debug: add ENTER/EXIT markers in usermode_bootstrap

src/syscall/process.rs

@@ -148,7 +148,9 @@ const KERNEL_METADATA_PAGE_COUNT: usize = syscall::KERNEL_METADATA_SIZE / PAGE_S
 };
 
 pub unsafe fn usermode_bootstrap(bootstrap: &Bootstrap, token: &mut CleanLockToken) {
+    info!("usermode_bootstrap: ENTER, page_count={}", bootstrap.page_count);
     assert_ne!(bootstrap.page_count, 0);
+    info!("usermode_bootstrap: page_count ok, mapping pages");
 
     {
         let addr_space = Arc::clone(
@@ -358,6 +360,7 @@ pub unsafe fn usermode_bootstrap(bootstrap: &Bootstrap, token: &mut CleanLockTok
         regs.set_instr_pointer(bootstrap_entry.try_into().unwrap());
         regs.set_stack_pointer(stack_top_vaddr);
     }
+    info!("usermode_bootstrap: EXIT, entry={:#x}, sp={:#x}", bootstrap_entry, stack_top_vaddr);
 }
 
 unsafe fn bootstrap_mem(bootstrap: &crate::startup::Bootstrap) -> &'static [u8] {