[ARM] pxa: update defconfig for Verdex Pro
[linux-2.6/verdex.git] / arch / sh / kernel / process_64.c
blob1192398ef582ad9e0b4fe7b5d41bdc61b76c4ca1
1 /*
2 * arch/sh/kernel/process_64.c
4 * This file handles the architecture-dependent parts of process handling..
6 * Copyright (C) 2000, 2001 Paolo Alberelli
7 * Copyright (C) 2003 - 2007 Paul Mundt
8 * Copyright (C) 2003, 2004 Richard Curnow
10 * Started from SH3/4 version:
11 * Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
13 * In turn started from i386 version:
14 * Copyright (C) 1995 Linus Torvalds
16 * This file is subject to the terms and conditions of the GNU General Public
17 * License. See the file "COPYING" in the main directory of this archive
18 * for more details.
20 #include <linux/mm.h>
21 #include <linux/fs.h>
22 #include <linux/ptrace.h>
23 #include <linux/reboot.h>
24 #include <linux/init.h>
25 #include <linux/module.h>
26 #include <linux/io.h>
27 #include <asm/syscalls.h>
28 #include <asm/uaccess.h>
29 #include <asm/pgtable.h>
30 #include <asm/mmu_context.h>
31 #include <asm/fpu.h>
33 struct task_struct *last_task_used_math = NULL;
35 void machine_restart(char * __unused)
37 extern void phys_stext(void);
39 phys_stext();
42 void machine_halt(void)
44 for (;;);
47 void machine_power_off(void)
49 __asm__ __volatile__ (
50 "sleep\n\t"
51 "synci\n\t"
52 "nop;nop;nop;nop\n\t"
55 panic("Unexpected wakeup!\n");
58 void show_regs(struct pt_regs * regs)
60 unsigned long long ah, al, bh, bl, ch, cl;
62 printk("\n");
64 ah = (regs->pc) >> 32;
65 al = (regs->pc) & 0xffffffff;
66 bh = (regs->regs[18]) >> 32;
67 bl = (regs->regs[18]) & 0xffffffff;
68 ch = (regs->regs[15]) >> 32;
69 cl = (regs->regs[15]) & 0xffffffff;
70 printk("PC : %08Lx%08Lx LINK: %08Lx%08Lx SP : %08Lx%08Lx\n",
71 ah, al, bh, bl, ch, cl);
73 ah = (regs->sr) >> 32;
74 al = (regs->sr) & 0xffffffff;
75 asm volatile ("getcon " __TEA ", %0" : "=r" (bh));
76 asm volatile ("getcon " __TEA ", %0" : "=r" (bl));
77 bh = (bh) >> 32;
78 bl = (bl) & 0xffffffff;
79 asm volatile ("getcon " __KCR0 ", %0" : "=r" (ch));
80 asm volatile ("getcon " __KCR0 ", %0" : "=r" (cl));
81 ch = (ch) >> 32;
82 cl = (cl) & 0xffffffff;
83 printk("SR : %08Lx%08Lx TEA : %08Lx%08Lx KCR0: %08Lx%08Lx\n",
84 ah, al, bh, bl, ch, cl);
86 ah = (regs->regs[0]) >> 32;
87 al = (regs->regs[0]) & 0xffffffff;
88 bh = (regs->regs[1]) >> 32;
89 bl = (regs->regs[1]) & 0xffffffff;
90 ch = (regs->regs[2]) >> 32;
91 cl = (regs->regs[2]) & 0xffffffff;
92 printk("R0 : %08Lx%08Lx R1 : %08Lx%08Lx R2 : %08Lx%08Lx\n",
93 ah, al, bh, bl, ch, cl);
95 ah = (regs->regs[3]) >> 32;
96 al = (regs->regs[3]) & 0xffffffff;
97 bh = (regs->regs[4]) >> 32;
98 bl = (regs->regs[4]) & 0xffffffff;
99 ch = (regs->regs[5]) >> 32;
100 cl = (regs->regs[5]) & 0xffffffff;
101 printk("R3 : %08Lx%08Lx R4 : %08Lx%08Lx R5 : %08Lx%08Lx\n",
102 ah, al, bh, bl, ch, cl);
104 ah = (regs->regs[6]) >> 32;
105 al = (regs->regs[6]) & 0xffffffff;
106 bh = (regs->regs[7]) >> 32;
107 bl = (regs->regs[7]) & 0xffffffff;
108 ch = (regs->regs[8]) >> 32;
109 cl = (regs->regs[8]) & 0xffffffff;
110 printk("R6 : %08Lx%08Lx R7 : %08Lx%08Lx R8 : %08Lx%08Lx\n",
111 ah, al, bh, bl, ch, cl);
