2005-04-16 16:20:36 -06:00
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/* $Id: rtrap.S,v 1.61 2002/02/09 19:49:31 davem Exp $
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* rtrap.S: Preparing for return from trap on Sparc V9.
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*
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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*/
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#include <asm/asi.h>
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#include <asm/pstate.h>
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#include <asm/ptrace.h>
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#include <asm/spitfire.h>
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#include <asm/head.h>
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#include <asm/visasm.h>
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#include <asm/processor.h>
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#define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
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#define RTRAP_PSTATE_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV)
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#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
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.text
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.align 32
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__handle_softirq:
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call do_softirq
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nop
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ba,a,pt %xcc, __handle_softirq_continue
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nop
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__handle_preemption:
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call schedule
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wrpr %g0, RTRAP_PSTATE, %pstate
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ba,pt %xcc, __handle_preemption_continue
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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__handle_user_windows:
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call fault_in_user_windows
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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/* Redo sched+sig checks */
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ldx [%g6 + TI_FLAGS], %l0
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andcc %l0, _TIF_NEED_RESCHED, %g0
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be,pt %xcc, 1f
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nop
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call schedule
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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ldx [%g6 + TI_FLAGS], %l0
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2006-01-19 03:42:49 -07:00
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1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
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2005-04-16 16:20:36 -06:00
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be,pt %xcc, __handle_user_windows_continue
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nop
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2006-01-19 03:42:49 -07:00
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mov %l5, %o1
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add %sp, PTREGS_OFF, %o0
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2008-04-24 04:15:22 -06:00
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mov %l0, %o2
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2005-04-16 16:20:36 -06:00
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call do_notify_resume
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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/* Signal delivery can modify pt_regs tstate, so we must
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* reload it.
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*/
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
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sethi %hi(0xf << 20), %l4
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and %l1, %l4, %l4
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ba,pt %xcc, __handle_user_windows_continue
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andn %l1, %l4, %l1
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__handle_perfctrs:
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call update_perfctrs
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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ldub [%g6 + TI_WSAVED], %o2
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brz,pt %o2, 1f
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nop
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/* Redo userwin+sched+sig checks */
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call fault_in_user_windows
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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ldx [%g6 + TI_FLAGS], %l0
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andcc %l0, _TIF_NEED_RESCHED, %g0
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be,pt %xcc, 1f
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nop
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call schedule
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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ldx [%g6 + TI_FLAGS], %l0
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2006-01-19 03:42:49 -07:00
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1: andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
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2005-04-16 16:20:36 -06:00
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be,pt %xcc, __handle_perfctrs_continue
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sethi %hi(TSTATE_PEF), %o0
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2006-01-19 03:42:49 -07:00
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mov %l5, %o1
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add %sp, PTREGS_OFF, %o0
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2008-04-24 04:15:22 -06:00
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mov %l0, %o2
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2005-04-16 16:20:36 -06:00
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call do_notify_resume
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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/* Signal delivery can modify pt_regs tstate, so we must
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* reload it.
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*/
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
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sethi %hi(0xf << 20), %l4
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and %l1, %l4, %l4
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andn %l1, %l4, %l1
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ba,pt %xcc, __handle_perfctrs_continue
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sethi %hi(TSTATE_PEF), %o0
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__handle_userfpu:
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rd %fprs, %l5
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andcc %l5, FPRS_FEF, %g0
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sethi %hi(TSTATE_PEF), %o0
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be,a,pn %icc, __handle_userfpu_continue
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andn %l1, %o0, %l1
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ba,a,pt %xcc, __handle_userfpu_continue
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__handle_signal:
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2006-01-19 03:42:49 -07:00
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mov %l5, %o1
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add %sp, PTREGS_OFF, %o0
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2008-04-24 04:15:22 -06:00
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mov %l0, %o2
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2005-04-16 16:20:36 -06:00
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call do_notify_resume
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wrpr %g0, RTRAP_PSTATE, %pstate
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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/* Signal delivery can modify pt_regs tstate, so we must
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* reload it.
