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[NETLINK]: w1_int.c: fix default netlink group
[linux-2.6/verdex.git] / arch / m68knommu / kernel / process.c
blob82e7ec8888064589dcf642e336f11d32e209dd0b
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/config.h>
17 #include <linux/module.h>
18 #include <linux/errno.h>
19 #include <linux/sched.h>
20 #include <linux/kernel.h>
21 #include <linux/mm.h>
22 #include <linux/smp.h>
23 #include <linux/smp_lock.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/ptrace.h>
27 #include <linux/slab.h>
28 #include <linux/user.h>
29 #include <linux/a.out.h>
30 #include <linux/interrupt.h>
31 #include <linux/reboot.h>
32
33 #include <asm/uaccess.h>
34 #include <asm/system.h>
35 #include <asm/traps.h>
36 #include <asm/machdep.h>
37 #include <asm/setup.h>
38 #include <asm/pgtable.h>
39
40 asmlinkage void ret_from_fork(void);
41
42
43 /*
44 * The idle loop on an m68knommu..
45 */
46 void default_idle(void)
47 {
48 local_irq_disable();
49 while (!need_resched()) {
50 /* This stop will re-enable interrupts */
51 __asm__("stop #0x2000" : : : "cc");
52 local_irq_disable();
53 }
54 local_irq_enable();
55 }
56
57 void (*idle)(void) = default_idle;
58
59 /*
60 * The idle thread. There's no useful work to be
61 * done, so just try to conserve power and have a
62 * low exit latency (ie sit in a loop waiting for
63 * somebody to say that they'd like to reschedule)
64 */
65 void cpu_idle(void)
66 {
67 /* endless idle loop with no priority at all */
68 while (1) {
69 idle();
70 preempt_enable_no_resched();
71 schedule();
72 preempt_disable();
73 }
74 }
75
76 void machine_restart(char * __unused)
77 {
78 if (mach_reset)
79 mach_reset();
80 for (;;);
81 }
82
83 void machine_halt(void)
84 {
85 if (mach_halt)
86 mach_halt();
87 for (;;);
88 }
89
90 void machine_power_off(void)
91 {
92 if (mach_power_off)
93 mach_power_off();
94 for (;;);
95 }
96
97 void show_regs(struct pt_regs * regs)
98 {
99 printk(KERN_NOTICE "\n");
100 printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
101 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
102 printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
103 regs->orig_d0, regs->d0, regs->a2, regs->a1);
104 printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
105 regs->a0, regs->d5, regs->d4);
106 printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
107 regs->d3, regs->d2, regs->d1);
108 if (!(regs->sr & PS_S))
109 printk(KERN_NOTICE "USP: %08lx\n", rdusp());
110 }
111
112 /*
113 * Create a kernel thread
114 */
115 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
116 {
117 int retval;
118 long clone_arg = flags | CLONE_VM;
119 mm_segment_t fs;
120
121 fs = get_fs();
122 set_fs(KERNEL_DS);
123
124 __asm__ __volatile__ (
125 "movel %%sp, %%d2\n\t"
126 "movel %5, %%d1\n\t"
127 "movel %1, %%d0\n\t"
128 "trap #0\n\t"
129 "cmpl %%sp, %%d2\n\t"
130 "jeq 1f\n\t"
131 "movel %3, %%sp@-\n\t"
132 "jsr %4@\n\t"
133 "movel %2, %%d0\n\t"
134 "trap #0\n"
135 "1:\n\t"
136 "movel %%d0, %0\n"
137 : "=d" (retval)
138 : "i" (__NR_clone),
139 "i" (__NR_exit),
140 "a" (arg),
141 "a" (fn),
142 "a" (clone_arg)
143 : "cc", "%d0", "%d1", "%d2");
144
145 set_fs(fs);
146 return retval;
147 }
148
149 void flush_thread(void)
150 {
151 #ifdef CONFIG_FPU
152 unsigned long zero = 0;
153 #endif
154 set_fs(USER_DS);
155 current->thread.fs = __USER_DS;
156 #ifdef CONFIG_FPU
157 if (!FPU_IS_EMU)
158 asm volatile (".chip 68k/68881\n\t"
159 "frestore %0@\n\t"
160 ".chip 68k" : : "a" (&zero));
161 #endif
162 }
163
164 /*
165 * "m68k_fork()".. By the time we get here, the
166 * non-volatile registers have also been saved on the
167 * stack. We do some ugly pointer stuff here.. (see
168 * also copy_thread)
169 */
170
171 asmlinkage int m68k_fork(struct pt_regs *regs)
172 {
173 /* fork almost works, enough to trick you into looking elsewhere :-( */
174 return(-EINVAL);
175 }
176
177 asmlinkage int m68k_vfork(struct pt_regs *regs)
178 {
179 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
180 }
181
182 asmlinkage int m68k_clone(struct pt_regs *regs)
183 {
184 unsigned long clone_flags;
185 unsigned long newsp;
186
187 /* syscall2 puts clone_flags in d1 and usp in d2 */
