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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> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/mm.h> | |
30 | #include <linux/smp.h> | |
31 | #include <linux/stddef.h> | |
32 | #include <linux/unistd.h> | |
33 | #include <linux/ptrace.h> | |
34 | #include <linux/user.h> | |
35 | #include <linux/interrupt.h> | |
36 | #include <linux/reboot.h> | |
37 | #include <linux/fs.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/rcupdate.h> | |
40 | ||
41 | #include <asm/uaccess.h> | |
42 | #include <asm/traps.h> | |
43 | #include <asm/setup.h> | |
44 | #include <asm/pgtable.h> | |
45 | ||
46 | void (*pm_power_off)(void) = NULL; | |
47 | EXPORT_SYMBOL(pm_power_off); | |
48 | ||
49 | asmlinkage void ret_from_fork(void); | |
50 | asmlinkage void ret_from_kernel_thread(void); | |
51 | ||
52 | /* | |
53 | * The idle loop on an H8/300.. | |
54 | */ | |
55 | void arch_cpu_idle(void) | |
56 | { | |
57 | local_irq_enable(); | |
58 | __asm__("sleep"); | |
59 | } | |
60 | ||
61 | void machine_restart(char *__unused) | |
62 | { | |
63 | local_irq_disable(); | |
64 | __asm__("jmp @@0"); | |
65 | } | |
66 | ||
67 | void machine_halt(void) | |
68 | { | |
69 | local_irq_disable(); | |
70 | __asm__("sleep"); | |
71 | for (;;) | |
72 | ; | |
73 | } | |
74 | ||
75 | void machine_power_off(void) | |
76 | { | |
77 | local_irq_disable(); | |
78 | __asm__("sleep"); | |
79 | for (;;) | |
80 | ; | |
81 | } | |
82 | ||
83 | void show_regs(struct pt_regs *regs) | |
84 | { | |
85 | show_regs_print_info(KERN_DEFAULT); | |
86 | ||
87 | pr_notice("\n"); | |
88 | pr_notice("PC: %08lx Status: %02x\n", | |
89 | regs->pc, regs->ccr); | |
90 | pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n", | |
91 | regs->orig_er0, regs->er0, regs->er1); | |
92 | pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n", | |
93 | regs->er2, regs->er3, regs->er4, regs->er5); | |
94 | pr_notice("ER6' %08lx ", regs->er6); | |
95 | if (user_mode(regs)) | |
96 | printk("USP: %08lx\n", rdusp()); | |
97 | else | |
98 | printk("\n"); | |
99 | } | |
100 | ||
101 | void flush_thread(void) | |
102 | { | |
103 | } | |
104 | ||
105 | int copy_thread(unsigned long clone_flags, | |
106 | unsigned long usp, unsigned long topstk, | |
107 | struct task_struct *p) | |
108 | { | |
109 | struct pt_regs *childregs; | |
110 | ||
111 | childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; | |
112 | ||
113 | if (unlikely(p->flags & PF_KTHREAD)) { | |
114 | memset(childregs, 0, sizeof(struct pt_regs)); | |
115 | childregs->retpc = (unsigned long) ret_from_kernel_thread; | |
116 | childregs->er4 = topstk; /* arg */ | |
117 | childregs->er5 = usp; /* fn */ | |
118 | } else { | |
119 | *childregs = *current_pt_regs(); | |
120 | childregs->er0 = 0; | |
121 | childregs->retpc = (unsigned long) ret_from_fork; | |
122 | p->thread.usp = usp ?: rdusp(); | |
123 | } | |
124 | p->thread.ksp = (unsigned long)childregs; | |
125 | ||
126 | return 0; | |
127 | } | |
128 | ||
129 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
130 | { | |
131 | return ((struct pt_regs *)tsk->thread.esp0)->pc; | |
132 | } | |
133 | ||
134 | unsigned long get_wchan(struct task_struct *p) | |
135 | { | |
136 | unsigned long fp, pc; | |
137 | unsigned long stack_page; | |
138 | int count = 0; | |
139 | ||
140 | if (!p || p == current || p->state == TASK_RUNNING) | |
141 | return 0; | |
142 | ||
143 | stack_page = (unsigned long)p; | |
144 | fp = ((struct pt_regs *)p->thread.ksp)->er6; | |
145 | do { | |
146 | if (fp < stack_page+sizeof(struct thread_info) || | |
147 | fp >= 8184+stack_page) | |
148 | return 0; | |
149 | pc = ((unsigned long *)fp)[1]; | |
150 | if (!in_sched_functions(pc)) | |
151 | return pc; | |
152 | fp = *(unsigned long *) fp; | |
153 | } while (count++ < 16); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | /* generic sys_clone is not enough registers */ | |
158 | asmlinkage int sys_clone(unsigned long __user *args) | |
159 | { | |
160 | unsigned long clone_flags; | |
161 | unsigned long newsp; | |
162 | uintptr_t parent_tidptr; | |
163 | uintptr_t child_tidptr; | |
164 | ||
165 | get_user(clone_flags, &args[0]); | |
166 | get_user(newsp, &args[1]); | |
167 | get_user(parent_tidptr, &args[2]); | |
168 | get_user(child_tidptr, &args[3]); | |
169 | return do_fork(clone_flags, newsp, 0, | |
170 | (int __user *)parent_tidptr, (int __user *)child_tidptr); | |
171 | } |