113 ah = (regs->regs[9]) >> 32;
114 al = (regs->regs[9]) & 0xffffffff;
115 bh = (regs->regs[10]) >> 32;
116 bl = (regs->regs[10]) & 0xffffffff;
117 ch = (regs->regs[11]) >> 32;
118 cl = (regs->regs[11]) & 0xffffffff;
119 printk("R9 : %08Lx%08Lx R10 : %08Lx%08Lx R11 : %08Lx%08Lx\n",
120 ah, al, bh, bl, ch, cl);
122 ah = (regs->regs[12]) >> 32;
123 al = (regs->regs[12]) & 0xffffffff;
124 bh = (regs->regs[13]) >> 32;
125 bl = (regs->regs[13]) & 0xffffffff;
126 ch = (regs->regs[14]) >> 32;
127 cl = (regs->regs[14]) & 0xffffffff;
128 printk("R12 : %08Lx%08Lx R13 : %08Lx%08Lx R14 : %08Lx%08Lx\n",
129 ah, al, bh, bl, ch, cl);
131 ah = (regs->regs[16]) >> 32;
132 al = (regs->regs[16]) & 0xffffffff;
133 bh = (regs->regs[17]) >> 32;
134 bl = (regs->regs[17]) & 0xffffffff;
135 ch = (regs->regs[19]) >> 32;
136 cl = (regs->regs[19]) & 0xffffffff;
137 printk("R16 : %08Lx%08Lx R17 : %08Lx%08Lx R19 : %08Lx%08Lx\n",
138 ah, al, bh, bl, ch, cl);
140 ah = (regs->regs[20]) >> 32;
141 al = (regs->regs[20]) & 0xffffffff;
142 bh = (regs->regs[21]) >> 32;
143 bl = (regs->regs[21]) & 0xffffffff;
144 ch = (regs->regs[22]) >> 32;
145 cl = (regs->regs[22]) & 0xffffffff;
146 printk("R20 : %08Lx%08Lx R21 : %08Lx%08Lx R22 : %08Lx%08Lx\n",
147 ah, al, bh, bl, ch, cl);
149 ah = (regs->regs[23]) >> 32;
150 al = (regs->regs[23]) & 0xffffffff;
151 bh = (regs->regs[24]) >> 32;
152 bl = (regs->regs[24]) & 0xffffffff;
153 ch = (regs->regs[25]) >> 32;
154 cl = (regs->regs[25]) & 0xffffffff;
155 printk("R23 : %08Lx%08Lx R24 : %08Lx%08Lx R25 : %08Lx%08Lx\n",
156 ah, al, bh, bl, ch, cl);
158 ah = (regs->regs[26]) >> 32;
159 al = (regs->regs[26]) & 0xffffffff;
160 bh = (regs->regs[27]) >> 32;
161 bl = (regs->regs[27]) & 0xffffffff;
162 ch = (regs->regs[28]) >> 32;
163 cl = (regs->regs[28]) & 0xffffffff;
164 printk("R26 : %08Lx%08Lx R27 : %08Lx%08Lx R28 : %08Lx%08Lx\n",
165 ah, al, bh, bl, ch, cl);
167 ah = (regs->regs[29]) >> 32;
168 al = (regs->regs[29]) & 0xffffffff;
169 bh = (regs->regs[30]) >> 32;
170 bl = (regs->regs[30]) & 0xffffffff;
171 ch = (regs->regs[31]) >> 32;
172 cl = (regs->regs[31]) & 0xffffffff;
173 printk("R29 : %08Lx%08Lx R30 : %08Lx%08Lx R31 : %08Lx%08Lx\n",
174 ah, al, bh, bl, ch, cl);
176 ah = (regs->regs[32]) >> 32;
177 al = (regs->regs[32]) & 0xffffffff;
178 bh = (regs->regs[33]) >> 32;
179 bl = (regs->regs[33]) & 0xffffffff;
180 ch = (regs->regs[34]) >> 32;
181 cl = (regs->regs[34]) & 0xffffffff;
182 printk("R32 : %08Lx%08Lx R33 : %08Lx%08Lx R34 : %08Lx%08Lx\n",
183 ah, al, bh, bl, ch, cl);
185 ah = (regs->regs[35]) >> 32;
186 al = (regs->regs[35]) & 0xffffffff;
187 bh = (regs->regs[36]) >> 32;
188 bl = (regs->regs[36]) & 0xffffffff;
189 ch = (regs->regs[37]) >> 32;
190 cl = (regs->regs[37]) & 0xffffffff;
191 printk("R35 : %08Lx%08Lx R36 : %08Lx%08Lx R37 : %08Lx%08Lx\n",
192 ah, al, bh, bl, ch, cl);
194 ah = (regs->regs[38]) >> 32;
195 al = (regs->regs[38]) & 0xffffffff;
196 bh = (regs->regs[39]) >> 32;
197 bl = (regs->regs[39]) & 0xffffffff;
198 ch = (regs->regs[40]) >> 32;
199 cl = (regs->regs[40]) & 0xffffffff;
200 printk("R38 : %08Lx%08Lx R39 : %08Lx%08Lx R40 : %08Lx%08Lx\n",
201 ah, al, bh, bl, ch, cl);
203 ah = (regs->regs[41]) >> 32;
