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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#include <linux/elfcore.h>
13
14#include <asm/elf.h>
15#include <abi/reg_ops.h>
16
17struct cpuinfo_csky cpu_data[NR_CPUS];
18
19#ifdef CONFIG_STACKPROTECTOR
20#include <linux/stackprotector.h>
21unsigned long __stack_chk_guard __read_mostly;
22EXPORT_SYMBOL(__stack_chk_guard);
23#endif
24
25asmlinkage void ret_from_fork(void);
26asmlinkage void ret_from_kernel_thread(void);
27
28/*
29 * Some archs flush debug and FPU info here
30 */
31void flush_thread(void){}
32
33int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
34{
35 unsigned long clone_flags = args->flags;
36 unsigned long usp = args->stack;
37 unsigned long tls = args->tls;
38 struct switch_stack *childstack;
39 struct pt_regs *childregs = task_pt_regs(p);
40
41#ifdef CONFIG_CPU_HAS_FPU
42 save_to_user_fp(&p->thread.user_fp);
43#endif
44
45 childstack = ((struct switch_stack *) childregs) - 1;
46 memset(childstack, 0, sizeof(struct switch_stack));
47
48 /* setup thread.sp for switch_to !!! */
49 p->thread.sp = (unsigned long)childstack;
50
51 if (unlikely(args->fn)) {
52 memset(childregs, 0, sizeof(struct pt_regs));
53 childstack->r15 = (unsigned long) ret_from_kernel_thread;
54 childstack->r10 = (unsigned long) args->fn_arg;
55 childstack->r9 = (unsigned long) args->fn;
56 childregs->sr = mfcr("psr");
57 } else {
58 *childregs = *(current_pt_regs());
59 if (usp)
60 childregs->usp = usp;
61 if (clone_flags & CLONE_SETTLS)
62 task_thread_info(p)->tp_value = childregs->tls
63 = tls;
64
65 childregs->a0 = 0;
66 childstack->r15 = (unsigned long) ret_from_fork;
67 }
68
69 return 0;
70}
71
72/* Fill in the fpu structure for a core dump. */
73int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
74{
75 memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
76 return 1;
77}
78
79int 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
90void 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
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
17struct cpuinfo_csky cpu_data[NR_CPUS];
18
19asmlinkage void ret_from_fork(void);
20asmlinkage void ret_from_kernel_thread(void);
21
22/*
23 * Some archs flush debug and FPU info here
24 */
25void flush_thread(void){}
26
27/*
28 * Return saved PC from a blocked thread
29 */
30unsigned long thread_saved_pc(struct task_struct *tsk)
31{
32 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
33
34 return sw->r15;
35}
36
37int copy_thread(unsigned long clone_flags,
38 unsigned long usp,
39 unsigned long kthread_arg,
40 struct task_struct *p)
41{
42 struct switch_stack *childstack;
43 struct pt_regs *childregs = task_pt_regs(p);
44
45#ifdef CONFIG_CPU_HAS_FPU
46 save_to_user_fp(&p->thread.user_fp);
47#endif
48
49 childstack = ((struct switch_stack *) childregs) - 1;
50 memset(childstack, 0, sizeof(struct switch_stack));
51
52 /* setup ksp for switch_to !!! */
53 p->thread.ksp = (unsigned long)childstack;
54
55 if (unlikely(p->flags & PF_KTHREAD)) {
56 memset(childregs, 0, sizeof(struct pt_regs));
57 childstack->r15 = (unsigned long) ret_from_kernel_thread;
58 childstack->r10 = kthread_arg;
59 childstack->r9 = usp;
60 childregs->sr = mfcr("psr");
61 } else {
62 *childregs = *(current_pt_regs());
63 if (usp)
64 childregs->usp = usp;
65 if (clone_flags & CLONE_SETTLS)
66 task_thread_info(p)->tp_value = childregs->tls
67 = childregs->regs[0];
68
69 childregs->a0 = 0;
70 childstack->r15 = (unsigned long) ret_from_fork;
71 }
72
73 return 0;
74}
75
76/* Fill in the fpu structure for a core dump. */
77int dump_fpu(struct pt_regs *regs, struct user_fp *fpu)
78{
79 memcpy(fpu, ¤t->thread.user_fp, sizeof(*fpu));
80 return 1;
81}
82EXPORT_SYMBOL(dump_fpu);
83
84int dump_task_regs(struct task_struct *tsk, elf_gregset_t *pr_regs)
85{
86 struct pt_regs *regs = task_pt_regs(tsk);
87
88 /* NOTE: usp is error value. */
89 ELF_CORE_COPY_REGS((*pr_regs), regs)
90
91 return 1;
92}
93
94unsigned long get_wchan(struct task_struct *p)
95{
96 unsigned long lr;
97 unsigned long *fp, *stack_start, *stack_end;
98 int count = 0;
99
100 if (!p || p == current || p->state == TASK_RUNNING)
101 return 0;
102
103 stack_start = (unsigned long *)end_of_stack(p);
104 stack_end = (unsigned long *)(task_stack_page(p) + THREAD_SIZE);
105
106 fp = (unsigned long *) thread_saved_fp(p);
107 do {
108 if (fp < stack_start || fp > stack_end)
109 return 0;
110#ifdef CONFIG_STACKTRACE
111 lr = fp[1];
112 fp = (unsigned long *)fp[0];
113#else
114 lr = *fp++;
115#endif
116 if (!in_sched_functions(lr) &&
117 __kernel_text_address(lr))
118 return lr;
119 } while (count++ < 16);
120
121 return 0;
122}
123EXPORT_SYMBOL(get_wchan);
124
125#ifndef CONFIG_CPU_PM_NONE
126void arch_cpu_idle(void)
127{
128#ifdef CONFIG_CPU_PM_WAIT
129 asm volatile("wait\n");
130#endif
131
132#ifdef CONFIG_CPU_PM_DOZE
133 asm volatile("doze\n");
134#endif
135
136#ifdef CONFIG_CPU_PM_STOP
137 asm volatile("stop\n");
138#endif
139 local_irq_enable();
140}
141#endif