/* * Architecture-dependent parts of process handling. * * Copyright (C) 2013 Altera Corporation * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch> * Copyright (C) 2009 Wind River Systems Inc *   Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com * Copyright (C) 2004 Microtronix Datacom Ltd * * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. */ #include <linux/export.h>#include <linux/sched.h>#include <linux/sched/debug.h>#include <linux/sched/task.h>#include <linux/sched/task_stack.h>#include <linux/mm_types.h>#include <linux/tick.h>#include <linux/uaccess.h> #include <asm/unistd.h>#include <asm/traps.h>#include <asm/cpuinfo.h> asmlinkage void ret_from_fork(void);asmlinkage void ret_from_kernel_thread(void); void (*pm_power_off)(void) = NULL;EXPORT_SYMBOL(pm_power_off); void arch_cpu_idle(void){} /* * The development boards have no way to pull a board reset. Just jump to the * cpu reset address and let the boot loader or the code in head.S take care of * resetting peripherals. */void machine_restart(char *__unused){	pr_notice("Machine restart (%08x)...\n", cpuinfo.reset_addr);	local_irq_disable();	__asm__ __volatile__ (	"jmp	%0\n\t"	:	: "r" (cpuinfo.reset_addr)	: "r4");} void machine_halt(void){	pr_notice("Machine halt...\n");	local_irq_disable();	for (;;)		;} /* * There is no way to power off the development boards. So just spin for now. If * we ever have a way of resetting a board using a GPIO we should add that here. */void machine_power_off(void){	pr_notice("Machine power off...\n");	local_irq_disable();	for (;;)		;} void show_regs(struct pt_regs *regs){	pr_notice("\n");	show_regs_print_info(KERN_DEFAULT); 	pr_notice("r1: %08lx r2: %08lx r3: %08lx r4: %08lx\n",		regs->r1,  regs->r2,  regs->r3,  regs->r4); 	pr_notice("r5: %08lx r6: %08lx r7: %08lx r8: %08lx\n",		regs->r5,  regs->r6,  regs->r7,  regs->r8); 	pr_notice("r9: %08lx r10: %08lx r11: %08lx r12: %08lx\n",		regs->r9,  regs->r10, regs->r11, regs->r12); 	pr_notice("r13: %08lx r14: %08lx r15: %08lx\n",		regs->r13, regs->r14, regs->r15); 	pr_notice("ra: %08lx fp:  %08lx sp: %08lx gp: %08lx\n",		regs->ra,  regs->fp,  regs->sp,  regs->gp); 	pr_notice("ea: %08lx estatus: %08lx\n",		regs->ea,  regs->estatus);} void flush_thread(void){} int copy_thread(struct task_struct *p, const struct kernel_clone_args *args){	u64 clone_flags = args->flags;	unsigned long usp = args->stack;	unsigned long tls = args->tls;	struct pt_regs *childregs = task_pt_regs(p);	struct pt_regs *regs;	struct switch_stack *stack;	struct switch_stack *childstack =		((struct switch_stack *)childregs) - 1; 	if (unlikely(args->fn)) {		memset(childstack, 0,			sizeof(struct switch_stack) + sizeof(struct pt_regs)); 		childstack->r16 = (unsigned long) args->fn;		childstack->r17 = (unsigned long) args->fn_arg;		childstack->ra = (unsigned long) ret_from_kernel_thread;		childregs->estatus = STATUS_PIE;		childregs->sp = (unsigned long) childstack; 		p->thread.ksp = (unsigned long) childstack;		p->thread.kregs = childregs;		return 0;	} 	regs = current_pt_regs();	*childregs = *regs;	childregs->r2 = 0;	/* Set the return value for the child. */	childregs->r7 = 0; 	stack = ((struct switch_stack *) regs) - 1;	*childstack = *stack;	childstack->ra = (unsigned long)ret_from_fork;	p->thread.kregs = childregs;	p->thread.ksp = (unsigned long) childstack; 	if (usp)		childregs->sp = usp; 	