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378 lines
10 KiB
378 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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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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#ifdef CONFIG_CONTEXT_TRACKING |
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# define SCHEDULE_USER schedule_user |
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#else |
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# define SCHEDULE_USER schedule |
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#endif |
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.text |
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.align 32 |
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__handle_preemption: |
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call SCHEDULE_USER |
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661: wrpr %g0, RTRAP_PSTATE, %pstate |
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/* If userspace is using ADI, it could potentially pass |
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* a pointer with version tag embedded in it. To maintain |
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* the ADI security, we must re-enable PSTATE.mcde before |
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* we continue execution in the kernel for another thread. |
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*/ |
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.section .sun_m7_1insn_patch, "ax" |
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.word 661b |
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wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate |
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.previous |
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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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add %sp, PTREGS_OFF, %o0 |
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call fault_in_user_windows |
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661: wrpr %g0, RTRAP_PSTATE, %pstate |
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/* If userspace is using ADI, it could potentially pass |
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* a pointer with version tag embedded in it. To maintain |
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* the ADI security, we must re-enable PSTATE.mcde before |
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* we continue execution in the kernel for another thread. |
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*/ |
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.section .sun_m7_1insn_patch, "ax" |
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.word 661b |
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wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate |
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.previous |
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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_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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mov %l5, %o1 |
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add %sp, PTREGS_OFF, %o0 |
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mov %l0, %o2 |
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call do_notify_resume |
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661: wrpr %g0, RTRAP_PSTATE, %pstate |
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/* If userspace is using ADI, it could potentially pass |
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* a pointer with version tag embedded in it. To maintain |
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* the ADI security, we must re-enable PSTATE.mcde before |
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* we continue execution in the kernel for another thread. |
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*/ |
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.section .sun_m7_1insn_patch, "ax" |
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.word 661b |
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wrpr %g0, RTRAP_PSTATE|PSTATE_MCDE, %pstate |
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.previous |
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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_preemption_continue |
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srl %l4, 20, %l4 |
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/* When returning from a NMI (%pil==15) interrupt we want to |
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* avoid running softirqs, doing IRQ tracing, preempting, etc. |
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*/ |
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.globl rtrap_nmi |
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rtrap_nmi: 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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srl %l4, 20, %l4 |
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ba,pt %xcc, rtrap_no_irq_enable |
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nop |
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/* Do not actually set the %pil here. We will do that |
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* below after we clear PSTATE_IE in the %pstate register. |
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* If we re-enable interrupts here, we can recurse down |
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* the hardirq stack potentially endlessly, causing a |
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* stack overflow. |
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*/ |
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.align 64 |
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.globl rtrap_irq, rtrap, irqsz_patchme, rtrap_xcall |
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rtrap_irq: |
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rtrap: |
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/* mm/ultra.S:xcall_report_regs KNOWS about this load. */ |
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ldx [%sp + PTREGS_OFF + PT_V9_TSTATE], %l1 |
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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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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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/* Do not actually set the %pil here. We will do that |
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* below after we clear PSTATE_IE in the %pstate register. |
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* If we re-enable interrupts here, we can recurse down |
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* the hardirq stack potentially endlessly, causing a |
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* stack overflow. |
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* |
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* It is tempting to put this test and trace_hardirqs_on |
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* call at the 'rt_continue' label, but that will not work |
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* as that path hits unconditionally and we do not want to |
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* execute this in NMI return paths, for example. |
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*/ |
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#endif |
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rtrap_no_irq_enable: |
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andcc %l1, TSTATE_PRIV, %l3 |
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bne,pn %icc, to_kernel |
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nop |
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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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* 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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* |
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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 user |
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* windows, we have to redo all of these sched+signal checks |
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* 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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andcc %l0, _TIF_DO_NOTIFY_RESUME_MASK, %g0 |
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bne,pn %xcc, __handle_signal |
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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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sethi %hi(TSTATE_PEF), %o0 |
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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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brz,pt %l3, 1f |
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mov %g6, %l2 |
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/* Must do this before thread reg is clobbered below. */ |
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LOAD_PER_CPU_BASE(%g5, %g6, %i0, %i1, %i2) |
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1: |
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ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6 |
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ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7 |
