Support task_wait / task_wait_tid syscalls:

    - Add task_end2 syscall to allow pthread_exit-like retval.
    - Add/maintain task states.
    - Create task parent/child tracking tree.
    - Add task_detach function.
    - Implement wait syscalls.

Make task_exec caller the parent of spawned task:

    Previously the task_exec call caused a message to the
    VFS task, which called task_create and returned the tid
    in response to the message.  This causes the parent of
    the spawned task to appear to be the VFS task.

    Modify task_exec / VFS handling to instead return the
    entry point address on the message and have task_exec call
    task_create directly itself.

Change-Id: I6b6796f45875de37b1ab01e7596639b073820b95
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/443
Tested-by: Jenkins Server
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: Andrew J. Geissler <andrewg@us.ibm.com>

1 files changed, 7 insertions, 8 deletions

diff --git a/src/kernel/exception.C b/src/kernel/exception.C
index 6f015a57c..cbe97b220 100644
--- a/src/kernel/exception.C
+++ b/src/kernel/exception.C
@@ -29,7 +29,6 @@
 #include <kernel/vmmmgr.H>
 #include <kernel/cpuid.H>
 
-namespace Systemcalls { void TaskEnd(task_t*); }
 namespace ExceptionHandles
 {
     bool HvEmulation(task_t*);
@@ -54,7 +53,7 @@ void kernel_execute_prog_ex()
     if (!handled)
     {
 	printk("Program exception, killing task %d\n", t->tid);
-	Systemcalls::TaskEnd(t);
+	TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
     }
 }
 
@@ -78,7 +77,7 @@ void kernel_execute_data_storage()
     {
 	printk("Data Storage exception on %d: %lx, %lx\n",
 	       t->tid, getDAR(), getDSISR());
-	Systemcalls::TaskEnd(t);
+	TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
     }
 }
 
@@ -87,7 +86,7 @@ void kernel_execute_data_segment()
 {
     task_t* t = TaskManager::getCurrentTask();
     printk("Data Segment exception, killing task %d\n", t->tid);
-    Systemcalls::TaskEnd(t);
+    TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
 }
 
 const uint64_t EXCEPTION_SRR1_INSTR_MASK    = 0x0000000040000000;
@@ -110,7 +109,7 @@ void kernel_execute_inst_storage()
     {
         printk("Inst Storage exception on %d: %lx, %lx\n",
                t->tid, getSRR0(), getSRR1());
-        Systemcalls::TaskEnd(t);
+	TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
     }
 }
 
@@ -119,7 +118,7 @@ void kernel_execute_inst_segment()
 {
     task_t* t = TaskManager::getCurrentTask();
     printk("Inst Segment exception, killing task %d\n", t->tid);
-    Systemcalls::TaskEnd(t);
+    TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
 }
 
 extern "C"
@@ -127,7 +126,7 @@ void kernel_execute_alignment()
 {
     task_t* t = TaskManager::getCurrentTask();
     printk("Alignment exception, killing task %d\n", t->tid);
-    Systemcalls::TaskEnd(t);
+    TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
 }
 
 extern "C"
@@ -136,7 +135,7 @@ void kernel_execute_hype_emu_assist()
     task_t* t = TaskManager::getCurrentTask();
     printk("HypeEmu: Illegal instruction in task %d\n"
            "\tHSSR0 = %lx, HEIR = %lx\n", t->tid, getHSRR0(), getHEIR());
-    Systemcalls::TaskEnd(t);
+    TaskManager::endTask(t, NULL, TASK_STATUS_CRASHED);
 }
 
 namespace ExceptionHandles