mirror of
https://github.com/openssl/openssl.git
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93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
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* Copyright 2015-2024 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_CRYPTO_ASYNC_POSIX_H
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#define OSSL_CRYPTO_ASYNC_POSIX_H
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#include <openssl/e_os2.h>
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#if defined(OPENSSL_SYS_UNIX) \
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&& defined(OPENSSL_THREADS) && !defined(OPENSSL_NO_ASYNC) \
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&& !defined(__ANDROID__) && !defined(__OpenBSD__)
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# include <unistd.h>
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# if _POSIX_VERSION >= 200112L \
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&& (_POSIX_VERSION < 200809L || defined(__GLIBC__) || defined(__FreeBSD__))
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# include <pthread.h>
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# define ASYNC_POSIX
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# define ASYNC_ARCH
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# if defined(__CET__) || defined(__ia64__)
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/*
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* When Intel CET is enabled, makecontext will create a different
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* shadow stack for each context. async_fibre_swapcontext cannot
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* use _longjmp. It must call swapcontext to swap shadow stack as
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* well as normal stack.
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* On IA64 the register stack engine is not saved across setjmp/longjmp. Here
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* swapcontext() performs correctly.
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*/
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# define USE_SWAPCONTEXT
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# endif
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# if defined(__aarch64__) && defined(__clang__) \
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&& defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
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/*
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* setjmp/longjmp don't currently work with BTI on all libc implementations
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* when compiled by clang. This is because clang doesn't put a BTI after the
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* call to setjmp where it returns the second time. This then fails on libc
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* implementations - notably glibc - which use an indirect jump to there.
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* So use the swapcontext implementation, which does work.
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* See https://github.com/llvm/llvm-project/issues/48888.
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*/
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# define USE_SWAPCONTEXT
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# endif
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# include <ucontext.h>
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# ifndef USE_SWAPCONTEXT
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# include <setjmp.h>
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# endif
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typedef struct async_fibre_st {
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ucontext_t fibre;
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# ifndef USE_SWAPCONTEXT
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jmp_buf env;
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int env_init;
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# endif
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} async_fibre;
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int async_local_init(void);
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void async_local_deinit(void);
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static ossl_inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r)
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{
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# ifdef USE_SWAPCONTEXT
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swapcontext(&o->fibre, &n->fibre);
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# else
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o->env_init = 1;
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if (!r || !_setjmp(o->env)) {
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if (n->env_init)
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_longjmp(n->env, 1);
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else
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setcontext(&n->fibre);
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}
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# endif
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return 1;
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}
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# define async_fibre_init_dispatcher(d)
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int async_fibre_makecontext(async_fibre *fibre);
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void async_fibre_free(async_fibre *fibre);
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# endif
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#endif
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#endif /* OSSL_CRYPTO_ASYNC_POSIX_H */
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