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*/
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
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sethi %hi(0xf << 20), %l4
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and %l1, %l4, %l4
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ba,pt %xcc, __handle_signal_continue
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andn %l1, %l4, %l1
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.align 64
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2008-04-24 04:15:22 -06:00
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.globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
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2005-04-16 16:20:36 -06:00
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rtrap_irq:
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rtrap:
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2005-08-29 23:46:43 -06:00
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#ifndef CONFIG_SMP
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sethi %hi(per_cpu____cpu_data), %l0
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lduw [%l0 + %lo(per_cpu____cpu_data)], %l1
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#else
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sethi %hi(per_cpu____cpu_data), %l0
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or %l0, %lo(per_cpu____cpu_data), %l0
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lduw [%l0 + %g5], %l1
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#endif
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2005-04-16 16:20:36 -06:00
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cmp %l1, 0
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/* mm/ultra.S:xcall_report_regs KNOWS about this load. */
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bne,pn %icc, __handle_softirq
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
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__handle_softirq_continue:
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rtrap_xcall:
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sethi %hi(0xf << 20), %l4
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and %l1, %l4, %l4
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2006-11-16 14:38:57 -07:00
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andn %l1, %l4, %l1
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srl %l4, 20, %l4
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#ifdef CONFIG_TRACE_IRQFLAGS
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brnz,pn %l4, rtrap_no_irq_enable
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nop
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call trace_hardirqs_on
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nop
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wrpr %l4, %pil
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rtrap_no_irq_enable:
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#endif
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andcc %l1, TSTATE_PRIV, %l3
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2005-04-16 16:20:36 -06:00
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bne,pn %icc, to_kernel
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2006-11-16 14:38:57 -07:00
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nop
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2005-04-16 16:20:36 -06:00
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/* We must hold IRQs off and atomically test schedule+signal
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* state, then hold them off all the way back to userspace.
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2006-11-16 14:38:57 -07:00
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* If we are returning to kernel, none of this matters. Note
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* that we are disabling interrupts via PSTATE_IE, not using
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* %pil.
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2005-04-16 16:20:36 -06:00
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*
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* If we do not do this, there is a window where we would do
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* the tests, later the signal/resched event arrives but we do
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* not process it since we are still in kernel mode. It would
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* take until the next local IRQ before the signal/resched
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* event would be handled.
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*
