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+/*
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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 <tklauser@distanz.ch>
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+ * Copyright (C) 2009 Wind River Systems Inc
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+ * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
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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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+
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+#include <linux/export.h>
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+#include <linux/sched.h>
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+#include <linux/tick.h>
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+#include <linux/uaccess.h>
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+
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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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+
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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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+
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+void (*pm_power_off)(void) = NULL;
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+EXPORT_SYMBOL(pm_power_off);
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+
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+void arch_cpu_idle(void)
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+{
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+ local_irq_enable();
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+}
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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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+
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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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+/*
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+void flush_thread(void)
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+{
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+ set_fs(USER_DS);
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+}
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+
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+int copy_thread(unsigned long clone_flags,
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+ unsigned long usp, unsigned long arg, struct task_struct *p)
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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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+
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+ if (unlikely(p->flags & PF_KTHREAD)) {
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+ memset(childstack, 0,
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+ sizeof(struct switch_stack) + sizeof(struct pt_regs));
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+
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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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+
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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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+
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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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+
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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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+
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+ if (usp)
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+ childregs->sp = usp;
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+
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+ /* Initialize tls register. */
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+ if (clone_flags & CLONE_SETTLS)
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+ childstack->r23 = regs->r8;
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ if (!p || p == current || p->state == TASK_RUNNING)
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+ return 0;
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+
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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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+/*
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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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+
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+#include <linux/elfcore.h>
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+
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+/* Fill in the FPU structure for a core dump. */
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+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
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+{
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+ return 0; /* Nios2 has no FPU and thus no FPU registers */
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+}
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Ley Foon Tan