mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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242 lines
6.4 KiB
C++
242 lines
6.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 et sw=4 tw=80:
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla code.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include <stdlib.h>
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#include "jstypes.h"
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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_OS2)
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# define INCL_DOSPROCESS
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# include <os2.h>
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#elif defined(XP_MACOSX) || defined(DARWIN) || defined(XP_UNIX)
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# include <pthread.h>
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# if defined(__FreeBSD__)
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# include <pthread_np.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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namespace js {
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#if defined(XP_WIN) && defined(WINCE)
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inline bool
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isPageWritable(void *page)
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{
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MEMORY_BASIC_INFORMATION memoryInformation;
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jsuword result = VirtualQuery(page, &memoryInformation, sizeof(memoryInformation));
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/* return false on error, including ptr outside memory */
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if (result != sizeof(memoryInformation))
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return false;
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jsuword protect = memoryInformation.Protect & ~(PAGE_GUARD | PAGE_NOCACHE);
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return protect == PAGE_READWRITE ||
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protect == PAGE_WRITECOPY ||
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protect == PAGE_EXECUTE_READWRITE ||
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protect == PAGE_EXECUTE_WRITECOPY;
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}
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void *
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GetNativeStackBase()
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{
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/* find the address of this stack frame by taking the address of a local variable */
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bool isGrowingDownward = JS_STACK_GROWTH_DIRECTION < 0;
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void *thisFrame = (void *)(&isGrowingDownward);
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static jsuword pageSize = 0;
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if (!pageSize) {
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SYSTEM_INFO systemInfo;
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GetSystemInfo(&systemInfo);
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pageSize = systemInfo.dwPageSize;
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}
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/* scan all of memory starting from this frame, and return the last writeable page found */
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register char *currentPage = (char *)((jsuword)thisFrame & ~(pageSize - 1));
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if (isGrowingDownward) {
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while (currentPage > 0) {
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/* check for underflow */
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if (currentPage >= (char *)pageSize)
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currentPage -= pageSize;
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else
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currentPage = 0;
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if (!isPageWritable(currentPage))
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return currentPage + pageSize;
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}
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return 0;
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} else {
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while (true) {
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/* guaranteed to complete because isPageWritable returns false at end of memory */
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currentPage += pageSize;
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if (!isPageWritable(currentPage))
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return currentPage;
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}
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}
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}
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#elif defined(XP_WIN)
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void *
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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(_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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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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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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#elif defined(XP_OS2)
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void *
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GetNativeStackBaseImpl()
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{
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PTIB ptib;
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PPIB ppib;
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DosGetInfoBlocks(&ptib, &ppib);
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return ptib->tib_pstacklimit;
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}
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#else /* XP_UNIX */
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void *
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GetNativeStackBaseImpl()
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{
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pthread_t thread = pthread_self();
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# if defined(XP_MACOSX) || 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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# ifdef DEBUG
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int rc =
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# endif
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# if defined(__OpenBSD__)
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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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# else
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pthread_attr_getstack(&sattr, &stackBase, &stackSize);
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# endif
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JS_ASSERT(!rc);
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JS_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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} /* namespace js */
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