rtrap.S
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上传日期:2013-02-24
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- /* $Id: rtrap.S,v 1.57.2.1 2001/12/24 04:32:33 davem Exp $
- * 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 PTREGS_OFF (STACK_BIAS + REGWIN_SZ)
- #define RTRAP_PSTATE (PSTATE_RMO|PSTATE_PEF|PSTATE_PRIV|PSTATE_IE)
- #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_signal, and it must not be otherwise modified until
- * we fully commit to returning to userspace.
- */
- .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 + AOFF_task_need_resched], %l0
- brz,pt %l0, 1f
- nop
- call schedule
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- 1: lduw [%g6 + AOFF_task_sigpending], %l0
- brz,pt %l0, __handle_user_windows_continue
- nop
- clr %o0
- mov %l5, %o2
- mov %l6, %o3
- add %sp, STACK_BIAS + REGWIN_SZ, %o1
- call do_signal
- 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.
- */
- 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 + AOFF_task_thread + AOFF_thread_w_saved], %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
- 1: ldx [%g6 + AOFF_task_need_resched], %l0
- brz,pt %l0, 1f
- nop
- call schedule
- wrpr %g0, RTRAP_PSTATE, %pstate
- wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
- 1: lduw [%g6 + AOFF_task_sigpending], %l0
- brz,pt %l0, __handle_perfctrs_continue
- sethi %hi(TSTATE_PEF), %o0
- clr %o0
- mov %l5, %o2
- mov %l6, %o3
- add %sp, STACK_BIAS + REGWIN_SZ, %o1
- call do_signal
- 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.
- */
- 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:
- clr %o0
- mov %l5, %o2
- mov %l6, %o3
- add %sp, STACK_BIAS + REGWIN_SZ, %o1
- call do_signal
- 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.
- */
- 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
- .align 64
- .globl rtrap_clr_l6, rtrap, irqsz_patchme
- rtrap_clr_l6: clr %l6
- rtrap: lduw [%g6 + AOFF_task_processor], %l0
- sethi %hi(irq_stat), %l2 ! &softirq_active
- or %l2, %lo(irq_stat), %l2 ! &softirq_active
- irqsz_patchme: sllx %l0, 0, %l0
- lduw [%l2 + %l0], %l1 ! softirq_pending
- cmp %l1, 0
- bne,pn %icc, __handle_softirq
- ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
- __handle_softirq_continue:
- sethi %hi(0xf << 20), %l4
- andcc %l1, TSTATE_PRIV, %l3
- and %l1, %l4, %l4
- bne,pn %icc, to_kernel
- andn %l1, %l4, %l1
- /* 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 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
- __handle_preemption_continue:
- ldx [%g6 + AOFF_task_need_resched], %l0
- brnz,pn %l0, __handle_preemption
- lduw [%g6 + AOFF_task_sigpending], %l0
- brnz,pn %l0, __handle_signal
- nop
- __handle_signal_continue:
- ldub [%g6 + AOFF_task_thread + AOFF_thread_w_saved], %o2
- brnz,pn %o2, __handle_user_windows
- nop
- __handle_user_windows_continue:
- ldub [%g6 + AOFF_task_thread + AOFF_thread_flags], %l5
- andcc %l5, SPARC_FLAG_PERFCTR, %g0
- sethi %hi(TSTATE_PEF), %o0
- bne,pn %xcc, __handle_perfctrs
- __handle_perfctrs_continue:
- andcc %l1, %o0, %g0
- /* This fpdepth clear is neccessary for non-syscall rtraps only */
- bne,pn %xcc, __handle_userfpu
- stb %g0, [%g6 + AOFF_task_thread + AOFF_thread_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
- ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
- ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
- wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
- 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
- srl %l4, 20, %l4
- wrpr %l4, 0x0, %pil
- wrpr %g0, 0x1, %tl
- wrpr %l1, %g0, %tstate
- wrpr %l2, %g0, %tpc
- wrpr %o2, %g0, %tnpc
- brnz,pn %l3, kern_rtt
- mov PRIMARY_CONTEXT, %l7
- ldxa [%l7 + %l7] ASI_DMMU, %l0
- stxa %l0, [%l7] ASI_DMMU
- flush %g6
- rdpr %wstate, %l1
- rdpr %otherwin, %l2
- srl %l1, 3, %l1
- wrpr %l2, %g0, %canrestore
- wrpr %l1, %g0, %wstate
- wrpr %g0, %g0, %otherwin
- restore
- rdpr %canrestore, %g1
- wrpr %g1, 0x0, %cleanwin
- retry
- nop
- kern_rtt: restore
- retry
- to_kernel: ldub [%g6 + AOFF_task_thread + AOFF_thread_fpdepth], %l5
- brz,pt %l5, rt_continue
- srl %l5, 1, %o0
- add %g6, AOFF_task_thread + AOFF_thread_fpsaved, %l6
- ldub [%l6 + %o0], %l2
- sub %l5, 2, %l5
- add %g6, AOFF_task_thread + AOFF_thread_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, %g5
- wr %g5, FPRS_FEF, %fprs
- ldx [%o1 + %o5], %g5
- add %g6, AOFF_task_thread + AOFF_thread_xfsr, %o1
- membar #StoreLoad | #LoadLoad
- sll %o0, 8, %o2
- add %g6, AOFF_task_fpregs, %o3
- brz,pn %l6, 1f
- add %g6, AOFF_task_fpregs+0x40, %o4
- ldda [%o3 + %o2] ASI_BLK_P, %f0
- ldda [%o4 + %o2] ASI_BLK_P, %f16
- 1: andcc %l2, FPRS_DU, %g0
- be,pn %icc, 1f
- wr %g5, 0, %gsr
- add %o2, 0x80, %o2
- 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 + AOFF_task_thread + AOFF_thread_fpdepth]
- ba,pt %xcc, rt_continue
- nop
- 5: wr %g0, FPRS_FEF, %fprs
- membar #StoreLoad | #LoadLoad
- sll %o0, 8, %o2
- add %g6, AOFF_task_fpregs+0x80, %o3
- add %g6, AOFF_task_fpregs+0xc0, %o4
- 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 + AOFF_task_thread + AOFF_thread_fpdepth]
- #undef PTREGS_OFF