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From ada98493bbfbd9af0d0b593017e29d39bcd3495e Mon Sep 17 00:00:00 2001
From: Kent Hansen <kent.hansen@nokia.com>
Date: Thu, 8 Jul 2010 17:26:50 +0000
Subject: [PATCH] Fix JIT crash on x86-64 (avoid 32-bit branch offset
overflow)
Cherry-picked from webkit commit
a5b3261a8c4386b4e14ce40a34c7fc933a5f7001
Task-number: QTBUG-23871
Change-Id: Ia028fe072b349e3a7883ae0f6f7298941cc1bc9e
Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>
(cherry picked from commit 79ebd39d0d4846cb911ae122d2059e5add568d7e in qtscript)
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>
---
.../javascriptcore/JavaScriptCore/ChangeLog | 27 +++++++++++++++++++
.../JavaScriptCore/JavaScriptCore.pri | 1 +
.../JavaScriptCore/jit/ExecutableAllocator.cpp | 21 +++++++++++++++
.../jit/ExecutableAllocatorFixedVMPool.cpp | 31 +++++++++++++++-------
.../jit/ExecutableAllocatorPosix.cpp | 29 ++------------------
.../jit/ExecutableAllocatorSymbian.cpp | 2 +-
.../JavaScriptCore/jit/ExecutableAllocatorWin.cpp | 2 +-
.../javascriptcore/JavaScriptCore/wtf/Platform.h | 10 +++++++
8 files changed, 84 insertions(+), 39 deletions(-)
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog b/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
index 9cbf0c1..5ab23e6 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/ChangeLog
@@ -1,3 +1,30 @@
+2010-07-08 Gavin Barraclough <barraclough@apple.com>
+
+ Reviewed by Sam Weinig.
+
+ https://bugs.webkit.org/show_bug.cgi?id=41641
+
+ Update compile flags to allow use of ExecutableAllocatorFixedVMPool on platforms
+ other than x86-64 (this may be useful on 32-bit platforms, too).
+
+ Simplify ifdefs by dividing into thwo broad allocation strategies
+ (ENABLE_EXECUTABLE_ALLOCATOR_FIXED & ENABLE_EXECUTABLE_ALLOCATOR_DEMAND).
+
+ Rename constant used in the code to have names descriptive of their purpose,
+ rather than their specific value on a given platform.
+
+ * jit/ExecutableAllocator.cpp:
+ (JSC::ExecutableAllocator::reprotectRegion):
+ (JSC::ExecutableAllocator::cacheFlush):
+ * jit/ExecutableAllocatorFixedVMPool.cpp:
+ (JSC::FixedVMPoolAllocator::FixedVMPoolAllocator):
+ (JSC::FixedVMPoolAllocator::free):
+ (JSC::ExecutablePool::systemAlloc):
+ * jit/ExecutableAllocatorPosix.cpp:
+ * jit/ExecutableAllocatorSymbian.cpp:
+ * jit/ExecutableAllocatorWin.cpp:
+ * wtf/Platform.h:
+
2010-08-24 Oliver Hunt <oliver@apple.com>
Reviewed by Geoff Garen.
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri b/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
index b061321..847f69c 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/JavaScriptCore.pri
@@ -100,6 +100,7 @@ SOURCES += \
interpreter/CallFrame.cpp \
interpreter/Interpreter.cpp \
interpreter/RegisterFile.cpp \
+ jit/ExecutableAllocatorFixedVMPool.cpp \
jit/ExecutableAllocatorPosix.cpp \
jit/ExecutableAllocatorSymbian.cpp \
jit/ExecutableAllocatorWin.cpp \
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.cpp
index f6b27ec..f0ebbab 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocator.cpp
@@ -33,6 +33,27 @@ namespace JSC {
size_t ExecutableAllocator::pageSize = 0;
+#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
+void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting)
+{
+ if (!pageSize)
+ intializePageSize();
+
+ // Calculate the start of the page containing this region,
+ // and account for this extra memory within size.
