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authorPhilippe Gerum <rpm@xenomai.org>2009-06-22 18:26:07 +0200
committerMike Frysinger <vapier@gentoo.org>2009-09-16 21:28:40 -0400
commit9ea7770fdb0d6742d6a0aba62facda4b35356cf2 (patch)
tree679027177d58a51f3e4611cfc7ac5d51892db770 /arch
parent7a7967dc1b606f8c88e33bbec773bf82b4a52e6e (diff)
Blackfin: sanitize manual control of IPEND[4]
Cleanup is performed in two ways: - remove extraneous updates of IPEND[4] w/ CONFIG_IPIPE, and document remaining use. - substitute pop-reg-from-stack instructions with plain SP fixups in all save-RETI-then-discard patterns. Signed-off-by: Philippe Gerum <rpm@xenomai.org> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/blackfin/mach-common/entry.S25
1 files changed, 11 insertions, 14 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 919f7aef077..2c58b60ff13 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -708,8 +708,14 @@ ENTRY(_system_call)
#ifdef CONFIG_IPIPE
cc = BITTST(r7, TIF_IRQ_SYNC);
if !cc jump .Lsyscall_no_irqsync;
+ /*
+ * Clear IPEND[4] manually to undo what resume_userspace_1 just did;
+ * we need this so that high priority domain interrupts may still
+ * preempt the current domain while the pipeline log is being played
+ * back.
+ */
[--sp] = reti;
- r0 = [sp++];
+ SP += 4; /* don't merge with next insn to keep the pattern obvious */
SP += -12;
call ___ipipe_sync_root;
SP += 12;
@@ -721,7 +727,7 @@ ENTRY(_system_call)
/* Reenable interrupts. */
[--sp] = reti;
- r0 = [sp++];
+ sp += 4;
SP += -12;
call _schedule;
@@ -737,7 +743,7 @@ ENTRY(_system_call)
.Lsyscall_do_signals:
/* Reenable interrupts. */
[--sp] = reti;
- r0 = [sp++];
+ sp += 4;
r0 = sp;
SP += -12;
@@ -747,10 +753,6 @@ ENTRY(_system_call)
.Lsyscall_really_exit:
r5 = [sp + PT_RESERVED];
rets = r5;
-#ifdef CONFIG_IPIPE
- [--sp] = reti;
- r5 = [sp++];
-#endif /* CONFIG_IPIPE */
rts;
ENDPROC(_system_call)
@@ -904,14 +906,9 @@ ENDPROC(_ret_from_exception)
#ifdef CONFIG_IPIPE
-_sync_root_irqs:
- [--sp] = reti; /* Reenable interrupts */
- r0 = [sp++];
- jump.l ___ipipe_sync_root
-
_resume_kernel_from_int:
- r0.l = _sync_root_irqs
- r0.h = _sync_root_irqs
+ r0.l = ___ipipe_sync_root;
+ r0.h = ___ipipe_sync_root;
[--sp] = rets;
[--sp] = ( r7:4, p5:3 );
SP += -12;