204 al = (regs->regs[41]) & 0xffffffff;
205 bh = (regs->regs[42]) >> 32;
206 bl = (regs->regs[42]) & 0xffffffff;
207 ch = (regs->regs[43]) >> 32;
208 cl = (regs->regs[43]) & 0xffffffff;
209 printk("R41 : %08Lx%08Lx R42 : %08Lx%08Lx R43 : %08Lx%08Lx\n",
210 ah, al, bh, bl, ch, cl);
212 ah = (regs->regs[44]) >> 32;
213 al = (regs->regs[44]) & 0xffffffff;
214 bh = (regs->regs[45]) >> 32;
215 bl = (regs->regs[45]) & 0xffffffff;
216 ch = (regs->regs[46]) >> 32;
217 cl = (regs->regs[46]) & 0xffffffff;
218 printk("R44 : %08Lx%08Lx R45 : %08Lx%08Lx R46 : %08Lx%08Lx\n",
219 ah, al, bh, bl, ch, cl);
221 ah = (regs->regs[47]) >> 32;
222 al = (regs->regs[47]) & 0xffffffff;
223 bh = (regs->regs[48]) >> 32;
224 bl = (regs->regs[48]) & 0xffffffff;
225 ch = (regs->regs[49]) >> 32;
226 cl = (regs->regs[49]) & 0xffffffff;
227 printk("R47 : %08Lx%08Lx R48 : %08Lx%08Lx R49 : %08Lx%08Lx\n",
228 ah, al, bh, bl, ch, cl);
230 ah = (regs->regs[50]) >> 32;
231 al = (regs->regs[50]) & 0xffffffff;
232 bh = (regs->regs[51]) >> 32;
233 bl = (regs->regs[51]) & 0xffffffff;
234 ch = (regs->regs[52]) >> 32;
235 cl = (regs->regs[52]) & 0xffffffff;
236 printk("R50 : %08Lx%08Lx R51 : %08Lx%08Lx R52 : %08Lx%08Lx\n",
237 ah, al, bh, bl, ch, cl);
239 ah = (regs->regs[53]) >> 32;
240 al = (regs->regs[53]) & 0xffffffff;
241 bh = (regs->regs[54]) >> 32;
242 bl = (regs->regs[54]) & 0xffffffff;
243 ch = (regs->regs[55]) >> 32;
244 cl = (regs->regs[55]) & 0xffffffff;
245 printk("R53 : %08Lx%08Lx R54 : %08Lx%08Lx R55 : %08Lx%08Lx\n",
246 ah, al, bh, bl, ch, cl);
248 ah = (regs->regs[56]) >> 32;
249 al = (regs->regs[56]) & 0xffffffff;
250 bh = (regs->regs[57]) >> 32;
251 bl = (regs->regs[57]) & 0xffffffff;
252 ch = (regs->regs[58]) >> 32;
253 cl = (regs->regs[58]) & 0xffffffff;
254 printk("R56 : %08Lx%08Lx R57 : %08Lx%08Lx R58 : %08Lx%08Lx\n",
255 ah, al, bh, bl, ch, cl);
257 ah = (regs->regs[59]) >> 32;
258 al = (regs->regs[59]) & 0xffffffff;
259 bh = (regs->regs[60]) >> 32;
260 bl = (regs->regs[60]) & 0xffffffff;
261 ch = (regs->regs[61]) >> 32;
262 cl = (regs->regs[61]) & 0xffffffff;
263 printk("R59 : %08Lx%08Lx R60 : %08Lx%08Lx R61 : %08Lx%08Lx\n",
264 ah, al, bh, bl, ch, cl);
266 ah = (regs->regs[62]) >> 32;
267 al = (regs->regs[62]) & 0xffffffff;
268 bh = (regs->tregs[0]) >> 32;
269 bl = (regs->tregs[0]) & 0xffffffff;
270 ch = (regs->tregs[1]) >> 32;
271 cl = (regs->tregs[1]) & 0xffffffff;
272 printk("R62 : %08Lx%08Lx T0 : %08Lx%08Lx T1 : %08Lx%08Lx\n",
273 ah, al, bh, bl, ch, cl);
275 ah = (regs->tregs[2]) >> 32;
276 al = (regs->tregs[2]) & 0xffffffff;
277 bh = (regs->tregs[3]) >> 32;
278 bl = (regs->tregs[3]) & 0xffffffff;
279 ch = (regs->tregs[4]) >> 32;
280 cl = (regs->tregs[4]) & 0xffffffff;
281 printk("T2 : %08Lx%08Lx T3 : %08Lx%08Lx T4 : %08Lx%08Lx\n",
282 ah, al, bh, bl, ch, cl);
284 ah = (regs->tregs[5]) >> 32;
285 al = (regs->tregs[5]) & 0xffffffff;
286 bh = (regs->tregs[6]) >> 32;
287 bl = (regs->tregs[6]) & 0xffffffff;
288 ch = (regs->tregs[7]) >> 32;
289 cl = (regs->tregs[7]) & 0xffffffff;
290 printk("T5 : %08Lx%08Lx T6 : %08Lx%08Lx T7 : %08Lx%08Lx\n",
291 ah, al, bh, bl, ch, cl);
294 * If we're in kernel mode, dump the stack too..
