Support thread local storage

Generally adds support to declare variables as thread_local

- Add support in HBRT start assembly to skip adjusting TLS relocations
- Add support in linker to generate tagged TLS entries
- Update linker to process TLS relocations correctly
- Update TLS code to ignore top half of module ID
- Update module images to hold a "module ID"
- Update custome linker to update module ID during binary link
- Update TLS code to track TLS sections via module ID

Change-Id: I1589550d7787beb08827ca24a728397dedf0373b
RTC: 147599
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/71709
Reviewed-by: Ilya Smirnov <ismirno@us.ibm.com>
Reviewed-by: Michael Baiocchi <mbaiocch@us.ibm.com>
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Tested-by: Jenkins OP HW <op-hw-jenkins+hostboot@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>

2 files changed, 16 insertions, 4 deletions

diff --git a/src/usr/module_init.C b/src/usr/module_init.C
index 3e9a25e58..91df9a952 100644
--- a/src/usr/module_init.C
+++ b/src/usr/module_init.C
@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2011,2015                        */
+/* Contributors Listed Below - COPYRIGHT 2011,2019                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -22,20 +22,32 @@
 /* permissions and limitations under the License.                         */
 /*                                                                        */
 /* IBM_PROLOG_END_TAG                                                     */
+
+#include <stdint.h>
+
 void call_dtors(void * i_dso_handle);
-void __tls_register(void * tls_start, void * tls_end);
+
+/**
+ *  @note: See documentation in src/lib/tls.C
+ */
+void __tls_register(void * tls_start, void * tls_end,const size_t i_module);
+
 void __tls_unregister(void * tls_start, void * tls_end);
 
 // This identifies the module
 void*   __dso_handle = (void*) &__dso_handle;
 
+// TLS Module ID to be updated by custom linker during final binary creation.
+// Set to max ID so that if it's not replaced, it will lead to obvious crashes.
+size_t TLS_MODULE_ID = 0xFFFFFFFFFFFFFFFFULL;
+
 extern "C"
 void _init(void*)
 {
     // Register thread-local storage.
     extern void* tls_start_address;
     extern void* tls_end_address;
-    __tls_register(&tls_start_address, &tls_end_address);
+    __tls_register(&tls_start_address, &tls_end_address, TLS_MODULE_ID);
 
     // Call default constructors for any static objects.
     extern void (*ctor_start_address)();
diff --git a/src/usr/testcore/rtloader/loader.H b/src/usr/testcore/rtloader/loader.H
index 1c4423484..64db72dc4 100644
--- a/src/usr/testcore/rtloader/loader.H
+++ b/src/usr/testcore/rtloader/loader.H
@@ -228,7 +228,7 @@ class RuntimeLoaderTest : public CxxTest::TestSuite
                          "std 2, 40(1); bctrl; ld 2, 40(1); "
                          "mr %0, 3" :
                 "=r" (result) : "r" (entry), "r" (param0), "r" (param1) :
-                "lr","ctr","r0","r3","r4","r5","r6","r7","r8","r9",
+                "lr","ctr","cr0","r0","r3","r4","r5","r6","r7","r8","r9",
                 "r10","r11"); // TODO: Need to double check the ABI here.
 
             return result;