From a6386f74b821e34e86f1853b539b3140db7ad406 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Tue, 31 Jan 2017 13:58:34 +1100
Subject: [PATCH] stmhal/pendsv: Fill in comments about what the stack
 contains.

---
 stmhal/pendsv.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/stmhal/pendsv.c b/stmhal/pendsv.c
index ff4480eed3..61fe954390 100644
--- a/stmhal/pendsv.c
+++ b/stmhal/pendsv.c
@@ -70,21 +70,21 @@ void pendsv_isr_handler(void) {
     // on entry to this (naked) function, stack has the following layout:
     //
     // stack layout with DEBUG disabled:
-    //   sp[6]: pc
-    //   sp[5]: ?
-    //   sp[4]: ?
-    //   sp[3]: ?
-    //   sp[2]: ?
-    //   sp[1]: ?
+    //   sp[6]: pc=r15
+    //   sp[5]: lr=r14
+    //   sp[4]: r12
+    //   sp[3]: r3
+    //   sp[2]: r2
+    //   sp[1]: r1
     //   sp[0]: r0
     //
     // stack layout with DEBUG enabled:
-    //   sp[8]: pc
-    //   sp[7]: lr
-    //   sp[6]: ?
-    //   sp[5]: ?
-    //   sp[4]: ?
-    //   sp[3]: ?
+    //   sp[8]: pc=r15
+    //   sp[7]: lr=r14
+    //   sp[6]: r12
+    //   sp[5]: r3
+    //   sp[4]: r2
+    //   sp[3]: r1
     //   sp[2]: r0
     //   sp[1]: 0xfffffff9
     //   sp[0]: ?