1/* 2 * Copyright 2014, Pawe�� Dziepak, pdziepak@quarnos.org. 3 * Copyright 2012, Alex Smith, alex@alex-smith.me.uk. 4 * Distributed under the terms of the MIT License. 5 */ 6 7 8#include <atomic> 9 10#include <runtime_loader/runtime_loader.h> 11 12#include <support/TLS.h> 13#include <tls.h> 14 15#include <assert.h> 16 17 18struct tls_index { 19 unsigned long int module; 20 unsigned long int offset; 21}; 22 23 24static std::atomic<int> gNextSlot(TLS_FIRST_FREE_SLOT); 25 26 27static inline void** 28get_tls() 29{ 30 void** tls; 31 __asm__ __volatile__ ("movq %%fs:0, %0" : "=r" (tls)); 32 return tls; 33} 34 35 36int32 37tls_allocate() 38{ 39 if (gNextSlot < TLS_MAX_KEYS) { 40 auto next = gNextSlot++; 41 if (next < TLS_MAX_KEYS) 42 return next; 43 } 44 45 return B_NO_MEMORY; 46} 47 48 49void* 50tls_get(int32 index) 51{ 52 return get_tls()[index]; 53} 54 55 56void** 57tls_address(int32 index) 58{ 59 return get_tls() + index; 60} 61 62 63void 64tls_set(int32 index, void* value) 65{ 66 get_tls()[index] = value; 67} 68 69 70extern "C" void* 71__tls_get_addr(tls_index* ti) 72{ 73 return __gRuntimeLoader->get_tls_address(ti->module, ti->offset); 74} 75 76