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270 lines
7.0 KiB
270 lines
7.0 KiB
/* |
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* Architecture-dependent parts of process handling. |
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* |
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* Copyright (C) 2013 Altera Corporation |
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* Copyright (C) 2010 Tobias Klauser <[email protected]> |
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* Copyright (C) 2009 Wind River Systems Inc |
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* Implemented by [email protected] and [email protected] |
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* Copyright (C) 2004 Microtronix Datacom Ltd |
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* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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*/ |
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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/mm_types.h> |
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#include <linux/tick.h> |
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#include <linux/uaccess.h> |
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#include <asm/unistd.h> |
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#include <asm/traps.h> |
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#include <asm/cpuinfo.h> |
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asmlinkage void ret_from_fork(void); |
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asmlinkage void ret_from_kernel_thread(void); |
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void (*pm_power_off)(void) = NULL; |
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EXPORT_SYMBOL(pm_power_off); |
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void arch_cpu_idle(void) |
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{ |
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raw_local_irq_enable(); |
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} |
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/* |
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* The development boards have no way to pull a board reset. Just jump to the |
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* cpu reset address and let the boot loader or the code in head.S take care of |
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* resetting peripherals. |
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*/ |
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void machine_restart(char *__unused) |
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{ |
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pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr); |
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local_irq_disable(); |
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__asm__ __volatile__ ( |
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"jmp %0\n\t" |
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: |
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: "r" (cpuinfo.reset_addr) |
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: "r4"); |
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} |
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void machine_halt(void) |
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{ |
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pr_notice("Machine halt...\n"); |
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local_irq_disable(); |
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for (;;) |
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; |
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} |
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/* |
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* There is no way to power off the development boards. So just spin for now. If |
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* we ever have a way of resetting a board using a GPIO we should add that here. |
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*/ |
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void machine_power_off(void) |
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{ |
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pr_notice("Machine power off...\n"); |
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local_irq_disable(); |
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for (;;) |
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; |
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} |
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void show_regs(struct pt_regs *regs) |
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{ |
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pr_notice("\n"); |
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show_regs_print_info(KERN_DEFAULT); |
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pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n", |
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regs->r1, regs->r2, regs->r3, regs->r4); |
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pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n", |
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regs->r5, regs->r6, regs->r7, regs->r8); |
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pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n", |
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regs->r9, regs->r10, regs->r11, regs->r12); |
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pr_notice("r13: %08lx r14: %08lx r15: %08lx\n", |
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regs->r13, regs->r14, regs->r15); |
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pr_notice("ra: %08lx fp: %08lx sp: %08lx gp: %08lx\n", |
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regs->ra, regs->fp, regs->sp, regs->gp); |
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pr_notice("ea: %08lx estatus: %08lx\n", |
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regs->ea, regs->estatus); |
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} |
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void flush_thread(void) |
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{ |
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} |
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int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg, |
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struct task_struct *p, unsigned long tls) |
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{ |
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struct pt_regs *childregs = task_pt_regs(p); |
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struct pt_regs *regs; |
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struct switch_stack *stack; |
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struct switch_stack *childstack = |
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((struct switch_stack *)childregs) - 1; |
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if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { |
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memset(childstack, 0, |
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sizeof(struct switch_stack) + sizeof(struct pt_regs)); |
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childstack->r16 = usp; /* fn */ |
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childstack->r17 = arg; |
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childstack->ra = (unsigned long) ret_from_kernel_thread; |
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childregs->estatus = STATUS_PIE; |
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childregs->sp = (unsigned long) childstack; |
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p->thread.ksp = (unsigned long) childstack; |
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p->thread.kregs = childregs; |
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return 0; |
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} |
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regs = current_pt_regs(); |
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*childregs = *regs; |
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childregs->r2 = 0; /* Set the return value for the child. */ |
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childregs->r7 = 0; |
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stack = ((struct switch_stack *) regs) - 1; |
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*childstack = *stack; |
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childstack->ra = (unsigned long)ret_from_fork; |
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p->thread.kregs = childregs; |
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p->thread.ksp = (unsigned long) childstack; |
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if (usp) |
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childregs->sp = usp; |
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/* Initialize tls register. */ |
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if (clone_flags & CLONE_SETTLS) |
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childstack->r23 = tls; |
