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| author | Philippe Gerum <rpm@xenomai.org> | 2009-06-22 16:26:07 (GMT) |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-09-17 01:28:40 (GMT) |
| commit | 9ea7770fdb0d6742d6a0aba62facda4b35356cf2 (patch) | |
| tree | 679027177d58a51f3e4611cfc7ac5d51892db770 /arch/blackfin/mach-common | |
| parent | 7a7967dc1b606f8c88e33bbec773bf82b4a52e6e (diff) | |
| download | linux-9ea7770fdb0d6742d6a0aba62facda4b35356cf2.tar.xz | |
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/blackfin/mach-common')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 25 |
1 files changed, 11 insertions, 14 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index 919f7ae..2c58b60 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; |