debug(sched): create_thread 打印 tid/func/stack 实际值，定位线程首次调度跳栈 #UD（rip 在栈区域）根因

VKernel/Kernel/sched/sched.vp

@@ -1,4 +1,4 @@
-import mm
+import mm.mm as mm
 import asm
 import sched.process as proc
 import drivers.serial.uart.serial as serial
@@ -201,6 +201,10 @@ class Scheduler:
         th.arg = arg
         stack_size: t.CUInt64T = THREAD_STACK_SIZE
         stack_ptr: t.CVoid | t.CPtr = mm.malloc(stack_size)
+        _dbg_ct: t.CArray[t.CChar, 96]
+        viperlib.snprintf(c.Addr(_dbg_ct), 96, "[sched] ct t%d func=0x%lx stack=0x%lx\n",
+                          tid, t.CUInt64T(th.func), t.CUInt64T(stack_ptr))
+        serial.puts(c.Addr(_dbg_ct))
         if not stack_ptr: return None
         th.stack = stack_ptr
         th.stack_size = stack_size
@@ -225,9 +229,9 @@ class Scheduler:
 
 
 _sched_storage:  Scheduler = Scheduler()
-_sched_ptr:      Scheduler | t.CPtr = c.Addr(_sched_storage)
-_switch_old_rsp: t.CVoid | t.CPtr
-_switch_new_rsp: t.CVoid | t.CPtr
+_sched_ptr:      Scheduler | t.CPtr | t.CExport = c.Addr(_sched_storage)
+_switch_old_rsp: t.CVoid | t.CPtr | t.CExport
+_switch_new_rsp: t.CVoid | t.CPtr | t.CExport
 
 @c.Attribute(t.attr.naked)
 def _do_switch():