sched/tls: drop ta_argv and g_idleargv

- replaces `ta_argv` with `stackargs`
- drops `ta_argv` from `task_info_s`
- drops `g_idleargv` and checks idle accordingly

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>

include/nuttx/tls.h

@@ -122,8 +122,6 @@ struct pthread_atfork_s
 struct task_info_s
 {
   mutex_t         ta_lock;
-  int             ta_argc;                         /* Number of arguments     */
-  FAR char      **ta_argv;                         /* Name+start-up parameters     */
 #if CONFIG_TLS_TASK_NELEM > 0
   uintptr_t       ta_telem[CONFIG_TLS_TASK_NELEM]; /* Task local storage elements */
 #endif

libs/libc/stdlib/lib_getprogname.c

@@ -25,7 +25,7 @@
 #include <nuttx/config.h>
 
 #include <stdlib.h>
-#include <nuttx/tls.h>
+#include <nuttx/sched.h>
 
 /****************************************************************************
  * Public Functions
@@ -33,12 +33,18 @@
 
 /****************************************************************************
  * Name: getprogname
+ *
+ * Note that previous impl returns address in the stack of main thread when
+ * used from a pthread, that is dangerous as main thread may end earlier.
  ****************************************************************************/
 
 FAR const char *getprogname(void)
 {
-  FAR struct task_info_s *info;
+  struct stackinfo_s si;
+  FAR struct tls_info_s *ti = tls_get_info();
+  uintptr_t ret = ti ? (uintptr_t)ti + ti->tl_size : 0;
+  int rc = nxsched_get_stackinfo(0, &si);
 
-  info = task_get_info();
-  return info->ta_argv[0];
+  return (rc >= 0 && ret && ((uintptr_t)si.stack_base_ptr) > ret) ?
+           ((FAR char **)ret)[0] : NULL;
 }

sched/group/group_argvstr.c

@@ -63,12 +63,11 @@ size_t group_argvstr(FAR struct tcb_s *tcb, FAR char *args, size_t size)
   FAR struct addrenv_s *oldenv;
 #endif
 
-  /* Perform sanity checks */
+  /* Sanity checks and idle tasks */
 
-  if (!tcb || !tcb->group || !tcb->group->tg_info)
+  if (!tcb || !tcb->group || !tcb->group->tg_info || size < 1 ||
+      is_idle_task(tcb))
     {
-      /* Something is very wrong -> get out */
-
       *args = '\0';
       return 0;
     }
@@ -90,7 +89,7 @@ size_t group_argvstr(FAR struct tcb_s *tcb, FAR char *args, size_t size)
   else
 #endif
     {
-      FAR char **argv = tcb->group->tg_info->ta_argv + 1;
+      FAR char **argv = nxsched_get_stackargs(tcb) + 1;
 
       while (*argv != NULL && n < size)
         {

sched/init/nx_start.c

@@ -210,21 +210,10 @@ static struct tcb_s g_idletcb[CONFIG_SMP_NCPUS];
 
 /* This is the name of the idle task */
 
-#if CONFIG_TASK_NAME_SIZE <= 0 || !defined(CONFIG_SMP)
-#  ifdef CONFIG_SMP
-static const char g_idlename[] = "CPU_Idle";
-#  else
+#if CONFIG_TASK_NAME_SIZE > 0 && !defined(CONFIG_SMP)
 static const char g_idlename[] = "Idle_Task";
-#  endif
 #endif
 
-/* This is IDLE threads argument list.  NOTE: Normally the argument
- * list is created on the stack prior to starting the task.  We have to
- * do things little differently here for the IDLE tasks.
- */
-
-static FAR char *g_idleargv[CONFIG_SMP_NCPUS][2];
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -420,17 +409,6 @@ static void idle_task_initialize(void)
       strlcpy(tcb->name, g_idlename, CONFIG_TASK_NAME_SIZE);
 #  endif
 
-      /* Configure the task name in the argument list.  The IDLE task does
-       * not really have an argument list, but this name is still useful
-       * for things like the NSH PS command.
-       *
-       * In the kernel mode build, the arguments are saved on the task's
-       * stack and there is no support that yet.
-       */
-
-      g_idleargv[i][0] = tcb->name;
-#else
-      g_idleargv[i][0] = (FAR char *)g_idlename;
 #endif /* CONFIG_TASK_NAME_SIZE */
 
       /* Then add the idle task's TCB to the head of the current ready to
@@ -477,7 +455,6 @@ static void idle_group_initialize(void)
 
       DEBUGVERIFY(
         group_initialize((FAR struct task_tcb_s *)tcb, tcb->flags));
-      tcb->group->tg_info->ta_argv = &g_idleargv[i][0];
 
       /* Initialize the task join */
 

sched/task/task_fork.c

@@ -96,6 +96,7 @@ FAR struct task_tcb_s *nxtask_setup_fork(start_t retaddr)
   FAR struct tcb_s *ptcb = this_task();
   FAR struct tcb_s *parent;
   FAR struct task_tcb_s *child;
+  FAR char **argv;
   size_t stack_size;
   uint8_t ttype;
   int priority;
@@ -211,8 +212,8 @@ FAR struct task_tcb_s *nxtask_setup_fork(start_t retaddr)
 
   /* Setup to pass parameters to the new task */
 
-  ret = nxtask_setup_arguments(child, parent->group->tg_info->ta_argv[0],
-                               &parent->group->tg_info->ta_argv[1]);
+  argv = nxsched_get_stackargs(parent);
+  ret = nxtask_setup_arguments(child, argv[0], &argv[1]);
   if (ret < OK)
     {
       goto errout_with_tcb;

sched/task/task_setup.c

@@ -528,7 +528,6 @@ static int nxtask_setup_stackargs(FAR struct task_tcb_s *tcb,
                                   FAR const char *name,
                                   FAR char * const argv[])
 {
-  uint8_t ttype = tcb->cmn.flags & TCB_FLAG_TTYPE_MASK;
   FAR char **stackargv;
   FAR char *str;
   size_t strtablen;
@@ -632,12 +631,6 @@ static int nxtask_setup_stackargs(FAR struct task_tcb_s *tcb,
 
   stackargv[argc + 1] = NULL;
 
-  if (ttype != TCB_FLAG_TTYPE_KERNEL)
-    {
-      tcb->cmn.group->tg_info->ta_argc = argc;
-      tcb->cmn.group->tg_info->ta_argv = stackargv;
-    }
-
   return OK;
 }