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|---|---|---|---|
| 1 | /* GATE PROJECT LICENSE: | ||
| 2 | +----------------------------------------------------------------------------+ | ||
| 3 | | Copyright(c) 2018-2025, Stefan Meislinger <sm@opengate.at> | | ||
| 4 | | All rights reserved. | | ||
| 5 | | | | ||
| 6 | | Redistribution and use in source and binary forms, with or without | | ||
| 7 | | modification, are permitted provided that the following conditions are met:| | ||
| 8 | | | | ||
| 9 | | 1. Redistributions of source code must retain the above copyright notice, | | ||
| 10 | | this list of conditions and the following disclaimer. | | ||
| 11 | | 2. Redistributions in binary form must reproduce the above copyright | | ||
| 12 | | notice, this list of conditions and the following disclaimer in the | | ||
| 13 | | documentation and/or other materials provided with the distribution. | | ||
| 14 | | | | ||
| 15 | | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"| | ||
| 16 | | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | | ||
| 17 | | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | | ||
| 18 | | ARE DISCLAIMED.IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | | ||
| 19 | | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | | ||
| 20 | | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | | ||
| 21 | | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | | ||
| 22 | | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | | ||
| 23 | | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | | ||
| 24 | | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF | | ||
| 25 | | THE POSSIBILITY OF SUCH DAMAGE. | | ||
| 26 | +----------------------------------------------------------------------------+ | ||
| 27 | */ | ||
| 28 | #include "gate/platform/posix/posixucontext.h" | ||
| 29 | #include "gate/results.h" | ||
| 30 | |||
| 31 | #if defined(GATE_SYS_OPENBSD) | ||
| 32 | # define GATE_POSIX_UCONTEXT_SJLJ_IMPL 1 | ||
| 33 | #elif defined(GATE_SYS_POSIX) | ||
| 34 | # define GATE_POSIX_UCONTEXT_NATIVE_IMPL 1 | ||
| 35 | #endif | ||
| 36 | |||
| 37 | |||
| 38 | #if defined(GATE_POSIX_UCONTEXT_SJLJ_IMPL) | ||
| 39 | |||
| 40 | #include "gate/atomics.h" | ||
| 41 | #include <signal.h> | ||
| 42 | #include <setjmp.h> | ||
| 43 | #include <pthread.h> | ||
| 44 | |||
| 45 | typedef struct sjlj_uctx_class | ||
| 46 | { | ||
| 47 | jmp_buf anchor; | ||
| 48 | jmp_buf init_anchor; | ||
| 49 | |||
| 50 | void* stack; | ||
| 51 | gate_size_t stack_size; | ||
| 52 | |||
| 53 | void(*target_func)(int, int, int, int); | ||
| 54 | int params[4]; | ||
| 55 | } sjlj_uctx_t; | ||
| 56 | |||
| 57 | gate_result_t gate_posix_uctx_init() | ||
| 58 | { | ||
| 59 | return GATE_RESULT_OK; | ||
| 60 | } | ||
| 61 | |||
| 62 | void gate_posix_uctx_setup(void* uctx, void* ptr_stack, gate_size_t stack_size) | ||
