| 1 | /*
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| 2 | * Copyright 2015-2022 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the Apache License 2.0 (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #ifndef OSSL_CRYPTO_ASYNC_POSIX_H
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| 11 | #define OSSL_CRYPTO_ASYNC_POSIX_H
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| 12 | #include <openssl/e_os2.h>
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| 13 |
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| 14 | #if defined(OPENSSL_SYS_UNIX) \
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| 15 | && defined(OPENSSL_THREADS) && !defined(OPENSSL_NO_ASYNC) \
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| 16 | && !defined(__ANDROID__) && !defined(__OpenBSD__) /* VBOX: */ && !defined(RT_OS_OS2)
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| 17 |
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| 18 | # include <unistd.h>
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| 19 |
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| 20 | # if _POSIX_VERSION >= 200112L \
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| 21 | && (_POSIX_VERSION < 200809L || defined(__GLIBC__))
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| 22 |
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| 23 | # include <pthread.h>
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| 24 |
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| 25 | # define ASYNC_POSIX
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| 26 | # define ASYNC_ARCH
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| 27 |
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| 28 | # if defined(__CET__) || defined(__ia64__)
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| 29 | /*
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| 30 | * When Intel CET is enabled, makecontext will create a different
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| 31 | * shadow stack for each context. async_fibre_swapcontext cannot
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| 32 | * use _longjmp. It must call swapcontext to swap shadow stack as
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| 33 | * well as normal stack.
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| 34 | * On IA64 the register stack engine is not saved across setjmp/longjmp. Here
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| 35 | * swapcontext() performs correctly.
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| 36 | */
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| 37 | # define USE_SWAPCONTEXT
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| 38 | # endif
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| 39 | # if defined(__aarch64__) && defined(__clang__) \
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| 40 | && defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
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| 41 | /*
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| 42 | * setjmp/longjmp don't currently work with BTI on all libc implementations
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| 43 | * when compiled by clang. This is because clang doesn't put a BTI after the
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| 44 | * call to setjmp where it returns the second time. This then fails on libc
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| 45 | * implementations - notably glibc - which use an indirect jump to there.
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| 46 | * So use the swapcontext implementation, which does work.
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| 47 | * See https://github.com/llvm/llvm-project/issues/48888.
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| 48 | */
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| 49 | # define USE_SWAPCONTEXT
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| 50 | # endif
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| 51 | # include <ucontext.h>
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| 52 | # ifndef USE_SWAPCONTEXT
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| 53 | # include <setjmp.h>
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| 54 | # endif
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| 55 |
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| 56 | typedef struct async_fibre_st {
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| 57 | ucontext_t fibre;
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| 58 | # ifndef USE_SWAPCONTEXT
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| 59 | jmp_buf env;
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| 60 | int env_init;
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| 61 | # endif
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| 62 | } async_fibre;
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| 63 |
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| 64 | static ossl_inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r)
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| 65 | {
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| 66 | # ifdef USE_SWAPCONTEXT
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| 67 | swapcontext(&o->fibre, &n->fibre);
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| 68 | # else
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| 69 | o->env_init = 1;
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| 70 |
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| 71 | if (!r || !_setjmp(o->env)) {
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| 72 | if (n->env_init)
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| 73 | _longjmp(n->env, 1);
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| 74 | else
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| 75 | setcontext(&n->fibre);
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| 76 | }
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| 77 | # endif
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| 78 |
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| 79 | return 1;
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| 80 | }
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| 81 |
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| 82 | # define async_fibre_init_dispatcher(d)
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| 83 |
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| 84 | int async_fibre_makecontext(async_fibre *fibre);
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| 85 | void async_fibre_free(async_fibre *fibre);
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| 86 |
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| 87 | # endif
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| 88 | #endif
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| 89 | #endif /* OSSL_CRYPTO_ASYNC_POSIX_H */
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