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diff --git a/arch/m68k/kernel/process_no.c b/arch/m68k/kernel/process_no.c
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1/*
2 * linux/arch/m68knommu/kernel/process.c
3 *
4 * Copyright (C) 1995 Hamish Macdonald
5 *
6 * 68060 fixes by Jesper Skov
7 *
8 * uClinux changes
9 * Copyright (C) 2000-2002, David McCullough <davidm@snapgear.com>
10 */
11
12/*
13 * This file handles the architecture-dependent parts of process handling..
14 */
15
16#include <linux/module.h>
17#include <linux/errno.h>
18#include <linux/sched.h>
19#include <linux/kernel.h>
20#include <linux/mm.h>
21#include <linux/smp.h>
22#include <linux/stddef.h>
23#include <linux/unistd.h>
24#include <linux/ptrace.h>
25#include <linux/user.h>
26#include <linux/interrupt.h>
27#include <linux/reboot.h>
28#include <linux/fs.h>
29#include <linux/slab.h>
30
31#include <asm/uaccess.h>
32#include <asm/system.h>
33#include <asm/traps.h>
34#include <asm/machdep.h>
35#include <asm/setup.h>
36#include <asm/pgtable.h>
37
38asmlinkage void ret_from_fork(void);
39
40/*
41 * The following aren't currently used.
42 */
43void (*pm_idle)(void);
44EXPORT_SYMBOL(pm_idle);
45
46void (*pm_power_off)(void);
47EXPORT_SYMBOL(pm_power_off);
48
49/*
50 * The idle loop on an m68knommu..
51 */
52static void default_idle(void)
53{
54 local_irq_disable();
55 while (!need_resched()) {
56 /* This stop will re-enable interrupts */
57 __asm__("stop #0x2000" : : : "cc");
58 local_irq_disable();
59 }
60 local_irq_enable();
61}
62
63void (*idle)(void) = default_idle;
64
65/*
66 * The idle thread. There's no useful work to be
67 * done, so just try to conserve power and have a
68 * low exit latency (ie sit in a loop waiting for
69 * somebody to say that they'd like to reschedule)
70 */
71void cpu_idle(void)
72{
73 /* endless idle loop with no priority at all */
74 while (1) {
75 idle();
76 preempt_enable_no_resched();
77 schedule();
78 preempt_disable();
79 }
80}
81
82void machine_restart(char * __unused)
83{
84 if (mach_reset)
85 mach_reset();
86 for (;;);
87}
88
89void machine_halt(void)
90{
91 if (mach_halt)
92 mach_halt();
93 for (;;);
94}
95
96void machine_power_off(void)
97{
98 if (mach_power_off)
99 mach_power_off();
100 for (;;);
101}
102
103void show_regs(struct pt_regs * regs)
104{
105 printk(KERN_NOTICE "\n");
106 printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
107 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
108 printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
109 regs->orig_d0, regs->d0, regs->a2, regs->a1);
110 printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
111 regs->a0, regs->d5, regs->d4);
112 printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
113 regs->d3, regs->d2, regs->d1);
114 if (!(regs->sr & PS_S))
115 printk(KERN_NOTICE "USP: %08lx\n", rdusp());
116}
117
118/*
119 * Create a kernel thread
120 */
121int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
122{
123 int retval;
124 long clone_arg = flags | CLONE_VM;
125 mm_segment_t fs;
126
127 fs = get_fs();
128 set_fs(KERNEL_DS);
129
130 __asm__ __volatile__ (
131 "movel %%sp, %%d2\n\t"
132 "movel %5, %%d1\n\t"
133 "movel %1, %%d0\n\t"
134 "trap #0\n\t"
135 "cmpl %%sp, %%d2\n\t"
136 "jeq 1f\n\t"
137 "movel %3, %%sp@-\n\t"
138 "jsr %4@\n\t"
139 "movel %2, %%d0\n\t"
140 "trap #0\n"
141 "1:\n\t"
142 "movel %%d0, %0\n"
143 : "=d" (retval)
144 : "i" (__NR_clone),
145 "i" (__NR_exit),
146 "a" (arg),
147 "a" (fn),
148 "a" (clone_arg)
149 : "cc", "%d0", "%d1", "%d2");
150
151 set_fs(fs);
152 return retval;
153}
154
155void flush_thread(void)
156{
157#ifdef CONFIG_FPU
158 unsigned long zero = 0;
159#endif
160 set_fs(USER_DS);
161 current->thread.fs = __USER_DS;
162#ifdef CONFIG_FPU
163 if (!FPU_IS_EMU)
164 asm volatile (".chip 68k/68881\n\t"
165 "frestore %0@\n\t"
166 ".chip 68k" : : "a" (&zero));
167#endif
168}
169
170/*
171 * "m68k_fork()".. By the time we get here, the
172 * non-volatile registers have also been saved on the
173 * stack. We do some ugly pointer stuff here.. (see
174 * also copy_thread)
175 */
176
177asmlinkage int m68k_fork(struct pt_regs *regs)
178{
179 /* fork almost works, enough to trick you into looking elsewhere :-( */
180 return(-EINVAL);
181}
182
183asmlinkage int m68k_vfork(struct pt_regs *regs)
184{
185 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
186}
187
188asmlinkage int m68k_clone(struct pt_regs *regs)
189{
190 unsigned long clone_flags;
191 unsigned long newsp;
192
193 /* syscall2 puts clone_flags in d1 and usp in d2 */
194 clone_flags = regs->d1;
195 newsp = regs->d2;
196 if (!newsp)
197 newsp = rdusp();
198 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
199}
200
201int copy_thread(unsigned long clone_flags,
202 unsigned long usp, unsigned long topstk,
203 struct task_struct * p, struct pt_regs * regs)
204{
205 struct pt_regs * childregs;
206 struct switch_stack * childstack, *stack;
207 unsigned long *retp;
208
209 childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
210
211 *childregs = *regs;
212 childregs->d0 = 0;
213
214 retp = ((unsigned long *) regs);
215 stack = ((struct switch_stack *) retp) - 1;
216
217 childstack = ((struct switch_stack *) childregs) - 1;
218 *childstack = *stack;
