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 | |
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(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. */ |
73 | int 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 | |
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 | } |
104 | #endif |
105 | |