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* This also means that if we have to deal with performance
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* counters or user windows, we have to redo all of these
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* sched+signal checks with IRQs disabled.
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*/
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to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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wrpr 0, %pil
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__handle_preemption_continue:
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ldx [%g6 + TI_FLAGS], %l0
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sethi %hi(_TIF_USER_WORK_MASK), %o0
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or %o0, %lo(_TIF_USER_WORK_MASK), %o0
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andcc %l0, %o0, %g0
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sethi %hi(TSTATE_PEF), %o0
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be,pt %xcc, user_nowork
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andcc %l1, %o0, %g0
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andcc %l0, _TIF_NEED_RESCHED, %g0
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bne,pn %xcc, __handle_preemption
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2006-01-19 03:42:49 -07:00
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andcc %l0, (_TIF_SIGPENDING | _TIF_RESTORE_SIGMASK), %g0
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2005-04-16 16:20:36 -06:00
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bne,pn %xcc, __handle_signal
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__handle_signal_continue:
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ldub [%g6 + TI_WSAVED], %o2
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brnz,pn %o2, __handle_user_windows
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nop
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__handle_user_windows_continue:
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ldx [%g6 + TI_FLAGS], %l5
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andcc %l5, _TIF_PERFCTR, %g0
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sethi %hi(TSTATE_PEF), %o0
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bne,pn %xcc, __handle_perfctrs
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__handle_perfctrs_continue:
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andcc %l1, %o0, %g0
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/* This fpdepth clear is necessary for non-syscall rtraps only */
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user_nowork:
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bne,pn %xcc, __handle_userfpu
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stb %g0, [%g6 + TI_FPDEPTH]
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__handle_userfpu_continue:
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rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
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ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
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ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
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ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
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ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
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2006-02-27 00:24:22 -07:00
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brz,pt %l3, 1f
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2006-02-05 22:59:03 -07:00
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mov %g6, %l2
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2006-02-27 00:24:22 -07:00
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/* Must do this before thread reg is clobbered below. */
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2006-02-02 22:55:10 -07:00
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LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2)
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2006-01-31 19:29:18 -07:00
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1:
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ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
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2005-04-16 16:20:36 -06:00
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ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
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2006-02-05 22:29:28 -07:00
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/* Normal globals are restored, go to trap globals. */
