state_t state, thread_state_t fpstate, MonoContext *context) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *) state; x86_float_state64_t *arch_fpstate = (x86_float_state64_t *) fpstate; context->gregs [AMD64_RAX] = arch_state->__rax; context->gregs [AMD64_RBX] = arch_state->__rbx; context->gregs [AMD64_RCX] = arch_state->__rcx; context->gregs [AMD64_RDX] = arch_state->__rdx; context->gregs [AMD64_RDI] = arch_state->__rdi; context->gregs [AMD64_RSI] = arch_state->__rsi; context->gregs [AMD64_RBP] = arch_state->__rbp; context->gregs [AMD64_RSP] = arch_state->__rsp; context->gregs [AMD64_R8] = arch_state->__r8; context->gregs [AMD64_R9] = arch_state->__r9; context->gregs [AMD64_R10] = arch_state->__r10; context->gregs [AMD64_R11] = arch_state->__r11; context->gregs [AMD64_R12] = arch_state->__r12; context->gregs [AMD64_R13] = arch_state->__r13; context->gregs [AMD64_R14] = arch_state->__r14; context->gregs [AMD64_R15] = arch_state->__r15; context->gregs [AMD64_RIP] = arch_state->__rip; context->fregs [AMD64_XMM0] = arch_fpstate->__fpu_xmm0; context->fregs [AMD64_XMM1] = arch_fpstate->__fpu_xmm1; context->fregs [AMD64_XMM2] = arch_fpstate->__fpu_xmm2; context->fregs [AMD64_XMM3] = arch_fpstate->__fpu_xmm3; context->fregs [AMD64_XMM4] = arch_fpstate->__fpu_xmm4; context->fregs [AMD64_XMM5] = arch_fpstate->__fpu_xmm5; context->fregs [AMD64_XMM6] = arch_fpstate->__fpu_xmm6; context->fregs [AMD64_XMM7] = arch_fpstate->__fpu_xmm7; context->fregs [AMD64_XMM8] = arch_fpstate->__fpu_xmm8; context->fregs [AMD64_XMM9] = arch_fpstate->__fpu_xmm9; context->fregs [AMD64_XMM10] = arch_fpstate->__fpu_xmm10; context->fregs [AMD64_XMM11] = arch_fpstate->__fpu_xmm11; context->fregs [AMD64_XMM12] = arch_fpstate->__fpu_xmm12; context->fregs [AMD64_XMM13] = arch_fpstate->__fpu_xmm13; context->fregs [AMD64_XMM14] = arch_fpstate->__fpu_xmm14; context->fregs [AMD64_XMM15] = arch_fpstate->__fpu_xmm15; } int mono_mach_arch_get_thread_state_size () { return sizeof (x86_thread_state64_t); } int mono_mach_arch_get_thread_fpstate_size () { return sizeof (x86_float_state64_t); } kern_return_t 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) { x86_thread_state64_t *arch_state = (x86_thread_state64_t *)state; x86_float_state64_t *arch_fpstate = (x86_float_state64_t *)fpstate; kern_return_t ret; *count = x86_THREAD_STATE64_COUNT; *fpcount = x86_FLOAT_STATE64_COUNT; ret = thread_get_state (thread, x86_THREAD_STATE64, (thread_state_t)arch_state, count); if (ret != KERN_SUCCESS) return ret; ret = thread_get_state (thread, x86_FLOAT_STATE64, (thread_state_t)arch_fpstate, fpcount); return ret; } kern_return_t 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) { kern_return_t ret; ret = thread_set_state (thread, x86_THREAD_STATE64, state, count); if (ret != KERN_SUCCESS) return ret; ret = thread_set_state (thread, x86_FLOAT_STATE64, fpstate, fpcount); return ret; } 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); g_assert (tls_vector_offset != -1); 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) { 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*/ 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; /*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; } } tls_vector_offset = -1; g_warning ("could not discover the mach TLS offset"); ok: pthread_setspecific (key, old_value); } #endif