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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/h8300/kernel/process.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/h8300/kernel/process.c')
-rw-r--r--arch/h8300/kernel/process.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
new file mode 100644
index 000000000000..134aec1c6d19
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+++ b/arch/h8300/kernel/process.c
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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/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) {
57 if (need_resched()) {
58 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
93EXPORT_SYMBOL(machine_restart);
94
95void machine_halt(void)
96{
97 local_irq_disable();
98 __asm__("sleep");
99 for (;;);
100}
101
102EXPORT_SYMBOL(machine_halt);
103
104void machine_power_off(void)
105{
106 local_irq_disable();
107 __asm__("sleep");
108 for (;;);
109}
110
111EXPORT_SYMBOL(machine_power_off);
112
113void show_regs(struct pt_regs * regs)
114{
115 printk("\nPC: %08lx Status: %02x",
116 regs->pc, regs->ccr);
117 printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
118 regs->orig_er0, regs->er0, regs->er1);
119 printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
120 regs->er2, regs->er3, regs->er4, regs->er5);
121 printk("\nER6' %08lx ",regs->er6);
122 if (user_mode(regs))
123 printk("USP: %08lx\n", rdusp());
124 else
125 printk("\n");
126}
127
128/*
129 * Create a kernel thread
130 */
131int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
132{
133 long retval;
134 long clone_arg;
135 mm_segment_t fs;
136
137 fs = get_fs();
138 set_fs (KERNEL_DS);
139 clone_arg = flags | CLONE_VM;
140 __asm__("mov.l sp,er3\n\t"
141 "sub.l er2,er2\n\t"
142 "mov.l %2,er1\n\t"
143 "mov.l %1,er0\n\t"
144 "trapa #0\n\t"
145 "cmp.l sp,er3\n\t"
146 "beq 1f\n\t"
147 "mov.l %4,er0\n\t"
148 "mov.l %3,er1\n\t"
149 "jsr @er1\n\t"
150 "mov.l %5,er0\n\t"
151 "trapa #0\n"
152 "1:\n\t"
153 "mov.l er0,%0"
154 :"=r"(retval)
155 :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
156 :"er0","er1","er2","er3");
157 set_fs (fs);
158 return retval;
159}
160
161void flush_thread(void)
162{
163}
164
165/*
166 * "h8300_fork()".. By the time we get here, the
167 * non-volatile registers have also been saved on the
168 * stack. We do some ugly pointer stuff here.. (see
169 * also copy_thread)
170 */
171
172asmlinkage int h8300_fork(struct pt_regs *regs)
173{
174 return -EINVAL;
175}
176
177asmlinkage int h8300_vfork(struct pt_regs *regs)
178{
179 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
180}
181
182asmlinkage int h8300_clone(struct pt_regs *regs)
183{
184 unsigned long clone_flags;
185 unsigned long newsp;
186
187 /* syscall2 puts clone_flags in er1 and usp in er2 */
188 clone_flags = regs->er1;
189 newsp = regs->er2;
190 if (!newsp)
191 newsp = rdusp();
192 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
193
194}
195
196int copy_thread(int nr, unsigned long clone_flags,
197 unsigned long usp, unsigned long topstk,
198 struct task_struct * p, struct pt_regs * regs)
199{
200 struct pt_regs * childregs;
201
202 childregs = ((struct pt_regs *) (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
203
204 *childregs = *regs;
205 childregs->retpc = (unsigned long) ret_from_fork;
206 childregs->er0 = 0;
207
208 p->thread.usp = usp;
209 p->thread.ksp = (unsigned long)childregs;
210
211 return 0;
212}
213
214/*
215 * fill in the user structure for a core dump..
216 */
217void dump_thread(struct pt_regs * regs, struct user * dump)
218{
219/* changed the size calculations - should hopefully work better. lbt */
220 dump->magic = CMAGIC;
221 dump->start_code = 0;
222 dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
223 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
224 dump->u_dsize = ((unsigned long) (current->mm->brk +
225 (PAGE_SIZE-1))) >> PAGE_SHIFT;
226 dump->u_dsize -= dump->u_tsize;
227 dump->u_ssize = 0;
228
229 dump->u_ar0 = (struct user_regs_struct *)(((int)(&dump->regs)) -((int)(dump)));
230 dump->regs.er0 = regs->er0;
231 dump->regs.er1 = regs->er1;
232 dump->regs.er2 = regs->er2;
233 dump->regs.er3 = regs->er3;
234 dump->regs.er4 = regs->er4;
235 dump->regs.er5 = regs->er5;
236 dump->regs.er6 = regs->er6;
237 dump->regs.orig_er0 = regs->orig_er0;
238 dump->regs.ccr = regs->ccr;
239 dump->regs.pc = regs->pc;
240}
241
242/*
243 * sys_execve() executes a new program.
244 */
245asmlinkage int sys_execve(char *name, char **argv, char **envp,int dummy,...)
246{
247 int error;
248 char * filename;
249 struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
250
251 lock_kernel();
252 filename = getname(name);
253 error = PTR_ERR(filename);
254 if (IS_ERR(filename))
255 goto out;
256 error = do_execve(filename, argv, envp, regs);
257 putname(filename);
258out:
259 unlock_kernel();
260 return error;
261}
262
263unsigned long thread_saved_pc(struct task_struct *tsk)
264{
265 return ((struct pt_regs *)tsk->thread.esp0)->pc;
266}
267
268unsigned long get_wchan(struct task_struct *p)
269{
270 unsigned long fp, pc;
271 unsigned long stack_page;
272 int count = 0;
273 if (!p || p == current || p->state == TASK_RUNNING)
274 return 0;
275
276 stack_page = (unsigned long)p;
277 fp = ((struct pt_regs *)p->thread.ksp)->er6;
278 do {
279 if (fp < stack_page+sizeof(struct thread_info) ||
280 fp >= 8184+stack_page)
281 return 0;
282 pc = ((unsigned long *)fp)[1];
283 if (!in_sched_functions(pc))
284 return pc;
285 fp = *(unsigned long *) fp;
286 } while (count++ < 16);
287 return 0;
288}