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661: wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
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2006-02-16 17:23:45 -07:00
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nop
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.section .sun4v_2insn_patch, "ax"
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2006-02-05 22:29:28 -07:00
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.word 661b
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2006-02-16 17:23:45 -07:00
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
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2006-02-05 22:29:28 -07:00
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SET_GL(1)
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.previous
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2006-02-05 22:59:03 -07:00
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mov %l2, %g6
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2005-04-16 16:20:36 -06:00
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ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
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ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
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ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
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ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
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ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
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ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
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ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
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ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
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ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
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ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
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ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
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wr %o3, %g0, %y
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wrpr %l4, 0x0, %pil
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wrpr %g0, 0x1, %tl
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wrpr %l1, %g0, %tstate
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wrpr %l2, %g0, %tpc
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wrpr %o2, %g0, %tnpc
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brnz,pn %l3, kern_rtt
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mov PRIMARY_CONTEXT, %l7
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2006-02-07 23:13:05 -07:00
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661: ldxa [%l7 + %l7] ASI_DMMU, %l0
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.section .sun4v_1insn_patch, "ax"
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.word 661b
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ldxa [%l7 + %l7] ASI_MMU, %l0
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.previous
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2005-10-04 16:23:20 -06:00
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sethi %hi(sparc64_kern_pri_nuc_bits), %l1
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ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
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2005-04-16 16:20:36 -06:00
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or %l0, %l1, %l0
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2006-02-07 23:13:05 -07:00
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661: stxa %l0, [%l7] ASI_DMMU
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.section .sun4v_1insn_patch, "ax"
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.word 661b
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stxa %l0, [%l7] ASI_MMU
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.previous
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2006-01-31 19:33:00 -07:00
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sethi %hi(KERNBASE), %l7
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flush %l7
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2005-04-16 16:20:36 -06:00
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rdpr %wstate, %l1
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rdpr %otherwin, %l2
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srl %l1, 3, %l1
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wrpr %l2, %g0, %canrestore
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wrpr %l1, %g0, %wstate
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2006-02-04 01:10:01 -07:00
