projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 34e8f829 A |
1 | /* |
| 2 | * Copyright (c) 2007, 2008, 2009 Apple Inc. All rights reserved. | |
| 3 | * | |
| 4 | * @APPLE_LICENSE_HEADER_START@ | |
| 5 | * | |
| 6 | * This file contains Original Code and/or Modifications of Original Code | |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. Please obtain a copy of the License at | |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 11 | * file. | |
| 12 | * | |
| 13 | * The Original Code and all software distributed under the License are | |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 18 | * Please see the License for the specific language governing rights and | |
| 19 | * limitations under the License. | |
| 20 | * | |
| 21 | * @APPLE_LICENSE_HEADER_END@ | |
| 22 | */ | |
| 23 | ||
| 24 | #if defined(__x86_64__) | |
| 25 | ||
| 26 | #define _XOPEN_SOURCE 600L | |
| 27 | ||
| 28 | #include <stdint.h> | |
| 29 | #include <stdlib.h> | |
| 30 | #include <string.h> | |
| 31 | #include <pthread.h> | |
| 32 | #include <signal.h> | |
| 33 | #include <ucontext.h> | |
| 34 | ||
| 35 | extern size_t pthread_get_stacksize_np(pthread_t); | |
| 36 | extern void *pthread_get_stackaddr_np(pthread_t); | |
| 37 | #ifdef __DYNAMIC__ | |
| 38 | extern int __in_sigtramp; | |
| 39 | #endif /* __DYNAMIC_ */ | |
| 40 | ||
| 41 | __private_extern__ mcontext_t | |
| 42 | getmcontext(ucontext_t *uctx, void *sp) | |
| 43 | { | |
| 44 | pthread_t self = pthread_self(); | |
| 45 | mcontext_t mctx = (mcontext_t)&uctx->__mcontext_data; | |
| 46 | size_t stacksize = pthread_get_stacksize_np(self); | |
| 47 | stack_t stack; | |
| 48 | ||
| 49 | uctx->uc_stack.ss_sp = sp; | |
| 50 | uctx->uc_stack.ss_flags = 0; | |
| 51 | ||
| 52 | if (0 == sigaltstack(NULL, &stack)) { | |
| 53 | if (stack.ss_flags & SS_ONSTACK) { | |
| 54 | uctx->uc_stack = stack; | |
| 55 | stacksize = stack.ss_size; | |
| 56 | } | |
| 57 | } | |
| 58 | ||
| 59 | if (stacksize == 0) { /* main thread doesn't have pthread stack size */ | |
| 60 | struct rlimit rlim; | |
| 61 | if (0 == getrlimit(RLIMIT_STACK, &rlim)) | |
| 62 | stacksize = rlim.rlim_cur; | |
| 63 | } | |
| 64 | ||
| 65 | uctx->uc_stack.ss_size = stacksize; | |
| 66 | ||
| 67 | if (uctx->uc_mcontext != mctx) { | |
| 68 | uctx->uc_mcontext = mctx; | |
| 69 | ||
| 70 | #ifdef __DYNAMIC__ | |
| 1f2f436a | 71 | uctx->uc_link = (ucontext_t*)(uintptr_t)__in_sigtramp; /* non-zero if in signal handler */ |
| 34e8f829 A |
72 | #else /* !__DYNAMIC__ */ |
| 73 | uctx->uc_link = 0; | |
| 74 | #endif /* __DYNAMIC__ */ | |
| 75 | ||
| 76 | } | |
| 77 | ||
| 78 | sigprocmask(0, NULL, &uctx->uc_sigmask); | |
| 79 | return mctx; | |
| 80 | } | |
| 81 | ||
| 82 | #endif /* __x86_64__ */ |