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- // 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 <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)
- {
- unsigned long 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 dump_fpu(struct pt_regs *regs, struct user_fp *fpu)
- {
- memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
- return 1;
- }
- EXPORT_SYMBOL(dump_fpu);
- 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_NONE
- void 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
- raw_local_irq_enable();
- }
- #endif
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