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brnz,pt %l2, user_rtt_restore
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wrpr %g0, %g0, %otherwin
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ldx [%g6 + TI_FLAGS], %g3
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wr %g0, ASI_AIUP, %asi
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rdpr %cwp, %g1
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andcc %g3, _TIF_32BIT, %g0
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|
sub %g1, 1, %g1
|
|
|
|
bne,pt %xcc, user_rtt_fill_32bit
|
|
|
|
wrpr %g1, %cwp
|
|
|
|
ba,a,pt %xcc, user_rtt_fill_64bit
|
|
|
|
|
|
|
|
user_rtt_fill_fixup:
|
|
|
|
rdpr %cwp, %g1
|
|
|
|
add %g1, 1, %g1
|
|
|
|
wrpr %g1, 0x0, %cwp
|
|
|
|
|
|
|
|
rdpr %wstate, %g2
|
|
|
|
sll %g2, 3, %g2
|
|
|
|
wrpr %g2, 0x0, %wstate
|
|
|
|
|
|
|
|
/* We know %canrestore and %otherwin are both zero. */
|
|
|
|
|
|
|
|
sethi %hi(sparc64_kern_pri_context), %g2
|
|
|
|
ldx [%g2 + %lo(sparc64_kern_pri_context)], %g2
|
|
|
|
mov PRIMARY_CONTEXT, %g1
|
2006-02-07 23:13:05 -07:00
|
|
|
|
|
|
|
661: stxa %g2, [%g1] ASI_DMMU
|
|
|
|
.section .sun4v_1insn_patch, "ax"
|
|
|
|
.word 661b
|
|
|
|
stxa %g2, [%g1] ASI_MMU
|
|
|
|
.previous
|
|
|
|
|
2006-02-04 01:10:01 -07:00
|
|
|
sethi %hi(KERNBASE), %g1
|
|
|
|
flush %g1
|
|
|
|
|
|
|
|
or %g4, FAULT_CODE_WINFIXUP, %g4
|
|
|
|
stb %g4, [%g6 + TI_FAULT_CODE]
|
|
|
|
stx %g5, [%g6 + TI_FAULT_ADDR]
|
|
|
|
|
|
|
|
mov %g6, %l1
|
|
|
|
wrpr %g0, 0x0, %tl
|
2006-02-05 22:29:28 -07:00
|
|
|
|
|
|
|
661: nop
|
2006-02-07 01:00:16 -07:00
|
|
|
.section .sun4v_1insn_patch, "ax"
|
2006-02-05 22:29:28 -07:00
|
|
|
.word 661b
|
|
|
|
SET_GL(0)
|
|
|
|
.previous
|
|
|
|
|
2006-02-22 17:15:45 -07:00
|
|
|
wrpr %g0, RTRAP_PSTATE, %pstate
|
|
|
|
|
2006-02-04 01:10:01 -07:00
|
|
|
mov %l1, %g6
|
|
|
|
ldx [%g6 + TI_TASK], %g4
|
|
|
|
LOAD_PER_CPU_BASE(%g5, %g6, %g1, %g2, %g3)
|
|
|
|
call do_sparc64_fault
|
|
|
|
add %sp, PTREGS_OFF, %o0
|
|
|
|
ba,pt %xcc, rtrap
|
|
|
|
nop
|
|
|
|
|
|
|
|
user_rtt_pre_restore:
|
|
|
|
add %g1, 1, %g1
|
|
|
|
wrpr %g1, 0x0, %cwp
|
|
|
|
|
|
|
|
user_rtt_restore:
|
2005-04-16 16:20:36 -06:00
|
|
|
restore
|
|
|
|
rdpr %canrestore, %g1
|
|
|
|
wrpr %g1, 0x0, %cleanwin
|
|
|
|
retry
|
|
|
|
nop
|
|
|
|
|
2006-02-04 01:10:01 -07:00
|
|
|
kern_rtt: rdpr %canrestore, %g1
|
|
|
|
brz,pn %g1, kern_rtt_fill
|
|
|
|
nop
|
|
|
|
kern_rtt_restore:
|
|
|
|
restore
|
2005-04-16 16:20:36 -06:00
|
|
|
retry
|
2006-02-04 01:10:01 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
to_kernel:
|
|
|
|
#ifdef CONFIG_PREEMPT
|
|
|
|
ldsw [%g6 + TI_PRE_COUNT], %l5
|
|
|
|
brnz %l5, kern_fpucheck
|
|
|
|
ldx [%g6 + TI_FLAGS], %l5
|
|
|
|
andcc %l5, _TIF_NEED_RESCHED, %g0
|
|
|
|
be,pt %xcc, kern_fpucheck
|
2006-11-16 14:38:57 -07:00
|
|
|
nop
|
|
|
|
cmp %l4, 0
|
2005-04-16 16:20:36 -06:00
|
|
|
bne,pn %xcc, kern_fpucheck
|
|
|
|
sethi %hi(PREEMPT_ACTIVE), %l6
|
|
|
|
stw %l6, [%g6 + TI_PRE_COUNT]
|
|
|
|
call schedule
|
|
|
|
nop
|
|
|
|
ba,pt %xcc, rtrap
|
|
|
|
stw %g0, [%g6 + TI_PRE_COUNT]
|
|
|
|
#endif
|
|
|
|
kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5
|
|
|
|
brz,pt %l5, rt_continue
|
|
|
|
srl %l5, 1, %o0
|
|
|
|
add %g6, TI_FPSAVED, %l6
|
|
|
|
ldub [%l6 + %o0], %l2
|
|
|
|
sub %l5, 2, %l5
|
|
|
|
|
|
|
|
add %g6, TI_GSR, %o1
|
|
|
|
andcc %l2, (FPRS_FEF|FPRS_DU), %g0
|
|
|
|
be,pt %icc, 2f
|
|
|
|
and %l2, FPRS_DL, %l6
|
|
|
|
andcc %l2, FPRS_FEF, %g0
|
|
|
|
be,pn %icc, 5f
|
|
|
|
sll %o0, 3, %o5
|
|
|
|
rd %fprs, %g1
|
|
|
|
|
|
|
|
wr %g1, FPRS_FEF, %fprs
|
|
|
|
ldx [%o1 + %o5], %g1
|
|
|
|
add %g6, TI_XFSR, %o1
|
|
|
|
sll %o0, 8, %o2
|
|
|
|
add %g6, TI_FPREGS, %o3
|
|
|
|
brz,pn %l6, 1f
|
|
|
|
add %g6, TI_FPREGS+0x40, %o4
|
|
|
|
|
2005-10-07 14:30:49 -06:00
|
|
|
membar #Sync
|
2005-04-16 16:20:36 -06:00
|
|
|
ldda [%o3 + %o2] ASI_BLK_P, %f0
|
|
|
|
ldda [%o4 + %o2] ASI_BLK_P, %f16
|
2005-10-07 14:30:49 -06:00
|
|
|
membar #Sync
|
2005-04-16 16:20:36 -06:00
|
|
|
1: andcc %l2, FPRS_DU, %g0
|
|
|
|
be,pn %icc, 1f
|
|
|
|
wr %g1, 0, %gsr
|
|
|
|
add %o2, 0x80, %o2
|
2005-10-07 14:30:49 -06:00
|
|
|
membar #Sync
|
2005-04-16 16:20:36 -06:00
|
|
|
ldda [%o3 + %o2] ASI_BLK_P, %f32
|
|
|
|
ldda [%o4 + %o2] ASI_BLK_P, %f48
|
|
|
|
1: membar #Sync
|
|
|
|
ldx [%o1 + %o5], %fsr
|
|
|
|
2: stb %l5, [%g6 + TI_FPDEPTH]
|
|
|
|
ba,pt %xcc, rt_continue
|
|
|
|
nop
|
|
|
|
5: wr %g0, FPRS_FEF, %fprs
|
|
|
|
sll %o0, 8, %o2
|
|
|
|
|
|
|
|
add %g6, TI_FPREGS+0x80, %o3
|
|
|
|
add %g6, TI_FPREGS+0xc0, %o4
|
2005-10-07 14:30:49 -06:00
|
|
|
membar #Sync
|
2005-04-16 16:20:36 -06:00
|
|
|
ldda [%o3 + %o2] ASI_BLK_P, %f32
|
|
|
|
ldda [%o4 + %o2] ASI_BLK_P, %f48
|
|
|
|
membar #Sync
|
|
|
|
wr %g0, FPRS_DU, %fprs
|
|
|
|
ba,pt %xcc, rt_continue
|
|
|
|
stb %l5, [%g6 + TI_FPDEPTH]
|