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699 lines
17 KiB
699 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* arch/sparc64/kernel/process.c |
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* |
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* Copyright (C) 1995, 1996, 2008 David S. Miller ([email protected]) |
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* Copyright (C) 1996 Eddie C. Dost ([email protected]) |
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* Copyright (C) 1997, 1998 Jakub Jelinek ([email protected]) |
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*/ |
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|
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/* |
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* This file handles the architecture-dependent parts of process handling.. |
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*/ |
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|
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#include <stdarg.h> |
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|
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#include <linux/errno.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/sched/debug.h> |
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#include <linux/sched/task.h> |
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#include <linux/sched/task_stack.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/fs.h> |
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#include <linux/smp.h> |
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#include <linux/stddef.h> |
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#include <linux/ptrace.h> |
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#include <linux/slab.h> |
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#include <linux/user.h> |
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#include <linux/delay.h> |
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#include <linux/compat.h> |
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#include <linux/tick.h> |
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#include <linux/init.h> |
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#include <linux/cpu.h> |
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#include <linux/perf_event.h> |
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#include <linux/elfcore.h> |
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#include <linux/sysrq.h> |
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#include <linux/nmi.h> |
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#include <linux/context_tracking.h> |
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#include <linux/signal.h> |
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#include <linux/uaccess.h> |
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#include <asm/page.h> |
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#include <asm/pgalloc.h> |
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#include <asm/processor.h> |
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#include <asm/pstate.h> |
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#include <asm/elf.h> |
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#include <asm/fpumacro.h> |
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#include <asm/head.h> |
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#include <asm/cpudata.h> |
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#include <asm/mmu_context.h> |
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#include <asm/unistd.h> |
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#include <asm/hypervisor.h> |
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#include <asm/syscalls.h> |
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#include <asm/irq_regs.h> |
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#include <asm/smp.h> |
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#include <asm/pcr.h> |
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#include "kstack.h" |
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/* Idle loop support on sparc64. */ |
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void arch_cpu_idle(void) |
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{ |
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if (tlb_type != hypervisor) { |
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touch_nmi_watchdog(); |
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raw_local_irq_enable(); |
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} else { |
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unsigned long pstate; |
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raw_local_irq_enable(); |
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/* The sun4v sleeping code requires that we have PSTATE.IE cleared over |
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* the cpu sleep hypervisor call. |
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*/ |
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__asm__ __volatile__( |
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"rdpr %%pstate, %0\n\t" |
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"andn %0, %1, %0\n\t" |
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"wrpr %0, %%g0, %%pstate" |
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: "=&r" (pstate) |
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: "i" (PSTATE_IE)); |
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if (!need_resched() && !cpu_is_offline(smp_processor_id())) { |
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sun4v_cpu_yield(); |
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/* If resumed by cpu_poke then we need to explicitly |
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* call scheduler_ipi(). |
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*/ |
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scheduler_poke(); |
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} |
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/* Re-enable interrupts. */ |
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__asm__ __volatile__( |
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"rdpr %%pstate, %0\n\t" |
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"or %0, %1, %0\n\t" |
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"wrpr %0, %%g0, %%pstate" |
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: "=&r" (pstate) |
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: "i" (PSTATE_IE)); |
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} |
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} |
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#ifdef CONFIG_HOTPLUG_CPU |
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void arch_cpu_idle_dead(void) |
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{ |
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sched_preempt_enable_no_resched(); |
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cpu_play_dead(); |
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} |
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#endif |
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#ifdef CONFIG_COMPAT |
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static void show_regwindow32(struct pt_regs *regs) |
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{ |
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struct reg_window32 __user *rw; |
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struct reg_window32 r_w; |
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mm_segment_t old_fs; |
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__asm__ __volatile__ ("flushw"); |
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rw = compat_ptr((unsigned int)regs->u_regs[14]); |
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old_fs = get_fs(); |
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set_fs (USER_DS); |
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if (copy_from_user (&r_w, rw, sizeof(r_w))) { |
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set_fs (old_fs); |
