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Blackfin: sanitize manual control of IPEND[4]

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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>
This commit is contained in:
Philippe Gerum 2009-06-22 18:26:07 +02:00 committed by Mike Frysinger
parent 7a7967dc1b
commit 9ea7770fdb
1 changed files with 11 additions and 14 deletions
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25
arch/blackfin/mach-common/entry.S
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@ -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;