fix: prevent direct cast of function item into an integer

Author: Ivans-11

ch4/src/main.rs

@@ -123,7 +123,7 @@ extern "C" fn rust_main() -> ! {
         build_flags("_WRV"),
     );
     // 建立调度线程，目的是划分异常域。调度线程上发生内核异常时会回到这个控制流处理
-    let mut scheduling = LocalContext::thread(schedule as _, false);
+    let mut scheduling = LocalContext::thread(schedule as *const () as _, false);
     *scheduling.sp_mut() = 1 << 38;
     unsafe { scheduling.execute() };
     log::error!("stval = {:#x}", stval::read());

user/src/bin/sig_ctrlc.rs

@@ -20,7 +20,7 @@ pub extern "C" fn main() -> i32 {
 
     let mut new = SignalAction::default();
     let old = SignalAction::default();
-    new.handler = func as usize;
+    new.handler = func as *const () as usize;
 
     println!("sig_ctrlc: sigaction");
     if sigaction(SignalNo::SIGINT, &new, &old) < 0 {

user/src/bin/sig_simple.rs

@@ -14,7 +14,7 @@ fn func() {
 pub extern "C" fn main() -> i32 {
     let mut new = SignalAction::default();
     let old = SignalAction::default();
-    new.handler = func as usize;
+    new.handler = func as *const () as usize;
     println!("pid = {}", getpid());
     println!("signal_simple: sigaction");
     if sigaction(SignalNo::SIGUSR1, &new, &old) < 0 {

user/src/bin/sig_simple2.rs

@@ -16,7 +16,7 @@ pub extern "C" fn main() -> i32 {
     if pid == 0 {
         let mut new = SignalAction::default();
         let old = SignalAction::default();
-        new.handler = func as usize;
+        new.handler = func as *const () as usize;
 
         println!("signal_simple2: child sigaction");
         if sigaction(SignalNo::SIGUSR1, &new, &old) < 0 {

user/src/bin/sig_tests.rs

@@ -49,7 +49,7 @@ fn user_sig_test_multiprocsignals() {
     if pid == 0 {
         let mut new = SignalAction::default();
         let old = SignalAction::default();
-        new.handler = func as usize;
+        new.handler = func as *const () as usize;
         if sigaction(SignalNo::SIGUSR1, &new, &old) < 0 {
             panic!("Sigaction failed!");
         }
@@ -67,7 +67,7 @@ fn user_sig_test_restore() {
     let mut new = SignalAction::default();
     let old = SignalAction::default();
     let old2 = SignalAction::default();
-    new.handler = func as usize;
+    new.handler = func as *const () as usize;
 
     if sigaction(SignalNo::SIGUSR1, &new, &old) < 0 {
         panic!("Sigaction failed!");
@@ -108,7 +108,7 @@ fn kernel_sig_test_stop_cont() {
 fn kernel_sig_test_failignorekill() {
     let mut new = SignalAction::default();
     let old = SignalAction::default();
-    new.handler = func as usize;
+    new.handler = func as *const () as usize;
 
     if sigaction(SignalNo::SIGKILL, &new, &old) >= 0 {
         panic!("Should not set sigaction to kill!");
@@ -126,11 +126,11 @@ fn kernel_sig_test_failignorekill() {
 fn final_sig_test() {
     let mut new = SignalAction::default();
     let old = SignalAction::default();
-    new.handler = func2 as usize;
+    new.handler = func2 as *const () as usize;
 
     let mut new2 = SignalAction::default();
     let old2 = SignalAction::default();
-    new2.handler = func3 as usize;
+    new2.handler = func3 as *const () as usize;
 
     let pid = fork();
     if pid == 0 {