| 63 | { | ||
| 64 | sjlj_uctx_t* ptr_ctx = (sjlj_uctx_t*)uctx; | ||
| 65 | |||
| 66 | ptr_ctx->stack = ptr_stack; | ||
| 67 | ptr_ctx->stack_size = stack_size; | ||
| 68 | } | ||
| 69 | |||
| 70 | static sjlj_uctx_t* current_setup_ctx = NULL; | ||
| 71 | static gate_atomic_int_t current_setup_completed; | ||
| 72 | |||
| 73 | static void gate_posix_uctx_dispatcher_handler(int sig_num) | ||
| 74 | { | ||
| 75 | sjlj_uctx_t* ptr_ctx = current_setup_ctx; | ||
| 76 | void(*callback)(int, int, int, int); | ||
| 77 | int p[4]; | ||
| 78 | |||
| 79 | callback = ptr_ctx->target_func; | ||
| 80 | p[0] = ptr_ctx->params[0]; | ||
| 81 | p[1] = ptr_ctx->params[1]; | ||
| 82 | p[2] = ptr_ctx->params[2]; | ||
| 83 | p[3] = ptr_ctx->params[3]; | ||
| 84 | |||
| 85 | gate_atomic_int_set(¤t_setup_completed, 1); | ||
| 86 | |||
| 87 | if (0 == setjmp(ptr_ctx->anchor)) | ||
| 88 | { | ||
| 89 | /* first callstack-setup */ | ||
| 90 | longjmp(ptr_ctx->init_anchor, 1); | ||
| 91 | } | ||
| 92 | else | ||
| 93 | { | ||
| 94 | /* longjmp from swap */ | ||
| 95 | callback(p[0], p[1], p[2], p[3]); | ||
| 96 | } | ||
| 97 | } | ||
| 98 | |||
| 99 | gate_result_t gate_posix_uctx_make(void* uctx, void(*func)(int, int, int, int), int a1, int a2, int a3, int a4) | ||
| 100 | { | ||
| 101 | sjlj_uctx_t* ptr_ctx = (sjlj_uctx_t*)uctx; | ||
| 102 | sigset_t sigs; | ||
| 103 | sigset_t original_sigs; | ||
| 104 | struct sigaction sig_action = GATE_INIT_EMPTY; | ||
| 105 | struct sigaction old_sig_action = GATE_INIT_EMPTY; | ||
| 106 | struct sigaltstack sig_stack = GATE_INIT_EMPTY; | ||
| 107 | struct sigaltstack old_sig_stack = GATE_INIT_EMPTY; | ||
| 108 | |||
| 109 | ptr_ctx->target_func = func; | ||
| 110 | ptr_ctx->params[0] = a1; | ||
| 111 | ptr_ctx->params[1] = a2; | ||
| 112 | ptr_ctx->params[2] = a3; | ||
| 113 | ptr_ctx->params[3] = a4; | ||
| 114 | |||
| 115 | static gate_atomic_lock_t ctx_make_lock = GATE_ATOMIC_LOCK_INIT; | ||
| 116 | |||
| 117 | gate_atomic_lock_acquire(&ctx_make_lock); | ||
| 118 | |||
| 119 | |||
| 120 | if (0 == setjmp(ptr_ctx->init_anchor)) | ||
| 121 | { | ||
| 122 | /* anchor set, now */ | ||
| 123 | |||
| 124 | sigemptyset(&sigs); | ||
| 125 | sigaddset(&sigs, SIGUSR1); | ||
| 126 | pthread_sigmask(SIG_BLOCK, &sigs, &original_sigs); | ||
| 127 | |||
| 128 | sig_action.sa_handler = &gate_posix_uctx_dispatcher_handler; | ||
| 129 | sig_action.sa_flags = SA_ONSTACK; | ||
| 130 | sigemptyset(&sig_action.sa_mask); | ||
| 131 | sigaction(SIGUSR1, &sig_action, &old_sig_action); | ||
| 132 | |||
| 133 | sig_stack.ss_sp = ptr_ctx->stack; | ||
| 134 | sig_stack.ss_size = ptr_ctx->stack_size; | ||
| 135 | sig_stack.ss_flags = 0; | ||
| 136 | sigaltstack(&sig_stack, &old_sig_stack); | ||
| 137 | |||
| 138 | current_setup_ctx = ptr_ctx; | ||
