Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
1da177e4 LT |
31 | #include <linux/stddef.h> |
32 | #include <linux/unistd.h> | |
33 | #include <linux/ptrace.h> | |
1da177e4 | 34 | #include <linux/user.h> |
1da177e4 LT |
35 | #include <linux/interrupt.h> |
36 | #include <linux/reboot.h> | |
0cd82ef1 | 37 | #include <linux/fs.h> |
5a0e3ad6 | 38 | #include <linux/slab.h> |
1da177e4 LT |
39 | |
40 | #include <asm/uaccess.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/traps.h> | |
43 | #include <asm/setup.h> | |
44 | #include <asm/pgtable.h> | |
45 | ||
47f3fc94 AB |
46 | void (*pm_power_off)(void) = NULL; |
47 | EXPORT_SYMBOL(pm_power_off); | |
48 | ||
1da177e4 LT |
49 | asmlinkage void ret_from_fork(void); |
50 | ||
51 | /* | |
52 | * The idle loop on an H8/300.. | |
53 | */ | |
54 | #if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM) | |
cdb04527 | 55 | static void default_idle(void) |
1da177e4 | 56 | { |
5bfb5d69 NP |
57 | local_irq_disable(); |
58 | if (!need_resched()) { | |
59 | local_irq_enable(); | |
60 | /* XXX: race here! What if need_resched() gets set now? */ | |
61 | __asm__("sleep"); | |
62 | } else | |
63 | local_irq_enable(); | |
1da177e4 LT |
64 | } |
65 | #else | |
cdb04527 | 66 | static void default_idle(void) |
1da177e4 | 67 | { |
5bfb5d69 | 68 | cpu_relax(); |
1da177e4 LT |
69 | } |
70 | #endif | |
71 | void (*idle)(void) = default_idle; | |
72 | ||
73 | /* | |
74 | * The idle thread. There's no useful work to be | |
75 | * done, so just try to conserve power and have a | |
76 | * low exit latency (ie sit in a loop waiting for | |
77 | * somebody to say that they'd like to reschedule) | |
78 | */ | |
79 | void cpu_idle(void) | |
80 | { | |
5bfb5d69 NP |
81 | while (1) { |
82 | while (!need_resched()) | |
83 | idle(); | |
bd2f5536 | 84 | schedule_preempt_disabled(); |
5bfb5d69 | 85 | } |
1da177e4 LT |
86 | } |
87 | ||
88 | void machine_restart(char * __unused) | |
89 | { | |
90 | local_irq_disable(); | |
91 | __asm__("jmp @@0"); | |
92 | } | |
93 | ||
1da177e4 LT |
94 | void machine_halt(void) |
95 | { | |
96 | local_irq_disable(); | |
97 | __asm__("sleep"); | |
98 | for (;;); | |
99 | } | |
100 | ||
1da177e4 LT |
101 | void machine_power_off(void) |
102 | { | |
103 | local_irq_disable(); | |
104 | __asm__("sleep"); | |
105 | for (;;); | |
106 | } | |
107 | ||
1da177e4 LT |
108 | void show_regs(struct pt_regs * regs) |
109 | { | |
110 | printk("\nPC: %08lx Status: %02x", | |
111 | regs->pc, regs->ccr); | |
112 | printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx", | |
113 | regs->orig_er0, regs->er0, regs->er1); | |
114 | printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx", | |
115 | regs->er2, regs->er3, regs->er4, regs->er5); | |
116 | printk("\nER6' %08lx ",regs->er6); | |
117 | if (user_mode(regs)) | |
118 | printk("USP: %08lx\n", rdusp()); | |
119 | else | |
120 | printk("\n"); | |
121 | } | |
122 | ||
123 | /* | |
124 | * Create a kernel thread | |
125 | */ | |
126 | int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) | |
127 | { | |
128 | long retval; | |
129 | long clone_arg; | |
130 | mm_segment_t fs; | |
131 | ||
132 | fs = get_fs(); | |
133 | set_fs (KERNEL_DS); | |
134 | clone_arg = flags | CLONE_VM; | |
135 | __asm__("mov.l sp,er3\n\t" | |
136 | "sub.l er2,er2\n\t" | |
137 | "mov.l %2,er1\n\t" | |
138 | "mov.l %1,er0\n\t" | |
139 | "trapa #0\n\t" | |
140 | "cmp.l sp,er3\n\t" | |
141 | "beq 1f\n\t" | |
142 | "mov.l %4,er0\n\t" | |
