mirror of
git://projects.qi-hardware.com/wernermisc.git
synced 2024-12-21 07:49:53 +02:00
49 lines
1.7 KiB
Diff
49 lines
1.7 KiB
Diff
This patch is under review:
|
|
https://www.rtems.org/bugzilla/show_bug.cgi?id=1956
|
|
|
|
The comments in cpukit/score/cpu/lm32/rtems/score/cpu.h state that
|
|
CPU_STACK_ALIGNMENT should either be 0 or >= CPU_ALIGNMENT. The
|
|
latter was 8, the former is 4.
|
|
|
|
Further investigation revealed that, contrary to what the comment
|
|
says, 0 is not a valid value for CPU_STACK_ALIGNMENT.
|
|
|
|
This patch sets CPU_ALIGNMENT to 4, since we don't have any machine
|
|
word larger than that. (doubles and long longs are handled by
|
|
software and either extremely slow already or rare.)
|
|
|
|
The patch also corrects the misleading comment before
|
|
CPU_STACK_ALIGNMENT.
|
|
|
|
I'm not sure if this fix has any real-life impact on M1 behaviour,
|
|
but I guess it can't hurt.
|
|
|
|
- Werner
|
|
|
|
Index: rtems/cpukit/score/cpu/lm32/rtems/score/cpu.h
|
|
===================================================================
|
|
--- rtems.orig/cpukit/score/cpu/lm32/rtems/score/cpu.h 2011-11-12 03:01:35.000000000 -0300
|
|
+++ rtems/cpukit/score/cpu/lm32/rtems/score/cpu.h 2011-11-12 03:03:46.000000000 -0300
|
|
@@ -637,7 +637,7 @@
|
|
*
|
|
* XXX document implementation including references if appropriate
|
|
*/
|
|
-#define CPU_ALIGNMENT 8
|
|
+#define CPU_ALIGNMENT 4
|
|
|
|
/**
|
|
* This number corresponds to the byte alignment requirement for the
|
|
@@ -687,9 +687,10 @@
|
|
* stack. This alignment requirement may be stricter than that for the
|
|
* data types alignment specified by @ref CPU_ALIGNMENT. If the
|
|
* @ref CPU_ALIGNMENT is strict enough for the stack, then this should be
|
|
- * set to 0.
|
|
+ * set to @ref CPU_ALIGNMENT.
|
|
*
|
|
- * @note This must be a power of 2 either 0 or greater than @ref CPU_ALIGNMENT.
|
|
+ * @note This must be a power of 2 either equal to or greater than
|
|
+ * @ref CPU_ALIGNMENT.
|
|
*
|
|
* Port Specific Information:
|
|
*
|