188 clone_flags = regs->d1;
189 newsp = regs->d2;
190 if (!newsp)
191 newsp = rdusp();
192 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
193 }
194
195 int copy_thread(int nr, unsigned long clone_flags,
196 unsigned long usp, unsigned long topstk,
197 struct task_struct * p, struct pt_regs * regs)
198 {
199 struct pt_regs * childregs;
200 struct switch_stack * childstack, *stack;
201 unsigned long stack_offset, *retp;
202
203 stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
204 childregs = (struct pt_regs *) ((unsigned long) p->thread_info + stack_offset);
205
206 *childregs = *regs;
207 childregs->d0 = 0;
208
209 retp = ((unsigned long *) regs);
210 stack = ((struct switch_stack *) retp) - 1;
211
212 childstack = ((struct switch_stack *) childregs) - 1;
213 *childstack = *stack;
214 childstack->retpc = (unsigned long)ret_from_fork;
215
216 p->thread.usp = usp;
217 p->thread.ksp = (unsigned long)childstack;
218 /*
219 * Must save the current SFC/DFC value, NOT the value when
220 * the parent was last descheduled - RGH 10-08-96
221 */
222 p->thread.fs = get_fs().seg;
223
224 #ifdef CONFIG_FPU
225 if (!FPU_IS_EMU) {
226 /* Copy the current fpu state */
227 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
228
229 if (p->thread.fpstate[0])
230 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
231 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
232 : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
233 : "memory");
234 /* Restore the state in case the fpu was busy */
235 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
236 }
237 #endif
238
239 return 0;
240 }
241
242 /* Fill in the fpu structure for a core dump. */
243
244 int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
245 {
246 #ifdef CONFIG_FPU
247 char fpustate[216];
248
249 if (FPU_IS_EMU) {
250 int i;
251
252 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
253 memcpy(fpu->fpregs, current->thread.fp, 96);
254 /* Convert internal fpu reg representation
255 * into long double format
256 */
257 for (i = 0; i < 24; i += 3)
258 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
259 ((fpu->fpregs[i] & 0x0000ffff) << 16);
260 return 1;
261 }
262
263 /* First dump the fpu context to avoid protocol violation. */
264 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
265 if (!fpustate[0])
266 return 0;
267
268 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
269 :: "m" (fpu->fpcntl[0])
270 : "memory");
271 asm volatile ("fmovemx %/fp0-%/fp7,%0"
272 :: "m" (fpu->fpregs[0])
273 : "memory");
274 #endif
275 return 1;
276 }
277
278 /*
279 * fill in the user structure for a core dump..
280 */
281 void dump_thread(struct pt_regs * regs, struct user * dump)
282 {
283 struct switch_stack *sw;
284
285 /* changed the size calculations - should hopefully work better. lbt */
286 dump->magic = CMAGIC;
287 dump->start_code = 0;
288 dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
289 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
290 dump->u_dsize = ((unsigned long) (current->mm->brk +
291 (PAGE_SIZE-1))) >> PAGE_SHIFT;
292 dump->u_dsize -= dump->u_tsize;
293 dump->u_ssize = 0;
294
295 if (dump->start_stack < TASK_SIZE)
296 dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
297
298 dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
299 sw = ((struct switch_stack *)regs) - 1;
300 dump->regs.d1 = regs->d1;
301 dump->regs.d2 = regs->d2;
302 dump->regs.d3 = regs->d3;
303 dump->regs.d4 = regs->d4;
304 dump->regs.d5 = regs->d5;
305 dump->regs.d6 = sw->d6;
306 dump->regs.d7 = sw->d7;
307 dump->regs.a0 = regs->a0;
308 dump->regs.a1 = regs->a1;
309 dump->regs.a2 = regs->a2;
310 dump->regs.a3 = sw->a3;
311 dump->regs.a4 = sw->a4;
312 dump->regs.a5 = sw->a5;
313 dump->regs.a6 = sw->a6;
314 dump->regs.d0 = regs->d0;
315 dump->regs.orig_d0 = regs->orig_d0;
316 dump->regs.stkadj = regs->stkadj;
317 dump->regs.sr = regs->sr;
318 dump->regs.pc = regs->pc;
319 dump->regs.fmtvec = (regs->format << 12) | regs->vector;
320 /* dump floating point stuff */
321 dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
322 }
323
324 /*
325 * Generic dumping code. Used for panic and debug.