+ intptr_t startPtr = reinterpret_cast<intptr_t>(start);
+ intptr_t pageStartPtr = startPtr & ~(pageSize - 1);
+ void* pageStart = reinterpret_cast<void*>(pageStartPtr);
+ size += (startPtr - pageStartPtr);
+
+ // Round size up
+ size += (pageSize - 1);
+ size &= ~(pageSize - 1);
+
+ mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX);
+}
+#endif
+
}
#endif // HAVE(ASSEMBLER)
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp
index dd1db4e..16d0fb1 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorFixedVMPool.cpp
@@ -27,25 +27,33 @@
#include "ExecutableAllocator.h"
-#include <errno.h>
+#if ENABLE(EXECUTABLE_ALLOCATOR_FIXED)
-#if ENABLE(ASSEMBLER) && OS(DARWIN) && CPU(X86_64)
+#include <errno.h>
#include "TCSpinLock.h"
-#include <mach/mach_init.h>
-#include <mach/vm_map.h>
#include <sys/mman.h>
#include <unistd.h>
#include <wtf/AVLTree.h>
#include <wtf/VMTags.h>
+#if CPU(X86_64)
+ // These limits suitable on 64-bit platforms (particularly x86-64, where we require all jumps to have a 2Gb max range).
+ #define VM_POOL_SIZE (2u * 1024u * 1024u * 1024u) // 2Gb
+ #define COALESCE_LIMIT (16u * 1024u * 1024u) // 16Mb
+#else
+ // These limits are hopefully sensible on embedded platforms.
+ #define VM_POOL_SIZE (32u * 1024u * 1024u) // 32Mb
+ #define COALESCE_LIMIT (4u * 1024u * 1024u) // 4Mb
+#endif
+
+// ASLR currently only works on darwin (due to arc4random) & 64-bit (due to address space size).
+#define VM_POOL_ASLR (OS(DARWIN) && CPU(X86_64))
+
using namespace WTF;
namespace JSC {
-#define TWO_GB (2u * 1024u * 1024u * 1024u)
-#define SIXTEEN_MB (16u * 1024u * 1024u)
-
// FreeListEntry describes a free chunk of memory, stored in the freeList.
struct FreeListEntry {
FreeListEntry(void* pointer, size_t size)
@@ -291,9 +299,12 @@ public:
// for now instead of 2^26 bits of ASLR lets stick with 25 bits of randomization plus
// 2^24, which should put up somewhere in the middle of usespace (in the address range
// 0x200000000000 .. 0x5fffffffffff).
- intptr_t randomLocation = arc4random() & ((1 << 25) - 1);
+ intptr_t randomLocation = 0;
+#if VM_POOL_ASLR
+ randomLocation = arc4random() & ((1 << 25) - 1);
randomLocation += (1 << 24);
randomLocation <<= 21;
+#endif
m_base = mmap(reinterpret_cast<void*>(randomLocation), m_totalHeapSize, INITIAL_PROTECTION_FLAGS, MAP_PRIVATE | MAP_ANON, VM_TAG_FOR_EXECUTABLEALLOCATOR_MEMORY, 0);
if (!m_base)
CRASH();
@@ -387,7 +398,7 @@ public:
// 16MB of allocations have been freed, sweep m_freeList
// coalescing any neighboring fragments.