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return; |
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} |
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set_fs (old_fs); |
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printk("l0: %08x l1: %08x l2: %08x l3: %08x " |
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"l4: %08x l5: %08x l6: %08x l7: %08x\n", |
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r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], |
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r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); |
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printk("i0: %08x i1: %08x i2: %08x i3: %08x " |
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"i4: %08x i5: %08x i6: %08x i7: %08x\n", |
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r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], |
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r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); |
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} |
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#else |
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#define show_regwindow32(regs) do { } while (0) |
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#endif |
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static void show_regwindow(struct pt_regs *regs) |
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{ |
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struct reg_window __user *rw; |
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struct reg_window *rwk; |
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struct reg_window r_w; |
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mm_segment_t old_fs; |
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if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { |
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__asm__ __volatile__ ("flushw"); |
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rw = (struct reg_window __user *) |
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(regs->u_regs[14] + STACK_BIAS); |
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rwk = (struct reg_window *) |
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(regs->u_regs[14] + STACK_BIAS); |
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if (!(regs->tstate & TSTATE_PRIV)) { |
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old_fs = get_fs(); |
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set_fs (USER_DS); |
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if (copy_from_user (&r_w, rw, sizeof(r_w))) { |
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set_fs (old_fs); |
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return; |
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} |
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rwk = &r_w; |
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set_fs (old_fs); |
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} |
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} else { |
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show_regwindow32(regs); |
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return; |
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} |
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printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", |
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rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); |
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printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", |
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rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); |
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printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", |
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rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); |
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printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", |
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rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); |
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if (regs->tstate & TSTATE_PRIV) |
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printk("I7: <%pS>\n", (void *) rwk->ins[7]); |
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} |
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void show_regs(struct pt_regs *regs) |
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{ |
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show_regs_print_info(KERN_DEFAULT); |
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printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, |
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regs->tpc, regs->tnpc, regs->y, print_tainted()); |
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printk("TPC: <%pS>\n", (void *) regs->tpc); |
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printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", |
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regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], |
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regs->u_regs[3]); |
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printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", |
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regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], |
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regs->u_regs[7]); |
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printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", |
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regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], |
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regs->u_regs[11]); |
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printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", |
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regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], |
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regs->u_regs[15]); |
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printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); |
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show_regwindow(regs); |
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show_stack(current, (unsigned long *)regs->u_regs[UREG_FP], KERN_DEFAULT); |
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} |
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union global_cpu_snapshot global_cpu_snapshot[NR_CPUS]; |
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static DEFINE_SPINLOCK(global_cpu_snapshot_lock); |
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static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, |
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int this_cpu) |
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{ |
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struct global_reg_snapshot *rp; |
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flushw_all(); |
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rp = &global_cpu_snapshot[this_cpu].reg; |
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rp->tstate = regs->tstate; |
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rp->tpc = regs->tpc; |
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rp->tnpc = regs->tnpc; |
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rp->o7 = regs->u_regs[UREG_I7]; |
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if (regs->tstate & TSTATE_PRIV) { |
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struct reg_window *rw; |
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rw = (struct reg_window *) |
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(regs->u_regs[UREG_FP] + STACK_BIAS); |
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if (kstack_valid(tp, (unsigned long) rw)) { |
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rp->i7 = rw->ins[7]; |
