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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/smp_lock.h>
32#include <linux/stddef.h>
33#include <linux/unistd.h>
34#include <linux/ptrace.h>
35#include <linux/slab.h>
36#include <linux/user.h>
37#include <linux/interrupt.h>
38#include <linux/reboot.h>
39#include <linux/fs.h>
40
41#include <asm/uaccess.h>
42#include <asm/system.h>
43#include <asm/traps.h>
44#include <asm/setup.h>
45#include <asm/pgtable.h>
46
47void (*pm_power_off)(void) = NULL;
48EXPORT_SYMBOL(pm_power_off);
49
50asmlinkage void ret_from_fork(void);
51
52
53
54
55#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
56static void default_idle(void)
57{
58 local_irq_disable();
59 if (!need_resched()) {
60 local_irq_enable();
61
62 __asm__("sleep");
63 } else
64 local_irq_enable();
65}
66#else
67static void default_idle(void)
68{
69 cpu_relax();
70}
71#endif
72void (*idle)(void) = default_idle;
73
74
75
76
77
78
79
80void cpu_idle(void)
81{
82 while (1) {
83 while (!need_resched())
84 idle();
85 preempt_enable_no_resched();
86 schedule();
87 preempt_disable();
88 }
89}
90
91void machine_restart(char * __unused)
92{
93 local_irq_disable();
94 __asm__("jmp @@0");
95}
96
97void machine_halt(void)
98{
99 local_irq_disable();
100 __asm__("sleep");
101 for (;;);
102}
103
104void machine_power_off(void)
105{
106 local_irq_disable();
107 __asm__("sleep");
108 for (;;);
109}
110
111void show_regs(struct pt_regs * regs)
112{
113 printk("\nPC: %08lx Status: %02x",
114 regs->pc, regs->ccr);
115 printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
116 regs->orig_er0, regs->er0, regs->er1);
117 printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
118 regs->er2, regs->er3, regs->er4, regs->er5);
119 printk("\nER6' %08lx ",regs->er6);
120 if (user_mode(regs))
121 printk("USP: %08lx\n", rdusp());
122 else
123 printk("\n");
124}
125
126
127
128
129int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
130{
131 long retval;
132 long clone_arg;
133 mm_segment_t fs;
134
135 fs = get_fs();
136 set_fs (KERNEL_DS);
137 clone_arg = flags | CLONE_VM;
138 __asm__("mov.l sp,er3\n\t"
139 "sub.l er2,er2\n\t"
140 "mov.l %2,er1\n\t"
141 "mov.l %1,er0\n\t"
142 "trapa #0\n\t"
143 "cmp.l sp,er3\n\t"
144 "beq 1f\n\t"
145 "mov.l %4,er0\n\t"
146 "mov.l %3,er1\n\t"
147 "jsr @er1\n\t"
148 "mov.l %5,er0\n\t"
149 "trapa #0\n"
150 "1:\n\t"
151 "mov.l er0,%0"
152 :"=r"(retval)
153 :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
154 :"er0","er1","er2","er3");
155 set_fs (fs);
156 return retval;
157}
158
159void flush_thread(void)
160{
161}
162
163
164
165
166
167
168
169
170asmlinkage int h8300_fork(struct pt_regs *regs)
171{
172 return -EINVAL;
173}
174
175asmlinkage int h8300_vfork(struct pt_regs *regs)
176{
177 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
178}
179
180asmlinkage int h8300_clone(struct pt_regs *regs)
181{
182 unsigned long clone_flags;
183 unsigned long newsp;
184
185
186 clone_flags = regs->er1;
187 newsp = regs->er2;
188 if (!newsp)
189 newsp = rdusp();
190 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
191
192}
193
194int copy_thread(unsigned long clone_flags,
195 unsigned long usp, unsigned long topstk,
196 struct task_struct * p, struct pt_regs * regs)
197{
198 struct pt_regs * childregs;
199
200 childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
201
202 *childregs = *regs;
203 childregs->retpc = (unsigned long) ret_from_fork;
204 childregs->er0 = 0;
205
206 p->thread.usp = usp;
207 p->thread.ksp = (unsigned long)childregs;
208
209 return 0;
210}
211
212
213
214
215asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
216{
217 int error;
218 char * filename;
219 struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
220
221 lock_kernel();
222 filename = getname(name);
223 error = PTR_ERR(filename);
224 if (IS_ERR(filename))
225 goto out;
226 error = do_execve(filename, argv, envp, regs);
227 putname(filename);
228out:
229 unlock_kernel();
230 return error;
231}
232
233unsigned long thread_saved_pc(struct task_struct *tsk)
234{
235 return ((struct pt_regs *)tsk->thread.esp0)->pc;
236}
237
238unsigned long get_wchan(struct task_struct *p)
239{
240 unsigned long fp, pc;
241 unsigned long stack_page;
242 int count = 0;
243 if (!p || p == current || p->state == TASK_RUNNING)
244 return 0;
245
246 stack_page = (unsigned long)p;
247 fp = ((struct pt_regs *)p->thread.ksp)->er6;
248 do {
249 if (fp < stack_page+sizeof(struct thread_info) ||
250 fp >= 8184+stack_page)
251 return 0;
252 pc = ((unsigned long *)fp)[1];
253 if (!in_sched_functions(pc))
254 return pc;
255 fp = *(unsigned long *) fp;
256 } while (count++ < 16);
257 return 0;
258}
259