JIT: When making memory writable, include the exception handler

makeWritable() rounds the memory down to the next page boundary. Usually
we include the exception handler this way, unless the offset from the
page boundary is less than the exception handler size. Make it explicit
that we do want the exception handler to be writable, too.

Fixes: QTBUG-89513
Change-Id: I2fb8fb0e1dcc3450b036924463dc1b40d2020c46
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit 86a595b126bc6794380dc00af80ec4802f7d058c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/src/3rdparty/masm/stubs/ExecutableAllocator.h b/src/3rdparty/masm/stubs/ExecutableAllocator.h
index a439c53827..f984704023 100644
--- a/src/3rdparty/masm/stubs/ExecutableAllocator.h
+++ b/src/3rdparty/masm/stubs/ExecutableAllocator.h
@@ -82,9 +82,14 @@ struct ExecutableMemoryHandle : public RefCounted<ExecutableMemoryHandle> {
 
     inline bool isManaged() const { return true; }
 
-    void *exceptionHandler() { return m_allocation->exceptionHandler(); }
-    void *start() { return m_allocation->start(); }
-    size_t sizeInBytes() { return m_size; }
+    void *memoryStart() { return m_allocation->memoryStart(); }
+    size_t memorySize() { return m_allocation->memorySize(); }
+
+    void *exceptionHandlerStart() { return m_allocation->exceptionHandlerStart(); }
+    size_t exceptionHandlerSize() { return m_allocation->exceptionHandlerSize(); }
+
+    void *codeStart() { return m_allocation->codeStart(); }
+    size_t codeSize() { return m_size; }
 
     QV4::ExecutableAllocator::ChunkOfPages *chunk() const
     { return m_allocator->chunkForAllocation(m_allocation); }