From ce006bda5a48116c5a6a9b3bf6cd6c3e60f4a5fc Mon Sep 17 00:00:00 2001
From: gdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>
Date: Sun, 11 Jan 2009 10:28:46 +0000
Subject: git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@617
 35acf78f-673a-0410-8e92-d51de3d6d3f4

---
 ports/ARM7/chcore.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ports/ARM7/chcore.h b/ports/ARM7/chcore.h
index a446fdb7e..ed994ac10 100644
--- a/ports/ARM7/chcore.h
+++ b/ports/ARM7/chcore.h
@@ -142,7 +142,11 @@ typedef struct {
  * IRQ prologue code, inserted at the start of all IRQ handlers enabled to
  * invoke system APIs.
  * @note This macro has a different implementation depending if compiled in
- *       ARM or THUMB mode.
+ *       ARM or THUMB mode.
+ * @note The THUMB implementation starts with ARM code because interrupt
+ *       vectors are always invoked in ARM mode regardless the bit 0
+ *       value. The switch in THUMB mode is done in the function prologue so
+ *       it is transparent to the user code.
  */
 #ifdef THUMB
 #define SYS_IRQ_PROLOGUE() {                                            \
-- 
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