143 | "mov.l %3,er1\n\t" | |
144 | "jsr @er1\n\t" | |
145 | "mov.l %5,er0\n\t" | |
146 | "trapa #0\n" | |
147 | "1:\n\t" | |
148 | "mov.l er0,%0" | |
149 | :"=r"(retval) | |
150 | :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit) | |
151 | :"er0","er1","er2","er3"); | |
152 | set_fs (fs); | |
153 | return retval; | |
154 | } | |
155 | ||
156 | void flush_thread(void) | |
157 | { | |
158 | } | |
159 | ||
160 | /* | |
161 | * "h8300_fork()".. By the time we get here, the | |
162 | * non-volatile registers have also been saved on the | |
163 | * stack. We do some ugly pointer stuff here.. (see | |
164 | * also copy_thread) | |
165 | */ | |
166 | ||
167 | asmlinkage int h8300_fork(struct pt_regs *regs) | |
168 | { | |
169 | return -EINVAL; | |
170 | } | |
171 | ||
172 | asmlinkage int h8300_vfork(struct pt_regs *regs) | |
173 | { | |
174 | return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL); | |
175 | } | |
176 | ||
177 | asmlinkage int h8300_clone(struct pt_regs *regs) | |
178 | { | |
179 | unsigned long clone_flags; | |
180 | unsigned long newsp; | |
181 | ||
182 | /* syscall2 puts clone_flags in er1 and usp in er2 */ | |
183 | clone_flags = regs->er1; | |
184 | newsp = regs->er2; | |
185 | if (!newsp) | |
186 | newsp = rdusp(); | |
187 | return do_fork(clone_flags, newsp, regs, 0, NULL, NULL); | |
188 | ||
189 | } | |
190 | ||
6f2c55b8 | 191 | int copy_thread(unsigned long clone_flags, |
1da177e4 LT |
192 | unsigned long usp, unsigned long topstk, |
193 | struct task_struct * p, struct pt_regs * regs) | |
194 | { | |
195 | struct pt_regs * childregs; | |
196 | ||
68f8b1f8 | 197 | childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; |
1da177e4 LT |
198 | |
199 | *childregs = *regs; | |
200 | childregs->retpc = (unsigned long) ret_from_fork; | |
201 | childregs->er0 = 0; | |
202 | ||
203 | p->thread.usp = usp; | |
204 | p->thread.ksp = (unsigned long)childregs; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * sys_execve() executes a new program. | |
211 | */ | |
d7627467 DH |
212 | asmlinkage int sys_execve(const char *name, |
213 | const char *const *argv, | |
214 | const char *const *envp, | |
215 | int dummy, ...) | |
1da177e4 LT |
216 | { |
217 | int error; | |
218 | char * filename; | |
219 | struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4); | |
220 | ||
1da177e4 LT |
221 | filename = getname(name); |
222 | error = PTR_ERR(filename); | |
223 | if (IS_ERR(filename)) | |
e3c1a6b3 | 224 | return error; |
1da177e4 LT |
225 | error = do_execve(filename, argv, envp, regs); |
226 | putname(filename); | |
1da177e4 LT |
227 | return error; |
228 | } | |
229 | ||
230 | unsigned long thread_saved_pc(struct task_struct *tsk) | |
231 | { | |
232 | return ((struct pt_regs *)tsk->thread.esp0)->pc; | |
233 | } | |
234 | ||
235 | unsigned long get_wchan(struct task_struct *p) | |
236 | { | |
237 | unsigned long fp, pc; | |
238 | unsigned long stack_page; | |
239 | int count = 0; | |
240 | if (!p || p == current || p->state == TASK_RUNNING) | |
241 | return 0; | |
242 | ||
243 | stack_page = (unsigned long)p; | |
244 | fp = ((struct pt_regs *)p->thread.ksp)->er6; | |
245 | do { | |
246 | if (fp < stack_page+sizeof(struct thread_info) || | |
247 | fp >= 8184+stack_page) | |
248 | return 0; | |
249 | pc = ((unsigned long *)fp)[1]; | |
250 | if (!in_sched_functions(pc)) | |
251 | return pc; | |
252 | fp = *(unsigned long *) fp; | |
253 | } while (count++ < 16); | |
254 | return 0; | |
255 | } |