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[TG3]: Set minimal hw interrupt mitigation.
[linux-2.6/verdex.git] / arch / m68knommu / kernel / process.c
blob2b6c9d32b7a6267754ab11b202317755a825a0b5
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 while(1) {
49 if (need_resched())
50 __asm__("stop #0x2000" : : : "cc");
51 schedule();
52 }
53 }
54
55 void (*idle)(void) = default_idle;
56
57 /*
58 * The idle thread. There's no useful work to be
59 * done, so just try to conserve power and have a
60 * low exit latency (ie sit in a loop waiting for
61 * somebody to say that they'd like to reschedule)
62 */
63 void cpu_idle(void)
64 {
65 /* endless idle loop with no priority at all */
66 idle();
67 }
68
69 void machine_restart(char * __unused)
70 {
71 if (mach_reset)
72 mach_reset();
73 for (;;);
74 }
75
76 EXPORT_SYMBOL(machine_restart);
77
78 void machine_halt(void)
79 {
80 if (mach_halt)
81 mach_halt();
82 for (;;);
83 }
84
85 EXPORT_SYMBOL(machine_halt);
86
87 void machine_power_off(void)
88 {
89 if (mach_power_off)
90 mach_power_off();
91 for (;;);
92 }
93
94 EXPORT_SYMBOL(machine_power_off);
95
96 void show_regs(struct pt_regs * regs)
97 {
98 printk(KERN_NOTICE "\n");
99 printk(KERN_NOTICE "Format %02x Vector: %04x PC: %08lx Status: %04x %s\n",
100 regs->format, regs->vector, regs->pc, regs->sr, print_tainted());
101 printk(KERN_NOTICE "ORIG_D0: %08lx D0: %08lx A2: %08lx A1: %08lx\n",
102 regs->orig_d0, regs->d0, regs->a2, regs->a1);
103 printk(KERN_NOTICE "A0: %08lx D5: %08lx D4: %08lx\n",
104 regs->a0, regs->d5, regs->d4);
105 printk(KERN_NOTICE "D3: %08lx D2: %08lx D1: %08lx\n",
106 regs->d3, regs->d2, regs->d1);
107 if (!(regs->sr & PS_S))
108 printk(KERN_NOTICE "USP: %08lx\n", rdusp());
109 }
110
111 /*
112 * Create a kernel thread
113 */
114 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
115 {
116 int retval;
117 long clone_arg = flags | CLONE_VM;
118 mm_segment_t fs;
119
120 fs = get_fs();
121 set_fs(KERNEL_DS);
122
123 __asm__ __volatile__ (
124 "movel %%sp, %%d2\n\t"
125 "movel %5, %%d1\n\t"
126 "movel %1, %%d0\n\t"
127 "trap #0\n\t"
128 "cmpl %%sp, %%d2\n\t"
129 "jeq 1f\n\t"
130 "movel %3, %%sp@-\n\t"
131 "jsr %4@\n\t"
132 "movel %2, %%d0\n\t"
133 "trap #0\n"
134 "1:\n\t"
135 "movel %%d0, %0\n"
136 : "=d" (retval)
137 : "i" (__NR_clone),
138 "i" (__NR_exit),
139 "a" (arg),
140 "a" (fn),
141 "a" (clone_arg)
142 : "cc", "%d0", "%d1", "%d2");
143
144 set_fs(fs);
145 return retval;
146 }
147
148 void flush_thread(void)
149 {
150 #ifdef CONFIG_FPU
151 unsigned long zero = 0;
152 #endif
153 set_fs(USER_DS);
154 current->thread.fs = __USER_DS;
155 #ifdef CONFIG_FPU
156 if (!FPU_IS_EMU)
157 asm volatile (".chip 68k/68881\n\t"
158 "frestore %0@\n\t"
159 ".chip 68k" : : "a" (&zero));
160 #endif
161 }
162
163 /*
164 * "m68k_fork()".. By the time we get here, the
165 * non-volatile registers have also been saved on the
166 * stack. We do some ugly pointer stuff here.. (see
167 * also copy_thread)
168 */
169
170 asmlinkage int m68k_fork(struct pt_regs *regs)
171 {
172 /* fork almost works, enough to trick you into looking elsewhere :-( */
173 return(-EINVAL);
174 }
175
176 asmlinkage int m68k_vfork(struct pt_regs *regs)
177 {
178 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL, NULL);
179 }
180
181 asmlinkage int m68k_clone(struct pt_regs *regs)
182 {
183 unsigned long clone_flags;
184 unsigned long newsp;
185
186 /* syscall2 puts clone_flags in d1 and usp in d2 */
187 clone_flags = regs->d1;
188 newsp = regs->d2;
189 if (!newsp)
190 newsp = rdusp();
191 return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
192 }
193
194 int copy_thread(int nr, 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 struct switch_stack * childstack, *stack;
200 unsigned long stack_offset, *retp;
