-/* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $
+/*
* rtrap.S: Preparing for return from trap on Sparc V9.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
- /* Register %l6 keeps track of whether we are returning
- * from a system call or not. It is cleared if we call
- * do_notify_resume, and it must not be otherwise modified
- * until we fully commit to returning to userspace.
- */
-
.text
.align 32
__handle_softirq:
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
-1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+1: andcc %l0, _TIF_SIGPENDING, %g0
be,pt %xcc, __handle_user_windows_continue
nop
mov %l5, %o1
- mov %l6, %o2
add %sp, PTREGS_OFF, %o0
- mov %l0, %o3
+ mov %l0, %o2
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
ldx [%g6 + TI_FLAGS], %l0
-1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+1: andcc %l0, _TIF_SIGPENDING, %g0
be,pt %xcc, __handle_perfctrs_continue
sethi %hi(TSTATE_PEF), %o0
mov %l5, %o1
- mov %l6, %o2
add %sp, PTREGS_OFF, %o0
- mov %l0, %o3
+ mov %l0, %o2
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
*/
__handle_signal:
mov %l5, %o1
- mov %l6, %o2
add %sp, PTREGS_OFF, %o0
- mov %l0, %o3
+ mov %l0, %o2
call do_notify_resume
wrpr %g0, RTRAP_PSTATE, %pstate
wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- clr %l6
/* Signal delivery can modify pt_regs tstate, so we must
* reload it.
andn %l1, %l4, %l1
.align 64
- .globl rtrap_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall
+ .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
rtrap_irq:
-rtrap_clr_l6: clr %l6
rtrap:
#ifndef CONFIG_SMP
sethi %hi(per_cpu____cpu_data), %l0
__handle_softirq_continue:
rtrap_xcall:
sethi %hi(0xf << 20), %l4
- andcc %l1, TSTATE_PRIV, %l3
and %l1, %l4, %l4
+ andn %l1, %l4, %l1
+ srl %l4, 20, %l4
+#ifdef CONFIG_TRACE_IRQFLAGS
+ brnz,pn %l4, rtrap_no_irq_enable
+ nop
+ call trace_hardirqs_on
+ nop
+ wrpr %l4, %pil
+rtrap_no_irq_enable:
+#endif
+ andcc %l1, TSTATE_PRIV, %l3
bne,pn %icc, to_kernel
- andn %l1, %l4, %l1
+ nop
/* We must hold IRQs off and atomically test schedule+signal
* state, then hold them off all the way back to userspace.
- * If we are returning to kernel, none of this matters.
+ * If we are returning to kernel, none of this matters. Note
+ * that we are disabling interrupts via PSTATE_IE, not using
+ * %pil.
*
* If we do not do this, there is a window where we would do
* the tests, later the signal/resched event arrives but we do
andcc %l1, %o0, %g0
andcc %l0, _TIF_NEED_RESCHED, %g0
bne,pn %xcc, __handle_preemption
- andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
+ andcc %l0, _TIF_SIGPENDING, %g0
bne,pn %xcc, __handle_signal
__handle_signal_continue:
ldub [%g6 + TI_WSAVED], %o2
ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
wr %o3, %g0, %y
- srl %l4, 20, %l4
wrpr %l4, 0x0, %pil
wrpr %g0, 0x1, %tl
+ andn %l1, TSTATE_SYSCALL, %l1
wrpr %l1, %g0, %tstate
wrpr %l2, %g0, %tpc
wrpr %o2, %g0, %tnpc
ldx [%g6 + TI_FLAGS], %l5
andcc %l5, _TIF_NEED_RESCHED, %g0
be,pt %xcc, kern_fpucheck
- srl %l4, 20, %l5
- cmp %l5, 0
+ nop
+ cmp %l4, 0
bne,pn %xcc, kern_fpucheck
sethi %hi(PREEMPT_ACTIVE), %l6
stw %l6, [%g6 + TI_PRE_COUNT]