mini-os: add stack walking debug

diff -r 63317b6c3eab extras/mini-os/arch/ia64/sched.c
@@ -33,6 +33,11 @@
 
 /* The function is implemented in fw.S */
 extern void thread_starter(void);
+
+void stack_walk(void)
+{
+    /* TODO */
+}
 
 struct thread*
 arch_create_thread(char *name, void (*function)(void *), void *data)

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diff -r 63317b6c3eab extras/mini-os/include/ia64/traps.h
@@ -48,5 +48,7 @@
 
 #include "ia64_cpu.h"
 
+void stack_walk(void);
+
 #endif /* !defined(_TRAPS_H_) */
 

diff -r 63317b6c3eab extras/mini-os/include/x86/traps.h
@@ -69,6 +69,7 @@
 #endif
 
 void dump_regs(struct pt_regs *regs);
+void stack_walk(void);
 
 #define TRAP_PF_PROT   0x1
 #define TRAP_PF_WRITE  0x2

diff -r 63317b6c3eab extras/mini-os/kernel.c
@@ -592,6 +592,7 @@
 void do_exit(void)
 {
     printk("Do_exit called!\n");
+    stack_walk();
     for( ;; )
     {
         struct sched_shutdown sched_shutdown = { .reason = SHUTDOWN_crash };