mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-28 20:56:36 +00:00
175 lines
4.6 KiB
C++
175 lines
4.6 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "jsnativestack.h"
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#ifdef XP_WIN
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# include "jswin.h"
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#elif defined(XP_DARWIN) || defined(DARWIN) || defined(XP_UNIX)
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# include <pthread.h>
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# if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
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# include <pthread_np.h>
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# endif
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# if defined(ANDROID)
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# include <sys/types.h>
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# include <unistd.h>
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# endif
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#else
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# error "Unsupported platform"
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#endif
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#if defined(XP_WIN)
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void*
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js::GetNativeStackBaseImpl()
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{
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# if defined(_M_IX86) && defined(_MSC_VER)
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/*
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* offset 0x18 from the FS segment register gives a pointer to
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* the thread information block for the current thread
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*/
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NT_TIB* pTib;
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__asm {
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MOV EAX, FS:[18h]
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MOV pTib, EAX
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}
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return static_cast<void*>(pTib->StackBase);
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# elif defined(_M_X64)
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PNT_TIB64 pTib = reinterpret_cast<PNT_TIB64>(NtCurrentTeb());
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return reinterpret_cast<void*>(pTib->StackBase);
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# elif defined(_M_ARM)
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PNT_TIB pTib = reinterpret_cast<PNT_TIB>(NtCurrentTeb());
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return static_cast<void*>(pTib->StackBase);
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# elif defined(_WIN32) && defined(__GNUC__)
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NT_TIB* pTib;
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asm ("movl %%fs:0x18, %0\n" : "=r" (pTib));
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return static_cast<void*>(pTib->StackBase);
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# endif
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}
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#elif defined(SOLARIS)
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#include <ucontext.h>
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JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
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void*
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js::GetNativeStackBaseImpl()
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{
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stack_t st;
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stack_getbounds(&st);
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return static_cast<char*>(st.ss_sp) + st.ss_size;
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}
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#elif defined(AIX)
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#include <ucontext.h>
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JS_STATIC_ASSERT(JS_STACK_GROWTH_DIRECTION < 0);
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void*
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js::GetNativeStackBaseImpl()
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{
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ucontext_t context;
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getcontext(&context);
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return static_cast<char*>(context.uc_stack.ss_sp) +
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context.uc_stack.ss_size;
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}
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#else /* XP_UNIX */
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void*
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js::GetNativeStackBaseImpl()
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{
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pthread_t thread = pthread_self();
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# if defined(XP_DARWIN) || defined(DARWIN)
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return pthread_get_stackaddr_np(thread);
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# else
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pthread_attr_t sattr;
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pthread_attr_init(&sattr);
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# if defined(__OpenBSD__)
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stack_t ss;
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# elif defined(PTHREAD_NP_H) || defined(_PTHREAD_NP_H_) || defined(NETBSD)
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/* e.g. on FreeBSD 4.8 or newer, neundorf@kde.org */
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pthread_attr_get_np(thread, &sattr);
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# else
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/*
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* FIXME: this function is non-portable;
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* other POSIX systems may have different np alternatives
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*/
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pthread_getattr_np(thread, &sattr);
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# endif
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void* stackBase = 0;
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size_t stackSize = 0;
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int rc;
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# if defined(__OpenBSD__)
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rc = pthread_stackseg_np(pthread_self(), &ss);
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stackBase = (void*)((size_t) ss.ss_sp - ss.ss_size);
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stackSize = ss.ss_size;
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# elif defined(ANDROID)
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if (gettid() == getpid()) {
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// bionic's pthread_attr_getstack doesn't tell the truth for the main
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// thread (see bug 846670). So we scan /proc/self/maps to find the
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// segment which contains the stack.
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rc = -1;
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// Put the string on the stack, otherwise there is the danger that it
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// has not been decompressed by the the on-demand linker. Bug 1165460.
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//
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// The volatile keyword should stop the compiler from trying to omit
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// the stack copy in the future (hopefully).
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volatile char path[] = "/proc/self/maps";
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FILE* fs = fopen((const char*)path, "r");
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if (fs) {
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char line[100];
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unsigned long stackAddr = (unsigned long)&sattr;
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while (fgets(line, sizeof(line), fs) != nullptr) {
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unsigned long stackStart;
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unsigned long stackEnd;
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if (sscanf(line, "%lx-%lx ", &stackStart, &stackEnd) == 2 &&
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stackAddr >= stackStart && stackAddr < stackEnd) {
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stackBase = (void*)stackStart;
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stackSize = stackEnd - stackStart;
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rc = 0;
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break;
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}
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}
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fclose(fs);
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}
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} else
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// For non main-threads pthread allocates the stack itself so it tells
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// the truth.
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rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
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# else
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rc = pthread_attr_getstack(&sattr, &stackBase, &stackSize);
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# endif
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if (rc)
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MOZ_CRASH();
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MOZ_ASSERT(stackBase);
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pthread_attr_destroy(&sattr);
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# if JS_STACK_GROWTH_DIRECTION > 0
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return stackBase;
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# else
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return static_cast<char*>(stackBase) + stackSize;
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# endif
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# endif
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}
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#endif /* !XP_WIN */
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