base-hw: store Platform_pd pointer in Kernel::Pd

This enables the kernel to print out the label of the program
a thread belongs to.

fix #662

base-hw/include/kernel/syscalls.h

@@ -20,6 +20,7 @@
 namespace Genode
 {
 	class Platform_thread;
+	class Platform_pd;
 	class Tlb;
 }
 
@@ -29,6 +30,7 @@ namespace Kernel
 	typedef Genode::addr_t          addr_t;
 	typedef Genode::size_t          size_t;
 	typedef Genode::Platform_thread Platform_thread;
+	typedef Genode::Platform_pd     Platform_pd;
 
 	/**
 	 * Unique opcodes of all syscalls supported by the kernel
@@ -143,6 +145,7 @@ namespace Kernel
 	 *
 	 * \param dst  physical base of an appropriate portion of memory
 	 *             that is thereupon allocated to the kernel
+	 * \param pd   core local Platform_pd object
 	 *
 	 * \retval >0  ID of the new PD
 	 * \retval  0  if no new PD was created
@@ -150,8 +153,8 @@ namespace Kernel
 	 * Restricted to core threads. Regaining of the supplied memory is not
 	 * supported by now.
 	 */
-	inline int new_pd(void * const dst) {
+	inline int new_pd(void * const dst, Platform_pd * const pd) {
-		return syscall(NEW_PD, (Syscall_arg)dst); }
+		return syscall(NEW_PD, (Syscall_arg)dst, (Syscall_arg)pd); }
 
 
 	/**

base-hw/src/core/include/platform_pd.h

@@ -37,11 +37,11 @@ namespace Genode
 	 */
 	class Platform_pd : public Address_space
 	{
-		unsigned          _id;          /* ID of our kernel object */
+		unsigned           _id;          /* ID of our kernel object */
-		Native_capability _parent;      /* our parent interface */
+		Native_capability  _parent;      /* our parent interface */
-		Native_thread_id  _main_thread; /* the first thread that gets
+		Native_thread_id   _main_thread; /* the first thread that gets
-		                                 * executed in this PD */
+		                                  * executed in this PD */
-		char const *      _label;       /* PD-connection label */
+		char const * const _label;       /* PD-connection label */
 
 		public:
 
@@ -57,7 +57,7 @@ namespace Genode
 				                          Kernel::pd_alignm_log2()).is_ok())
 
 				/* create kernel object */
-				_id = Kernel::new_pd(kernel_pd);
+				_id = Kernel::new_pd(kernel_pd, this);
 				assert(_id);
 			}
 
@@ -102,6 +102,13 @@ namespace Genode
 			}
 
 
+			/***************
+			 ** Accessors **
+			 ***************/
+
+			char const * const label() { return _label; }
+
+
 			/*****************************
 			 ** Address-space interface **
 			 *****************************/

base-hw/src/core/kernel.cc

@@ -29,6 +29,7 @@
 
 /* core includes */
 #include <platform_thread.h>
+#include <platform_pd.h>
 #include <tlb.h>
 #include <trustzone.h>
 
@@ -268,7 +269,8 @@ namespace Kernel
 	 */
 	class Pd : public Object<Pd, MAX_PDS>
 	{
-		Tlb * const _tlb;
+		Tlb * const         _tlb;
+		Platform_pd * const _platform_pd;
 
 		/* keep ready memory for size aligned extra costs at construction */
 		enum { EXTRA_SPACE_SIZE = 2*Tlb::MAX_COSTS_PER_TRANSLATION };
@@ -279,7 +281,8 @@ namespace Kernel
 			/**
 			 * Constructor
 			 */
-			Pd(Tlb * const t) : _tlb(t)
+			Pd(Tlb * const t, Platform_pd * const platform_pd)
+			: _tlb(t), _platform_pd(platform_pd)
 			{
 				/* try to add translation for mode transition region */
 				Page_flags::access_t const flags = Page_flags::mode_transition();
@@ -322,7 +325,8 @@ namespace Kernel
 			 ** Accessors **
 			 ***************/
 
-			Tlb * tlb() { return _tlb; }
+			Tlb * const tlb() { return _tlb; }
+			Platform_pd * const platform_pd() { return _platform_pd; }
 	};
 
 
@@ -404,7 +408,7 @@ namespace Kernel
 	static Pd * core()
 	{
 		static Core_tlb tlb;
-		static Pd _pd(&tlb);
+		static Pd _pd(&tlb, 0);
 		return &_pd;
 	}
 
@@ -833,7 +837,7 @@ namespace Kernel
 		void * dst = (void *)user->user_arg_1();
 		Tlb * const tlb = new (dst) Tlb();
 		dst = (void *)((addr_t)dst + sizeof(Tlb));
-		Pd * const pd = new (dst) Pd(tlb);
+		Pd * const pd = new (dst) Pd(tlb, (Platform_pd *)user->user_arg_2());
 
 		/* return success */
 		user->user_arg_0(pd->id());