326 */
327 void dump(struct pt_regs *fp)
328 {
329 unsigned long *sp;
330 unsigned char *tp;
331 int i;
332
333 printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
334 printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
335
336 if (current->mm) {
337 printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
338 (int) current->mm->start_code,
339 (int) current->mm->end_code,
340 (int) current->mm->start_data,
341 (int) current->mm->end_data,
342 (int) current->mm->end_data,
343 (int) current->mm->brk);
344 printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
345 (int) current->mm->start_stack,
346 (int)(((unsigned long) current) + THREAD_SIZE));
347 }
348
349 printk(KERN_EMERG "PC: %08lx\n", fp->pc);
350 printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
351 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
352 fp->d0, fp->d1, fp->d2, fp->d3);
353 printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
354 fp->d4, fp->d5, fp->a0, fp->a1);
355 printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %08x\n", (unsigned int) rdusp(),
356 (unsigned int) fp);
357
358 printk(KERN_EMERG "\nCODE:");
359 tp = ((unsigned char *) fp->pc) - 0x20;
360 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
361 if ((i % 0x10) == 0)
362 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
363 printk(KERN_EMERG "%08x ", (int) *sp++);
364 }
365 printk(KERN_EMERG "\n");
366
367 printk(KERN_EMERG "\nKERNEL STACK:");
368 tp = ((unsigned char *) fp) - 0x40;
369 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
370 if ((i % 0x10) == 0)
371 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
372 printk(KERN_EMERG "%08x ", (int) *sp++);
373 }
374 printk(KERN_EMERG "\n");
375 printk(KERN_EMERG "\n");
376
377 printk(KERN_EMERG "\nUSER STACK:");
378 tp = (unsigned char *) (rdusp() - 0x10);
379 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
380 if ((i % 0x10) == 0)
381 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
382 printk(KERN_EMERG "%08x ", (int) *sp++);
383 }
384 printk(KERN_EMERG "\n\n");
385 }
386
387 /*
388 * sys_execve() executes a new program.
389 */
390 asmlinkage int sys_execve(char *name, char **argv, char **envp)
391 {
392 int error;
393 char * filename;
394 struct pt_regs *regs = (struct pt_regs *) &name;
395
396 lock_kernel();
397 filename = getname(name);
398 error = PTR_ERR(filename);
399 if (IS_ERR(filename))
400 goto out;
401 error = do_execve(filename, argv, envp, regs);
402 putname(filename);
403 out:
404 unlock_kernel();
405 return error;
406 }
407
408 unsigned long get_wchan(struct task_struct *p)
409 {
410 unsigned long fp, pc;
411 unsigned long stack_page;
412 int count = 0;
413 if (!p || p == current || p->state == TASK_RUNNING)
414 return 0;
415
416 stack_page = (unsigned long)p;
417 fp = ((struct switch_stack *)p->thread.ksp)->a6;
418 do {
419 if (fp < stack_page+sizeof(struct thread_info) ||
420 fp >= 8184+stack_page)
421 return 0;
422 pc = ((unsigned long *)fp)[1];
423 if (!in_sched_functions(pc))
424 return pc;
425 fp = *(unsigned long *) fp;
426 } while (count++ < 16);
427 return 0;
428 }
429
430 /*
431 * Return saved PC of a blocked thread.
432 */
433 unsigned long thread_saved_pc(struct task_struct *tsk)
434 {
435 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
436
437 /* Check whether the thread is blocked in resume() */
438 if (in_sched_functions(sw->retpc))
439 return ((unsigned long *)sw->a6)[1];
440 else
441 return sw->retpc;
442 }
443
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