diff options
Diffstat (limited to 'ports')
| -rw-r--r-- | ports/ARM7/chcore.h | 6 |
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() { \
|