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return 0; |
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} |
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/* |
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* Generic dumping code. Used for panic and debug. |
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*/ |
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void dump(struct pt_regs *fp) |
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{ |
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unsigned long *sp; |
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unsigned char *tp; |
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int i; |
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pr_emerg("\nCURRENT PROCESS:\n\n"); |
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pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid); |
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if (current->mm) { |
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pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n", |
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(int) current->mm->start_code, |
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(int) current->mm->end_code, |
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(int) current->mm->start_data, |
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(int) current->mm->end_data, |
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(int) current->mm->end_data, |
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(int) current->mm->brk); |
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pr_emerg("USER-STACK=%08x KERNEL-STACK=%08x\n\n", |
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(int) current->mm->start_stack, |
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(int)(((unsigned long) current) + THREAD_SIZE)); |
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} |
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pr_emerg("PC: %08lx\n", fp->ea); |
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pr_emerg("SR: %08lx SP: %08lx\n", |
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(long) fp->estatus, (long) fp); |
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pr_emerg("r1: %08lx r2: %08lx r3: %08lx\n", |
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fp->r1, fp->r2, fp->r3); |
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pr_emerg("r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", |
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fp->r4, fp->r5, fp->r6, fp->r7); |
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pr_emerg("r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", |
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fp->r8, fp->r9, fp->r10, fp->r11); |
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pr_emerg("r12: %08lx r13: %08lx r14: %08lx r15: %08lx\n", |
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fp->r12, fp->r13, fp->r14, fp->r15); |
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pr_emerg("or2: %08lx ra: %08lx fp: %08lx sp: %08lx\n", |
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fp->orig_r2, fp->ra, fp->fp, fp->sp); |
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pr_emerg("\nUSP: %08x TRAPFRAME: %08x\n", |
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(unsigned int) fp->sp, (unsigned int) fp); |
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pr_emerg("\nCODE:"); |
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tp = ((unsigned char *) fp->ea) - 0x20; |
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for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) { |
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if ((i % 0x10) == 0) |
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pr_emerg("\n%08x: ", (int) (tp + i)); |
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pr_emerg("%08x ", (int) *sp++); |
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} |
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pr_emerg("\n"); |
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pr_emerg("\nKERNEL STACK:"); |
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tp = ((unsigned char *) fp) - 0x40; |
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for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) { |
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if ((i % 0x10) == 0) |
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pr_emerg("\n%08x: ", (int) (tp + i)); |
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pr_emerg("%08x ", (int) *sp++); |
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} |
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pr_emerg("\n"); |
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pr_emerg("\n"); |
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pr_emerg("\nUSER STACK:"); |
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tp = (unsigned char *) (fp->sp - 0x10); |
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for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) { |
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if ((i % 0x10) == 0) |
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pr_emerg("\n%08x: ", (int) (tp + i)); |
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pr_emerg("%08x ", (int) *sp++); |
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} |
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pr_emerg("\n\n"); |
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} |
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unsigned long get_wchan(struct task_struct *p) |
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{ |
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unsigned long fp, pc; |
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unsigned long stack_page; |
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int count = 0; |
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if (!p || p == current || p->state == TASK_RUNNING) |
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return 0; |
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stack_page = (unsigned long)p; |
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fp = ((struct switch_stack *)p->thread.ksp)->fp; /* ;dgt2 */ |
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do { |
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if (fp < stack_page+sizeof(struct task_struct) || |
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fp >= 8184+stack_page) /* ;dgt2;tmp */ |
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return 0; |
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pc = ((unsigned long *)fp)[1]; |
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if (!in_sched_functions(pc)) |
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return pc; |
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fp = *(unsigned long *) fp; |
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} while (count++ < 16); /* ;dgt2;tmp */ |
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return 0; |
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} |
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/* |
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* Do necessary setup to start up a newly executed thread. |
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* Will startup in user mode (status_extension = 0). |
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*/ |
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void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) |
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{ |
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memset((void *) regs, 0, sizeof(struct pt_regs)); |
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regs->estatus = ESTATUS_EPIE | ESTATUS_EU; |
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regs->ea = pc; |
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regs->sp = sp; |
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} |
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asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp, |
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int __user *parent_tidptr, int __user *child_tidptr, |
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unsigned long tls) |
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{ |
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struct kernel_clone_args args = { |
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.flags = (lower_32_bits(clone_flags) & ~CSIGNAL), |
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.pidfd = parent_tidptr, |
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.child_tid = child_tidptr, |
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.parent_tid = parent_tidptr, |
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.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL), |
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.stack = newsp, |
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.tls = tls, |
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}; |
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return kernel_clone(&args); |
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}
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