base: add 'Thread::mystack() function

The static 'Thread::mystack()' function returns the stack boundaries of
the calling thread. It is useful when a thread uses a diffent stack than
the primary one.

Fixes #2037

repos/base/include/base/thread.h

@@ -51,6 +51,8 @@ class Genode::Thread
 		typedef Cpu_session::Name   Name;
 		typedef Cpu_session::Weight Weight;
 
+		struct Stack_info { addr_t base; addr_t top; };
+
 	private:
 
 		/**
@@ -319,14 +321,14 @@ class Genode::Thread
 		Native_thread &native_thread();
 
 		/**
-		 * Return top of stack
+		 * Return top of primary stack
 		 *
 		 * \return  pointer just after first stack element
 		 */
 		void *stack_top() const;
 
 		/**
-		 * Return base of stack
+		 * Return base of primary stack
 		 *
 		 * \return  pointer to last stack element
 		 */
@@ -354,6 +356,11 @@ class Genode::Thread
 		 */
 		static Thread *myself();
 
+		/**
+		 * Return information about the current stack
+		 */
+		static Stack_info mystack();
+
 		/**
 		 * Ensure that the stack has a given size at the minimum
 		 *

repos/base/src/lib/base/thread.cc

@@ -190,6 +190,14 @@ void *Thread::stack_base() const { return (void*)_stack->base(); }
 void Thread::stack_size(size_t const size) { _stack->size(size); }
 
 
+Thread::Stack_info Thread::mystack()
+{
+	addr_t base = Stack_allocator::addr_to_base(&base);
+	Stack *stack = Stack_allocator::base_to_stack(base);
+	return { stack->base(), stack->top() };
+}
+
+
 size_t Thread::stack_virtual_size()
 {
 	return Genode::stack_virtual_size();

repos/libports/ports/qt5.hash

@@ -1 +1 @@
-9ad059d85f8ad1282da3e939b5f187173b580ab2
+2db8119ea245fc40501d00968f364e0092a7f090

repos/libports/src/lib/qt5/patches/qt5_qtwebkit.patch

@@ -12,10 +12,10 @@ From: Christian Prochaska <christian.prochaska@genode-labs.com>
  qtwebkit/Source/WTF/wtf/OSAllocatorPosix.cpp       |   13 ++++++++++++
  qtwebkit/Source/WTF/wtf/OSRandomSource.cpp         |    8 ++++++++
  qtwebkit/Source/WTF/wtf/Platform.h                 |   19 +++++++++++++++---
- qtwebkit/Source/WTF/wtf/StackBounds.cpp            |   12 +++++++++++
+ qtwebkit/Source/WTF/wtf/StackBounds.cpp            |   13 ++++++++++++
  qtwebkit/Source/WTF/wtf/TCSystemAlloc.cpp          |   21 ++++++++++++++++++++
  .../platform/graphics/qt/MediaPlayerPrivateQt.cpp  |    3 +++
- 11 files changed, 96 insertions(+), 6 deletions(-)
+ 11 files changed, 97 insertions(+), 6 deletions(-)
 
 diff --git a/qtwebkit/Source/JavaScriptCore/dfg/DFGOperations.cpp b/qtwebkit/Source/JavaScriptCore/dfg/DFGOperations.cpp
 index bb9ccc3..077cbed 100644
@@ -236,7 +236,7 @@ index 35fa7e3..89e6205 100644
  
  /* Setting this flag compares JIT results with interpreter results. */
 diff --git a/qtwebkit/Source/WTF/wtf/StackBounds.cpp b/qtwebkit/Source/WTF/wtf/StackBounds.cpp
-index a272ce3..a2e7484 100644
+index a272ce3..65a5a1f 100644
 --- a/qtwebkit/Source/WTF/wtf/StackBounds.cpp
 +++ b/qtwebkit/Source/WTF/wtf/StackBounds.cpp
 @@ -44,6 +44,10 @@
@@ -250,7 +250,7 @@ index a272ce3..a2e7484 100644
  #elif OS(UNIX)
  
  #include <pthread.h>
-@@ -128,6 +132,14 @@ void StackBounds::initialize()
+@@ -128,6 +132,15 @@ void StackBounds::initialize()
      m_bound = estimateStackBound(m_origin);
  }
  
@@ -258,8 +258,9 @@ index a272ce3..a2e7484 100644
 +
 +void StackBounds::initialize()
 +{
-+    m_bound = Genode::Thread::myself()->stack_base();
-+    m_origin = Genode::Thread::myself()->stack_top();
++    Genode::Thread::Stack_info stack_info = Genode::Thread::mystack();
++    m_bound = (void*)stack_info.base;
++    m_origin = (void*)stack_info.top;
 +}
 +
  #elif OS(UNIX)