| 139 | gate_atomic_int_set(¤t_setup_completed, 0); | ||
| 140 | |||
| 141 | pthread_kill(pthread_self(), SIGUSR1); | ||
| 142 | sigfillset(&sigs); | ||
| 143 | sigdelset(&sigs, SIGUSR1); | ||
| 144 | while (gate_atomic_int_get(¤t_setup_completed) == 0) | ||
| 145 | { | ||
| 146 | sigsuspend(&sigs); | ||
| 147 | } | ||
| 148 | } | ||
| 149 | else | ||
| 150 | { | ||
| 151 | } | ||
| 152 | |||
| 153 | gate_atomic_lock_release(&ctx_make_lock); | ||
| 154 | |||
| 155 | sigaltstack(NULL, &sig_stack); | ||
| 156 | sig_stack.ss_flags = SS_DISABLE; | ||
| 157 | sigaltstack(&sig_stack, NULL); | ||
| 158 | |||
| 159 | if (!(old_sig_stack.ss_flags & SS_DISABLE)) | ||
| 160 | { | ||
| 161 | sigaltstack(&old_sig_stack, NULL); | ||
| 162 | } | ||
| 163 | sigaction(SIGUSR1, &old_sig_action, NULL); | ||
| 164 | pthread_sigmask(SIG_SETMASK, &sigs, NULL); | ||
| 165 | |||
| 166 | return GATE_RESULT_OK; | ||
| 167 | } | ||
| 168 | |||
| 169 | int gate_posix_uctx_swap(void* save_ctx, void* load_ctx) | ||
| 170 | { | ||
| 171 | sjlj_uctx_t* ptr_save = (sjlj_uctx_t*)save_ctx; | ||
| 172 | sjlj_uctx_t* ptr_load = (sjlj_uctx_t*)load_ctx; | ||
| 173 | if (!ptr_save || !ptr_load) | ||
| 174 | { | ||
| 175 | return -1; | ||
| 176 | } | ||
| 177 | |||
| 178 | if (0 == setjmp(ptr_save->anchor)) | ||
| 179 | { | ||
| 180 | longjmp(ptr_load->anchor, 1); | ||
| 181 | } | ||
| 182 | return 0; | ||
| 183 | } | ||
| 184 | |||
| 185 | int gate_posix_uctx_get(void* uctx) | ||
| 186 | { | ||
| 187 | sjlj_uctx_t* ptr_ctx = (sjlj_uctx_t*)uctx; | ||
| 188 | return setjmp(ptr_ctx->anchor); | ||
| 189 | } | ||
| 190 | |||
| 191 | int gate_posix_uctx_set(void const* uctx) | ||
| 192 | { | ||
| 193 | sjlj_uctx_t* ptr_ctx = (sjlj_uctx_t*)uctx; | ||
| 194 | longjmp(ptr_ctx->anchor, 1); | ||
| 195 | return -1; | ||
| 196 | } | ||
| 197 | |||
| 198 | #endif /* GATE_POSIX_UCONTEXT_SJLJ_IMPL */ | ||
| 199 | |||
| 200 | |||
| 201 | |||
| 202 | #if defined(GATE_POSIX_UCONTEXT_NATIVE_IMPL) | ||
| 203 | |||
| 204 | #if defined(GATE_SYS_DARWIN) | ||
| 205 | # ifndef _XOPEN_SOURCE | ||
| 206 | # define _XOPEN_SOURCE | ||
| 207 | # endif | ||
| 208 | #endif | ||
| 209 | |||
| 210 | #include "gate/platforms.h" | ||
| 211 | |||
| 212 | #include <ucontext.h> | ||
| 213 | #include <dlfcn.h> | ||
| 214 | |||
| 215 | typedef void(*makecontext_func_t)(ucontext_t* ucp, void(*func)(), int argc, ...); | ||
| 216 | typedef int(*swapcontext_func_t)(ucontext_t* oucp, ucontext_t* ucp); | ||
| 217 | typedef int(*getcontext_func_t)(ucontext_t* ucp); | ||
| 218 | typedef int(*setcontext_func_t)(const ucontext_t* ucp); | ||
| 219 | |||
| 220 | static makecontext_func_t volatile makecontext_func = NULL; | ||
| 221 | static swapcontext_func_t volatile swapcontext_func = NULL; | ||
| 222 | static getcontext_func_t volatile getcontext_func = NULL; | ||
| 223 | static setcontext_func_t volatile setcontext_func = NULL; | ||