201
202 stack_offset = THREAD_SIZE - sizeof(struct pt_regs);
203 childregs = (struct pt_regs *) ((unsigned long) p->thread_info + stack_offset);
204
205 *childregs = *regs;
206 childregs->d0 = 0;
207
208 retp = ((unsigned long *) regs);
209 stack = ((struct switch_stack *) retp) - 1;
210
211 childstack = ((struct switch_stack *) childregs) - 1;
212 *childstack = *stack;
213 childstack->retpc = (unsigned long)ret_from_fork;
214
215 p->thread.usp = usp;
216 p->thread.ksp = (unsigned long)childstack;
217 /*
218 * Must save the current SFC/DFC value, NOT the value when
219 * the parent was last descheduled - RGH 10-08-96
220 */
221 p->thread.fs = get_fs().seg;
222
223 #ifdef CONFIG_FPU
224 if (!FPU_IS_EMU) {
225 /* Copy the current fpu state */
226 asm volatile ("fsave %0" : : "m" (p->thread.fpstate[0]) : "memory");
227
228 if (p->thread.fpstate[0])
229 asm volatile ("fmovemx %/fp0-%/fp7,%0\n\t"
230 "fmoveml %/fpiar/%/fpcr/%/fpsr,%1"
231 : : "m" (p->thread.fp[0]), "m" (p->thread.fpcntl[0])
232 : "memory");
233 /* Restore the state in case the fpu was busy */
234 asm volatile ("frestore %0" : : "m" (p->thread.fpstate[0]));
235 }
236 #endif
237
238 return 0;
239 }
240
241 /* Fill in the fpu structure for a core dump. */
242
243 int dump_fpu(struct pt_regs *regs, struct user_m68kfp_struct *fpu)
244 {
245 #ifdef CONFIG_FPU
246 char fpustate[216];
247
248 if (FPU_IS_EMU) {
249 int i;
250
251 memcpy(fpu->fpcntl, current->thread.fpcntl, 12);
252 memcpy(fpu->fpregs, current->thread.fp, 96);
253 /* Convert internal fpu reg representation
254 * into long double format
255 */
256 for (i = 0; i < 24; i += 3)
257 fpu->fpregs[i] = ((fpu->fpregs[i] & 0xffff0000) << 15) |
258 ((fpu->fpregs[i] & 0x0000ffff) << 16);
259 return 1;
260 }
261
262 /* First dump the fpu context to avoid protocol violation. */
263 asm volatile ("fsave %0" :: "m" (fpustate[0]) : "memory");
264 if (!fpustate[0])
265 return 0;
266
267 asm volatile ("fmovem %/fpiar/%/fpcr/%/fpsr,%0"
268 :: "m" (fpu->fpcntl[0])
269 : "memory");
270 asm volatile ("fmovemx %/fp0-%/fp7,%0"
271 :: "m" (fpu->fpregs[0])
272 : "memory");
273 #endif
274 return 1;
275 }
276
277 /*
278 * fill in the user structure for a core dump..
279 */
280 void dump_thread(struct pt_regs * regs, struct user * dump)
281 {
282 struct switch_stack *sw;
283
284 /* changed the size calculations - should hopefully work better. lbt */
285 dump->magic = CMAGIC;
286 dump->start_code = 0;
287 dump->start_stack = rdusp() & ~(PAGE_SIZE - 1);
288 dump->u_tsize = ((unsigned long) current->mm->end_code) >> PAGE_SHIFT;
289 dump->u_dsize = ((unsigned long) (current->mm->brk +
290 (PAGE_SIZE-1))) >> PAGE_SHIFT;
291 dump->u_dsize -= dump->u_tsize;
292 dump->u_ssize = 0;
293
294 if (dump->start_stack < TASK_SIZE)
295 dump->u_ssize = ((unsigned long) (TASK_SIZE - dump->start_stack)) >> PAGE_SHIFT;
296
297 dump->u_ar0 = (struct user_regs_struct *)((int)&dump->regs - (int)dump);
298 sw = ((struct switch_stack *)regs) - 1;
299 dump->regs.d1 = regs->d1;
300 dump->regs.d2 = regs->d2;
301 dump->regs.d3 = regs->d3;
302 dump->regs.d4 = regs->d4;
303 dump->regs.d5 = regs->d5;
304 dump->regs.d6 = sw->d6;
305 dump->regs.d7 = sw->d7;
306 dump->regs.a0 = regs->a0;
307 dump->regs.a1 = regs->a1;
308 dump->regs.a2 = regs->a2;
309 dump->regs.a3 = sw->a3;
310 dump->regs.a4 = sw->a4;
311 dump->regs.a5 = sw->a5;
312 dump->regs.a6 = sw->a6;
313 dump->regs.d0 = regs->d0;
314 dump->regs.orig_d0 = regs->orig_d0;
315 dump->regs.stkadj = regs->stkadj;
316 dump->regs.sr = regs->sr;
317 dump->regs.pc = regs->pc;
318 dump->regs.fmtvec = (regs->format << 12) | regs->vector;
319 /* dump floating point stuff */
320 dump->u_fpvalid = dump_fpu (regs, &dump->m68kfp);
321 }
322
323 /*
324 * Generic dumping code. Used for panic and debug.
