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authorgdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>2009-01-11 10:28:46 +0000
committergdisirio <gdisirio@35acf78f-673a-0410-8e92-d51de3d6d3f4>2009-01-11 10:28:46 +0000
commitce006bda5a48116c5a6a9b3bf6cd6c3e60f4a5fc (patch)
treee07f3f3ee70e4f45ca5f9a85a9559932ecd4a72a /ports
parent122015057a398b5132960577ac7ba4e7c1cb5b88 (diff)
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git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@617 35acf78f-673a-0410-8e92-d51de3d6d3f4
Diffstat (limited to 'ports')
-rw-r--r--ports/ARM7/chcore.h6
1 files changed, 5 insertions, 1 deletions
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() { \