+++ /dev/null
-/*
- * rtrap.S: Preparing for return from trap on Sparc V9.
- *
- * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
- */
-
-
-#include <asm/asi.h>
-#include <asm/pstate.h>
-#include <asm/ptrace.h>
-#include <asm/spitfire.h>
-#include <asm/head.h>
-#include <asm/visasm.h>
-#include <asm/processor.h>
-
-#define RTRAP_PSTATE (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
-#define RTRAP_PSTATE_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV)
-#define RTRAP_PSTATE_AG_IRQOFF (PSTATE_TSO|PSTATE_PEF|PSTATE_PRIV|PSTATE_AG)
-
- .text
- .align 32
-__handle_softirq:
- call do_softirq
- nop
- ba,a,pt %xcc, __handle_softirq_continue
- nop
-__handle_preemption:
- call schedule
- wrpr %g0, RTRAP_PSTATE, %pstate
- ba,pt %xcc, __handle_preemption_continue
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
-
-__handle_user_windows:
- call fault_in_user_windows
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- /* Redo sched+sig checks */
- ldx [%g6 + TI_FLAGS], %l0
- andcc %l0, _TIF_NEED_RESCHED, %g0
-
- be,pt %xcc, 1f
- nop
- call schedule
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- ldx [%g6 + TI_FLAGS], %l0
-
-1: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
- be,pt %xcc, __handle_user_windows_continue
- nop
- mov %l5, %o1
- add %sp, PTREGS_OFF, %o0
- mov %l0, %o2
-
- call do_notify_resume
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- /* Signal delivery can modify pt_regs tstate, so we must
- * reload it.
- */
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
- sethi %hi(0xf << 20), %l4
- and %l1, %l4, %l4
- ba,pt %xcc, __handle_user_windows_continue
-
- andn %l1, %l4, %l1
-__handle_perfctrs:
- call update_perfctrs
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- ldub [%g6 + TI_WSAVED], %o2
- brz,pt %o2, 1f
- nop
- /* Redo userwin+sched+sig checks */
- call fault_in_user_windows
-
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- ldx [%g6 + TI_FLAGS], %l0
- andcc %l0, _TIF_NEED_RESCHED, %g0
- be,pt %xcc, 1f
-
- nop
- call schedule
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- ldx [%g6 + TI_FLAGS], %l0
-1: andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
-
- be,pt %xcc, __handle_perfctrs_continue
- sethi %hi(TSTATE_PEF), %o0
- mov %l5, %o1
- add %sp, PTREGS_OFF, %o0
- mov %l0, %o2
- call do_notify_resume
-
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- /* Signal delivery can modify pt_regs tstate, so we must
- * reload it.
- */
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
- sethi %hi(0xf << 20), %l4
- and %l1, %l4, %l4
- andn %l1, %l4, %l1
- ba,pt %xcc, __handle_perfctrs_continue
-
- sethi %hi(TSTATE_PEF), %o0
-__handle_userfpu:
- rd %fprs, %l5
- andcc %l5, FPRS_FEF, %g0
- sethi %hi(TSTATE_PEF), %o0
- be,a,pn %icc, __handle_userfpu_continue
- andn %l1, %o0, %l1
- ba,a,pt %xcc, __handle_userfpu_continue
-
-__handle_signal:
- mov %l5, %o1
- add %sp, PTREGS_OFF, %o0
- mov %l0, %o2
- call do_notify_resume
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
-
- /* Signal delivery can modify pt_regs tstate, so we must
- * reload it.
- */
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
- sethi %hi(0xf << 20), %l4
- and %l1, %l4, %l4
- ba,pt %xcc, __handle_signal_continue
- andn %l1, %l4, %l1
-
- /* When returning from a NMI (%pil==15) interrupt we want to
- * avoid running softirqs, doing IRQ tracing, preempting, etc.
- */
- .globl rtrap_nmi
-rtrap_nmi: ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
- sethi %hi(0xf << 20), %l4
- and %l1, %l4, %l4
- andn %l1, %l4, %l1
- srl %l4, 20, %l4
- ba,pt %xcc, rtrap_no_irq_enable
- wrpr %l4, %pil
-
- .align 64
- .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
-rtrap_irq:
-rtrap:
-#ifndef CONFIG_SMP
- sethi %hi(per_cpu____cpu_data), %l0
- lduw [%l0 + %lo(per_cpu____cpu_data)], %l1
-#else
- sethi %hi(per_cpu____cpu_data), %l0
- or %l0, %lo(per_cpu____cpu_data), %l0
- lduw [%l0 + %g5], %l1
-#endif
- cmp %l1, 0
-
- /* mm/ultra.S:xcall_report_regs KNOWS about this load. */
- bne,pn %icc, __handle_softirq
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
-__handle_softirq_continue:
-rtrap_xcall:
- sethi %hi(0xf << 20), %l4
- 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
-#endif
-rtrap_no_irq_enable:
- andcc %l1, TSTATE_PRIV, %l3
- bne,pn %icc, to_kernel
- 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. 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
- * not process it since we are still in kernel mode. It would
- * take until the next local IRQ before the signal/resched
- * event would be handled.
- *
- * This also means that if we have to deal with performance
- * counters or user windows, we have to redo all of these
- * sched+signal checks with IRQs disabled.