| 224 | |||
| 225 | |||
| 226 | #if defined(HAVE_MAKECONTEXT) | ||
| 227 | |||
| 228 | 74 | static int swapcontext_wrapper(ucontext_t* oucp, ucontext_t* ucp) | |
| 229 | { | ||
| 230 | 74 | return swapcontext(oucp, ucp); | |
| 231 | } | ||
| 232 | 11 | static int getcontext_wrapper(ucontext_t* ucp) | |
| 233 | { | ||
| 234 | 11 | return getcontext(ucp); | |
| 235 | } | ||
| 236 | 1 | static int setcontext_wrapper(const ucontext_t* ucp) | |
| 237 | { | ||
| 238 | 1 | return setcontext(ucp); | |
| 239 | } | ||
| 240 | |||
| 241 | |||
| 242 | 4 | gate_result_t gate_posix_uctx_init() | |
| 243 | { | ||
| 244 |
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4 | if (!makecontext_func || !swapcontext_func || !getcontext_func || !setcontext_func) |
| 245 | { | ||
| 246 | 2 | makecontext_func = &makecontext; | |
| 247 | 2 | swapcontext_func = &swapcontext_wrapper; | |
| 248 | 2 | getcontext_func = &getcontext_wrapper; | |
| 249 | 2 | setcontext_func = &setcontext_wrapper; | |
| 250 | } | ||
| 251 | 4 | return GATE_RESULT_OK; | |
| 252 | } | ||
| 253 | |||
| 254 | #else | ||
| 255 | |||
| 256 | static void* volatile libucontext_handle = NULL; | ||
| 257 | |||
| 258 | static void unload_uctx_atexit() | ||
| 259 | { | ||
| 260 | if (NULL != libucontext_handle) | ||
| 261 | { | ||
| 262 | void* handle = libucontext_handle; | ||
| 263 | libucontext_handle = NULL; | ||
| 264 | gate_posix_dlclose(handle); | ||
| 265 | } | ||
| 266 | } | ||
| 267 | |||
| 268 | static void load_uctx_from_libucontext() | ||
| 269 | { | ||
| 270 | if (NULL == libucontext_handle) | ||
| 271 | { | ||
| 272 | libucontext_handle = gate_posix_dlopen("libucontext.so.1", RTLD_GLOBAL); | ||
| 273 | if (NULL != libucontext_handle) | ||
| 274 | { | ||
| 275 | gate_platform_atexit(&unload_uctx_atexit); | ||
| 276 | } | ||
| 277 | else | ||
| 278 | { | ||
| 279 | return; | ||
| 280 | } | ||
| 281 | } | ||
| 282 | |||
| 283 | makecontext_func = (makecontext_func_t)gate_posix_dlsym(libucontext_handle, "makecontext"); | ||
| 284 | swapcontext_func = (swapcontext_func_t)gate_posix_dlsym(libucontext_handle, "swapcontext"); | ||
| 285 | getcontext_func = (getcontext_func_t)gate_posix_dlsym(libucontext_handle, "getcontext"); | ||
| 286 | setcontext_func = (setcontext_func_t)gate_posix_dlsym(libucontext_handle, "setcontext"); | ||
| 287 | } | ||
| 288 | |||
| 289 | |||
| 290 | gate_result_t gate_posix_uctx_init() | ||
| 291 | { | ||
| 292 | if (makecontext_func && swapcontext_func && getcontext_func && setcontext_func) | ||
| 293 | { | ||
| 294 | /* functions already loaded */ | ||
| 295 | return GATE_RESULT_OK; | ||
| 296 | } | ||
| 297 | |||
| 298 | /* try global symbols: */ | ||
| 299 | makecontext_func = (makecontext_func_t)gate_posix_global_sym("makecontext"); | ||
| 300 | swapcontext_func = (swapcontext_func_t)gate_posix_global_sym("swapcontext"); | ||
