blob: 27f1fce64ce465026ee90c0cffd2e25717843075 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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/config.h>
26#include <linux/errno.h>
27#include <linux/module.h>
28#include <linux/sched.h>
29#include <linux/kernel.h>
30#include <linux/mm.h>
31#include <linux/smp.h>
32#include <linux/smp_lock.h>
33#include <linux/stddef.h>
34#include <linux/unistd.h>
35#include <linux/ptrace.h>
36#include <linux/slab.h>
37#include <linux/user.h>
38#include <linux/a.out.h>
39#include <linux/interrupt.h>
40#include <linux/reboot.h>
41
42#include <asm/uaccess.h>
43#include <asm/system.h>
44#include <asm/traps.h>
45#include <asm/setup.h>
46#include <asm/pgtable.h>
47
48asmlinkage void ret_from_fork(void);
49
50/*
51 * The idle loop on an H8/300..
52 */
53#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
54void default_idle(void)
55{
56 while(1) {
Nick Piggin2e214952005-05-31 14:39:28 -070057 if (!need_resched()) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 local_irq_enable();
59 __asm__("sleep");
60 local_irq_disable();
61 }
62 schedule();
63 }
64}
65#else
66void default_idle(void)
67{
68 while(1) {
69 if (need_resched())
70 schedule();
71 }
72}
73#endif
74void (*idle)(void) = default_idle;
75
76/*
77 * The idle thread. There's no useful work to be
78 * done, so just try to conserve power and have a
79 * low exit latency (ie sit in a loop waiting for
80 * somebody to say that they'd like to reschedule)
81 */
82void cpu_idle(void)
83{
84 idle();
85}
86
87void machine_restart(char * __unused)
88{
89 local_irq_disable();
90 __asm__("jmp @@0");
91}
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093void machine_halt(void)
94{
95 local_irq_disable();
96 __asm__("sleep");
97 for (;;);
98}
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100void machine_power_off(void)
101{
102 local_irq_disable();
103 __asm__("sleep");
104 for (;;);
105}
106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107void show_regs(struct pt_regs * regs)
108{
109 printk("\nPC: %08lx Status: %02x",
110 regs->pc, regs->ccr);
111 printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
112 regs->orig_er0, regs->er0, regs->er1);
113 printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
114 regs->er2, regs->er3, regs->er4, regs->er5);
115 printk("\nER6' %08lx ",regs->er6);
116 if (user_mode(regs))
117 printk("USP: %08lx\n", rdusp());
118 else
119 printk("\n");
120}
121
122/*
123 * Create a kernel thread
124 */
125int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
126{
127 long retval;
128 long clone_arg;
129 mm_segment_t fs;
130
131 fs = get_fs();
132 set_fs (KERNEL_DS);
133 clone_arg = flags | CLONE_VM;
134 __asm__("mov.l sp,er3\n\t"
135 "sub.l er2,er2\n\t"
136 "mov.l %2,er1\n\t"
137 "mov.l %1,er0\n\t"
138 "trapa #0\n\t"
139 "cmp.l sp,er3\n\t"
140 "beq 1f\n\t"
141 "mov.l %4,er0\n\t"
142 "mov.l %3,er1\n\t"
143 "jsr @er1\n\t"
144 "mov.l %5,er0\n\t"
145 "trapa #0\n"
146 "1:\n\t"
147 "mov.l er0,%0"
148 :"=r"(retval)
149 :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
150 :"er0","er1","er2","er3");
151 set_fs (fs);
152 return retval;
153}
154
155void flush_thread(void)
156{
157}
158
159/*
160 * "h8300_fork()".. By the time we get here, the
161 * non-volatile registers have also been saved on the
162 * stack. We do some ugly pointer stuff here.. (see
163 * also copy_thread)
164 */
165
166asmlinkage int h8300_fork(struct pt_regs *regs)
167{
168 return -EINVAL;
169}
170
171asmlinkage int h8300_vfork(struct pt_regs *regs)
172{
173 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
174}
175
176asmlinkage int h8300_clone(struct pt_regs *regs)
177{
178 unsigned long clone_flags;
179 unsigned long newsp;
180
181 /* syscall2 puts clone_flags in er1 and usp in er2 */
182 clone_flags = regs->er1;
183 newsp = regs->er2;
184 if (!newsp)
185 newsp = rdusp();
186 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
187
188}
189
190int copy_thread(int nr, unsigned long clone_flags,
191 unsigned long usp, unsigned long topstk,
192 struct task_struct * p, struct pt_regs * regs)
193{
194 struct pt_regs * childregs;
195
196 childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
197
198 *childregs = *regs;
199 childregs->retpc = (unsigned long) ret_from_fork;
200 childregs->er0 = 0;
201
202 p->thread.usp = usp;
203 p->thread.ksp = (unsigned long)childregs;
204
205 return 0;
206}
207
208/*
209 * fill in the user structure for a core dump..
210 */
211void dump_thread(struct pt_regs * regs, struct user * dump)
212{
213/* changed the size calculations - should hopefully work better. lbt */
214 dump->magic = CMAGIC;
215 dump->start_code = 0;
216 dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
217 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
218 dump->u_dsize = ((unsigned long) (current->mm->brk +
219 (PAGE_SIZE-1))) >> PAGE_SHIFT;
220 dump->u_dsize -= dump->u_tsize;
221 dump->u_ssize = 0;
222
223 dump->u_ar0 = (struct user_regs_struct *)(((int)(&dump->regs)) -((int)(dump)));
224 dump->regs.er0 = regs->er0;
225 dump->regs.er1 = regs->er1;
226 dump->regs.er2 = regs->er2;
227 dump->regs.er3 = regs->er3;
228 dump->regs.er4 = regs->er4;
229 dump->regs.er5 = regs->er5;
230 dump->regs.er6 = regs->er6;
231 dump->regs.orig_er0 = regs->orig_er0;
232 dump->regs.ccr = regs->ccr;
233 dump->regs.pc = regs->pc;
234}
235
236/*
237 * sys_execve() executes a new program.
238 */
239asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
240{
241 int error;
242 char * filename;
243 struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
244
245 lock_kernel();
246 filename = getname(name);
247 error = PTR_ERR(filename);
248 if (IS_ERR(filename))
249 goto out;
250 error = do_execve(filename, argv, envp, regs);
251 putname(filename);
252out:
253 unlock_kernel();
254 return error;
255}
256
257unsigned long thread_saved_pc(struct task_struct *tsk)
258{
259 return ((struct pt_regs *)tsk->thread.esp0)->pc;
260}
261
262unsigned long get_wchan(struct task_struct *p)
263{
264 unsigned long fp, pc;
265 unsigned long stack_page;
266 int count = 0;
267 if (!p || p == current || p->state == TASK_RUNNING)
268 return 0;
269
270 stack_page = (unsigned long)p;
271 fp = ((struct pt_regs *)p->thread.ksp)->er6;
272 do {
273 if (fp < stack_page+sizeof(struct thread_info) ||
274 fp >= 8184+stack_page)
275 return 0;
276 pc = ((unsigned long *)fp)[1];
277 if (!in_sched_functions(pc))
278 return pc;
279 fp = *(unsigned long *) fp;
280 } while (count++ < 16);
281 return 0;
282}