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authorChris Metcalf <cmetcalf@tilera.com>2011-05-02 14:50:06 -0400
committerChris Metcalf <cmetcalf@tilera.com>2011-05-02 18:53:35 -0400
commit313ce674d3cbc2d48ed34a9462427920ac54f4ad (patch)
tree7478150a1268c79851f1a366158c59606330e700 /arch/tile/kernel/intvec_32.S
parent93013a0f533fb3dd6875ca670d8e0bb4166a796e (diff)
downloadlinux-stericsson-313ce674d3cbc2d48ed34a9462427920ac54f4ad.tar.gz
arch/tile: support TIF_NOTIFY_RESUME
This support is required for CONFIG_KEYS, NFSv4 kernel DNS, etc. The change is slightly more complex than the minimal thing, since I took advantage of having to go into the assembly code to just move a bunch of stuff into C code: specifically, the schedule(), do_async_page_fault(), do_signal(), and single_step_once() support, in addition to the TIF_NOTIFY_RESUME support. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel/intvec_32.S')
-rw-r--r--arch/tile/kernel/intvec_32.S114
1 files changed, 17 insertions, 97 deletions
diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S
index fffcfa6b3a62..f35c3124fa62 100644
--- a/arch/tile/kernel/intvec_32.S
+++ b/arch/tile/kernel/intvec_32.S
@@ -851,14 +851,27 @@ STD_ENTRY(interrupt_return)
/* Check to see if there is any work to do before returning to user. */
{
addi r29, r32, THREAD_INFO_FLAGS_OFFSET
- moveli r28, lo16(_TIF_ALLWORK_MASK)
+ moveli r1, lo16(_TIF_ALLWORK_MASK)
}
{
lw r29, r29
- auli r28, r28, ha16(_TIF_ALLWORK_MASK)
+ auli r1, r1, ha16(_TIF_ALLWORK_MASK)
}
- and r28, r29, r28
- bnz r28, .Lwork_pending
+ and r1, r29, r1
+ bzt r1, .Lrestore_all
+
+ /*
+ * Make sure we have all the registers saved for signal
+ * handling or single-step. Call out to C code to figure out
+ * exactly what we need to do for each flag bit, then if
+ * necessary, reload the flags and recheck.
+ */
+ push_extra_callee_saves r0
+ {
+ PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
+ jal do_work_pending
+ }
+ bnz r0, .Lresume_userspace
/*
* In the NMI case we
@@ -1099,99 +1112,6 @@ STD_ENTRY(interrupt_return)
pop_reg r50
pop_reg r51, sp, PTREGS_OFFSET_REG(29) - PTREGS_OFFSET_REG(51)
j .Lcontinue_restore_regs
-
-.Lwork_pending:
- /* Mask the reschedule flag */
- andi r28, r29, _TIF_NEED_RESCHED
-
- {
- /*
- * If the NEED_RESCHED flag is called, we call schedule(), which
- * may drop this context right here and go do something else.
- * On return, jump back to .Lresume_userspace and recheck.
- */
- bz r28, .Lasync_tlb
-
- /* Mask the async-tlb flag */
- andi r28, r29, _TIF_ASYNC_TLB
- }
-
- jal schedule
- FEEDBACK_REENTER(interrupt_return)
-
- /* Reload the flags and check again */
- j .Lresume_userspace
-
-.Lasync_tlb:
- {
- bz r28, .Lneed_sigpending
-
- /* Mask the sigpending flag */
- andi r28, r29, _TIF_SIGPENDING
- }
-
- PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
- jal do_async_page_fault
- FEEDBACK_REENTER(interrupt_return)
-
- /*
- * Go restart the "resume userspace" process. We may have
- * fired a signal, and we need to disable interrupts again.
- */
- j .Lresume_userspace
-
-.Lneed_sigpending:
- /*
- * At this point we are either doing signal handling or single-step,
- * so either way make sure we have all the registers saved.
- */
- push_extra_callee_saves r0
-
- {
- /* If no signal pending, skip to singlestep check */
- bz r28, .Lneed_singlestep
-
- /* Mask the singlestep flag */
- andi r28, r29, _TIF_SINGLESTEP
- }
-
- jal do_signal
- FEEDBACK_REENTER(interrupt_return)
-
- /* Reload the flags and check again */
- j .Lresume_userspace
-
-.Lneed_singlestep:
- {
- /* Get a pointer to the EX1 field */
- PTREGS_PTR(r29, PTREGS_OFFSET_EX1)
-
- /* If we get here, our bit must be set. */
- bz r28, .Lwork_confusion
- }
- /* If we are in priv mode, don't single step */
- lw r28, r29
- andi r28, r28, SPR_EX_CONTEXT_1_1__PL_MASK /* mask off ICS */
- bnz r28, .Lrestore_all
-
- /* Allow interrupts within the single step code */
- TRACE_IRQS_ON /* Note: clobbers registers r0-r29 */
- IRQ_ENABLE(r20, r21)
-
- /* try to single-step the current instruction */
- PTREGS_PTR(r0, PTREGS_OFFSET_BASE)
- jal single_step_once
- FEEDBACK_REENTER(interrupt_return)
-
- /* Re-disable interrupts. TRACE_IRQS_OFF in .Lrestore_all. */
- IRQ_DISABLE(r20,r21)
-
- j .Lrestore_all
-
-.Lwork_confusion:
- move r0, r28
- panic "thread_info allwork flags unhandled on userspace resume: %#x"
-
STD_ENDPROC(interrupt_return)
/*