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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
fe54616d YS |
2 | /* |
3 | * linux/arch/h8300/kernel/process.c | |
4 | * | |
5 | * Yoshinori Sato <ysato@users.sourceforge.jp> | |
6 | * | |
7 | * Based on: | |
8 | * | |
9 | * linux/arch/m68knommu/kernel/process.c | |
10 | * | |
11 | * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, | |
12 | * Kenneth Albanowski <kjahds@kjahds.com>, | |
13 | * The Silver Hammer Group, Ltd. | |
14 | * | |
15 | * linux/arch/m68k/kernel/process.c | |
16 | * | |
17 | * Copyright (C) 1995 Hamish Macdonald | |
18 | * | |
19 | * 68060 fixes by Jesper Skov | |
20 | */ | |
21 | ||
22 | /* | |
23 | * This file handles the architecture-dependent parts of process handling.. | |
24 | */ | |
25 | ||
26 | #include <linux/errno.h> | |
27 | #include <linux/module.h> | |
28 | #include <linux/sched.h> | |
b17b0153 | 29 | #include <linux/sched/debug.h> |
29930025 | 30 | #include <linux/sched/task.h> |
68db0cf1 | 31 | #include <linux/sched/task_stack.h> |
fe54616d YS |
32 | #include <linux/kernel.h> |
33 | #include <linux/mm.h> | |
34 | #include <linux/smp.h> | |
35 | #include <linux/stddef.h> | |
36 | #include <linux/unistd.h> | |
37 | #include <linux/ptrace.h> | |
38 | #include <linux/user.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/reboot.h> | |
41 | #include <linux/fs.h> | |
42 | #include <linux/slab.h> | |
43 | #include <linux/rcupdate.h> | |
44 | ||
7c0f6ba6 | 45 | #include <linux/uaccess.h> |
fe54616d YS |
46 | #include <asm/traps.h> |
47 | #include <asm/setup.h> | |
48 | #include <asm/pgtable.h> | |
49 | ||
50 | void (*pm_power_off)(void) = NULL; | |
51 | EXPORT_SYMBOL(pm_power_off); | |
52 | ||
53 | asmlinkage void ret_from_fork(void); | |
54 | asmlinkage void ret_from_kernel_thread(void); | |
55 | ||
56 | /* | |
57 | * The idle loop on an H8/300.. | |
58 | */ | |
59 | void arch_cpu_idle(void) | |
60 | { | |
61 | local_irq_enable(); | |
62 | __asm__("sleep"); | |
63 | } | |
64 | ||
65 | void machine_restart(char *__unused) | |
66 | { | |
67 | local_irq_disable(); | |
68 | __asm__("jmp @@0"); | |
69 | } | |
70 | ||
71 | void machine_halt(void) | |
72 | { | |
73 | local_irq_disable(); | |
74 | __asm__("sleep"); | |
75 | for (;;) | |
76 | ; | |
77 | } | |
78 | ||
79 | void machine_power_off(void) | |
80 | { | |
81 | local_irq_disable(); | |
82 | __asm__("sleep"); | |
83 | for (;;) | |
84 | ; | |
85 | } | |
86 | ||
87 | void show_regs(struct pt_regs *regs) | |
88 | { | |
89 | show_regs_print_info(KERN_DEFAULT); | |
90 | ||
91 | pr_notice("\n"); | |
92 | pr_notice("PC: %08lx Status: %02x\n", | |
93 | regs->pc, regs->ccr); | |
94 | pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n", | |
95 | regs->orig_er0, regs->er0, regs->er1); | |
96 | pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n", | |
97 | regs->er2, regs->er3, regs->er4, regs->er5); | |
98 | pr_notice("ER6' %08lx ", regs->er6); | |
99 | if (user_mode(regs)) | |
100 | printk("USP: %08lx\n", rdusp()); | |
101 | else | |
102 | printk("\n"); | |
103 | } | |
104 | ||
105 | void flush_thread(void) | |
106 | { | |
107 | } | |
108 | ||
109 | int copy_thread(unsigned long clone_flags, | |
110 | unsigned long usp, unsigned long topstk, | |
111 | struct task_struct *p) | |
112 | { | |
113 | struct pt_regs *childregs; | |
114 | ||
115 | childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; | |
116 | ||
117 | if (unlikely(p->flags & PF_KTHREAD)) { | |
118 | memset(childregs, 0, sizeof(struct pt_regs)); | |
119 | childregs->retpc = (unsigned long) ret_from_kernel_thread; | |
120 | childregs->er4 = topstk; /* arg */ | |
121 | childregs->er5 = usp; /* fn */ | |
122 | } else { | |
123 | *childregs = *current_pt_regs(); | |
124 | childregs->er0 = 0; | |
125 | childregs->retpc = (unsigned long) ret_from_fork; | |
126 | p->thread.usp = usp ?: rdusp(); | |
127 | } | |
128 | p->thread.ksp = (unsigned long)childregs; | |
129 | ||
130 | return 0; | |
131 | } | |
132 | ||
fe54616d YS |
133 | unsigned long get_wchan(struct task_struct *p) |
134 | { | |
135 | unsigned long fp, pc; | |
136 | unsigned long stack_page; | |
137 | int count = 0; | |
138 | ||
139 | if (!p || p == current || p->state == TASK_RUNNING) | |
140 | return 0; | |
141 | ||
142 | stack_page = (unsigned long)p; | |
143 | fp = ((struct pt_regs *)p->thread.ksp)->er6; | |
144 | do { | |
145 | if (fp < stack_page+sizeof(struct thread_info) || | |
146 | fp >= 8184+stack_page) | |
147 | return 0; | |
148 | pc = ((unsigned long *)fp)[1]; | |
149 | if (!in_sched_functions(pc)) | |
150 | return pc; | |
151 | fp = *(unsigned long *) fp; | |
152 | } while (count++ < 16); | |
153 | return 0; | |
154 | } | |
155 | ||
156 | /* generic sys_clone is not enough registers */ | |
157 | asmlinkage int sys_clone(unsigned long __user *args) | |
158 | { | |
159 | unsigned long clone_flags; | |
160 | unsigned long newsp; | |
161 | uintptr_t parent_tidptr; | |
162 | uintptr_t child_tidptr; | |
163 | ||
164 | get_user(clone_flags, &args[0]); | |
165 | get_user(newsp, &args[1]); | |
166 | get_user(parent_tidptr, &args[2]); | |
167 | get_user(child_tidptr, &args[3]); | |
168 | return do_fork(clone_flags, newsp, 0, | |
169 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
170 | } |