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 17 struct cpuinfo_csky cpu_data[NR_CPUS]; 18 19 #ifdef CONFIG_STACKPROTECTOR 20 #include <linux/stackprotector.h> 21 unsigned long __stack_chk_guard __read_mostly; 22 EXPORT_SYMBOL(__stack_chk_guard); 23 #endif 24 25 asmlinkage void ret_from_fork(void); 26 asmlinkage void ret_from_kernel_thread(void); 27 28 /* 29 * Some archs flush debug and FPU info here 30 */ 31 void flush_thread(void){} 32 33 int 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 | PF_IO_WORKER))) { 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. */ 74 int dump_fpu(struct pt_regs *regs, struct user_fp *fpu) 75 { 76 memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu)); 77 return 1; 78 } 79 EXPORT_SYMBOL(dump_fpu); 80 81 int 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 92 void 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 raw_local_irq_enable(); 106 } 107 #endif 108