arch: fix addrenv_switch changing this_task causing exceptions

After addrenv_switch(), the current running task (this_task) may change due to
deferred work execution. Update all architecture interrupt, syscall, and exit
handlers to re-fetch tcb = this_task() after addrenv_switch(). Ensures scheduler
and context operations use the correct TCB, preventing context corruption and
exceptions across SMP and memory-protected builds.

Signed-off-by: hujun5 <hujun5@xiaomi.com>

arch/x86/src/common/x86_exit.c

@@ -67,12 +67,6 @@ void up_exit(int status)
 
   tcb = this_task();
 
-  /* Adjusts time slice for SCHED_RR & SCHED_SPORADIC cases
-   * NOTE: the API also adjusts the global IRQ control for SMP
-   */
-
-  g_running_tasks[this_cpu()] = tcb;
-
 #ifdef CONFIG_ARCH_ADDRENV
   /* Make sure that the address environment for the previously running
    * task is closed down gracefully (data caches dump, MMU flushed) and
@@ -81,8 +75,15 @@ void up_exit(int status)
    */
 
   addrenv_switch(tcb);
+  tcb = this_task();
 #endif
 
+  /* Adjusts time slice for SCHED_RR & SCHED_SPORADIC cases
+   * NOTE: the API also adjusts the global IRQ control for SMP
+   */
+
+  g_running_tasks[this_cpu()] = tcb;
+
   /* Then switch contexts */
 
   x86_fullcontextrestore(tcb->xcp.regs);

arch/x86/src/common/x86_switchcontext.c

@@ -91,6 +91,7 @@ void up_switch_context(struct tcb_s *tcb, struct tcb_s *rtcb)
        */
 
       addrenv_switch(tcb);
+      tcb = this_task();
 #endif
       /* Update scheduler parameters */
 

arch/x86/src/qemu/qemu_handlers.c

@@ -121,6 +121,7 @@ static uint32_t *common_handler(int irq, uint32_t *regs)
        */
 
       addrenv_switch(tcb);
+      tcb = this_task();
 #endif
 
       /* Update scheduler parameters */