| | 1 | /* |
| | 2 | * Copyright (c) 2007, 2008, 2009, 2010 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(__i386__) |
| | 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__ |
| | 71 | uctx->uc_link = (ucontext_t*)__in_sigtramp; /* non-zero if in signal handler */ |
| | 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 /* __i386__ */ |
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