1// SPDX-License-Identifier: GPL-2.0
  2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
  3
  4#include <linux/module.h>
  5#include <linux/version.h>
  6#include <linux/sched.h>
  7#include <linux/sched/task_stack.h>
  8#include <linux/sched/debug.h>
  9#include <linux/delay.h>
 10#include <linux/kallsyms.h>
 11#include <linux/uaccess.h>
 12#include <linux/ptrace.h>
 13
 14#include <asm/elf.h>
 15#include <abi/reg_ops.h>
 16
 17struct cpuinfo_csky cpu_data[NR_CPUS];
 18
 19#ifdef CONFIG_STACKPROTECTOR
 20#include <linux/stackprotector.h>
 21unsigned long __stack_chk_guard __read_mostly;
 22EXPORT_SYMBOL(__stack_chk_guard);
 23#endif
 24
 25asmlinkage void ret_from_fork(void);
 26asmlinkage void ret_from_kernel_thread(void);
 27
 28/*
 29 * Some archs flush debug and FPU info here
 30 */
 31void flush_thread(void){}
 32
 33int copy_thread(unsigned long clone_flags,
 34		unsigned long usp,
 35		unsigned long kthread_arg,
 36		struct task_struct *p,
 37		unsigned long tls)
 38{
 39	struct switch_stack *childstack;
 40	struct pt_regs *childregs = task_pt_regs(p);
 41
 42#ifdef CONFIG_CPU_HAS_FPU
 43	save_to_user_fp(&p->thread.user_fp);
 44#endif
 45
 46	childstack = ((struct switch_stack *) childregs) - 1;
 47	memset(childstack, 0, sizeof(struct switch_stack));
 48
 49	/* setup thread.sp for switch_to !!! */
 50	p->thread.sp = (unsigned long)childstack;
 51
 52	if (unlikely(p->flags & PF_KTHREAD)) {
 53		memset(childregs, 0, sizeof(struct pt_regs));
 54		childstack->r15 = (unsigned long) ret_from_kernel_thread;
 55		childstack->r10 = kthread_arg;
 56		childstack->r9 = usp;
 57		childregs->sr = mfcr("psr");
 58	} else {
 59		*childregs = *(current_pt_regs());
 60		if (usp)
 61			childregs->usp = usp;
 62		if (clone_flags & CLONE_SETTLS)
 63			task_thread_info(p)->tp_value = childregs->tls
 64						      = tls;
 65
 66		childregs->a0 = 0;
 67		childstack->r15 = (unsigned long) ret_from_fork;
 68	}
 69
 70	return 0;
 71}
 72
 73/* Fill in the fpu structure for a core dump.  */
 74int dump_fpu(struct pt_regs *regs, struct user_fp *fpu)
 75{
 76	memcpy(fpu, &current->thread.user_fp, sizeof(*fpu));
 77	return 1;
 78}
 79EXPORT_SYMBOL(dump_fpu);
 80
 81int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
 82{
 83	struct pt_regs *regs = task_pt_regs(tsk);
 84
 85	/* NOTE: usp is error value. */
 86	ELF_CORE_COPY_REGS((*pr_regs), regs)
 87
 88	return 1;
 89}
 90
 91#ifndef CONFIG_CPU_PM_NONE
 92void arch_cpu_idle(void)
 93{
 94#ifdef CONFIG_CPU_PM_WAIT
 95	asm volatile("wait\n");
 96#endif
 97
 98#ifdef CONFIG_CPU_PM_DOZE
 99	asm volatile("doze\n");
100#endif
101
102#ifdef CONFIG_CPU_PM_STOP
103	asm volatile("stop\n");
104#endif
105	local_irq_enable();
106}
107#endif