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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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nop |
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.section .sun4v_2insn_patch, "ax" |
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.word 661b |
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wrpr %g0, RTRAP_PSTATE_IRQOFF, %pstate |
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SET_GL(1) |
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.previous |
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mov %l2, %g6 |
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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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andn %l1, TSTATE_SYSCALL, %l1 |
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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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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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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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or %l0, %l1, %l0 |
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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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sethi %hi(KERNBASE), %l7 |
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flush %l7 |
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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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661: wrpr %l2, %g0, %canrestore |
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.section .fast_win_ctrl_1insn_patch, "ax" |
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.word 661b |
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.word 0x89880000 ! normalw |
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.previous |
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wrpr %l1, %g0, %wstate |
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brnz,pt %l2, user_rtt_restore |
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661: wrpr %g0, %g0, %otherwin |
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.section .fast_win_ctrl_1insn_patch, "ax" |
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.word 661b |
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nop |
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.previous |
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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 |
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bne,pt %xcc, user_rtt_fill_32bit |
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wrpr %g1, %cwp |
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ba,a,pt %xcc, user_rtt_fill_64bit |
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nop |
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user_rtt_fill_fixup_dax: |
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ba,pt %xcc, user_rtt_fill_fixup_common |
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mov 1, %g3 |
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user_rtt_fill_fixup_mna: |
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ba,pt %xcc, user_rtt_fill_fixup_common |
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mov 2, %g3 |
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user_rtt_fill_fixup: |
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ba,pt %xcc, user_rtt_fill_fixup_common |
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clr %g3 |
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user_rtt_pre_restore: |
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add %g1, 1, %g1 |
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wrpr %g1, 0x0, %cwp |
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user_rtt_restore: |
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restore |
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rdpr %canrestore, %g1 |
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wrpr %g1, 0x0, %cleanwin |
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retry |
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nop |
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kern_rtt: rdpr %canrestore, %g1 |
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brz,pn %g1, kern_rtt_fill |
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nop |
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kern_rtt_restore: |
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stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC] |
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restore |
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retry |
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to_kernel: |
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#ifdef CONFIG_PREEMPTION |
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ldsw [%g6 + TI_PRE_COUNT], %l5 |
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brnz %l5, kern_fpucheck |
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ldx [%g6 + TI_FLAGS], %l5 |
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andcc %l5, _TIF_NEED_RESCHED, %g0 |
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be,pt %xcc, kern_fpucheck |
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nop |
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cmp %l4, 0 |
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bne,pn %xcc, kern_fpucheck |
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nop |
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call preempt_schedule_irq |
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nop |
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ba,pt %xcc, rtrap |
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#endif |
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kern_fpucheck: ldub [%g6 + TI_FPDEPTH], %l5 |
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brz,pt %l5, rt_continue |
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srl %l5, 1, %o0 |
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add %g6, TI_FPSAVED, %l6 |
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ldub [%l6 + %o0], %l2 |
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sub %l5, 2, %l5 |
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add %g6, TI_GSR, %o1 |
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andcc %l2, (FPRS_FEF|FPRS_DU), %g0 |
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be,pt %icc, 2f |
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and %l2, FPRS_DL, %l6 |
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andcc %l2, FPRS_FEF, %g0 |
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be,pn %icc, 5f |
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sll %o0, 3, %o5 |
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rd %fprs, %g1 |
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wr %g1, FPRS_FEF, %fprs |
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ldx [%o1 + %o5], %g1 |
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add %g6, TI_XFSR, %o1 |
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sll %o0, 8, %o2 |
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add %g6, TI_FPREGS, %o3 |
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brz,pn %l6, 1f |
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add %g6, TI_FPREGS+0x40, %o4 |
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membar #Sync |
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ldda [%o3 + %o2] ASI_BLK_P, %f0 |
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ldda [%o4 + %o2] ASI_BLK_P, %f16 |
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membar #Sync |
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1: andcc %l2, FPRS_DU, %g0 |
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be,pn %icc, 1f |
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wr %g1, 0, %gsr |
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add %o2, 0x80, %o2 |
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membar #Sync |
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ldda [%o3 + %o2] ASI_BLK_P, %f32 |
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ldda [%o4 + %o2] ASI_BLK_P, %f48 |
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1: membar #Sync |
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ldx [%o1 + %o5], %fsr |
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2: stb %l5, [%g6 + TI_FPDEPTH] |
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ba,pt %xcc, rt_continue |
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nop |
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5: wr %g0, FPRS_FEF, %fprs |
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sll %o0, 8, %o2 |
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add %g6, TI_FPREGS+0x80, %o3 |
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add %g6, TI_FPREGS+0xc0, %o4 |
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membar #Sync |
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ldda [%o3 + %o2] ASI_BLK_P, %f32 |
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ldda [%o4 + %o2] ASI_BLK_P, %f48 |
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membar #Sync |
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wr %g0, FPRS_DU, %fprs |
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ba,pt %xcc, rt_continue |
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stb %l5, [%g6 + TI_FPDEPTH]
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