// SPDX-License-Identifier: GPL-2.0// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include <linux/module.h>#include <linux/sched.h>#include <linux/sched/task_stack.h>#include <linux/sched/debug.h>#include <linux/delay.h>#include <linux/kallsyms.h>#include <linux/uaccess.h>#include <linux/ptrace.h>#include <linux/elfcore.h> #include <asm/elf.h>#include <abi/reg_ops.h> struct cpuinfo_csky cpu_data[NR_CPUS]; #ifdef CONFIG_STACKPROTECTOR#include <linux/stackprotector.h>unsigned long __stack_chk_guard __read_mostly;EXPORT_SYMBOL(__stack_chk_guard);#endif asmlinkage void ret_from_fork(void);asmlinkage void ret_from_kernel_thread(void); /* * Some archs flush debug and FPU info here */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 switch_stack *childstack;	struct pt_regs *childregs = task_pt_regs(p); #ifdef CONFIG_CPU_HAS_FPU	save_to_user_fp(&p->thread.user_fp);#endif 	childstack = ((struct switch_stack *) childregs) - 1;	memset(childstack, 0, sizeof(struct switch_stack)); 	/* setup thread.sp for switch_to !!! */	p->thread.sp = (unsigned long)childstack; 	if (unlikely(args->fn)) {		memset(childregs, 0, sizeof(struct pt_regs));		childstack->r15 = (unsigned long) ret_from_kernel_thread;		childstack->r10 = (unsigned long) args->fn_arg;		childstack->r9 = (unsigned long) args->fn;		childregs->sr = mfcr("psr");	} else {		*childregs = *(current_pt_regs());		if (usp)			childregs->usp = usp;		if (clone_flags & CLONE_SETTLS)			task_thread_info(p)->tp_value = childregs->tls						      = tls; 		childregs->a0 = 0;		childstack->r15 = (unsigned long) ret_from_fork;	} 	return 0;} /* Fill in the fpu structure for a core dump.  */int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu){	memcpy(fpu, &current->thread.user_fp, sizeof(*fpu));	return 1;} int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs){	struct pt_regs *regs = task_pt_regs(tsk); 	/* NOTE: usp is error value. */	ELF_CORE_COPY_REGS((*pr_regs), regs) 	return 1;} #ifndef CONFIG_CPU_PM_NONEvoid arch_cpu_idle(void){#ifdef CONFIG_CPU_PM_WAIT	asm volatile("wait\n");#endif #ifdef CONFIG_CPU_PM_DOZE	asm volatile("doze\n");#endif #ifdef CONFIG_CPU_PM_STOP	asm volatile("stop\n");#endif}#endif