325 */
326 void dump(struct pt_regs *fp)
327 {
328 unsigned long *sp;
329 unsigned char *tp;
330 int i;
331
332 printk(KERN_EMERG "\nCURRENT PROCESS:\n\n");
333 printk(KERN_EMERG "COMM=%s PID=%d\n", current->comm, current->pid);
334
335 if (current->mm) {
336 printk(KERN_EMERG "TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
337 (int) current->mm->start_code,
338 (int) current->mm->end_code,
339 (int) current->mm->start_data,
340 (int) current->mm->end_data,
341 (int) current->mm->end_data,
342 (int) current->mm->brk);
343 printk(KERN_EMERG "USER-STACK=%08x KERNEL-STACK=%08x\n\n",
344 (int) current->mm->start_stack,
345 (int)(((unsigned long) current) + THREAD_SIZE));
346 }
347
348 printk(KERN_EMERG "PC: %08lx\n", fp->pc);
349 printk(KERN_EMERG "SR: %08lx SP: %08lx\n", (long) fp->sr, (long) fp);
350 printk(KERN_EMERG "d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
351 fp->d0, fp->d1, fp->d2, fp->d3);
352 printk(KERN_EMERG "d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
353 fp->d4, fp->d5, fp->a0, fp->a1);
354 printk(KERN_EMERG "\nUSP: %08x TRAPFRAME: %08x\n", (unsigned int) rdusp(),
355 (unsigned int) fp);
356
357 printk(KERN_EMERG "\nCODE:");
358 tp = ((unsigned char *) fp->pc) - 0x20;
359 for (sp = (unsigned long *) tp, i = 0; (i < 0x40); i += 4) {
360 if ((i % 0x10) == 0)
361 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
362 printk(KERN_EMERG "%08x ", (int) *sp++);
363 }
364 printk(KERN_EMERG "\n");
365
366 printk(KERN_EMERG "\nKERNEL STACK:");
367 tp = ((unsigned char *) fp) - 0x40;
368 for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
369 if ((i % 0x10) == 0)
370 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
371 printk(KERN_EMERG "%08x ", (int) *sp++);
372 }
373 printk(KERN_EMERG "\n");
374 printk(KERN_EMERG "\n");
375
376 printk(KERN_EMERG "\nUSER STACK:");
377 tp = (unsigned char *) (rdusp() - 0x10);
378 for (sp = (unsigned long *) tp, i = 0; (i < 0x80); i += 4) {
379 if ((i % 0x10) == 0)
380 printk(KERN_EMERG "\n%08x: ", (int) (tp + i));
381 printk(KERN_EMERG "%08x ", (int) *sp++);
382 }
383 printk(KERN_EMERG "\n\n");
384 }
385
386 /*
387 * sys_execve() executes a new program.
388 */
389 asmlinkage int sys_execve(char *name, char **argv, char **envp)
390 {
391 int error;
392 char * filename;
393 struct pt_regs *regs = (struct pt_regs *) &name;
394
395 lock_kernel();
396 filename = getname(name);
397 error = PTR_ERR(filename);
398 if (IS_ERR(filename))
399 goto out;
400 error = do_execve(filename, argv, envp, regs);
401 putname(filename);
402 out:
403 unlock_kernel();
404 return error;
405 }
406
407 unsigned long get_wchan(struct task_struct *p)
408 {
409 unsigned long fp, pc;
410 unsigned long stack_page;
411 int count = 0;
412 if (!p || p == current || p->state == TASK_RUNNING)
413 return 0;
414
415 stack_page = (unsigned long)p;
416 fp = ((struct switch_stack *)p->thread.ksp)->a6;
417 do {
418 if (fp < stack_page+sizeof(struct thread_info) ||
419 fp >= 8184+stack_page)
420 return 0;
421 pc = ((unsigned long *)fp)[1];
422 if (!in_sched_functions(pc))
423 return pc;
424 fp = *(unsigned long *) fp;
425 } while (count++ < 16);
426 return 0;
427 }
428
429 /*
430 * Return saved PC of a blocked thread.
431 */
432 unsigned long thread_saved_pc(struct task_struct *tsk)
433 {
434 struct switch_stack *sw = (struct switch_stack *)tsk->thread.ksp;
435
436 /* Check whether the thread is blocked in resume() */
437 if (in_sched_functions(sw->retpc))
438 return ((unsigned long *)sw->a6)[1];
439 else
440 return sw->retpc;
441 }
442
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