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/*
* Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_CRYPTO_ASYNC_POSIX_H
#define OSSL_CRYPTO_ASYNC_POSIX_H
#include <openssl/e_os2.h>
#if defined(OPENSSL_SYS_UNIX) \
&& defined(OPENSSL_THREADS) && !defined(OPENSSL_NO_ASYNC) \
&& !defined(__ANDROID__) && !defined(__OpenBSD__)
# include <unistd.h>
# if _POSIX_VERSION >= 200112L \
&& (_POSIX_VERSION < 200809L || defined(__GLIBC__))
# include <pthread.h>
# define ASYNC_POSIX
# define ASYNC_ARCH
# if defined(__CET__) || defined(__ia64__)
/*
* When Intel CET is enabled, makecontext will create a different
* shadow stack for each context. async_fibre_swapcontext cannot
* use _longjmp. It must call swapcontext to swap shadow stack as
* well as normal stack.
* On IA64 the register stack engine is not saved across setjmp/longjmp. Here
* swapcontext() performs correctly.
*/
# define USE_SWAPCONTEXT
# endif
# if defined(__aarch64__) && defined(__clang__) \
&& defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
/*
* setjmp/longjmp don't currently work with BTI on all libc implementations
* when compiled by clang. This is because clang doesn't put a BTI after the
* call to setjmp where it returns the second time. This then fails on libc
* implementations - notably glibc - which use an indirect jump to there.
* So use the swapcontext implementation, which does work.
* See https://github.com/llvm/llvm-project/issues/48888.
*/
# define USE_SWAPCONTEXT
# endif
# include <ucontext.h>
# ifndef USE_SWAPCONTEXT
# include <setjmp.h>
# endif
typedef struct async_fibre_st {
ucontext_t fibre;
# ifndef USE_SWAPCONTEXT
jmp_buf env;
int env_init;
# endif
} async_fibre;
int async_local_init(void);
void async_local_deinit(void);
static ossl_inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r)
{
# ifdef USE_SWAPCONTEXT
swapcontext(&o->fibre, &n->fibre);
# else
o->env_init = 1;
if (!r || !_setjmp(o->env)) {
if (n->env_init)
_longjmp(n->env, 1);
else
setcontext(&n->fibre);
}
# endif
return 1;
}
# define async_fibre_init_dispatcher(d)
int async_fibre_makecontext(async_fibre *fibre);
void async_fibre_free(async_fibre *fibre);
# endif
#endif
#endif /* OSSL_CRYPTO_ASYNC_POSIX_H */
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