- */
-to_user: wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- wrpr 0, %pil
-__handle_preemption_continue:
- ldx [%g6 + TI_FLAGS], %l0
- sethi %hi(_TIF_USER_WORK_MASK), %o0
- or %o0, %lo(_TIF_USER_WORK_MASK), %o0
- andcc %l0, %o0, %g0
- sethi %hi(TSTATE_PEF), %o0
- be,pt %xcc, user_nowork
- andcc %l1, %o0, %g0
- andcc %l0, _TIF_NEED_RESCHED, %g0
- bne,pn %xcc, __handle_preemption
- andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0
- bne,pn %xcc, __handle_signal
-__handle_signal_continue:
- ldub [%g6 + TI_WSAVED], %o2
- brnz,pn %o2, __handle_user_windows
- nop
-__handle_user_windows_continue:
- ldx [%g6 + TI_FLAGS], %l5
- andcc %l5, _TIF_PERFCTR, %g0
- sethi %hi(TSTATE_PEF), %o0
- bne,pn %xcc, __handle_perfctrs
-__handle_perfctrs_continue:
- andcc %l1, %o0, %g0
-
- /* This fpdepth clear is necessary for non-syscall rtraps only */
-user_nowork:
- bne,pn %xcc, __handle_userfpu
- stb %g0, [%g6 + TI_FPDEPTH]
-__handle_userfpu_continue:
-
-rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
- ldx [%sp + PTREGS_OFF + PT_V9_G2], %g2
-
- ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
- ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
- ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
- brz,pt %l3, 1f
- mov %g6, %l2
-
- /* Must do this before thread reg is clobbered below. */
- LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2)
-1:
- ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
- ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
-
- /* Normal globals are restored, go to trap globals. */
-661: wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
- nop
- .section .sun4v_2insn_patch, "ax"
- .word 661b
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- SET_GL(1)
- .previous
-
- mov %l2, %g6
-
- ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0
- ldx [%sp + PTREGS_OFF + PT_V9_I1], %i1
-
- ldx [%sp + PTREGS_OFF + PT_V9_I2], %i2
- ldx [%sp + PTREGS_OFF + PT_V9_I3], %i3
- ldx [%sp + PTREGS_OFF + PT_V9_I4], %i4
- ldx [%sp + PTREGS_OFF + PT_V9_I5], %i5
- ldx [%sp + PTREGS_OFF + PT_V9_I6], %i6
- ldx [%sp + PTREGS_OFF + PT_V9_I7], %i7
- ldx [%sp + PTREGS_OFF + PT_V9_TPC], %l2
- ldx [%sp + PTREGS_OFF + PT_V9_TNPC], %o2
-
- ld [%sp + PTREGS_OFF + PT_V9_Y], %o3
- wr %o3, %g0, %y
- 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
-
- brnz,pn %l3, kern_rtt
- mov PRIMARY_CONTEXT, %l7
-
-661: ldxa [%l7 + %l7] ASI_DMMU, %l0
- .section .sun4v_1insn_patch, "ax"
- .word 661b
- ldxa [%l7 + %l7] ASI_MMU, %l0
- .previous
-
- sethi %hi(sparc64_kern_pri_nuc_bits), %l1
- ldx [%l1 + %lo(sparc64_kern_pri_nuc_bits)], %l1
- or %l0, %l1, %l0
-
-661: stxa %l0, [%l7] ASI_DMMU
- .section .sun4v_1insn_patch, "ax"
- .word 661b
- stxa %l0, [%l7] ASI_MMU
- .previous
-
- sethi %hi(KERNBASE), %l7
- flush %l7
- rdpr %wstate, %l1
- rdpr %otherwin, %l2
- srl %l1, 3, %l1
-
- wrpr %l2, %g0, %canrestore
- wrpr %l1, %g0, %wstate
- brnz,pt %l2, user_rtt_restore
- wrpr %g0, %g0, %otherwin
-
- ldx [%g6 + TI_FLAGS], %g3
- wr %g0, ASI_AIUP, %asi
- rdpr %cwp, %g1
- andcc %g3, _TIF_32BIT, %g0
- 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
-
-661: stxa %g2, [%g1] ASI_DMMU
- .section .sun4v_1insn_patch, "ax"
- .word 661b
- stxa %g2, [%g1] ASI_MMU
- .previous
-
- 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
-
-661: nop
- .section .sun4v_1insn_patch, "ax"
- .word 661b
- SET_GL(0)
- .previous
-
- wrpr %g0, RTRAP_PSTATE, %pstate
-
- 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:
- restore
- rdpr %canrestore, %g1
- wrpr %g1, 0x0, %cleanwin
- retry
- nop
-
-kern_rtt: rdpr %canrestore, %g1
- brz,pn %g1, kern_rtt_fill
- nop
-kern_rtt_restore:
- stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
- restore
- retry
-
-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
- nop
- cmp %l4, 0
- 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
-
- membar #Sync
- ldda [%o3 + %o2] ASI_BLK_P, %f0
- ldda [%o4 + %o2] ASI_BLK_P, %f16
- membar #Sync
-1: andcc %l2, FPRS_DU, %g0
- be,pn %icc, 1f
- wr %g1, 0, %gsr
- add %o2, 0x80, %o2
- membar #Sync
- 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
- membar #Sync
- 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]
git.samba.org / sfrench / cifs-2.6.git / blobdiff