Debug improvements for exceptions and OOM hangs

There are two main changes in this commit:
1) Forcing an assert if we cannot allocate pages after
10,000 attempts to yield.
2) Adding a backtrace for a lot of exception paths.

Change-Id: I755ada753b78abed56e553f7c669f0f98ae68700
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/58224
Tested-by: Jenkins Server <pfd-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>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Prachi Gupta <pragupta@us.ibm.com>
Reviewed-by: Thi N. Tran <thi@us.ibm.com>
Reviewed-by: William G. Hoffa <wghoffa@us.ibm.com>

2 files changed, 35 insertions, 6 deletions

diff --git a/src/usr/testcore/kernel/taskwaittest.H b/src/usr/testcore/kernel/taskwaittest.H
index 2d4a39772..a929dcd9a 100644
--- a/src/usr/testcore/kernel/taskwaittest.H
+++ b/src/usr/testcore/kernel/taskwaittest.H
@@ -5,7 +5,9 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* COPYRIGHT International Business Machines Corp. 2011,2014              */
+/* Contributors Listed Below - COPYRIGHT 2011,2018                        */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
 /*                                                                        */
 /* Licensed under the Apache License, Version 2.0 (the "License");        */
 /* you may not use this file except in compliance with the License.       */
@@ -168,7 +170,7 @@ class TaskWaitTest : public CxxTest::TestSuite
 
         static void* TaskThatCrashes(void* unused)
         {
-            printk("Test case: Expect to see uncaught exception! ");
+            printk("TaskThatCrashes: Expect to see uncaught exception! ");
             *(int64_t*)(0) = 0xDEADC0DE;
             return NULL;
         }
diff --git a/src/usr/testcore/kernel/vmmbasetest.H b/src/usr/testcore/kernel/vmmbasetest.H
index 5a3c0d0f8..c4d42116e 100644
--- a/src/usr/testcore/kernel/vmmbasetest.H
+++ b/src/usr/testcore/kernel/vmmbasetest.H
@@ -5,7 +5,9 @@
 /*                                                                        */
 /* OpenPOWER HostBoot Project                                             */
 /*                                                                        */
-/* COPYRIGHT International Business Machines Corp. 2011,2014              */
+/* Contributors Listed Below - COPYRIGHT 2011,2018                        */
+/* [+] International Business Machines Corp.                              */
+/*                                                                        */
 /*                                                                        */
 /* Licensed under the Apache License, Version 2.0 (the "License");        */
 /* you may not use this file except in compliance with the License.       */
@@ -44,7 +46,7 @@ class VmmBaseTest : public CxxTest::TestSuite
         {
             int status;
 
-            printk("Test case: Expect to see uncaught exception! ");
+            printk("testNullAccess1: Expect to see uncaught exception! ");
             tid_t child = task_create(readFromNULL, NULL);
 
             if ((child != task_wait_tid(child, &status, NULL)) ||
@@ -53,7 +55,7 @@ class VmmBaseTest : public CxxTest::TestSuite
                 TS_FAIL("Write to NULL not caught.");
             }
 
-            printk("Test case: Expect to see uncaught exception! ");
+            printk("testNullAccess2: Expect to see uncaught exception! ");
             child = task_create(writeToNULL, NULL);
             if ((child != task_wait_tid(child, &status, NULL)) ||
                 (status != TASK_STATUS_CRASHED))
@@ -66,7 +68,7 @@ class VmmBaseTest : public CxxTest::TestSuite
         {
             int status;
 
-            printk("Test case: Expect to see uncaught exception! ");
+            printk("testWriteToKernelCode: Expect to see uncaught exception! ");
             tid_t child = task_create(writeToKernelCode, NULL);
             if ((child != task_wait_tid(child, &status, NULL)) ||
                 (status != TASK_STATUS_CRASHED))
@@ -134,6 +136,21 @@ class VmmBaseTest : public CxxTest::TestSuite
             }
         }
 
+        void testHugeMalloc()
+        {
+            int status;
+
+            printk("testHugeMalloc: Expect to see uncaught exception! ");isync();
+
+            tid_t child = task_create(bigMalloc, NULL);
+
+            if ((child != task_wait_tid(child, &status, NULL)) ||
+                (status != TASK_STATUS_CRASHED))
+            {
+                TS_FAIL("testHugeMalloc> Giant malloc didn't crash.");
+            }
+        }
+
     private:
 
         static void* readFromNULL(void* unused)
@@ -180,6 +197,16 @@ class VmmBaseTest : public CxxTest::TestSuite
             return NULL;
         }
 
+        static void* bigMalloc(void* unused)
+        {
+            uint8_t* ptr = (uint8_t*)malloc(VMM_MEMORY_SIZE);
+            for( size_t x=0; x<(VMM_MEMORY_SIZE); x+=MEGABYTE )
+            {
+                ptr[x] = x;
+            }
+            return NULL;
+        }
+
 };
 msg_q_t VmmBaseTest::iv_mq = msg_q_create();