/* Initialize tls register. */	if (clone_flags & CLONE_SETTLS)		childstack->r23 = tls; 	return 0;} /* *	Generic dumping code. Used for panic and debug. */void dump(struct pt_regs *fp){	unsigned long	*sp;	unsigned char	*tp;	int		i; 	pr_emerg("\nCURRENT PROCESS:\n\n");	pr_emerg("COMM=%s PID=%d\n", current->comm, current->pid); 	if (current->mm) {		pr_emerg("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",			(int) current->mm->start_code,			(int) current->mm->end_code,			(int) current->mm->start_data,			(int) current->mm->end_data,			(int) current->mm->end_data,			(int) current->mm->brk);		pr_emerg("USER-STACK=%08x  KERNEL-STACK=%08x\n\n",			(int) current->mm->start_stack,			(int)(((unsigned long) current) + THREAD_SIZE));	} 	pr_emerg("PC: %08lx\n", fp->ea);	pr_emerg("SR: %08lx    SP: %08lx\n",		(long) fp->estatus, (long) fp); 	pr_emerg("r1: %08lx    r2: %08lx    r3: %08lx\n",		fp->r1, fp->r2, fp->r3); 	pr_emerg("r4: %08lx    r5: %08lx    r6: %08lx    r7: %08lx\n",		fp->r4, fp->r5, fp->r6, fp->r7);	pr_emerg("r8: %08lx    r9: %08lx    r10: %08lx    r11: %08lx\n",		fp->r8, fp->r9, fp->r10, fp->r11);	pr_emerg("r12: %08lx  r13: %08lx    r14: %08lx    r15: %08lx\n",		fp->r12, fp->r13, fp->r14, fp->r15);	pr_emerg("or2: %08lx   ra: %08lx     fp: %08lx    sp: %08lx\n",		fp->orig_r2, fp->ra, fp->fp, fp->sp);	pr_emerg("\nUSP: %08x   TRAPFRAME: %08x\n",		(unsigned int) fp->sp, (unsigned int) fp); 	pr_emerg("\nCODE:");	tp = ((unsigned char *) fp->ea) - 0x20;	for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {		if ((i % 0x10) == 0)			pr_emerg("\n%08x: ", (int) (tp + i));		pr_emerg("%08x ", (int) *sp++);	}	pr_emerg("\n"); 	pr_emerg("\nKERNEL STACK:");	tp = ((unsigned char *) fp) - 0x40;	for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {		if ((i % 0x10) == 0)			pr_emerg("\n%08x: ", (int) (tp + i));		pr_emerg("%08x ", (int) *sp++);	}	pr_emerg("\n");	pr_emerg("\n"); 	pr_emerg("\nUSER STACK:");	tp = (unsigned char *) (fp->sp - 0x10);	for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {		if ((i % 0x10) == 0)			pr_emerg("\n%08x: ", (int) (tp + i));		pr_emerg("%08x ", (int) *sp++);	}	pr_emerg("\n\n");} unsigned long __get_wchan(struct task_struct *p){	unsigned long fp, pc;	unsigned long stack_page;	int count = 0; 	stack_page = (unsigned long)p;	fp = ((struct switch_stack *)p->thread.ksp)->fp;	/* ;dgt2 */	do {		if (fp < stack_page+sizeof(struct task_struct) ||			fp >= 8184+stack_page)	/* ;dgt2;tmp */			return 0;		pc = ((unsigned long *)fp)[1];		if (!in_sched_functions(pc))			return pc;		fp = *(unsigned long *) fp;	} while (count++ < 16);		/* ;dgt2;tmp */	return 0;} /* * Do necessary setup to start up a newly executed thread. * Will startup in user mode (status_extension = 0). */void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp){	memset((void *) regs, 0, sizeof(struct pt_regs));	regs->estatus = ESTATUS_EPIE | ESTATUS_EU;	regs->ea = pc;	regs->sp = sp;} asmlinkage int nios2_clone(unsigned long clone_flags, unsigned long newsp,			   int __user *parent_tidptr, int __user *child_tidptr,			   unsigned long tls){	struct kernel_clone_args args = {		.flags		= (lower_32_bits(clone_flags) & ~CSIGNAL),		.pidfd		= parent_tidptr,		.child_tid	= child_tidptr,		.parent_tid	= parent_tidptr,		.exit_signal	= (lower_32_bits(clone_flags) & CSIGNAL),		.stack		= newsp,		.tls		= tls,	}; 	return kernel_clone(&args);}