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rw = (struct reg_window *) |
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(rw->ins[6] + STACK_BIAS); |
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if (kstack_valid(tp, (unsigned long) rw)) |
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rp->rpc = rw->ins[7]; |
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} |
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} else { |
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rp->i7 = 0; |
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rp->rpc = 0; |
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} |
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rp->thread = tp; |
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} |
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/* In order to avoid hangs we do not try to synchronize with the |
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* global register dump client cpus. The last store they make is to |
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* the thread pointer, so do a short poll waiting for that to become |
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* non-NULL. |
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*/ |
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static void __global_reg_poll(struct global_reg_snapshot *gp) |
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{ |
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int limit = 0; |
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while (!gp->thread && ++limit < 100) { |
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barrier(); |
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udelay(1); |
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} |
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} |
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void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) |
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{ |
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struct thread_info *tp = current_thread_info(); |
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struct pt_regs *regs = get_irq_regs(); |
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unsigned long flags; |
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int this_cpu, cpu; |
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if (!regs) |
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regs = tp->kregs; |
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spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
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this_cpu = raw_smp_processor_id(); |
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
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if (cpumask_test_cpu(this_cpu, mask) && !exclude_self) |
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__global_reg_self(tp, regs, this_cpu); |
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smp_fetch_global_regs(); |
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for_each_cpu(cpu, mask) { |
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struct global_reg_snapshot *gp; |
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if (exclude_self && cpu == this_cpu) |
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continue; |
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gp = &global_cpu_snapshot[cpu].reg; |
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__global_reg_poll(gp); |
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tp = gp->thread; |
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printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", |
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(cpu == this_cpu ? '*' : ' '), cpu, |
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gp->tstate, gp->tpc, gp->tnpc, |
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((tp && tp->task) ? tp->task->comm : "NULL"), |
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((tp && tp->task) ? tp->task->pid : -1)); |
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if (gp->tstate & TSTATE_PRIV) { |
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printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", |
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(void *) gp->tpc, |
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(void *) gp->o7, |
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(void *) gp->i7, |
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(void *) gp->rpc); |
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} else { |
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printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", |
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gp->tpc, gp->o7, gp->i7, gp->rpc); |
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} |
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touch_nmi_watchdog(); |
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} |
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
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spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
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} |
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#ifdef CONFIG_MAGIC_SYSRQ |
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static void sysrq_handle_globreg(int key) |
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{ |
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trigger_all_cpu_backtrace(); |
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} |
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static const struct sysrq_key_op sparc_globalreg_op = { |
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.handler = sysrq_handle_globreg, |
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.help_msg = "global-regs(y)", |
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.action_msg = "Show Global CPU Regs", |
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}; |
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static void __global_pmu_self(int this_cpu) |
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{ |
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struct global_pmu_snapshot *pp; |
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int i, num; |
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if (!pcr_ops) |
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return; |
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pp = &global_cpu_snapshot[this_cpu].pmu; |
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num = 1; |
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if (tlb_type == hypervisor && |
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sun4v_chip_type >= SUN4V_CHIP_NIAGARA4) |
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num = 4; |
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for (i = 0; i < num; i++) { |
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pp->pcr[i] = pcr_ops->read_pcr(i); |
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pp->pic[i] = pcr_ops->read_pic(i); |
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} |
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} |
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static void __global_pmu_poll(struct global_pmu_snapshot *pp) |
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{ |
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int limit = 0; |
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while (!pp->pcr[0] && ++limit < 100) { |
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barrier(); |
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udelay(1); |
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} |
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} |
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static void pmu_snapshot_all_cpus(void) |
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{ |
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unsigned long flags; |
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int this_cpu, cpu; |
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spin_lock_irqsave(&global_cpu_snapshot_lock, flags); |
