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fe54616d YS |
1 | /* |
2 | * linux/arch/h8300/kernel/process.c | |
3 | * | |
4 | * Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | * | |
6 | * Based on: | |
7 | * | |
8 | * linux/arch/m68knommu/kernel/process.c | |
9 | * | |
10 | * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, | |
11 | * Kenneth Albanowski <kjahds@kjahds.com>, | |
12 | * The Silver Hammer Group, Ltd. | |
13 | * | |
14 | * linux/arch/m68k/kernel/process.c | |
15 | * | |
16 | * Copyright (C) 1995 Hamish Macdonald | |
17 | * | |
18 | * 68060 fixes by Jesper Skov | |
19 | */ | |
20 | ||
21 | /* | |
22 | * This file handles the architecture-dependent parts of process handling.. | |
23 | */ | |
24 | ||
25 | #include <linux/errno.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/sched.h> | |
b17b0153 | 28 | #include <linux/sched/debug.h> |
fe54616d YS |
29 | #include <linux/kernel.h> |
30 | #include <linux/mm.h> | |
31 | #include <linux/smp.h> | |
32 | #include <linux/stddef.h> | |
33 | #include <linux/unistd.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/user.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/reboot.h> | |
38 | #include <linux/fs.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/rcupdate.h> | |
41 | ||
7c0f6ba6 | 42 | #include <linux/uaccess.h> |
fe54616d YS |
43 | #include <asm/traps.h> |
44 | #include <asm/setup.h> | |
45 | #include <asm/pgtable.h> | |
46 | ||
47 | void (*pm_power_off)(void) = NULL; | |
48 | EXPORT_SYMBOL(pm_power_off); | |
49 | ||
50 | asmlinkage void ret_from_fork(void); | |
51 | asmlinkage void ret_from_kernel_thread(void); | |
52 | ||
53 | /* | |
54 | * The idle loop on an H8/300.. | |
55 | */ | |
56 | void arch_cpu_idle(void) | |
57 | { | |
58 | local_irq_enable(); | |
59 | __asm__("sleep"); | |
60 | } | |
61 | ||
62 | void machine_restart(char *__unused) | |
63 | { | |
64 | local_irq_disable(); | |
65 | __asm__("jmp @@0"); | |
66 | } | |
67 | ||
68 | void machine_halt(void) | |
69 | { | |
70 | local_irq_disable(); | |
71 | __asm__("sleep"); | |
72 | for (;;) | |
73 | ; | |
74 | } | |
75 | ||
76 | void machine_power_off(void) | |
77 | { | |
78 | local_irq_disable(); | |
79 | __asm__("sleep"); | |
80 | for (;;) | |
81 | ; | |
82 | } | |
83 | ||
84 | void show_regs(struct pt_regs *regs) | |
85 | { | |
86 | show_regs_print_info(KERN_DEFAULT); | |
87 | ||
88 | pr_notice("\n"); | |
89 | pr_notice("PC: %08lx Status: %02x\n", | |
90 | regs->pc, regs->ccr); | |
91 | pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n", | |
92 | regs->orig_er0, regs->er0, regs->er1); | |
93 | pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n", | |
94 | regs->er2, regs->er3, regs->er4, regs->er5); | |
95 | pr_notice("ER6' %08lx ", regs->er6); | |
96 | if (user_mode(regs)) | |
97 | printk("USP: %08lx\n", rdusp()); | |
98 | else | |
99 | printk("\n"); | |
100 | } | |
101 | ||
102 | void flush_thread(void) | |
103 | { | |
104 | } | |
105 | ||
106 | int copy_thread(unsigned long clone_flags, | |
107 | unsigned long usp, unsigned long topstk, | |
108 | struct task_struct *p) | |
109 | { | |
110 | struct pt_regs *childregs; | |
111 | ||
112 | childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; | |
113 | ||
114 | if (unlikely(p->flags & PF_KTHREAD)) { | |
115 | memset(childregs, 0, sizeof(struct pt_regs)); | |
116 | childregs->retpc = (unsigned long) ret_from_kernel_thread; | |
117 | childregs->er4 = topstk; /* arg */ | |
118 | childregs->er5 = usp; /* fn */ | |
119 | } else { | |
120 | *childregs = *current_pt_regs(); | |
121 | childregs->er0 = 0; | |
122 | childregs->retpc = (unsigned long) ret_from_fork; | |
123 | p->thread.usp = usp ?: rdusp(); | |
124 | } | |
125 | p->thread.ksp = (unsigned long)childregs; | |
126 | ||
127 | return 0; | |
128 | } | |
129 | ||
130 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
131 | { | |
132 | return ((struct pt_regs *)tsk->thread.esp0)->pc; | |
133 | } | |
134 | ||
135 | unsigned long get_wchan(struct task_struct *p) | |
136 | { | |
137 | unsigned long fp, pc; | |
138 | unsigned long stack_page; | |
139 | int count = 0; | |
140 | ||
141 | if (!p || p == current || p->state == TASK_RUNNING) | |
142 | return 0; | |
143 | ||
144 | stack_page = (unsigned long)p; | |
145 | fp = ((struct pt_regs *)p->thread.ksp)->er6; | |
146 | do { | |
147 | if (fp < stack_page+sizeof(struct thread_info) || | |
148 | fp >= 8184+stack_page) | |
149 | return 0; | |
150 | pc = ((unsigned long *)fp)[1]; | |
151 | if (!in_sched_functions(pc)) | |
152 | return pc; | |
153 | fp = *(unsigned long *) fp; | |
154 | } while (count++ < 16); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* generic sys_clone is not enough registers */ | |
159 | asmlinkage int sys_clone(unsigned long __user *args) | |
160 | { | |
161 | unsigned long clone_flags; | |
162 | unsigned long newsp; | |
163 | uintptr_t parent_tidptr; | |
164 | uintptr_t child_tidptr; | |
165 | ||
166 | get_user(clone_flags, &args[0]); | |
167 | get_user(newsp, &args[1]); | |
168 | get_user(parent_tidptr, &args[2]); | |
169 | get_user(child_tidptr, &args[3]); | |
170 | return do_fork(clone_flags, newsp, 0, | |
171 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
172 | } |