| 301 | getcontext_func = (getcontext_func_t)gate_posix_global_sym("getcontext"); | ||
| 302 | setcontext_func = (setcontext_func_t)gate_posix_global_sym("setcontext"); | ||
| 303 | |||
| 304 | if (makecontext_func && swapcontext_func && getcontext_func && setcontext_func) | ||
| 305 | { | ||
| 306 | return GATE_RESULT_OK; | ||
| 307 | } | ||
| 308 | |||
| 309 | /* try dynamic loading: */ | ||
| 310 | load_uctx_from_libucontext(); | ||
| 311 | |||
| 312 | return (makecontext_func && swapcontext_func && getcontext_func && setcontext_func) | ||
| 313 | ? GATE_RESULT_OK : GATE_RESULT_NOTSUPPORTED; | ||
| 314 | } | ||
| 315 | |||
| 316 | #endif | ||
| 317 | |||
| 318 | |||
| 319 | 11 | gate_result_t gate_posix_uctx_make(void* uctx, void(*func)(int, int, int, int), int a1, int a2, int a3, int a4) | |
| 320 | { | ||
| 321 | 11 | ucontext_t* ptr_context = (ucontext_t*)uctx; | |
| 322 | |||
| 323 |
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11 | if (!makecontext_func) |
| 324 | { | ||
| 325 | ✗ | return GATE_RESULT_NOTSUPPORTED; | |
| 326 | } | ||
| 327 | 11 | makecontext_func(ptr_context, (void(*)(void))func, 4, a1, a2, a3, a4); | |
| 328 | 11 | return GATE_RESULT_OK; | |
| 329 | } | ||
| 330 | 74 | int gate_posix_uctx_swap(void* save_ctx, void* load_ctx) | |
| 331 | { | ||
| 332 | 74 | ucontext_t* ptr_save = (ucontext_t*)save_ctx; | |
| 333 | 74 | ucontext_t* ptr_load = (ucontext_t*)load_ctx; | |
| 334 |
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74 | if (!swapcontext_func) |
| 335 | { | ||
| 336 | ✗ | return -1; | |
| 337 | } | ||
| 338 | 74 | return swapcontext_func(ptr_save, ptr_load); | |
| 339 | } | ||
| 340 | 11 | void gate_posix_uctx_setup(void* uctx, void* ptr_stack, gate_size_t stack_size) | |
| 341 | { | ||
| 342 | 11 | ucontext_t* ptr_ctx = (ucontext_t*)uctx; | |
| 343 | 11 | ptr_ctx->uc_stack.ss_sp = ptr_stack; | |
| 344 | 11 | ptr_ctx->uc_stack.ss_size = stack_size; | |
| 345 | 11 | ptr_ctx->uc_stack.ss_flags = 0; | |
| 346 | 11 | ptr_ctx->uc_link = NULL; | |
| 347 | 11 | } | |
| 348 | 11 | int gate_posix_uctx_get(void* uctx) | |
| 349 | { | ||
| 350 | 11 | ucontext_t* ptr_ctx = (ucontext_t*)uctx; | |
| 351 |
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11 | if (!getcontext_func) |
| 352 | { | ||
| 353 | ✗ | return -1; | |
| 354 | } | ||
| 355 | 11 | return getcontext_func(ptr_ctx); | |
| 356 | } | ||
| 357 | 1 | int gate_posix_uctx_set(void const* uctx) | |
| 358 | { | ||
| 359 | 1 | ucontext_t const* ptr_ctx = (ucontext_t const*)uctx; | |
| 360 |
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1 | if (!setcontext_func) |
| 361 | { | ||
| 362 | ✗ | return -1; | |
| 363 | } | ||
| 364 | 1 | return setcontext_func(ptr_ctx); | |
| 365 | } | ||
| 366 | |||
| 367 | #endif /* GATE_POSIX_UCONTEXT_NATIVE_IMPL */ | ||
| 368 |