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 */
flush_thread(void)31 void flush_thread(void){}
32
copy_thread(unsigned long clone_flags,unsigned long usp,unsigned long kthread_arg,struct task_struct * p,unsigned long tls)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. */
dump_fpu(struct pt_regs * regs,struct user_fp * fpu)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
dump_task_regs(struct task_struct * tsk,elf_gregset_t * pr_regs)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
arch_cpu_idle(void)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