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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105// 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, ¤t->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