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