1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/js/src/jsnativestack.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,162 @@
1.4 +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
1.5 + * vim: set ts=8 sts=4 et sw=4 tw=99:
1.6 + * This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#include "jsnativestack.h"
1.11 +
1.12 +#ifdef XP_WIN
1.13 +# include "jswin.h"
1.14 +
1.15 +#elif defined(XP_MACOSX) || defined(DARWIN) || defined(XP_UNIX)
1.16 +# include <pthread.h>
1.17 +
1.18 +# if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
1.19 +# include <pthread_np.h>
1.20 +# endif
1.21 +
1.22 +# if defined(ANDROID)
1.23 +# include <sys/types.h>
1.24 +# include <unistd.h>
1.25 +# endif
1.26 +
1.27 +#else
1.28 +# error "Unsupported platform"
1.29 +
1.30 +#endif
1.31 +
1.32 +#if defined(XP_WIN)
1.33 +
1.34 +void *
1.35 +js::GetNativeStackBaseImpl()
1.36 +{
1.37 +# if defined(_M_IX86) && defined(_MSC_VER)
1.38 + /*
1.39 + * offset 0x18 from the FS segment register gives a pointer to
1.40 + * the thread information block for the current thread
1.41 + */
1.42 + NT_TIB* pTib;
1.43 + __asm {
1.44 + MOV EAX, FS:[18h]
1.45 + MOV pTib, EAX
1.46 + }
1.47 + return static_cast<void*>(pTib->StackBase);
1.48 +
1.49 +# elif defined(_M_X64)
1.50 + PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb());
1.51 + return reinterpret_cast<void*>(pTib->StackBase);
1.52 +
1.53 +# elif defined(_WIN32) && defined(__GNUC__)
1.54 + NT_TIB* pTib;
1.55 + asm ("movl %%fs:0x18, %0\n" : "=r" (pTib));
1.56 + return static_cast<void*>(pTib->StackBase);
1.57 +
1.58 +# endif
1.59 +}
1.60 +
1.61 +#elif defined(SOLARIS)
1.62 +
1.63 +#include <ucontext.h>
1.64 +
1.65 +JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
1.66 +
1.67 +void *
1.68 +js::GetNativeStackBaseImpl()
1.69 +{
1.70 + stack_t st;
1.71 + stack_getbounds(&st);
1.72 + return static_cast<char*>(st.ss_sp) + st.ss_size;
1.73 +}
1.74 +
1.75 +#elif defined(AIX)
1.76 +
1.77 +#include <ucontext.h>
1.78 +
1.79 +JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
1.80 +
1.81 +void *
1.82 +js::GetNativeStackBaseImpl()
1.83 +{
1.84 + ucontext_t context;
1.85 + getcontext(&context);
1.86 + return static_cast<char*>(context.uc_stack.ss_sp) +
1.87 + context.uc_stack.ss_size;
1.88 +}
1.89 +
1.90 +#else /* XP_UNIX */
1.91 +
1.92 +void *
1.93 +js::GetNativeStackBaseImpl()
1.94 +{
1.95 + pthread_t thread = pthread_self();
1.96 +# if defined(XP_MACOSX) || defined(DARWIN)
1.97 + return pthread_get_stackaddr_np(thread);
1.98 +
1.99 +# else
1.100 + pthread_attr_t sattr;
1.101 + pthread_attr_init(&sattr);
1.102 +# if defined(__OpenBSD__)
1.103 + stack_t ss;
1.104 +# elif defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(NETBSD)
1.105 + /* e.g. on FreeBSD 4.8 or newer, neundorf@kde.org */
1.106 + pthread_attr_get_np(thread, &sattr);
1.107 +# else
1.108 + /*
1.109 + * FIXME: this function is non-portable;
1.110 + * other POSIX systems may have different np alternatives
1.111 + */
1.112 + pthread_getattr_np(thread, &sattr);
1.113 +# endif
1.114 +
1.115 + void *stackBase = 0;
1.116 + size_t stackSize = 0;
1.117 + int rc;
1.118 +# if defined(__OpenBSD__)
1.119 + rc = pthread_stackseg_np(pthread_self(), &ss);
1.120 + stackBase = (void*)((size_t) ss.ss_sp - ss.ss_size);
1.121 + stackSize = ss.ss_size;
1.122 +# elif defined(ANDROID)
1.123 + if (gettid() == getpid()) {
1.124 + // bionic's pthread_attr_getstack doesn't tell the truth for the main
1.125 + // thread (see bug 846670). So we scan /proc/self/maps to find the
1.126 + // segment which contains the stack.
1.127 + rc = -1;
1.128 + FILE *fs = fopen("/proc/self/maps", "r");
1.129 + if (fs) {
1.130 + char line[100];
1.131 + unsigned long stackAddr = (unsigned long)&sattr;
1.132 + while (fgets(line, sizeof(line), fs) != nullptr) {
1.133 + unsigned long stackStart;
1.134 + unsigned long stackEnd;
1.135 + if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 &&
1.136 + stackAddr >= stackStart && stackAddr < stackEnd) {
1.137 + stackBase = (void *)stackStart;
1.138 + stackSize = stackEnd - stackStart;
1.139 + rc = 0;
1.140 + break;
1.141 + }
1.142 + }
1.143 + fclose(fs);
1.144 + }
1.145 + } else
1.146 + // For non main-threads pthread allocates the stack itself so it tells
1.147 + // the truth.
1.148 + rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
1.149 +# else
1.150 + rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
1.151 +# endif
1.152 + if (rc)
1.153 + MOZ_CRASH();
1.154 + JS_ASSERT(stackBase);
1.155 + pthread_attr_destroy(&sattr);
1.156 +
1.157 +# if JS_STACK_GROWTH_DIRECTION > 0
1.158 + return stackBase;
1.159 +# else
1.160 + return static_cast<char*>(stackBase) + stackSize;
1.161 +# endif
1.162 +# endif
1.163 +}
1.164 +
1.165 +#endif /* !XP_WIN */
