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| /* SPDX-License-Identifier: GPL-2.0 */
| /*
| * 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>
|
| #ifdef CONFIG_CONTEXT_TRACKING
| # define SCHEDULE_USER schedule_user
| #else
| # define SCHEDULE_USER schedule
| #endif
|
| .text
| .align 32
| __handle_preemption:
| call SCHEDULE_USER
| 661: wrpr %g0, RTRAP_PSTATE, %pstate
| /* If userspace is using ADI, it could potentially pass
| * a pointer with version tag embedded in it. To maintain
| * the ADI security, we must re-enable PSTATE.mcde before
| * we continue execution in the kernel for another thread.
| */
| .section .sun_m7_1insn_patch, "ax"
| .word 661b
| wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
| .previous
| ba,pt %xcc, __handle_preemption_continue
| wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
| __handle_user_windows:
| add %sp, PTREGS_OFF, %o0
| call fault_in_user_windows
| 661: wrpr %g0, RTRAP_PSTATE, %pstate
| /* If userspace is using ADI, it could potentially pass
| * a pointer with version tag embedded in it. To maintain
| * the ADI security, we must re-enable PSTATE.mcde before
| * we continue execution in the kernel for another thread.
| */
| .section .sun_m7_1insn_patch, "ax"
| .word 661b
| wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
| .previous
| ba,pt %xcc, __handle_preemption_continue
| wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate
|
| __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
| 661: wrpr %g0, RTRAP_PSTATE, %pstate
| /* If userspace is using ADI, it could potentially pass
| * a pointer with version tag embedded in it. To maintain
| * the ADI security, we must re-enable PSTATE.mcde before
| * we continue execution in the kernel for another thread.
| */
| .section .sun_m7_1insn_patch, "ax"
| .word 661b
| wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate
| .previous
| 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_preemption_continue
| srl %l4, 20, %l4
|
| /* 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
| nop
| /* Do not actually set the %pil here. We will do that
| * below after we clear PSTATE_IE in the %pstate register.
| * If we re-enable interrupts here, we can recurse down
| * the hardirq stack potentially endlessly, causing a
| * stack overflow.
| */
|
| .align 64
| .globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall
| rtrap_irq:
| rtrap:
| /* mm/ultra.S:xcall_report_regs KNOWS about this load. */
| ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1
| 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
| /* Do not actually set the %pil here. We will do that
| * below after we clear PSTATE_IE in the %pstate register.
| * If we re-enable interrupts here, we can recurse down
| * the hardirq stack potentially endlessly, causing a
| * stack overflow.
| *
| * It is tempting to put this test and trace_hardirqs_on
| * call at the 'rt_continue' label, but that will not work
| * as that path hits unconditionally and we do not want to
| * execute this in NMI return paths, for example.
| */
| #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 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
| ldub [%g6 + TI_WSAVED], %o2
| brnz,pn %o2, __handle_user_windows
| nop
| sethi %hi(TSTATE_PEF), %o0
| 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
|
| 661: wrpr %l2, %g0, %canrestore
| .section .fast_win_ctrl_1insn_patch, "ax"
| .word 661b
| .word 0x89880000 ! normalw
| .previous
|
| wrpr %l1, %g0, %wstate
| brnz,pt %l2, user_rtt_restore
| 661: wrpr %g0, %g0, %otherwin
| .section .fast_win_ctrl_1insn_patch, "ax"
| .word 661b
| nop
| .previous
|
| 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
| nop
|
| user_rtt_fill_fixup_dax:
| ba,pt %xcc, user_rtt_fill_fixup_common
| mov 1, %g3
|
| user_rtt_fill_fixup_mna:
| ba,pt %xcc, user_rtt_fill_fixup_common
| mov 2, %g3
|
| user_rtt_fill_fixup:
| ba,pt %xcc, user_rtt_fill_fixup_common
| clr %g3
|
| 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_PREEMPTION
| 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
| nop
| call preempt_schedule_irq
| nop
| ba,pt %xcc, rtrap
| #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]
|
|