296 if (!user_mode(regs)) {
297 void show_stack(struct task_struct *tsk, unsigned long *sp);
298 unsigned long sp = regs->regs[15] & 0xffffffff;
299 struct task_struct *tsk = get_current();
301 tsk->thread.kregs = regs;
303 show_stack(tsk, (unsigned long *)sp);
308 * Create a kernel thread
310 ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
312 do_exit(fn(arg));
316 * This is the mechanism for creating a new kernel thread.
318 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
319 * who haven't done an "execve()") should use this: it will work within
320 * a system call from a "real" process, but the process memory space will
321 * not be freed until both the parent and the child have exited.
323 int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
325 struct pt_regs regs;
327 memset(&regs, 0, sizeof(regs));
328 regs.regs[2] = (unsigned long)arg;
329 regs.regs[3] = (unsigned long)fn;
331 regs.pc = (unsigned long)kernel_thread_helper;
332 regs.sr = (1 << 30);
334 /* Ok, create the new process.. */
335 return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
336 &regs, 0, NULL, NULL);
340 * Free current thread data structures etc..
342 void exit_thread(void)
345 * See arch/sparc/kernel/process.c for the precedent for doing
346 * this -- RPC.
348 * The SH-5 FPU save/restore approach relies on
349 * last_task_used_math pointing to a live task_struct. When
350 * another task tries to use the FPU for the 1st time, the FPUDIS
351 * trap handling (see arch/sh/kernel/cpu/sh5/fpu.c) will save the
352 * existing FPU state to the FP regs field within
353 * last_task_used_math before re-loading the new task's FPU state
354 * (or initialising it if the FPU has been used before). So if
355 * last_task_used_math is stale, and its page has already been
356 * re-allocated for another use, the consequences are rather
357 * grim. Unless we null it here, there is no other path through
358 * which it would get safely nulled.
360 #ifdef CONFIG_SH_FPU
361 if (last_task_used_math == current) {
362 last_task_used_math = NULL;
364 #endif
367 void flush_thread(void)
370 /* Called by fs/exec.c (flush_old_exec) to remove traces of a
371 * previously running executable. */
372 #ifdef CONFIG_SH_FPU
373 if (last_task_used_math == current) {
374 last_task_used_math = NULL;
376 /* Force FPU state to be reinitialised after exec */
377 clear_used_math();
378 #endif
380 /* if we are a kernel thread, about to change to user thread,
381 * update kreg
383 if(current->thread.kregs==&fake_swapper_regs) {
384 current->thread.kregs =
385 ((struct pt_regs *)(THREAD_SIZE + (unsigned long) current) - 1);
386 current->thread.uregs = current->thread.kregs;
390 void release_thread(struct task_struct *dead_task)
392 /* do nothing */
395 /* Fill in the fpu structure for a core dump.. */
396 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
398 #ifdef CONFIG_SH_FPU
399 int fpvalid;
400 struct task_struct *tsk = current;
402 fpvalid = !!tsk_used_math(tsk);
403 if (fpvalid) {
404 if (current == last_task_used_math) {
405 enable_fpu();
406 save_fpu(tsk, regs);
407 disable_fpu();
408 last_task_used_math = 0;
409 regs->sr |= SR_FD;
412 memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
415 return fpvalid;
416 #else
417 return 0; /* Task didn't use the fpu at all. */
418 #endif
421 asmlinkage void ret_from_fork(void);
423 int copy_thread(unsigned long clone_flags, unsigned long usp,
424 unsigned long unused,
425 struct task_struct *p, struct pt_regs *regs)
427 struct pt_regs *childregs;
429 #ifdef CONFIG_SH_FPU
430 if(last_task_used_math == current) {
431 enable_fpu();
432 save_fpu(current, regs);
433 disable_fpu();
434 last_task_used_math = NULL;
435 regs->sr |= SR_FD;
437 #endif
438 /* Copy from sh version */
439 childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
441 *childregs = *regs;
444 * Sign extend the edited stack.
