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Diffstat (limited to 'arch/sparc64/kernel/rtrap.S')
| -rw-r--r-- | arch/sparc64/kernel/rtrap.S | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S new file mode 100644 index 000000000000..0696ed4b9d64 --- /dev/null +++ b/arch/sparc64/kernel/rtrap.S @@ -0,0 +1,362 @@ +/* $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) + * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) + */ + +#include <linux/config.h> + +#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_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_notify_resume, 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 + 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_NOTIFY_RESUME | _TIF_SIGPENDING), %g0 + be,pt %xcc, __handle_user_windows_continue + nop + clr %o0 + mov %l5, %o2 + mov %l6, %o3 + add %sp, PTREGS_OFF, %o1 + mov %l0, %o4 + + 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. + */ + 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_NOTIFY_RESUME | _TIF_SIGPENDING), %g0 + + be,pt %xcc, __handle_perfctrs_continue + sethi %hi(TSTATE_PEF), %o0 + clr %o0 + mov %l5, %o2 + mov %l6, %o3 + add %sp, PTREGS_OFF, %o1 + mov %l0, %o4 + 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. + */ + 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, PTREGS_OFF, %o1 + mov %l0, %o4 + 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. + */ + 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_irq, rtrap_clr_l6, rtrap, irqsz_patchme, rtrap_xcall +rtrap_irq: +rtrap_clr_l6: clr %l6 +rtrap: + ldub [%g6 + TI_CPU], %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 + + /* 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 + 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 + 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_NOTIFY_RESUME | _TIF_SIGPENDING), %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 + mov TSB_REG, %g6 + brnz,a,pn %l3, 1f + ldxa [%g6] ASI_IMMU, %g5 +1: 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 +cplus_rtrap_insn_1: + sethi %hi(0), %l1 + sllx %l1, 32, %l1 + or %l0, %l1, %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: +#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 + srl %l4, 20, %l5 + cmp %l5, 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 + membar #StoreLoad | #LoadLoad + sll %o0, 8, %o2 + add %g6, TI_FPREGS, %o3 + brz,pn %l6, 1f + add %g6, TI_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 %g1, 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 + TI_FPDEPTH] + ba,pt %xcc, rt_continue + nop +5: wr %g0, FPRS_FEF, %fprs + membar #StoreLoad | #LoadLoad + sll %o0, 8, %o2 + + add %g6, TI_FPREGS+0x80, %o3 + add %g6, TI_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 + TI_FPDEPTH] + +cplus_rinsn_1: + sethi %uhi(CTX_CHEETAH_PLUS_NUC), %l1 + + .globl cheetah_plus_patch_rtrap +cheetah_plus_patch_rtrap: + /* We configure the dTLB512_0 for 4MB pages and the + * dTLB512_1 for 8K pages when in context zero. + */ + sethi %hi(cplus_rinsn_1), %o0 + sethi %hi(cplus_rtrap_insn_1), %o2 + lduw [%o0 + %lo(cplus_rinsn_1)], %o1 + or %o2, %lo(cplus_rtrap_insn_1), %o2 + stw %o1, [%o2] + flush %o2 + + retl + nop |