219 childstack->retpc = (unsigned long)ret_from_fork;
220
221 p->thread.usp = usp;
222 p->thread.ksp = (unsigned long)childstack;
223
224 if (clone_flags & CLONE_SETTLS)
225 task_thread_info(p)->tp_value = regs->d5;
226
227 /*
228 * Must save the current SFC/DFC value, NOT the value when
229 * the parent was last descheduled - RGH 10-08-96
230 */
231 p->thread.fs = get_fs().seg;
232
233#ifdef CONFIG_FPU
234 if (!FPU_IS_EMU) {
235 /* Copy the current fpu state */
236 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
237
238 if (p->thread.fpstate[0])
239 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
240 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
241 : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
242 : "memory");
243 /* Restore the state in case the fpu was busy */
244 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
245 }
246#endif
247
248 return 0;
249}
250
251/* Fill in the fpu structure for a core dump. */
252
253int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
254{
255#ifdef CONFIG_FPU
256 char fpustate[216];
257
258 if (FPU_IS_EMU) {
259 int i;
260
261 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
262 memcpy(fpu->fpregs, current->thread.fp, 96);
263 /* Convert internal fpu reg representation
264 * into long double format
265 */
266 for (i = 0; i < 24; i += 3)
267 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
268 ((fpu->fpregs[i] & 0x0000ffff) << 16);
269 return 1;
270 }
271
272 /* First dump the fpu context to avoid protocol violation. */
273 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
274 if (!fpustate[0])
275 return 0;
276
277 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
278 :: "m" (fpu->fpcntl[0])
279 : "memory");
280 asm volatile ("fmovemx %/fp0-%/fp7,%0"
281 :: "m" (fpu->fpregs[0])
282 : "memory");
283#endif
284 return 1;
285}
286
287/*
288 * Generic dumping code. Used for panic and debug.
289 */
290void dump(struct pt_regs *fp)
291{
292 unsigned long *sp;
293 unsigned char *tp;
294 int i;
295
296 printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
297 printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
298
299 if (current->mm) {
300 printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
301 (int) current->mm->start_code,
302 (int) current->mm->end_code,
303 (int) current->mm->start_data,
304 (int) current->mm->end_data,
305 (int) current->mm->end_data,
306 (int) current->mm->brk);
307 printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
308 (int) current->mm->start_stack,
309 (int)(((unsigned long) current) + THREAD_SIZE));
310 }
311
312 printk(KERN_EMERG "PC: %08lx\n", fp->pc);
313 printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
314 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
315 fp->d0, fp->d1, fp->d2, fp->d3);
316 printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
317 fp->d4, fp->d5, fp->a0, fp->a1);
318 printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %p\n",
319 (unsigned int) rdusp(), fp);
320
321 printk(KERN_EMERG "\nCODE:");
322 tp = ((unsigned char *) fp->pc) - 0x20;
323 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
324 if ((i % 0x10) == 0)
325 printk(KERN_EMERG "%p: ", tp + i);
326 printk("%08x ", (int) *sp++);
327 }
328 printk(KERN_EMERG "\n");
329
330 printk(KERN_EMERG "KERNEL STACK:");
331 tp = ((unsigned char *) fp) - 0x40;
332 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
333 if ((i % 0x10) == 0)
334 printk(KERN_EMERG "%p: ", tp + i);
335 printk("%08x ", (int) *sp++);
336 }
337 printk(KERN_EMERG "\n");
338
339 printk(KERN_EMERG "USER STACK:");
340 tp = (unsigned char *) (rdusp() - 0x10);
341 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
342 if ((i % 0x10) == 0)
343 printk(KERN_EMERG "%p: ", tp + i);
344 printk("%08x ", (int) *sp++);
345 }
346 printk(KERN_EMERG "\n");
347}
348
349/*
350 * sys_execve() executes a new program.
351 */
352asmlinkage int sys_execve(const char *name,
353 const char *const *argv,
354 const char *const *envp)
355{
356 int error;
357 char * filename;
358 struct pt_regs *regs = (struct pt_regs *) &name;
359
360 filename = getname(name);
361 error = PTR_ERR(filename);
362 if (IS_ERR(filename))
363 return error;
364 error = do_execve(filename, argv, envp, regs);
365 putname(filename);
366 return error;
367}
368
369unsigned long get_wchan(struct task_struct *p)
370{
371 unsigned long fp, pc;
372 unsigned long stack_page;
373 int count = 0;
374 if (!p || p == current || p->state == TASK_RUNNING)
375 return 0;
376
377 stack_page = (unsigned long)p;
378 fp = ((struct switch_stack *)p->thread.ksp)->a6;
379 do {
380 if (fp < stack_page+sizeof(struct thread_info) ||
381 fp >= THREAD_SIZE-8+stack_page)
382 return 0;
383 pc = ((unsigned long *)fp)[1];
384 if (!in_sched_functions(pc))
385 return pc;
386 fp = *(unsigned long *) fp;
387 } while (count++ < 16);
388 return 0;
389}
390
391/*
392 * Return saved PC of a blocked thread.
393 */
394unsigned long thread_saved_pc(struct task_struct *tsk)
395{
396 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
397
398 /* Check whether the thread is blocked in resume() */
399 if (in_sched_functions(sw->retpc))
400 return ((unsigned long *)sw->a6)[1];
401 else
402 return sw->retpc;
403}
404