From 6afea5e58e47b345adaa0f556184f75599503521 Mon Sep 17 00:00:00 2001
From: Brian Cully <bjc@kublai.com>
Date: Mon, 8 Aug 2022 14:48:55 -0400
Subject: log in panics if possible.

---
 src/main.rs | 33 +++++++++++++++++++++------------
 1 file changed, 21 insertions(+), 12 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 7fd2ba3..707feed 100755
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,7 +15,10 @@ use gd32vf103xx_hal::{
     time::Hertz,
     timer::Timer,
 };
-use riscv::asm::wfi;
+use riscv::{
+    asm::wfi,
+    interrupt,
+};
 use riscv_rt::entry;
 
 use led::LED;
@@ -71,28 +74,34 @@ fn main(_hartid: usize) -> ! {
 
 #[export_name="ExceptionHandler"]
 fn exception_handler(_frame: &riscv_rt::TrapFrame) -> ! {
-    loop { unsafe { wfi() } };
+    spin();
 }
 
 #[export_name="DefaultHandler"]
 fn default_handler() -> ! {
-    loop { unsafe { wfi() } };
+    spin();
 }
 
 #[export_name="MachineTimer"]
 fn machine_timer() {
-    loop { unsafe { wfi() } };
+    spin();
 }
 
 #[panic_handler]
 fn panic(info: &core::panic::PanicInfo) -> ! {
-    if let Some(loc) = info.location() {
-        let _file = loc.file();
-        let _line = loc.line();
-        if let Some(_msg) = info.payload().downcast_ref::<&str>() {
-            loop {}
+    interrupt::free(|_cs| {
+        log!("!!! panic ");
+        if let Some(loc) = info.location() {
+            log!("in {}:{} ", loc.file(), loc.line());
         }
-        loop {}
-    }
-    loop {}
+        if let Some(msg) = info.payload().downcast_ref::<&str>() {
+            log!("⇒ {} ", msg);
+        }
+        logln!("!!!");
+    });
+    spin();
+}
+
+fn spin() -> ! {
+    loop { unsafe { wfi() } };
 }
-- 
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