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
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this_cpu = raw_smp_processor_id(); |
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__global_pmu_self(this_cpu); |
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smp_fetch_global_pmu(); |
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for_each_online_cpu(cpu) { |
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struct global_pmu_snapshot *pp = &global_cpu_snapshot[cpu].pmu; |
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__global_pmu_poll(pp); |
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printk("%c CPU[%3d]: PCR[%08lx:%08lx:%08lx:%08lx] PIC[%08lx:%08lx:%08lx:%08lx]\n", |
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(cpu == this_cpu ? '*' : ' '), cpu, |
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pp->pcr[0], pp->pcr[1], pp->pcr[2], pp->pcr[3], |
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pp->pic[0], pp->pic[1], pp->pic[2], pp->pic[3]); |
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touch_nmi_watchdog(); |
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} |
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memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot)); |
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spin_unlock_irqrestore(&global_cpu_snapshot_lock, flags); |
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} |
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static void sysrq_handle_globpmu(int key) |
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{ |
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pmu_snapshot_all_cpus(); |
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} |
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static const struct sysrq_key_op sparc_globalpmu_op = { |
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.handler = sysrq_handle_globpmu, |
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.help_msg = "global-pmu(x)", |
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.action_msg = "Show Global PMU Regs", |
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}; |
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static int __init sparc_sysrq_init(void) |
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{ |
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int ret = register_sysrq_key('y', &sparc_globalreg_op); |
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if (!ret) |
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ret = register_sysrq_key('x', &sparc_globalpmu_op); |
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return ret; |
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} |
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core_initcall(sparc_sysrq_init); |
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#endif |
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/* Free current thread data structures etc.. */ |
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void exit_thread(struct task_struct *tsk) |
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{ |
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struct thread_info *t = task_thread_info(tsk); |
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if (t->utraps) { |
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if (t->utraps[0] < 2) |
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kfree (t->utraps); |
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else |
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t->utraps[0]--; |
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} |
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} |
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void flush_thread(void) |
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{ |
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struct thread_info *t = current_thread_info(); |
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struct mm_struct *mm; |
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mm = t->task->mm; |
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if (mm) |
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tsb_context_switch(mm); |
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set_thread_wsaved(0); |
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/* Clear FPU register state. */ |
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t->fpsaved[0] = 0; |
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} |
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/* It's a bit more tricky when 64-bit tasks are involved... */ |
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static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) |
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{ |
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bool stack_64bit = test_thread_64bit_stack(psp); |
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unsigned long fp, distance, rval; |
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if (stack_64bit) { |
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csp += STACK_BIAS; |
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psp += STACK_BIAS; |
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__get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); |
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fp += STACK_BIAS; |
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if (test_thread_flag(TIF_32BIT)) |
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fp &= 0xffffffff; |
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} else |
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__get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); |
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|
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/* Now align the stack as this is mandatory in the Sparc ABI |
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* due to how register windows work. This hides the |
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* restriction from thread libraries etc. |
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*/ |
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csp &= ~15UL; |
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distance = fp - psp; |
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rval = (csp - distance); |
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if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) |
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rval = 0; |
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else if (!stack_64bit) { |
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if (put_user(((u32)csp), |
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&(((struct reg_window32 __user *)rval)->ins[6]))) |
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rval = 0; |
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} else { |
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if (put_user(((u64)csp - STACK_BIAS), |
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&(((struct reg_window __user *)rval)->ins[6]))) |
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rval = 0; |
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else |
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rval = rval - STACK_BIAS; |
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} |
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return rval; |
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} |
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|
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/* Standard stuff. */ |
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static inline void shift_window_buffer(int first_win, int last_win, |
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struct thread_info *t) |
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{ |
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int i; |
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|
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for (i = first_win; i < last_win; i++) { |