m_countFreedSinceLastCoalesce += size;
- if (m_countFreedSinceLastCoalesce >= SIXTEEN_MB) {
+ if (m_countFreedSinceLastCoalesce >= COALESCE_LIMIT) {
m_countFreedSinceLastCoalesce = 0;
coalesceFreeSpace();
}
@@ -429,7 +440,7 @@ ExecutablePool::Allocation ExecutablePool::systemAlloc(size_t size)
SpinLockHolder lock_holder(&spinlock);
if (!allocator)
- allocator = new FixedVMPoolAllocator(JIT_ALLOCATOR_LARGE_ALLOC_SIZE, TWO_GB);
+ allocator = new FixedVMPoolAllocator(JIT_ALLOCATOR_LARGE_ALLOC_SIZE, VM_POOL_SIZE);
ExecutablePool::Allocation alloc = {reinterpret_cast<char*>(allocator->alloc(size)), size};
return alloc;
}
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorPosix.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorPosix.cpp
index 2eb0c87..b04049c 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorPosix.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorPosix.cpp
@@ -27,7 +27,7 @@
#include "ExecutableAllocator.h"
-#if ENABLE(ASSEMBLER) && OS(UNIX) && !OS(SYMBIAN)
+#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && !OS(WINDOWS) && !OS(SYMBIAN)
#include <sys/mman.h>
#include <unistd.h>
@@ -35,8 +35,6 @@
namespace JSC {
-#if !(OS(DARWIN) && !PLATFORM(QT) && CPU(X86_64))
-
void ExecutableAllocator::intializePageSize()
{
ExecutableAllocator::pageSize = getpagesize();
@@ -57,29 +55,6 @@ void ExecutablePool::systemRelease(const ExecutablePool::Allocation& alloc)
ASSERT_UNUSED(result, !result);
}
-#endif // !(OS(DARWIN) && !PLATFORM(QT) && CPU(X86_64))
-
-#if ENABLE(ASSEMBLER_WX_EXCLUSIVE)
-void ExecutableAllocator::reprotectRegion(void* start, size_t size, ProtectionSeting setting)
-{
- if (!pageSize)
- intializePageSize();
-
- // Calculate the start of the page containing this region,
- // and account for this extra memory within size.
- intptr_t startPtr = reinterpret_cast<intptr_t>(start);
- intptr_t pageStartPtr = startPtr & ~(pageSize - 1);
- void* pageStart = reinterpret_cast<void*>(pageStartPtr);
- size += (startPtr - pageStartPtr);
-
- // Round size up
- size += (pageSize - 1);
- size &= ~(pageSize - 1);
-
- mprotect(pageStart, size, (setting == Writable) ? PROTECTION_FLAGS_RW : PROTECTION_FLAGS_RX);
-}
-#endif
-
}
-#endif // HAVE(ASSEMBLER)
+#endif
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorSymbian.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorSymbian.cpp
index e82975c..9028f50 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorSymbian.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorSymbian.cpp
@@ -22,7 +22,7 @@
#include "ExecutableAllocator.h"
-#if ENABLE(ASSEMBLER) && OS(SYMBIAN)
+#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && OS(SYMBIAN)
#include <e32hal.h>
#include <e32std.h>
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorWin.cpp b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorWin.cpp
index e38323c..72a1d5f 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorWin.cpp
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/jit/ExecutableAllocatorWin.cpp
@@ -27,7 +27,7 @@
#include "ExecutableAllocator.h"
-#if ENABLE(ASSEMBLER) && OS(WINDOWS)
+#if ENABLE(EXECUTABLE_ALLOCATOR_DEMAND) && OS(WINDOWS)
#include "windows.h"
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Platform.h b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Platform.h
index 700977e..d930ed7 100644
--- a/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Platform.h
+++ b/src/3rdparty/javascriptcore/JavaScriptCore/wtf/Platform.h
@@ -1016,6 +1016,16 @@ on MinGW. See https://bugs.webkit.org/show_bug.cgi?id=29268 */
#define ENABLE_ASSEMBLER_WX_EXCLUSIVE 0
#endif
+/* Pick which allocator to use; we only need an executable allocator if the assembler is compiled in.
+ On x86-64 we use a single fixed mmap, on other platforms we mmap on demand. */
+#if ENABLE(ASSEMBLER)
+#if CPU(X86_64)
+#define ENABLE_EXECUTABLE_ALLOCATOR_FIXED 1
+#else
+#define ENABLE_EXECUTABLE_ALLOCATOR_DEMAND 1
+#endif
+#endif
+
#if !defined(ENABLE_PAN_SCROLLING) && OS(WINDOWS)
#define ENABLE_PAN_SCROLLING 1
#endif
--
1.7.11.4
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