/src/openssl/crypto/async/arch/async_posix.h
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1 | | /* |
2 | | * Copyright 2015-2024 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 | | && !defined(OPENSSL_SYS_TANDEM) |
18 | | |
19 | | #include <unistd.h> |
20 | | |
21 | | #if _POSIX_VERSION >= 200112L \ |
22 | | && (_POSIX_VERSION < 200809L || defined(__GLIBC__) || defined(__FreeBSD__)) |
23 | | |
24 | | #include <pthread.h> |
25 | | |
26 | | #define ASYNC_POSIX |
27 | | #define ASYNC_ARCH |
28 | | |
29 | | #if defined(__CET__) || defined(__ia64__) |
30 | | /* |
31 | | * When Intel CET is enabled, makecontext will create a different |
32 | | * shadow stack for each context. async_fibre_swapcontext cannot |
33 | | * use _longjmp. It must call swapcontext to swap shadow stack as |
34 | | * well as normal stack. |
35 | | * On IA64 the register stack engine is not saved across setjmp/longjmp. Here |
36 | | * swapcontext() performs correctly. |
37 | | */ |
38 | | #define USE_SWAPCONTEXT |
39 | | #endif |
40 | | #if defined(__aarch64__) && defined(__clang__) \ |
41 | | && defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1 |
42 | | /* |
43 | | * setjmp/longjmp don't currently work with BTI on all libc implementations |
44 | | * when compiled by clang. This is because clang doesn't put a BTI after the |
45 | | * call to setjmp where it returns the second time. This then fails on libc |
46 | | * implementations - notably glibc - which use an indirect jump to there. |
47 | | * So use the swapcontext implementation, which does work. |
48 | | * See https://github.com/llvm/llvm-project/issues/48888. |
49 | | */ |
50 | | #define USE_SWAPCONTEXT |
51 | | #endif |
52 | | #if defined(OPENSSL_SYS_TANDEM) |
53 | | #include <tdmsig.h> |
54 | | #else |
55 | | #include <ucontext.h> |
56 | | #endif |
57 | | #ifndef USE_SWAPCONTEXT |
58 | | #include <setjmp.h> |
59 | | #endif |
60 | | |
61 | | typedef struct async_fibre_st { |
62 | | ucontext_t fibre; |
63 | | #ifndef USE_SWAPCONTEXT |
64 | | jmp_buf env; |
65 | | int env_init; |
66 | | #endif |
67 | | } async_fibre; |
68 | | |
69 | | int async_local_init(void); |
70 | | void async_local_deinit(void); |
71 | | |
72 | | static ossl_inline int async_fibre_swapcontext(async_fibre *o, async_fibre *n, int r) |
73 | 0 | { |
74 | | #ifdef USE_SWAPCONTEXT |
75 | | swapcontext(&o->fibre, &n->fibre); |
76 | | #else |
77 | 0 | o->env_init = 1; |
78 | |
|
79 | 0 | if (!r || !_setjmp(o->env)) { |
80 | 0 | if (n->env_init) |
81 | 0 | _longjmp(n->env, 1); |
82 | 0 | else |
83 | 0 | setcontext(&n->fibre); |
84 | 0 | } |
85 | 0 | #endif |
86 | | |
87 | 0 | return 1; |
88 | 0 | } Unexecuted instantiation: async.c:async_fibre_swapcontext Unexecuted instantiation: async_wait.c:async_fibre_swapcontext Unexecuted instantiation: async_posix.c:async_fibre_swapcontext |
89 | | |
90 | | #define async_fibre_init_dispatcher(d) |
91 | | |
92 | | int async_fibre_makecontext(async_fibre *fibre); |
93 | | void async_fibre_free(async_fibre *fibre); |
94 | | |
95 | | #endif |
96 | | #endif |
97 | | #endif /* OSSL_CRYPTO_ASYNC_POSIX_H */ |