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t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; |
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memcpy(&t->reg_window[i], &t->reg_window[i+1], |
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sizeof(struct reg_window)); |
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} |
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} |
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void synchronize_user_stack(void) |
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{ |
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struct thread_info *t = current_thread_info(); |
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unsigned long window; |
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flush_user_windows(); |
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if ((window = get_thread_wsaved()) != 0) { |
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window -= 1; |
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do { |
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struct reg_window *rwin = &t->reg_window[window]; |
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int winsize = sizeof(struct reg_window); |
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unsigned long sp; |
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sp = t->rwbuf_stkptrs[window]; |
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|
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if (test_thread_64bit_stack(sp)) |
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sp += STACK_BIAS; |
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else |
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winsize = sizeof(struct reg_window32); |
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if (!copy_to_user((char __user *)sp, rwin, winsize)) { |
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shift_window_buffer(window, get_thread_wsaved() - 1, t); |
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set_thread_wsaved(get_thread_wsaved() - 1); |
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} |
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} while (window--); |
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} |
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} |
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static void stack_unaligned(unsigned long sp) |
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{ |
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force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *) sp, 0); |
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} |
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static const char uwfault32[] = KERN_INFO \ |
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"%s[%d]: bad register window fault: SP %08lx (orig_sp %08lx) TPC %08lx O7 %08lx\n"; |
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static const char uwfault64[] = KERN_INFO \ |
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"%s[%d]: bad register window fault: SP %016lx (orig_sp %016lx) TPC %08lx O7 %016lx\n"; |
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|
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void fault_in_user_windows(struct pt_regs *regs) |
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{ |
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struct thread_info *t = current_thread_info(); |
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unsigned long window; |
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flush_user_windows(); |
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window = get_thread_wsaved(); |
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|
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if (likely(window != 0)) { |
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window -= 1; |
|
do { |
|
struct reg_window *rwin = &t->reg_window[window]; |
|
int winsize = sizeof(struct reg_window); |
|
unsigned long sp, orig_sp; |
|
|
|
orig_sp = sp = t->rwbuf_stkptrs[window]; |
|
|
|
if (test_thread_64bit_stack(sp)) |
|
sp += STACK_BIAS; |
|
else |
|
winsize = sizeof(struct reg_window32); |
|
|
|
if (unlikely(sp & 0x7UL)) |
|
stack_unaligned(sp); |
|
|
|
if (unlikely(copy_to_user((char __user *)sp, |
|
rwin, winsize))) { |
|
if (show_unhandled_signals) |
|
printk_ratelimited(is_compat_task() ? |
|
uwfault32 : uwfault64, |
|
current->comm, current->pid, |
|
sp, orig_sp, |
|
regs->tpc, |
|
regs->u_regs[UREG_I7]); |
|
goto barf; |
|
} |
|
} while (window--); |
|
} |
|
set_thread_wsaved(0); |
|
return; |
|
|
|
barf: |
|
set_thread_wsaved(window + 1); |
|
force_sig(SIGSEGV); |
|
} |
|
|
|
/* Copy a Sparc thread. The fork() return value conventions |
|
* under SunOS are nothing short of bletcherous: |
|
* Parent --> %o0 == childs pid, %o1 == 0 |
|
* Child --> %o0 == parents pid, %o1 == 1 |
|
*/ |
|
int copy_thread(unsigned long clone_flags, unsigned long sp, unsigned long arg, |
|
struct task_struct *p, unsigned long tls) |
|
{ |
|
struct thread_info *t = task_thread_info(p); |
|
struct pt_regs *regs = current_pt_regs(); |
|
struct sparc_stackf *parent_sf; |
|
unsigned long child_stack_sz; |
|
char *child_trap_frame; |
|
|
|
/* Calculate offset to stack_frame & pt_regs */ |
|
child_stack_sz = (STACKFRAME_SZ + TRACEREG_SZ); |
|
child_trap_frame = (task_stack_page(p) + |
|
(THREAD_SIZE - child_stack_sz)); |
|
|
|
t->new_child = 1; |
|
t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; |
|
t->kregs = (struct pt_regs *) (child_trap_frame + |
|
sizeof(struct sparc_stackf)); |
|
t->fpsaved[0] = 0; |
|
|
|
if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
|
memset(child_trap_frame, 0, child_stack_sz); |
|
__thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = |
|
(current_pt_regs()->tstate + 1) & TSTATE_CWP; |
|
t->current_ds = ASI_P; |
|
t->kregs->u_regs[UREG_G1] = sp; /* function */ |
|
t->kregs->u_regs[UREG_G2] = arg; |
|
return 0; |
|
} |
|
|
|
parent_sf = ((struct sparc_stackf *) regs) - 1; |
|
memcpy(child_trap_frame, parent_sf, child_stack_sz); |
|
if (t->flags & _TIF_32BIT) { |
|
sp &= 0x00000000ffffffffUL; |
|
regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; |
|
} |
|
t->kregs->u_regs[UREG_FP] = sp; |
|
__thread_flag_byte_ptr(t)[TI_FLAG_BYTE_CWP] = |
|
(regs->tstate + 1) & TSTATE_CWP; |
|
t->current_ds = ASI_AIUS; |
|
if (sp != regs->u_regs[UREG_FP]) { |
|
unsigned long csp; |
|
|
|
csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); |
|
if (!csp) |
|
return -EFAULT; |
|
t->kregs->u_regs[UREG_FP] = csp; |
|
} |
|
if (t->utraps) |
|
t->utraps[0]++; |
|
|
|
/* Set the return value for the child. */ |
|
t->kregs->u_regs[UREG_I0] = current->pid; |
|
t->kregs->u_regs[UREG_I1] = 1; |
|
|
|
/* Set the second return value for the parent. */ |
|
regs->u_regs[UREG_I1] = 0; |
|
|
|
if (clone_flags & CLONE_SETTLS) |
|
t->kregs->u_regs[UREG_G7] = tls; |
|
|
|
return 0; |
|
} |
|
|
|
/* TIF_MCDPER in thread info flags for current task is updated lazily upon |
|
* a context switch. Update this flag in current task's thread flags |
|
* before dup so the dup'd task will inherit the current TIF_MCDPER flag. |
|
*/ |
|
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src) |
|
{ |
|
if (adi_capable()) { |
|
register unsigned long tmp_mcdper; |
|
|
|
__asm__ __volatile__( |
|
".word 0x83438000\n\t" /* rd %mcdper, %g1 */ |
|
"mov %%g1, %0\n\t" |
|
: "=r" (tmp_mcdper) |
|
: |
|
: "g1"); |
|
if (tmp_mcdper) |
|
set_thread_flag(TIF_MCDPER); |
|
else |
|
clear_thread_flag(TIF_MCDPER); |
|
} |
|
|
|
*dst = *src; |
|
return 0; |
|
} |
|
|
|
unsigned long get_wchan(struct task_struct *task) |
|
{ |
|
unsigned long pc, fp, bias = 0; |
|
struct thread_info *tp; |
|
struct reg_window *rw; |
|
unsigned long ret = 0; |
|
int count = 0; |
|
|
|
if (!task || task == current || |
|
task->state == TASK_RUNNING) |
|
goto out; |
|
|
|
tp = task_thread_info(task); |
|
bias = STACK_BIAS; |
|
fp = task_thread_info(task)->ksp + bias; |
|
|
|
do { |
|
if (!kstack_valid(tp, fp)) |
|
break; |
|
rw = (struct reg_window *) fp; |
|
pc = rw->ins[7]; |
|
if (!in_sched_functions(pc)) { |
|
ret = pc; |
|
goto out; |
|
} |
|
fp = rw->ins[6] + bias; |
|
} while (++count < 16); |
|
|
|
out: |
|
return ret; |
|
}
|
|
|