445 * Note that thread.pc and thread.pc will stay
446 * 32-bit wide and context switch must take care
447 * of NEFF sign extension.
449 if (user_mode(regs)) {
450 childregs->regs[15] = neff_sign_extend(usp);
451 p->thread.uregs = childregs;
452 } else {
453 childregs->regs[15] =
454 neff_sign_extend((unsigned long)task_stack_page(p) +
455 THREAD_SIZE);
458 childregs->regs[9] = 0; /* Set return value for child */
459 childregs->sr |= SR_FD; /* Invalidate FPU flag */
461 p->thread.sp = (unsigned long) childregs;
462 p->thread.pc = (unsigned long) ret_from_fork;
464 return 0;
467 asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
468 unsigned long r4, unsigned long r5,
469 unsigned long r6, unsigned long r7,
470 struct pt_regs *pregs)
472 return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
475 asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
476 unsigned long r4, unsigned long r5,
477 unsigned long r6, unsigned long r7,
478 struct pt_regs *pregs)
480 if (!newsp)
481 newsp = pregs->regs[15];
482 return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
486 * This is trivial, and on the face of it looks like it
487 * could equally well be done in user mode.
489 * Not so, for quite unobvious reasons - register pressure.
490 * In user mode vfork() cannot have a stack frame, and if
491 * done by calling the "clone()" system call directly, you
492 * do not have enough call-clobbered registers to hold all
493 * the information you need.
495 asmlinkage int sys_vfork(unsigned long r2, unsigned long r3,
496 unsigned long r4, unsigned long r5,
497 unsigned long r6, unsigned long r7,
498 struct pt_regs *pregs)
500 return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
504 * sys_execve() executes a new program.
506 asmlinkage int sys_execve(char *ufilename, char **uargv,
507 char **uenvp, unsigned long r5,
508 unsigned long r6, unsigned long r7,
509 struct pt_regs *pregs)
511 int error;
512 char *filename;
514 filename = getname((char __user *)ufilename);
515 error = PTR_ERR(filename);
516 if (IS_ERR(filename))
517 goto out;
519 error = do_execve(filename,
520 (char __user * __user *)uargv,
521 (char __user * __user *)uenvp,
522 pregs);
523 putname(filename);
524 out:
525 return error;
529 * These bracket the sleeping functions..
531 extern void interruptible_sleep_on(wait_queue_head_t *q);
533 #define mid_sched ((unsigned long) interruptible_sleep_on)
535 #ifdef CONFIG_FRAME_POINTER
536 static int in_sh64_switch_to(unsigned long pc)
538 extern char __sh64_switch_to_end;
539 /* For a sleeping task, the PC is somewhere in the middle of the function,
540 so we don't have to worry about masking the LSB off */
541 return (pc >= (unsigned long) sh64_switch_to) &&
542 (pc < (unsigned long) &__sh64_switch_to_end);
544 #endif
546 unsigned long get_wchan(struct task_struct *p)
548 unsigned long pc;
550 if (!p || p == current || p->state == TASK_RUNNING)
551 return 0;
554 * The same comment as on the Alpha applies here, too ...
556 pc = thread_saved_pc(p);
558 #ifdef CONFIG_FRAME_POINTER
559 if (in_sh64_switch_to(pc)) {
560 unsigned long schedule_fp;
561 unsigned long sh64_switch_to_fp;
562 unsigned long schedule_caller_pc;
564 sh64_switch_to_fp = (long) p->thread.sp;
565 /* r14 is saved at offset 4 in the sh64_switch_to frame */
566 schedule_fp = *(unsigned long *) (long)(sh64_switch_to_fp + 4);
568 /* and the caller of 'schedule' is (currently!) saved at offset 24
569 in the frame of schedule (from disasm) */
570 schedule_caller_pc = *(unsigned long *) (long)(schedule_fp + 24);
571 return schedule_caller_pc;
573 #endif
574 return pc;