1 /* 2 * Copyright 2015-2020 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 #ifndef OSSL_CRYPTO_ASYNC_POSIX_H 11 #define OSSL_CRYPTO_ASYNC_POSIX_H 12 #include <openssl/e_os2.h> 13 14 #if defined(OPENSSL_SYS_UNIX) \ 15 && defined(OPENSSL_THREADS) && !defined(OPENSSL_NO_ASYNC) \ 16 && !defined(__ANDROID__) && !defined(__OpenBSD__) 17 18 # include <unistd.h> 19 20 # if _POSIX_VERSION >= 200112L \ 21 && (_POSIX_VERSION < 200809L || defined(__GLIBC__)) 22 23 # include <pthread.h> 24 25 # define ASYNC_POSIX 26 # define ASYNC_ARCH 27 28 # ifdef __CET__ 29 /* 30 * When Intel CET is enabled, makecontext will create a different 31 * shadow stack for each context. async_fibre_swapcontext cannot 32 * use _longjmp. It must call swapcontext to swap shadow stack as 33 * well as normal stack. 34 */ 35 # define USE_SWAPCONTEXT 36 # endif 37 # include <ucontext.h> 38 # ifndef USE_SWAPCONTEXT 39 # include <setjmp.h> 40 # endif 41 42 typedef struct async_fibre_st { 43 ucontext_t fibre; 44 # ifndef USE_SWAPCONTEXT 45 jmp_buf env; 46 int env_init; 47 # endif 48 } async_fibre; 49 async_fibre_swapcontext(async_fibre * o,async_fibre * n,int r)50static ossl_inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r) 51 { 52 # ifdef USE_SWAPCONTEXT 53 swapcontext(&o->fibre, &n->fibre); 54 # else 55 o->env_init = 1; 56 57 if (!r || !_setjmp(o->env)) { 58 if (n->env_init) 59 _longjmp(n->env, 1); 60 else 61 setcontext(&n->fibre); 62 } 63 # endif 64 65 return 1; 66 } 67 68 # define async_fibre_init_dispatcher(d) 69 70 int async_fibre_makecontext(async_fibre *fibre); 71 void async_fibre_free(async_fibre *fibre); 72 73 # endif 74 #endif 75 #endif /* OSSL_CRYPTO_ASYNC_POSIX_H */ 76