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2011-04-04 Joel Sherrill <joel.sherrilL@OARcorp.com>

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PR 1768/bsps
	* shared/irq/irq_asm.S: The nbench benchmark highlighted the fact that
	we do not perform a cld before calling C code in the ISR. This was
	historically not a problem but gcc 4.3 changed the behavior. From
	http://gcc.gnu.org/gcc-4.3/changes.html
This commit is contained in:
Joel Sherrill
2011-04-04 16:44:55 +00:00
parent 619f97eae2
commit c13ddac0b2
2 changed files with 15 additions and 0 deletions
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8
c/src/lib/libbsp/i386/ChangeLog
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@@ -1,3 +1,11 @@
2011-04-04 Joel Sherrill <joel.sherrilL@OARcorp.com>
PR 1768/bsps
* shared/irq/irq_asm.S: The nbench benchmark highlighted the fact that
we do not perform a cld before calling C code in the ISR. This was
historically not a problem but gcc 4.3 changed the behavior. From
http://gcc.gnu.org/gcc-4.3/changes.html
2011-02-02 Ralf Corsépius <ralf.corsepius@rtems.org>
* configure.ac: Require autoconf-2.68, automake-1.11.1.

7
c/src/lib/libbsp/i386/shared/irq/irq_asm.S
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@@ -145,6 +145,13 @@ nested:
incl SYM (_ISR_Nest_level) /* one nest level deeper */
incl SYM (_Thread_Dispatch_disable_level) /* disable multitasking */
/*
* GCC versions starting with 4.3 no longer place the cld
* instruction before string operations. We need to ensure
* it is set correctly for ISR handlers.
*/
cld
/*
* re-enable interrupts at processor level as the current
* interrupt source is now masked via i8259